2 /* pngerror.c - stub functions for i/o and memory allocation
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4 * Last changed in libpng 1.6.15 [November 20, 2014]
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5 * Copyright (c) 1998-2002,2004,2006-2014 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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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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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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19 #include "pngpriv.h"
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21 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
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23 static PNG_FUNCTION(void, png_default_error,PNGARG((png_const_structrp png_ptr,
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24 png_const_charp error_message)),PNG_NORETURN);
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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_const_structrp png_ptr,
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29 png_const_charp warning_message));
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30 #endif /* WARNINGS */
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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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37 #ifdef PNG_ERROR_TEXT_SUPPORTED
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38 PNG_FUNCTION(void,PNGAPI
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39 png_error,(png_const_structrp png_ptr, png_const_charp error_message),
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42 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
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44 if (png_ptr != NULL)
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46 if ((png_ptr->flags &
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47 (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) != 0)
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49 if (*error_message == PNG_LITERAL_SHARP)
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51 /* Strip "#nnnn " from beginning of error message. */
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53 for (offset = 1; offset<15; offset++)
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54 if (error_message[offset] == ' ')
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57 if ((png_ptr->flags & PNG_FLAG_STRIP_ERROR_TEXT) != 0)
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60 for (i = 0; i < offset - 1; i++)
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61 msg[i] = error_message[i + 1];
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63 error_message = msg;
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67 error_message += offset;
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72 if ((png_ptr->flags & PNG_FLAG_STRIP_ERROR_TEXT) != 0)
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76 error_message = msg;
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82 if (png_ptr != NULL && png_ptr->error_fn != NULL)
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83 (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr),
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86 /* If the custom handler doesn't exist, or if it returns,
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87 use the default handler, which will not return. */
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88 png_default_error(png_ptr, error_message);
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91 PNG_FUNCTION(void,PNGAPI
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92 png_err,(png_const_structrp png_ptr),PNG_NORETURN)
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94 /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed
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95 * erroneously as '\0', instead of the empty string "". This was
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96 * apparently an error, introduced in libpng-1.2.20, and png_default_error
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97 * will crash in this case.
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99 if (png_ptr != NULL && png_ptr->error_fn != NULL)
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100 (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), "");
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102 /* If the custom handler doesn't exist, or if it returns,
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103 use the default handler, which will not return. */
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104 png_default_error(png_ptr, "");
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106 #endif /* ERROR_TEXT */
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108 /* Utility to safely appends strings to a buffer. This never errors out so
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109 * error checking is not required in the caller.
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112 png_safecat(png_charp buffer, size_t bufsize, size_t pos,
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113 png_const_charp string)
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115 if (buffer != NULL && pos < bufsize)
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117 if (string != NULL)
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118 while (*string != '\0' && pos < bufsize-1)
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119 buffer[pos++] = *string++;
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121 buffer[pos] = '\0';
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127 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
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128 /* Utility to dump an unsigned value into a buffer, given a start pointer and
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129 * and end pointer (which should point just *beyond* the end of the buffer!)
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130 * Returns the pointer to the start of the formatted string.
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133 png_format_number(png_const_charp start, png_charp end, int format,
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134 png_alloc_size_t number)
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136 int count = 0; /* number of digits output */
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137 int mincount = 1; /* minimum number required */
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138 int output = 0; /* digit output (for the fixed point format) */
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142 /* This is written so that the loop always runs at least once, even with
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145 while (end > start && (number != 0 || count < mincount))
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148 static const char digits[] = "0123456789ABCDEF";
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152 case PNG_NUMBER_FORMAT_fixed:
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153 /* Needs five digits (the fraction) */
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155 if (output != 0 || number % 10 != 0)
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157 *--end = digits[number % 10];
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163 case PNG_NUMBER_FORMAT_02u:
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164 /* Expects at least 2 digits. */
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168 case PNG_NUMBER_FORMAT_u:
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169 *--end = digits[number % 10];
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173 case PNG_NUMBER_FORMAT_02x:
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174 /* This format expects at least two digits */
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178 case PNG_NUMBER_FORMAT_x:
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179 *--end = digits[number & 0xf];
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183 default: /* an error */
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188 /* Keep track of the number of digits added */
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191 /* Float a fixed number here: */
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192 if ((format == PNG_NUMBER_FORMAT_fixed) && (count == 5) && (end > start))
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194 /* End of the fraction, but maybe nothing was output? In that case
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195 * drop the decimal point. If the number is a true zero handle that
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200 else if (number == 0) /* and !output */
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209 #ifdef PNG_WARNINGS_SUPPORTED
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210 /* This function is called whenever there is a non-fatal error. This function
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211 * should not be changed. If there is a need to handle warnings differently,
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212 * you should supply a replacement warning function and use
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213 * png_set_error_fn() to replace the warning function at run-time.
