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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | |
2 | * |
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3 | * Last changed in libpng 1.6.1 [March 28, 2013] |
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4 | * Copyright (c) 1998-2013 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 | * |
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8 | * This code is released under the libpng license. |
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9 | * For conditions of distribution and use, see the disclaimer |
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10 | * and license in png.h |
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11 | * |
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12 | * This file provides a location for all error handling. Users who |
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13 | * need special error handling are expected to write replacement functions |
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14 | * and use png_set_error_fn() to use those functions. See the instructions |
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15 | * at each function. |
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16 | */ |
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17 | |||
18 | |||
19 | |||
20 | |||
21 | |||
22 | |||
23 | png_const_charp error_message)),PNG_NORETURN); |
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24 | |||
25 | |||
26 | static void /* PRIVATE */ |
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27 | png_default_warning PNGARG((png_const_structrp png_ptr, |
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28 | png_const_charp warning_message)); |
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29 | #endif /* PNG_WARNINGS_SUPPORTED */ |
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30 | |||
31 | |||
32 | * should not be changed. If there is a need to handle errors differently, |
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33 | * you should supply a replacement error function and use png_set_error_fn() |
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34 | * to replace the error function at run-time. |
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35 | */ |
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36 | #ifdef PNG_ERROR_TEXT_SUPPORTED |
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37 | PNG_FUNCTION(void,PNGAPI |
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38 | png_error,(png_const_structrp png_ptr, png_const_charp error_message), |
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39 | PNG_NORETURN) |
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40 | { |
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41 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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42 | char msg[16]; |
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43 | if (png_ptr != NULL) |
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44 | { |
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45 | if (png_ptr->flags& |
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46 | (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) |
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47 | { |
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48 | if (*error_message == PNG_LITERAL_SHARP) |
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49 | { |
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50 | /* Strip "#nnnn " from beginning of error message. */ |
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51 | int offset; |
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52 | for (offset = 1; offset<15; offset++) |
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53 | if (error_message[offset] == ' ') |
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54 | break; |
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55 | |||
56 | |||
57 | { |
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58 | int i; |
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59 | for (i = 0; i < offset - 1; i++) |
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60 | msg[i] = error_message[i + 1]; |
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61 | msg[i - 1] = '\0'; |
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62 | error_message = msg; |
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63 | } |
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64 | |||
65 | |||
66 | error_message += offset; |
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67 | } |
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68 | |||
69 | |||
70 | { |
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71 | if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) |
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72 | { |
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73 | msg[0] = '0'; |
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74 | msg[1] = '\0'; |
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75 | error_message = msg; |
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76 | } |
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77 | } |
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78 | } |
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79 | } |
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80 | #endif |
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81 | if (png_ptr != NULL && png_ptr->error_fn != NULL) |
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82 | (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), |
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83 | error_message); |
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84 | |||
85 | |||
86 | use the default handler, which will not return. */ |
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87 | png_default_error(png_ptr, error_message); |
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88 | } |
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89 | #else |
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90 | PNG_FUNCTION(void,PNGAPI |
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91 | png_err,(png_const_structrp png_ptr),PNG_NORETURN) |
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92 | { |
