1 | |
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2 | /* pngerror.c - stub functions for i/o and memory allocation |
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3 | * |
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4 | * Last changed in libpng 1.5.8 [February 1, 2011] |
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5 | * Copyright (c) 1998-2011 Glenn Randers-Pehrson |
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6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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8 | * |
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9 | * This code is released under the libpng license. |
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10 | * For conditions of distribution and use, see the disclaimer |
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11 | * and license in png.h |
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12 | * |
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13 | * This file provides a location for all error handling. Users who |
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14 | * need special error handling are expected to write replacement functions |
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15 | * and use png_set_error_fn() to use those functions. See the instructions |
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16 | * at each function. |
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17 | */ |
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18 | |
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19 | #include "pngpriv.h" |
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20 | |
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21 | #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) |
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22 | |
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23 | static PNG_FUNCTION(void, png_default_error,PNGARG((png_structp png_ptr, |
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24 | png_const_charp error_message)),PNG_NORETURN); |
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25 | |
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26 | #ifdef PNG_WARNINGS_SUPPORTED |
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27 | static void /* PRIVATE */ |
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28 | png_default_warning PNGARG((png_structp png_ptr, |
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29 | png_const_charp warning_message)); |
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30 | #endif /* PNG_WARNINGS_SUPPORTED */ |
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31 | |
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32 | /* This function is called whenever there is a fatal error. This function |
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33 | * should not be changed. If there is a need to handle errors differently, |
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34 | * you should supply a replacement error function and use png_set_error_fn() |
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35 | * to replace the error function at run-time. |
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36 | */ |
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37 | #ifdef PNG_ERROR_TEXT_SUPPORTED |
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38 | PNG_FUNCTION(void,PNGAPI |
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39 | png_error,(png_structp png_ptr, png_const_charp error_message),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 | |
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56 | if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) |
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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 | |
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65 | else |
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66 | error_message += offset; |
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67 | } |
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68 | |
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69 | else |
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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_ptr, error_message); |
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83 | |
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84 | /* If the custom handler doesn't exist, or if it returns, |
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85 | use the default handler, which will not return. */ |
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86 | png_default_error(png_ptr, error_message); |
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87 | } |
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88 | #else |
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89 | PNG_FUNCTION(void,PNGAPI |
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90 | png_err,(png_structp png_ptr),PNG_NORETURN) |
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91 | { |
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92 | /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed |
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93 | * erroneously as '\0', instead of the empty string "". This was |
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94 | * apparently an error, introduced in libpng-1.2.20, and png_default_error |
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95 | * will crash in this case. |
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96 | */ |
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97 | if (png_ptr != NULL && png_ptr->error_fn != NULL) |
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98 | (*(png_ptr->error_fn))(png_ptr, ""); |
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99 | |
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100 | /* If the custom handler doesn't exist, or if it returns, |
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101 | use the default handler, which will not return. */ |
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102 | png_default_error(png_ptr, ""); |
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103 | } |
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104 | #endif /* PNG_ERROR_TEXT_SUPPORTED */ |
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105 | |
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106 | /* Utility to safely appends strings to a buffer. This never errors out so |
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107 | * error checking is not required in the caller. |
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108 | */ |
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109 | size_t |
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110 | png_safecat(png_charp buffer, size_t bufsize, size_t pos, |
