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Rev | Author | Line No. | Line |
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6617 | IgorA | 1 | ; deflate.asm -- compress data using the deflation algorithm |
2 | ; Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler |
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3 | ; For conditions of distribution and use, see copyright notice in zlib.inc |
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4 | |||
5 | ; ALGORITHM |
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6 | |||
7 | ; The "deflation" process depends on being able to identify portions |
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8 | ; of the input text which are identical to earlier input (within a |
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9 | ; sliding window trailing behind the input currently being processed). |
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10 | |||
11 | ; The most straightforward technique turns out to be the fastest for |
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12 | ; most input files: try all possible matches and select the longest. |
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13 | ; The key feature of this algorithm is that insertions into the string |
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14 | ; dictionary are very simple and thus fast, and deletions are avoided |
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15 | ; completely. Insertions are performed at each input character, whereas |
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16 | ; string matches are performed only when the previous match ends. So it |
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17 | ; is preferable to spend more time in matches to allow very fast string |
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18 | ; insertions and avoid deletions. The matching algorithm for small |
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19 | ; strings is inspired from that of Rabin & Karp. A brute force approach |
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20 | ; is used to find longer strings when a small match has been found. |
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21 | ; A similar algorithm is used in comic (by Jan-Mark Wams) and freeze |
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22 | ; (by Leonid Broukhis). |
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23 | ; A previous version of this file used a more sophisticated algorithm |
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24 | ; (by Fiala and Greene) which is guaranteed to run in linear amortized |
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25 | ; time, but has a larger average cost, uses more memory and is patented. |
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26 | ; However the F&G algorithm may be faster for some highly redundant |
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27 | ; files if the parameter max_chain_length (described below) is too large. |
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28 | |||
29 | ; ACKNOWLEDGEMENTS |
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30 | |||
31 | ; The idea of lazy evaluation of matches is due to Jan-Mark Wams, and |
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32 | ; I found it in 'freeze' written by Leonid Broukhis. |
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33 | ; Thanks to many people for bug reports and testing. |
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34 | |||
35 | ; REFERENCES |
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36 | |||
37 | ; Deutsch, L.P.,"DEFLATE Compressed Data Format Specification". |
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38 | ; Available in http://tools.ietf.org/html/rfc1951 |
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39 | |||
40 | ; A description of the Rabin and Karp algorithm is given in the book |
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41 | ; "Algorithms" by R. Sedgewick, Addison-Wesley, p252. |
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42 | |||
43 | ; Fiala,E.R., and Greene,D.H. |
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44 | ; Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595 |
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45 | |||
46 | |||
47 | deflate_copyright db ' deflate 1.2.8 Copyright 1995-2013 Jean-loup Gailly and Mark Adler ',0 |
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48 | |||
49 | ; If you use the zlib library in a product, an acknowledgment is welcome |
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50 | ; in the documentation of your product. If for some reason you cannot |
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51 | ; include such an acknowledgment, I would appreciate that you keep this |
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52 | ; copyright string in the executable of your product. |
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53 | |||
54 | ; =========================================================================== |
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55 | ; Function prototypes. |
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56 | |||
57 | ;enum block_state |
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58 | need_more equ 1 ;block not completed, need more input or more output |
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59 | block_done equ 2 ;block flush performed |
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60 | finish_started equ 3 ;finish started, need only more output at next deflate |
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61 | finish_done equ 4 ;finish done, accept no more input or output |
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62 | |||
63 | ; =========================================================================== |
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64 | ; Local data |
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65 | |||
66 | NIL equ 0 |
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67 | ; Tail of hash chains |
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68 | |||
69 | TOO_FAR equ 4096 |
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70 | ; Matches of length 3 are discarded if their distance exceeds TOO_FAR |
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71 | |||
72 | ; Values for max_lazy_match, good_match and max_chain_length, depending on |
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73 | ; the desired pack level (0..9). The values given below have been tuned to |
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74 | ; exclude worst case performance for pathological files. Better values may be |
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75 | ; found for specific files. |
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76 | |||
77 | struct config_s ;config |
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78 | good_length dw ? ;uint_16 ;reduce lazy search above this match length |
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79 | max_lazy dw ? ;uint_16 ;do not perform lazy search above this match length |
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80 | nice_length dw ? ;uint_16 ;quit search above this match length |
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81 | max_chain dw ? ;uint_16 |
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82 | co_func dd ? ;compress_func |
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83 | ends |
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84 | |||
85 | align 16 |
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86 | configuration_table: |
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87 | config_s 0, 0, 0, 0, deflate_stored ;store only |
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88 | config_s 4, 4, 8, 4, deflate_fast ;max speed, no lazy matches |
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89 | if FASTEST eq 0 |
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90 | config_s 4, 5, 16, 8, deflate_fast |
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91 | config_s 4, 6, 32, 32, deflate_fast |
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92 | config_s 4, 4, 16, 16, deflate_slow ;lazy matches |
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93 | config_s 8, 16, 32, 32, deflate_slow |
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94 | config_s 8, 16, 128, 128, deflate_slow |
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95 | config_s 8, 32, 128, 256, deflate_slow |
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96 | config_s 32, 128, 258, 1024, deflate_slow |
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97 | config_s 32, 258, 258, 4096, deflate_slow ;max compression |
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98 | end if |
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99 | |||
100 | ; Note: the deflate() code requires max_lazy >= MIN_MATCH and max_chain >= 4 |
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101 | ; For deflate_fast() (levels <= 3) good is ignored and lazy has a different |
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102 | ; meaning. |
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103 | |||
104 | |||
105 | EQUAL equ 0 |
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106 | ; result of memcmp for equal strings |
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107 | |||
108 | ; rank Z_BLOCK between Z_NO_FLUSH and Z_PARTIAL_FLUSH |
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109 | macro RANK f, reg |
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110 | { |
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111 | local .end0 |
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112 | xor reg,reg |
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113 | cmp f,4 |
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114 | jle .end0 |
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115 | sub reg,9 |
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116 | .end0: |
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117 | add reg,f |
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118 | add reg,f |
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119 | } |
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120 | |||
121 | ; =========================================================================== |
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122 | ; Update a hash value with the given input byte |
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123 | ; IN assertion: all calls to to UPDATE_HASH are made with consecutive |
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124 | ; input characters, so that a running hash key can be computed from the |
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125 | ; previous key instead of complete recalculation each time. |
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126 | |||
127 | macro UPDATE_HASH s,h,c |
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128 | { |
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129 | push ebx ecx |
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130 | mov ebx,h |
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131 | mov ecx,[s+deflate_state.hash_shift] |
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132 | shl ebx,cl |
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133 | xor ebx,c |
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134 | and ebx,[s+deflate_state.hash_mask] |
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135 | mov h,ebx |
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136 | pop ecx ebx |
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137 | } |
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138 | |||
139 | ; =========================================================================== |
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140 | ; Insert string str in the dictionary and set match_head to the previous head |
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141 | ; of the hash chain (the most recent string with same hash key). Return |
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142 | ; the previous length of the hash chain. |
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143 | ; If this file is compiled with -DFASTEST, the compression level is forced |
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144 | ; to 1, and no hash chains are maintained. |
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145 | ; IN assertion: all calls to to INSERT_STRING are made with consecutive |
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146 | ; input characters and the first MIN_MATCH bytes of str are valid |
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147 | ; (except for the last MIN_MATCH-1 bytes of the input file). |
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148 | |||
149 | macro INSERT_STRING s, str, match_head |
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150 | { |
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151 | mov eax,[s+deflate_state.window] |
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152 | add eax,str |
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153 | add eax,MIN_MATCH-1 |
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154 | movzx eax,byte[eax] |
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155 | UPDATE_HASH s, [s+deflate_state.ins_h], eax |
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156 | mov eax,[s+deflate_state.ins_h] |
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157 | shl eax,2 |
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158 | add eax,[s+deflate_state.head] |
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159 | mov eax,[eax] |
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160 | mov match_head,eax |
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161 | if FASTEST eq 0 |
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162 | push ebx |
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163 | mov ebx,[s+deflate_state.w_mask] |
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164 | and ebx,str |
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6799 | IgorA | 165 | shl ebx,2 |
6617 | IgorA | 166 | add ebx,[s+deflate_state.prev] |
6799 | IgorA | 167 | mov [ebx],eax |
6617 | IgorA | 168 | pop ebx |
169 | end if |
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170 | mov eax,[s+deflate_state.ins_h] |
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171 | shl eax,2 |
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172 | add eax,[s+deflate_state.head] |
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173 | push str |
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174 | pop dword[eax] |
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175 | } |
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176 | |||
177 | ; =========================================================================== |
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178 | ; Initialize the hash table (avoiding 64K overflow for 16 bit systems). |
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179 | ; prev[] will be initialized on the fly. |
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180 | |||
181 | macro CLEAR_HASH s |
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182 | { |
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6799 | IgorA | 183 | ;mov eax,[s+deflate_state.hash_size] |
184 | ;dec eax |
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185 | ;shl eax,2 |
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186 | ;add eax,[s+deflate_state.head] |
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187 | ;mov dword[eax],NIL |
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6617 | IgorA | 188 | mov eax,[s+deflate_state.hash_size] |
6799 | IgorA | 189 | ;dec eax |
6617 | IgorA | 190 | shl eax,2 ;sizeof(*s.head) |
191 | stdcall zmemzero, [s+deflate_state.head], eax |
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192 | } |
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193 | |||
194 | align 4 |
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195 | proc deflateInit, strm:dword, level:dword |
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196 | stdcall deflateInit_, [strm], [level], ZLIB_VERSION, sizeof.z_stream |
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197 | ret |
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198 | endp |
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199 | |||
200 | ; ========================================================================= |
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201 | ;int (strm, level, version, stream_size) |
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6639 | IgorA | 202 | ; z_streamp strm |
203 | ; int level |
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204 | ; const char *version |
