diff options
Diffstat (limited to 'third_party/lpng_v163/pngerror.c')
| -rw-r--r-- | third_party/lpng_v163/pngerror.c | 931 |
1 files changed, 0 insertions, 931 deletions
diff --git a/third_party/lpng_v163/pngerror.c b/third_party/lpng_v163/pngerror.c deleted file mode 100644 index 2125e4ca11..0000000000 --- a/third_party/lpng_v163/pngerror.c +++ /dev/null @@ -1,931 +0,0 @@ -/* pngerror.c - stub functions for i/o and memory allocation
- *
- * Last changed in libpng 1.6.1 [March 28, 2013]
- * Copyright (c) 1998-2013 Glenn Randers-Pehrson
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- *
- * This file provides a location for all error handling. Users who
- * need special error handling are expected to write replacement functions
- * and use png_set_error_fn() to use those functions. See the instructions
- * at each function.
- */
-
-#include "pngpriv.h"
-
-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-
-static PNG_FUNCTION(void, png_default_error,PNGARG((png_const_structrp png_ptr,
- png_const_charp error_message)),PNG_NORETURN);
-
-#ifdef PNG_WARNINGS_SUPPORTED
-static void /* PRIVATE */
-png_default_warning PNGARG((png_const_structrp png_ptr,
- png_const_charp warning_message));
-#endif /* PNG_WARNINGS_SUPPORTED */
-
-/* This function is called whenever there is a fatal error. This function
- * should not be changed. If there is a need to handle errors differently,
- * you should supply a replacement error function and use png_set_error_fn()
- * to replace the error function at run-time.
- */
-#ifdef PNG_ERROR_TEXT_SUPPORTED
-PNG_FUNCTION(void,PNGAPI
-png_error,(png_const_structrp png_ptr, png_const_charp error_message),
- PNG_NORETURN)
-{
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
- char msg[16];
- if (png_ptr != NULL)
- {
- if (png_ptr->flags&
- (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
- {
- if (*error_message == PNG_LITERAL_SHARP)
- {
- /* Strip "#nnnn " from beginning of error message. */
- int offset;
- for (offset = 1; offset<15; offset++)
- if (error_message[offset] == ' ')
- break;
-
- if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
- {
- int i;
- for (i = 0; i < offset - 1; i++)
- msg[i] = error_message[i + 1];
- msg[i - 1] = '\0';
- error_message = msg;
- }
-
- else
- error_message += offset;
- }
-
- else
- {
- if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
- {
- msg[0] = '0';
- msg[1] = '\0';
- error_message = msg;
- }
- }
- }
- }
-#endif
- if (png_ptr != NULL && png_ptr->error_fn != NULL)
- (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr),
- error_message);
-
- /* If the custom handler doesn't exist, or if it returns,
- use the default handler, which will not return. */
- png_default_error(png_ptr, error_message);
-}
-#else
-PNG_FUNCTION(void,PNGAPI
-png_err,(png_const_structrp png_ptr),PNG_NORETURN)
-{
- /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed
- * erroneously as '\0', instead of the empty string "". This was
- * apparently an error, introduced in libpng-1.2.20, and png_default_error
- * will crash in this case.
- */
- if (png_ptr != NULL && png_ptr->error_fn != NULL)
- (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), "");
-
- /* If the custom handler doesn't exist, or if it returns,
- use the default handler, which will not return. */
- png_default_error(png_ptr, "");
-}
-#endif /* PNG_ERROR_TEXT_SUPPORTED */
-
-/* Utility to safely appends strings to a buffer. This never errors out so
- * error checking is not required in the caller.
- */
-size_t
-png_safecat(png_charp buffer, size_t bufsize, size_t pos,
- png_const_charp string)
-{
- if (buffer != NULL && pos < bufsize)
- {
- if (string != NULL)
- while (*string != '\0' && pos < bufsize-1)
- buffer[pos++] = *string++;
-
- buffer[pos] = '\0';
- }
-
- return pos;
-}
-
-#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
-/* Utility to dump an unsigned value into a buffer, given a start pointer and
- * and end pointer (which should point just *beyond* the end of the buffer!)
- * Returns the pointer to the start of the formatted string.
