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Rev | Author | Line No. | Line |
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8341 | dunkaist | 1 | |
2 | |||
3 | |||
4 | ; Copyright (c) 1998-2002,2004,2006-2014,2016 Glenn Randers-Pehrson |
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5 | ; (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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6 | ; (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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7 | |||
8 | |||
9 | ; For conditions of distribution and use, see the disclaimer |
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10 | ; and license in png.inc |
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11 | |||
12 | |||
13 | ; need special memory handling are expected to supply replacement |
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14 | ; functions for png_malloc() and png_free(), and to use |
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15 | ; png_create_read_struct_2() and png_create_write_struct_2() to |
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16 | ; identify the replacement functions. |
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17 | |||
18 | |||
19 | ;void (png_structrp png_ptr) |
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20 | align 4 |
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21 | proc png_destroy_png_struct uses eax ecx edi esi, png_ptr:dword |
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22 | locals |
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23 | dummy_struct png_struct |
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24 | endl |
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25 | mov edi,[png_ptr] |
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26 | cmp edi,0 |
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27 | je @f ;if (..!=0) |
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28 | ; png_free might call png_error and may certainly call |
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29 | ; png_get_mem_ptr, so fake a temporary png_struct to support this. |
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30 | |||
31 | |||
32 | mov esi,edi |
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33 | mov edi,ebp |
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34 | sub edi,ecx |
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35 | rep movsb ;dummy_struct = *png_ptr |
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36 | mov edi,[png_ptr] |
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37 | xor eax,eax |
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38 | mov ecx,sizeof.png_struct |
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39 | rep stosb ;memset(png_ptr, 0, (sizeof *png_ptr)) |
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40 | mov esi,ebp |
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41 | sub esi,sizeof.png_struct |
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42 | stdcall png_free, esi, [png_ptr] |
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43 | |||
44 | |||
45 | ; We may have a jmp_buf left to deallocate. |
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46 | stdcall png_free_jmpbuf, esi |
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47 | end if |
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48 | @@: |
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49 | ret |
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50 | endp |
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51 | |||
52 | |||
53 | ; 64K. However, zlib may allocate more than 64K if you don't tell |
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54 | ; it not to. See zconf.h and png.h for more information. zlib does |
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55 | ; need to allocate exactly 64K, so whatever you call here must |
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56 | ; have the ability to do that. |
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57 | |||
58 | |||
59 | align 4 |
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60 | proc png_calloc uses ebx ecx edi, png_ptr:dword, size:dword |
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61 | stdcall png_malloc, [png_ptr], [size] |
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62 | |||
63 | |||
64 | je @f ;if (..!=0) |
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65 | mov ebx,eax |
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66 | mov edi,eax |
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67 | mov ecx,[size] |
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68 | xor eax,eax |
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69 | rep stosb ;memset(ret, 0, size) |
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70 | mov eax,ebx |
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71 | @@: |
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72 | ret |
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73 | endp |
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74 | |||
75 | |||
76 | ; allocating memory, taking into account limits and PNG_USER_MEM_SUPPORTED. |
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77 | ; Checking and error handling must happen outside this routine; it returns NULL |
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78 | ; if the allocation cannot be done (for any reason.) |
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79 | |||
80 | |||
81 | align 4 |
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82 | proc png_malloc_base uses ebx ecx, png_ptr:dword, size:dword |
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83 | ; Moved to png_malloc_base from png_malloc_default in 1.6.0; the DOS |
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84 | ; allocators have also been removed in 1.6.0, so any 16-bit system now has |
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85 | ; to implement a user memory handler. This checks to be sure it isn't |
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86 | ; called with big numbers. |
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87 | |||
88 | |||
89 | ; can be false when integer overflow happens. |
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90 | |||
91 | |||
92 | jle .end0 |
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93 | cmp dword[size],PNG_SIZE_MAX |
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94 | jg .end0 ; if (..>.. && ..<=..) |
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95 | if PNG_MAX_MALLOC_64K eq 1 |
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96 | cmp dword[size],65536 |
