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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* gzwrite.c -- zlib functions for writing gzip files |
2 | * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler |
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3 | * For conditions of distribution and use, see copyright notice in zlib.h |
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4 | */ |
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5 | |||
6 | #include "gzguts.h" |
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7 | |||
8 | /* Local functions */ |
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9 | local int gz_init OF((gz_statep)); |
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10 | local int gz_comp OF((gz_statep, int)); |
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11 | local int gz_zero OF((gz_statep, z_off64_t)); |
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12 | |||
13 | /* Initialize state for writing a gzip file. Mark initialization by setting |
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14 | state->size to non-zero. Return -1 on failure or 0 on success. */ |
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15 | local int gz_init(state) |
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16 | gz_statep state; |
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17 | { |
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18 | int ret; |
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19 | z_streamp strm = &(state->strm); |
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20 | |||
21 | /* allocate input buffer */ |
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22 | state->in = (unsigned char *)malloc(state->want); |
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23 | if (state->in == NULL) { |
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24 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
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25 | return -1; |
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26 | } |
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27 | |||
28 | /* only need output buffer and deflate state if compressing */ |
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29 | if (!state->direct) { |
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30 | /* allocate output buffer */ |
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31 | state->out = (unsigned char *)malloc(state->want); |
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32 | if (state->out == NULL) { |
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33 | free(state->in); |
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34 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
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35 | return -1; |
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36 | } |
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37 | |||
38 | /* allocate deflate memory, set up for gzip compression */ |
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39 | strm->zalloc = Z_NULL; |
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40 | strm->zfree = Z_NULL; |
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41 | strm->opaque = Z_NULL; |
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42 | ret = deflateInit2(strm, state->level, Z_DEFLATED, |
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43 | MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy); |
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44 | if (ret != Z_OK) { |
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45 | free(state->out); |
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46 | free(state->in); |
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47 | gz_error(state, Z_MEM_ERROR, "out of memory"); |
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48 | return -1; |
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49 | } |
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50 | } |
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51 | |||
52 | /* mark state as initialized */ |
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53 | state->size = state->want; |
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54 | |||
55 | /* initialize write buffer if compressing */ |
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56 | if (!state->direct) { |
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57 | strm->avail_out = state->size; |
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58 | strm->next_out = state->out; |
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59 | state->x.next = strm->next_out; |
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60 | } |
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61 | return 0; |
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62 | } |
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63 | |||
64 | /* Compress whatever is at avail_in and next_in and write to the output file. |
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65 | Return -1 if there is an error writing to the output file, otherwise 0. |
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66 | flush is assumed to be a valid deflate() flush value. If flush is Z_FINISH, |
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67 | then the deflate() state is reset to start a new gzip stream. If gz->direct |
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68 | is true, then simply write to the output file without compressing, and |
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69 | ignore flush. */ |
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70 | local int gz_comp(state, flush) |
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71 | gz_statep state; |
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72 | int flush; |
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73 | { |
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74 | int ret, got; |
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75 | unsigned have; |
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76 | z_streamp strm = &(state->strm); |
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77 | |||
78 | /* allocate memory if this is the first time through */ |
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79 | if (state->size == 0 && gz_init(state) == -1) |
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80 | return -1; |
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81 | |||
82 | /* write directly if requested */ |
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83 | if (state->direct) { |
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84 | got = write(state->fd, strm->next_in, strm->avail_in); |
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85 | if (got < 0 || (unsigned)got != strm->avail_in) { |
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86 | gz_error(state, Z_ERRNO, zstrerror()); |
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87 | return -1; |
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88 | } |
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89 | strm->avail_in = 0; |
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90 | return 0; |
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91 | } |
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92 | |||
93 | /* run deflate() on provided input until it produces no more output */ |
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94 | ret = Z_OK; |
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95 | do { |
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96 | /* write out current buffer contents if full, or if flushing, but if |
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97 | doing Z_FINISH then don't write until we get to Z_STREAM_END */ |
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98 | if (strm->avail_out == 0 || (flush != Z_NO_FLUSH && |
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99 | (flush != Z_FINISH || ret == Z_STREAM_END))) { |
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100 | have = (unsigned)(strm->next_out - state->x.next); |
