/[pcsx2_0.9.7]/trunk/3rdparty/wxWidgets/src/png/pngwio.c
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Annotation of /trunk/3rdparty/wxWidgets/src/png/pngwio.c

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Revision 31 - (hide annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (10 years, 2 months ago) by william
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committing r3113 initial commit again...
1 william 31
2     /* pngwio.c - functions for data output
3     *
4     * Last changed in libpng 1.2.37 [June 4, 2009]
5     * Copyright (c) 1998-2009 Glenn Randers-Pehrson
6     * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7     * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8     *
9     * This code is released under the libpng license.
10     * For conditions of distribution and use, see the disclaimer
11     * and license in png.h
12     *
13     * This file provides a location for all output. Users who need
14     * special handling are expected to write functions that have the same
15     * arguments as these and perform similar functions, but that possibly
16     * use different output methods. Note that you shouldn't change these
17     * functions, but rather write replacement functions and then change
18     * them at run time with png_set_write_fn(...).
19     */
20    
21     #define PNG_INTERNAL
22     #include "png.h"
23     #ifdef PNG_WRITE_SUPPORTED
24    
25     /* Write the data to whatever output you are using. The default routine
26     * writes to a file pointer. Note that this routine sometimes gets called
27     * with very small lengths, so you should implement some kind of simple
28     * buffering if you are using unbuffered writes. This should never be asked
29     * to write more than 64K on a 16 bit machine.
30     */
31    
32     void /* PRIVATE */
33     png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
34     {
35     if (png_ptr->write_data_fn != NULL )
36     (*(png_ptr->write_data_fn))(png_ptr, data, length);
37     else
38     png_error(png_ptr, "Call to NULL write function");
39     }
40    
41     #if !defined(PNG_NO_STDIO)
42     /* This is the function that does the actual writing of data. If you are
43     * not writing to a standard C stream, you should create a replacement
44     * write_data function and use it at run time with png_set_write_fn(), rather
45     * than changing the library.
46     */
47     #ifndef USE_FAR_KEYWORD
48     void PNGAPI
49     png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
50     {
51     png_uint_32 check;
52    
53     if (png_ptr == NULL)
54     return;
55     #if defined(_WIN32_WCE)
56     if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
57     check = 0;
58     #else
59     check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
60     #endif
61     if (check != length)
62     png_error(png_ptr, "Write Error");
63     }
64     #else
65     /* This is the model-independent version. Since the standard I/O library
66     * can't handle far buffers in the medium and small models, we have to copy
67     * the data.
68     */
69    
70     #define NEAR_BUF_SIZE 1024
71     #define MIN(a,b) (a <= b ? a : b)
72    
73     void PNGAPI
74     png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
75     {
76     png_uint_32 check;
77     png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */
78     png_FILE_p io_ptr;
79    
80     if (png_ptr == NULL)
81     return;
82     /* Check if data really is near. If so, use usual code. */
83     near_data = (png_byte *)CVT_PTR_NOCHECK(data);
84     io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
85     if ((png_bytep)near_data == data)
86     {
87     #if defined(_WIN32_WCE)
88     if ( !WriteFile(io_ptr, near_data, length, &check, NULL) )
89     check = 0;
90     #else
91     check = fwrite(near_data, 1, length, io_ptr);
92     #endif
93     }
94     else
95     {
96     png_byte buf[NEAR_BUF_SIZE];
97     png_size_t written, remaining, err;
98     check = 0;
99     remaining = length;
100     do
101     {
102     written = MIN(NEAR_BUF_SIZE, remaining);
103     png_memcpy(buf, data, written); /* Copy far buffer to near buffer */
104     #if defined(_WIN32_WCE)
105     if ( !WriteFile(io_ptr, buf, written, &err, NULL) )
106     err = 0;
107     #else
108     err = fwrite(buf, 1, written, io_ptr);
109     #endif
110     if (err != written)
111     break;
112    
113     else
114     check += err;
115    
116     data += written;
117     remaining -= written;
118     }
119     while (remaining != 0);
120     }
121     if (check != length)
122     png_error(png_ptr, "Write Error");
123     }
124    
125     #endif
126     #endif
127    
128     /* This function is called to output any data pending writing (normally
129     * to disk). After png_flush is called, there should be no data pending
130     * writing in any buffers.