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93 | /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed |
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94 | * erroneously as '\0', instead of the empty string "". This was |
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95 | * apparently an error, introduced in libpng-1.2.20, and png_default_error |
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96 | * will crash in this case. |
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97 | */ |
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98 | if (png_ptr != NULL && png_ptr->error_fn != NULL) |
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99 | (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), ""); |
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100 | |||
101 | |||
102 | use the default handler, which will not return. */ |
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103 | png_default_error(png_ptr, ""); |
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104 | } |
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105 | #endif /* PNG_ERROR_TEXT_SUPPORTED */ |
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106 | |||
107 | |||
108 | * error checking is not required in the caller. |
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109 | */ |
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110 | size_t |
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111 | png_safecat(png_charp buffer, size_t bufsize, size_t pos, |
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112 | png_const_charp string) |
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113 | { |
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114 | if (buffer != NULL && pos < bufsize) |
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115 | { |
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116 | if (string != NULL) |
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117 | while (*string != '\0' && pos < bufsize-1) |
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118 | buffer[pos++] = *string++; |
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119 | |||
120 | |||
121 | } |
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122 | |||
123 | |||
124 | } |
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125 | |||
126 | |||
127 | /* Utility to dump an unsigned value into a buffer, given a start pointer and |
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128 | * and end pointer (which should point just *beyond* the end of the buffer!) |
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129 | * Returns the pointer to the start of the formatted string. |
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130 | */ |
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131 | png_charp |
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132 | png_format_number(png_const_charp start, png_charp end, int format, |
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133 | png_alloc_size_t number) |
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134 | { |
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135 | int count = 0; /* number of digits output */ |
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136 | int mincount = 1; /* minimum number required */ |
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137 | int output = 0; /* digit output (for the fixed point format) */ |
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138 | |||
139 | |||
140 | |||
141 | |||
142 | * number zero. |
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143 | */ |
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144 | while (end > start && (number != 0 || count < mincount)) |
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145 | { |
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146 | |||
147 | |||
148 | |||
149 | |||
150 | { |
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151 | case PNG_NUMBER_FORMAT_fixed: |
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152 | /* Needs five digits (the fraction) */ |
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153 | mincount = 5; |
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154 | if (output || number % 10 != 0) |
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155 | { |
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156 | *--end = digits[number % 10]; |
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157 | output = 1; |
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158 | } |
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159 | number /= 10; |
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160 | break; |
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161 | |||
162 | |||
163 | /* Expects at least 2 digits. */ |
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164 | mincount = 2; |
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165 | /* FALL THROUGH */ |
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166 | |||
167 | |||
168 | *--end = digits[number % 10]; |
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169 | number /= 10; |
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170 | break; |
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171 | |||
172 | |||
173 | /* This format expects at least two digits */ |
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174 | mincount = 2; |
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175 | /* FALL THROUGH */ |
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176 | |||
177 | |||
178 | *--end = digits[number & 0xf]; |
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179 | number >>= 4; |
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180 | break; |
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181 | |||
182 | |||
183 | number = 0; |
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184 | break; |
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185 | } |
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186 | |||
187 | |||
188 | ++count; |
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189 | |||
190 | |||
191 | if (format == PNG_NUMBER_FORMAT_fixed) if (count == 5) if (end > start) |
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192 | { |
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193 | /* End of the fraction, but maybe nothing was output? In that case |
