2
/* pngerror.c - stub functions for i/o and memory allocation
4
* libpng version 1.2.7 - September 12, 2004
5
* For conditions of distribution and use, see copyright notice in png.h
6
* Copyright (c) 1998-2004 Glenn Randers-Pehrson
7
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
10
* This file provides a location for all error handling. Users who
11
* need special error handling are expected to write replacement functions
12
* and use png_set_error_fn() to use those functions. See the instructions
19
static void /* PRIVATE */
20
png_default_error PNGARG((png_structp png_ptr,
21
png_const_charp error_message));
22
static void /* PRIVATE */
23
png_default_warning PNGARG((png_structp png_ptr,
24
png_const_charp warning_message));
26
/* This function is called whenever there is a fatal error. This function
27
* should not be changed. If there is a need to handle errors differently,
28
* you should supply a replacement error function and use png_set_error_fn()
29
* to replace the error function at run-time.
32
png_error(png_structp png_ptr, png_const_charp error_message)
34
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
36
if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
38
if (*error_message == '#')
41
for (offset=1; offset<15; offset++)
42
if (*(error_message+offset) == ' ')
44
if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
47
for (i=0; i<offset-1; i++)
48
msg[i]=error_message[i+1];
53
error_message+=offset;
57
if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
66
if (png_ptr != NULL && png_ptr->error_fn != NULL)
67
(*(png_ptr->error_fn))(png_ptr, error_message);
69
/* If the custom handler doesn't exist, or if it returns,
70
use the default handler, which will not return. */
71
png_default_error(png_ptr, error_message);
74
/* This function is called whenever there is a non-fatal error. This function
75
* should not be changed. If there is a need to handle warnings differently,
76
* you should supply a replacement warning function and use
77
* png_set_error_fn() to replace the warning function at run-time.
80
png_warning(png_structp png_ptr, png_const_charp warning_message)
83
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
84
if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
87
if (*warning_message == '#')
89
for (offset=1; offset<15; offset++)
90
if (*(warning_message+offset) == ' ')
94
if (png_ptr != NULL && png_ptr->warning_fn != NULL)
95
(*(png_ptr->warning_fn))(png_ptr, warning_message+offset);
97
png_default_warning(png_ptr, warning_message+offset);
100
/* These utilities are used internally to build an error message that relates
101
* to the current chunk. The chunk name comes from png_ptr->chunk_name,
102
* this is used to prefix the message. The message is limited in length
103
* to 63 bytes, the name characters are output as hex digits wrapped in []
104
* if the character is invalid.
106
#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
107
static PNG_CONST char png_digit[16] = {
108
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
109
'A', 'B', 'C', 'D', 'E', 'F'
112
static void /* PRIVATE */
113
png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
116
int iout = 0, iin = 0;
120
int c = png_ptr->chunk_name[iin++];
123
buffer[iout++] = '[';
124
buffer[iout++] = png_digit[(c & 0xf0) >> 4];
125
buffer[iout++] = png_digit[c & 0x0f];
126
buffer[iout++] = ']';
130
buffer[iout++] = (png_byte)c;
134
if (error_message == NULL)
138
buffer[iout++] = ':';
139
buffer[iout++] = ' ';
140
png_strncpy(buffer+iout, error_message, 63);
146
png_chunk_error(png_structp png_ptr, png_const_charp error_message)
149
png_format_buffer(png_ptr, msg, error_message);
150
png_error(png_ptr, msg);
154
png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
157
png_format_buffer(png_ptr, msg, warning_message);
158
png_warning(png_ptr, msg);
161
/* This is the default error handling function. Note that replacements for
162
* this function MUST NOT RETURN, or the program will likely crash. This
163
* function is used by default, or if the program supplies NULL for the
164
* error function pointer in png_set_error_fn().
166
static void /* PRIVATE */
167
png_default_error(png_structp png_ptr, png_const_charp error_message)
169
#ifndef PNG_NO_CONSOLE_IO
170
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
171
if (*error_message == '#')
174
char error_number[16];
175
for (offset=0; offset<15; offset++)
177
error_number[offset] = *(error_message+offset+1);
178
if (*(error_message+offset) == ' ')
181
if((offset > 1) && (offset < 15))
183
error_number[offset-1]='\0';
184
fprintf(stderr, "libpng error no. %s: %s\n", error_number,
185
error_message+offset);
188
fprintf(stderr, "libpng error: %s, offset=%d\n", error_message,offset);
192
fprintf(stderr, "libpng error: %s\n", error_message);
195
#ifdef PNG_SETJMP_SUPPORTED
196
# ifdef USE_FAR_KEYWORD
199
png_memcpy(jmpbuf,png_ptr->jmpbuf,png_sizeof(jmp_buf));
203
longjmp(png_ptr->jmpbuf, 1);
206
/* make compiler happy */ ;
210
#ifdef PNG_NO_CONSOLE_IO
211
/* make compiler happy */ ;
212
if (&error_message != NULL)
217
/* This function is called when there is a warning, but the library thinks
218
* it can continue anyway. Replacement functions don't have to do anything
219
* here if you don't want them to. In the default configuration, png_ptr is
220
* not used, but it is passed in case it may be useful.
222
static void /* PRIVATE */
223
png_default_warning(png_structp png_ptr, png_const_charp warning_message)
225
#ifndef PNG_NO_CONSOLE_IO
226
# ifdef PNG_ERROR_NUMBERS_SUPPORTED
227
if (*warning_message == '#')
230
char warning_number[16];
231
for (offset=0; offset<15; offset++)
233
warning_number[offset]=*(warning_message+offset+1);
234
if (*(warning_message+offset) == ' ')
237
if((offset > 1) && (offset < 15))
239
warning_number[offset-1]='\0';
240
fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
241
warning_message+offset);
244
fprintf(stderr, "libpng warning: %s\n", warning_message);
248
fprintf(stderr, "libpng warning: %s\n", warning_message);
250
/* make compiler happy */ ;
254
/* make compiler happy */ ;
259
/* This function is called when the application wants to use another method
260
* of handling errors and warnings. Note that the error function MUST NOT
261
* return to the calling routine or serious problems will occur. The return
262
* method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
265
png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
266
png_error_ptr error_fn, png_error_ptr warning_fn)
268
png_ptr->error_ptr = error_ptr;
269
png_ptr->error_fn = error_fn;
270
png_ptr->warning_fn = warning_fn;
274
/* This function returns a pointer to the error_ptr associated with the user
275
* functions. The application should free any memory associated with this
276
* pointer before png_write_destroy and png_read_destroy are called.
279
png_get_error_ptr(png_structp png_ptr)
281
return ((png_voidp)png_ptr->error_ptr);
285
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
287
png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
292
((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);