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216 png_warning(png_const_structrp png_ptr, png_const_charp warning_message)
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219 if (png_ptr != NULL)
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221 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
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222 if ((png_ptr->flags &
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223 (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT)) != 0)
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226 if (*warning_message == PNG_LITERAL_SHARP)
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228 for (offset = 1; offset < 15; offset++)
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229 if (warning_message[offset] == ' ')
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234 if (png_ptr != NULL && png_ptr->warning_fn != NULL)
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235 (*(png_ptr->warning_fn))(png_constcast(png_structrp,png_ptr),
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236 warning_message + offset);
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238 png_default_warning(png_ptr, warning_message + offset);
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241 /* These functions support 'formatted' warning messages with up to
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242 * PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter
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243 * is introduced by @<number>, where 'number' starts at 1. This follows the
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244 * standard established by X/Open for internationalizable error messages.
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247 png_warning_parameter(png_warning_parameters p, int number,
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248 png_const_charp string)
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250 if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT)
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251 (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string);
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255 png_warning_parameter_unsigned(png_warning_parameters p, int number, int format,
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256 png_alloc_size_t value)
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258 char buffer[PNG_NUMBER_BUFFER_SIZE];
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259 png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value));
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263 png_warning_parameter_signed(png_warning_parameters p, int number, int format,
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266 png_alloc_size_t u;
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268 char buffer[PNG_NUMBER_BUFFER_SIZE];
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270 /* Avoid overflow by doing the negate in a png_alloc_size_t: */
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271 u = (png_alloc_size_t)value;
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275 str = PNG_FORMAT_NUMBER(buffer, format, u);
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277 if (value < 0 && str > buffer)
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280 png_warning_parameter(p, number, str);
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284 png_formatted_warning(png_const_structrp png_ptr, png_warning_parameters p,
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285 png_const_charp message)
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287 /* The internal buffer is just 192 bytes - enough for all our messages,
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288 * overflow doesn't happen because this code checks! If someone figures
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289 * out how to send us a message longer than 192 bytes, all that will
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290 * happen is that the message will be truncated appropriately.
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292 size_t i = 0; /* Index in the msg[] buffer: */
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295 /* Each iteration through the following loop writes at most one character
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296 * to msg[i++] then returns here to validate that there is still space for
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297 * the trailing '\0'. It may (in the case of a parameter) read more than
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298 * one character from message[]; it must check for '\0' and continue to the
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299 * test if it finds the end of string.
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301 while (i<(sizeof msg)-1 && *message != '\0')
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303 /* '@' at end of string is now just printed (previously it was skipped);
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304 * it is an error in the calling code to terminate the string with @.
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306 if (p != NULL && *message == '@' && message[1] != '\0')
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308 int parameter_char = *++message; /* Consume the '@' */
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309 static const char valid_parameters[] = "123456789";
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312 /* Search for the parameter digit, the index in the string is the
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313 * parameter to use.