- */
-png_charp
-png_format_number(png_const_charp start, png_charp end, int format,
- png_alloc_size_t number)
-{
- int count = 0; /* number of digits output */
- int mincount = 1; /* minimum number required */
- int output = 0; /* digit output (for the fixed point format) */
-
- *--end = '\0';
-
- /* This is written so that the loop always runs at least once, even with
- * number zero.
- */
- while (end > start && (number != 0 || count < mincount))
- {
-
- static const char digits[] = "0123456789ABCDEF";
-
- switch (format)
- {
- case PNG_NUMBER_FORMAT_fixed:
- /* Needs five digits (the fraction) */
- mincount = 5;
- if (output || number % 10 != 0)
- {
- *--end = digits[number % 10];
- output = 1;
- }
- number /= 10;
- break;
-
- case PNG_NUMBER_FORMAT_02u:
- /* Expects at least 2 digits. */
- mincount = 2;
- /* FALL THROUGH */
-
- case PNG_NUMBER_FORMAT_u:
- *--end = digits[number % 10];
- number /= 10;
- break;
-
- case PNG_NUMBER_FORMAT_02x:
- /* This format expects at least two digits */
- mincount = 2;
- /* FALL THROUGH */
-
- case PNG_NUMBER_FORMAT_x:
- *--end = digits[number & 0xf];
- number >>= 4;
- break;
-
- default: /* an error */
- number = 0;
- break;
- }
-
- /* Keep track of the number of digits added */
- ++count;
-
- /* Float a fixed number here: */
- if (format == PNG_NUMBER_FORMAT_fixed) if (count == 5) if (end > start)
- {
- /* End of the fraction, but maybe nothing was output? In that case
- * drop the decimal point. If the number is a true zero handle that
- * here.
- */
- if (output)
- *--end = '.';
- else if (number == 0) /* and !output */
- *--end = '0';
- }
- }
-
- return end;
-}
-#endif
-
-#ifdef PNG_WARNINGS_SUPPORTED
-/* This function is called whenever there is a non-fatal error. This function
- * should not be changed. If there is a need to handle warnings differently,
- * you should supply a replacement warning function and use
- * png_set_error_fn() to replace the warning function at run-time.
- */
-void PNGAPI
-png_warning(png_const_structrp png_ptr, png_const_charp warning_message)
-{
- int offset = 0;
- if (png_ptr != NULL)
- {
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
- if (png_ptr->flags&
- (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
-#endif
- {
- if (*warning_message == PNG_LITERAL_SHARP)
- {
- for (offset = 1; offset < 15; offset++)
- if (warning_message[offset] == ' ')
- break;
- }
- }
- }
- if (png_ptr != NULL && png_ptr->warning_fn != NULL)
- (*(png_ptr->warning_fn))(png_constcast(png_structrp,png_ptr),
- warning_message + offset);
- else
- png_default_warning(png_ptr, warning_message + offset);
-}
-
-/* These functions support 'formatted' warning messages with up to
- * PNG_WARNING_PARAMETER_COUNT parameters. In the format string the parameter
- * is introduced by @<number>, where 'number' starts at 1. This follows the
- * standard established by X/Open for internationalizable error messages.
- */
-void
-png_warning_parameter(png_warning_parameters p, int number,
- png_const_charp string)
-{
- if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT)
- (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string);
-}
-
-void
-png_warning_parameter_unsigned(png_warning_parameters p, int number, int format,
- png_alloc_size_t value)
-{
- char buffer[PNG_NUMBER_BUFFER_SIZE];
- png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value));
-}
-
-void
-png_warning_parameter_signed(png_warning_parameters p, int number, int format,
- png_int_32 value)
-{
- png_alloc_size_t u;
- png_charp str;
- char buffer[PNG_NUMBER_BUFFER_SIZE];
-
- /* Avoid overflow by doing the negate in a png_alloc_size_t: */
- u = (png_alloc_size_t)value;
- if (value < 0)
- u = ~u + 1;
-
- str = PNG_FORMAT_NUMBER(buffer, format, u);
-
- if (value < 0 && str > buffer)
- *--str = '-';
-
- png_warning_parameter(p, number, str);
-}
-
-void
-png_formatted_warning(png_const_structrp png_ptr, png_warning_parameters p,
- png_const_charp message)
-{
- /* The internal buffer is just 192 bytes - enough for all our messages,
- * overflow doesn't happen because this code checks! If someone figures
- * out how to send us a message longer than 192 bytes, all that will
- * happen is that the message will be truncated appropriately.