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194 | * drop the decimal point. If the number is a true zero handle that |
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195 | * here. |
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196 | */ |
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197 | if (output) |
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198 | *--end = '.'; |
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199 | else if (number == 0) /* and !output */ |
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200 | *--end = '0'; |
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201 | } |
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202 | } |
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203 | |||
204 | |||
205 | } |
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206 | #endif |
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207 | |||
208 | |||
209 | /* This function is called whenever there is a non-fatal error. This function |
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210 | * should not be changed. If there is a need to handle warnings differently, |
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211 | * you should supply a replacement warning function and use |
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212 | * png_set_error_fn() to replace the warning function at run-time. |
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213 | */ |
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214 | void PNGAPI |
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215 | png_warning(png_const_structrp png_ptr, png_const_charp warning_message) |
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216 | { |
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217 | int offset = 0; |
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218 | if (png_ptr != NULL) |
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219 | { |
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220 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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221 | if (png_ptr->flags& |
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222 | (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) |
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223 | #endif |
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224 | { |
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225 | if (*warning_message == PNG_LITERAL_SHARP) |
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226 | { |
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227 | for (offset = 1; offset < 15; offset++) |
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228 | if (warning_message[offset] == ' ') |
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229 | break; |
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230 | } |
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231 | } |
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232 | } |
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233 | if (png_ptr != NULL && png_ptr->warning_fn != NULL) |
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234 | (*(png_ptr->warning_fn))(png_constcast(png_structrp,png_ptr), |
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235 | warning_message + offset); |
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236 | else |
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237 | png_default_warning(png_ptr, warning_message + offset); |
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238 | } |
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239 | |||
240 | |||
241 | * PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter |
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242 | * is introduced by @ |
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243 | * standard established by X/Open for internationalizable error messages. |
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244 | */ |
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245 | void |
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246 | png_warning_parameter(png_warning_parameters p, int number, |
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247 | png_const_charp string) |
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248 | { |
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249 | if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT) |
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250 | (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string); |
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251 | } |
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252 | |||
253 | |||
254 | png_warning_parameter_unsigned(png_warning_parameters p, int number, int format, |
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255 | png_alloc_size_t value) |
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256 | { |
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257 | char buffer[PNG_NUMBER_BUFFER_SIZE]; |
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258 | png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value)); |
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259 | } |
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260 | |||
261 | |||
262 | png_warning_parameter_signed(png_warning_parameters p, int number, int format, |
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263 | png_int_32 value) |
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264 | { |
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265 | png_alloc_size_t u; |
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266 | png_charp str; |
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267 | char buffer[PNG_NUMBER_BUFFER_SIZE]; |
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268 | |||
269 | |||
270 | u = (png_alloc_size_t)value; |
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271 | if (value < 0) |
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272 | u = ~u + 1; |
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273 | |||
274 | |||
275 | |||
276 | |||
277 | *--str = '-'; |
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278 | |||
279 | |||
280 | } |
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281 | |||
282 | |||
283 | png_formatted_warning(png_const_structrp png_ptr, png_warning_parameters p, |