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315 while (valid_parameters[parameter] != parameter_char &&
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316 valid_parameters[parameter] != '\0')
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319 /* If the parameter digit is out of range it will just get printed. */
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320 if (parameter < PNG_WARNING_PARAMETER_COUNT)
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322 /* Append this parameter */
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323 png_const_charp parm = p[parameter];
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324 png_const_charp pend = p[parameter] + (sizeof p[parameter]);
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326 /* No need to copy the trailing '\0' here, but there is no guarantee
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327 * that parm[] has been initialized, so there is no guarantee of a
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330 while (i<(sizeof msg)-1 && *parm != '\0' && parm < pend)
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331 msg[i++] = *parm++;
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333 /* Consume the parameter digit too: */
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338 /* else not a parameter and there is a character after the @ sign; just
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339 * copy that. This is known not to be '\0' because of the test above.
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343 /* At this point *message can't be '\0', even in the bad parameter case
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344 * above where there is a lone '@' at the end of the message string.
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346 msg[i++] = *message++;
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349 /* i is always less than (sizeof msg), so: */
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352 /* And this is the formatted message. It may be larger than
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353 * PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these
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354 * are not (currently) formatted.
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356 png_warning(png_ptr, msg);
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358 #endif /* WARNINGS */
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360 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
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362 png_benign_error(png_const_structrp png_ptr, png_const_charp error_message)
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364 if ((png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) != 0)
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366 # ifdef PNG_READ_SUPPORTED
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367 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
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368 png_ptr->chunk_name != 0)
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369 png_chunk_warning(png_ptr, error_message);
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372 png_warning(png_ptr, error_message);
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377 # ifdef PNG_READ_SUPPORTED
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378 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
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379 png_ptr->chunk_name != 0)
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380 png_chunk_error(png_ptr, error_message);
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383 png_error(png_ptr, error_message);
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386 # ifndef PNG_ERROR_TEXT_SUPPORTED
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387 PNG_UNUSED(error_message)
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392 png_app_warning(png_const_structrp png_ptr, png_const_charp error_message)
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394 if ((png_ptr->flags & PNG_FLAG_APP_WARNINGS_WARN) != 0)
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395 png_warning(png_ptr, error_message);
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397 png_error(png_ptr, error_message);
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399 # ifndef PNG_ERROR_TEXT_SUPPORTED
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400 PNG_UNUSED(error_message)
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405 png_app_error(png_const_structrp png_ptr, png_const_charp error_message)
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407 if ((png_ptr->flags & PNG_FLAG_APP_ERRORS_WARN) != 0)
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408 png_warning(png_ptr, error_message);
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410 png_error(png_ptr, error_message);
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412 # ifndef PNG_ERROR_TEXT_SUPPORTED
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413 PNG_UNUSED(error_message)
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416 #endif /* BENIGN_ERRORS */
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418 #define PNG_MAX_ERROR_TEXT 196 /* Currently limited by profile_error in png.c */
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419 #if defined(PNG_WARNINGS_SUPPORTED) || \
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420 (defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED))
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421 /* These utilities are used internally to build an error message that relates
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422 * to the current chunk. The chunk name comes from png_ptr->chunk_name,
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423 * which is used to prefix the message. The message is limited in length
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424 * to 63 bytes. The name characters are output as hex digits wrapped in []
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425 * if the character is invalid.