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111 | png_const_charp string) |
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112 | { |
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113 | if (buffer != NULL && pos < bufsize) |
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114 | { |
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115 | if (string != NULL) |
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116 | while (*string != '\0' && pos < bufsize-1) |
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117 | buffer[pos++] = *string++; |
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118 | |
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119 | buffer[pos] = '\0'; |
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120 | } |
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121 | |
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122 | return pos; |
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123 | } |
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124 | |
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125 | #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) |
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126 | /* Utility to dump an unsigned value into a buffer, given a start pointer and |
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127 | * and end pointer (which should point just *beyond* the end of the buffer!) |
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128 | * Returns the pointer to the start of the formatted string. |
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129 | */ |
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130 | png_charp |
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131 | png_format_number(png_const_charp start, png_charp end, int format, |
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132 | png_alloc_size_t number) |
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133 | { |
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134 | int count = 0; /* number of digits output */ |
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135 | int mincount = 1; /* minimum number required */ |
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136 | int output = 0; /* digit output (for the fixed point format) */ |
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137 | |
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138 | *--end = '\0'; |
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139 | |
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140 | /* This is written so that the loop always runs at least once, even with |
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141 | * number zero. |
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142 | */ |
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143 | while (end > start && (number != 0 || count < mincount)) |
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144 | { |
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145 | |
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146 | static const char digits[] = "0123456789ABCDEF"; |
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147 | |
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148 | switch (format) |
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149 | { |
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150 | case PNG_NUMBER_FORMAT_fixed: |
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151 | /* Needs five digits (the fraction) */ |
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152 | mincount = 5; |
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153 | if (output || number % 10 != 0) |
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154 | { |
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155 | *--end = digits[number % 10]; |
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156 | output = 1; |
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157 | } |
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158 | number /= 10; |
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159 | break; |
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160 | |
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161 | case PNG_NUMBER_FORMAT_02u: |
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162 | /* Expects at least 2 digits. */ |
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163 | mincount = 2; |
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164 | /* fall through */ |
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165 | |
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166 | case PNG_NUMBER_FORMAT_u: |
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167 | *--end = digits[number % 10]; |
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168 | number /= 10; |
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169 | break; |
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170 | |
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171 | case PNG_NUMBER_FORMAT_02x: |
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172 | /* This format expects at least two digits */ |
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173 | mincount = 2; |
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174 | /* fall through */ |
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175 | |
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176 | case PNG_NUMBER_FORMAT_x: |
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177 | *--end = digits[number & 0xf]; |
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178 | number >>= 4; |
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179 | break; |
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180 | |
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181 | default: /* an error */ |
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182 | number = 0; |
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183 | break; |
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184 | } |
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185 | |
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186 | /* Keep track of the number of digits added */ |
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187 | ++count; |
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188 | |
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189 | /* Float a fixed number here: */ |
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190 | if (format == PNG_NUMBER_FORMAT_fixed) if (count == 5) if (end > start) |
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191 | { |
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192 | /* End of the fraction, but maybe nothing was output? In that case |
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193 | * drop the decimal point. If the number is a true zero handle that |
