1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
/*
* jmemsrc.c
*
* This file contains a decompression data source which takes a
* memory region as source.
* The only thing these routines really do is tell the library where the
* data is on construction (jpeg_mem_src()). Everything else is there
* for error checking purposes.
* Adapted from jdatasrc.c 9/96 by Ulrich von Zadow.
*/
/* this is not a core library module, so it doesn't define JPEG_INTERNALS */
#include <stdio.h>
extern "C"
{
#include "jpeglib.h"
#include "jerror.h"
}
#include "jmemsrc.h"
/*
* Initialize source --- called by jpeg_read_header
* before any data is actually read.
*/
METHODDEF(void)
init_source (j_decompress_ptr cinfo)
{
}
/*
* Fill the input buffer --- called whenever buffer is emptied.
*
* If this procedure gets called, we have a buffer overrun condition -
* there is not enough data in the buffer to satisfy the decoder.
* The procedure just generates a warning and feeds the decoder a fake
* JPEG_EOI marker.
*/
METHODDEF(boolean)
fill_input_buffer (j_decompress_ptr cinfo)
{
struct jpeg_source_mgr * src = cinfo->src;
static JOCTET FakeEOI[] = { 0xFF, JPEG_EOI };
/* Generate warning */
WARNMS(cinfo, JWRN_JPEG_EOF);
/* Insert a fake EOI marker */
src->next_input_byte = FakeEOI;
src->bytes_in_buffer = 2;
return TRUE;
}
METHODDEF(void)
skip_input_data (j_decompress_ptr cinfo, long num_bytes)
{
struct jpeg_source_mgr * src = cinfo->src;
if(num_bytes >= (long)src->bytes_in_buffer)
{
fill_input_buffer(cinfo);
return;
}
src->bytes_in_buffer -= num_bytes;
src->next_input_byte += num_bytes;
}
/*
* Terminate source --- called by jpeg_finish_decompress
* after all data has been read. Often a no-op.
*
* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
* application must deal with any cleanup that should happen even
* for error exit.
*/
METHODDEF(void)
term_source (j_decompress_ptr cinfo)
{
/* no work necessary here */
}
/*
* Prepare for input. This routine tells the jpeg library where to find
* the data & sets up the function pointers the library needs.
*
* Jo Hagelberg 15.4.99
* added pDataSrc and JMETHOD( notifyCppworld ) for progress notification
*/
GLOBAL(void)
jpeg_mem_src (
j_decompress_ptr cinfo,
JOCTET * pData,
int FileSize,
void *pDataSrc,
JMETHOD(void, notifyCppWorld, (j_common_ptr))
)
{
struct jpeg_source_mgr * src;
if (cinfo->src == NULL)
{ /* first time for this JPEG object? */
cinfo->src = (struct jpeg_source_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
sizeof(struct jpeg_source_mgr));
}
/* Jo Hagelberg 15.4.99
* added progress notification for JPEG
*/
if ( cinfo->progress == NULL)
{ /* first time and progress notification wanted? */
cinfo->progress = (struct jpeg_progress_mgr *)
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
sizeof(struct jpeg_progress_mgr));
/* static callback function in JpegDecoder */
cinfo->progress->progress_monitor = notifyCppWorld;
}
/* Jo Hagelberg 15.4.99
* put CDataSource instance ptr into client data, so we can use it in the callback
* NOTE: define a client data struct if this should be needed for other stuff, too
*/
cinfo->client_data = pDataSrc ;
src = cinfo->src;
/* Set up function pointers */
src->init_source = init_source;
src->fill_input_buffer = fill_input_buffer;
src->skip_input_data = skip_input_data;
src->resync_to_restart = jpeg_resync_to_restart; /* use default method */
src->term_source = term_source;
/* Set up data pointer */
src->bytes_in_buffer = FileSize;
src->next_input_byte = pData;
}
/*
/--------------------------------------------------------------------
|
| $Log: jmemsrc.cpp,v $
| Revision 1.4 2004/09/11 12:41:34 uzadow
| removed plstdpch.h
|
| Revision 1.3 2001/09/16 20:57:17 uzadow
| Linux version name prefix changes
|
| Revision 1.2 2001/09/15 21:02:44 uzadow
| Cleaned up stdpch.h and config.h to make them internal headers.
|
| Revision 1.1 2000/10/30 14:32:50 uzadow
| Removed dependency on jinclude.h
|
| Revision 1.5 2000/09/01 13:27:07 Administrator
| Minor bugfixes
|
|
\--------------------------------------------------------------------
*/
|