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205 | ; int stream_size |
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6617 | IgorA | 206 | align 4 |
207 | proc deflateInit_, strm:dword, level:dword, version:dword, stream_size:dword |
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208 | stdcall deflateInit2_, [strm], [level], Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL,\ |
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209 | Z_DEFAULT_STRATEGY, [version], [stream_size] |
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210 | ; To do: ignore strm->next_in if we use it as window |
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211 | ret |
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212 | endp |
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213 | |||
214 | align 4 |
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215 | proc deflateInit2, strm:dword, level:dword, method:dword, windowBits:dword, memLevel:dword, strategy:dword |
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216 | stdcall deflateInit2_, [strm],[level],[method],[windowBits],[memLevel],\ |
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217 | [strategy], ZLIB_VERSION, sizeof.z_stream |
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218 | ret |
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219 | endp |
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220 | |||
221 | ; ========================================================================= |
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222 | ;int (strm, level, method, windowBits, memLevel, strategy, |
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223 | ; version, stream_size) |
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6639 | IgorA | 224 | ; z_streamp strm |
225 | ; int level |
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226 | ; int method |
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227 | ; int windowBits |
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228 | ; int memLevel |
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229 | ; int strategy |
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230 | ; const char *version |
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231 | ; int stream_size |
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6617 | IgorA | 232 | align 4 |
233 | proc deflateInit2_ uses ebx ecx edx edi, strm:dword, level:dword, method:dword,\ |
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234 | windowBits:dword, memLevel:dword, strategy:dword, version:dword, stream_size:dword |
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235 | locals |
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236 | wrap dd 1 ;int |
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237 | overlay dd ? ;uint_16p |
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238 | endl |
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239 | ; We overlay pending_buf and d_buf+l_buf. This works since the average |
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240 | ; output size for (length,distance) codes is <= 24 bits. |
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241 | |||
242 | mov eax,[version] |
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243 | cmp eax,Z_NULL |
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244 | je @f |
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245 | mov ebx,dword[ZLIB_VERSION] |
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246 | cmp dword[eax],ebx |
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247 | jne @f |
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248 | cmp dword[stream_size],sizeof.z_stream |
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249 | je .end0 |
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250 | @@: ;if (..==0 || ..[0]!=..[0] || ..!=..) |
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251 | mov eax,Z_VERSION_ERROR |
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252 | jmp .end_f |
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253 | .end0: |
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254 | mov ebx,[strm] |
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255 | cmp ebx,Z_NULL |
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256 | jne @f ;if (..==0) return .. |
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257 | mov eax,Z_STREAM_ERROR |
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258 | jmp .end_f |
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259 | @@: |
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260 | |||
261 | mov dword[ebx+z_stream.msg],Z_NULL |
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262 | cmp dword[ebx+z_stream.zalloc],0 |
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263 | jne @f ;if (..==0) |
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264 | if Z_SOLO eq 1 |
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265 | mov eax,Z_STREAM_ERROR |
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266 | jmp .end_f |
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267 | else |
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268 | mov dword[ebx+z_stream.zalloc],zcalloc |
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269 | mov dword[ebx+z_stream.opaque],0 |
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270 | end if |
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271 | @@: |
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272 | cmp dword[ebx+z_stream.zfree],0 |
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273 | jne @f ;if (..==0) |
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274 | if Z_SOLO eq 1 |
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275 | mov eax,Z_STREAM_ERROR |
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276 | jmp .end_f |
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277 | else |
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278 | mov dword[ebx+z_stream.zfree],zcfree |
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279 | end if |
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280 | @@: |
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281 | |||
282 | if FASTEST eq 1 |
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283 | cmp dword[level],0 |
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284 | je @f ;if (..!=0) |
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285 | mov dword[level],1 |
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286 | @@: |
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287 | else |
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288 | cmp dword[level],Z_DEFAULT_COMPRESSION |
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289 | jne @f ;if (..==0) |
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290 | mov dword[level],6 |
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291 | @@: |
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292 | end if |
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293 | |||
294 | cmp dword[windowBits],0 |
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295 | jge @f ;if (..<0) ;suppress zlib wrapper |
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296 | mov dword[wrap],0 |
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297 | neg dword[windowBits] |
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298 | inc dword[windowBits] |
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299 | jmp .end1 |
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300 | @@: |
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301 | if GZIP eq 1 |
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302 | cmp dword[windowBits],15 |
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303 | jle .end1 ;else if (..>15) |
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304 | mov dword[wrap],2 ;write gzip wrapper instead |
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305 | sub dword[windowBits],16 |
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306 | end if |
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307 | .end1: |
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308 | cmp dword[memLevel],1 |
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309 | jl .end2 |
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310 | cmp dword[memLevel],MAX_MEM_LEVEL |
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311 | jg .end2 |
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312 | cmp dword[method],Z_DEFLATED |
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313 | jne .end2 |
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314 | cmp dword[windowBits],8 |
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315 | jl .end2 |
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316 | cmp dword[windowBits],15 |
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317 | jg .end2 |
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318 | cmp dword[level],0 |
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319 | jl .end2 |
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320 | cmp dword[level],9 |
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321 | jg .end2 |
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322 | cmp dword[strategy],0 |
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323 | jl .end2 |
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324 | cmp dword[strategy],Z_FIXED |
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325 | jle @f |
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326 | .end2: ;if (..<.. || ..>.. || ..!=.. || ..<.. || ..>.. || ..<0 || ..>.. || ..<0 || ..>..) |
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327 | mov eax,Z_STREAM_ERROR |
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328 | jmp .end_f |
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329 | @@: |
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330 | cmp dword[windowBits],8 |
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331 | jne @f ;if (..==..) |
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332 | inc dword[windowBits] ;until 256-byte window bug fixed |
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333 | @@: |
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334 | ZALLOC ebx, 1, sizeof.deflate_state |
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335 | ;eax = s |
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336 | cmp eax,Z_NULL |
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337 | jne @f ;if (..==0) |
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338 | mov eax,Z_MEM_ERROR |
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339 | jmp .end_f |
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340 | @@: |
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341 | mov edi,eax ;edi = s |
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342 | mov [ebx+z_stream.state],edi |
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343 | mov [edi+deflate_state.strm],ebx |
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344 | |||
345 | mov eax,[wrap] |
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346 | mov [edi+deflate_state.wrap],eax |
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347 | mov [edi+deflate_state.gzhead],Z_NULL |
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348 | mov ecx,[windowBits] |
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349 | mov [edi+deflate_state.w_bits],ecx |
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350 | xor eax,eax |
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351 | inc eax |
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352 | shl eax,cl |
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353 | mov [edi+deflate_state.w_size],eax |
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354 | dec eax |
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355 | mov [edi+deflate_state.w_mask],eax |
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356 | |||
357 | mov ecx,[memLevel] |
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358 | add ecx,7 |
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359 | mov [edi+deflate_state.hash_bits],ecx |
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360 | xor eax,eax |
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361 | inc eax |
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362 | shl eax,cl |
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363 | mov [edi+deflate_state.hash_size],eax |
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364 | dec eax |
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365 | mov [edi+deflate_state.hash_mask],eax |
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366 | add ecx,MIN_MATCH-1 |
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367 | xor edx,edx |
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368 | mov eax,ecx |
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369 | mov ecx,MIN_MATCH |
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370 | div ecx |
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371 | mov [edi+deflate_state.hash_shift],eax |
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372 | |||
373 | ZALLOC ebx, [edi+deflate_state.w_size], 2 ;2*sizeof(Byte) |
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374 | mov [edi+deflate_state.window],eax |
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375 | ZALLOC ebx, [edi+deflate_state.w_size], 4 ;sizeof(Pos) |
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376 | mov [edi+deflate_state.prev],eax |
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377 | ZALLOC ebx, [edi+deflate_state.hash_size], 4 ;sizeof(Pos) |
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378 | mov [edi+deflate_state.head],eax |
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379 | |||
380 | mov dword[edi+deflate_state.high_water],0 ;nothing written to s->window yet |
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381 | |||
382 | mov ecx,[memLevel] |
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383 | add ecx,6 |
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384 | xor eax,eax |
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385 | inc eax |
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386 | shl eax,cl |
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387 | mov [edi+deflate_state.lit_bufsize],eax ;16K elements by default |
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388 | |||
389 | ZALLOC ebx, eax, 4 ;sizeof(uint_16)+2 |
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390 | mov [overlay],eax |
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391 | mov [edi+deflate_state.pending_buf],eax |
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392 | mov eax,[edi+deflate_state.lit_bufsize] |
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393 | imul eax,4 ;sizeof(uint_16)+2 |
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394 | mov [edi+deflate_state.pending_buf_size],eax |
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395 | |||
396 | cmp dword[edi+deflate_state.window],Z_NULL |
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397 | je .end3 |
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398 | cmp dword[edi+deflate_state.prev],Z_NULL |
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399 | je .end3 |
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400 | cmp dword[edi+deflate_state.head],Z_NULL |
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401 | je .end3 |
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402 | cmp dword[edi+deflate_state.pending_buf],Z_NULL |
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403 | je .end3 |
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404 | jmp @f |
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405 | .end3: ;if (..==0 || ..==0 || ..==0 || ..==0) |
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406 | mov dword[edi+deflate_state.status],FINISH_STATE |
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407 | ERR_MSG Z_MEM_ERROR |
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408 | mov [ebx+z_stream.msg],eax |
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409 | stdcall deflateEnd, ebx |
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410 | mov eax,Z_MEM_ERROR |
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411 | jmp .end_f |
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412 | @@: |
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413 | mov eax,[edi+deflate_state.lit_bufsize] |
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414 | shr eax,1 ;/=sizeof(uint_16) |
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415 | add eax,[overlay] |
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416 | mov [edi+deflate_state.d_buf],eax |
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417 | mov eax,[edi+deflate_state.lit_bufsize] |
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418 | imul eax,3 ;1+sizeof(uint_16) |