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284 | png_const_charp message) |
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285 | { |
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286 | /* The internal buffer is just 192 bytes - enough for all our messages, |
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287 | * overflow doesn't happen because this code checks! If someone figures |
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288 | * out how to send us a message longer than 192 bytes, all that will |
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289 | * happen is that the message will be truncated appropriately. |
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290 | */ |
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291 | size_t i = 0; /* Index in the msg[] buffer: */ |
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292 | char msg[192]; |
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293 | |||
294 | |||
295 | * to msg[i++] then returns here to validate that there is still space for |
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296 | * the trailing '\0'. It may (in the case of a parameter) read more than |
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297 | * one character from message[]; it must check for '\0' and continue to the |
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298 | * test if it finds the end of string. |
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299 | */ |
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300 | while (i<(sizeof msg)-1 && *message != '\0') |
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301 | { |
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302 | /* '@' at end of string is now just printed (previously it was skipped); |
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303 | * it is an error in the calling code to terminate the string with @. |
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304 | */ |
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305 | if (p != NULL && *message == '@' && message[1] != '\0') |
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306 | { |
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307 | int parameter_char = *++message; /* Consume the '@' */ |
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308 | static const char valid_parameters[] = "123456789"; |
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309 | int parameter = 0; |
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310 | |||
311 | |||
312 | * parameter to use. |
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313 | */ |
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314 | while (valid_parameters[parameter] != parameter_char && |
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315 | valid_parameters[parameter] != '\0') |
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316 | ++parameter; |
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317 | |||
318 | |||
319 | if (parameter < PNG_WARNING_PARAMETER_COUNT) |
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320 | { |
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321 | /* Append this parameter */ |
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322 | png_const_charp parm = p[parameter]; |
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323 | png_const_charp pend = p[parameter] + (sizeof p[parameter]); |
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324 | |||
325 | |||
326 | * that parm[] has been initialized, so there is no guarantee of a |
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327 | * trailing '\0': |
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328 | */ |
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329 | while (i<(sizeof msg)-1 && *parm != '\0' && parm < pend) |
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330 | msg[i++] = *parm++; |
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331 | |||
332 | |||
333 | ++message; |
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334 | continue; |
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335 | } |
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336 | |||
337 | |||
338 | * copy that. This is known not to be '\0' because of the test above. |
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339 | */ |
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340 | } |
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341 | |||
342 | |||
343 | * above where there is a lone '@' at the end of the message string. |
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344 | */ |
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345 | msg[i++] = *message++; |
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346 | } |
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347 | |||
348 | |||
349 | msg[i] = '\0'; |
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350 | |||
351 | |||
352 | * PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these |
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353 | * are not (currently) formatted. |
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354 | */ |
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355 | png_warning(png_ptr, msg); |
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356 | } |
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357 | #endif /* PNG_WARNINGS_SUPPORTED */ |
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358 | |||
359 | |||
360 | void PNGAPI |
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361 | png_benign_error(png_const_structrp png_ptr, png_const_charp error_message) |
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362 | { |
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363 | if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) |
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364 | { |
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365 | # ifdef PNG_READ_SUPPORTED |
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366 | if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && |
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367 | png_ptr->chunk_name != 0) |
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368 | png_chunk_warning(png_ptr, error_message); |
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369 | else |
