/* pngerror.c - stub functions for i/o and memory allocation
*
- * libpng 1.2.5rc3 - September 18, 2002
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * Last changed in libpng 1.4.0 [January 3, 2010]
+ * Copyright (c) 1998-2010 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.
*/
-#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
#include "png.h"
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+#include "pngpriv.h"
static void /* PRIVATE */
png_default_error PNGARG((png_structp png_ptr,
- png_const_charp error_message));
+ png_const_charp error_message)) PNG_NORETURN;
+#ifdef PNG_WARNINGS_SUPPORTED
static void /* PRIVATE */
png_default_warning PNGARG((png_structp 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
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)
{
- int offset = 0;
- if (*error_message == '#')
- {
- 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_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
{
- if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
- {
- msg[0]='0';
- msg[1]='\0';
- error_message=msg;
- }
+ 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->error_fn != NULL)
+ if (png_ptr != NULL && png_ptr->error_fn != NULL)
(*(png_ptr->error_fn))(png_ptr, error_message);
- /* if the following returns or doesn't exist, use the default function,
- which will not return */
+ /* 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
+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_ERROR_TEXT_SUPPORTED */
+
+#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
void PNGAPI
png_warning(png_structp png_ptr, png_const_charp warning_message)
{
- int offset = 0;
+ 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 == PNG_LITERAL_SHARP)
+ {
+ for (offset = 1; offset < 15; offset++)
+ if (warning_message[offset] == ' ')
+ break;
+ }
}
}
- if (png_ptr->warning_fn != NULL)
- (*(png_ptr->warning_fn))(png_ptr,
- (png_const_charp)(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, (png_const_charp)(warning_message+offset));
+ png_default_warning(png_ptr, warning_message + offset);
}
+#endif /* PNG_WARNINGS_SUPPORTED */
+
+#ifdef PNG_BENIGN_ERRORS_SUPPORTED
+void PNGAPI
+png_benign_error(png_structp png_ptr, png_const_charp error_message)
+{
+ if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN)
+ png_warning(png_ptr, error_message);
+ else
+ png_error(png_ptr, error_message);
+}
+#endif
/* 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,
* to 63 bytes, the name characters are output as hex digits wrapped in []
* if the character is invalid.
*/
-#define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97))
+#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' };
+ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+ 'A', 'B', 'C', 'D', 'E', 'F'
+};
+#define PNG_MAX_ERROR_TEXT 64
+#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED)
static void /* PRIVATE */
png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
error_message)
int c = png_ptr->chunk_name[iin++];
if (isnonalpha(c))
{
- buffer[iout++] = '[';
+ buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET;
buffer[iout++] = png_digit[(c & 0xf0) >> 4];
buffer[iout++] = png_digit[c & 0x0f];
- buffer[iout++] = ']';
+ buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET;
}
else
{
}
if (error_message == NULL)
- buffer[iout] = 0;
+ buffer[iout] = '\0';
else
{
buffer[iout++] = ':';
buffer[iout++] = ' ';
- png_memcpy(buffer+iout, error_message, 64);
- buffer[iout+63] = 0;
+ png_memcpy(buffer + iout, error_message, PNG_MAX_ERROR_TEXT);
+ buffer[iout + PNG_MAX_ERROR_TEXT - 1] = '\0';
}
}
+#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);
+ 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 */
+#endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */
+#ifdef PNG_WARNINGS_SUPPORTED
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);
+ 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_structp 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 */
+
+#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_structp png_ptr, png_longjmp_ptr longjmp_fn,
