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source: vbox/trunk/src/libs/libpng-1.2.8/pngerror.c@ 14915

最後變更 在這個檔案從14915是 6393,由 vboxsync 提交於 17 年 前

export libpng and zlib so Windows and OS/2 builds cleanly.

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1
2/* pngerror.c - stub functions for i/o and memory allocation
3 *
4 * libpng version 1.2.8 - December 3, 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.)
9 *
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
13 * at each function.
14 */
15
16#define PNG_INTERNAL
17#include "png.h"
18
19static void /* PRIVATE */
20png_default_error PNGARG((png_structp png_ptr,
21 png_const_charp error_message));
22static void /* PRIVATE */
23png_default_warning PNGARG((png_structp png_ptr,
24 png_const_charp warning_message));
25
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.
30 */
31void PNGAPI
32png_error(png_structp png_ptr, png_const_charp error_message)
33{
34#ifdef PNG_ERROR_NUMBERS_SUPPORTED
35 char msg[16];
36 if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
37 {
38 if (*error_message == '#')
39 {
40 int offset;
41 for (offset=1; offset<15; offset++)
42 if (*(error_message+offset) == ' ')
43 break;
44 if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
45 {
46 int i;
47 for (i=0; i<offset-1; i++)
48 msg[i]=error_message[i+1];
49 msg[i]='\0';
50 error_message=msg;
51 }
52 else
53 error_message+=offset;
54 }
55 else
56 {
57 if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
58 {
59 msg[0]='0';
60 msg[1]='\0';
61 error_message=msg;
62 }
63 }
64 }
65#endif
66 if (png_ptr != NULL && png_ptr->error_fn != NULL)
67 (*(png_ptr->error_fn))(png_ptr, error_message);
68
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);
72}
73
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.
78 */
79void PNGAPI
80png_warning(png_structp png_ptr, png_const_charp warning_message)
81{
82 int offset = 0;
83#ifdef PNG_ERROR_NUMBERS_SUPPORTED
84 if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
85#endif
86 {
87 if (*warning_message == '#')
88 {
89 for (offset=1; offset<15; offset++)
90 if (*(warning_message+offset) == ' ')
91 break;
92 }
93 }
94 if (png_ptr != NULL && png_ptr->warning_fn != NULL)
95 (*(png_ptr->warning_fn))(png_ptr, warning_message+offset);
96 else
97 png_default_warning(png_ptr, warning_message+offset);
98}
99
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.
105 */
106#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))
107static PNG_CONST char png_digit[16] = {
108 '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
109 'A', 'B', 'C', 'D', 'E', 'F'
110};
111
112static void /* PRIVATE */
113png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
114 error_message)
115{
116 int iout = 0, iin = 0;
117
118 while (iin < 4)
119 {
120 int c = png_ptr->chunk_name[iin++];
121 if (isnonalpha(c))
122 {
123 buffer[iout++] = '[';
124 buffer[iout++] = png_digit[(c & 0xf0) >> 4];
125 buffer[iout++] = png_digit[c & 0x0f];
126 buffer[iout++] = ']';
127 }
128 else
129 {
130 buffer[iout++] = (png_byte)c;
131 }
132 }
133
134 if (error_message == NULL)
135 buffer[iout] = 0;
136 else
137 {
138 buffer[iout++] = ':';
139 buffer[iout++] = ' ';
140 png_strncpy(buffer+iout, error_message, 63);
141 buffer[iout+63] = 0;
142 }
143}
144
145void PNGAPI
146png_chunk_error(png_structp png_ptr, png_const_charp error_message)
147{
148 char msg[18+64];
149 png_format_buffer(png_ptr, msg, error_message);
150 png_error(png_ptr, msg);
151}
152
153void PNGAPI
154png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
155{
156 char msg[18+64];
157 png_format_buffer(png_ptr, msg, warning_message);
158 png_warning(png_ptr, msg);
159}
160
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().
165 */
166static void /* PRIVATE */
167png_default_error(png_structp png_ptr, png_const_charp error_message)
168{
169#ifndef PNG_NO_CONSOLE_IO
170#ifdef PNG_ERROR_NUMBERS_SUPPORTED
171 if (*error_message == '#')
172 {
173 int offset;
174 char error_number[16];
175 for (offset=0; offset<15; offset++)
176 {
177 error_number[offset] = *(error_message+offset+1);
178 if (*(error_message+offset) == ' ')
179 break;
180 }
181 if((offset > 1) && (offset < 15))
182 {
183 error_number[offset-1]='\0';
184 fprintf(stderr, "libpng error no. %s: %s\n", error_number,
185 error_message+offset);
186 }
187 else
188 fprintf(stderr, "libpng error: %s, offset=%d\n", error_message,offset);
189 }
190 else
191#endif
192 fprintf(stderr, "libpng error: %s\n", error_message);
193#endif
194
195#ifdef PNG_SETJMP_SUPPORTED
196# ifdef USE_FAR_KEYWORD
197 {
198 jmp_buf jmpbuf;
199 png_memcpy(jmpbuf,png_ptr->jmpbuf,png_sizeof(jmp_buf));
200 longjmp(jmpbuf, 1);
201 }
202# else
203 longjmp(png_ptr->jmpbuf, 1);
204# endif
205#else
206 /* make compiler happy */ ;
207 if (png_ptr)
208 PNG_ABORT();
209#endif
210#ifdef PNG_NO_CONSOLE_IO
211 /* make compiler happy */ ;
212 if (&error_message != NULL)
213 return;
214#endif
215}
216
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.
221 */
222static void /* PRIVATE */
223png_default_warning(png_structp png_ptr, png_const_charp warning_message)
224{
225#ifndef PNG_NO_CONSOLE_IO
226# ifdef PNG_ERROR_NUMBERS_SUPPORTED
227 if (*warning_message == '#')
228 {
229 int offset;
230 char warning_number[16];
231 for (offset=0; offset<15; offset++)
232 {
233 warning_number[offset]=*(warning_message+offset+1);
234 if (*(warning_message+offset) == ' ')
235 break;
236 }
237 if((offset > 1) && (offset < 15))
238 {
239 warning_number[offset-1]='\0';
240 fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
241 warning_message+offset);
242 }
243 else
244 fprintf(stderr, "libpng warning: %s\n", warning_message);
245 }
246 else
247# endif
248 fprintf(stderr, "libpng warning: %s\n", warning_message);
249#else
250 /* make compiler happy */ ;
251 if (warning_message)
252 return;
253#endif
254 /* make compiler happy */ ;
255 if (png_ptr)
256 return;
257}
258
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)
263 */
264void PNGAPI
265png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
266 png_error_ptr error_fn, png_error_ptr warning_fn)
267{
268 png_ptr->error_ptr = error_ptr;
269 png_ptr->error_fn = error_fn;
270 png_ptr->warning_fn = warning_fn;
271}
272
273
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.
277 */
278png_voidp PNGAPI
279png_get_error_ptr(png_structp png_ptr)
280{
281 return ((png_voidp)png_ptr->error_ptr);
282}
283
284
285#ifdef PNG_ERROR_NUMBERS_SUPPORTED
286void PNGAPI
287png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
288{
289 if(png_ptr != NULL)
290 {
291 png_ptr->flags &=
292 ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
293 }
294}
295#endif
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