- */
- size_t i = 0; /* Index in the msg[] buffer: */
- char msg[192];
-
- /* Each iteration through the following loop writes at most one character
- * to msg[i++] then returns here to validate that there is still space for
- * the trailing '\0'. It may (in the case of a parameter) read more than
- * one character from message[]; it must check for '\0' and continue to the
- * test if it finds the end of string.
- */
- while (i<(sizeof msg)-1 && *message != '\0')
- {
- /* '@' at end of string is now just printed (previously it was skipped);
- * it is an error in the calling code to terminate the string with @.
- */
- if (p != NULL && *message == '@' && message[1] != '\0')
- {
- int parameter_char = *++message; /* Consume the '@' */
- static const char valid_parameters[] = "123456789";
- int parameter = 0;
-
- /* Search for the parameter digit, the index in the string is the
- * parameter to use.
- */
- while (valid_parameters[parameter] != parameter_char &&
- valid_parameters[parameter] != '\0')
- ++parameter;
-
- /* If the parameter digit is out of range it will just get printed. */
- if (parameter < PNG_WARNING_PARAMETER_COUNT)
- {
- /* Append this parameter */
- png_const_charp parm = p[parameter];
- png_const_charp pend = p[parameter] + (sizeof p[parameter]);
-
- /* No need to copy the trailing '\0' here, but there is no guarantee
- * that parm[] has been initialized, so there is no guarantee of a
- * trailing '\0':
- */
- while (i<(sizeof msg)-1 && *parm != '\0' && parm < pend)
- msg[i++] = *parm++;
-
- /* Consume the parameter digit too: */
- ++message;
- continue;
- }
-
- /* else not a parameter and there is a character after the @ sign; just
- * copy that. This is known not to be '\0' because of the test above.
- */
- }
-
- /* At this point *message can't be '\0', even in the bad parameter case
- * above where there is a lone '@' at the end of the message string.
- */
- msg[i++] = *message++;
- }
-
- /* i is always less than (sizeof msg), so: */
- msg[i] = '\0';
-
- /* And this is the formatted message. It may be larger than
- * PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these
- * are not (currently) formatted.
- */
- png_warning(png_ptr, msg);
-}
-#endif /* PNG_WARNINGS_SUPPORTED */
-
-#ifdef PNG_BENIGN_ERRORS_SUPPORTED
-void PNGAPI
-png_benign_error(png_const_structrp png_ptr, png_const_charp error_message)
-{
- if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN)
- {
-# ifdef PNG_READ_SUPPORTED
- if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
- png_ptr->chunk_name != 0)
- png_chunk_warning(png_ptr, error_message);
- else
-# endif
- png_warning(png_ptr, error_message);
- }
-
- else
- {
-# ifdef PNG_READ_SUPPORTED
- if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&
- png_ptr->chunk_name != 0)
- png_chunk_error(png_ptr, error_message);
- else
-# endif
- png_error(png_ptr, error_message);
- }
-}
-
-void /* PRIVATE */
-png_app_warning(png_const_structrp png_ptr, png_const_charp error_message)
-{
- if (png_ptr->flags & PNG_FLAG_APP_WARNINGS_WARN)
- png_warning(png_ptr, error_message);
- else
- png_error(png_ptr, error_message);
-}
-
-void /* PRIVATE */
-png_app_error(png_const_structrp png_ptr, png_const_charp error_message)
-{
- if (png_ptr->flags & PNG_FLAG_APP_ERRORS_WARN)
- png_warning(png_ptr, error_message);
- else
- png_error(png_ptr, error_message);
-}
-#endif /* BENIGN_ERRORS */
-
-/* These utilities are used internally to build an error message that relates
- * to the current chunk. The chunk name comes from png_ptr->chunk_name,
- * this is used to prefix the message. The message is limited in length
- * to 63 bytes, the name characters are output as hex digits wrapped in []
- * if the character is invalid.