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194 | * here. |
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195 | */ |
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196 | if (output) |
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197 | *--end = '.'; |
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198 | else if (number == 0) /* and !output */ |
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199 | *--end = '0'; |
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200 | } |
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201 | } |
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202 | |
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203 | return end; |
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204 | } |
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205 | #endif |
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206 | |
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207 | #ifdef PNG_WARNINGS_SUPPORTED |
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208 | /* This function is called whenever there is a non-fatal error. This function |
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209 | * should not be changed. If there is a need to handle warnings differently, |
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210 | * you should supply a replacement warning function and use |
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211 | * png_set_error_fn() to replace the warning function at run-time. |
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212 | */ |
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213 | void PNGAPI |
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214 | png_warning(png_structp png_ptr, png_const_charp warning_message) |
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215 | { |
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216 | int offset = 0; |
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217 | if (png_ptr != NULL) |
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218 | { |
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219 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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220 | if (png_ptr->flags& |
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221 | (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) |
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222 | #endif |
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223 | { |
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224 | if (*warning_message == PNG_LITERAL_SHARP) |
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225 | { |
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226 | for (offset = 1; offset < 15; offset++) |
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227 | if (warning_message[offset] == ' ') |
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228 | break; |
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229 | } |
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230 | } |
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231 | } |
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232 | if (png_ptr != NULL && png_ptr->warning_fn != NULL) |
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233 | (*(png_ptr->warning_fn))(png_ptr, warning_message + offset); |
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234 | else |
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235 | png_default_warning(png_ptr, warning_message + offset); |
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236 | } |
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237 | |
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238 | /* These functions support 'formatted' warning messages with up to |
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239 | * PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter |
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240 | * is introduced by @<number>, where 'number' starts at 1. This follows the |
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241 | * standard established by X/Open for internationalizable error messages. |
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242 | */ |
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243 | void |
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244 | png_warning_parameter(png_warning_parameters p, int number, |
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245 | png_const_charp string) |
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246 | { |
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247 | if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT) |
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248 | (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string); |
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249 | } |
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250 | |
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251 | void |
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252 | png_warning_parameter_unsigned(png_warning_parameters p, int number, int format, |
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253 | png_alloc_size_t value) |
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254 | { |
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255 | char buffer[PNG_NUMBER_BUFFER_SIZE]; |
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256 | png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value)); |
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257 | } |
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258 | |
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259 | void |
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260 | png_warning_parameter_signed(png_warning_parameters p, int number, int format, |
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261 | png_int_32 value) |
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262 | { |
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263 | png_alloc_size_t u; |
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264 | png_charp str; |
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265 | char buffer[PNG_NUMBER_BUFFER_SIZE]; |
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266 | |
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267 | /* Avoid overflow by doing the negate in a png_alloc_size_t: */ |
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268 | u = (png_alloc_size_t)value; |
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269 | if (value < 0) |
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270 | u = ~u + 1; |
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271 | |
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272 | str = PNG_FORMAT_NUMBER(buffer, format, u); |
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273 | |
