1 #include <stdio.h> 2 #include <stdlib.h> 3 4 #if defined(__linux__) 5 #include <stdint.h> 6 #else 7 #ifdef __CYGWIN__ 8 #include "elf.h" 9 #else 10 #include <inttypes.h> 11 #endif 12 #endif 13 14 typedef struct bitmap_s { /* bitmap description */ 15 uint16_t width; 16 uint16_t height; 17 uint8_t palette[256*3]; 18 uint8_t *data; 19 } bitmap_t; 20 21 #define DEFAULT_CMAP_SIZE 16 /* size of default color map */ 22 23 /* 24 * Neutralize little endians. 25 */ 26 uint16_t le_short(uint16_t x) 27 { 28 uint16_t val; 29 uint8_t *p = (uint8_t *)(&x); 30 31 val = (*p++ & 0xff) << 0; 32 val |= (*p & 0xff) << 8; 33 34 return val; 35 } 36 37 void skip_bytes (FILE *fp, int n) 38 { 39 while (n-- > 0) 40 fgetc (fp); 41 } 42 43 int main (int argc, char *argv[]) 44 { 45 int i, x; 46 FILE *fp; 47 bitmap_t bmp; 48 bitmap_t *b = &bmp; 49 uint16_t data_offset, n_colors; 50 51 if (argc < 2) { 52 fprintf (stderr, "Usage: %s file\n", argv[0]); 53 exit (EXIT_FAILURE); 54 } 55 56 if ((fp = fopen (argv[1], "rb")) == NULL) { 57 perror (argv[1]); 58 exit (EXIT_FAILURE); 59 } 60 61 if (fgetc (fp) != 'B' || fgetc (fp) != 'M') { 62 fprintf (stderr, "%s is not a bitmap file.\n", argv[1]); 63 exit (EXIT_FAILURE); 64 } 65 66 /* 67 * read width and height of the image, and the number of colors used; 68 * ignore the rest 69 */ 70 skip_bytes (fp, 8); 71 fread (&data_offset, sizeof (uint16_t), 1, fp); 72 skip_bytes (fp, 6); 73 fread (&b->width, sizeof (uint16_t), 1, fp); 74 skip_bytes (fp, 2); 75 fread (&b->height, sizeof (uint16_t), 1, fp); 76 skip_bytes (fp, 22); 77 fread (&n_colors, sizeof (uint16_t), 1, fp); 78 skip_bytes (fp, 6); 79 80 /* 81 * Repair endianess. 82 */ 83 data_offset = le_short(data_offset); 84 b->width = le_short(b->width); 85 b->height = le_short(b->height); 86 n_colors = le_short(n_colors); 87 88 /* assume we are working with an 8-bit file */ 89 if ((n_colors == 0) || (n_colors > 256 - DEFAULT_CMAP_SIZE)) { 90 /* reserve DEFAULT_CMAP_SIZE color map entries for default map */ 91 n_colors = 256 - DEFAULT_CMAP_SIZE; 92 } 93 94 printf ("/*\n" 95 " * Automatically generated by \"tools/bmp_logo\"\n" 96 " *\n" 97 " * DO NOT EDIT\n" 98 " *\n" 99 " */\n\n\n" 100 "#ifndef __BMP_LOGO_H__\n" 101 "#define __BMP_LOGO_H__\n\n" 102 "#define BMP_LOGO_WIDTH\t\t%d\n" 103 "#define BMP_LOGO_HEIGHT\t\t%d\n" 104 "#define BMP_LOGO_COLORS\t\t%d\n" 105 "#define BMP_LOGO_OFFSET\t\t%d\n" 106 "\n", 107 b->width, b->height, n_colors, 108 DEFAULT_CMAP_SIZE); 109 110 /* allocate memory */ 111 if ((b->data = (uint8_t *)malloc(b->width * b->height)) == NULL) { 112 fclose (fp); 113 printf ("Error allocating memory for file %s.\n", argv[1]); 114 exit (EXIT_FAILURE); 115 } 116 117 /* read and print the palette information */ 118 printf ("unsigned short bmp_logo_palette[] = {\n"); 119 120 for (i=0; i<n_colors; ++i) { 121 b->palette[(int)(i*3+2)] = fgetc(fp); 122 b->palette[(int)(i*3+1)] = fgetc(fp); 123 b->palette[(int)(i*3+0)] = fgetc(fp); 124 x=fgetc(fp); 125 126 printf ("%s0x0%X%X%X,%s", 127 ((i%8) == 0) ? "\t" : " ", 128 (b->palette[(int)(i*3+0)] >> 4) & 0x0F, 129 (b->palette[(int)(i*3+1)] >> 4) & 0x0F, 130 (b->palette[(int)(i*3+2)] >> 4) & 0x0F, 131 ((i%8) == 7) ? "\n" : "" 132 ); 133 } 134 135 /* seek to offset indicated by file header */ 136 fseek(fp, (long)data_offset, SEEK_SET); 137 138 /* read the bitmap; leave room for default color map */ 139 printf ("\n"); 140 printf ("};\n"); 141 printf ("\n"); 142 printf ("unsigned char bmp_logo_bitmap[] = {\n"); 143 for (i=(b->height-1)*b->width; i>=0; i-=b->width) { 144 for (x = 0; x < b->width; x++) { 145 b->data[(uint16_t) i + x] = (uint8_t) fgetc (fp) \ 146 + DEFAULT_CMAP_SIZE; 147 } 148 } 149 fclose (fp); 150 151 for (i=0; i<(b->height*b->width); ++i) { 152 if ((i%8) == 0) 153 putchar ('\t'); 154 printf ("0x%02X,%c", 155 b->data[i], 156 ((i%8) == 7) ? '\n' : ' ' 157 ); 158 } 159 printf ("\n" 160 "};\n\n" 161 "#endif /* __BMP_LOGO_H__ */\n" 162 ); 163 164 return (0); 165 } 166