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
|
#include <stdio.h>
#include "dct.h"
#include "bmpjpeg.h"
#define ENCODE 0
#define DECODE 1
#define MAXROWS 1024
#define MAXCOLS 768
#define HEADER 54
#define SOI_MK 0xFFD8 /* start of image */
#define SOF_MK 0xFFC0 /* start of frame */
#define EOI_MK 0xFFD9 /* end of image */
#define DRI_MK 0xFFDD /* restart interval */
#define get_size(fi) (((unsigned int)Image1[fi]) << 8) + (unsigned int)Image1[fi+1]
unsigned char Image1[MAXCOLS*3*MAXROWS+HEADER];
int main(int argc, char *argv[]) {
int retval, i;
int workspace[DCTSIZE_BLOCK];
unsigned char blok8x8[64*3];
int type, hCounter = 0;
int x_size, y_size, offset, depth;
char *fileIn, *fileOut;
FILE *fI, *fO;
unsigned char ch, mrgb[3];
unsigned int aux;
/*******************************************************************************************/
/* Just for testing on the PC */
if(argc != 4)
{
printf("need more arguments, 0|1 for de/encrypt and 2 more for the in/ouput files");
return 0;
}
type = atoi(argv[1]);
fileIn = argv[2];
fileOut = argv[3];
if (NULL == (fI = fopen(fileIn, "rb"))){
printf("unable to open the file to read from (%s)",fileIn);
return 0;
}
if ((fO = fopen(fileOut,"wb")) == NULL) {
printf("unable to open the file to write (%s)",fileOut);
return 0;
}
/* Read the max possible size to the memory */
fread(Image1, sizeof(unsigned char), (MAXROWS*MAXCOLS*3+HEADER), fI);
/*******************************************************************************************/
/* The image must be in the memory by now */
switch(type) {
case ENCODE:
offset = ((int)Image1[13] << 24) + ((int)Image1[12] << 16) + ((int)Image1[11] << 8) + Image1[10];
x_size = ((int)Image1[21] << 24) + ((int)Image1[20] << 16) + ((int)Image1[19] << 8) + Image1[18];
y_size = ((int)Image1[25] << 24) + ((int)Image1[24] << 16) + ((int)Image1[23] << 8) + Image1[22];
depth = ((int)Image1[29] << 8) + Image1[28];
/**/ printf("Image Resolution: %d x %d x %i Offset: %i\n", x_size, y_size, depth, offset);
break;
case DECODE:
/* First find the SOI marker: */
aux = get_size(hCounter); hCounter+=2;
if (aux != SOI_MK)
{ printf("INFO:\tNO SOI marker!\n"); return 0;}
printf("%ld:\tINFO:\tFound the SOI marker!\n", hCounter);
/* Read first marker */
while( aux != SOF_MK)
{
aux = get_size(hCounter); hCounter+=2;
if(aux == SOF_MK)
{
get_size(hCounter); hCounter+=2; /* header size, don't care */
/* load basic image parameters */
hCounter++; /* precision, 8bit, don't care */
y_size = get_size(hCounter); hCounter+=2;
x_size = get_size(hCounter); hCounter+=2;
printf("\tINFO:\tImage size is %d by %d\n", x_size, y_size);
depth = Image1[hCounter]; /* # of components */
printf("\tINFO:\t");
switch (depth)
{
case 1:
printf("Monochrome");
break;
case 3:
printf("Color");
break;
default:
printf("Not a");
break;
}
printf(" JPEG image!\n");
return 0;
}
else
{
hCounter = hCounter + get_size(hCounter);
}
}
}
retval = 0;
type = ENCODE;
printf("Before:");
for(i=0;i<(x_size*y_size*3);i++)
{
if((i%24)==0) printf("\n");
printf("%02x ",Image1[i+offset]);
}
printf("\nBMPto8x8 functie\n");
BMPto8x8AndYCbCr(0,0,x_size,y_size,offset,depth,Image1,blok8x8);
printf("\n8x8 Blok:\n");
for(i=0;i<64;i++)
{
printf("%02x",blok8x8[i]);
}
for(i=0;i<(x_size*y_size*3);i++)
{
Image1[i+offset] = 0;
}
printf("\n8x8toBMP functie\n");
YCbCrAnd8x8toBMP(0,0,x_size,y_size,offset,depth,Image1,blok8x8);
printf("\nAfter:\n");
for(i=0;i<(x_size*y_size*3);i++)
{
if((i%24)==0) printf("\n");
printf("%02x ",Image1[i+offset]);
}
switch(type) {
case ENCODE:
// RGB -> YUV ---> done
// Convert to 8x8 --> done
//BMPto8x8AndYCbCr(0,0,x_size,y_size,offset,depth,Image1,blok8x8);
// DCT
fdct(workspace);
// ZZ
// Q
// VLC (huffman)
break;
case DECODE:
// VLD (huffman)
// IQ
// ZZ
// IDCT
//idct(workspace);
// Convert 8x8 to BMP style -> done
// YUV -> RGB
// YCbCrAnd8x8toBMP()
break;
}
return retval;
}
|