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370 | # endif |
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371 | png_warning(png_ptr, error_message); |
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372 | } |
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373 | |||
374 | |||
375 | { |
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376 | # ifdef PNG_READ_SUPPORTED |
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377 | if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && |
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378 | png_ptr->chunk_name != 0) |
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379 | png_chunk_error(png_ptr, error_message); |
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380 | else |
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381 | # endif |
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382 | png_error(png_ptr, error_message); |
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383 | } |
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384 | } |
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385 | |||
386 | |||
387 | png_app_warning(png_const_structrp png_ptr, png_const_charp error_message) |
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388 | { |
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389 | if (png_ptr->flags & PNG_FLAG_APP_WARNINGS_WARN) |
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390 | png_warning(png_ptr, error_message); |
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391 | else |
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392 | png_error(png_ptr, error_message); |
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393 | } |
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394 | |||
395 | |||
396 | png_app_error(png_const_structrp png_ptr, png_const_charp error_message) |
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397 | { |
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398 | if (png_ptr->flags & PNG_FLAG_APP_ERRORS_WARN) |
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399 | png_warning(png_ptr, error_message); |
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400 | else |
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401 | png_error(png_ptr, error_message); |
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402 | } |
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403 | #endif /* BENIGN_ERRORS */ |
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404 | |||
405 | |||
406 | * to the current chunk. The chunk name comes from png_ptr->chunk_name, |
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407 | * this is used to prefix the message. The message is limited in length |
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408 | * to 63 bytes, the name characters are output as hex digits wrapped in [] |
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409 | * if the character is invalid. |
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410 | */ |
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411 | #define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) |
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412 | static PNG_CONST char png_digit[16] = { |
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413 | '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', |
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414 | 'A', 'B', 'C', 'D', 'E', 'F' |
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415 | }; |
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416 | |||
417 | |||
418 | #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED) |
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419 | static void /* PRIVATE */ |
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420 | png_format_buffer(png_const_structrp png_ptr, png_charp buffer, png_const_charp |
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421 | error_message) |
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422 | { |
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423 | png_uint_32 chunk_name = png_ptr->chunk_name; |
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424 | int iout = 0, ishift = 24; |
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425 | |||
426 | |||
427 | { |
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428 | int c = (int)(chunk_name >> ishift) & 0xff; |
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429 | |||
430 | |||
431 | if (isnonalpha(c)) |
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432 | { |
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433 | buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET; |
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434 | buffer[iout++] = png_digit[(c & 0xf0) >> 4]; |
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435 | buffer[iout++] = png_digit[c & 0x0f]; |
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436 | buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET; |
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437 | } |
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438 | |||
439 | |||
440 | { |
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441 | buffer[iout++] = (char)c; |
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442 | } |
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443 | } |
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444 | |||
445 | |||
446 | buffer[iout] = '\0'; |
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447 | |||
448 | |||
449 | { |
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450 | int iin = 0; |
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451 | |||
452 | |||
453 | buffer[iout++] = ' '; |
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454 | |||
455 | |||
456 | buffer[iout++] = error_message[iin++]; |
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457 | |||
458 | |||
459 | buffer[iout] = '\0'; |
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460 | } |
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461 | } |
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462 | #endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */ |
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463 | |||
464 | |||
465 | PNG_FUNCTION(void,PNGAPI |