- */
-#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
-static PNG_CONST char png_digit[16] = {
- '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
- 'A', 'B', 'C', 'D', 'E', 'F'
-};
-
-#define PNG_MAX_ERROR_TEXT 196 /* Currently limited be profile_error in png.c */
-#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED)
-static void /* PRIVATE */
-png_format_buffer(png_const_structrp png_ptr, png_charp buffer, png_const_charp
- error_message)
-{
- png_uint_32 chunk_name = png_ptr->chunk_name;
- int iout = 0, ishift = 24;
-
- while (ishift >= 0)
- {
- int c = (int)(chunk_name >> ishift) & 0xff;
-
- ishift -= 8;
- if (isnonalpha(c))
- {
- buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET;
- buffer[iout++] = png_digit[(c & 0xf0) >> 4];
- buffer[iout++] = png_digit[c & 0x0f];
- buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET;
- }
-
- else
- {
- buffer[iout++] = (char)c;
- }
- }
-
- if (error_message == NULL)
- buffer[iout] = '\0';
-
- else
- {
- int iin = 0;
-
- buffer[iout++] = ':';
- buffer[iout++] = ' ';
-
- while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0')
- buffer[iout++] = error_message[iin++];
-
- /* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */
- buffer[iout] = '\0';
- }
-}
-#endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */
-
-#if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
-PNG_FUNCTION(void,PNGAPI
-png_chunk_error,(png_const_structrp png_ptr, png_const_charp error_message),
- PNG_NORETURN)
-{
- char msg[18+PNG_MAX_ERROR_TEXT];
- if (png_ptr == NULL)
- png_error(png_ptr, error_message);
-
- else
- {
- png_format_buffer(png_ptr, msg, error_message);
- png_error(png_ptr, msg);
- }
-}
-#endif /* PNG_READ_SUPPORTED && PNG_ERROR_TEXT_SUPPORTED */
-
-#ifdef PNG_WARNINGS_SUPPORTED
-void PNGAPI
-png_chunk_warning(png_const_structrp png_ptr, png_const_charp warning_message)
-{
- char msg[18+PNG_MAX_ERROR_TEXT];
- if (png_ptr == NULL)
- png_warning(png_ptr, warning_message);
-
- else
- {
- png_format_buffer(png_ptr, msg, warning_message);
- png_warning(png_ptr, msg);
- }
-}
-#endif /* PNG_WARNINGS_SUPPORTED */
-
-#ifdef PNG_READ_SUPPORTED
-#ifdef PNG_BENIGN_ERRORS_SUPPORTED
-void PNGAPI
-png_chunk_benign_error(png_const_structrp png_ptr, png_const_charp
- error_message)
-{
- if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN)
- png_chunk_warning(png_ptr, error_message);
-
- else
- png_chunk_error(png_ptr, error_message);
-}
-#endif
-#endif /* PNG_READ_SUPPORTED */
-
-void /* PRIVATE */
-png_chunk_report(png_const_structrp png_ptr, png_const_charp message, int error)
-{
- /* This is always supported, but for just read or just write it
- * unconditionally does the right thing.
- */
-# if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED)
- if (png_ptr->mode & PNG_IS_READ_STRUCT)
-# endif
-
-# ifdef PNG_READ_SUPPORTED
- {
- if (error < PNG_CHUNK_ERROR)
- png_chunk_warning(png_ptr, message);
-
- else
- png_chunk_benign_error(png_ptr, message);
- }
-# endif
-
-# if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED)
- else if (!(png_ptr->mode & PNG_IS_READ_STRUCT))
-# endif
-
-# ifdef PNG_WRITE_SUPPORTED
- {
- if (error < PNG_CHUNK_WRITE_ERROR)
- png_app_warning(png_ptr, message);
-
- else
- png_app_error(png_ptr, message);
- }
-# endif
-}
-
-#ifdef PNG_ERROR_TEXT_SUPPORTED
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-PNG_FUNCTION(void,
-png_fixed_error,(png_const_structrp png_ptr, png_const_charp name),PNG_NORETURN)
-{
-# define fixed_message "fixed point overflow in "
-# define fixed_message_ln ((sizeof fixed_message)-1)
- int iin;
- char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT];
- memcpy(msg, fixed_message, fixed_message_ln);
- iin = 0;
- if (name != NULL) while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0)
- {
- msg[fixed_message_ln + iin] = name[iin];
- ++iin;
- }
- msg[fixed_message_ln + iin] = 0;
- png_error(png_ptr, msg);
-}
-#endif
-#endif
-
-#ifdef PNG_SETJMP_SUPPORTED
-/* This API only exists if ANSI-C style error handling is used,
- * otherwise it is necessary for png_default_error to be overridden.
