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Rev | Author | Line No. | Line |
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96 | giacomo | 1 | |
2 | /* pngerror.c - stub functions for i/o and memory allocation |
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3 | * |
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4 | * libpng 1.2.5 - October 3, 2002 |
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5 | * For conditions of distribution and use, see copyright notice in png.h |
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6 | * Copyright (c) 1998-2002 Glenn Randers-Pehrson |
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7 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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8 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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9 | * |
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10 | * This file provides a location for all error handling. Users who |
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11 | * need special error handling are expected to write replacement functions |
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12 | * and use png_set_error_fn() to use those functions. See the instructions |
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13 | * at each function. |
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14 | */ |
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15 | |||
16 | #define PNG_INTERNAL |
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17 | #include "png.h" |
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18 | |||
19 | static void /* PRIVATE */ |
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20 | png_default_error PNGARG((png_structp png_ptr, |
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21 | png_const_charp error_message)); |
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22 | static void /* PRIVATE */ |
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23 | png_default_warning PNGARG((png_structp png_ptr, |
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24 | png_const_charp warning_message)); |
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25 | |||
26 | /* This function is called whenever there is a fatal error. This function |
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27 | * should not be changed. If there is a need to handle errors differently, |
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28 | * you should supply a replacement error function and use png_set_error_fn() |
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29 | * to replace the error function at run-time. |
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30 | */ |
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31 | void PNGAPI |
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32 | png_error(png_structp png_ptr, png_const_charp error_message) |
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33 | { |
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34 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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35 | char msg[16]; |
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36 | if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) |
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37 | { |
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38 | int offset = 0; |
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39 | if (*error_message == '#') |
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40 | { |
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41 | for (offset=1; offset<15; offset++) |
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42 | if (*(error_message+offset) == ' ') |
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43 | break; |
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44 | if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) |
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45 | { |
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46 | int i; |
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47 | for (i=0; i<offset-1; i++) |
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48 | msg[i]=error_message[i+1]; |
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49 | msg[i]='\0'; |
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50 | error_message=msg; |
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51 | } |
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52 | else |
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53 | error_message+=offset; |
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54 | } |
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55 | else |
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56 | { |
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57 | if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT) |
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58 | { |
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59 | msg[0]='0'; |
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60 | msg[1]='\0'; |
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61 | error_message=msg; |
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62 | } |
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63 | } |
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64 | } |
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65 | #endif |
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66 | if (png_ptr->error_fn != NULL) |
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67 | (*(png_ptr->error_fn))(png_ptr, error_message); |
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68 | |||
69 | /* if the following returns or doesn't exist, use the default function, |
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70 | which will not return */ |
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71 | png_default_error(png_ptr, error_message); |
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72 | } |
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73 | |||
74 | /* This function is called whenever there is a non-fatal error. This function |
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75 | * should not be changed. If there is a need to handle warnings differently, |
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76 | * you should supply a replacement warning function and use |
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77 | * png_set_error_fn() to replace the warning function at run-time. |
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78 | */ |
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79 | void PNGAPI |
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80 | png_warning(png_structp png_ptr, png_const_charp warning_message) |
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81 | { |
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82 | int offset = 0; |
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83 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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84 | if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) |
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85 | #endif |
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86 | { |
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87 | if (*warning_message == '#') |
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88 | { |
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89 | for (offset=1; offset<15; offset++) |
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90 | if (*(warning_message+offset) == ' ') |
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91 | break; |
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92 | } |
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93 | } |
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94 | if (png_ptr->warning_fn != NULL) |
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95 | (*(png_ptr->warning_fn))(png_ptr, |
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96 | (png_const_charp)(warning_message+offset)); |
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97 | else |
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98 | png_default_warning(png_ptr, (png_const_charp)(warning_message+offset)); |
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99 | } |
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100 | |||
101 | /* These utilities are used internally to build an error message that relates |
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102 | * to the current chunk. The chunk name comes from png_ptr->chunk_name, |
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103 | * this is used to prefix the message. The message is limited in length |
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104 | * to 63 bytes, the name characters are output as hex digits wrapped in [] |
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105 | * if the character is invalid. |
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106 | */ |
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107 | #define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97)) |
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108 | static PNG_CONST char png_digit[16] = { |
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109 | '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', |
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110 | 'F' }; |
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111 | |||
112 | static void /* PRIVATE */ |
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113 | png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp |
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114 | error_message) |
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115 | { |
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116 | int iout = 0, iin = 0; |
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117 | |||
118 | while (iin < 4) |
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119 | { |
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120 | int c = png_ptr->chunk_name[iin++]; |
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121 | if (isnonalpha(c)) |
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122 | { |
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123 | buffer[iout++] = '['; |
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124 | buffer[iout++] = png_digit[(c & 0xf0) >> 4]; |
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125 | buffer[iout++] = png_digit[c & 0x0f]; |
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126 | buffer[iout++] = ']'; |
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127 | } |
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128 | else |
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129 | { |
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130 | buffer[iout++] = (png_byte)c; |
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131 | } |
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132 | } |
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133 | |||
134 | if (error_message == NULL) |
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135 | buffer[iout] = 0; |
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136 | else |
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137 | { |
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138 | buffer[iout++] = ':'; |
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139 | buffer[iout++] = ' '; |
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140 | png_memcpy(buffer+iout, error_message, 64); |
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141 | buffer[iout+63] = 0; |
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142 | } |
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143 | } |
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144 | |||
145 | void PNGAPI |
