1 #include "compiler.h"
2
3 enum {
4 MODE_GEN_INFO,
5 MODE_GEN_DATA,
6 MODE_GEN_BMP
7 };
8
9 typedef struct bitmap_s { /* bitmap description */
10 uint16_t width;
11 uint16_t height;
12 uint8_t palette[256*3];
13 uint8_t *data;
14 } bitmap_t;
15
16 #define DEFAULT_CMAP_SIZE 16 /* size of default color map */
17
usage(const char * prog)18 void usage(const char *prog)
19 {
20 fprintf(stderr, "Usage: %s [--gen-info|--gen-data|--gen-bmp] file\n",
21 prog);
22 }
23
24 /*
25 * Neutralize little endians.
26 */
le_short(uint16_t x)27 uint16_t le_short(uint16_t x)
28 {
29 uint16_t val;
30 uint8_t *p = (uint8_t *)(&x);
31
32 val = (*p++ & 0xff) << 0;
33 val |= (*p & 0xff) << 8;
34
35 return val;
36 }
37
skip_bytes(FILE * fp,int n)38 void skip_bytes (FILE *fp, int n)
39 {
40 while (n-- > 0)
41 fgetc (fp);
42 }
43
44 __attribute__ ((__noreturn__))
error(char * msg,FILE * fp)45 int error (char * msg, FILE *fp)
46 {
47 fprintf (stderr, "ERROR: %s\n", msg);
48
49 fclose (fp);
50
51 exit (EXIT_FAILURE);
52 }
53
gen_info(bitmap_t * b,uint16_t n_colors)54 void gen_info(bitmap_t *b, uint16_t n_colors)
55 {
56 printf("/*\n"
57 " * Automatically generated by \"tools/bmp_logo\"\n"
58 " *\n"
59 " * DO NOT EDIT\n"
60 " *\n"
61 " */\n\n\n"
62 "#ifndef __BMP_LOGO_H__\n"
63 "#define __BMP_LOGO_H__\n\n"
64 "#define BMP_LOGO_WIDTH\t\t%d\n"
65 "#define BMP_LOGO_HEIGHT\t\t%d\n"
66 "#define BMP_LOGO_COLORS\t\t%d\n"
67 "#define BMP_LOGO_OFFSET\t\t%d\n\n"
68 "extern unsigned short bmp_logo_palette[];\n"
69 "extern unsigned char bmp_logo_bitmap[];\n\n"
70 "#endif /* __BMP_LOGO_H__ */\n",
71 b->width, b->height, n_colors,
72 DEFAULT_CMAP_SIZE);
73 }
74
main(int argc,char * argv[])75 int main (int argc, char *argv[])
76 {
77 int mode, i, x;
78 int size;
79 FILE *fp;
80 bitmap_t bmp;
81 bitmap_t *b = &bmp;
82 uint16_t data_offset, n_colors, hdr_size;
83
84 if (argc < 3) {
85 usage(argv[0]);
86 exit (EXIT_FAILURE);
87 }
88
89 if (!strcmp(argv[1], "--gen-info"))
90 mode = MODE_GEN_INFO;
91 else if (!strcmp(argv[1], "--gen-data"))
92 mode = MODE_GEN_DATA;
93 else if (!strcmp(argv[1], "--gen-bmp"))
94 mode = MODE_GEN_BMP;
95 else {
96 usage(argv[0]);
97 exit(EXIT_FAILURE);
98 }
99
100 fp = fopen(argv[2], "rb");
101 if (!fp) {
102 perror(argv[2]);
103 exit (EXIT_FAILURE);
104 }
105
106 if (fgetc (fp) != 'B' || fgetc (fp) != 'M')
107 error ("Input file is not a bitmap", fp);
108
109 /*
110 * read width and height of the image, and the number of colors used;
111 * ignore the rest
112 */
113 skip_bytes (fp, 8);
114 if (fread (&data_offset, sizeof (uint16_t), 1, fp) != 1)
115 error ("Couldn't read bitmap data offset", fp);
116 skip_bytes(fp, 2);
117 if (fread(&hdr_size, sizeof(uint16_t), 1, fp) != 1)
118 error("Couldn't read bitmap header size", fp);
119 if (hdr_size < 40)
120 error("Invalid bitmap header", fp);
121 skip_bytes(fp, 2);
122 if (fread (&b->width, sizeof (uint16_t), 1, fp) != 1)
123 error ("Couldn't read bitmap width", fp);
124 skip_bytes (fp, 2);
125 if (fread (&b->height, sizeof (uint16_t), 1, fp) != 1)
126 error ("Couldn't read bitmap height", fp);
127 skip_bytes (fp, 22);
128 if (fread (&n_colors, sizeof (uint16_t), 1, fp) != 1)
129 error ("Couldn't read bitmap colors", fp);
130 skip_bytes(fp, hdr_size - 34);
131
132 /*
133 * Repair endianess.