+ size_t jmp_buf_size)
+{
+ if (png_ptr == NULL || jmp_buf_size != png_sizeof(jmp_buf))
+ return NULL;
+
+ png_ptr->longjmp_fn = longjmp_fn;
+ return &png_ptr->jmpbuf;
+}
+#endif
/* This is the default error handling function. Note that replacements for
* this function MUST NOT RETURN, or the program will likely crash. This
static void /* PRIVATE */
png_default_error(png_structp png_ptr, png_const_charp error_message)
{
-#ifndef PNG_NO_CONSOLE_IO
+#ifdef PNG_CONSOLE_IO_SUPPORTED
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
- if (*error_message == '#')
+ if (*error_message == PNG_LITERAL_SHARP)
{
+ /* Strip "#nnnn " from beginning of error message. */
int offset;
char error_number[16];
- for (offset=0; offset<15; offset++)
+ for (offset = 0; offset<15; offset++)
{
- error_number[offset] = *(error_message+offset+1);
- if (*(error_message+offset) == ' ')
+ error_number[offset] = error_message[offset + 1];
+ if (error_message[offset] == ' ')
break;
}
- if((offset > 1) && (offset < 15))
+ if ((offset > 1) && (offset < 15))
{
- error_number[offset-1]='\0';
- fprintf(stderr, "libpng error no. %s: %s\n", error_number,
- error_message+offset);
+ 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\n", error_message,offset);
+ {
+ fprintf(stderr, "libpng error: %s, offset=%d",
+ error_message, offset);
+ fprintf(stderr, PNG_STRING_NEWLINE);
+ }
}
else
#endif
- fprintf(stderr, "libpng error: %s\n", error_message);
-#else
- if (error_message)
- /* make compiler happy */ ;
+ {
+ fprintf(stderr, "libpng error: %s", error_message);
+ fprintf(stderr, PNG_STRING_NEWLINE);
+ }
#endif
#ifdef PNG_SETJMP_SUPPORTED
+ if (png_ptr && png_ptr->longjmp_fn)
+ {
# ifdef USE_FAR_KEYWORD
{
jmp_buf jmpbuf;
- png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf));
- longjmp(jmpbuf, 1);
+ png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
+ png_ptr->longjmp_fn(jmpbuf, 1);
}
# else
- longjmp(png_ptr->jmpbuf, 1);
-# endif
-#else
- if (png_ptr)
- /* make compiler happy */ ;
+ png_ptr->longjmp_fn(png_ptr->jmpbuf, 1);
+# endif
+ }
+#endif
+ /* Here if not setjmp support or if png_ptr is null. */
PNG_ABORT();
+#ifndef PNG_CONSOLE_IO_SUPPORTED
+ error_message = error_message; /* Make compiler happy */
#endif
}
+#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
static void /* PRIVATE */
png_default_warning(png_structp png_ptr, png_const_charp warning_message)
{
-#ifndef PNG_NO_CONSOLE_IO
+#ifdef PNG_CONSOLE_IO_SUPPORTED
# ifdef PNG_ERROR_NUMBERS_SUPPORTED
- if (*warning_message == '#')
+ if (*warning_message == PNG_LITERAL_SHARP)
{
int offset;
char warning_number[16];
- for (offset=0; offset<15; offset++)
+ for (offset = 0; offset < 15; offset++)
{
- warning_number[offset]=*(warning_message+offset+1);
- if (*(warning_message+offset) == ' ')
+ warning_number[offset] = warning_message[offset + 1];
+ if (warning_message[offset] == ' ')
break;
}
- if((offset > 1) && (offset < 15))
+ if ((offset > 1) && (offset < 15))
{
- warning_number[offset-1]='\0';
- fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
- warning_message+offset);
+ 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\n", warning_message);
+ {
+ fprintf(stderr, "libpng warning: %s",
+ warning_message);
+ fprintf(stderr, PNG_STRING_NEWLINE);
+ }
}
else
# endif
- fprintf(stderr, "libpng warning: %s\n", warning_message);
+ {
+ fprintf(stderr, "libpng warning: %s", warning_message);
+ fprintf(stderr, PNG_STRING_NEWLINE);
+ }
#else
- if (warning_message)
- /* appease compiler */ ;
+ warning_message = warning_message; /* Make compiler happy */
#endif
- if (png_ptr)
- return;
+ png_ptr = 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
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);
}
void PNGAPI
png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
{
- if(png_ptr != NULL)
+ if (png_ptr != NULL)
{
png_ptr->flags &=
((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
}
}
#endif
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
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