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427 #define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
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428 static PNG_CONST char png_digit[16] = {
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429 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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430 'A', 'B', 'C', 'D', 'E', 'F'
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433 static void /* PRIVATE */
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434 png_format_buffer(png_const_structrp png_ptr, png_charp buffer, png_const_charp
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437 png_uint_32 chunk_name = png_ptr->chunk_name;
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438 int iout = 0, ishift = 24;
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440 while (ishift >= 0)
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442 int c = (int)(chunk_name >> ishift) & 0xff;
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445 if (isnonalpha(c) != 0)
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447 buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET;
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448 buffer[iout++] = png_digit[(c & 0xf0) >> 4];
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449 buffer[iout++] = png_digit[c & 0x0f];
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450 buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET;
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455 buffer[iout++] = (char)c;
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459 if (error_message == NULL)
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460 buffer[iout] = '\0';
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466 buffer[iout++] = ':';
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467 buffer[iout++] = ' ';
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469 while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0')
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470 buffer[iout++] = error_message[iin++];
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472 /* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */
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473 buffer[iout] = '\0';
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476 #endif /* WARNINGS || ERROR_TEXT */
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478 #if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
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479 PNG_FUNCTION(void,PNGAPI
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480 png_chunk_error,(png_const_structrp png_ptr, png_const_charp error_message),
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483 char msg[18+PNG_MAX_ERROR_TEXT];
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484 if (png_ptr == NULL)
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485 png_error(png_ptr, error_message);
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489 png_format_buffer(png_ptr, msg, error_message);
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490 png_error(png_ptr, msg);
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493 #endif /* READ && ERROR_TEXT */
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495 #ifdef PNG_WARNINGS_SUPPORTED
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497 png_chunk_warning(png_const_structrp png_ptr, png_const_charp warning_message)
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499 char msg[18+PNG_MAX_ERROR_TEXT];
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500 if (png_ptr == NULL)
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501 png_warning(png_ptr, warning_message);
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505 png_format_buffer(png_ptr, msg, warning_message);
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506 png_warning(png_ptr, msg);
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509 #endif /* WARNINGS */
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511 #ifdef PNG_READ_SUPPORTED
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512 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
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514 png_chunk_benign_error(png_const_structrp png_ptr, png_const_charp
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517 if ((png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) != 0)
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518 png_chunk_warning(png_ptr, error_message);
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521 png_chunk_error(png_ptr, error_message);
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523 # ifndef PNG_ERROR_TEXT_SUPPORTED
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524 PNG_UNUSED(error_message)
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531 png_chunk_report(png_const_structrp png_ptr, png_const_charp message, int error)
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533 # ifndef PNG_WARNINGS_SUPPORTED
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534 PNG_UNUSED(message)
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537 /* This is always supported, but for just read or just write it
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538 * unconditionally does the right thing.
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540 # if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED)
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541 if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0)
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544 # ifdef PNG_READ_SUPPORTED
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546 if (error < PNG_CHUNK_ERROR)
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547 png_chunk_warning(png_ptr, message);
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550 png_chunk_benign_error(png_ptr, message);
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554 # if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED)
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555 else if ((png_ptr->mode & PNG_IS_READ_STRUCT) == 0)
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558 # ifdef PNG_WRITE_SUPPORTED
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560 if (error < PNG_CHUNK_WRITE_ERROR)
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561 png_app_warning(png_ptr, message);
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564 png_app_error(png_ptr, message);
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569 #ifdef PNG_ERROR_TEXT_SUPPORTED
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570 #ifdef PNG_FLOATING_POINT_SUPPORTED
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572 png_fixed_error,(png_const_structrp png_ptr, png_const_charp name),PNG_NORETURN)
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574 # define fixed_message "fixed point overflow in "
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575 # define fixed_message_ln ((sizeof fixed_message)-1)
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577 char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT];
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578 memcpy(msg, fixed_message, fixed_message_ln);
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581 while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0)
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583 msg[fixed_message_ln + iin] = name[iin];
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586 msg[fixed_message_ln + iin] = 0;
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587 png_error(png_ptr, msg);
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592 #ifdef PNG_SETJMP_SUPPORTED
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593 /* This API only exists if ANSI-C style error handling is used,
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594 * otherwise it is necessary for png_default_error to be overridden.
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597 png_set_longjmp_fn(png_structrp png_ptr, png_longjmp_ptr longjmp_fn,
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598 size_t jmp_buf_size)
\r
600 /* From libpng 1.6.0 the app gets one chance to set a 'jmpbuf_size' value
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601 * and it must not change after that. Libpng doesn't care how big the
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602 * buffer is, just that it doesn't change.