134 */
135 data_offset = le_short(data_offset);
136 b->width = le_short(b->width);
137 b->height = le_short(b->height);
138 n_colors = le_short(n_colors);
139 size = b->width * b->height;
140
141 /* assume we are working with an 8-bit file */
142 if ((n_colors == 0) || (n_colors > 256 - DEFAULT_CMAP_SIZE)) {
143 /* reserve DEFAULT_CMAP_SIZE color map entries for default map */
144 n_colors = 256 - DEFAULT_CMAP_SIZE;
145 }
146
147 if (mode == MODE_GEN_INFO) {
148 gen_info(b, n_colors);
149 goto out;
150 }
151
152 printf("/*\n"
153 " * Automatically generated by \"tools/bmp_logo\"\n"
154 " *\n"
155 " * DO NOT EDIT\n"
156 " *\n"
157 " */\n\n\n"
158 "#ifndef __BMP_LOGO_DATA_H__\n"
159 "#define __BMP_LOGO_DATA_H__\n\n");
160
161 /* read and print the palette information */
162 printf("unsigned short bmp_logo_palette[] = {\n");
163
164 for (i=0; i<n_colors; ++i) {
165 b->palette[(int)(i*3+2)] = fgetc(fp);
166 b->palette[(int)(i*3+1)] = fgetc(fp);
167 b->palette[(int)(i*3+0)] = fgetc(fp);
168 x=fgetc(fp);
169
170 printf ("%s0x0%X%X%X,%s",
171 ((i%8) == 0) ? "\t" : " ",
172 (b->palette[(int)(i*3+0)] >> 4) & 0x0F,
173 (b->palette[(int)(i*3+1)] >> 4) & 0x0F,
174 (b->palette[(int)(i*3+2)] >> 4) & 0x0F,
175 ((i%8) == 7) ? "\n" : ""
176 );
177 }
178
179 /* seek to offset indicated by file header */
180 if (mode == MODE_GEN_BMP) {
181 /* copy full bmp file */
182 fseek(fp, 0L, SEEK_END);
183 size = ftell(fp);
184 fseek(fp, 0L, SEEK_SET);
185 } else {
186 fseek(fp, (long)data_offset, SEEK_SET);
187 }
188
189 /* allocate memory */
190 b->data = (uint8_t *)malloc(size);
191 if (!b->data)
192 error("Error allocating memory for file", fp);
193
194 /* read the bitmap; leave room for default color map */
195 printf ("\n");
196 printf ("};\n");
197 printf ("\n");
198 printf("unsigned char bmp_logo_bitmap[] = {\n");
199 if (mode == MODE_GEN_BMP) {
200 /* write full bmp */
201 for (i = 0; i < size; i++)
202 b->data[i] = (uint8_t)fgetc(fp);
203 } else {
204 for (i = (b->height - 1) * b->width; i >= 0; i -= b->width) {
205 for (x = 0; x < b->width; x++) {
206 b->data[i + x] = (uint8_t)fgetc(fp)
207 + DEFAULT_CMAP_SIZE;
208 }
209 }
210 }
211
212 for (i = 0; i < size; ++i) {
213 if ((i%8) == 0)
214 putchar ('\t');
215 printf ("0x%02X,%c",
216 b->data[i],
217 ((i%8) == 7) ? '\n' : ' '
218 );
219 }
220 printf ("\n"
221 "};\n\n"
222 "#endif /* __BMP_LOGO_DATA_H__ */\n"
223 );
224
225 out:
226 fclose(fp);
227 return 0;
228 }
229