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466 | png_chunk_error,(png_const_structrp png_ptr, png_const_charp error_message), |
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467 | PNG_NORETURN) |
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468 | { |
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469 | char msg[18+PNG_MAX_ERROR_TEXT]; |
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470 | if (png_ptr == NULL) |
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471 | png_error(png_ptr, error_message); |
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472 | |||
473 | |||
474 | { |
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475 | png_format_buffer(png_ptr, msg, error_message); |
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476 | png_error(png_ptr, msg); |
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477 | } |
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478 | } |
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479 | #endif /* PNG_READ_SUPPORTED && PNG_ERROR_TEXT_SUPPORTED */ |
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480 | |||
481 | |||
482 | void PNGAPI |
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483 | png_chunk_warning(png_const_structrp png_ptr, png_const_charp warning_message) |
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484 | { |
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485 | char msg[18+PNG_MAX_ERROR_TEXT]; |
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486 | if (png_ptr == NULL) |
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487 | png_warning(png_ptr, warning_message); |
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488 | |||
489 | |||
490 | { |
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491 | png_format_buffer(png_ptr, msg, warning_message); |
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492 | png_warning(png_ptr, msg); |
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493 | } |
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494 | } |
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495 | #endif /* PNG_WARNINGS_SUPPORTED */ |
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496 | |||
497 | |||
498 | #ifdef PNG_BENIGN_ERRORS_SUPPORTED |
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499 | void PNGAPI |
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500 | png_chunk_benign_error(png_const_structrp png_ptr, png_const_charp |
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501 | error_message) |
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502 | { |
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503 | if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) |
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504 | png_chunk_warning(png_ptr, error_message); |
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505 | |||
506 | |||
507 | png_chunk_error(png_ptr, error_message); |
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508 | } |
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509 | #endif |
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510 | #endif /* PNG_READ_SUPPORTED */ |
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511 | |||
512 | |||
513 | png_chunk_report(png_const_structrp png_ptr, png_const_charp message, int error) |
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514 | { |
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515 | /* This is always supported, but for just read or just write it |
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516 | * unconditionally does the right thing. |
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517 | */ |
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518 | # if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED) |
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519 | if (png_ptr->mode & PNG_IS_READ_STRUCT) |
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520 | # endif |
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521 | |||
522 | |||
523 | { |
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524 | if (error < PNG_CHUNK_ERROR) |
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525 | png_chunk_warning(png_ptr, message); |
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526 | |||
527 | |||
528 | png_chunk_benign_error(png_ptr, message); |
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529 | } |
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530 | # endif |
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531 | |||
532 | |||
533 | else if (!(png_ptr->mode & PNG_IS_READ_STRUCT)) |
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534 | # endif |
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535 | |||
536 | |||
537 | { |
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538 | if (error < PNG_CHUNK_WRITE_ERROR) |
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539 | png_app_warning(png_ptr, message); |
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540 | |||
541 | |||
542 | png_app_error(png_ptr, message); |
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543 | } |
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544 | # endif |
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545 | } |
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546 | |||
547 | |||
548 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
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549 | PNG_FUNCTION(void, |
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550 | png_fixed_error,(png_const_structrp png_ptr, png_const_charp name),PNG_NORETURN) |
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551 | { |
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552 | # define fixed_message "fixed point overflow in " |
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553 | # define fixed_message_ln ((sizeof fixed_message)-1) |
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554 | int iin; |
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555 | char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT]; |
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556 | memcpy(msg, fixed_message, fixed_message_ln); |
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557 | iin = 0; |
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558 | if (name != NULL) while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0) |