- */
-jmp_buf* PNGAPI
-png_set_longjmp_fn(png_structrp png_ptr, png_longjmp_ptr longjmp_fn,
- size_t jmp_buf_size)
-{
- /* From libpng 1.6.0 the app gets one chance to set a 'jmpbuf_size' value
- * and it must not change after that. Libpng doesn't care how big the
- * buffer is, just that it doesn't change.
- *
- * If the buffer size is no *larger* than the size of jmp_buf when libpng is
- * compiled a built in jmp_buf is returned; this preserves the pre-1.6.0
- * semantics that this call will not fail. If the size is larger, however,
- * the buffer is allocated and this may fail, causing the function to return
- * NULL.
- */
- if (png_ptr == NULL)
- return NULL;
-
- if (png_ptr->jmp_buf_ptr == NULL)
- {
- png_ptr->jmp_buf_size = 0; /* not allocated */
-
- if (jmp_buf_size <= (sizeof png_ptr->jmp_buf_local))
- png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local;
-
- else
- {
- png_ptr->jmp_buf_ptr = png_voidcast(jmp_buf *,
- png_malloc_warn(png_ptr, jmp_buf_size));
-
- if (png_ptr->jmp_buf_ptr == NULL)
- return NULL; /* new NULL return on OOM */
-
- png_ptr->jmp_buf_size = jmp_buf_size;
- }
- }
-
- else /* Already allocated: check the size */
- {
- size_t size = png_ptr->jmp_buf_size;
-
- if (size == 0)
- {
- size = (sizeof png_ptr->jmp_buf_local);
- if (png_ptr->jmp_buf_ptr != &png_ptr->jmp_buf_local)
- {
- /* This is an internal error in libpng: somehow we have been left
- * with a stack allocated jmp_buf when the application regained
- * control. It's always possible to fix this up, but for the moment
- * this is a png_error because that makes it easy to detect.
- */
- png_error(png_ptr, "Libpng jmp_buf still allocated");
- /* png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; */
- }
- }
-
- if (size != jmp_buf_size)
- {
- png_warning(png_ptr, "Application jmp_buf size changed");
- return NULL; /* caller will probably crash: no choice here */
- }
- }
-
- /* Finally fill in the function, now we have a satisfactory buffer. It is
- * valid to change the function on every call.
- */
- png_ptr->longjmp_fn = longjmp_fn;
- return png_ptr->jmp_buf_ptr;
-}
-
-void /* PRIVATE */
-png_free_jmpbuf(png_structrp png_ptr)
-{
- if (png_ptr != NULL)
- {
- jmp_buf *jb = png_ptr->jmp_buf_ptr;
-
- /* A size of 0 is used to indicate a local, stack, allocation of the
- * pointer; used here and in png.c
- */
- if (jb != NULL && png_ptr->jmp_buf_size > 0)
- {
-
- /* This stuff is so that a failure to free the error control structure
- * does not leave libpng in a state with no valid error handling: the
- * free always succeeds, if there is an error it gets ignored.
- */
- if (jb != &png_ptr->jmp_buf_local)
- {
- /* Make an internal, libpng, jmp_buf to return here */
- jmp_buf free_jmp_buf;
-
- if (!setjmp(free_jmp_buf))
- {
- png_ptr->jmp_buf_ptr = &free_jmp_buf; /* come back here */
- png_ptr->jmp_buf_size = 0; /* stack allocation */
- png_ptr->longjmp_fn = longjmp;
- png_free(png_ptr, jb); /* Return to setjmp on error */
- }
- }
- }
-
- /* *Always* cancel everything out: */
- png_ptr->jmp_buf_size = 0;
- png_ptr->jmp_buf_ptr = NULL;
- png_ptr->longjmp_fn = 0;
- }
-}
-#endif
-
-/* This is the default error handling function. Note that replacements for
- * this function MUST NOT RETURN, or the program will likely crash. This
- * function is used by default, or if the program supplies NULL for the
- * error function pointer in png_set_error_fn().