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274 | if (value < 0 && str > buffer) |
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275 | *--str = '-'; |
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276 | |
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277 | png_warning_parameter(p, number, str); |
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278 | } |
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279 | |
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280 | void |
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281 | png_formatted_warning(png_structp png_ptr, png_warning_parameters p, |
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282 | png_const_charp message) |
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283 | { |
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284 | /* The internal buffer is just 192 bytes - enough for all our messages, |
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285 | * overflow doesn't happen because this code checks! If someone figures |
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286 | * out how to send us a message longer than 192 bytes, all that will |
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287 | * happen is that the message will be truncated appropriately. |
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288 | */ |
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289 | size_t i = 0; /* Index in the msg[] buffer: */ |
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290 | char msg[192]; |
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291 | |
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292 | /* Each iteration through the following loop writes at most one character |
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293 | * to msg[i++] then returns here to validate that there is still space for |
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294 | * the trailing '\0'. It may (in the case of a parameter) read more than |
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295 | * one character from message[]; it must check for '\0' and continue to the |
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296 | * test if it finds the end of string. |
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297 | */ |
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298 | while (i<(sizeof msg)-1 && *message != '\0') |
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299 | { |
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300 | /* '@' at end of string is now just printed (previously it was skipped); |
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301 | * it is an error in the calling code to terminate the string with @. |
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302 | */ |
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303 | if (p != NULL && *message == '@' && message[1] != '\0') |
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304 | { |
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305 | int parameter_char = *++message; /* Consume the '@' */ |
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306 | static const char valid_parameters[] = "123456789"; |
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307 | int parameter = 0; |
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308 | |
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309 | /* Search for the parameter digit, the index in the string is the |
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310 | * parameter to use. |
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311 | */ |
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312 | while (valid_parameters[parameter] != parameter_char && |
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313 | valid_parameters[parameter] != '\0') |
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314 | ++parameter; |
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315 | |
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316 | /* If the parameter digit is out of range it will just get printed. */ |
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317 | if (parameter < PNG_WARNING_PARAMETER_COUNT) |
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318 | { |
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319 | /* Append this parameter */ |
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320 | png_const_charp parm = p[parameter]; |
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321 | png_const_charp pend = p[parameter] + (sizeof p[parameter]); |
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322 | |
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323 | /* No need to copy the trailing '\0' here, but there is no guarantee |
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324 | * that parm[] has been initialized, so there is no guarantee of a |
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325 | * trailing '\0': |
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326 | */ |
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327 | while (i<(sizeof msg)-1 && *parm != '\0' && parm < pend) |
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328 | msg[i++] = *parm++; |
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329 | |
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330 | /* Consume the parameter digit too: */ |
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331 | ++message; |
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332 | continue; |
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333 | } |
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334 | |
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335 | /* else not a parameter and there is a character after the @ sign; just |
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336 | * copy that. This is known not to be '\0' because of the test above. |
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337 | */ |
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338 | } |
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339 | |
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340 | /* At this point *message can't be '\0', even in the bad parameter case |
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341 | * above where there is a lone '@' at the end of the message string. |
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342 | */ |
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343 | msg[i++] = *message++; |
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344 | } |
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345 | |
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346 | /* i is always less than (sizeof msg), so: */ |
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347 | msg[i] = '\0'; |
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348 | |