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419 | add eax,[edi+deflate_state.pending_buf] |
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420 | mov [edi+deflate_state.l_buf],eax |
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421 | |||
422 | mov eax,[level] |
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423 | mov [edi+deflate_state.level],ax |
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424 | mov eax,[strategy] |
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425 | mov [edi+deflate_state.strategy],ax |
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426 | mov eax,[method] |
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427 | mov [edi+deflate_state.method],al |
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428 | |||
429 | stdcall deflateReset, ebx |
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430 | .end_f: |
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431 | zlib_debug 'deflateInit2_ strategy = %d',[strategy] |
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432 | ret |
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433 | endp |
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434 | |||
435 | ; ========================================================================= |
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436 | ;int (strm, dictionary, dictLength) |
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6639 | IgorA | 437 | ; z_streamp strm |
438 | ; const Bytef *dictionary |
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439 | ; uInt dictLength |
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6617 | IgorA | 440 | align 4 |
441 | proc deflateSetDictionary uses ebx edi, strm:dword, dictionary:dword, dictLength:dword |
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442 | locals |
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443 | ; uInt str, n; |
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6797 | IgorA | 444 | wrap dd ? ;int |
6617 | IgorA | 445 | avail dd ? ;unsigned |
6797 | IgorA | 446 | next dd ? ;unsigned char* |
6617 | IgorA | 447 | endl |
448 | mov ebx,[strm] |
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449 | cmp ebx,Z_NULL |
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450 | je @f |
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451 | mov edi,[ebx+z_stream.state] |
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452 | cmp edi,Z_NULL |
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453 | je @f |
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454 | cmp dword[dictionary],Z_NULL |
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455 | je @f ;if (..==0 || ..==0 || ..==0) |
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456 | jmp .end0 |
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457 | @@: |
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458 | mov eax,Z_STREAM_ERROR |
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459 | jmp .end_f |
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460 | .end0: |
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461 | |||
462 | mov eax,[edi+deflate_state.wrap] |
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463 | mov [wrap],eax |
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6797 | IgorA | 464 | cmp dword[wrap],2 |
465 | je .end1 |
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466 | cmp dword[edi+deflate_state.lookahead],0 |
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467 | jne .end1 |
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468 | cmp dword[wrap],1 |
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469 | jne @f |
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470 | cmp dword[edi+deflate_state.status],INIT_STATE |
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471 | je @f |
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472 | .end1: ;if (..==.. || .. || (..==.. && ..!=..)) return .. |
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473 | mov eax,Z_STREAM_ERROR |
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474 | jmp .end_f |
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475 | @@: |
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6617 | IgorA | 476 | |
477 | ; when using zlib wrappers, compute Adler-32 for provided dictionary |
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6797 | IgorA | 478 | cmp dword[wrap],1 |
479 | jne @f ;if (..==..) |
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480 | stdcall adler32, [ebx+z_stream.adler], [dictionary], [dictLength] |
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481 | mov [ebx+z_stream.adler],eax |
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482 | @@: |
||
483 | mov dword[edi+deflate_state.wrap],0 ;avoid computing Adler-32 in read_buf |
||
6617 | IgorA | 484 | |
485 | ; if dictionary would fill window, just replace the history |
||
6797 | IgorA | 486 | mov eax,[edi+deflate_state.w_size] |
487 | cmp [dictLength],eax |
||
488 | jl .end2 ;if (..>=..) |
||
6617 | IgorA | 489 | ; if (wrap == 0) { /* already empty otherwise */ |
490 | ; CLEAR_HASH(s); |
||
491 | ; s->strstart = 0; |
||
492 | ; s->block_start = 0L; |
||
493 | ; s->insert = 0; |
||
494 | ; } |
||
495 | ; dictionary += dictLength - s->w_size; /* use the tail */ |
||
6797 | IgorA | 496 | mov eax,[edi+deflate_state.w_size] |
497 | mov [dictLength],eax |
||
498 | .end2: |
||
6617 | IgorA | 499 | |
500 | ; insert dictionary into window and hash |
||
501 | ; avail = strm->avail_in; |
||
502 | ; next = strm->next_in; |
||
503 | ; strm->avail_in = dictLength; |
||
504 | ; strm->next_in = (z_const Bytef *)dictionary; |
||
505 | ; fill_window(s); |
||
506 | ; while (s->lookahead >= MIN_MATCH) { |
||
507 | ; str = s->strstart; |
||
508 | ; n = s->lookahead - (MIN_MATCH-1); |
||
509 | ; do { |
||
510 | ; UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); |
||
511 | if FASTEST eq 0 |
||
512 | ; s->prev[str & s->w_mask] = s->head[s->ins_h]; |
||
513 | end if |
||
514 | ; s->head[s->ins_h] = (Pos)str; |
||
515 | ; str++; |
||
516 | ; } while (--n); |
||
517 | ; s->strstart = str; |
||
518 | ; s->lookahead = MIN_MATCH-1; |
||
519 | ; fill_window(s); |
||
520 | ; } |
||
521 | ; s->strstart += s->lookahead; |
||
522 | ; s->block_start = (long)s->strstart; |
||
6797 | IgorA | 523 | mov eax,[edi+deflate_state.lookahead] |
524 | mov [edi+deflate_state.insert],eax |
||
525 | mov dword[edi+deflate_state.lookahead],0 |
||
526 | mov eax,MIN_MATCH-1 |
||
527 | mov [edi+deflate_state.prev_length],eax |
||
528 | mov [edi+deflate_state.match_length],eax |
||
529 | mov dword[edi+deflate_state.match_available],0 |
||
530 | mov eax,[next] |
||
531 | mov [ebx+z_stream.next_in],eax |
||
532 | mov eax,[avail] |
||
533 | mov [ebx+z_stream.avail_in],eax |
||
534 | mov eax,[wrap] |
||
535 | mov [edi+deflate_state.wrap],eax |
||
6617 | IgorA | 536 | mov eax,Z_OK |
537 | .end_f: |
||
538 | ret |
||
539 | endp |
||
540 | |||
541 | ; ========================================================================= |
||
542 | ;int (strm) |
||
6639 | IgorA | 543 | ; z_streamp strm |
6617 | IgorA | 544 | align 4 |
545 | proc deflateResetKeep uses ebx edi, strm:dword |
||
546 | mov ebx,[strm] |
||
547 | cmp ebx,Z_NULL |
||
548 | je @f |
||
549 | mov edi,[ebx+z_stream.state] |
||
550 | cmp edi,Z_NULL |
||
551 | je @f |
||
552 | cmp dword[ebx+z_stream.zalloc],0 |
||
553 | je @f |
||
554 | cmp dword[ebx+z_stream.zfree],0 |
||
555 | je @f ;if (..==0 || ..==0 || ..==0 || ..==0) |
||
556 | jmp .end0 |
||
557 | @@: |
||
558 | mov eax,Z_STREAM_ERROR |
||
559 | jmp .end_f |
||
560 | .end0: |
||
561 | |||
562 | mov dword[ebx+z_stream.total_out],0 |
||
563 | mov dword[ebx+z_stream.total_in],0 |
||
564 | mov dword[ebx+z_stream.msg],Z_NULL ;use zfree if we ever allocate msg dynamically |
||
6797 | IgorA | 565 | mov dword[ebx+z_stream.data_type],Z_UNKNOWN |
6617 | IgorA | 566 | |
6741 | IgorA | 567 | mov dword[edi+deflate_state.pending],0 |
6617 | IgorA | 568 | mov eax,[edi+deflate_state.pending_buf] |
569 | mov [edi+deflate_state.pending_out],eax |
||
570 | |||
571 | cmp dword[edi+deflate_state.wrap],0 |
||
572 | jge @f ;if (..<0) |
||
573 | neg dword[edi+deflate_state.wrap] |
||
574 | inc dword[edi+deflate_state.wrap] ;was made negative by deflate(..., Z_FINISH) |
||
575 | @@: |
||
576 | mov eax,BUSY_STATE |
||
577 | cmp dword[edi+deflate_state.wrap],0 |
||
578 | je @f |
||
579 | mov eax,INIT_STATE |
||
580 | @@: |
||
581 | mov dword[edi+deflate_state.status],eax |
||
582 | stdcall adler32, 0, Z_NULL, 0 |
||
583 | if GZIP eq 1 |
||
584 | cmp dword[edi+deflate_state.wrap],2 |
||
585 | jne @f |
||
6639 | IgorA | 586 | xor eax,eax ;stdcall calc_crc32, 0, Z_NULL, 0 |
6617 | IgorA | 587 | @@: |
588 | end if |
||
589 | mov dword[ebx+z_stream.adler],eax |
||
590 | mov dword[edi+deflate_state.last_flush],Z_NO_FLUSH |
||
591 | stdcall _tr_init, edi |
||
592 | |||
593 | mov eax,Z_OK |
||
594 | .end_f: |
||
595 | ret |
||
596 | endp |
||
597 | |||
598 | ; ========================================================================= |
||
599 | ;int (strm) |
||
6639 | IgorA | 600 | ; z_streamp strm |
6617 | IgorA | 601 | align 4 |
602 | proc deflateReset uses ebx, strm:dword |
||
603 | mov ebx,[strm] |
||
6639 | IgorA | 604 | zlib_debug 'deflateReset' |
6617 | IgorA | 605 | stdcall deflateResetKeep, ebx |
6797 | IgorA | 606 | cmp eax,Z_OK |
6617 | IgorA | 607 | jne @f ;if (..==Z_OK) |
608 | stdcall lm_init, [ebx+z_stream.state] |
||
609 | @@: |
||
610 | ret |
||
611 | endp |
||
612 | |||
613 | ; ========================================================================= |
||
614 | ;int (strm, head) |
||
6639 | IgorA | 615 | ; z_streamp strm |
616 | ; gz_headerp head |
||
6617 | IgorA | 617 | align 4 |
618 | proc deflateSetHeader uses ebx, strm:dword, head:dword |
||
619 | mov ebx,[strm] |
||
620 | cmp ebx,Z_NULL |
||
621 | je @f |
||
622 | mov ebx,[ebx+z_stream.state] |
||
623 | cmp ebx,Z_NULL |
||
624 | jne .end0 |
||
625 | @@: ;if (..==0 || ..==0) return .. |
||
626 | mov eax,Z_STREAM_ERROR |
||
627 | jmp .end_f |
||
628 | .end0: |
||
629 | cmp dword[ebx+deflate_state.wrap],2 |
||
630 | je @f ;if (..!=..) return .. |
||
631 | mov eax,Z_STREAM_ERROR |
||
632 | jmp .end_f |
||
633 | @@: |
||
634 | mov eax,[head] |
||
635 | mov [ebx+deflate_state.gzhead],eax |
||
636 | mov eax,Z_OK |
||
637 | .end_f: |
||
638 | ret |
||
639 | endp |
||
640 | |||
641 | ; ========================================================================= |
||
642 | ;int (strm, pending, bits) |
||
6639 | IgorA | 643 | ; unsigned *pending |
644 | ; int *bits |
||
645 | ; z_streamp strm |
||
6617 | IgorA | 646 | align 4 |
647 | proc deflatePending uses ebx edi, strm:dword, pending:dword, bits:dword |
||
648 | mov ebx,[strm] |
||
649 | cmp ebx,Z_NULL |
||
650 | je @f |
||
651 | mov edi,[ebx+z_stream.state] |
||
652 | cmp edi,Z_NULL |
||
653 | jne .end0 |
||
654 | @@: ;if (..==0 || ..==0) return .. |
||
655 | mov eax,Z_STREAM_ERROR |
||
656 | jmp .end_f |
||
657 | .end0: |
||
658 | cmp dword[pending],Z_NULL |
||
659 | je @f ;if (..!=..) |
||
660 | mov eax,[pending] |
||
6741 | IgorA | 661 | mov ebx,[edi+deflate_state.pending] |
6617 | IgorA | 662 | mov [eax],ebx |
663 | @@: |
||
664 | cmp dword[bits],Z_NULL |
||
665 | je @f ;if (..!=..) |
||
666 | mov eax,[bits] |
||
667 | mov ebx,[edi+deflate_state.bi_valid] |
||
668 | mov [eax],ebx |
||
669 | @@: |
||
670 | mov eax,Z_OK |
||
671 | .end_f: |
||
672 | ret |
||
673 | endp |
||
674 | |||
675 | ; ========================================================================= |
||
676 | ;int (strm, bits, value) |
||
6639 | IgorA | 677 | ; z_streamp strm |
678 | ; int bits |
||
679 | ; int value |
||
6617 | IgorA | 680 | align 4 |
681 | proc deflatePrime uses ebx edi, strm:dword, bits:dword, value:dword |
||
682 | ; int put; |
||
683 | |||
684 | mov ebx,[strm] |
||
685 | cmp ebx,Z_NULL |
||
686 | je @f |
||
687 | mov edi,[ebx+z_stream.state] ;s = strm.state |
||
688 | cmp edi,Z_NULL |
||
689 | jne .end0 |
||
690 | @@: ;if (..==0 || ..==0) return .. |
||
691 | mov eax,Z_STREAM_ERROR |
||
692 | jmp .end_f |
||
693 | .end0: |
||
694 | ; if ((Bytef *)(s->d_buf) < s->pending_out + ((Buf_size + 7) >> 3)) |
||
695 | ; return Z_BUF_ERROR; |
||
696 | ; do { |
||
697 | ; put = Buf_size - s->bi_valid; |
||
698 | ; if (put > bits) |
||
699 | ; put = bits; |
||
700 | ; s->bi_buf |= (uint_16)((value & ((1 << put) - 1)) << s->bi_valid); |
||
701 | ; s->bi_valid += put; |
||
702 | ; _tr_flush_bits(s); |
||
703 | ; value >>= put; |
||
704 | ; bits -= put; |
||
705 | ; } while (bits); |
||
706 | mov eax,Z_OK |
||
707 | .end_f: |
||
708 | ret |
||
709 | endp |
||
710 | |||
711 | ; ========================================================================= |
||
712 | ;int (strm, level, strategy) |
||
6639 | IgorA | 713 | ; z_streamp strm |
714 | ; int level |
||
715 | ; int strategy |
||
6617 | IgorA | 716 | align 4 |
717 | proc deflateParams uses ebx edi, strm:dword, level:dword, strategy:dword |
||
6797 | IgorA | 718 | locals |
719 | co_func dd ? |
||
720 | err dd Z_OK |
||
721 | endl |
||
6617 | IgorA | 722 | |
723 | mov ebx,[strm] |
||
724 | cmp ebx,Z_NULL |
||
725 | je @f |
||
726 | mov edi,[ebx+z_stream.state] ;s = strm.state |
||
727 | cmp edi,Z_NULL |
||
728 | jne .end0 |
||
729 | @@: ;if (..==0 || ..==0) return .. |
||
730 | mov eax,Z_STREAM_ERROR |
||
731 | jmp .end_f |
||
732 | .end0: |
||
733 | |||
734 | if FASTEST eq 1 |
||
735 | cmp dword[level],0 |
||
736 | je @f ;if (..!=0) |
||
737 | mov dword[level],1 |
||
738 | @@: |
||
739 | else |
||
740 | cmp dword[level],Z_DEFAULT_COMPRESSION |
||
741 | jne @f ;if (..==0) |
||
742 | mov dword[level],6 |
||
743 | @@: |
||
744 | end if |
||
6797 | IgorA | 745 | cmp dword[level],0 |
746 | jl @f |
||
747 | cmp dword[level],9 |
||
748 | jg @f |
||
749 | cmp dword[strategy],0 |
||
750 | jl @f |
||
751 | cmp dword[strategy],Z_FIXED |
||
752 | jle .end1 |
||
753 | @@: ;if (..<0 || ..>9 || ..<0 || ..>..) |
||
754 | mov eax,Z_STREAM_ERROR |
||
755 | jmp .end_f |
||
756 | .end1: |
||
757 | movzx eax,word[edi+deflate_state.level] |
||
758 | imul eax,sizeof.config_s |
||
759 | add eax,configuration_table+config_s.co_func |
||
760 | mov [co_func],eax |
||
6617 | IgorA | 761 | |
6797 | IgorA | 762 | ; if ((strategy != s->strategy || co_func != configuration_table[level].func) && |
6617 | IgorA | 763 | ; strm->total_in != 0) { |
6797 | IgorA | 764 | ; Flush the last buffer: |
6617 | IgorA | 765 | ; err = deflate(strm, Z_BLOCK); |
766 | ; if (err == Z_BUF_ERROR && s->pending == 0) |
||
767 | ; err = Z_OK; |
||
768 | ; } |
||
769 | ; if (s->level != level) { |
||
770 | ; s->level = level; |
||
771 | ; s->max_lazy_match = configuration_table[level].max_lazy; |
||
772 | ; s->good_match = configuration_table[level].good_length; |
||
773 | ; s->nice_match = configuration_table[level].nice_length; |
||
774 | ; s->max_chain_length = configuration_table[level].max_chain; |
||
775 | ; } |
||
6797 | IgorA | 776 | mov eax,[strategy] |
777 | mov [edi+deflate_state.strategy],ax |
||
778 | mov eax,[err] |
||
6617 | IgorA | 779 | .end_f: |
780 | ret |
||
781 | endp |
||
782 | |||
783 | ; ========================================================================= |
||
784 | ;int (strm, good_length, max_lazy, nice_length, max_chain) |
||
6639 | IgorA | 785 | ; z_streamp strm |
786 | ; int good_length |
||
787 | ; int max_lazy |
||
788 | ; int nice_length |
||
789 | ; int max_chain |
||
6617 | IgorA | 790 | align 4 |
791 | proc deflateTune uses ebx, strm:dword, good_length:dword, max_lazy:dword,\ |
||
792 | nice_length:dword, max_chain:dword |
||
793 | mov ebx,[strm] |
||
794 | cmp ebx,Z_NULL |
||
795 | je @f |
||
796 | cmp dword[ebx+z_stream.state],Z_NULL |
||
797 | jne .end0 |
||
798 | @@: ;if (..==0 || ..==0) return .. |
||
799 | mov eax,Z_STREAM_ERROR |
||
800 | jmp .end_f |
||
801 | .end0: |
||
802 | mov ebx,[ebx+z_stream.state] ;s = strm.state |
||
803 | mov eax,[good_length] |
||
804 | mov [ebx+deflate_state.good_match],eax |
||
805 | mov eax,[max_lazy] |
||
806 | mov [ebx+deflate_state.max_lazy_match],eax |
||
807 | mov eax,[nice_length] |
||
808 | mov [ebx+deflate_state.nice_match],eax |
||
809 | mov eax,[max_chain] |
||
810 | mov [ebx+deflate_state.max_chain_length],eax |
||
811 | mov eax,Z_OK |
||
812 | .end_f: |
||
813 | ret |
||
814 | endp |
||
815 | |||
816 | ; ========================================================================= |
||
817 | ; For the default windowBits of 15 and memLevel of 8, this function returns |
||
818 | ; a close to exact, as well as small, upper bound on the compressed size. |
||
819 | ; They are coded as constants here for a reason--if the #define's are |
||
820 | ; changed, then this function needs to be changed as well. The return |
||
821 | ; value for 15 and 8 only works for those exact settings. |
||
822 | |||
823 | ; For any setting other than those defaults for windowBits and memLevel, |
||
824 | ; the value returned is a conservative worst case for the maximum expansion |
||
825 | ; resulting from using fixed blocks instead of stored blocks, which deflate |
||