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559 | { |
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560 | msg[fixed_message_ln + iin] = name[iin]; |
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561 | ++iin; |
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562 | } |
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563 | msg[fixed_message_ln + iin] = 0; |
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564 | png_error(png_ptr, msg); |
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565 | } |
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566 | #endif |
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567 | #endif |
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568 | |||
569 | |||
570 | /* This API only exists if ANSI-C style error handling is used, |
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571 | * otherwise it is necessary for png_default_error to be overridden. |
||
572 | */ |
||
573 | jmp_buf* PNGAPI |
||
574 | png_set_longjmp_fn(png_structrp png_ptr, png_longjmp_ptr longjmp_fn, |
||
575 | size_t jmp_buf_size) |
||
576 | { |
||
577 | /* From libpng 1.6.0 the app gets one chance to set a 'jmpbuf_size' value |
||
578 | * and it must not change after that. Libpng doesn't care how big the |
||
579 | * buffer is, just that it doesn't change. |
||
580 | * |
||
581 | * If the buffer size is no *larger* than the size of jmp_buf when libpng is |
||
582 | * compiled a built in jmp_buf is returned; this preserves the pre-1.6.0 |
||
583 | * semantics that this call will not fail. If the size is larger, however, |
||
584 | * the buffer is allocated and this may fail, causing the function to return |
||
585 | * NULL. |
||
586 | */ |
||
587 | if (png_ptr == NULL) |
||
588 | return NULL; |
||
589 | |||
590 | |||
591 | { |
||
592 | png_ptr->jmp_buf_size = 0; /* not allocated */ |
||
593 | |||
594 | |||
595 | png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; |
||
596 | |||
597 | |||
598 | { |
||
599 | png_ptr->jmp_buf_ptr = png_voidcast(jmp_buf *, |
||
600 | png_malloc_warn(png_ptr, jmp_buf_size)); |
||
601 | |||
602 | |||
603 | return NULL; /* new NULL return on OOM */ |
||
604 | |||
605 | |||
606 | } |
||
607 | } |
||
608 | |||
609 | |||
610 | { |
||
611 | size_t size = png_ptr->jmp_buf_size; |
||
612 | |||
613 | |||
614 | { |
||
615 | size = (sizeof png_ptr->jmp_buf_local); |
||
616 | if (png_ptr->jmp_buf_ptr != &png_ptr->jmp_buf_local) |
||
617 | { |
||
618 | /* This is an internal error in libpng: somehow we have been left |
||
619 | * with a stack allocated jmp_buf when the application regained |
||
620 | * control. It's always possible to fix this up, but for the moment |
||
621 | * this is a png_error because that makes it easy to detect. |
||
622 | */ |
||
623 | png_error(png_ptr, "Libpng jmp_buf still allocated"); |
||
624 | /* png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; */ |
||
625 | } |
||
626 | } |
||
627 | |||
628 | |||
629 | { |
||
630 | png_warning(png_ptr, "Application jmp_buf size changed"); |
||
631 | return NULL; /* caller will probably crash: no choice here */ |
||
632 | } |
||
633 | } |
||
634 | |||
635 | |||
636 | * valid to change the function on every call. |
||
637 | */ |
||
638 | png_ptr->longjmp_fn = longjmp_fn; |
||
639 | return png_ptr->jmp_buf_ptr; |
||
640 | } |
||
641 | |||
642 | |||
643 | png_free_jmpbuf(png_structrp png_ptr) |
||
644 | { |
||
645 | if (png_ptr != NULL) |
||
646 | { |
||
647 | jmp_buf *jb = png_ptr->jmp_buf_ptr; |
||
648 | |||
649 | |||
650 | * pointer; used here and in png.c |
||
651 | */ |
||
652 | if (jb != NULL && png_ptr->jmp_buf_size > 0) |
||
653 | { |
||
654 | |||
655 | |||
656 | * does not leave libpng in a state with no valid error handling: the |
||
657 | * free always succeeds, if there is an error it gets ignored. |
||
658 | */ |
||
659 | if (jb != &png_ptr->jmp_buf_local) |
||
660 | { |
||
661 | /* Make an internal, libpng, jmp_buf to return here */ |
||
662 | jmp_buf free_jmp_buf; |
||
663 | |||
664 | |||
665 | { |
||
666 | png_ptr->jmp_buf_ptr = &free_jmp_buf; /* come back here */ |
||
667 | png_ptr->jmp_buf_size = 0; /* stack allocation */ |
||
668 | png_ptr->longjmp_fn = longjmp; |
||
669 | png_free(png_ptr, jb); /* Return to setjmp on error */ |
||
670 | } |
||
671 | } |
||
672 | } |
||
673 | |||
674 | |||
675 | png_ptr->jmp_buf_size = 0; |
||
676 | png_ptr->jmp_buf_ptr = NULL; |
||
677 | png_ptr->longjmp_fn = 0; |
||
678 | } |
||
679 | } |
||
680 | #endif |
||
681 | |||
682 | |||
683 | * this function MUST NOT RETURN, or the program will likely crash. This |
||
684 | * function is used by default, or if the program supplies NULL for the |
||
685 | * error function pointer in png_set_error_fn(). |
||
686 | */ |
||
687 | static PNG_FUNCTION(void /* PRIVATE */, |
||
688 | png_default_error,(png_const_structrp png_ptr, png_const_charp error_message), |
||
689 | PNG_NORETURN) |
||
690 | { |
||
691 | #ifdef PNG_CONSOLE_IO_SUPPORTED |
||
692 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
||
693 | /* Check on NULL only added in 1.5.4 */ |
||
694 | if (error_message != NULL && *error_message == PNG_LITERAL_SHARP) |
||
695 | { |
||
696 | /* Strip "#nnnn " from beginning of error message. */ |
||
697 | int offset; |
||
698 | char error_number[16]; |
||
699 | for (offset = 0; offset<15; offset++) |
||
700 | { |
||
701 | error_number[offset] = error_message[offset + 1]; |
||
702 | if (error_message[offset] == ' ') |
||
703 | break; |
||
704 | } |
||
705 | |||
706 | |||
707 | { |
||
708 | error_number[offset - 1] = '\0'; |
||
709 | fprintf(stderr, "libpng error no. %s: %s", |
||
710 | error_number, error_message + offset + 1); |
||
711 | fprintf(stderr, PNG_STRING_NEWLINE); |
||
712 | } |
||
713 | |||
714 | |||
715 | { |
||
716 | fprintf(stderr, "libpng error: %s, offset=%d", |
||
717 | error_message, offset); |
||
718 | fprintf(stderr, PNG_STRING_NEWLINE); |
||
719 | } |
||
720 | } |
||
721 | else |
||
722 | #endif |
||
723 | { |
||
724 | fprintf(stderr, "libpng error: %s", error_message ? error_message : |
||
725 | "undefined"); |
||
726 | fprintf(stderr, PNG_STRING_NEWLINE); |
||
727 | } |
||
728 | #else |
||
729 | PNG_UNUSED(error_message) /* Make compiler happy */ |
||
730 | #endif |
||
731 | png_longjmp(png_ptr, 1); |
||
732 | } |
||
733 | |||
734 | |||
735 | png_longjmp,(png_const_structrp png_ptr, int val),PNG_NORETURN) |
||
736 | { |
||