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604 * If the buffer size is no *larger* than the size of jmp_buf when libpng is
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605 * compiled a built in jmp_buf is returned; this preserves the pre-1.6.0
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606 * semantics that this call will not fail. If the size is larger, however,
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607 * the buffer is allocated and this may fail, causing the function to return
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610 if (png_ptr == NULL)
\r
613 if (png_ptr->jmp_buf_ptr == NULL)
\r
615 png_ptr->jmp_buf_size = 0; /* not allocated */
\r
617 if (jmp_buf_size <= (sizeof png_ptr->jmp_buf_local))
\r
618 png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local;
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622 png_ptr->jmp_buf_ptr = png_voidcast(jmp_buf *,
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623 png_malloc_warn(png_ptr, jmp_buf_size));
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625 if (png_ptr->jmp_buf_ptr == NULL)
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626 return NULL; /* new NULL return on OOM */
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628 png_ptr->jmp_buf_size = jmp_buf_size;
\r
632 else /* Already allocated: check the size */
\r
634 size_t size = png_ptr->jmp_buf_size;
\r
638 size = (sizeof png_ptr->jmp_buf_local);
\r
639 if (png_ptr->jmp_buf_ptr != &png_ptr->jmp_buf_local)
\r
641 /* This is an internal error in libpng: somehow we have been left
\r
642 * with a stack allocated jmp_buf when the application regained
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643 * control. It's always possible to fix this up, but for the moment
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644 * this is a png_error because that makes it easy to detect.
\r
646 png_error(png_ptr, "Libpng jmp_buf still allocated");
\r
647 /* png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; */
\r
651 if (size != jmp_buf_size)
\r
653 png_warning(png_ptr, "Application jmp_buf size changed");
\r
654 return NULL; /* caller will probably crash: no choice here */
\r
658 /* Finally fill in the function, now we have a satisfactory buffer. It is
\r
659 * valid to change the function on every call.
\r
661 png_ptr->longjmp_fn = longjmp_fn;
\r
662 return png_ptr->jmp_buf_ptr;
\r
666 png_free_jmpbuf(png_structrp png_ptr)
\r
668 if (png_ptr != NULL)
\r
670 jmp_buf *jb = png_ptr->jmp_buf_ptr;
\r
672 /* A size of 0 is used to indicate a local, stack, allocation of the
\r
673 * pointer; used here and in png.c
\r
675 if (jb != NULL && png_ptr->jmp_buf_size > 0)
\r
678 /* This stuff is so that a failure to free the error control structure
\r
679 * does not leave libpng in a state with no valid error handling: the
\r
680 * free always succeeds, if there is an error it gets ignored.
\r
682 if (jb != &png_ptr->jmp_buf_local)
\r
684 /* Make an internal, libpng, jmp_buf to return here */
\r
685 jmp_buf free_jmp_buf;
\r
687 if (!setjmp(free_jmp_buf))
\r
689 png_ptr->jmp_buf_ptr = &free_jmp_buf; /* come back here */
\r
690 png_ptr->jmp_buf_size = 0; /* stack allocation */
\r
691 png_ptr->longjmp_fn = longjmp;
\r
692 png_free(png_ptr, jb); /* Return to setjmp on error */
\r
697 /* *Always* cancel everything out: */
\r
698 png_ptr->jmp_buf_size = 0;
\r
699 png_ptr->jmp_buf_ptr = NULL;
\r
700 png_ptr->longjmp_fn = 0;
\r
705 /* This is the default error handling function. Note that replacements for
\r
706 * this function MUST NOT RETURN, or the program will likely crash. This
\r
707 * function is used by default, or if the program supplies NULL for the
\r
708 * error function pointer in png_set_error_fn().