826 | ; can emit on compressed data for some combinations of the parameters. |
||
827 | |||
828 | ; This function could be more sophisticated to provide closer upper bounds for |
||
829 | ; every combination of windowBits and memLevel. But even the conservative |
||
830 | ; upper bound of about 14% expansion does not seem onerous for output buffer |
||
831 | ; allocation. |
||
832 | |||
833 | ;uLong (strm, sourceLen) |
||
6639 | IgorA | 834 | ; z_streamp strm |
835 | ; uLong sourceLen |
||
6617 | IgorA | 836 | align 4 |
837 | proc deflateBound, strm:dword, sourceLen:dword |
||
838 | ; deflate_state *s; |
||
839 | ; uLong complen, wraplen; |
||
840 | ; Bytef *str; |
||
6639 | IgorA | 841 | zlib_debug 'deflateBound' |
6617 | IgorA | 842 | |
843 | ; conservative upper bound for compressed data |
||
844 | ; complen = sourceLen + |
||
845 | ; ((sourceLen + 7) >> 3) + ((sourceLen + 63) >> 6) + 5; |
||
846 | |||
847 | ; if can't get parameters, return conservative bound plus zlib wrapper |
||
848 | ; if (strm == Z_NULL || strm->state == Z_NULL) |
||
849 | ; return complen + 6; |
||
850 | |||
851 | ; compute wrapper length |
||
852 | ; s = strm->state; |
||
853 | ; switch (s->wrap) { |
||
854 | ; case 0: /* raw deflate */ |
||
855 | ; wraplen = 0; |
||
856 | ; break; |
||
857 | ; case 1: /* zlib wrapper */ |
||
858 | ; wraplen = 6 + (s->strstart ? 4 : 0); |
||
859 | ; break; |
||
860 | ; case 2: /* gzip wrapper */ |
||
861 | ; wraplen = 18; |
||
862 | ; if (s->gzhead != Z_NULL) { /* user-supplied gzip header */ |
||
863 | ; if (s->gzhead->extra != Z_NULL) |
||
864 | ; wraplen += 2 + s->gzhead->extra_len; |
||
865 | ; str = s->gzhead->name; |
||
866 | ; if (str != Z_NULL) |
||
867 | ; do { |
||
868 | ; wraplen++; |
||
869 | ; } while (*str++); |
||
870 | ; str = s->gzhead->comment; |
||
871 | ; if (str != Z_NULL) |
||
872 | ; do { |
||
873 | ; wraplen++; |
||
874 | ; } while (*str++); |
||
875 | ; if (s->gzhead->hcrc) |
||
876 | ; wraplen += 2; |
||
877 | ; } |
||
878 | ; break; |
||
879 | ; default: /* for compiler happiness */ |
||
880 | ; wraplen = 6; |
||
881 | ; } |
||
882 | |||
883 | ; if not default parameters, return conservative bound |
||
884 | ; if (s->w_bits != 15 || s->hash_bits != 8 + 7) |
||
885 | ; return complen + wraplen; |
||
886 | |||
887 | ; default settings: return tight bound for that case |
||
888 | ; return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + |
||
889 | ; (sourceLen >> 25) + 13 - 6 + wraplen; |
||
890 | .end_f: |
||
891 | ret |
||
892 | endp |
||
893 | |||
894 | ; ========================================================================= |
||
895 | ; Put a short in the pending buffer. The 16-bit value is put in MSB order. |
||
896 | ; IN assertion: the stream state is correct and there is enough room in |
||
897 | ; pending_buf. |
||
898 | |||
899 | ;void (s, b) |
||
6639 | IgorA | 900 | ; deflate_state *s |
901 | ; uInt b |
||
6617 | IgorA | 902 | align 4 |
903 | proc putShortMSB uses ebx ecx, s:dword, b:dword |
||
904 | mov ebx,[s] |
||
905 | mov ecx,[b] |
||
906 | put_byte ebx, ch |
||
907 | put_byte ebx, cl |
||
908 | ret |
||
909 | endp |
||
910 | |||
911 | ; ========================================================================= |
||
912 | ; Flush as much pending output as possible. All deflate() output goes |
||
913 | ; through this function so some applications may wish to modify it |
||
914 | ; to avoid allocating a large strm->next_out buffer and copying into it. |
||
915 | ; (See also read_buf()). |
||
916 | |||
917 | ;void (strm) |
||
6639 | IgorA | 918 | ; z_streamp strm |
6617 | IgorA | 919 | align 4 |
920 | proc flush_pending uses eax ebx ecx edx, strm:dword |
||
921 | ;ecx - len |
||
922 | ;edx - deflate_state *s |
||
923 | ;ebx - strm |
||
6639 | IgorA | 924 | zlib_debug 'flush_pending' |
6617 | IgorA | 925 | mov ebx,[strm] |
926 | mov edx,[ebx+z_stream.state] |
||
927 | |||
928 | stdcall _tr_flush_bits, edx |
||
6741 | IgorA | 929 | mov ecx,[edx+deflate_state.pending] |
6797 | IgorA | 930 | mov eax,[ebx+z_stream.avail_out] |
6780 | IgorA | 931 | cmp ecx,eax |
6617 | IgorA | 932 | jle @f ;if (..>..) |
6797 | IgorA | 933 | mov ecx,eax |
6617 | IgorA | 934 | @@: |
935 | cmp ecx,0 |
||
936 | je @f |
||
937 | |||
938 | stdcall zmemcpy, [ebx+z_stream.next_out], [edx+deflate_state.pending_out], ecx |
||
939 | add [ebx+z_stream.next_out],ecx |
||
940 | add [edx+deflate_state.pending_out],ecx |
||
941 | add [ebx+z_stream.total_out],ecx |
||
6797 | IgorA | 942 | sub [ebx+z_stream.avail_out],ecx |
6741 | IgorA | 943 | sub [edx+deflate_state.pending],ecx |
944 | cmp dword[edx+deflate_state.pending],0 |
||
6617 | IgorA | 945 | jne @f ;if (..==0) |
946 | mov eax,[edx+deflate_state.pending_buf] |
||
947 | mov [edx+deflate_state.pending_out],eax |
||
948 | @@: |
||
949 | ret |
||
950 | endp |
||
951 | |||
952 | ; ========================================================================= |
||
953 | ;int (strm, flush) |
||
6639 | IgorA | 954 | ; z_streamp strm |
955 | ; int flush |
||
6617 | IgorA | 956 | align 4 |
957 | proc deflate uses ebx ecx edx edi esi, strm:dword, flush:dword |
||
958 | locals |
||
959 | old_flush dd ? ;int ;value of flush param for previous deflate call |
||
960 | val dd ? |
||
961 | endl |
||
962 | mov ebx,[strm] |
||
963 | zlib_debug 'deflate strm = %d',ebx |
||
964 | cmp ebx,Z_NULL |
||
965 | je @f |
||
966 | mov edi,[ebx+z_stream.state] ;s = strm.state |
||
967 | cmp edi,Z_NULL |
||
968 | je @f |
||
969 | cmp dword[flush],Z_BLOCK |
||
970 | jg @f |
||
971 | cmp dword[flush],0 |
||
6652 | IgorA | 972 | jge .end10 ;if (..==0 || ..==0 || ..>.. || ..<0) |
6617 | IgorA | 973 | @@: |
974 | mov eax,Z_STREAM_ERROR |
||
975 | jmp .end_f |
||
976 | .end10: |
||
977 | cmp dword[ebx+z_stream.next_out],Z_NULL |
||
978 | je .beg0 |
||
979 | cmp dword[ebx+z_stream.next_in],Z_NULL |
||
980 | jne @f |
||
6704 | IgorA | 981 | cmp dword[ebx+z_stream.avail_in],0 |
6617 | IgorA | 982 | jne .beg0 |
983 | @@: |
||
984 | cmp dword[edi+deflate_state.status],FINISH_STATE |
||
985 | jne .end0 |
||
986 | cmp dword[flush],Z_FINISH |
||
987 | je .end0 |
||
6652 | IgorA | 988 | .beg0: ;if (..==0 || (..==0 && ..!=0) || (..==.. && ..!=..)) |
6617 | IgorA | 989 | ERR_RETURN ebx, Z_STREAM_ERROR |
990 | jmp .end_f |
||
991 | .end0: |
||
6797 | IgorA | 992 | cmp dword[ebx+z_stream.avail_out],0 |
6617 | IgorA | 993 | jne @f ;if (..==0) |
994 | ERR_RETURN ebx, Z_BUF_ERROR |
||
995 | jmp .end_f |
||
996 | @@: |
||
997 | |||
998 | mov dword[edi+deflate_state.strm],ebx ;just in case |
||
999 | mov eax,[edi+deflate_state.last_flush] |
||
1000 | mov [old_flush],eax |
||
1001 | mov eax,[flush] |
||
1002 | mov [edi+deflate_state.last_flush],eax |
||
1003 | |||
1004 | ; Write the header |
||
1005 | cmp dword[edi+deflate_state.status],INIT_STATE |
||
1006 | jne .end2 ;if (..==..) |
||
1007 | if GZIP eq 1 |
||
1008 | cmp dword[edi+deflate_state.wrap],2 |
||
1009 | jne .end1 ;if (..==..) |
||
6639 | IgorA | 1010 | xor eax,eax ;stdcall calc_crc32, 0, Z_NULL, 0 |
6617 | IgorA | 1011 | mov [ebx+z_stream.adler],eax |
1012 | put_byte edi, 31 |
||
1013 | put_byte edi, 139 |
||
1014 | put_byte edi, 8 |
||
1015 | cmp dword[edi+deflate_state.gzhead],Z_NULL |
||
1016 | jne .end3 ;if (..==0) |
||
1017 | put_byte edi, 0 |
||
1018 | put_dword edi, 0 |
||
1019 | xor cl,cl |
||
1020 | cmp word[edi+deflate_state.level],2 |
||
1021 | jge @f |
||
1022 | mov cl,4 |
||
1023 | @@: |
||
1024 | cmp word[edi+deflate_state.strategy],Z_HUFFMAN_ONLY |
||
1025 | jl @f |
||
1026 | mov cl,4 |
||
1027 | @@: |
||
1028 | cmp word[edi+deflate_state.level],9 |
||
1029 | jne @f |
||
1030 | mov cl,2 |
||
1031 | @@: ;..==.. ? 2 : (..>=.. || ..<.. ? 4 : 0) |
||
1032 | put_byte edi, cl |
||
1033 | put_byte edi, OS_CODE |
||
1034 | mov dword[edi+deflate_state.status],BUSY_STATE |
||
1035 | jmp .end2 |
||
1036 | .end3: ;else |
||
1037 | mov edx,[edi+deflate_state.gzhead] |
||
1038 | xor cl,cl |
||
1039 | cmp [edx+gz_header.text],0 |
||
1040 | je @f |
||
1041 | inc cl |
||
1042 | @@: |
||
1043 | cmp [edx+gz_header.hcrc],0 |
||
1044 | je @f |
||
1045 | add cl,2 |
||
1046 | @@: |
||
1047 | cmp [edx+gz_header.extra],Z_NULL |
||
1048 | je @f |
||
1049 | add cl,4 |
||
1050 | @@: |
||
1051 | cmp [edx+gz_header.name],Z_NULL |
||
1052 | je @f |
||
1053 | add cl,8 |
||
1054 | @@: |
||
1055 | cmp [edx+gz_header.comment],Z_NULL |
||
1056 | je @f |
||
1057 | add cl,16 |
||
1058 | @@: |
||
1059 | put_byte edi, cl |
||
1060 | mov ecx,[edx+gz_header.time] |
||
1061 | put_dword edi, ecx |
||
1062 | xor cl,cl |
||
1063 | cmp word[edi+deflate_state.level],2 |
||
1064 | jge @f |
||
1065 | mov cl,4 |
||
1066 | @@: |
||
1067 | cmp word[edi+deflate_state.strategy],Z_HUFFMAN_ONLY |
||
1068 | jl @f |
||
1069 | mov cl,4 |
||
1070 | @@: |
||
1071 | cmp word[edi+deflate_state.level],9 |
||
1072 | jne @f |
||
1073 | mov cl,2 |
||
1074 | @@: ;..==.. ? 2 : (..>=.. || ..<.. ? 4 : 0) |
||
1075 | put_byte edi, cl |
||
1076 | mov ecx,[edx+gz_header.os] |
||
1077 | put_byte edi, cl |
||
1078 | cmp dword[edx+gz_header.extra],Z_NULL |
||
1079 | je @f ;if (..!=0) |
||
1080 | mov ecx,[edx+gz_header.extra_len] |
||
1081 | put_byte edi, cl |
||
1082 | put_byte edi, ch |
||
1083 | @@: |
||
1084 | cmp dword[edx+gz_header.hcrc],0 |
||
1085 | je @f ;if (..) |
||
1086 | stdcall calc_crc32, [ebx+z_stream.adler],\ |
||
6741 | IgorA | 1087 | [edi+deflate_state.pending_buf], [edi+deflate_state.pending] |
6617 | IgorA | 1088 | mov [ebx+z_stream.adler],eax |
1089 | @@: |
||
1090 | mov dword[edi+deflate_state.gzindex],0 |
||
1091 | mov dword[edi+deflate_state.status],EXTRA_STATE |
||
1092 | jmp .end2 |
||
1093 | .end1: ;else |
||
1094 | end if |
||
1095 | mov edx,[edi+deflate_state.w_bits] |
||
1096 | sub edx,8 |
||
1097 | shl edx,4 |
||
1098 | add edx,Z_DEFLATED |
||
1099 | shl edx,8 ;edx = header |
||
1100 | ;esi = level_flags |
||
1101 | |||
1102 | mov esi,3 |
||
1103 | cmp word[edi+deflate_state.strategy],Z_HUFFMAN_ONLY |
||
6652 | IgorA | 1104 | jge @f |
6617 | IgorA | 1105 | cmp word[edi+deflate_state.level],2 |
6652 | IgorA | 1106 | jge .end30 ;if (..>=.. || ..<..) |
1107 | @@: |
||
6617 | IgorA | 1108 | xor esi,esi |
1109 | jmp .end4 |
||
6652 | IgorA | 1110 | .end30: |
6617 | IgorA | 1111 | cmp word[edi+deflate_state.level],6 |
1112 | jge @f ;else if (..<..) |
||
1113 | mov esi,1 |
||
1114 | jmp .end4 |
||
1115 | @@: |
||
1116 | ;;cmp word[edi+deflate_state.level],6 |
||
1117 | jne .end4 ;else if (..==..) |
||
1118 | mov esi,2 |
||
1119 | .end4: |
||
1120 | shl esi,6 |
||
1121 | or edx,esi |
||
1122 | cmp dword[edi+deflate_state.strstart],0 |
||
1123 | je @f ;if (..!=0) |
||
1124 | or edx,PRESET_DICT |
||
1125 | @@: |
||
1126 | mov esi,edx |
||
1127 | mov eax,edx |
||
1128 | xor edx,edx |
||
1129 | mov ecx,31 |
||
1130 | div ecx |
||
1131 | add esi,31 |
||
1132 | sub esi,edx ;esi = header |
||
1133 | |||
1134 | mov dword[edi+deflate_state.status],BUSY_STATE |
||
1135 | stdcall putShortMSB, edi, esi |
||
1136 | |||
1137 | ; Save the adler32 of the preset dictionary: |
||
1138 | cmp dword[edi+deflate_state.strstart],0 |
||
1139 | je @f ;if (..!=0) |
||
1140 | mov ecx,[ebx+z_stream.adler] |
||
1141 | bswap ecx |
||
1142 | put_dword edi, ecx |
||
1143 | @@: |
||
6639 | IgorA | 1144 | xor eax,eax ;stdcall calc_crc32, 0, Z_NULL, 0 |
6617 | IgorA | 1145 | mov [ebx+z_stream.adler],eax |
1146 | .end2: |
||
1147 | if GZIP eq 1 |
||
1148 | mov edx,[edi+deflate_state.gzhead] |
||
1149 | cmp dword[edi+deflate_state.status],EXTRA_STATE |
||
1150 | jne .end5 ;if (..==..) |
||
1151 | cmp dword[edx+gz_header.extra],Z_NULL |
||
1152 | je .end21 ;if (..!=..) |
||
6741 | IgorA | 1153 | mov esi,[edi+deflate_state.pending] |
6617 | IgorA | 1154 | ;esi = beg ;start of bytes to update crc |
1155 | |||
1156 | movzx ecx,word[edx+gz_header.extra_len] |
||
1157 | .cycle0: ;while (..<..) |
||
1158 | cmp dword[edi+deflate_state.gzindex],ecx |
||
1159 | jge .cycle0end |
||
6741 | IgorA | 1160 | mov eax,[edi+deflate_state.pending] |
6617 | IgorA | 1161 | cmp eax,[edi+deflate_state.pending_buf_size] |
1162 | jne .end24 ;if (..==..) |
||
1163 | mov dword[edx+gz_header.hcrc],0 |
||
1164 | je @f |
||
6741 | IgorA | 1165 | cmp [edi+deflate_state.pending],esi |
6617 | IgorA | 1166 | jle @f ;if (.. && ..>..) |
6741 | IgorA | 1167 | mov ecx,[edi+deflate_state.pending] |
6617 | IgorA | 1168 | sub ecx,esi |
1169 | mov eax,[edi+deflate_state.pending_buf] |
||
1170 | add eax,esi |
||
1171 | stdcall calc_crc32, [ebx+z_stream.adler], eax, ecx |
||
1172 | mov [ebx+z_stream.adler],eax |
||
1173 | @@: |
||
1174 | stdcall flush_pending, ebx |
||
6741 | IgorA | 1175 | mov esi,[edi+deflate_state.pending] |
6617 | IgorA | 1176 | cmp esi,[edi+deflate_state.pending_buf_size] |
1177 | je .cycle0end ;if (..==..) break |
||
1178 | .end24: |
||
1179 | push ebx |
||
1180 | mov ebx,[edi+deflate_state.gzindex] |
||
1181 | add ebx,[edx+gz_header.extra] |
||
1182 | mov bl,[ebx] |
||
1183 | put_byte edi, bl |
||
1184 | pop ebx |
||
1185 | inc dword[edi+deflate_state.gzindex] |
||
1186 | jmp .cycle0 |
||
1187 | .cycle0end: |
||
1188 | mov dword[edx+gz_header.hcrc],0 |
||
1189 | je @f |
||
6741 | IgorA | 1190 | cmp [edi+deflate_state.pending],esi |
6617 | IgorA | 1191 | jle @f ;if (.. && ..>..) |
6741 | IgorA | 1192 | mov ecx,[edi+deflate_state.pending] |
6617 | IgorA | 1193 | sub ecx,esi |
1194 | mov eax,[edi+deflate_state.pending_buf] |
||
1195 | add eax,esi |
||
1196 | stdcall calc_crc32, [ebx+z_stream.adler], eax, ecx |
||
1197 | mov [ebx+z_stream.adler],eax |
||
1198 | @@: |
||
1199 | mov eax,[edx+gz_header.extra_len] |
||
1200 | cmp dword[edi+deflate_state.gzindex],eax |
||
1201 | jne .end5 ;if (..==..) |
||
1202 | mov dword[edi+deflate_state.gzindex],0 |
||
1203 | mov dword[edi+deflate_state.status],NAME_STATE |
||
1204 | jmp .end5 |
||
1205 | .end21: ;else |
||
1206 | mov dword[edi+deflate_state.status],NAME_STATE |
||
1207 | .end5: |
||
1208 | cmp dword[edi+deflate_state.status],NAME_STATE |
||
1209 | jne .end6 ;if (..==..) |
||
1210 | cmp dword[edx+gz_header.name],Z_NULL |
||
1211 | je .end22 ;if (..!=..) |
||
6741 | IgorA | 1212 | mov esi,[edi+deflate_state.pending] |
6617 | IgorA | 1213 | ;esi = beg ;start of bytes to update crc |
1214 | |||
1215 | .cycle1: ;do |
||
6741 | IgorA | 1216 | mov eax,[edi+deflate_state.pending] |
6617 | IgorA | 1217 | cmp eax,[edi+deflate_state.pending_buf_size] |
1218 | jne .end25 ;if (..==..) |
||
1219 | mov dword[edx+gz_header.hcrc],0 |
||
1220 | je @f |
||
6741 | IgorA | 1221 | cmp [edi+deflate_state.pending],esi |
6617 | IgorA | 1222 | jle @f ;if (.. && ..>..) |
6741 | IgorA | 1223 | mov ecx,[edi+deflate_state.pending] |
6617 | IgorA | 1224 | sub ecx,esi |
1225 | mov eax,[edi+deflate_state.pending_buf] |
||
1226 | add eax,esi |
||
1227 | stdcall calc_crc32, [ebx+z_stream.adler], eax, ecx |
||
1228 | mov [ebx+z_stream.adler],eax |
||
1229 | @@: |
||
1230 | stdcall flush_pending, ebx |
||
6741 | IgorA | 1231 | mov esi,[edi+deflate_state.pending] |
1232 | cmp esi,[edi+deflate_state.pending_buf_size] |
||
6617 | IgorA | 1233 | jne .end25 ;if (..==..) |
1234 | mov dword[val],1 |
||
1235 | jmp .cycle1end |
||
1236 | .end25: |
||
1237 | push ebx |
||
1238 | mov ebx,[edi+deflate_state.gzindex] |
||
1239 | add ebx,[edx+gz_header.name] |
||
1240 | movzx ebx,byte[ebx] |
||
1241 | mov [val],ebx |
||
1242 | inc dword[edi+deflate_state.gzindex] |
||
1243 | put_byte edi, bl |
||
1244 | pop ebx |
||
1245 | cmp dword[val],0 |
||
1246 | jne .cycle1 ;while (val != 0) |
||
1247 | .cycle1end: |
||
1248 | mov dword[edx+gz_header.hcrc],0 |
||
1249 | je @f |
||
6741 | IgorA | 1250 | cmp [edi+deflate_state.pending],esi |
6617 | IgorA | 1251 | jle @f ;if (.. && ..>..) |
6741 | IgorA | 1252 | mov ecx,[edi+deflate_state.pending] |
6617 | IgorA | 1253 | sub ecx,esi |
1254 | mov eax,[edi+deflate_state.pending_buf] |
||
1255 | add eax,esi |
||
1256 | stdcall calc_crc32, [ebx+z_stream.adler], eax, ecx |
||
1257 | mov [ebx+z_stream.adler],eax |
||
1258 | @@: |
||
1259 | cmp dword[val],0 |
||
1260 | jne .end6 ;if (val == 0) |
||
1261 | mov dword[edi+deflate_state.gzindex],0 |
||
1262 | mov dword[edi+deflate_state.status],COMMENT_STATE |
||
1263 | jmp .end6 |
||
1264 | .end22: ;else |
||
1265 | mov dword[edi+deflate_state.status],COMMENT_STATE; |
||
1266 | .end6: |
||
1267 | cmp dword[edi+deflate_state.status],COMMENT_STATE |
||
1268 | jne .end7 ;if (..==..) |
||
1269 | cmp dword[edx+gz_header.comment],Z_NULL |
||
1270 | je .end23 ;if (..!=..) |
||
6741 | IgorA | 1271 | mov esi,[edi+deflate_state.pending] |
6617 | IgorA | 1272 | ;esi = beg ;start of bytes to update crc |
1273 | |||
1274 | .cycle2: ;do |
||
6741 | IgorA | 1275 | mov eax,[edi+deflate_state.pending] |
6617 | IgorA | 1276 | cmp eax,[edi+deflate_state.pending_buf_size] |
1277 | jne .end26 ;if (..==..) |
||
1278 | mov dword[edx+gz_header.hcrc],0 |
||
1279 | je @f |
||
6741 | IgorA | 1280 | cmp [edi+deflate_state.pending],esi |
6617 | IgorA | 1281 | jle @f ;if (.. && ..>..) |
6741 | IgorA | 1282 | mov ecx,[edi+deflate_state.pending] |
6617 | IgorA | 1283 | sub ecx,esi |
1284 | mov eax,[edi+deflate_state.pending_buf] |
||
1285 | add eax,esi |
||
1286 | stdcall calc_crc32, [ebx+z_stream.adler], eax, ecx |
||
1287 | mov [ebx+z_stream.adler],eax |