131     */
132     #if defined(PNG_WRITE_FLUSH_SUPPORTED)
133     void /* PRIVATE */
134     png_flush(png_structp png_ptr)
135     {
136     if (png_ptr->output_flush_fn != NULL)
137     (*(png_ptr->output_flush_fn))(png_ptr);
138     }
139    
140     #if !defined(PNG_NO_STDIO)
141     void PNGAPI
142     png_default_flush(png_structp png_ptr)
143     {
144     #if !defined(_WIN32_WCE)
145     png_FILE_p io_ptr;
146     #endif
147     if (png_ptr == NULL)
148     return;
149     #if !defined(_WIN32_WCE)
150     io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
151     fflush(io_ptr);
152     #endif
153     }
154     #endif
155     #endif
156    
157     /* This function allows the application to supply new output functions for
158     * libpng if standard C streams aren't being used.
159     *
160     * This function takes as its arguments:
161     * png_ptr - pointer to a png output data structure
162     * io_ptr - pointer to user supplied structure containing info about
163     * the output functions. May be NULL.
164     * write_data_fn - pointer to a new output function that takes as its
165     * arguments a pointer to a png_struct, a pointer to
166     * data to be written, and a 32-bit unsigned int that is
167     * the number of bytes to be written. The new write
168     * function should call png_error(png_ptr, "Error msg")
169     * to exit and output any fatal error messages. May be
170     * NULL, in which case libpng's default function will
171     * be used.
172     * flush_data_fn - pointer to a new flush function that takes as its
173     * arguments a pointer to a png_struct. After a call to
174     * the flush function, there should be no data in any buffers
175     * or pending transmission. If the output method doesn't do
176     * any buffering of ouput, a function prototype must still be
177     * supplied although it doesn't have to do anything. If
178     * PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
179     * time, output_flush_fn will be ignored, although it must be
180     * supplied for compatibility. May be NULL, in which case
181     * libpng's default function will be used, if
182     * PNG_WRITE_FLUSH_SUPPORTED is defined. This is not
183     * a good idea if io_ptr does not point to a standard
184     * *FILE structure.
185     */
186     void PNGAPI
187     png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
188     png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
189     {
190     if (png_ptr == NULL)
191     return;
192    
193     png_ptr->io_ptr = io_ptr;
194    
195     #if !defined(PNG_NO_STDIO)
196     if (write_data_fn != NULL)
197     png_ptr->write_data_fn = write_data_fn;
198    
199     else
200     png_ptr->write_data_fn = png_default_write_data;
201     #else
202     png_ptr->write_data_fn = write_data_fn;
203     #endif
204    
205     #if defined(PNG_WRITE_FLUSH_SUPPORTED)
206     #if !defined(PNG_NO_STDIO)
207     if (output_flush_fn != NULL)
208     png_ptr->output_flush_fn = output_flush_fn;
209    
210     else
211     png_ptr->output_flush_fn = png_default_flush;
212     #else
213     png_ptr->output_flush_fn = output_flush_fn;
214     #endif
215     #endif /* PNG_WRITE_FLUSH_SUPPORTED */
216    
217     /* It is an error to read while writing a png file */
218     if (png_ptr->read_data_fn != NULL)
219     {
220     png_ptr->read_data_fn = NULL;
221     png_warning(png_ptr,
222     "Attempted to set both read_data_fn and write_data_fn in");
223     png_warning(png_ptr,
224     "the same structure. Resetting read_data_fn to NULL.");
225     }
226     }
227    
228     #if defined(USE_FAR_KEYWORD)
229     #if defined(_MSC_VER)
230     void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
231     {
232     void *near_ptr;
233     void FAR *far_ptr;
234     FP_OFF(near_ptr) = FP_OFF(ptr);
235     far_ptr = (void FAR *)near_ptr;
236    
237     if (check != 0)
238     if (FP_SEG(ptr) != FP_SEG(far_ptr))
239     png_error(png_ptr, "segment lost in conversion");
240    
241     return(near_ptr);
242     }
243     # else
244     void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
245     {
246     void *near_ptr;
247     void FAR *far_ptr;
248     near_ptr = (void FAR *)ptr;
249     far_ptr = (void FAR *)near_ptr;
250    
251     if (check != 0)
252     if (far_ptr != ptr)
253     png_error(png_ptr, "segment lost in conversion");
254    
255     return(near_ptr);
256     }
257     # endif
258     # endif
259     #endif /* PNG_WRITE_SUPPORTED */

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