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97 | jg .end0 |
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98 | end if |
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99 | if PNG_USER_MEM_SUPPORTED eq 1 |
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100 | mov ebx,[png_ptr] |
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101 | cmp ebx,0 |
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102 | je @f |
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103 | cmp dword[ebx+png_struct.malloc_fn],0 |
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104 | je @f ;if (..!=0 && ..!=0) |
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105 | stdcall [ebx+png_struct.malloc_fn], ebx, [size] |
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106 | jmp .end_f |
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107 | @@: ;else |
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108 | end if |
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109 | ;stdcall [mem.alloc], [size] |
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110 | mcall SF_SYS_MISC, SSF_MEM_ALLOC, [size] |
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111 | jmp .end_f ;checked for truncation above |
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112 | .end0: ;else |
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113 | xor eax,eax |
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114 | .end_f: |
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115 | ret |
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116 | endp |
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117 | |||
118 | |||
119 | ; that arises because of the checks in png_realloc_array that are repeated in |
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120 | ; png_malloc_array. |
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121 | |||
122 | |||
123 | align 4 |
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124 | proc png_malloc_array_checked, png_ptr:dword, nelements:dword, element_size:dword |
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125 | ; png_alloc_size_t req = nelements; /* known to be > 0 */ |
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126 | |||
127 | |||
128 | ; return png_malloc_base(png_ptr, req * element_size); |
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129 | |||
130 | |||
131 | xor eax,eax |
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132 | .end_f: |
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133 | ret |
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134 | endp |
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135 | |||
136 | |||
137 | align 4 |
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138 | proc png_malloc_array, png_ptr:dword, nelements:dword, element_size:dword |
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139 | ; if (nelements <= 0 || element_size == 0) |
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140 | ; png_error(png_ptr, "internal error: array alloc"); |
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141 | |||
142 | |||
143 | ret |
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144 | endp |
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145 | |||
146 | |||
147 | ; int old_elements, int add_elements, size_t element_size) |
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148 | align 4 |
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149 | proc png_realloc_array, png_ptr:dword, old_array:dword, old_elements:dword, add_elements:dword, element_size:dword |
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150 | ; These are internal errors: |
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151 | ; if (add_elements <= 0 || element_size == 0 || old_elements < 0 || |
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152 | ; (old_array == NULL && old_elements > 0)) |
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153 | ; png_error(png_ptr, "internal error: array realloc"); |
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154 | |||
155 | |||
156 | ; check.) |
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157 | |||
158 | |||
159 | ; { |
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160 | ; voidp new_array = png_malloc_array_checked(png_ptr, |
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161 | ; old_elements+add_elements, element_size); |
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162 | ; |
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163 | ; if (new_array != NULL) |
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164 | ; { |
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165 | ; Because png_malloc_array worked the size calculations below cannot |
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166 | ; overflow. |
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167 | |||
168 | |||
169 | ; memcpy(new_array, old_array, element_size*(unsigned)old_elements); |
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170 | ; |
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171 | ; memset((char*)new_array + element_size*(unsigned)old_elements, 0, |
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172 | ; element_size*(unsigned)add_elements); |
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173 | ; |
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174 | ; return new_array; |
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175 | ; } |
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176 | ; } |
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177 | |||
178 | |||
179 | .end_f: |
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180 | ret |
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181 | endp |
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182 | |||
183 | |||
184 | ; png_malloc always exists, but if PNG_USER_MEM_SUPPORTED is defined a separate |
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185 | ; function png_malloc_default is also provided. |
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186 | |||
187 | |||
188 | align 4 |
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189 | proc png_malloc uses edi, png_ptr:dword, size:dword |
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190 | xor eax,eax |
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191 | mov edi,[png_ptr] |
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192 | cmp edi,0 |
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193 | je @f ;if (..==0) return 0 |
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194 | |||
195 | |||
196 | |||
197 | |||
198 | jne @f ;if (..==0) |
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199 | png_error edi, 'Out of memory' ;'m' means png_malloc |