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349 | /* And this is the formatted message, it may be larger than |
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350 | * PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these are |
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351 | * not (currently) formatted. |
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352 | */ |
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353 | png_warning(png_ptr, msg); |
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354 | } |
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355 | #endif /* PNG_WARNINGS_SUPPORTED */ |
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356 | |
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357 | #ifdef PNG_BENIGN_ERRORS_SUPPORTED |
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358 | void PNGAPI |
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359 | png_benign_error(png_structp png_ptr, png_const_charp error_message) |
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360 | { |
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361 | if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) |
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362 | png_warning(png_ptr, error_message); |
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363 | else |
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364 | png_error(png_ptr, error_message); |
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365 | } |
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366 | #endif |
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367 | |
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368 | /* These utilities are used internally to build an error message that relates |
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369 | * to the current chunk. The chunk name comes from png_ptr->chunk_name, |
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370 | * this is used to prefix the message. The message is limited in length |
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371 | * to 63 bytes, the name characters are output as hex digits wrapped in [] |
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372 | * if the character is invalid. |
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373 | */ |
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374 | #define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) |
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375 | static PNG_CONST char png_digit[16] = { |
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376 | '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', |
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377 | 'A', 'B', 'C', 'D', 'E', 'F' |
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378 | }; |
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379 | |
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380 | #define PNG_MAX_ERROR_TEXT 64 |
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381 | #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED) |
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382 | static void /* PRIVATE */ |
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383 | png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp |
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384 | error_message) |
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385 | { |
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386 | png_uint_32 chunk_name = png_ptr->chunk_name; |
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387 | int iout = 0, ishift = 24; |
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388 | |
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389 | while (ishift >= 0) |
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390 | { |
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391 | int c = (int)(chunk_name >> ishift) & 0xff; |
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392 | |
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393 | ishift -= 8; |
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394 | if (isnonalpha(c)) |
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395 | { |
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396 | buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET; |
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397 | buffer[iout++] = png_digit[(c & 0xf0) >> 4]; |
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398 | buffer[iout++] = png_digit[c & 0x0f]; |
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399 | buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET; |
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400 | } |
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401 | |
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402 | else |
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403 | { |
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404 | buffer[iout++] = (char)c; |
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405 | } |
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406 | } |
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407 | |
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408 | if (error_message == NULL) |
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409 | buffer[iout] = '\0'; |
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410 | |
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411 | else |
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412 | { |
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413 | int iin = 0; |
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414 | |
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415 | buffer[iout++] = ':'; |
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416 | buffer[iout++] = ' '; |
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417 | |
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418 | while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0') |
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419 | buffer[iout++] = error_message[iin++]; |
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420 | |
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421 | /* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */ |
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422 | buffer[iout] = '\0'; |
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423 | } |
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424 | } |
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425 | #endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */ |
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426 | |
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427 | #if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) |
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428 | PNG_FUNCTION(void,PNGAPI |