- */
-static PNG_FUNCTION(void /* PRIVATE */,
-png_default_error,(png_const_structrp png_ptr, png_const_charp error_message),
- PNG_NORETURN)
-{
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
- /* Check on NULL only added in 1.5.4 */
- if (error_message != NULL && *error_message == PNG_LITERAL_SHARP)
- {
- /* Strip "#nnnn " from beginning of error message. */
- int offset;
- char error_number[16];
- for (offset = 0; offset<15; offset++)
- {
- error_number[offset] = error_message[offset + 1];
- if (error_message[offset] == ' ')
- break;
- }
-
- if ((offset > 1) && (offset < 15))
- {
- error_number[offset - 1] = '\0';
- fprintf(stderr, "libpng error no. %s: %s",
- error_number, error_message + offset + 1);
- fprintf(stderr, PNG_STRING_NEWLINE);
- }
-
- else
- {
- fprintf(stderr, "libpng error: %s, offset=%d",
- error_message, offset);
- fprintf(stderr, PNG_STRING_NEWLINE);
- }
- }
- else
-#endif
- {
- fprintf(stderr, "libpng error: %s", error_message ? error_message :
- "undefined");
- fprintf(stderr, PNG_STRING_NEWLINE);
- }
-#else
- PNG_UNUSED(error_message) /* Make compiler happy */
-#endif
- png_longjmp(png_ptr, 1);
-}
-
-PNG_FUNCTION(void,PNGAPI
-png_longjmp,(png_const_structrp png_ptr, int val),PNG_NORETURN)
-{
-#ifdef PNG_SETJMP_SUPPORTED
- if (png_ptr && png_ptr->longjmp_fn && png_ptr->jmp_buf_ptr)
- png_ptr->longjmp_fn(*png_ptr->jmp_buf_ptr, val);
-#endif
-
- /* Here if not setjmp support or if png_ptr is null. */
- PNG_ABORT();
-}
-
-#ifdef PNG_WARNINGS_SUPPORTED
-/* This function is called when there is a warning, but the library thinks
- * it can continue anyway. Replacement functions don't have to do anything
- * here if you don't want them to. In the default configuration, png_ptr is
- * not used, but it is passed in case it may be useful.
- */
-static void /* PRIVATE */
-png_default_warning(png_const_structrp png_ptr, png_const_charp warning_message)
-{
-#ifdef PNG_CONSOLE_IO_SUPPORTED
-# ifdef PNG_ERROR_NUMBERS_SUPPORTED
- if (*warning_message == PNG_LITERAL_SHARP)
- {
- int offset;
- char warning_number[16];
- for (offset = 0; offset < 15; offset++)
- {
- warning_number[offset] = warning_message[offset + 1];
- if (warning_message[offset] == ' ')
- break;
- }
-
- if ((offset > 1) && (offset < 15))
- {
- warning_number[offset + 1] = '\0';
- fprintf(stderr, "libpng warning no. %s: %s",
- warning_number, warning_message + offset);
- fprintf(stderr, PNG_STRING_NEWLINE);
- }
-
- else
- {
- fprintf(stderr, "libpng warning: %s",
- warning_message);
- fprintf(stderr, PNG_STRING_NEWLINE);
- }
- }
- else
-# endif
-
- {
- fprintf(stderr, "libpng warning: %s", warning_message);
- fprintf(stderr, PNG_STRING_NEWLINE);
- }
-#else
- PNG_UNUSED(warning_message) /* Make compiler happy */
-#endif
- PNG_UNUSED(png_ptr) /* Make compiler happy */
-}
-#endif /* PNG_WARNINGS_SUPPORTED */
-
-/* This function is called when the application wants to use another method
- * of handling errors and warnings. Note that the error function MUST NOT
- * return to the calling routine or serious problems will occur. The return
- * method used in the default routine calls longjmp(png_ptr->jmp_buf_ptr, 1)
- */
-void PNGAPI
-png_set_error_fn(png_structrp png_ptr, png_voidp error_ptr,
- png_error_ptr error_fn, png_error_ptr warning_fn)
-{
- if (png_ptr == NULL)
- return;
-
- png_ptr->error_ptr = error_ptr;
- png_ptr->error_fn = error_fn;
-#ifdef PNG_WARNINGS_SUPPORTED
- png_ptr->warning_fn = warning_fn;
-#else
- PNG_UNUSED(warning_fn)
-#endif
-}
-
-
-/* This function returns a pointer to the error_ptr associated with the user
- * functions. The application should free any memory associated with this
- * pointer before png_write_destroy and png_read_destroy are called.