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200 | @@: |
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201 | ret |
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202 | endp |
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203 | |||
204 | |||
205 | align 4 |
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206 | proc png_malloc_default uses edi, png_ptr:dword, size:dword |
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207 | xor eax,eax |
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208 | mov edi,[png_ptr] |
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209 | cmp edi,0 |
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210 | je @f ;if (..==0) return 0 |
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211 | |||
212 | |||
213 | stdcall png_malloc_base, 0, [size] ;0 - use malloc |
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214 | |||
215 | |||
216 | jne @f ;if (..==0) |
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217 | png_error edi, 'Out of Memory' ;'M' means png_malloc_default |
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218 | @@: |
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219 | ret |
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220 | endp |
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221 | |||
222 | |||
223 | ; function will issue a png_warning and return NULL instead of issuing a |
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224 | ; png_error, if it fails to allocate the requested memory. |
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225 | |||
226 | |||
227 | align 4 |
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228 | proc png_malloc_warn uses edi, png_ptr:dword, size:dword |
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229 | mov edi,[png_ptr] |
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230 | cmp edi,0 |
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231 | je .end0 ;if (..!=0) |
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232 | stdcall png_malloc_base, edi, [size] |
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233 | cmp eax,0 |
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234 | jne .end_f ;if (..!=0) return ret |
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235 | |||
236 | |||
237 | .end0: |
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238 | xor eax,eax |
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239 | .end_f: |
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240 | ret |
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241 | endp |
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242 | |||
243 | |||
244 | ; without taking any action. |
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245 | |||
246 | |||
247 | align 4 |
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248 | proc png_free uses eax ebx ecx, png_ptr:dword, p2ptr:dword |
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249 | mov ebx,[png_ptr] |
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250 | cmp ebx,0 |
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251 | je .end_f |
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252 | mov ecx,[p2ptr] |
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253 | cmp ecx,0 |
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254 | je .end_f ;if (..==0 || ..==0) return |
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255 | |||
256 | |||
257 | cmp dword[ebx+png_struct.free_fn],0 |
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258 | je @f ;if (..!=0) |
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259 | stdcall dword[ebx+png_struct.free_fn], ebx, [p2ptr] |
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260 | jmp .end_f |
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261 | @@: ;else |
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262 | end if |
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263 | mcall SF_SYS_MISC, SSF_MEM_FREE, [p2ptr] |
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264 | .end_f: |
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265 | ret |
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266 | endp |
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267 | |||
268 | |||
269 | ; of allocating and freeing memory. |
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270 | |||
271 | |||
272 | align 4 |
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273 | proc png_set_mem_fn uses eax edi, png_ptr:dword, mem_ptr:dword, malloc_fn:dword, free_fn:dword |
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274 | mov edi,[png_ptr] |
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275 | cmp edi,0 |
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276 | je @f ;if (..!=0) |
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277 | mov eax,[mem_ptr] |
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278 | mov [edi+png_struct.mem_ptr],eax |
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279 | mov eax,[malloc_fn] |
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280 | mov [edi+png_struct.malloc_fn],eax |
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281 | mov eax,[free_fn] |
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282 | mov [edi+png_struct.free_fn],eax |
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283 | @@: |
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284 | ret |
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285 | endp |
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286 | |||
287 | |||
288 | ; functions. The application should free any memory associated with this |
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289 | ; pointer before png_write_destroy and png_read_destroy are called. |
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290 | |||
291 | |||
292 | align 4 |
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293 | proc png_get_mem_ptr uses edi, png_ptr:dword |
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294 | xor eax,eax |
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295 | mov edi,[png_ptr] |
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296 | cmp edi,0 |
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297 | je @f ;if (..==0) return 0 |
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298 | mov eax,[edi+png_struct.mem_ptr] |
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299 | @@: |
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300 | ret |
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301 | endp=>>=>=>=>=..) |
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302 | if> |
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303 |