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429 | png_chunk_error,(png_structp png_ptr, png_const_charp error_message), |
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430 | PNG_NORETURN) |
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431 | { |
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432 | char msg[18+PNG_MAX_ERROR_TEXT]; |
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433 | if (png_ptr == NULL) |
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434 | png_error(png_ptr, error_message); |
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435 | |
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436 | else |
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437 | { |
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438 | png_format_buffer(png_ptr, msg, error_message); |
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439 | png_error(png_ptr, msg); |
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440 | } |
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441 | } |
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442 | #endif /* PNG_READ_SUPPORTED && PNG_ERROR_TEXT_SUPPORTED */ |
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443 | |
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444 | #ifdef PNG_WARNINGS_SUPPORTED |
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445 | void PNGAPI |
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446 | png_chunk_warning(png_structp png_ptr, png_const_charp warning_message) |
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447 | { |
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448 | char msg[18+PNG_MAX_ERROR_TEXT]; |
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449 | if (png_ptr == NULL) |
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450 | png_warning(png_ptr, warning_message); |
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451 | |
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452 | else |
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453 | { |
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454 | png_format_buffer(png_ptr, msg, warning_message); |
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455 | png_warning(png_ptr, msg); |
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456 | } |
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457 | } |
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458 | #endif /* PNG_WARNINGS_SUPPORTED */ |
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459 | |
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460 | #ifdef PNG_READ_SUPPORTED |
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461 | #ifdef PNG_BENIGN_ERRORS_SUPPORTED |
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462 | void PNGAPI |
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463 | png_chunk_benign_error(png_structp png_ptr, png_const_charp error_message) |
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464 | { |
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465 | if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) |
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466 | png_chunk_warning(png_ptr, error_message); |
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467 | |
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468 | else |
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469 | png_chunk_error(png_ptr, error_message); |
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470 | } |
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471 | #endif |
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472 | #endif /* PNG_READ_SUPPORTED */ |
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473 | |
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474 | #ifdef PNG_ERROR_TEXT_SUPPORTED |
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475 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
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476 | PNG_FUNCTION(void, |
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477 | png_fixed_error,(png_structp png_ptr, png_const_charp name),PNG_NORETURN) |
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478 | { |
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479 | # define fixed_message "fixed point overflow in " |
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480 | # define fixed_message_ln ((sizeof fixed_message)-1) |
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481 | int iin; |
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482 | char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT]; |
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483 | png_memcpy(msg, fixed_message, fixed_message_ln); |
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484 | iin = 0; |
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485 | if (name != NULL) while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0) |
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486 | { |
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487 | msg[fixed_message_ln + iin] = name[iin]; |
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488 | ++iin; |
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489 | } |
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490 | msg[fixed_message_ln + iin] = 0; |
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491 | png_error(png_ptr, msg); |
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492 | } |
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493 | #endif |
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494 | #endif |
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495 | |
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496 | #ifdef PNG_SETJMP_SUPPORTED |
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497 | /* This API only exists if ANSI-C style error handling is used, |
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498 | * otherwise it is necessary for png_default_error to be overridden. |
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499 | */ |
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500 | jmp_buf* PNGAPI |
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501 | png_set_longjmp_fn(png_structp png_ptr, png_longjmp_ptr longjmp_fn, |
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502 | size_t jmp_buf_size) |
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503 | { |
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504 | if (png_ptr == NULL || jmp_buf_size != png_sizeof(jmp_buf)) |
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505 | return NULL; |
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506 | |
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507 | png_ptr->longjmp_fn = longjmp_fn; |
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508 | return &png_ptr->longjmp_buffer; |
---|
509 | } |
---|
510 | #endif |