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101 | if (have && ((got = write(state->fd, state->x.next, have)) < 0 || |
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102 | (unsigned)got != have)) { |
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103 | gz_error(state, Z_ERRNO, zstrerror()); |
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104 | return -1; |
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105 | } |
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106 | if (strm->avail_out == 0) { |
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107 | strm->avail_out = state->size; |
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108 | strm->next_out = state->out; |
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109 | } |
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110 | state->x.next = strm->next_out; |
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111 | } |
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112 | |||
113 | /* compress */ |
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114 | have = strm->avail_out; |
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115 | ret = deflate(strm, flush); |
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116 | if (ret == Z_STREAM_ERROR) { |
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117 | gz_error(state, Z_STREAM_ERROR, |
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118 | "internal error: deflate stream corrupt"); |
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119 | return -1; |
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120 | } |
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121 | have -= strm->avail_out; |
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122 | } while (have); |
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123 | |||
124 | /* if that completed a deflate stream, allow another to start */ |
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125 | if (flush == Z_FINISH) |
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126 | deflateReset(strm); |
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127 | |||
128 | /* all done, no errors */ |
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129 | return 0; |
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130 | } |
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131 | |||
132 | /* Compress len zeros to output. Return -1 on error, 0 on success. */ |
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133 | local int gz_zero(state, len) |
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134 | gz_statep state; |
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135 | z_off64_t len; |
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136 | { |
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137 | int first; |
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138 | unsigned n; |
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139 | z_streamp strm = &(state->strm); |
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140 | |||
141 | /* consume whatever's left in the input buffer */ |
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142 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
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143 | return -1; |
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144 | |||
145 | /* compress len zeros (len guaranteed > 0) */ |
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146 | first = 1; |
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147 | while (len) { |
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148 | n = GT_OFF(state->size) || (z_off64_t)state->size > len ? |
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149 | (unsigned)len : state->size; |
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150 | if (first) { |
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151 | memset(state->in, 0, n); |
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152 | first = 0; |
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153 | } |
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154 | strm->avail_in = n; |
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155 | strm->next_in = state->in; |
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156 | state->x.pos += n; |
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157 | if (gz_comp(state, Z_NO_FLUSH) == -1) |
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158 | return -1; |
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159 | len -= n; |
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160 | } |
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161 | return 0; |
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162 | } |
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163 | |||
164 | /* -- see zlib.h -- */ |
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165 | int ZEXPORT gzwrite(file, buf, len) |
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166 | gzFile file; |
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167 | voidpc buf; |
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168 | unsigned len; |
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169 | { |
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170 | unsigned put = len; |
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171 | gz_statep state; |
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172 | z_streamp strm; |
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173 | |||
174 | /* get internal structure */ |
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175 | if (file == NULL) |
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176 | return 0; |
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177 | state = (gz_statep)file; |
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178 | strm = &(state->strm); |
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179 | |||
180 | /* check that we're writing and that there's no error */ |
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181 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
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182 | return 0; |
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183 | |||
184 | /* since an int is returned, make sure len fits in one, otherwise return |
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185 | with an error (this avoids the flaw in the interface) */ |
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186 | if ((int)len < 0) { |
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187 | gz_error(state, Z_DATA_ERROR, "requested length does not fit in int"); |
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188 | return 0; |
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189 | } |
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190 | |||
191 | /* if len is zero, avoid unnecessary operations */ |
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192 | if (len == 0) |
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193 | return 0; |
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194 | |||
195 | /* allocate memory if this is the first time through */ |
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196 | if (state->size == 0 && gz_init(state) == -1) |
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197 | return 0; |
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198 | |||
199 | /* check for seek request */ |
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200 | if (state->seek) { |
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201 | state->seek = 0; |
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202 | if (gz_zero(state, state->skip) == -1) |
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203 | return 0; |
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204 | } |
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205 | |||
206 | /* for small len, copy to input buffer, otherwise compress directly */ |
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207 | if (len < state->size) { |
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208 | /* copy to input buffer, compress when full */ |
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209 | do { |