||
1288 | @@: |
||
1289 | stdcall flush_pending, ebx |
||
6741 | IgorA | 1290 | mov esi,[edi+deflate_state.pending] |
1291 | cmp esi,[edi+deflate_state.pending_buf_size] |
||
6617 | IgorA | 1292 | jne .end26 ;if (..==..) |
1293 | mov dword[val],1 |
||
1294 | jmp .cycle2end |
||
1295 | .end26: |
||
1296 | push ebx |
||
1297 | mov ebx,[edi+deflate_state.gzindex] |
||
1298 | add ebx,[edx+gz_header.comment] |
||
1299 | movzx ebx,byte[ebx] |
||
1300 | mov [val],ebx |
||
1301 | inc dword[edi+deflate_state.gzindex] |
||
1302 | put_byte edi, bl |
||
1303 | pop ebx |
||
1304 | cmp dword[val],0 |
||
1305 | jne .cycle2 ;while (val != 0) |
||
1306 | .cycle2end: |
||
1307 | mov dword[edx+gz_header.hcrc],0 |
||
1308 | je @f |
||
6741 | IgorA | 1309 | cmp [edi+deflate_state.pending],esi |
6617 | IgorA | 1310 | jle @f ;if (.. && ..>..) |
6741 | IgorA | 1311 | mov ecx,[edi+deflate_state.pending] |
6617 | IgorA | 1312 | sub ecx,esi |
1313 | mov eax,[edi+deflate_state.pending_buf] |
||
1314 | add eax,esi |
||
1315 | stdcall calc_crc32, [ebx+z_stream.adler], eax, ecx |
||
1316 | mov [ebx+z_stream.adler],eax |
||
1317 | @@: |
||
1318 | cmp dword[val],0 |
||
1319 | jne .end7 ;if (val == 0) |
||
1320 | mov dword[edi+deflate_state.status],HCRC_STATE |
||
1321 | jmp .end7 |
||
1322 | .end23: ;else |
||
1323 | mov dword[edi+deflate_state.status],HCRC_STATE |
||
1324 | .end7: |
||
1325 | cmp dword[edi+deflate_state.status],HCRC_STATE |
||
1326 | jne .end8 ;if (..==..) |
||
1327 | cmp dword[edx+gz_header.hcrc],0 |
||
1328 | je .end9 ;if (..) |
||
6741 | IgorA | 1329 | mov ecx,[edi+deflate_state.pending] |
6617 | IgorA | 1330 | add ecx,2 |
1331 | cmp ecx,[edi+deflate_state.pending_buf_size] |
||
1332 | jle @f ;if (..>..) |
||
1333 | stdcall flush_pending, ebx |
||
1334 | @@: |
||
6741 | IgorA | 1335 | mov ecx,[edi+deflate_state.pending] |
6617 | IgorA | 1336 | add ecx,2 |
1337 | cmp ecx,[edi+deflate_state.pending_buf_size] |
||
1338 | jg @f ;if (..<=..) |
||
1339 | mov ecx,[ebx+z_stream.adler] |
||
1340 | put_byte edi, cl |
||
1341 | put_byte edi, ch |
||
6639 | IgorA | 1342 | xor eax,eax ;stdcall calc_crc32, 0, Z_NULL, 0 |
6617 | IgorA | 1343 | mov [ebx+z_stream.adler],eax |
1344 | mov dword[edi+deflate_state.status],BUSY_STATE |
||
1345 | @@: |
||
1346 | jmp .end8 |
||
1347 | .end9: ;else |
||
1348 | mov dword[edi+deflate_state.status],BUSY_STATE |
||
1349 | .end8: |
||
1350 | end if |
||
1351 | |||
1352 | ; Flush as much pending output as possible |
||
6741 | IgorA | 1353 | cmp dword[edi+deflate_state.pending],0 |
6617 | IgorA | 1354 | je .end13 ;if (..!=0) |
1355 | stdcall flush_pending, ebx |
||
6797 | IgorA | 1356 | cmp dword[ebx+z_stream.avail_out],0 |
6617 | IgorA | 1357 | jne @f ;if (..==0) |
1358 | ; Since avail_out is 0, deflate will be called again with |
||
1359 | ; more output space, but possibly with both pending and |
||
1360 | ; avail_in equal to zero. There won't be anything to do, |
||
1361 | ; but this is not an error situation so make sure we |
||
1362 | ; return OK instead of BUF_ERROR at next call of deflate: |
||
1363 | |||
1364 | mov dword[edi+deflate_state.last_flush],-1 |
||
1365 | mov eax,Z_OK |
||
1366 | jmp .end_f |
||
1367 | @@: |
||
1368 | ; Make sure there is something to do and avoid duplicate consecutive |
||
1369 | ; flushes. For repeated and useless calls with Z_FINISH, we keep |
||
1370 | ; returning Z_STREAM_END instead of Z_BUF_ERROR. |
||
1371 | jmp @f |
||
1372 | .end13: |
||
6704 | IgorA | 1373 | cmp dword[ebx+z_stream.avail_in],0 |
6617 | IgorA | 1374 | jne @f |
1375 | RANK dword[old_flush],esi |
||
1376 | RANK dword[flush],eax |
||
1377 | cmp eax,esi |
||
1378 | jg @f |
||
1379 | cmp dword[flush],Z_FINISH |
||
1380 | je @f ;else if (..==0 && ..<=.. && ..!=..) |
||
1381 | ERR_RETURN ebx, Z_BUF_ERROR |
||
1382 | jmp .end_f |
||
1383 | @@: |
||
1384 | |||
1385 | ; User must not provide more input after the first FINISH: |
||
1386 | cmp dword[edi+deflate_state.status],FINISH_STATE |
||
1387 | jne @f |
||
6704 | IgorA | 1388 | cmp dword[ebx+z_stream.avail_in],0 |
6617 | IgorA | 1389 | je @f ;if (..==.. && ..!=0) |
1390 | ERR_RETURN ebx, Z_BUF_ERROR |
||
1391 | jmp .end_f |
||
1392 | @@: |
||
1393 | |||
1394 | ; Start a new block or continue the current one. |
||
1395 | |||
6704 | IgorA | 1396 | cmp dword[ebx+z_stream.avail_in],0 |
6617 | IgorA | 1397 | jne @f |
1398 | cmp dword[edi+deflate_state.lookahead],0 |
||
1399 | jne @f |
||
1400 | cmp dword[flush],Z_NO_FLUSH |
||
1401 | je .end11 |
||
1402 | cmp dword[edi+deflate_state.status],FINISH_STATE |
||
1403 | je .end11 |
||
1404 | @@: ;if (..!=0 || ..!=0 || (..!=.. && ..!=..)) |
||
1405 | ;edx = bstate |
||
1406 | cmp word[edi+deflate_state.strategy],Z_HUFFMAN_ONLY |
||
1407 | jne @f |
||
1408 | stdcall deflate_huff, edi, [flush] |
||
1409 | jmp .end20 |
||
1410 | @@: |
||
1411 | cmp word[edi+deflate_state.strategy],Z_RLE |
||
1412 | jne @f |
||
1413 | stdcall deflate_rle, edi, [flush] |
||
1414 | jmp .end20 |
||
1415 | @@: |
||
1416 | movzx eax,word[edi+deflate_state.level] |
||
1417 | imul eax,sizeof.config_s |
||
1418 | add eax,configuration_table+config_s.co_func |
||
1419 | stdcall dword[eax], edi, [flush] |
||
1420 | .end20: |
||
1421 | mov edx,eax |
||
1422 | |||
1423 | cmp edx,finish_started |
||
1424 | je @f |
||
1425 | cmp edx,finish_done |
||
6652 | IgorA | 1426 | jne .end18 |
6617 | IgorA | 1427 | @@: ;if (..==.. || ..==..) |
1428 | mov dword[edi+deflate_state.status],FINISH_STATE |
||
1429 | .end18: |
||
1430 | cmp edx,need_more |
||
1431 | je @f |
||
1432 | cmp edx,finish_started |
||
6652 | IgorA | 1433 | jne .end19 |
6617 | IgorA | 1434 | @@: ;if (..==.. || ..==..) |
6797 | IgorA | 1435 | cmp dword[ebx+z_stream.avail_out],0 |
6617 | IgorA | 1436 | jne @f ;if (..==0) |
1437 | mov dword[edi+deflate_state.last_flush],-1 ;avoid BUF_ERROR next call, see above |
||
1438 | @@: |
||
1439 | mov eax,Z_OK |
||
1440 | jmp .end_f |
||
1441 | ; If flush != Z_NO_FLUSH && avail_out == 0, the next call |
||
1442 | ; of deflate should use the same flush parameter to make sure |
||
1443 | ; that the flush is complete. So we don't have to output an |
||
1444 | ; empty block here, this will be done at next call. This also |
||
1445 | ; ensures that for a very small output buffer, we emit at most |
||
1446 | ; one empty block. |
||
1447 | |||
1448 | .end19: |
||
1449 | cmp edx,block_done |
||
1450 | jne .end11 ;if (..==..) |
||
1451 | cmp dword[flush],Z_PARTIAL_FLUSH |
||
1452 | jne @f ;if (..==..) |
||
1453 | stdcall _tr_align, edi |
||
1454 | jmp .end16 |
||
1455 | @@: |
||
1456 | cmp dword[flush],Z_BLOCK |
||
1457 | je .end16 ;else if (..!=..) ;FULL_FLUSH or SYNC_FLUSH |
||
1458 | stdcall _tr_stored_block, edi, 0, 0, 0 |
||
1459 | ; For a full flush, this empty block will be recognized |
||
1460 | ; as a special marker by inflate_sync(). |
||
1461 | |||
1462 | cmp dword[flush],Z_FULL_FLUSH |
||
1463 | jne .end16 ;if (..==..) |
||
1464 | CLEAR_HASH edi ;forget history |
||
1465 | cmp dword[edi+deflate_state.lookahead],0 |
||
1466 | jne .end16 ;if (..==0) |
||
1467 | mov dword[edi+deflate_state.strstart],0 |
||
1468 | mov dword[edi+deflate_state.block_start],0 |
||
1469 | mov dword[edi+deflate_state.insert],0 |
||
1470 | .end16: |
||
1471 | stdcall flush_pending, ebx |
||
6797 | IgorA | 1472 | cmp dword[ebx+z_stream.avail_out],0 |
6617 | IgorA | 1473 | jne .end11 ;if (..==0) |
1474 | mov dword[edi+deflate_state.last_flush],-1 ;avoid BUF_ERROR at next call, see above |
||
1475 | mov eax,Z_OK |
||
1476 | jmp .end_f |
||
1477 | .end11: |
||
6797 | IgorA | 1478 | cmp dword[ebx+z_stream.avail_out],0 |
6617 | IgorA | 1479 | jg @f |
6639 | IgorA | 1480 | zlib_assert 'bug2' ;Assert(..>0) |
6617 | IgorA | 1481 | @@: |
1482 | |||
1483 | cmp dword[flush],Z_FINISH |
||
1484 | je @f ;if (..!=0) |
||
1485 | mov eax,Z_OK |
||
1486 | jmp .end_f |
||
1487 | @@: |
||
1488 | cmp dword[edi+deflate_state.wrap],0 |
||
1489 | jg @f ;if (..<=0) |
||
1490 | mov eax,Z_STREAM_END |
||
1491 | jmp .end_f |
||
1492 | @@: |
||
1493 | |||
1494 | ; Write the trailer |
||
1495 | if GZIP eq 1 |
||
1496 | cmp dword[edi+deflate_state.wrap],2 |
||
1497 | jne @f ;if (..==..) |
||
1498 | mov ecx,[ebx+z_stream.adler] |
||
1499 | put_dword edi, ecx |
||
1500 | mov ecx,[ebx+z_stream.total_in] |
||
1501 | put_dword edi, ecx |
||
1502 | jmp .end17 |
||
1503 | @@: ;else |
||
1504 | end if |
||
1505 | mov ecx,[ebx+z_stream.adler] |
||
1506 | bswap ecx |
||
1507 | put_dword edi, ecx |
||
1508 | .end17: |
||
1509 | stdcall flush_pending, ebx |
||
1510 | ; If avail_out is zero, the application will call deflate again |
||
1511 | ; to flush the rest. |
||
1512 | |||
6741 | IgorA | 1513 | cmp dword[edi+deflate_state.pending],0 |
6617 | IgorA | 1514 | jle @f ;if (..>0) ;write the trailer only once! |
6741 | IgorA | 1515 | neg dword[edi+deflate_state.pending] |
1516 | inc dword[edi+deflate_state.pending] |
||
6617 | IgorA | 1517 | @@: |
1518 | mov eax,Z_OK |
||
6741 | IgorA | 1519 | cmp dword[edi+deflate_state.pending],0 |
6617 | IgorA | 1520 | je .end_f |
1521 | mov eax,Z_STREAM_END |
||
1522 | .end_f: |
||
1523 | zlib_debug ' deflate.ret = %d',eax |
||
1524 | ret |
||
1525 | endp |
||
1526 | |||
1527 | ; ========================================================================= |
||
1528 | ;int (strm) |
||
6639 | IgorA | 1529 | ; z_streamp strm |
6617 | IgorA | 1530 | align 4 |
1531 | proc deflateEnd uses ebx ecx edx, strm:dword |
||
1532 | mov ebx,[strm] |
||
1533 | zlib_debug 'deflateEnd' |
||
1534 | cmp ebx,Z_NULL |
||
1535 | je @f |
||
1536 | mov edx,[ebx+z_stream.state] |
||
1537 | cmp edx,Z_NULL |
||
1538 | jne .end0 |
||
1539 | @@: ;if (..==0 || ..==0) return .. |
||
1540 | mov eax,Z_STREAM_ERROR |
||
1541 | jmp .end_f |
||
1542 | .end0: |
||
1543 | |||
1544 | mov ecx,[edx+deflate_state.status] |
||
1545 | cmp ecx,INIT_STATE |
||
1546 | je @f |
||
1547 | cmp ecx,EXTRA_STATE |
||
1548 | je @f |
||
1549 | cmp ecx,NAME_STATE |
||
1550 | je @f |
||
1551 | cmp ecx,COMMENT_STATE |
||
1552 | je @f |
||
1553 | cmp ecx,HCRC_STATE |
||
1554 | je @f |
||
1555 | cmp ecx,BUSY_STATE |
||
1556 | je @f |
||
1557 | cmp ecx,FINISH_STATE |
||
1558 | je @f ;if (..!=.. && ..!=.. && ..!=.. && ..!=.. && ..!=.. && ..!=.. && ..!=..) |
||
1559 | mov eax,Z_STREAM_ERROR |
||
1560 | jmp .end_f |
||
1561 | @@: |
||
1562 | |||
1563 | ; Deallocate in reverse order of allocations: |
||
1564 | TRY_FREE ebx, dword[edx+deflate_state.pending_buf] |
||
1565 | TRY_FREE ebx, dword[edx+deflate_state.head] |
||
1566 | TRY_FREE ebx, dword[edx+deflate_state.prev] |
||
1567 | TRY_FREE ebx, dword[edx+deflate_state.window] |
||
1568 | |||
1569 | ZFREE ebx, dword[ebx+z_stream.state] |
||
1570 | mov dword[ebx+z_stream.state],Z_NULL |
||
1571 | |||
1572 | mov eax,Z_DATA_ERROR |
||
1573 | cmp ecx,BUSY_STATE |
||
1574 | je .end_f |
||
1575 | mov eax,Z_OK |
||
1576 | .end_f: |
||
1577 | ret |
||
1578 | endp |
||
1579 | |||
1580 | ; ========================================================================= |
||
1581 | ; Copy the source state to the destination state. |
||
1582 | ; To simplify the source, this is not supported for 16-bit MSDOS (which |
||
1583 | ; doesn't have enough memory anyway to duplicate compression states). |
||
1584 | |||
1585 | ;int (dest, source) |
||
6639 | IgorA | 1586 | ; z_streamp dest |
1587 | ; z_streamp source |
||
6617 | IgorA | 1588 | align 4 |
6639 | IgorA | 1589 | proc deflateCopy uses ebx edx edi esi, dest:dword, source:dword |
1590 | ;ebx = overlay ;uint_16p |
||
1591 | ;edi = ds ;deflate_state* |
||
1592 | ;esi = ss ;deflate_state* |
||
6617 | IgorA | 1593 | |
1594 | mov esi,[source] |
||
1595 | cmp esi,Z_NULL |
||
1596 | je @f |
||
1597 | mov edx,[dest] |
||
1598 | cmp edx,Z_NULL |
||
1599 | je @f |
||
1600 | mov esi,[esi+z_stream.state] |
||
1601 | cmp esi,Z_NULL |
||
1602 | jne .end0 |
||
1603 | @@: ;if (..==0 || ..==0 || ..==0) |
||
1604 | mov eax,Z_STREAM_ERROR |
||
1605 | jmp .end_f |
||
1606 | .end0: |
||
1607 | |||
1608 | stdcall zmemcpy, edx, [source], sizeof.z_stream |
||
1609 | |||
1610 | ZALLOC edx, 1, sizeof.deflate_state |
||
1611 | cmp eax,0 |
||
1612 | jne @f ;if (..==0) return .. |
||
1613 | mov eax,Z_MEM_ERROR |
||
1614 | jmp .end_f |
||
1615 | @@: |
||
1616 | mov edi,eax |
||
1617 | mov [edx+z_stream.state],eax |
||
1618 | stdcall zmemcpy, edi, esi, sizeof.deflate_state |
||
1619 | mov dword[edi+deflate_state.strm],edx |
||
1620 | |||
1621 | ZALLOC edx, [edi+deflate_state.w_size], 2 ;2*sizeof.db |
||
1622 | mov dword[edi+deflate_state.window],eax |
||
1623 | ZALLOC edx, [edi+deflate_state.w_size], 4 ;sizeof.dd |
||
1624 | mov dword[edi+deflate_state.prev],eax |
||
1625 | ZALLOC edx, [edi+deflate_state.hash_size], 4 ;sizeof.dd |
||
1626 | mov dword[edi+deflate_state.head],eax |
||
1627 | ZALLOC edx, [edi+deflate_state.lit_bufsize], 4 ;sizeof.dw+2 |
||
6639 | IgorA | 1628 | mov ebx,eax |
6617 | IgorA | 1629 | mov dword[edi+deflate_state.pending_buf],eax |
1630 | |||
1631 | cmp dword[edi+deflate_state.window],Z_NULL |
||
1632 | je @f |
||
1633 | cmp dword[edi+deflate_state.prev],Z_NULL |
||
1634 | je @f |
||
1635 | cmp dword[edi+deflate_state.head],Z_NULL |
||
1636 | je @f |
||
1637 | cmp dword[edi+deflate_state.pending_buf],Z_NULL |
||
1638 | jne .end1 |
||
1639 | @@: ;if (..==0 || ..==0 || ..==0 || ..==0) |
||
1640 | stdcall deflateEnd, edx |
||
1641 | mov eax,Z_MEM_ERROR |
||
1642 | jmp .end_f |
||
1643 | .end1: |
||
1644 | |||
1645 | ; following zmemcpy do not work for 16-bit MSDOS |
||
1646 | mov eax,[edi+deflate_state.w_size] |
||
1647 | shl eax,1 ;*= 2*sizeof.db |
||
1648 | stdcall zmemcpy, [edi+deflate_state.window], [esi+deflate_state.window], eax |
||
6639 | IgorA | 1649 | mov eax,[edi+deflate_state.w_size] |
1650 | shl eax,2 ;*= sizeof.dd |
||
1651 | stdcall zmemcpy, [edi+deflate_state.prev], [esi+deflate_state.prev], eax |
||
1652 | mov eax,[edi+deflate_state.hash_size] |
||
1653 | shl eax,2 ;*= sizeof.dd |
||
1654 | stdcall zmemcpy, [edi+deflate_state.head], [esi+deflate_state.head], eax |
||
1655 | stdcall zmemcpy, [edi+deflate_state.pending_buf], [esi+deflate_state.pending_buf], [edi+deflate_state.pending_buf_size] |
||
6617 | IgorA | 1656 | |
6639 | IgorA | 1657 | mov eax,[edi+deflate_state.pending_buf] |
1658 | add eax,[esi+deflate_state.pending_out] |
||
1659 | sub eax,[esi+deflate_state.pending_buf] |
||
1660 | mov [edi+deflate_state.pending_out],eax |
||
1661 | mov eax,[edi+deflate_state.lit_bufsize] |
||
1662 | shr eax,1 ;/=sizeof.uint_16 |
||
1663 | add eax,ebx |
||
1664 | mov [edi+deflate_state.d_buf],eax |
||
1665 | mov eax,[edi+deflate_state.lit_bufsize] |
||
1666 | imul eax,3 ;*=1+sizeof.uint_16 |
||
1667 | add eax,[edi+deflate_state.pending_buf] |
||
1668 | mov [edi+deflate_state.l_buf],eax |
||
6617 | IgorA | 1669 | |
1670 | mov eax,edi |
||
1671 | add eax,deflate_state.dyn_ltree |
||
1672 | mov [edi+deflate_state.l_desc.dyn_tree],eax |
||
1673 | add eax,deflate_state.dyn_dtree-deflate_state.dyn_ltree |
||
1674 | mov [edi+deflate_state.d_desc.dyn_tree],eax |
||
1675 | add eax,deflate_state.bl_tree-deflate_state.dyn_dtree |
||
1676 | mov [edi+deflate_state.bl_desc.dyn_tree],eax |
||
1677 | |||
1678 | mov eax,Z_OK |
||
1679 | .end_f: |
||
1680 | ret |
||
1681 | endp |
||
1682 | |||
1683 | ; =========================================================================== |
||
1684 | ; Read a new buffer from the current input stream, update the adler32 |
||
1685 | ; and total number of bytes read. All deflate() input goes through |
||
1686 | ; this function so some applications may wish to modify it to avoid |
||
1687 | ; allocating a large strm->next_in buffer and copying from it. |
||
1688 | ; (See also flush_pending()). |
||
1689 | |||
1690 | ;int (strm, buf, size) |
||
6639 | IgorA | 1691 | ; z_streamp strm |
1692 | ; Bytef *buf |
||
1693 | ; unsigned size |
||
6617 | IgorA | 1694 | align 4 |
1695 | proc read_buf uses ebx ecx, strm:dword, buf:dword, size:dword |
||
1696 | mov ebx,[strm] |
||
6704 | IgorA | 1697 | mov eax,[ebx+z_stream.avail_in] |
6617 | IgorA | 1698 | |
1699 | cmp eax,[size] |
||
1700 | jle @f ;if (..>..) |
||
1701 | mov eax,[size] |
||
1702 | @@: |
||
1703 | cmp eax,0 |
||
1704 | jg @f |
||
1705 | xor eax,eax |
||
1706 | jmp .end_f ;if (..==0) return 0 |
||
1707 | @@: |
||
1708 | |||
6704 | IgorA | 1709 | sub [ebx+z_stream.avail_in],eax |
6617 | IgorA | 1710 | |
1711 | stdcall zmemcpy, [buf],[ebx+z_stream.next_in],eax |
||
1712 | mov ecx,[ebx+z_stream.state] |
||
6797 | IgorA | 1713 | cmp dword[ecx+deflate_state.wrap],1 |
6617 | IgorA | 1714 | jne @f ;if (..==..) |
1715 | push eax |
||
1716 | stdcall adler32, [ebx+z_stream.adler], [buf], eax |
||
1717 | mov [ebx+z_stream.adler],eax |
||
1718 | pop eax |
||
1719 | jmp .end0 |
||
1720 | @@: |
||
1721 | if GZIP eq 1 |
||
6797 | IgorA | 1722 | cmp dword[ecx+deflate_state.wrap],2 |
6617 | IgorA | 1723 | jne .end0 ;else if (..==..) |
1724 | push eax |
||
1725 | stdcall calc_crc32, [ebx+z_stream.adler], [buf], eax |
||
1726 | mov [ebx+z_stream.adler],eax |
||
1727 | pop eax |
||
1728 | end if |
||
1729 | .end0: |
||
1730 | add [ebx+z_stream.next_in],eax |
||
1731 | add [ebx+z_stream.total_in],eax |
||
1732 | |||
1733 | .end_f: |
||