737 | #ifdef PNG_SETJMP_SUPPORTED |
||
738 | if (png_ptr && png_ptr->longjmp_fn && png_ptr->jmp_buf_ptr) |
||
739 | png_ptr->longjmp_fn(*png_ptr->jmp_buf_ptr, val); |
||
740 | #endif |
||
741 | |||
742 | |||
743 | PNG_ABORT(); |
||
744 | } |
||
745 | |||
746 | |||
747 | /* This function is called when there is a warning, but the library thinks |
||
748 | * it can continue anyway. Replacement functions don't have to do anything |
||
749 | * here if you don't want them to. In the default configuration, png_ptr is |
||
750 | * not used, but it is passed in case it may be useful. |
||
751 | */ |
||
752 | static void /* PRIVATE */ |
||
753 | png_default_warning(png_const_structrp png_ptr, png_const_charp warning_message) |
||
754 | { |
||
755 | #ifdef PNG_CONSOLE_IO_SUPPORTED |
||
756 | # ifdef PNG_ERROR_NUMBERS_SUPPORTED |
||
757 | if (*warning_message == PNG_LITERAL_SHARP) |
||
758 | { |
||
759 | int offset; |
||
760 | char warning_number[16]; |
||
761 | for (offset = 0; offset < 15; offset++) |
||
762 | { |
||
763 | warning_number[offset] = warning_message[offset + 1]; |
||
764 | if (warning_message[offset] == ' ') |
||
765 | break; |
||
766 | } |
||
767 | |||
768 | |||
769 | { |
||
770 | warning_number[offset + 1] = '\0'; |
||
771 | fprintf(stderr, "libpng warning no. %s: %s", |
||
772 | warning_number, warning_message + offset); |
||
773 | fprintf(stderr, PNG_STRING_NEWLINE); |
||
774 | } |
||
775 | |||
776 | |||
777 | { |
||
778 | fprintf(stderr, "libpng warning: %s", |
||
779 | warning_message); |
||
780 | fprintf(stderr, PNG_STRING_NEWLINE); |
||
781 | } |
||
782 | } |
||
783 | else |
||
784 | # endif |
||
785 | |||
786 | |||
787 | fprintf(stderr, "libpng warning: %s", warning_message); |
||
788 | fprintf(stderr, PNG_STRING_NEWLINE); |
||
789 | } |
||
790 | #else |
||
791 | PNG_UNUSED(warning_message) /* Make compiler happy */ |
||
792 | #endif |
||
793 | PNG_UNUSED(png_ptr) /* Make compiler happy */ |
||
794 | } |
||
795 | #endif /* PNG_WARNINGS_SUPPORTED */ |
||
796 | |||
797 | |||
798 | * of handling errors and warnings. Note that the error function MUST NOT |
||
799 | * return to the calling routine or serious problems will occur. The return |
||
800 | * method used in the default routine calls longjmp(png_ptr->jmp_buf_ptr, 1) |
||
801 | */ |
||
802 | void PNGAPI |
||
803 | png_set_error_fn(png_structrp png_ptr, png_voidp error_ptr, |
||
804 | png_error_ptr error_fn, png_error_ptr warning_fn) |
||
805 | { |
||
806 | if (png_ptr == NULL) |
||
807 | return; |
||
808 | |||
809 | |||
810 | png_ptr->error_fn = error_fn; |
||
811 | #ifdef PNG_WARNINGS_SUPPORTED |
||
812 | png_ptr->warning_fn = warning_fn; |
||
813 | #else |
||
814 | PNG_UNUSED(warning_fn) |
||
815 | #endif |
||
816 | } |
||
817 | |||
818 | |||
819 | |||
820 | * functions. The application should free any memory associated with this |
||
821 | * pointer before png_write_destroy and png_read_destroy are called. |
||
822 | */ |
||
823 | png_voidp PNGAPI |
||
824 | png_get_error_ptr(png_const_structrp png_ptr) |
||
825 | { |
||
826 | if (png_ptr == NULL) |
||
827 | return NULL; |
||
828 | |||
829 | |||
830 | } |
||
831 | |||
832 | |||
833 | |||
834 | void PNGAPI |
||
835 | png_set_strip_error_numbers(png_structrp png_ptr, png_uint_32 strip_mode) |
||
836 | { |
||
837 | if (png_ptr != NULL) |
||
838 | { |
||
839 | png_ptr->flags &= |
||
840 | ((~(PNG_FLAG_STRIP_ERROR_NUMBERS | |
||
841 | PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode); |
||
842 | } |
||
843 | } |
||
844 | #endif |
||
845 | |||
846 | |||
847 | defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) |
||
848 | /* Currently the above both depend on SETJMP_SUPPORTED, however it would be |
||
849 | * possible to implement without setjmp support just so long as there is some |
||
850 | * way to handle the error return here: |
||
851 | */ |
||
852 | PNG_FUNCTION(void /* PRIVATE */, |
||
853 | png_safe_error,(png_structp png_nonconst_ptr, png_const_charp error_message), |
||
854 | PNG_NORETURN) |
||
855 | { |
||
856 | const png_const_structrp png_ptr = png_nonconst_ptr; |
||
857 | png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr); |
||
858 | |||
859 | |||
860 | * that is already there: |
||
861 | */ |
||
862 | if (image != NULL) |
||
863 | { |
||
864 | png_safecat(image->message, (sizeof image->message), 0, error_message); |
||
865 | image->warning_or_error |= PNG_IMAGE_ERROR; |
||
866 | |||
867 | |||
868 | * C++ compilation too is pretty tricky: C++ wants a pointer to the first |
||
869 | * element of a jmp_buf, but C doesn't tell us the type of that. |
||
870 | */ |
||
871 | if (image->opaque != NULL && image->opaque->error_buf != NULL) |
||
872 | longjmp(png_control_jmp_buf(image->opaque), 1); |
||
873 | |||
874 | |||
875 | { |
||
876 | size_t pos = png_safecat(image->message, (sizeof image->message), 0, |
||
877 | "bad longjmp: "); |
||
878 | png_safecat(image->message, (sizeof image->message), pos, |
||
879 | error_message); |
||
880 | } |
||
881 | } |
||
882 | |||
883 | |||
884 | abort(); |
||
885 | } |
||
886 | |||
887 | |||
888 | void /* PRIVATE */ |
||
889 | png_safe_warning(png_structp png_nonconst_ptr, png_const_charp warning_message) |
||
890 | { |
||
891 | const png_const_structrp png_ptr = png_nonconst_ptr; |
||
892 | png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr); |
||
893 | |||
894 | |||
895 | if (image->warning_or_error == 0) |
||
896 | { |
||
897 | png_safecat(image->message, (sizeof image->message), 0, warning_message); |
||
898 | image->warning_or_error |= PNG_IMAGE_WARNING; |
||
899 | } |
||
900 | } |
||
901 | #endif |
||
902 | |||
903 | |||
904 | png_safe_execute(png_imagep image_in, int (*function)(png_voidp), png_voidp arg) |
||
905 | { |
||
906 | volatile png_imagep image = image_in; |
||
907 | volatile int result; |
||
908 | volatile png_voidp saved_error_buf; |
||
909 | jmp_buf safe_jmpbuf; |
||
910 | |||
911 | |||
912 | saved_error_buf = image->opaque->error_buf; |
||
913 | result = setjmp(safe_jmpbuf) == 0; |
||
914 | |||
915 | |||
916 | { |
||
917 | |||
918 | |||
919 | result = function(arg); |
||
920 | } |
||
921 | |||
922 | |||
923 | |||
924 | |||
925 | if (!result) |
||
926 | png_image_free(image); |
||
927 | |||
928 | |||
929 | } |
||
930 | #endif /* SIMPLIFIED READ/WRITE */ |
||
931 | #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */>>>15;>=>>>>>>>>>(sizeof>>(sizeof>>>=>>>>>>15;> |
||
932 |