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210 | unsigned have, copy; |
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211 | |||
212 | if (strm->avail_in == 0) |
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213 | strm->next_in = state->in; |
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214 | have = (unsigned)((strm->next_in + strm->avail_in) - state->in); |
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215 | copy = state->size - have; |
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216 | if (copy > len) |
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217 | copy = len; |
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218 | memcpy(state->in + have, buf, copy); |
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219 | strm->avail_in += copy; |
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220 | state->x.pos += copy; |
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221 | buf = (const char *)buf + copy; |
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222 | len -= copy; |
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223 | if (len && gz_comp(state, Z_NO_FLUSH) == -1) |
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224 | return 0; |
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225 | } while (len); |
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226 | } |
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227 | else { |
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228 | /* consume whatever's left in the input buffer */ |
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229 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
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230 | return 0; |
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231 | |||
232 | /* directly compress user buffer to file */ |
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233 | strm->avail_in = len; |
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234 | strm->next_in = (z_const Bytef *)buf; |
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235 | state->x.pos += len; |
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236 | if (gz_comp(state, Z_NO_FLUSH) == -1) |
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237 | return 0; |
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238 | } |
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239 | |||
240 | /* input was all buffered or compressed (put will fit in int) */ |
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241 | return (int)put; |
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242 | } |
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243 | |||
244 | /* -- see zlib.h -- */ |
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245 | int ZEXPORT gzputc(file, c) |
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246 | gzFile file; |
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247 | int c; |
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248 | { |
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249 | unsigned have; |
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250 | unsigned char buf[1]; |
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251 | gz_statep state; |
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252 | z_streamp strm; |
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253 | |||
254 | /* get internal structure */ |
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255 | if (file == NULL) |
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256 | return -1; |
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257 | state = (gz_statep)file; |
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258 | strm = &(state->strm); |
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259 | |||
260 | /* check that we're writing and that there's no error */ |
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261 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
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262 | return -1; |
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263 | |||
264 | /* check for seek request */ |
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265 | if (state->seek) { |
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266 | state->seek = 0; |
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267 | if (gz_zero(state, state->skip) == -1) |
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268 | return -1; |
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269 | } |
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270 | |||
271 | /* try writing to input buffer for speed (state->size == 0 if buffer not |
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272 | initialized) */ |
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273 | if (state->size) { |
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274 | if (strm->avail_in == 0) |
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275 | strm->next_in = state->in; |
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276 | have = (unsigned)((strm->next_in + strm->avail_in) - state->in); |
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277 | if (have < state->size) { |
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278 | state->in[have] = c; |
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279 | strm->avail_in++; |
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280 | state->x.pos++; |
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281 | return c & 0xff; |
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282 | } |
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283 | } |
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284 | |||
285 | /* no room in buffer or not initialized, use gz_write() */ |
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286 | buf[0] = c; |
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287 | if (gzwrite(file, buf, 1) != 1) |
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288 | return -1; |
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289 | return c & 0xff; |
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290 | } |
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291 | |||
292 | /* -- see zlib.h -- */ |
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293 | int ZEXPORT gzputs(file, str) |
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294 | gzFile file; |
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295 | const char *str; |
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296 | { |
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297 | int ret; |
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298 | unsigned len; |
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299 | |||
300 | /* write string */ |
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301 | len = (unsigned)strlen(str); |
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302 | ret = gzwrite(file, str, len); |
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303 | return ret == 0 && len != 0 ? -1 : ret; |
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304 | } |
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305 | |||
306 | #if defined(STDC) || defined(Z_HAVE_STDARG_H) |
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307 | #include |
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308 | |||
309 | /* -- see zlib.h -- */ |
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310 | int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va) |
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311 | { |
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312 | int size, len; |
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313 | gz_statep state; |
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314 | z_streamp strm; |
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315 | |||
316 | /* get internal structure */ |
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317 | if (file == NULL) |
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318 | return -1; |
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319 | state = (gz_statep)file; |
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320 | strm = &(state->strm); |