- */
-png_voidp PNGAPI
-png_get_error_ptr(png_const_structrp png_ptr)
-{
- if (png_ptr == NULL)
- return NULL;
-
- return ((png_voidp)png_ptr->error_ptr);
-}
-
-
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-void PNGAPI
-png_set_strip_error_numbers(png_structrp png_ptr, png_uint_32 strip_mode)
-{
- if (png_ptr != NULL)
- {
- png_ptr->flags &=
- ((~(PNG_FLAG_STRIP_ERROR_NUMBERS |
- PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
- }
-}
-#endif
-
-#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
- defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
- /* Currently the above both depend on SETJMP_SUPPORTED, however it would be
- * possible to implement without setjmp support just so long as there is some
- * way to handle the error return here:
- */
-PNG_FUNCTION(void /* PRIVATE */,
-png_safe_error,(png_structp png_nonconst_ptr, png_const_charp error_message),
- PNG_NORETURN)
-{
- const png_const_structrp png_ptr = png_nonconst_ptr;
- png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr);
-
- /* An error is always logged here, overwriting anything (typically a warning)
- * that is already there:
- */
- if (image != NULL)
- {
- png_safecat(image->message, (sizeof image->message), 0, error_message);
- image->warning_or_error |= PNG_IMAGE_ERROR;
-
- /* Retrieve the jmp_buf from within the png_control, making this work for
- * C++ compilation too is pretty tricky: C++ wants a pointer to the first
- * element of a jmp_buf, but C doesn't tell us the type of that.
- */
- if (image->opaque != NULL && image->opaque->error_buf != NULL)
- longjmp(png_control_jmp_buf(image->opaque), 1);
-
- /* Missing longjmp buffer, the following is to help debugging: */
- {
- size_t pos = png_safecat(image->message, (sizeof image->message), 0,
- "bad longjmp: ");
- png_safecat(image->message, (sizeof image->message), pos,
- error_message);
- }
- }
-
- /* Here on an internal programming error. */
- abort();
-}
-
-#ifdef PNG_WARNINGS_SUPPORTED
-void /* PRIVATE */
-png_safe_warning(png_structp png_nonconst_ptr, png_const_charp warning_message)
-{
- const png_const_structrp png_ptr = png_nonconst_ptr;
- png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr);
-
- /* A warning is only logged if there is no prior warning or error. */
- if (image->warning_or_error == 0)
- {
- png_safecat(image->message, (sizeof image->message), 0, warning_message);
- image->warning_or_error |= PNG_IMAGE_WARNING;
- }
-}
-#endif
-
-int /* PRIVATE */
-png_safe_execute(png_imagep image_in, int (*function)(png_voidp), png_voidp arg)
-{
- volatile png_imagep image = image_in;
- volatile int result;
- volatile png_voidp saved_error_buf;
- jmp_buf safe_jmpbuf;
-
- /* Safely execute function(arg) with png_error returning to this function. */
- saved_error_buf = image->opaque->error_buf;
- result = setjmp(safe_jmpbuf) == 0;
-
- if (result)
- {
-
- image->opaque->error_buf = safe_jmpbuf;
- result = function(arg);
- }
-
- image->opaque->error_buf = saved_error_buf;
-
- /* And do the cleanup prior to any failure return. */
- if (!result)
- png_image_free(image);
-
- return result;
-}
-#endif /* SIMPLIFIED READ/WRITE */
-#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
|