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511 | |
---|
512 | /* This is the default error handling function. Note that replacements for |
---|
513 | * this function MUST NOT RETURN, or the program will likely crash. This |
---|
514 | * function is used by default, or if the program supplies NULL for the |
---|
515 | * error function pointer in png_set_error_fn(). |
---|
516 | */ |
---|
517 | static PNG_FUNCTION(void /* PRIVATE */, |
---|
518 | png_default_error,(png_structp png_ptr, png_const_charp error_message), |
---|
519 | PNG_NORETURN) |
---|
520 | { |
---|
521 | #ifdef PNG_CONSOLE_IO_SUPPORTED |
---|
522 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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523 | /* Check on NULL only added in 1.5.4 */ |
---|
524 | if (error_message != NULL && *error_message == PNG_LITERAL_SHARP) |
---|
525 | { |
---|
526 | /* Strip "#nnnn " from beginning of error message. */ |
---|
527 | int offset; |
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528 | char error_number[16]; |
---|
529 | for (offset = 0; offset<15; offset++) |
---|
530 | { |
---|
531 | error_number[offset] = error_message[offset + 1]; |
---|
532 | if (error_message[offset] == ' ') |
---|
533 | break; |
---|
534 | } |
---|
535 | |
---|
536 | if ((offset > 1) && (offset < 15)) |
---|
537 | { |
---|
538 | error_number[offset - 1] = '\0'; |
---|
539 | fprintf(stderr, "libpng error no. %s: %s", |
---|
540 | error_number, error_message + offset + 1); |
---|
541 | fprintf(stderr, PNG_STRING_NEWLINE); |
---|
542 | } |
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543 | |
---|
544 | else |
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545 | { |
---|
546 | fprintf(stderr, "libpng error: %s, offset=%d", |
---|
547 | error_message, offset); |
---|
548 | fprintf(stderr, PNG_STRING_NEWLINE); |
---|
549 | } |
---|
550 | } |
---|
551 | else |
---|
552 | #endif |
---|
553 | { |
---|
554 | fprintf(stderr, "libpng error: %s", error_message ? error_message : |
---|
555 | "undefined"); |
---|
556 | fprintf(stderr, PNG_STRING_NEWLINE); |
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557 | } |
---|
558 | #else |
---|
559 | PNG_UNUSED(error_message) /* Make compiler happy */ |
---|
560 | #endif |
---|
561 | png_longjmp(png_ptr, 1); |
---|
562 | } |
---|
563 | |
---|
564 | PNG_FUNCTION(void,PNGAPI |
---|
565 | png_longjmp,(png_structp png_ptr, int val),PNG_NORETURN) |
---|
566 | { |
---|
567 | #ifdef PNG_SETJMP_SUPPORTED |
---|
568 | if (png_ptr && png_ptr->longjmp_fn) |
---|
569 | { |
---|
570 | # ifdef USE_FAR_KEYWORD |
---|
571 | { |
---|
572 | jmp_buf tmp_jmpbuf; |
---|
573 | png_memcpy(tmp_jmpbuf, png_ptr->longjmp_buffer, png_sizeof(jmp_buf)); |
---|
574 | png_ptr->longjmp_fn(tmp_jmpbuf, val); |
---|
575 | } |
---|
576 | |
---|
577 | # else |
---|
578 | png_ptr->longjmp_fn(png_ptr->longjmp_buffer, val); |
---|
579 | # endif |
---|
580 | } |
---|
581 | #endif |
---|
582 | /* Here if not setjmp support or if png_ptr is null. */ |
---|
583 | PNG_ABORT(); |
---|
584 | } |
---|
585 | |
---|
586 | #ifdef PNG_WARNINGS_SUPPORTED |
---|
587 | /* This function is called when there is a warning, but the library thinks |
---|
588 | * it can continue anyway. Replacement functions don't have to do anything |
---|
589 | * here if you don't want them to. In the default configuration, png_ptr is |
---|
590 | * not used, but it is passed in case it may be useful. |
---|
591 | */ |
---|
592 | static void /* PRIVATE */ |
---|
593 | png_default_warning(png_structp png_ptr, png_const_charp warning_message) |
---|
594 | { |
---|
595 | #ifdef PNG_CONSOLE_IO_SUPPORTED |
---|
596 | # ifdef PNG_ERROR_NUMBERS_SUPPORTED |
---|
597 | if (*warning_message == PNG_LITERAL_SHARP) |
---|
598 | { |
---|
599 | int offset; |
---|
600 | char warning_number[16]; |
---|
601 | for (offset = 0; offset < 15; offset++) |
---|
602 | { |
---|
603 | warning_number[offset] = warning_message[offset + 1]; |
---|
604 | if (warning_message[offset] == ' ') |
---|
605 | break; |
---|
606 | } |
---|
607 | |
---|
608 | if ((offset > 1) && (offset < 15)) |
---|
609 | { |
---|
610 | warning_number[offset + 1] = '\0'; |
---|
611 | fprintf(stderr, "libpng warning no. %s: %s", |
---|
612 | warning_number, warning_message + offset); |
---|
613 | fprintf(stderr, PNG_STRING_NEWLINE); |
---|
614 | } |
---|
615 | |
---|
616 | else |
---|
617 | { |
---|
618 | fprintf(stderr, "libpng warning: %s", |
---|
619 | warning_message); |
---|
620 | fprintf(stderr, PNG_STRING_NEWLINE); |
---|
621 | } |
---|
622 | } |
---|
623 | else |
---|
624 | # endif |
---|
625 | |
---|
626 | { |
---|
627 | fprintf(stderr, "libpng warning: %s", warning_message); |
---|
628 | fprintf(stderr, PNG_STRING_NEWLINE); |
---|
629 | } |
---|
630 | #else |
---|
631 | PNG_UNUSED(warning_message) /* Make compiler happy */ |
---|
632 | #endif |
---|
633 | PNG_UNUSED(png_ptr) /* Make compiler happy */ |
---|
634 | } |
---|
635 | #endif /* PNG_WARNINGS_SUPPORTED */ |
---|
636 | |
---|
637 | /* This function is called when the application wants to use another method |
---|
638 | * of handling errors and warnings. Note that the error function MUST NOT |
---|
639 | * return to the calling routine or serious problems will occur. The return |
---|
640 | * method used in the default routine calls longjmp(png_ptr->longjmp_buffer, 1) |
---|
641 | */ |
---|
642 | void PNGAPI |
---|
643 | png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, |
---|
644 | png_error_ptr error_fn, png_error_ptr warning_fn) |
---|
645 | { |
---|
646 | if (png_ptr == NULL) |
---|
647 | return; |
---|
648 | |
---|
649 | png_ptr->error_ptr = error_ptr; |
---|
650 | png_ptr->error_fn = error_fn; |
---|
651 | #ifdef PNG_WARNINGS_SUPPORTED |
---|
652 | png_ptr->warning_fn = warning_fn; |
---|
653 | #else |
---|
654 | PNG_UNUSED(warning_fn) |
---|
655 | #endif |
---|
656 | } |
---|
657 | |
---|
658 | |
---|
659 | /* This function returns a pointer to the error_ptr associated with the user |
---|
660 | * functions. The application should free any memory associated with this |
---|
661 | * pointer before png_write_destroy and png_read_destroy are called. |
---|
662 | */ |
---|
663 | png_voidp PNGAPI |
---|
664 | png_get_error_ptr(png_const_structp png_ptr) |
---|
665 | { |
---|
666 | if (png_ptr == NULL) |
---|
667 | return NULL; |
---|
668 | |
---|
669 | return ((png_voidp)png_ptr->error_ptr); |
---|
670 | } |
---|
671 | |
---|
672 | |
---|
673 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
---|
674 | void PNGAPI |
---|
675 | png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode) |
---|
676 | { |
---|
677 | if (png_ptr != NULL) |
---|
678 | { |
---|
679 | png_ptr->flags &= |
---|
680 | ((~(PNG_FLAG_STRIP_ERROR_NUMBERS | |
---|
681 | PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode); |
---|
682 | } |
---|
683 | } |
---|
684 | #endif |
---|
685 | #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ |
---|