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321 | |||
322 | /* check that we're writing and that there's no error */ |
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323 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
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324 | return 0; |
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325 | |||
326 | /* make sure we have some buffer space */ |
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327 | if (state->size == 0 && gz_init(state) == -1) |
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328 | return 0; |
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329 | |||
330 | /* check for seek request */ |
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331 | if (state->seek) { |
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332 | state->seek = 0; |
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333 | if (gz_zero(state, state->skip) == -1) |
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334 | return 0; |
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335 | } |
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336 | |||
337 | /* consume whatever's left in the input buffer */ |
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338 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
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339 | return 0; |
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340 | |||
341 | /* do the printf() into the input buffer, put length in len */ |
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342 | size = (int)(state->size); |
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343 | state->in[size - 1] = 0; |
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344 | #ifdef NO_vsnprintf |
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345 | # ifdef HAS_vsprintf_void |
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346 | (void)vsprintf((char *)(state->in), format, va); |
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347 | for (len = 0; len < size; len++) |
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348 | if (state->in[len] == 0) break; |
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349 | # else |
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350 | len = vsprintf((char *)(state->in), format, va); |
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351 | # endif |
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352 | #else |
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353 | # ifdef HAS_vsnprintf_void |
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354 | (void)vsnprintf((char *)(state->in), size, format, va); |
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355 | len = strlen((char *)(state->in)); |
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356 | # else |
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357 | len = vsnprintf((char *)(state->in), size, format, va); |
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358 | # endif |
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359 | #endif |
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360 | |||
361 | /* check that printf() results fit in buffer */ |
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362 | if (len <= 0 || len >= (int)size || state->in[size - 1] != 0) |
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363 | return 0; |
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364 | |||
365 | /* update buffer and position, defer compression until needed */ |
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366 | strm->avail_in = (unsigned)len; |
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367 | strm->next_in = state->in; |
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368 | state->x.pos += len; |
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369 | return len; |
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370 | } |
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371 | |||
372 | int ZEXPORTVA gzprintf(gzFile file, const char *format, ...) |
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373 | { |
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374 | va_list va; |
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375 | int ret; |
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376 | |||
377 | va_start(va, format); |
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378 | ret = gzvprintf(file, format, va); |
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379 | va_end(va); |
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380 | return ret; |
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381 | } |
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382 | |||
383 | #else /* !STDC && !Z_HAVE_STDARG_H */ |
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384 | |||
385 | /* -- see zlib.h -- */ |
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386 | int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, |
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387 | a11, a12, a13, a14, a15, a16, a17, a18, a19, a20) |
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388 | gzFile file; |
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389 | const char *format; |
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390 | int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, |
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391 | a11, a12, a13, a14, a15, a16, a17, a18, a19, a20; |
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392 | { |
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393 | int size, len; |
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394 | gz_statep state; |
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395 | z_streamp strm; |
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396 | |||
397 | /* get internal structure */ |
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398 | if (file == NULL) |
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399 | return -1; |
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400 | state = (gz_statep)file; |
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401 | strm = &(state->strm); |
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402 | |||
403 | /* check that can really pass pointer in ints */ |
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404 | if (sizeof(int) != sizeof(void *)) |
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405 | return 0; |
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406 | |||
407 | /* check that we're writing and that there's no error */ |
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408 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
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409 | return 0; |
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410 | |||
411 | /* make sure we have some buffer space */ |
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412 | if (state->size == 0 && gz_init(state) == -1) |
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413 | return 0; |
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414 | |||
415 | /* check for seek request */ |
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416 | if (state->seek) { |
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417 | state->seek = 0; |
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418 | if (gz_zero(state, state->skip) == -1) |
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419 | return 0; |
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420 | } |
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421 | |||
422 | /* consume whatever's left in the input buffer */ |
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423 | if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1) |
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424 | return 0; |
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425 | |||
426 | /* do the printf() into the input buffer, put length in len */ |
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427 | size = (int)(state->size); |
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428 | state->in[size - 1] = 0; |
