/* pngerror.c - stub functions for i/o and memory allocation
*
- * libpng version 1.2.6 - August 15, 2004
+ * Last changed in libpng 1.2.20 September 8, 2007
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2007 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.)
*
#define PNG_INTERNAL
#include "png.h"
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
static void /* PRIVATE */
png_default_error PNGARG((png_structp png_ptr,
png_const_charp error_message));
+#ifndef PNG_NO_WARNINGS
static void /* PRIVATE */
png_default_warning PNGARG((png_structp png_ptr,
png_const_charp warning_message));
+#endif /* PNG_NO_WARNINGS */
/* 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.
*/
+#ifndef PNG_NO_ERROR_TEXT
void PNGAPI
png_error(png_structp png_ptr, png_const_charp error_message)
{
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
char msg[16];
- if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+ if (png_ptr != NULL)
{
- if (*error_message == '#')
+ if (png_ptr->flags&
+ (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
{
- 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]='\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;
- }
+ if (*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]='\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
use the default handler, which will not return. */
png_default_error(png_ptr, error_message);
}
+#else
+void PNGAPI
+png_err(png_structp png_ptr)
+{
+ if (png_ptr != NULL && png_ptr->error_fn != NULL)
+ (*(png_ptr->error_fn))(png_ptr, '\0');
+ /* If the custom handler doesn't exist, or if it returns,
+ use the default handler, which will not return. */
+ png_default_error(png_ptr, '\0');
+}
+#endif /* PNG_NO_ERROR_TEXT */
+
+#ifndef PNG_NO_WARNINGS
/* 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_warning(png_structp 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))
+ if (png_ptr->flags&
+ (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
#endif
- {
- if (*warning_message == '#')
{
- for (offset=1; offset<15; offset++)
- if (*(warning_message+offset) == ' ')
- break;
+ if (*warning_message == '#')
+ {
+ 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_ptr, warning_message+offset);
}
- if (png_ptr != NULL && png_ptr->warning_fn != NULL)
- (*(png_ptr->warning_fn))(png_ptr, warning_message+offset);
else
png_default_warning(png_ptr, warning_message+offset);
}
+#endif /* PNG_NO_WARNINGS */
+
/* 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,
'A', 'B', 'C', 'D', 'E', 'F'
};
+#if !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT)
static void /* PRIVATE */
png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
error_message)
while (iin < 4)
{
- int c = png_ptr->chunk_name[iin++];
+ int c = png_ptr->chunk_name[iin++];
if (isnonalpha(c))
{
buffer[iout++] = '[';
}
}
+#ifdef PNG_READ_SUPPORTED
void PNGAPI
png_chunk_error(png_structp png_ptr, png_const_charp error_message)
{
char msg[18+64];
- png_format_buffer(png_ptr, msg, error_message);
- png_error(png_ptr, msg);
+ 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 */
+#endif /* !defined(PNG_NO_WARNINGS) || !defined(PNG_NO_ERROR_TEXT) */
+#ifndef PNG_NO_WARNINGS
void PNGAPI
png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
{
char msg[18+64];
- png_format_buffer(png_ptr, msg, warning_message);
- png_warning(png_ptr, msg);
+ 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_NO_WARNINGS */
+
/* This is the default error handling function. Note that replacements for
* this function MUST NOT RETURN, or the program will likely crash. This
#endif
#ifdef PNG_SETJMP_SUPPORTED
+ if (png_ptr)
+ {
# ifdef USE_FAR_KEYWORD
{
jmp_buf jmpbuf;
- png_memcpy(jmpbuf,png_ptr->jmpbuf,png_sizeof(jmp_buf));
+ png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
longjmp(jmpbuf, 1);
}
# else
longjmp(png_ptr->jmpbuf, 1);
-# endif
+# endif
+ }
#else
- /* make compiler happy */ ;
- if (png_ptr)
PNG_ABORT();
#endif
#ifdef PNG_NO_CONSOLE_IO
- /* make compiler happy */ ;
- if (&error_message != NULL)
- return;
+ error_message = error_message; /* make compiler happy */
#endif
}
+#ifndef PNG_NO_WARNINGS
/* 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
# endif
fprintf(stderr, "libpng warning: %s\n", warning_message);
#else
- /* make compiler happy */ ;
- if (warning_message)
- return;
+ warning_message = warning_message; /* make compiler happy */
#endif
- /* make compiler happy */ ;
- if (png_ptr)
- return;
+ png_ptr = png_ptr; /* make compiler happy */
}
+#endif /* PNG_NO_WARNINGS */
/* This function is called when the application wants to use another method
* of handling errors and warnings. Note that the error function MUST NOT
png_set_error_fn(png_structp 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;
png_ptr->warning_fn = warning_fn;
png_voidp PNGAPI
png_get_error_ptr(png_structp png_ptr)
{
+ if (png_ptr == NULL)
+ return NULL;
return ((png_voidp)png_ptr->error_ptr);
}
}
}
#endif
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
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