/* pngerror.c - stub functions for i/o and memory allocation
*
- * libpng 1.0.3 - January 14, 1999
+ * Last changed in libpng 1.2.20 September 8, 2007
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 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.)
*
* This file provides a location for all error handling. Users who
* need special error handling are expected to write replacement functions
#define PNG_INTERNAL
#include "png.h"
-static void png_default_error PNGARG((png_structp png_ptr,
- png_const_charp message));
-static void png_default_warning PNGARG((png_structp png_ptr,
- png_const_charp message));
+#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.
*/
-void
-png_error(png_structp png_ptr, png_const_charp message)
+#ifndef PNG_NO_ERROR_TEXT
+void PNGAPI
+png_error(png_structp png_ptr, png_const_charp error_message)
{
- if (png_ptr->error_fn != NULL)
- (*(png_ptr->error_fn))(png_ptr, message);
+#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 == '#')
+ {
+ 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
+ if (png_ptr != NULL && png_ptr->error_fn != NULL)
+ (*(png_ptr->error_fn))(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
+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 following returns or doesn't exist, use the default function,
- which will not return */
- png_default_error(png_ptr, 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, '\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_set_error_fn() to replace the warning function at run-time.
*/
-void
-png_warning(png_structp png_ptr, png_const_charp message)
+void PNGAPI
+png_warning(png_structp png_ptr, png_const_charp warning_message)
{
- if (png_ptr->warning_fn != NULL)
- (*(png_ptr->warning_fn))(png_ptr, 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 == '#')
+ {
+ 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);
+ }
else
- png_default_warning(png_ptr, message);
+ 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,
* 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'
};
-static void
-png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message)
+#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)
{
int iout = 0, iin = 0;
- while (iin < 4) {
+ while (iin < 4)
+ {
int c = png_ptr->chunk_name[iin++];
- if (isnonalpha(c)) {
+ if (isnonalpha(c))
+ {
buffer[iout++] = '[';
buffer[iout++] = png_digit[(c & 0xf0) >> 4];
- buffer[iout++] = png_digit[c & 0xf];
+ buffer[iout++] = png_digit[c & 0x0f];
buffer[iout++] = ']';
- } else {
- buffer[iout++] = c;
+ }
+ else
+ {
+ buffer[iout++] = (png_byte)c;
}
}
- if (message == NULL)
+ if (error_message == NULL)
buffer[iout] = 0;
- else {
+ else
+ {
buffer[iout++] = ':';
buffer[iout++] = ' ';
- png_memcpy(buffer+iout, message, 64);
+ png_strncpy(buffer+iout, error_message, 63);
buffer[iout+63] = 0;
}
}
-void
-png_chunk_error(png_structp png_ptr, png_const_charp message)
+#ifdef PNG_READ_SUPPORTED
+void PNGAPI
+png_chunk_error(png_structp png_ptr, png_const_charp error_message)
{
- char msg[16+64];
- png_format_buffer(png_ptr, msg, message);
- png_error(png_ptr, msg);
+ char msg[18+64];
+ 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) */
-void
-png_chunk_warning(png_structp png_ptr, png_const_charp message)
+#ifndef PNG_NO_WARNINGS
+void PNGAPI
+png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
{
- char msg[16+64];
- png_format_buffer(png_ptr, msg, message);
- png_warning(png_ptr, msg);
+ char msg[18+64];
+ 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
* function is used by default, or if the program supplies NULL for the
* error function pointer in png_set_error_fn().
*/
-static void
-png_default_error(png_structp png_ptr, png_const_charp message)
+static void /* PRIVATE */
+png_default_error(png_structp png_ptr, png_const_charp error_message)
{
#ifndef PNG_NO_CONSOLE_IO
- fprintf(stderr, "libpng error: %s\n", message);
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ if (*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\n", error_number,
+ error_message+offset);
+ }
+ else
+ fprintf(stderr, "libpng error: %s, offset=%d\n", error_message,offset);
+ }
+ else
+#endif
+ fprintf(stderr, "libpng error: %s\n", error_message);
#endif
-#ifdef USE_FAR_KEYWORD
+#ifdef PNG_SETJMP_SUPPORTED
+ if (png_ptr)
+ {
+# ifdef USE_FAR_KEYWORD
{
jmp_buf jmpbuf;
- png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf));
+ png_memcpy(jmpbuf, png_ptr->jmpbuf, png_sizeof(jmp_buf));
longjmp(jmpbuf, 1);
}
-#else
+# else
longjmp(png_ptr->jmpbuf, 1);
+# endif
+ }
+#else
+ PNG_ABORT();
+#endif
+#ifdef PNG_NO_CONSOLE_IO
+ 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
* not used, but it is passed in case it may be useful.
*/
-static void
-png_default_warning(png_structp png_ptr, png_const_charp message)
+static void /* PRIVATE */
+png_default_warning(png_structp png_ptr, png_const_charp warning_message)
{
#ifndef PNG_NO_CONSOLE_IO
- fprintf(stderr, "libpng warning: %s\n", message);
+# ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ if (*warning_message == '#')
+ {
+ 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\n", warning_number,
+ warning_message+offset);
+ }
+ else
+ fprintf(stderr, "libpng warning: %s\n", warning_message);
+ }
+ else
+# endif
+ fprintf(stderr, "libpng warning: %s\n", warning_message);
+#else
+ warning_message = warning_message; /* make compiler happy */
#endif
- if (png_ptr == NULL)
- 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
* return to the calling routine or serious problems will occur. The return
* method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
*/
-void
+void PNGAPI
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;
* functions. The application should free any memory associated with this
* pointer before png_write_destroy and png_read_destroy are called.
*/
-png_voidp
+png_voidp PNGAPI
png_get_error_ptr(png_structp 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_structp 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
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */
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