\r
710 static PNG_FUNCTION(void /* PRIVATE */,
\r
711 png_default_error,(png_const_structrp png_ptr, png_const_charp error_message),
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714 #ifdef PNG_CONSOLE_IO_SUPPORTED
\r
715 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
\r
716 /* Check on NULL only added in 1.5.4 */
\r
717 if (error_message != NULL && *error_message == PNG_LITERAL_SHARP)
\r
719 /* Strip "#nnnn " from beginning of error message. */
\r
721 char error_number[16];
\r
722 for (offset = 0; offset<15; offset++)
\r
724 error_number[offset] = error_message[offset + 1];
\r
725 if (error_message[offset] == ' ')
\r
729 if ((offset > 1) && (offset < 15))
\r
731 error_number[offset - 1] = '\0';
\r
732 fprintf(stderr, "libpng error no. %s: %s",
\r
733 error_number, error_message + offset + 1);
\r
734 fprintf(stderr, PNG_STRING_NEWLINE);
\r
739 fprintf(stderr, "libpng error: %s, offset=%d",
\r
740 error_message, offset);
\r
741 fprintf(stderr, PNG_STRING_NEWLINE);
\r
747 fprintf(stderr, "libpng error: %s", error_message ? error_message :
\r
749 fprintf(stderr, PNG_STRING_NEWLINE);
\r
752 PNG_UNUSED(error_message) /* Make compiler happy */
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754 png_longjmp(png_ptr, 1);
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757 PNG_FUNCTION(void,PNGAPI
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758 png_longjmp,(png_const_structrp png_ptr, int val),PNG_NORETURN)
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760 #ifdef PNG_SETJMP_SUPPORTED
\r
761 if (png_ptr != NULL && png_ptr->longjmp_fn != NULL &&
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762 png_ptr->jmp_buf_ptr != NULL)
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763 png_ptr->longjmp_fn(*png_ptr->jmp_buf_ptr, val);
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765 PNG_UNUSED(png_ptr)
\r
769 /* If control reaches this point, png_longjmp() must not return. The only
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770 * choice is to terminate the whole process (or maybe the thread); to do
\r
771 * this the ANSI-C abort() function is used unless a different method is
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772 * implemented by overriding the default configuration setting for
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778 #ifdef PNG_WARNINGS_SUPPORTED
\r
779 /* This function is called when there is a warning, but the library thinks
\r
780 * it can continue anyway. Replacement functions don't have to do anything
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781 * here if you don't want them to. In the default configuration, png_ptr is
\r
782 * not used, but it is passed in case it may be useful.
\r
784 static void /* PRIVATE */
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785 png_default_warning(png_const_structrp png_ptr, png_const_charp warning_message)
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787 #ifdef PNG_CONSOLE_IO_SUPPORTED
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788 # ifdef PNG_ERROR_NUMBERS_SUPPORTED
\r
789 if (*warning_message == PNG_LITERAL_SHARP)
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792 char warning_number[16];
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793 for (offset = 0; offset < 15; offset++)
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795 warning_number[offset] = warning_message[offset + 1];
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796 if (warning_message[offset] == ' ')
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800 if ((offset > 1) && (offset < 15))
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802 warning_number[offset + 1] = '\0';
\r
803 fprintf(stderr, "libpng warning no. %s: %s",
\r
804 warning_number, warning_message + offset);
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805 fprintf(stderr, PNG_STRING_NEWLINE);
\r
810 fprintf(stderr, "libpng warning: %s",
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812 fprintf(stderr, PNG_STRING_NEWLINE);
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819 fprintf(stderr, "libpng warning: %s", warning_message);
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820 fprintf(stderr, PNG_STRING_NEWLINE);
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823 PNG_UNUSED(warning_message) /* Make compiler happy */
\r
825 PNG_UNUSED(png_ptr) /* Make compiler happy */
\r
827 #endif /* WARNINGS */
\r
829 /* This function is called when the application wants to use another method
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830 * of handling errors and warnings. Note that the error function MUST NOT
\r
831 * return to the calling routine or serious problems will occur. The return
\r
832 * method used in the default routine calls longjmp(png_ptr->jmp_buf_ptr, 1)
\r
835 png_set_error_fn(png_structrp png_ptr, png_voidp error_ptr,
\r
836 png_error_ptr error_fn, png_error_ptr warning_fn)
\r
838 if (png_ptr == NULL)
\r
841 png_ptr->error_ptr = error_ptr;
\r
842 png_ptr->error_fn = error_fn;
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843 #ifdef PNG_WARNINGS_SUPPORTED
\r
844 png_ptr->warning_fn = warning_fn;
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846 PNG_UNUSED(warning_fn)
\r
851 /* This function returns a pointer to the error_ptr associated with the user
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852 * functions. The application should free any memory associated with this
\r
853 * pointer before png_write_destroy and png_read_destroy are called.
