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
|
/* icontopbm.c - read a Sun icon file and produce a Netbpbm image.
**
** Copyright (C) 1988 by Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
/*
Most icon images are monochrome: Depth=1
Depth=8 images are extremely rare. At least some of these are color
images but we can't tell the pallete color order.
Output will be in pgm. Convert to ppm with pgmtoppm or pamlookup
if necessary.
*/
#include <assert.h>
#include <string.h>
#include "nstring.h"
#include "pbm.h"
#include "pgm.h"
static void
ReadIconFileHeader(FILE * const file,
int * const widthP,
int * const heightP,
int * const depthP,
int * const bitsPerItemP) {
unsigned int fieldCt;
fieldCt = 0;
*widthP = *heightP = -1;
for ( ; ; ) {
char variable[80+1];
int ch;
unsigned int i;
int value;
while ((ch = getc(file)) == ',' || ch == '\n' || ch == '\t' ||
ch == ' ')
;
for (i = 0;
ch != '=' && ch != ',' && ch != '\n' && ch != '\t' &&
ch != ' ' && (i < (sizeof(variable) - 1));
++i) {
variable[i] = ch;
if ((ch = getc( file )) == EOF)
pm_error( "invalid input file -- premature EOF" );
}
variable[i] = '\0';
if (streq(variable, "*/") && fieldCt > 0)
break;
if (fscanf( file, "%d", &value ) != 1)
continue;
if (streq( variable, "Width")) {
*widthP = value;
++fieldCt;
} else if (streq( variable, "Height")) {
*heightP = value;
++fieldCt;
} else if (streq( variable, "Depth")) {
if (value != 1 && value != 8)
pm_error("invalid depth");
*depthP = value;
++fieldCt;
} else if (streq(variable, "Format_version")) {
if (value != 1)
pm_error("invalid Format_version");
++fieldCt;
} else if (streq(variable, "Valid_bits_per_item")) {
if (value != 16 && value !=32)
pm_error("invalid Valid_bits_per_item");
*bitsPerItemP = value;
++fieldCt;
}
}
if (fieldCt < 5)
pm_error("invalid sun icon file header: "
"only %u out of required 5 fields present", fieldCt);
if (*widthP <= 0)
pm_error("invalid width (must be positive): %d", *widthP);
if (*heightP <= 0)
pm_error("invalid height (must be positive): %d", *heightP);
}
int
main(int argc, const char ** argv) {
FILE * ifP;
bit * bitrow;
gray * grayrow;
int rows, cols, depth, row, format, maxval, colChars, bitsPerItem;
pm_proginit(&argc, argv);
if (argc-1 > 1)
pm_error("Too many arguments (%u). Program takes at most one: "
"name of input file", argc-1);
if (argc-1 == 1)
ifP = pm_openr(argv[1]);
else
ifP = stdin;
ReadIconFileHeader(ifP, &cols, &rows, &depth, &bitsPerItem);
if (depth == 1) {
format = PBM_TYPE;
maxval = 1;
pbm_writepbminit(stdout, cols, rows, 0);
bitrow = pbm_allocrow_packed(cols);
colChars = cols / 8;
} else {
assert(depth == 8);
format = PGM_TYPE;
maxval = 255;
grayrow = pgm_allocrow(cols);
colChars = cols / depth;
}
for (row = 0; row < rows; ++row) {
unsigned int colChar;
for (colChar = 0; colChar < colChars; ++colChar) {
unsigned int data;
int status;
/* read 8 bits */
if (row==0 && colChar == 0)
status = fscanf(ifP, " 0x%2x", &data);
else if (colChar % (bitsPerItem/8) == 0)
status = fscanf(ifP, ", 0x%2x", &data);
else
status = fscanf(ifP, "%2x", &data);
/* write 8 bits */
if (status == 1) {
if (format == PBM_TYPE)
bitrow[colChar] = data;
else
grayrow[colChar] = data;
} else
pm_error("error scanning bits item %u" , colChar);
}
/* output row */
if (format == PBM_TYPE)
pbm_writepbmrow_packed(stdout, bitrow, cols, 0);
else
pgm_writepgmrow(stdout, grayrow, cols, maxval, 0);
}
pm_close(ifP);
pm_close(stdout);
return 0;
}
|