1734 | ;zlib_debug ' read_buf.ret = %d',eax |
||
1735 | ret |
||
1736 | endp |
||
1737 | |||
1738 | ; =========================================================================== |
||
1739 | ; Initialize the "longest match" routines for a new zlib stream |
||
1740 | |||
1741 | ;void (s) |
||
1742 | ; deflate_state *s |
||
1743 | align 4 |
||
1744 | proc lm_init uses eax ebx edi, s:dword |
||
1745 | mov edi,[s] |
||
1746 | mov eax,[edi+deflate_state.w_size] |
||
1747 | shl eax,1 |
||
1748 | mov [edi+deflate_state.window_size],eax |
||
1749 | |||
1750 | CLEAR_HASH edi |
||
1751 | |||
1752 | ; Set the default configuration parameters: |
||
1753 | |||
1754 | movzx eax,word[edi+deflate_state.level] |
||
1755 | imul eax,sizeof.config_s |
||
1756 | add eax,configuration_table |
||
1757 | movzx ebx,word[eax+config_s.max_lazy] |
||
1758 | mov [edi+deflate_state.max_lazy_match],ebx |
||
1759 | movzx ebx,word[eax+config_s.good_length] |
||
1760 | mov [edi+deflate_state.good_match],ebx |
||
1761 | movzx ebx,word[eax+config_s.nice_length] |
||
1762 | mov [edi+deflate_state.nice_match],ebx |
||
1763 | movzx ebx,word[eax+config_s.max_chain] |
||
1764 | mov [edi+deflate_state.max_chain_length],ebx |
||
1765 | |||
1766 | mov dword[edi+deflate_state.strstart],0 |
||
1767 | mov dword[edi+deflate_state.block_start],0 |
||
1768 | mov dword[edi+deflate_state.lookahead],0 |
||
1769 | mov dword[edi+deflate_state.insert],0 |
||
1770 | mov dword[edi+deflate_state.prev_length],MIN_MATCH-1 |
||
1771 | mov dword[edi+deflate_state.match_length],MIN_MATCH-1 |
||
1772 | mov dword[edi+deflate_state.match_available],0 |
||
1773 | mov dword[edi+deflate_state.ins_h],0 |
||
1774 | if FASTEST eq 0 |
||
1775 | ;if ASMV |
||
1776 | ; call match_init ;initialize the asm code |
||
1777 | ;end if |
||
1778 | end if |
||
1779 | ret |
||
1780 | endp |
||
1781 | |||
1782 | ;uInt (s, cur_match) |
||
6639 | IgorA | 1783 | ; deflate_state *s |
1784 | ; IPos cur_match ;current match |
||
6617 | IgorA | 1785 | align 4 |
1786 | proc longest_match uses ebx ecx edx edi esi, s:dword, cur_match:dword |
||
1787 | if FASTEST eq 0 |
||
1788 | ; =========================================================================== |
||
1789 | ; Set match_start to the longest match starting at the given string and |
||
1790 | ; return its length. Matches shorter or equal to prev_length are discarded, |
||
1791 | ; in which case the result is equal to prev_length and match_start is |
||
1792 | ; garbage. |
||
1793 | ; IN assertions: cur_match is the head of the hash chain for the current |
||
1794 | ; string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1 |
||
1795 | ; OUT assertion: the match length is not greater than s->lookahead. |
||
1796 | |||
1797 | ;#ifndef ASMV |
||
1798 | ; For 80x86 and 680x0, an optimized version will be provided in match.asm or |
||
1799 | ; match.S. The code will be functionally equivalent. |
||
6797 | IgorA | 1800 | locals |
1801 | chain_length dd ? ;unsigned ;max hash chain length |
||
1802 | len dd ? ;int ;length of current match |
||
1803 | strend dd ? ;Bytef * |
||
1804 | best_len dd ? ;int ;best match length so far |
||
1805 | nice_match dd ? ;int ;stop if match long enough |
||
1806 | limit dd NIL ;IPos |
||
1807 | prev dd ? ;Posf * |
||
1808 | wmask dd ? ;uInt |
||
1809 | endl |
||
1810 | mov edx,[s] |
||
1811 | mov eax,[edx+deflate_state.max_chain_length] |
||
1812 | mov [chain_length],eax |
||
1813 | mov edi,[edx+deflate_state.window] |
||
1814 | add edi,[edx+deflate_state.strstart] |
||
1815 | ;edi - Bytef *scan ;current string |
||
1816 | ;esi - Bytef *match ;matched string |
||
1817 | mov eax,[edx+deflate_state.prev_length] |
||
1818 | mov [best_len],eax |
||
1819 | mov eax,[edx+deflate_state.nice_match] |
||
1820 | mov [nice_match],eax |
||
6617 | IgorA | 1821 | |
6797 | IgorA | 1822 | MAX_DIST edx |
1823 | cmp [edx+deflate_state.strstart],eax |
||
1824 | jle @f |
||
1825 | mov ecx,[edx+deflate_state.strstart] |
||
1826 | sub ecx,eax |
||
1827 | mov [limit],ecx |
||
1828 | @@: |
||
6617 | IgorA | 1829 | ; Stop when cur_match becomes <= limit. To simplify the code, |
1830 | ; we prevent matches with the string of window index 0. |
||
6797 | IgorA | 1831 | mov eax,[edx+deflate_state.prev] |
1832 | mov [prev],eax |
||
1833 | mov eax,[edx+deflate_state.w_mask] |
||
1834 | mov [wmask],eax |
||
1835 | mov eax,edi |
||
1836 | add eax,MAX_MATCH ;-1 ??? |
||
1837 | mov [strend],eax |
||
1838 | mov eax,[best_len] |
||
1839 | dec eax |
||
1840 | mov bx,[edi+eax] |
||
1841 | ;bl - Byte scan_end1 |
||
1842 | ;bh - Byte scan_end |
||
6617 | IgorA | 1843 | |
1844 | ; The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. |
||
1845 | ; It is easy to get rid of this optimization if necessary. |
||
1846 | |||
6797 | IgorA | 1847 | if MAX_MATCH <> 258 |
1848 | cmp dword[edx+deflate_state.hash_bits],8 |
||
1849 | jge @f |
||
1850 | zlib_assert 'Code too clever' ;Assert(..>=.. && ..==..) |
||
1851 | @@: |
||
1852 | end if |
||
6617 | IgorA | 1853 | |
1854 | ; Do not waste too much time if we already have a good match: |
||
6797 | IgorA | 1855 | mov eax,[edx+deflate_state.good_match] |
1856 | cmp [edx+deflate_state.prev_length],eax |
||
1857 | jl @f ;if (..>=..) |
||
1858 | shr dword[chain_length],2 |
||
1859 | @@: |
||
6617 | IgorA | 1860 | ; Do not look for matches beyond the end of the input. This is necessary |
1861 | ; to make deflate deterministic. |
||
1862 | |||
6797 | IgorA | 1863 | mov eax,[edx+deflate_state.lookahead] |
1864 | cmp dword[nice_match],eax |
||
1865 | jle @f ;if (..>..) |
||
1866 | mov [nice_match],eax |
||
1867 | @@: |
||
6617 | IgorA | 1868 | |
6797 | IgorA | 1869 | mov eax,[edx+deflate_state.window_size] |
1870 | sub eax,MIN_LOOKAHEAD |
||
1871 | cmp [edx+deflate_state.strstart],eax |
||
1872 | jle .cycle0 |
||
1873 | zlib_assert 'need lookahead' ;Assert(..<=..) |
||
6617 | IgorA | 1874 | |
6797 | IgorA | 1875 | align 4 |
1876 | .cycle0: ;do |
||
1877 | mov eax,[edx+deflate_state.strstart] |
||
1878 | cmp [cur_match],eax |
||
1879 | jl @f |
||
1880 | zlib_assert 'no future' ;Assert(..<..) |
||
1881 | @@: |
||
1882 | mov esi,[edx+deflate_state.window] |
||
1883 | add esi,[cur_match] |
||
6617 | IgorA | 1884 | |
6797 | IgorA | 1885 | ; Skip to next match if the match length cannot increase |
1886 | ; or if the match length is less than 2. Note that the checks below |
||
1887 | ; for insufficient lookahead only occur occasionally for performance |
||
1888 | ; reasons. Therefore uninitialized memory will be accessed, and |
||
1889 | ; conditional jumps will be made that depend on those values. |
||
1890 | ; However the length of the match is limited to the lookahead, so |
||
1891 | ; the output of deflate is not affected by the uninitialized values. |
||
6617 | IgorA | 1892 | |
6797 | IgorA | 1893 | mov eax,[best_len] |
1894 | dec eax |
||
1895 | cmp word[esi+eax],bx |
||
1896 | jne .cycle0cont |
||
1897 | mov al,byte[esi] |
||
1898 | cmp al,byte[edi] |
||
1899 | jne .cycle0cont |
||
1900 | inc esi |
||
1901 | mov al,byte[esi] |
||
1902 | cmp al,[edi+1] |
||
1903 | jne .cycle0cont ;if (..!=.. || ..!=.. || ..!=.. || ..!=..) continue |
||
6617 | IgorA | 1904 | |
6797 | IgorA | 1905 | ; The check at best_len-1 can be removed because it will be made |
1906 | ; again later. (This heuristic is not always a win.) |
||
1907 | ; It is not necessary to compare scan[2] and match[2] since they |
||
1908 | ; are always equal when the other bytes match, given that |
||
1909 | ; the hash keys are equal and that HASH_BITS >= 8. |
||
6617 | IgorA | 1910 | |
6797 | IgorA | 1911 | add edi,2 |
1912 | inc esi |
||
1913 | mov al,byte[edi] |
||
1914 | cmp al,byte[esi] |
||
1915 | je @f |
||
1916 | zlib_assert 'match[2]?' ;Assert(..==..) |
||
1917 | @@: |
||
6617 | IgorA | 1918 | |
6797 | IgorA | 1919 | ; We check for insufficient lookahead only every 8th comparison; |
1920 | ; the 256th check will be made at strstart+258. |
||
6617 | IgorA | 1921 | |
6797 | IgorA | 1922 | inc edi |
1923 | inc esi |
||
1924 | mov ecx,[strend] |
||
1925 | sub ecx,edi |
||
1926 | jz @f |
||
1927 | repe cmpsb |
||
6799 | IgorA | 1928 | dec edi |
1929 | dec esi |
||
6797 | IgorA | 1930 | @@: |
6617 | IgorA | 1931 | |
6797 | IgorA | 1932 | mov eax,[edx+deflate_state.window_size] |
1933 | dec eax |
||
1934 | add eax,[edx+deflate_state.window] |
||
1935 | cmp edi,eax |
||
1936 | jle @f |
||
1937 | zlib_assert 'wild scan' ;Assert(..<=..) |
||
1938 | @@: |
||
6617 | IgorA | 1939 | |
6797 | IgorA | 1940 | mov eax,MAX_MATCH |
1941 | add eax,edi |
||
1942 | sub eax,[strend] |
||
1943 | mov [len],eax |
||
1944 | mov edi,[strend] |
||
1945 | sub edi,MAX_MATCH |
||
6617 | IgorA | 1946 | |
6797 | IgorA | 1947 | mov eax,[best_len] |
1948 | cmp [len],eax |
||
1949 | jle .cycle0cont ;if (..>..) |
||
1950 | mov eax,[cur_match] |
||
1951 | mov [edx+deflate_state.match_start],eax |
||
1952 | mov eax,[len] |
||
1953 | mov [best_len],eax |
||
1954 | mov eax,[nice_match] |
||
1955 | cmp [len],eax |
||
1956 | jge .cycle0end ;if (..>=..) break |
||
1957 | mov eax,[best_len] |
||
1958 | dec eax |
||
1959 | mov bx,[edi+eax] |
||
6617 | IgorA | 1960 | |
6797 | IgorA | 1961 | .cycle0cont: |
1962 | mov eax,[cur_match] |
||
1963 | and eax,[wmask] |
||
1964 | shl eax,2 |
||
1965 | add eax,[prev] |
||
1966 | mov eax,[eax] ;eax = prev[cur_match & wmask] |
||
1967 | mov [cur_match],eax |
||
1968 | cmp eax,[limit] |
||
1969 | jle .cycle0end |
||
1970 | dec dword[chain_length] |
||
1971 | cmp dword[chain_length],0 |
||
1972 | jne .cycle0 |
||
6799 | IgorA | 1973 | align 4 |
6797 | IgorA | 1974 | .cycle0end: ;while (..>.. && ..!=0) |
6617 | IgorA | 1975 | |
6797 | IgorA | 1976 | mov eax,[edx+deflate_state.lookahead] |
1977 | cmp [best_len],eax |
||
1978 | jg @f ;if (..<=..) |
||
1979 | mov eax,[best_len] |
||
1980 | @@: |
||
1981 | ;end if ;ASMV |
||
1982 | |||
6617 | IgorA | 1983 | else ;FASTEST |
1984 | |||
1985 | ; --------------------------------------------------------------------------- |
||
1986 | ; Optimized version for FASTEST only |
||
1987 | mov edx,[s] |
||
6639 | IgorA | 1988 | zlib_debug 'longest_match' |
6617 | IgorA | 1989 | |
1990 | ; The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16. |
||
1991 | ; It is easy to get rid of this optimization if necessary. |
||
1992 | |||
1993 | if MAX_MATCH <> 258 |
||
1994 | cmp dword[edx+deflate_state.hash_bits],8 |
||
1995 | jge @f |
||
6639 | IgorA | 1996 | zlib_assert 'Code too clever' ;Assert(..>=.. && ..==..) |
6617 | IgorA | 1997 | @@: |
1998 | end if |
||
1999 | mov eax,[edx+deflate_state.window_size] |
||
2000 | sub eax,MIN_LOOKAHEAD |
||
2001 | cmp [edx+deflate_state.strstart],eax |
||
2002 | jle @f |
||
6639 | IgorA | 2003 | zlib_assert 'need lookahead' ;Assert(..<=..) |
6617 | IgorA | 2004 | @@: |
2005 | mov eax,[edx+deflate_state.strstart] |
||
2006 | cmp [cur_match],eax |
||
2007 | jl @f |
||
6639 | IgorA | 2008 | zlib_assert 'no future' ;Assert(..<..) |
6617 | IgorA | 2009 | @@: |
2010 | |||
2011 | mov esi,[edx+deflate_state.window] |
||
2012 | mov edi,esi |
||
2013 | add esi,[cur_match] |
||
2014 | add edi,[edx+deflate_state.strstart] |
||
2015 | ;edi = scan |
||
2016 | ;esi = match |
||
2017 | |||
2018 | ; Return failure if the match length is less than 2: |
||
2019 | |||
2020 | lodsw |
||
2021 | cmp ax,word[edi] |
||
2022 | je @f ;if (word[edi] != word[esi]) return |
||
2023 | mov eax,MIN_MATCH-1 |
||
2024 | jmp .end_f |
||
2025 | @@: |
||
2026 | |||
2027 | ; The check at best_len-1 can be removed because it will be made |
||
2028 | ; again later. (This heuristic is not always a win.) |
||
2029 | ; It is not necessary to compare scan[2] and match[2] since they |
||
2030 | ; are always equal when the other bytes match, given that |
||
2031 | ; the hash keys are equal and that HASH_BITS >= 8. |
||
2032 | |||
2033 | add edi,2 |
||
2034 | mov al,byte[edi] |
||
2035 | cmp al,byte[esi] |
||
2036 | je @f |
||
6639 | IgorA | 2037 | zlib_assert 'match[2]?' ;Assert(..==..) |
6617 | IgorA | 2038 | @@: |
2039 | |||
2040 | ; We check for insufficient lookahead only every 8th comparison; |
||
2041 | ; the 256th check will be made at strstart+258. |
||
2042 | |||
2043 | mov ebx,edi |
||
2044 | mov ecx,MAX_MATCH |
||
2045 | align 4 |
||
2046 | @@: |
||
2047 | lodsb |
||
2048 | scasb |
||
2049 | loope @b |
||
2050 | |||
2051 | mov eax,[edx+deflate_state.window_size] |
||
2052 | dec eax |
||
2053 | add eax,[edx+deflate_state.window] |
||
2054 | cmp edi,eax |
||
2055 | jle @f |
||
6639 | IgorA | 2056 | zlib_assert 'wild scan' ;Assert(..<=..) |
6617 | IgorA | 2057 | @@: |
2058 | sub edi,ebx |
||
2059 | ;edi = len |
||
2060 | |||
2061 | cmp edi,MIN_MATCH |
||
2062 | jge @f ;if (..<..) |
||
2063 | mov eax,MIN_MATCH-1 |
||
2064 | jmp .end_f |
||
2065 | @@: |
||
2066 | mov eax,[cur_match] |
||
2067 | mov [edx+deflate_state.match_start],eax |
||
2068 | mov eax,[edx+deflate_state.lookahead] |
||
2069 | cmp edi,eax |
||
2070 | jg @f ;if (len <= s.lookahead) ? len : s.lookahead |
||
2071 | mov eax,edi |
||
2072 | @@: |
||
2073 | end if ;FASTEST |
||
2074 | .end_f: |
||
2075 | ;zlib_debug ' longest_match.ret = %d',eax |
||
2076 | ret |
||
2077 | endp |
||
2078 | |||
2079 | |||
2080 | ; =========================================================================== |
||
2081 | ; Check that the match at match_start is indeed a match. |
||
2082 | |||
2083 | ;void (s, start, match, length) |
||
6639 | IgorA | 2084 | ; deflate_state *s |
2085 | ; IPos start, match |
||
2086 | ; int length |
||
6617 | IgorA | 2087 | align 4 |
2088 | proc check_match, s:dword, start:dword, p3match:dword, length:dword |
||
2089 | if DEBUG eq 1 |
||
2090 | ; check that the match is indeed a match |
||
2091 | ; if (zmemcmp(s->window + match, |
||
2092 | ; s->window + start, length) != EQUAL) { |
||
2093 | ; fprintf(stderr, " start %u, match %u, length %d\n", |
||
2094 | ; start, match, length); |
||
2095 | ; do { |
||
2096 | ; fprintf(stderr, "%c%c", s->window[match++], s->window[start++]); |
||
2097 | ; } while (--length != 0); |
||
2098 | ; z_error("invalid match"); |
||
2099 | ; } |
||
2100 | ; if (z_verbose > 1) { |
||
2101 | ; fprintf(stderr,"\\[%d,%d]", start-match, length); |
||
2102 | ; do { putc(s->window[start++], stderr); } while (--length != 0); |
||
2103 | ; } |
||
2104 | end if ;DEBUG |
||
2105 | ret |
||
2106 | endp |
||
2107 | |||
2108 | |||
2109 | ; =========================================================================== |
||
2110 | ; Fill the window when the lookahead becomes insufficient. |
||
2111 | ; Updates strstart and lookahead. |
||
2112 | |||
2113 | ; IN assertion: lookahead < MIN_LOOKAHEAD |
||
2114 | ; OUT assertions: strstart <= window_size-MIN_LOOKAHEAD |
||
2115 | ; At least one byte has been read, or avail_in == 0; reads are |
||
2116 | ; performed for at least two bytes (required for the zip translate_eol |
||
2117 | ; option -- not supported here). |
||
2118 | |||
2119 | ;void (s) |
||
2120 | ; deflate_state *s |
||
2121 | align 4 |
||
2122 | proc fill_window, s:dword |
||
2123 | pushad |
||
2124 | ;esi = p, str, curr |
||
2125 | ;ebx = more ;Amount of free space at the end of the window. |
||
2126 | ;Объем свободного пространства в конце окна. |
||
2127 | ;ecx = wsize ;uInt |
||
2128 | ;edx = s.strm |
||
6639 | IgorA | 2129 | zlib_debug 'fill_window' |
6617 | IgorA | 2130 | mov edi,[s] |
2131 | cmp dword[edi+deflate_state.lookahead],MIN_LOOKAHEAD |
||
2132 | jl @f |
||
6639 | IgorA | 2133 | zlib_assert 'already enough lookahead' ;Assert(..<..) |
6617 | IgorA | 2134 | @@: |
2135 | |||
2136 | mov ecx,[edi+deflate_state.w_size] |
||
2137 | mov edx,[edi+deflate_state.strm] |
||
2138 | .cycle0: ;do |
||
6639 | IgorA | 2139 | zlib_debug 'do' |
6617 | IgorA | 2140 | mov ebx,[edi+deflate_state.window_size] |
2141 | sub ebx,[edi+deflate_state.lookahead] |
||
2142 | sub ebx,[edi+deflate_state.strstart] |
||
2143 | |||
2144 | ; If the window is almost full and there is insufficient lookahead, |
||
2145 | ; move the upper half to the lower one to make room in the upper half. |
||
2146 | |||
2147 | MAX_DIST edi |
||
2148 | add eax,ecx |
||
2149 | cmp [edi+deflate_state.strstart],eax |
||
2150 | jl .end0 ;if (..>=..) |
||
2151 | push ecx |
||
2152 | mov eax,[edi+deflate_state.window] |
||
2153 | add eax,ecx |
||
2154 | stdcall zmemcpy, [edi+deflate_state.window], eax |
||
2155 | sub [edi+deflate_state.match_start],ecx |
||
2156 | sub [edi+deflate_state.strstart],ecx ;we now have strstart >= MAX_DIST |
||
2157 | sub [edi+deflate_state.block_start],ecx |
||
2158 | |||
2159 | ; Slide the hash table (could be avoided with 32 bit values |
||
2160 | ; at the expense of memory usage). We slide even when level == 0 |
||
2161 | ; to keep the hash table consistent if we switch back to level > 0 |
||
2162 | ; later. (Using level 0 permanently is not an optimal usage of |
||
2163 | ; zlib, so we don't care about this pathological case.) |
||
2164 | |||
2165 | push ebx ecx |
||
2166 | ;ebx = wsize |
||
2167 | ;ecx = n |
||
2168 | mov ebx,ecx |
||
2169 | mov ecx,[edi+deflate_state.hash_size] |
||
2170 | mov esi,ecx |
||
2171 | shl esi,2 |
||
2172 | add esi,[edi+deflate_state.head] |
||
2173 | .cycle1: ;do |
||
2174 | sub esi,4 |
||