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429 | #ifdef NO_snprintf |
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430 | # ifdef HAS_sprintf_void |
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431 | sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8, |
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432 | a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
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433 | for (len = 0; len < size; len++) |
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434 | if (state->in[len] == 0) break; |
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435 | # else |
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436 | len = sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8, |
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437 | a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
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438 | # endif |
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439 | #else |
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440 | # ifdef HAS_snprintf_void |
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441 | snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8, |
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442 | a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20); |
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443 | len = strlen((char *)(state->in)); |
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444 | # else |
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445 | len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, |
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446 | a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, |
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447 | a19, a20); |
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448 | # endif |
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449 | #endif |
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450 | |||
451 | /* check that printf() results fit in buffer */ |
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452 | if (len <= 0 || len >= (int)size || state->in[size - 1] != 0) |
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453 | return 0; |
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454 | |||
455 | /* update buffer and position, defer compression until needed */ |
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456 | strm->avail_in = (unsigned)len; |
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457 | strm->next_in = state->in; |
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458 | state->x.pos += len; |
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459 | return len; |
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460 | } |
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461 | |||
462 | #endif |
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463 | |||
464 | /* -- see zlib.h -- */ |
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465 | int ZEXPORT gzflush(file, flush) |
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466 | gzFile file; |
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467 | int flush; |
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468 | { |
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469 | gz_statep state; |
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470 | |||
471 | /* get internal structure */ |
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472 | if (file == NULL) |
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473 | return -1; |
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474 | state = (gz_statep)file; |
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475 | |||
476 | /* check that we're writing and that there's no error */ |
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477 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
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478 | return Z_STREAM_ERROR; |
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479 | |||
480 | /* check flush parameter */ |
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481 | if (flush < 0 || flush > Z_FINISH) |
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482 | return Z_STREAM_ERROR; |
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483 | |||
484 | /* check for seek request */ |
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485 | if (state->seek) { |
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486 | state->seek = 0; |
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487 | if (gz_zero(state, state->skip) == -1) |
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488 | return -1; |
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489 | } |
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490 | |||
491 | /* compress remaining data with requested flush */ |
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492 | gz_comp(state, flush); |
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493 | return state->err; |
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494 | } |
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495 | |||
496 | /* -- see zlib.h -- */ |
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497 | int ZEXPORT gzsetparams(file, level, strategy) |
||
498 | gzFile file; |
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499 | int level; |
||
500 | int strategy; |
||
501 | { |
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502 | gz_statep state; |
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503 | z_streamp strm; |
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504 | |||
505 | /* get internal structure */ |
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506 | if (file == NULL) |
||
507 | return Z_STREAM_ERROR; |
||
508 | state = (gz_statep)file; |
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509 | strm = &(state->strm); |
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510 | |||
511 | /* check that we're writing and that there's no error */ |
||
512 | if (state->mode != GZ_WRITE || state->err != Z_OK) |
||
513 | return Z_STREAM_ERROR; |
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514 | |||
515 | /* if no change is requested, then do nothing */ |
||
516 | if (level == state->level && strategy == state->strategy) |
||
517 | return Z_OK; |
||
518 | |||
519 | /* check for seek request */ |
||
520 | if (state->seek) { |
||
521 | state->seek = 0; |
||
522 | if (gz_zero(state, state->skip) == -1) |
||
523 | return -1; |
||
524 | } |
||
525 | |||
526 | /* change compression parameters for subsequent input */ |
||
527 | if (state->size) { |
||
528 | /* flush previous input with previous parameters before changing */ |
||
529 | if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1) |
||
530 | return state->err; |
||
531 | deflateParams(strm, level, strategy); |
||
532 | } |
||
533 | state->level = level; |
||
534 | state->strategy = strategy; |
||
535 | return Z_OK; |
||
536 | } |
||
537 | |||
538 | /* -- see zlib.h -- */ |
||
539 | int ZEXPORT gzclose_w(file) |
||
540 | gzFile file; |
||
541 | { |
||
542 | int ret = Z_OK; |
||
543 | gz_statep state; |
||
544 | |||
545 | /* get internal structure */ |
||
546 | if (file == NULL) |
||
547 | return Z_STREAM_ERROR; |
||
548 | state = (gz_statep)file; |
||
549 | |||
550 | /* check that we're writing */ |
||
551 | if (state->mode != GZ_WRITE) |
||
552 | return Z_STREAM_ERROR; |
||
553 | |||
554 | /* check for seek request */ |
||
555 | if (state->seek) { |
||
556 | state->seek = 0; |
||
557 | if (gz_zero(state, state->skip) == -1) |
||
558 | ret = state->err; |
||
559 | } |
||
560 | |||
561 | /* flush, free memory, and close file */ |
||
562 | if (gz_comp(state, Z_FINISH) == -1) |
||
563 | ret = state->err; |
||
564 | if (state->size) { |
||
565 | if (!state->direct) { |
||
566 | (void)deflateEnd(&(state->strm)); |
||
567 | free(state->out); |
||
568 | } |
||
569 | free(state->in); |
||
570 | } |
||
571 | gz_error(state, Z_OK, NULL); |
||
572 | free(state->path); |
||
573 | if (close(state->fd) == -1) |
||
574 | ret = Z_ERRNO; |
||
575 | free(state); |
||
576 | return ret; |
||
577 | }>=>>=>>>>>>> |