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
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
|
/*
* ljpgtopnm.c --
*
* This is the main routine for the lossless JPEG decoder. Large
* parts are stolen from the IJG code, so:
*
* Copyright (C) 1991, 1992, Thomas G. Lane.
* Part of the Independent JPEG Group's software.
* See the file Copyright for more details.
*
* Copyright (c) 1993 Brian C. Smith, The Regents of the University
* of California
* All rights reserved.
*
* Copyright (c) 1994 Kongji Huang and Brian C. Smith.
* Cornell University
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* IN NO EVENT SHALL CORNELL UNIVERSITY BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF CORNELL
* UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* CORNELL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND CORNELL UNIVERSITY HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
#include <stdio.h>
#include <stdlib.h>
#if defined(_MSC_VER) && (defined(WIN32) || defined(_Windows) || \
defined(_WINDOWS) || defined(_WIN32) || defined(__WIN32__))
#include <malloc.h>
#endif
#include <string.h>
#include "jpeg.h"
#include "mcu.h"
#include "proto.h"
/*
* input and output file pointers
*/
FILE *inFile, *outFile;
void FreeArray2D(MCU *);
void WritePmHeader(DecompressInfo dcInfo);
/*
*--------------------------------------------------------------
*
* ReadJpegData --
*
* This is an interface routine to the JPEG library. The
* JPEG library calls this routine to "get more data"
*
* Results:
* Number of bytes actually returned.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
int
ReadJpegData (buffer, numBytes)
char *buffer; /* Place to put new data */
int numBytes; /* Number of bytes to put */
{
return fread(buffer, 1, numBytes, inFile);
}
/*
*--------------------------------------------------------------
*
* WritePmHeader --
*
* Output Portable Pixmap (PPM) or Portable
* Graymap (PGM) image header.
*
* Results:
* None.
*
* Side effects:
* The PPM or PGM header is written to file
* pointed by outFile.
*
*--------------------------------------------------------------
*/
void
WritePmHeader(dcInfo)
DecompressInfo dcInfo;
{
switch(dcInfo.numComponents) {
case 1: /* pgm */
if (dcInfo.dataPrecision==8) {
fprintf(outFile,"P5\n%d %d\n255\n",
dcInfo.imageWidth,dcInfo.imageHeight);
} else {
fprintf(outFile,"P5\n%d %d\n%d\n",
dcInfo.imageWidth,dcInfo.imageHeight,
((1<<dcInfo.dataPrecision)-1));
}
break;
case 3: /* ppm */
if (dcInfo.dataPrecision==8) {
fprintf(outFile,"P6\n%d %d\n255\n",
dcInfo.imageWidth,dcInfo.imageHeight);
} else {
fprintf(outFile,"P6\n%d %d\n%d\n",
dcInfo.imageWidth,dcInfo.imageHeight,
((1<<dcInfo.dataPrecision)-1));
}
break;
default:
fprintf(stderr,"Error: Unsupported image format.\n");
exit(-1);
}
}
/*
*--------------------------------------------------------------
*
* ArgParser --
*
* Command line parser.
*
* Results:
* Command line parameters and options are passed out.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static void
ArgParser(argc,argv,verbose,linFile,loutFile)
int argc;
char **argv;
int *verbose;
FILE **linFile, **loutFile;
{
int argn;
char *arg;
const char *usage="ppmtoljpeg [ -v -h ] [ inFile [outFile] ]";
int NumOfFile=0;
/*
* default values
*/
*linFile=stdin;
*loutFile=stdout;
*verbose=0;
for (argn = 1; argn < argc; argn++) {
arg=argv[argn];
if (*arg != '-') { /* process a file name */
if (NumOfFile==0) {
if ((*linFile=fopen(arg,"r"))==NULL) {
fprintf(stderr,"Can't open %s\n",arg);
exit(-1);
}
}
if (NumOfFile==1) {
if ((*loutFile=fopen(arg,"w"))==NULL) {
fprintf(stderr,"Can't open %s\n",arg);
exit(-1);
}
}
if (NumOfFile>1) {
fprintf(stderr,"%s\n",usage);
exit(-1);
}
NumOfFile++;
}
else { /* precess a option */
arg++;
switch (*arg) {
case 'h':
/* help flag */
fprintf(stderr,"Decode a lossless JPEG image into ");
fprintf(stderr,"a PPM or PGM image.\n");
fprintf(stderr,"Usage:\n");
fprintf(stderr,"%s\n",usage);
fprintf(stderr,"Default input: stdin\n");
fprintf(stderr,"Default output: stdout\n");
fprintf(stderr,"-h help\n");
fprintf(stderr,"-v verbose\n");
exit(1);
break;
case 'v':
/* verbose flag */
*verbose=1;
break;
default:
fprintf(stderr,"%s\n",usage);
exit(-1);
}
}
}
}
int
main(argc, argv)
int argc;
char **argv;
{
DecompressInfo dcInfo;
int verbose;
/*
* Process command line parameters.
*/
MEMSET(&dcInfo, 0, sizeof(dcInfo));
ArgParser(argc,argv,&verbose,&inFile,&outFile);
/*
* Read the JPEG File header, up to scan header, and initialize all
* the variables in the decompression information structure.
*/
ReadFileHeader (&dcInfo);
/*
* Loop through each scan in image. ReadScanHeader returns
* 0 once it consumes and EOI marker.
*/
if (!ReadScanHeader (&dcInfo)) {
fprintf (stderr, "Empty JPEG file\n");
exit (1);
}
/*
* Output image parameter if verbose flag is on.
*/
if (verbose) {
fprintf(stderr,"sample precision=%d\n",dcInfo.dataPrecision);
fprintf(stderr,"image height=%d\n",dcInfo.imageHeight);
fprintf(stderr,"image width=%d\n",dcInfo.imageWidth);
fprintf(stderr,"component=%d\n",dcInfo.numComponents);
}
/*
* Write PPM or PGM image header. Decode the image bits
* stream. Clean up everything when finished decoding.
*/
WritePmHeader(dcInfo);
DecoderStructInit(&dcInfo);
HuffDecoderInit(&dcInfo);
DecodeImage(&dcInfo);
FreeArray2D(mcuROW1);
FreeArray2D(mcuROW2);
if (ReadScanHeader (&dcInfo)) {
fprintf (stderr, "Warning: multiple scans detected in JPEG file\n");
fprintf (stderr, " not currently supported\n");
fprintf (stderr, " ignoring extra scans\n");
}
return 0;
}
|