2175 | mov eax,[esi] |
||
2176 | mov dword[esi],NIL |
||
2177 | cmp eax,ebx |
||
2178 | jl @f |
||
2179 | sub eax,ebx |
||
2180 | mov dword[esi],eax |
||
2181 | @@: |
||
2182 | loop .cycle1 ;while (..) |
||
2183 | |||
6797 | IgorA | 2184 | if FASTEST eq 0 |
6617 | IgorA | 2185 | mov ecx,ebx |
2186 | mov esi,ecx |
||
2187 | shl esi,2 |
||
2188 | add esi,[edi+deflate_state.prev] |
||
2189 | .cycle2: ;do |
||
2190 | sub esi,4 |
||
2191 | mov eax,[esi] |
||
2192 | mov dword[esi],NIL |
||
2193 | cmp eax,ebx |
||
2194 | jl @f |
||
2195 | sub eax,ebx |
||
2196 | mov dword[esi],eax |
||
2197 | @@: |
||
2198 | ; If n is not on any hash chain, prev[n] is garbage but |
||
2199 | ; its value will never be used. |
||
2200 | |||
2201 | loop .cycle2 ;while (..) |
||
2202 | end if |
||
2203 | pop ecx ebx |
||
2204 | add ebx,ecx |
||
2205 | .end0: |
||
6704 | IgorA | 2206 | cmp dword[edx+z_stream.avail_in],0 |
6617 | IgorA | 2207 | je .cycle0end ;if (..==0) break |
2208 | |||
2209 | ; If there was no sliding: |
||
2210 | ; strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 && |
||
2211 | ; more == window_size - lookahead - strstart |
||
2212 | ; => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1) |
||
2213 | ; => more >= window_size - 2*WSIZE + 2 |
||
2214 | ; In the BIG_MEM or MMAP case (not yet supported), |
||
2215 | ; window_size == input_size + MIN_LOOKAHEAD && |
||
2216 | ; strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD. |
||
2217 | ; Otherwise, window_size == 2*WSIZE so more >= 2. |
||
2218 | ; If there was sliding, more >= WSIZE. So in all cases, more >= 2. |
||
2219 | |||
2220 | cmp ebx,2 |
||
2221 | jge @f |
||
6639 | IgorA | 2222 | zlib_assert 'more < 2' ;Assert(..>=..) |
6617 | IgorA | 2223 | @@: |
2224 | mov eax,[edi+deflate_state.window] |
||
2225 | add eax,[edi+deflate_state.strstart] |
||
2226 | add eax,[edi+deflate_state.lookahead] |
||
2227 | stdcall read_buf, edx, eax, ebx |
||
2228 | add [edi+deflate_state.lookahead],eax |
||
2229 | |||
2230 | ; Initialize the hash value now that we have some input: |
||
2231 | mov eax,[edi+deflate_state.lookahead] |
||
2232 | add eax,[edi+deflate_state.insert] |
||
2233 | cmp eax,MIN_MATCH |
||
2234 | jl .end1 ;if (..>=..) |
||
2235 | mov esi,[edi+deflate_state.strstart] |
||
2236 | sub esi,[edi+deflate_state.insert] |
||
2237 | ;esi = str |
||
2238 | mov eax,[edi+deflate_state.window] |
||
2239 | add eax,esi |
||
2240 | mov [edi+deflate_state.ins_h],eax |
||
2241 | inc eax |
||
2242 | movzx eax,byte[eax] |
||
2243 | UPDATE_HASH edi, [edi+deflate_state.ins_h], eax |
||
2244 | if MIN_MATCH <> 3 |
||
2245 | ; Call UPDATE_HASH() MIN_MATCH-3 more times |
||
2246 | end if |
||
2247 | .cycle3: ;while (..) |
||
2248 | cmp dword[edi+deflate_state.insert],0 |
||
2249 | je .end1 |
||
2250 | mov eax,esi |
||
2251 | add eax,MIN_MATCH-1 |
||
2252 | add eax,[edi+deflate_state.window] |
||
2253 | movzx eax,byte[eax] |
||
2254 | UPDATE_HASH edi, [edi+deflate_state.ins_h], eax |
||
2255 | if FASTEST eq 0 |
||
2256 | mov eax,[edi+deflate_state.ins_h] |
||
2257 | shl eax,2 |
||
2258 | add eax,[edi+deflate_state.head] |
||
2259 | push ebx |
||
2260 | mov ebx,[edi+deflate_state.w_mask] |
||
2261 | and ebx,esi |
||
2262 | shl ebx,2 |
||
2263 | add ebx,[edi+deflate_state.prev] |
||
2264 | mov eax,[eax] |
||
2265 | mov [ebx],eax |
||
2266 | pop ebx |
||
2267 | end if |
||
2268 | mov eax,[edi+deflate_state.ins_h] |
||
2269 | shl eax,2 |
||
2270 | add eax,[edi+deflate_state.head] |
||
2271 | mov [eax],esi |
||
2272 | inc esi |
||
2273 | dec dword[edi+deflate_state.insert] |
||
2274 | mov eax,[edi+deflate_state.lookahead] |
||
2275 | add eax,[edi+deflate_state.insert] |
||
2276 | cmp eax,MIN_MATCH |
||
2277 | jl .end1 ;if (..<..) break |
||
2278 | jmp .cycle3 |
||
2279 | .end1: |
||
2280 | ; If the whole input has less than MIN_MATCH bytes, ins_h is garbage, |
||
2281 | ; but this is not important since only literal bytes will be emitted. |
||
2282 | |||
2283 | cmp dword[edi+deflate_state.lookahead],MIN_LOOKAHEAD |
||
2284 | jge .cycle0end |
||
6704 | IgorA | 2285 | cmp dword[edx+z_stream.avail_in],0 |
6617 | IgorA | 2286 | jne .cycle0 |
6799 | IgorA | 2287 | align 4 |
6617 | IgorA | 2288 | .cycle0end: ;while (..<.. && ..!=..) |
2289 | |||
2290 | ; If the WIN_INIT bytes after the end of the current data have never been |
||
2291 | ; written, then zero those bytes in order to avoid memory check reports of |
||
2292 | ; the use of uninitialized (or uninitialised as Julian writes) bytes by |
||
2293 | ; the longest match routines. Update the high water mark for the next |
||
2294 | ; time through here. WIN_INIT is set to MAX_MATCH since the longest match |
||
2295 | ; routines allow scanning to strstart + MAX_MATCH, ignoring lookahead. |
||
2296 | |||
2297 | mov eax,[edi+deflate_state.window_size] |
||
2298 | cmp [edi+deflate_state.high_water],eax |
||
2299 | jge .end2 ;if (..<..) |
||
2300 | mov esi,[edi+deflate_state.lookahead] |
||
2301 | add esi,[edi+deflate_state.strstart] |
||
2302 | ;esi = curr |
||
2303 | |||
2304 | cmp [edi+deflate_state.high_water],esi |
||
2305 | jge .end3 ;if (..<..) |
||
2306 | ; Previous high water mark below current data -- zero WIN_INIT |
||
2307 | ; bytes or up to end of window, whichever is less. |
||
2308 | |||
2309 | mov eax,[edi+deflate_state.window_size] |
||
2310 | sub eax,esi |
||
2311 | cmp eax,WIN_INIT |
||
2312 | jle @f ;if (..>..) |
||
2313 | mov eax,WIN_INIT |
||
2314 | @@: |
||
2315 | mov edx,[edi+deflate_state.window] |
||
2316 | add edx,esi |
||
2317 | stdcall zmemzero, edx, eax |
||
2318 | add eax,esi |
||
2319 | mov [edi+deflate_state.high_water],eax |
||
2320 | jmp .end2 |
||
2321 | .end3: ;else if (..<..) |
||
2322 | mov eax,esi |
||
2323 | add eax,WIN_INIT |
||
2324 | cmp [edi+deflate_state.high_water],eax |
||
2325 | jge .end2 |
||
2326 | ; High water mark at or above current data, but below current data |
||
2327 | ; plus WIN_INIT -- zero out to current data plus WIN_INIT, or up |
||
2328 | ; to end of window, whichever is less. |
||
2329 | |||
2330 | ;eax = esi+WIN_INIT |
||
2331 | sub eax,[edi+deflate_state.high_water] |
||
2332 | mov edx,[edi+deflate_state.window_size] |
||
2333 | sub edx,[edi+deflate_state.high_water] |
||
2334 | cmp eax,edx ;if (..>..) |
||
2335 | jle @f |
||
2336 | mov eax,edx |
||
2337 | @@: |
||
2338 | mov edx,[edi+deflate_state.window] |
||
2339 | add edx,[edi+deflate_state.high_water] |
||
2340 | stdcall zmemzero, edx, eax |
||
2341 | add [edi+deflate_state.high_water],eax |
||
2342 | .end2: |
||
2343 | |||
2344 | mov eax,[edi+deflate_state.window_size] |
||
2345 | sub eax,MIN_LOOKAHEAD |
||
2346 | cmp [edi+deflate_state.strstart],eax |
||
2347 | jle @f |
||
6639 | IgorA | 2348 | zlib_assert 'not enough room for search' ;Assert(..<=..) |
6617 | IgorA | 2349 | @@: |
2350 | popad |
||
2351 | ret |
||
2352 | endp |
||
2353 | |||
2354 | ; =========================================================================== |
||
2355 | ; Flush the current block, with given end-of-file flag. |
||
2356 | ; IN assertion: strstart is set to the end of the current match. |
||
2357 | |||
2358 | macro FLUSH_BLOCK_ONLY s, last |
||
2359 | { |
||
2360 | local .end0 |
||
2361 | push dword last |
||
2362 | mov eax,[s+deflate_state.strstart] |
||
2363 | sub eax,[s+deflate_state.block_start] |
||
2364 | push eax |
||
2365 | xor eax,eax |
||
2366 | cmp dword[s+deflate_state.block_start],0 |
||
2367 | jl .end0 |
||
2368 | mov eax,[s+deflate_state.block_start] |
||
2369 | add eax,[s+deflate_state.window] |
||
2370 | .end0: |
||
2371 | stdcall _tr_flush_block, s, eax |
||
2372 | mov eax,[s+deflate_state.strstart] |
||
2373 | mov [s+deflate_state.block_start],eax |
||
2374 | stdcall flush_pending, [s+deflate_state.strm] |
||
2375 | ; Tracev((stderr,"[FLUSH]")); |
||
2376 | } |
||
2377 | |||
2378 | ; Same but force premature exit if necessary. |
||
2379 | macro FLUSH_BLOCK s, last |
||
2380 | { |
||
2381 | local .end0 |
||
2382 | FLUSH_BLOCK_ONLY s, last |
||
2383 | mov eax,[s+deflate_state.strm] |
||
6797 | IgorA | 2384 | cmp dword[eax+z_stream.avail_out],0 |
6617 | IgorA | 2385 | jne .end0 ;if (..==0) |
2386 | if last eq 1 |
||
2387 | mov eax,finish_started |
||
2388 | else |
||
2389 | mov eax,need_more |
||
2390 | end if |
||
2391 | jmp .end_f |
||
2392 | .end0: |
||
2393 | } |
||
2394 | |||
2395 | ; =========================================================================== |
||
2396 | ; Copy without compression as much as possible from the input stream, return |
||
2397 | ; the current block state. |
||
2398 | ; This function does not insert new strings in the dictionary since |
||
2399 | ; uncompressible data is probably not useful. This function is used |
||
2400 | ; only for the level=0 compression option. |
||
2401 | ; NOTE: this function should be optimized to avoid extra copying from |
||
2402 | ; window to pending_buf. |
||
2403 | |||
2404 | ;block_state (s, flush) |
||
6639 | IgorA | 2405 | ; deflate_state *s |
2406 | ; int flush |
||
6617 | IgorA | 2407 | align 4 |
2408 | proc deflate_stored uses ebx ecx edi, s:dword, flush:dword |
||
2409 | ; Stored blocks are limited to 0xffff bytes, pending_buf is limited |
||
2410 | ; to pending_buf_size, and each stored block has a 5 byte header: |
||
2411 | mov edi,[s] |
||
6799 | IgorA | 2412 | zlib_debug 'deflate_stored' |
6617 | IgorA | 2413 | |
2414 | mov ecx,0xffff |
||
2415 | mov eax,[edi+deflate_state.pending_buf_size] |
||
2416 | sub eax,5 |
||
2417 | cmp ecx,eax |
||
6799 | IgorA | 2418 | jle .cycle0 ;if (..>..) |
6617 | IgorA | 2419 | mov ecx,eax |
2420 | ;ecx = max_block_size |
||
2421 | |||
2422 | ; Copy as much as possible from input to output: |
||
6799 | IgorA | 2423 | align 4 |
6617 | IgorA | 2424 | .cycle0: ;for (;;) { |
2425 | ; Fill the window as much as possible: |
||
2426 | cmp dword[edi+deflate_state.lookahead],1 |
||
2427 | jg .end0 ;if (..<=..) |
||
2428 | ; Assert(s->strstart < s->w_size+MAX_DIST(s) || |
||
2429 | ; s->block_start >= (long)s->w_size, "slide too late"); |
||
2430 | |||
2431 | stdcall fill_window, edi |
||
2432 | cmp dword[edi+deflate_state.lookahead],0 |
||
2433 | jne @f |
||
2434 | cmp dword[flush],Z_NO_FLUSH |
||
2435 | jne @f ;if (..==0 && ..==..) |
||
2436 | mov eax,need_more |
||
2437 | jmp .end_f |
||
2438 | @@: |
||
2439 | cmp dword[edi+deflate_state.lookahead],0 |
||
2440 | je .cycle0end ;if (..==0) break ;flush the current block |
||
2441 | .end0: |
||
6799 | IgorA | 2442 | cmp dword[edi+deflate_state.block_start],0 |
2443 | jge @f |
||
2444 | zlib_assert 'block gone' ;Assert(..>=0) |
||
2445 | @@: |
||
6617 | IgorA | 2446 | |
2447 | mov eax,[edi+deflate_state.lookahead] |
||
2448 | add [edi+deflate_state.strstart],eax |
||
2449 | mov dword[edi+deflate_state.lookahead],0 |
||
2450 | |||
2451 | ; Emit a stored block if pending_buf will be full: |
||
2452 | mov ebx,[edi+deflate_state.block_start] |
||
2453 | add ebx,ecx |
||
2454 | cmp dword[edi+deflate_state.strstart],0 |
||
2455 | je @f |
||
2456 | cmp [edi+deflate_state.strstart],ebx |
||
2457 | jl .end1 |
||
2458 | @@: ;if (..==0 || ..>=..) |
||
2459 | ; strstart == 0 is possible when wraparound on 16-bit machine |
||
2460 | mov eax,[edi+deflate_state.strstart] |
||
2461 | sub eax,ebx |
||
2462 | mov [edi+deflate_state.lookahead],eax |
||
2463 | mov [edi+deflate_state.strstart],ebx |
||
2464 | FLUSH_BLOCK edi, 0 |
||
2465 | .end1: |
||
2466 | ; Flush if we may have to slide, otherwise block_start may become |
||
2467 | ; negative and the data will be gone: |
||
2468 | |||
2469 | MAX_DIST edi |
||
2470 | mov ebx,[edi+deflate_state.strstart] |
||
2471 | sub ebx,[edi+deflate_state.block_start] |
||
2472 | cmp ebx,eax |
||
2473 | jl .cycle0 ;if (..>=..) |
||
2474 | FLUSH_BLOCK edi, 0 |
||
2475 | jmp .cycle0 |
||
2476 | align 4 |
||
2477 | .cycle0end: |
||
2478 | mov dword[edi+deflate_state.insert],0 |
||
2479 | cmp dword[flush],Z_FINISH |
||
2480 | jne @f ;if (..==..) |
||
2481 | FLUSH_BLOCK edi, 1 |
||
2482 | mov eax,finish_done |
||
2483 | jmp .end_f |
||
2484 | @@: |
||
2485 | mov eax,[edi+deflate_state.block_start] |
||
2486 | cmp [edi+deflate_state.strstart],eax |
||
2487 | jle @f ;if (..>..) |
||
2488 | FLUSH_BLOCK edi, 0 |
||
2489 | @@: |
||
2490 | mov eax,block_done |
||
2491 | .end_f: |
||
2492 | ret |
||
2493 | endp |
||
2494 | |||
2495 | ; =========================================================================== |
||
2496 | ; Compress as much as possible from the input stream, return the current |
||
2497 | ; block state. |
||
2498 | ; This function does not perform lazy evaluation of matches and inserts |
||
2499 | ; new strings in the dictionary only for unmatched strings or for short |
||
2500 | ; matches. It is used only for the fast compression options. |
||
2501 | |||
2502 | ;block_state (s, flush) |
||
2503 | ; deflate_state *s |
||
2504 | ; int flush |
||
2505 | align 4 |
||
2506 | proc deflate_fast uses ebx ecx edi, s:dword, flush:dword |
||
2507 | locals |
||
2508 | bflush dd ? ;int ;set if current block must be flushed |
||
2509 | endl |
||
2510 | ;ecx = hash_head ;IPos ;head of the hash chain |
||
2511 | mov edi,[s] |
||
6652 | IgorA | 2512 | zlib_debug 'deflate_fast' |
6617 | IgorA | 2513 | |
2514 | .cycle0: ;for (..) |
||
2515 | ; Make sure that we always have enough lookahead, except |
||
2516 | ; at the end of the input file. We need MAX_MATCH bytes |
||
2517 | ; for the next match, plus MIN_MATCH bytes to insert the |
||
2518 | ; string following the next match. |
||
2519 | |||
2520 | cmp dword[edi+deflate_state.lookahead],MIN_LOOKAHEAD |
||
2521 | jge .end0 ;if (..<..) |
||
2522 | stdcall fill_window, edi |
||
2523 | cmp dword[edi+deflate_state.lookahead],MIN_LOOKAHEAD |
||
2524 | jge @f ;if (..<.. && ..==..) |
||
2525 | cmp dword[flush],Z_NO_FLUSH |
||
2526 | jne @f |
||
2527 | mov eax,need_more |
||
2528 | jmp .end_f |
||
2529 | align 4 |
||
2530 | @@: |
||
2531 | cmp dword[edi+deflate_state.lookahead],0 |
||
2532 | je .cycle0end ;if (..==0) break ;flush the current block |
||
2533 | align 4 |
||
2534 | .end0: |
||
2535 | |||
2536 | ; Insert the string window[strstart .. strstart+2] in the |
||
2537 | ; dictionary, and set hash_head to the head of the hash chain: |
||
2538 | |||
2539 | mov ecx,NIL |
||
2540 | cmp dword[edi+deflate_state.lookahead],MIN_MATCH |
||
2541 | jl @f ;if (..>=..) |
||
2542 | INSERT_STRING edi, [edi+deflate_state.strstart], ecx |
||
2543 | @@: |
||
2544 | |||
2545 | ; Find the longest match, discarding those <= prev_length. |
||
2546 | ; At this point we have always match_length < MIN_MATCH |
||
2547 | |||
2548 | cmp ecx,NIL |
||
2549 | je @f |
||
2550 | MAX_DIST edi |
||
2551 | mov ebx,[edi+deflate_state.strstart] |
||
2552 | sub ebx,ecx |
||
2553 | cmp ebx,eax |
||
2554 | jg @f ;if (..!=0 && ..<=..) |
||
2555 | ; To simplify the code, we prevent matches with the string |
||
2556 | ; of window index 0 (in particular we have to avoid a match |
||
2557 | ; of the string with itself at the start of the input file). |
||
2558 | |||
2559 | stdcall longest_match, edi, ecx |
||
2560 | mov [edi+deflate_state.match_length],eax |
||
2561 | ; longest_match() sets match_start |
||
2562 | @@: |
||
2563 | cmp dword[edi+deflate_state.match_length],MIN_MATCH |
||
2564 | jl .end1 ;if (..>=..) |
||
2565 | stdcall check_match, edi, [edi+deflate_state.strstart], [edi+deflate_state.match_start], [edi+deflate_state.match_length] |
||
2566 | |||
2567 | mov eax,[edi+deflate_state.strstart] |
||
2568 | sub eax,[edi+deflate_state.match_start] |
||
2569 | mov ebx,[edi+deflate_state.match_length] |
||
2570 | sub ebx,MIN_MATCH |
||
2571 | _tr_tally_dist edi, eax, ebx, [bflush] |
||
2572 | |||
2573 | mov eax,[edi+deflate_state.match_length] |
||
2574 | sub [edi+deflate_state.lookahead],eax |
||
2575 | |||
2576 | ; Insert new strings in the hash table only if the match length |
||
2577 | ; is not too large. This saves time but degrades compression. |
||
2578 | |||
2579 | if FASTEST eq 0 |
||
2580 | ;;mov eax,[edi+deflate_state.match_length] |
||
2581 | cmp eax,[edi+deflate_state.max_insert_length] |
||
2582 | jg .end3 |
||
2583 | cmp dword[edi+deflate_state.lookahead],MIN_MATCH |
||
2584 | jl .end3 ;if (..<=.. && ..>=..) |
||
2585 | dec dword[edi+deflate_state.match_length] ;string at strstart already in table |
||
2586 | .cycle1: ;do { |
||
2587 | inc dword[edi+deflate_state.strstart] |
||
2588 | INSERT_STRING edi, [edi+deflate_state.strstart], ecx |
||
2589 | ; strstart never exceeds WSIZE-MAX_MATCH, so there are |
||
2590 | ; always MIN_MATCH bytes ahead. |
||
2591 | |||
2592 | dec dword[edi+deflate_state.match_length] |
||
2593 | cmp dword[edi+deflate_state.match_length],0 |
||
2594 | jne .cycle1 ;while (..!=0) |
||
2595 | inc dword[edi+deflate_state.strstart] |
||
2596 | jmp .end2 |
||
2597 | .end3: ;else |
||
2598 | end if |
||
2599 | |||
2600 | mov eax,[edi+deflate_state.match_length] |
||
2601 | add [edi+deflate_state.strstart],eax |
||
2602 | mov dword[edi+deflate_state.match_length],0 |
||
2603 | mov eax,[edi+deflate_state.window] |
||
2604 | add eax,[edi+deflate_state.strstart] |
||
2605 | mov [edi+deflate_state.ins_h],eax |
||
2606 | inc eax |
||
2607 | movzx eax,byte[eax] |
||