\r
856 png_get_error_ptr(png_const_structrp png_ptr)
\r
858 if (png_ptr == NULL)
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861 return ((png_voidp)png_ptr->error_ptr);
\r
865 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
\r
867 png_set_strip_error_numbers(png_structrp png_ptr, png_uint_32 strip_mode)
\r
869 if (png_ptr != NULL)
\r
872 ((~(PNG_FLAG_STRIP_ERROR_NUMBERS |
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873 PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
\r
878 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
\r
879 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
\r
880 /* Currently the above both depend on SETJMP_SUPPORTED, however it would be
\r
881 * possible to implement without setjmp support just so long as there is some
\r
882 * way to handle the error return here:
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884 PNG_FUNCTION(void /* PRIVATE */, (PNGCBAPI
\r
885 png_safe_error),(png_structp png_nonconst_ptr, png_const_charp error_message),
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888 const png_const_structrp png_ptr = png_nonconst_ptr;
\r
889 png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr);
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891 /* An error is always logged here, overwriting anything (typically a warning)
\r
892 * that is already there:
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896 png_safecat(image->message, (sizeof image->message), 0, error_message);
\r
897 image->warning_or_error |= PNG_IMAGE_ERROR;
\r
899 /* Retrieve the jmp_buf from within the png_control, making this work for
\r
900 * C++ compilation too is pretty tricky: C++ wants a pointer to the first
\r
901 * element of a jmp_buf, but C doesn't tell us the type of that.
\r
903 if (image->opaque != NULL && image->opaque->error_buf != NULL)
\r
904 longjmp(png_control_jmp_buf(image->opaque), 1);
\r
906 /* Missing longjmp buffer, the following is to help debugging: */
\r
908 size_t pos = png_safecat(image->message, (sizeof image->message), 0,
\r
910 png_safecat(image->message, (sizeof image->message), pos,
\r
915 /* Here on an internal programming error. */
\r
919 #ifdef PNG_WARNINGS_SUPPORTED
\r
920 void /* PRIVATE */ PNGCBAPI
\r
921 png_safe_warning(png_structp png_nonconst_ptr, png_const_charp warning_message)
\r
923 const png_const_structrp png_ptr = png_nonconst_ptr;
\r
924 png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr);
\r
926 /* A warning is only logged if there is no prior warning or error. */
\r
927 if (image->warning_or_error == 0)
\r
929 png_safecat(image->message, (sizeof image->message), 0, warning_message);
\r
930 image->warning_or_error |= PNG_IMAGE_WARNING;
\r
936 png_safe_execute(png_imagep image_in, int (*function)(png_voidp), png_voidp arg)
\r
938 volatile png_imagep image = image_in;
\r
939 volatile int result;
\r
940 volatile png_voidp saved_error_buf;
\r
941 jmp_buf safe_jmpbuf;
\r
943 /* Safely execute function(arg) with png_error returning to this function. */
\r
944 saved_error_buf = image->opaque->error_buf;
\r
945 result = setjmp(safe_jmpbuf) == 0;
\r
950 image->opaque->error_buf = safe_jmpbuf;
\r
951 result = function(arg);
\r
954 image->opaque->error_buf = saved_error_buf;
\r
956 /* And do the cleanup prior to any failure return. */
\r
958 png_image_free(image);
\r
962 #endif /* SIMPLIFIED READ || SIMPLIFIED_WRITE */
\r
963 #endif /* READ || WRITE */
\r