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146 | png_chunk_error(png_structp png_ptr, png_const_charp error_message) |
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147 | { |
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148 | char msg[18+64]; |
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149 | png_format_buffer(png_ptr, msg, error_message); |
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150 | png_error(png_ptr, msg); |
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151 | } |
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152 | |||
153 | void PNGAPI |
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154 | png_chunk_warning(png_structp png_ptr, png_const_charp warning_message) |
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155 | { |
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156 | char msg[18+64]; |
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157 | png_format_buffer(png_ptr, msg, warning_message); |
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158 | png_warning(png_ptr, msg); |
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159 | } |
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160 | |||
161 | /* This is the default error handling function. Note that replacements for |
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162 | * this function MUST NOT RETURN, or the program will likely crash. This |
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163 | * function is used by default, or if the program supplies NULL for the |
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164 | * error function pointer in png_set_error_fn(). |
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165 | */ |
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166 | static void /* PRIVATE */ |
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167 | png_default_error(png_structp png_ptr, png_const_charp error_message) |
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168 | { |
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169 | #ifndef PNG_NO_CONSOLE_IO |
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170 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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171 | if (*error_message == '#') |
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172 | { |
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173 | int offset; |
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174 | char error_number[16]; |
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175 | for (offset=0; offset<15; offset++) |
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176 | { |
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177 | error_number[offset] = *(error_message+offset+1); |
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178 | if (*(error_message+offset) == ' ') |
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179 | break; |
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180 | } |
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181 | if((offset > 1) && (offset < 15)) |
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182 | { |
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183 | error_number[offset-1]='\0'; |
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184 | cprintf("libpng error no. %s: %s\n", error_number, |
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185 | error_message+offset); |
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186 | } |
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187 | else |
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188 | cprintf("libpng error: %s, offset=%d\n", error_message,offset); |
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189 | } |
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190 | else |
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191 | #endif |
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192 | cprintf("libpng error: %s\n", error_message); |
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193 | #else |
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194 | if (error_message) |
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195 | /* make compiler happy */ ; |
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196 | #endif |
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197 | |||
198 | #ifdef PNG_SETJMP_SUPPORTED |
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199 | # ifdef USE_FAR_KEYWORD |
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200 | { |
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201 | jmp_buf jmpbuf; |
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202 | png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf)); |
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203 | longjmp(jmpbuf, 1); |
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204 | } |
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205 | # else |
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206 | longjmp(png_ptr->jmpbuf, 1); |
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207 | # endif |
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208 | #else |
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209 | if (png_ptr) |
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210 | /* make compiler happy */ ; |
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211 | PNG_ABORT(); |
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212 | #endif |
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213 | } |
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214 | |||
215 | /* This function is called when there is a warning, but the library thinks |
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216 | * it can continue anyway. Replacement functions don't have to do anything |
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217 | * here if you don't want them to. In the default configuration, png_ptr is |
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218 | * not used, but it is passed in case it may be useful. |
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219 | */ |
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220 | static void /* PRIVATE */ |
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221 | png_default_warning(png_structp png_ptr, png_const_charp warning_message) |
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222 | { |
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223 | #ifndef PNG_NO_CONSOLE_IO |
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224 | # ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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225 | if (*warning_message == '#') |
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226 | { |
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227 | int offset; |
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228 | char warning_number[16]; |
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229 | for (offset=0; offset<15; offset++) |
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230 | { |
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231 | warning_number[offset]=*(warning_message+offset+1); |
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232 | if (*(warning_message+offset) == ' ') |
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233 | break; |
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234 | } |
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235 | if((offset > 1) && (offset < 15)) |
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236 | { |
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237 | warning_number[offset-1]='\0'; |
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238 | cprintf("libpng warning no. %s: %s\n", warning_number, |
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239 | warning_message+offset); |
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240 | } |
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241 | else |
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242 | cprintf("libpng warning: %s\n", warning_message); |
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243 | } |
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244 | else |
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245 | # endif |
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246 | cprintf("libpng warning: %s\n", warning_message); |
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247 | #else |
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248 | if (warning_message) |
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249 | /* appease compiler */ ; |
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250 | #endif |
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251 | if (png_ptr) |
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252 | return; |
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253 | } |
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254 | |||
255 | /* This function is called when the application wants to use another method |
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256 | * of handling errors and warnings. Note that the error function MUST NOT |
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257 | * return to the calling routine or serious problems will occur. The return |
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258 | * method used in the default routine calls longjmp(png_ptr->jmpbuf, 1) |
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259 | */ |
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260 | void PNGAPI |
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261 | png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, |
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262 | png_error_ptr error_fn, png_error_ptr warning_fn) |
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263 | { |
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264 | png_ptr->error_ptr = error_ptr; |
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265 | png_ptr->error_fn = error_fn; |
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266 | png_ptr->warning_fn = warning_fn; |
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267 | } |
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268 | |||
269 | |||
270 | /* This function returns a pointer to the error_ptr associated with the user |
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271 | * functions. The application should free any memory associated with this |
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272 | * pointer before png_write_destroy and png_read_destroy are called. |
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273 | */ |
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274 | png_voidp PNGAPI |
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275 | png_get_error_ptr(png_structp png_ptr) |
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276 | { |
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277 | return ((png_voidp)png_ptr->error_ptr); |
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278 | } |
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279 | |||
280 | |||
281 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
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282 | void PNGAPI |
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283 | png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode) |
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284 | { |
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285 | if(png_ptr != NULL) |
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286 | { |
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287 | png_ptr->flags &= |
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288 | ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode); |
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289 | } |
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290 | } |
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291 | #endif |