2608 | UPDATE_HASH edi, [edi+deflate_state.ins_h], eax |
||
2609 | if MIN_MATCH <> 3 |
||
2610 | ; Call UPDATE_HASH() MIN_MATCH-3 more times |
||
2611 | end if |
||
2612 | ; If lookahead < MIN_MATCH, ins_h is garbage, but it does not |
||
2613 | ; matter since it will be recomputed at next deflate call. |
||
2614 | jmp .end2 |
||
2615 | .end1: ;else |
||
2616 | ; No match, output a literal byte |
||
2617 | mov eax,[edi+deflate_state.window] |
||
2618 | add eax,[edi+deflate_state.strstart] |
||
2619 | movzx eax,byte[eax] |
||
2620 | Tracevv eax, |
||
2621 | _tr_tally_lit edi, eax, [bflush] |
||
2622 | dec dword[edi+deflate_state.lookahead] |
||
2623 | inc dword[edi+deflate_state.strstart] |
||
2624 | .end2: |
||
2625 | cmp dword[bflush],0 |
||
2626 | je .cycle0 ;if (..) |
||
2627 | FLUSH_BLOCK edi, 0 |
||
2628 | jmp .cycle0 |
||
2629 | align 4 |
||
2630 | .cycle0end: |
||
2631 | mov eax,[edi+deflate_state.strstart] |
||
2632 | cmp eax,MIN_MATCH-1 |
||
2633 | jl @f |
||
2634 | mov eax,MIN_MATCH-1 |
||
2635 | @@: |
||
2636 | mov [edi+deflate_state.insert],eax |
||
2637 | cmp dword[flush],Z_FINISH |
||
2638 | jne @f ;if (..==..) |
||
2639 | FLUSH_BLOCK edi, 1 |
||
2640 | mov eax,finish_done |
||
2641 | jmp .end_f |
||
2642 | @@: |
||
2643 | cmp dword[edi+deflate_state.last_lit],0 |
||
2644 | je @f ;if (..) |
||
2645 | FLUSH_BLOCK edi, 0 |
||
2646 | @@: |
||
2647 | mov eax,block_done |
||
2648 | .end_f: |
||
2649 | ret |
||
2650 | endp |
||
2651 | |||
2652 | ; =========================================================================== |
||
2653 | ; Same as above, but achieves better compression. We use a lazy |
||
2654 | ; evaluation for matches: a match is finally adopted only if there is |
||
2655 | ; no better match at the next window position. |
||
2656 | |||
2657 | ;block_state (s, flush) |
||
2658 | ; deflate_state *s |
||
2659 | ; int flush |
||
2660 | align 4 |
||
2661 | proc deflate_slow uses ebx ecx edx edi, s:dword, flush:dword |
||
2662 | locals |
||
2663 | bflush dd ? ;int ;set if current block must be flushed |
||
2664 | endl |
||
2665 | ;ecx = hash_head ;IPos ;head of the hash chain |
||
2666 | mov edi,[s] |
||
6652 | IgorA | 2667 | zlib_debug 'deflate_slow' |
6617 | IgorA | 2668 | |
2669 | ; Process the input block. |
||
2670 | .cycle0: ;for (;;) |
||
2671 | ; Make sure that we always have enough lookahead, except |
||
2672 | ; at the end of the input file. We need MAX_MATCH bytes |
||
2673 | ; for the next match, plus MIN_MATCH bytes to insert the |
||
2674 | ; string following the next match. |
||
2675 | |||
2676 | cmp dword[edi+deflate_state.lookahead],MIN_LOOKAHEAD |
||
2677 | jge .end0 ;if (..<..) |
||
2678 | stdcall fill_window, edi |
||
2679 | cmp dword[edi+deflate_state.lookahead],MIN_LOOKAHEAD |
||
2680 | jge @f ;if (..<.. && ..==..) |
||
2681 | cmp dword[flush],Z_NO_FLUSH |
||
2682 | jne @f |
||
2683 | mov eax,need_more |
||
2684 | jmp .end_f |
||
2685 | align 4 |
||
2686 | @@: |
||
2687 | cmp dword[edi+deflate_state.lookahead],0 |
||
2688 | je .cycle0end ;if (..==0) break ;flush the current block |
||
2689 | align 4 |
||
2690 | .end0: |
||
2691 | |||
2692 | ; Insert the string window[strstart .. strstart+2] in the |
||
2693 | ; dictionary, and set hash_head to the head of the hash chain: |
||
2694 | |||
2695 | mov ecx,NIL |
||
2696 | cmp dword[edi+deflate_state.lookahead],MIN_MATCH |
||
2697 | jl @f ;if (..>=..) |
||
2698 | INSERT_STRING edi, [edi+deflate_state.strstart], ecx |
||
2699 | @@: |
||
2700 | |||
2701 | ; Find the longest match, discarding those <= prev_length. |
||
2702 | |||
2703 | mov eax,[edi+deflate_state.match_length] |
||
2704 | mov [edi+deflate_state.prev_length],eax |
||
2705 | mov eax,[edi+deflate_state.match_start] |
||
2706 | mov [edi+deflate_state.prev_match],eax |
||
2707 | mov dword[edi+deflate_state.match_length],MIN_MATCH-1 |
||
2708 | |||
2709 | cmp ecx,NIL |
||
6797 | IgorA | 2710 | je .end1 |
6617 | IgorA | 2711 | mov eax,[edi+deflate_state.prev_length] |
2712 | cmp eax,[edi+deflate_state.max_lazy_match] |
||
6797 | IgorA | 2713 | jge .end1 |
6617 | IgorA | 2714 | MAX_DIST edi |
2715 | mov ebx,[edi+deflate_state.strstart] |
||
2716 | sub ebx,ecx |
||
2717 | cmp ebx,eax |
||
2718 | jg .end1 ;if (..!=0 && ..<.. && ..<=..) |
||
2719 | ; To simplify the code, we prevent matches with the string |
||
2720 | ; of window index 0 (in particular we have to avoid a match |
||
2721 | ; of the string with itself at the start of the input file). |
||
2722 | |||
2723 | stdcall longest_match, edi, ecx |
||
2724 | mov [edi+deflate_state.match_length],eax |
||
2725 | ; longest_match() sets match_start |
||
2726 | |||
2727 | cmp dword[edi+deflate_state.match_length],5 |
||
2728 | jg .end1 |
||
2729 | cmp word[edi+deflate_state.strategy],Z_FILTERED |
||
6797 | IgorA | 2730 | if TOO_FAR <= 32767 |
2731 | je @f |
||
2732 | cmp dword[edi+deflate_state.match_length],MIN_MATCH |
||
2733 | jne .end1 |
||
2734 | mov eax,[edi+deflate_state.strstart] |
||
2735 | sub eax,[edi+deflate_state.match_start] |
||
2736 | cmp eax,TOO_FAR |
||
2737 | jle .end1 ;if (..<=.. && (..==.. || (..==.. && ..>..))) |
||
2738 | @@: |
||
2739 | else |
||
2740 | jne .end1 ;if (..<=.. && ..==..) |
||
2741 | end if |
||
6617 | IgorA | 2742 | ; If prev_match is also MIN_MATCH, match_start is garbage |
2743 | ; but we will ignore the current match anyway. |
||
2744 | |||
2745 | mov dword[edi+deflate_state.match_length],MIN_MATCH-1 |
||
2746 | .end1: |
||
2747 | ; If there was a match at the previous step and the current |
||
2748 | ; match is not better, output the previous match: |
||
2749 | |||
2750 | |||
2751 | mov eax,[edi+deflate_state.prev_length] |
||
2752 | cmp eax,MIN_MATCH |
||
6797 | IgorA | 2753 | jl .end2 |
6617 | IgorA | 2754 | cmp [edi+deflate_state.match_length],eax |
6797 | IgorA | 2755 | jg .end2 ;if (..>=.. && ..<=..) |
6617 | IgorA | 2756 | mov edx,[edi+deflate_state.strstart] |
2757 | add edx,[edi+deflate_state.lookahead] |
||
2758 | sub edx,MIN_MATCH |
||
2759 | ;edx = max_insert |
||
2760 | ; Do not insert strings in hash table beyond this. |
||
2761 | |||
2762 | mov eax,[edi+deflate_state.strstart] |
||
2763 | dec eax |
||
2764 | stdcall check_match, edi, eax, [edi+deflate_state.prev_match], [edi+deflate_state.prev_length] |
||
2765 | |||
2766 | mov eax,[edi+deflate_state.strstart] |
||
2767 | dec eax |
||
2768 | sub eax,[edi+deflate_state.prev_match] |
||
2769 | mov ebx,[edi+deflate_state.prev_length] |
||
2770 | sub ebx,MIN_MATCH |
||
2771 | _tr_tally_dist edi, eax, ebx, [bflush] |
||
2772 | |||
2773 | ; Insert in hash table all strings up to the end of the match. |
||
2774 | ; strstart-1 and strstart are already inserted. If there is not |
||
2775 | ; enough lookahead, the last two strings are not inserted in |
||
2776 | ; the hash table. |
||
2777 | |||
2778 | mov eax,[edi+deflate_state.prev_length] |
||
2779 | dec eax |
||
2780 | sub [edi+deflate_state.lookahead],eax |
||
2781 | sub dword[edi+deflate_state.prev_length],2 |
||
2782 | .cycle1: ;do |
||
2783 | inc dword[edi+deflate_state.strstart] |
||
2784 | cmp [edi+deflate_state.strstart],edx |
||
2785 | jg @f ;if (..<=..) |
||
2786 | INSERT_STRING edi, [edi+deflate_state.strstart], ecx |
||
2787 | @@: |
||
2788 | dec dword[edi+deflate_state.prev_length] |
||
2789 | cmp dword[edi+deflate_state.prev_length],0 |
||
2790 | jne .cycle1 ;while (..!=0) |
||
2791 | mov dword[edi+deflate_state.match_available],0 |
||
2792 | mov dword[edi+deflate_state.match_length],MIN_MATCH-1 |
||
2793 | inc dword[edi+deflate_state.strstart] |
||
2794 | |||
2795 | cmp dword[bflush],0 |
||
2796 | je .cycle0 ;if (..) |
||
2797 | FLUSH_BLOCK edi, 0 |
||
2798 | jmp .cycle0 |
||
2799 | .end2: ;else if (..) |
||
2800 | cmp dword[edi+deflate_state.match_available],0 |
||
2801 | je .end3 |
||
2802 | ; If there was no match at the previous position, output a |
||
2803 | ; single literal. If there was a match but the current match |
||
2804 | ; is longer, truncate the previous match to a single literal. |
||
2805 | |||
2806 | mov eax,[edi+deflate_state.strstart] |
||
2807 | dec eax |
||
2808 | add eax,[edi+deflate_state.window] |
||
2809 | movzx eax,byte[eax] |
||
2810 | Tracevv eax, |
||
2811 | _tr_tally_lit edi, eax, [bflush] |
||
2812 | cmp dword[bflush],0 |
||
2813 | je @f ;if (..) |
||
2814 | FLUSH_BLOCK_ONLY edi, 0 |
||
2815 | @@: |
||
2816 | inc dword[edi+deflate_state.strstart] |
||
2817 | dec dword[edi+deflate_state.lookahead] |
||
2818 | mov eax,[edi+deflate_state.strm] |
||
6797 | IgorA | 2819 | cmp dword[eax+z_stream.avail_out],0 |
6617 | IgorA | 2820 | jne .cycle0 ;if (..==0) return .. |
2821 | mov eax,need_more |
||
2822 | jmp .end_f |
||
2823 | jmp .cycle0 ;.end4 |
||
2824 | .end3: ;else |
||
2825 | ; There is no previous match to compare with, wait for |
||
2826 | ; the next step to decide. |
||
2827 | |||
2828 | mov dword[edi+deflate_state.match_available],1 |
||
2829 | inc dword[edi+deflate_state.strstart] |
||
2830 | dec dword[edi+deflate_state.lookahead] |
||
2831 | ;.end4: |
||
2832 | jmp .cycle0 |
||
6799 | IgorA | 2833 | align 4 |
6617 | IgorA | 2834 | .cycle0end: |
2835 | cmp dword[flush],Z_NO_FLUSH |
||
2836 | jne @f |
||
6639 | IgorA | 2837 | zlib_assert 'no flush?' ;Assert (..!=..) |
6617 | IgorA | 2838 | @@: |
2839 | cmp dword[edi+deflate_state.match_available],0 |
||
2840 | je @f ;if (..) |
||
2841 | mov eax,[edi+deflate_state.strstart] |
||
2842 | dec eax |
||
2843 | add eax,[edi+deflate_state.window] |
||
2844 | movzx eax,byte[eax] |
||
2845 | Tracevv eax, |
||
2846 | _tr_tally_lit edi, eax, [bflush] |
||
2847 | mov dword[edi+deflate_state.match_available],0 |
||
2848 | @@: |
||
2849 | mov eax,[edi+deflate_state.strstart] |
||
2850 | cmp eax,MIN_MATCH-1 |
||
2851 | jl @f |
||
2852 | mov eax,MIN_MATCH-1 |
||
2853 | @@: |
||
2854 | mov [edi+deflate_state.insert],eax |
||
2855 | cmp dword[flush],Z_FINISH |
||
2856 | jne @f ;if (..==..) |
||
2857 | FLUSH_BLOCK edi, 1 |
||
2858 | mov eax,finish_done |
||
2859 | jmp .end_f |
||
2860 | @@: |
||
2861 | cmp dword[edi+deflate_state.last_lit],0 |
||
2862 | je @f ;if (..) |
||
2863 | FLUSH_BLOCK edi, 0 |
||
2864 | @@: |
||
2865 | mov eax,block_done |
||
2866 | .end_f: |
||
2867 | ret |
||
2868 | endp |
||
2869 | |||
2870 | ; =========================================================================== |
||
2871 | ; For Z_RLE, simply look for runs of bytes, generate matches only of distance |
||
2872 | ; one. Do not maintain a hash table. (It will be regenerated if this run of |
||
2873 | ; deflate switches away from Z_RLE.) |
||
2874 | |||
2875 | ;block_state (s, flush) |
||
6639 | IgorA | 2876 | ; deflate_state *s |
2877 | ; int flush |
||
6617 | IgorA | 2878 | align 4 |
2879 | proc deflate_rle uses ecx edx edi esi, s:dword, flush:dword |
||
2880 | locals |
||
2881 | bflush dd ? ;int ;set if current block must be flushed |
||
2882 | endl |
||
2883 | mov edx,[s] |
||
6652 | IgorA | 2884 | zlib_debug 'deflate_rle' |
2885 | align 4 |
||
6617 | IgorA | 2886 | .cycle0: ;for (;;) |
2887 | ; Make sure that we always have enough lookahead, except |
||
2888 | ; at the end of the input file. We need MAX_MATCH bytes |
||
2889 | ; for the longest run, plus one for the unrolled loop. |
||
2890 | cmp dword[edx+deflate_state.lookahead],MAX_MATCH |
||
2891 | jg .end0 ;if (..<=..) |
||
2892 | stdcall fill_window, edx |
||
2893 | cmp dword[edx+deflate_state.lookahead],MAX_MATCH |
||
2894 | jg @f |
||
2895 | cmp dword[flush],Z_NO_FLUSH |
||
2896 | jne @f ;if (..<=.. && ..==..) |
||
2897 | mov eax,need_more |
||
2898 | jmp .end_f |
||
2899 | align 4 |
||
2900 | @@: |
||
2901 | cmp dword[edx+deflate_state.lookahead],0 |
||
2902 | je .cycle0end ;flush the current block |
||
2903 | align 4 |
||
2904 | .end0: |
||
2905 | |||
2906 | ; See how many times the previous byte repeats |
||
2907 | mov dword[edx+deflate_state.match_length],0 |
||
2908 | cmp dword[edx+deflate_state.lookahead],MIN_MATCH |
||
2909 | jl .end1 |
||
2910 | cmp dword[edx+deflate_state.strstart],0 |
||
2911 | jle .end1 ;if (..>=.. && ..>..) |
||
2912 | mov esi,[edx+deflate_state.window] |
||
2913 | add esi,[edx+deflate_state.strstart] |
||
2914 | dec esi |
||
2915 | lodsb |
||
2916 | mov edi,esi |
||
2917 | scasb |
||
2918 | jnz .end2 |
||
2919 | scasb |
||
2920 | jnz .end2 |
||
2921 | scasb |
||
2922 | jnz .end2 ;if (..==.. && ..==.. && ..==..) |
||
6652 | IgorA | 2923 | ;edi = scan ;scan goes up to strend for length of run |
2924 | ; al = prev ;byte at distance one to match |
||
6617 | IgorA | 2925 | ;ecx = strend-scan |
2926 | mov ecx,MAX_MATCH-2 |
||
2927 | repz scasb |
||
2928 | sub edi,[edx+deflate_state.window] |
||
2929 | sub edi,[edx+deflate_state.strstart] |
||
2930 | mov [edx+deflate_state.match_length],edi |
||
2931 | mov eax,[edx+deflate_state.lookahead] |
||
2932 | cmp [edx+deflate_state.match_length],eax |
||
2933 | jle .end2 |
||
2934 | mov [edx+deflate_state.match_length],eax |
||
2935 | .end2: |
||
2936 | mov eax,[edx+deflate_state.window_size] |
||
2937 | dec eax |
||
2938 | add eax,[edx+deflate_state.window] |
||
2939 | cmp edi,eax |
||
2940 | jle .end1 |
||
6639 | IgorA | 2941 | zlib_assert 'wild scan' ;Assert(..<=..) |
6617 | IgorA | 2942 | .end1: |
2943 | |||
2944 | ; Emit match if have run of MIN_MATCH or longer, else emit literal |
||
2945 | cmp dword[edx+deflate_state.match_length],MIN_MATCH |
||
2946 | jl @f ;if (..>=..) |
||
2947 | push dword[edx+deflate_state.match_length] |
||
2948 | mov eax,[edx+deflate_state.strstart] |
||
2949 | dec eax |
||
2950 | stdcall check_match, edx, [edx+deflate_state.strstart], eax |
||
2951 | |||
2952 | mov eax,[edx+deflate_state.match_length] |
||
2953 | sub eax,MIN_MATCH |
||
2954 | _tr_tally_dist edx, 1, eax, [bflush] |
||
2955 | |||
2956 | mov eax,[edx+deflate_state.match_length] |
||
2957 | sub [edx+deflate_state.lookahead],eax |
||
2958 | add [edx+deflate_state.strstart],eax |
||
2959 | mov dword[edx+deflate_state.match_length],0 |
||
2960 | jmp .end3 |
||
2961 | @@: ;else |
||
2962 | ; No match, output a literal byte |
||
2963 | mov eax,[edx+deflate_state.strstart] |
||
2964 | add eax,[edx+deflate_state.window] |
||
2965 | movzx eax,byte[eax] |
||
2966 | Tracevv eax, |
||
2967 | _tr_tally_lit edx, eax, [bflush] |
||
2968 | dec dword[edx+deflate_state.lookahead] |
||
2969 | inc dword[edx+deflate_state.strstart] |
||
2970 | .end3: |
||
2971 | cmp dword[bflush],0 |
||
2972 | je .cycle0 ;if (..) |
||
2973 | FLUSH_BLOCK edx, 0 |
||
2974 | jmp .cycle0 |
||
2975 | align 4 |
||
2976 | .cycle0end: |
||
2977 | mov dword[edx+deflate_state.insert],0 |
||
2978 | cmp dword[flush],Z_FINISH |
||
2979 | jne @f ;if (..==..) |
||
2980 | FLUSH_BLOCK edx, 1 |
||
2981 | mov eax,finish_done |
||
2982 | jmp .end_f |
||
2983 | @@: |
||
2984 | cmp dword[edx+deflate_state.last_lit],0 |
||
2985 | je @f ;if (..) |
||
2986 | FLUSH_BLOCK edx, 0 |
||
2987 | @@: |
||
2988 | mov eax,block_done |
||
2989 | .end_f: |
||
2990 | ret |
||
2991 | endp |
||
2992 | |||
2993 | ; =========================================================================== |
||
2994 | ; For Z_HUFFMAN_ONLY, do not look for matches. Do not maintain a hash table. |
||
2995 | ; (It will be regenerated if this run of deflate switches away from Huffman.) |
||
2996 | |||
2997 | ;block_state (s, flush) |
||
6639 | IgorA | 2998 | ; deflate_state *s |
2999 | ; int flush |
||
6617 | IgorA | 3000 | align 4 |
3001 | proc deflate_huff uses ebx edi, s:dword, flush:dword |
||
3002 | locals |
||
3003 | bflush dd ? ;int ;set if current block must be flushed |
||
3004 | endl |
||
3005 | mov edi,[s] |
||
6652 | IgorA | 3006 | zlib_debug 'deflate_huff' |
3007 | align 4 |
||
6617 | IgorA | 3008 | .cycle0: ;for (;;) |
3009 | ; Make sure that we have a literal to write. |
||
3010 | cmp dword[edi+deflate_state.lookahead],0 |
||
3011 | jne .end0 ;if (..==0) |
||
3012 | stdcall fill_window, edi |
||
3013 | cmp dword[edi+deflate_state.lookahead],0 |
||
3014 | jne .end0 ;if (..==0) |
||
3015 | cmp dword[flush],Z_NO_FLUSH |
||
6652 | IgorA | 3016 | jne .cycle0end ;if (..==..) |
6617 | IgorA | 3017 | mov eax,need_more |
3018 | jmp .end_f |
||
6652 | IgorA | 3019 | ;flush the current block |
6617 | IgorA | 3020 | align 4 |
3021 | .end0: |
||
3022 | |||
3023 | ; Output a literal byte |
||
3024 | mov dword[edi+deflate_state.match_length],0 |
||
3025 | mov eax,[edi+deflate_state.strstart] |
||
3026 | add eax,[edi+deflate_state.window] |
||
3027 | movzx eax,byte[eax] |
||
3028 | Tracevv eax, |
||
3029 | _tr_tally_lit edi, eax, [bflush] |
||
3030 | dec dword[edi+deflate_state.lookahead] |
||
3031 | inc dword[edi+deflate_state.strstart] |
||
3032 | cmp dword[bflush],0 |
||
3033 | je @f ;if (..) |
||
3034 | FLUSH_BLOCK edi, 0 |
||
3035 | @@: |
||
3036 | jmp .cycle0 |
||
3037 | align 4 |
||
3038 | .cycle0end: |
||
3039 | mov dword[edi+deflate_state.insert],0 |
||
3040 | cmp dword[flush],Z_FINISH |
||
3041 | jne @f ;if (..==..) |
||
3042 | FLUSH_BLOCK edi, 1 |
||
3043 | mov eax,finish_done |
||
3044 | jmp .end_f |
||
3045 | @@: |
||
3046 | cmp dword[edi+deflate_state.last_lit],0 |
||
3047 | je @f ;if (..) |
||
3048 | FLUSH_BLOCK edi, 0 |
||
3049 | @@: |
||
3050 | mov eax,block_done |
||
3051 | .end_f: |
||
3052 | ret |
||
3053 | endp=..) |