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 __attribute__ ((__noreturn__)) 44 int error (char * msg, FILE *fp) 45 { 46 fprintf (stderr, "ERROR: %s\n", msg); 47 48 fclose (fp); 49 50 exit (EXIT_FAILURE); 51 } 52 53 int main (int argc, char *argv[]) 54 { 55 int i, x; 56 FILE *fp; 57 bitmap_t bmp; 58 bitmap_t *b = &bmp; 59 uint16_t data_offset, n_colors; 60 61 if (argc < 2) { 62 fprintf (stderr, "Usage: %s file\n", argv[0]); 63 exit (EXIT_FAILURE); 64 } 65 66 if ((fp = fopen (argv[1], "rb")) == NULL) { 67 perror (argv[1]); 68 exit (EXIT_FAILURE); 69 } 70 71 if (fgetc (fp) != 'B' || fgetc (fp) != 'M') 72 error ("Input file is not a bitmap", fp); 73 74 /* 75 * read width and height of the image, and the number of colors used; 76 * ignore the rest 77 */ 78 skip_bytes (fp, 8); 79 if (fread (&data_offset, sizeof (uint16_t), 1, fp) != 1) 80 error ("Couldn't read bitmap data offset", fp); 81 skip_bytes (fp, 6); 82 if (fread (&b->width, sizeof (uint16_t), 1, fp) != 1) 83 error ("Couldn't read bitmap width", fp); 84 skip_bytes (fp, 2); 85 if (fread (&b->height, sizeof (uint16_t), 1, fp) != 1) 86 error ("Couldn't read bitmap height", fp); 87 skip_bytes (fp, 22); 88 if (fread (&n_colors, sizeof (uint16_t), 1, fp) != 1) 89 error ("Couldn't read bitmap colors", fp); 90 skip_bytes (fp, 6); 91 92 /* 93 * Repair endianess. 94 */ 95 data_offset = le_short(data_offset); 96 b->width = le_short(b->width); 97 b->height = le_short(b->height); 98 n_colors = le_short(n_colors); 99 100 /* assume we are working with an 8-bit file */ 101 if ((n_colors == 0) || (n_colors > 256 - DEFAULT_CMAP_SIZE)) { 102 /* reserve DEFAULT_CMAP_SIZE color map entries for default map */ 103 n_colors = 256 - DEFAULT_CMAP_SIZE; 104 } 105 106 printf ("/*\n" 107 " * Automatically generated by \"tools/bmp_logo\"\n" 108 " *\n" 109 " * DO NOT EDIT\n" 110 " *\n" 111 " */\n\n\n" 112 "#ifndef __BMP_LOGO_H__\n" 113 "#define __BMP_LOGO_H__\n\n" 114 "#define BMP_LOGO_WIDTH\t\t%d\n" 115 "#define BMP_LOGO_HEIGHT\t\t%d\n" 116 "#define BMP_LOGO_COLORS\t\t%d\n" 117 "#define BMP_LOGO_OFFSET\t\t%d\n" 118 "\n", 119 b->width, b->height, n_colors, 120 DEFAULT_CMAP_SIZE); 121 122 /* allocate memory */ 123 if ((b->data = (uint8_t *)malloc(b->width * b->height)) == NULL) 124 error ("Error allocating memory for file", fp); 125 126 /* read and print the palette information */ 127 printf ("unsigned short bmp_logo_palette[] = {\n"); 128 129 for (i=0; i<n_colors; ++i) { 130 b->palette[(int)(i*3+2)] = fgetc(fp); 131 b->palette[(int)(i*3+1)] = fgetc(fp); 132 b->palette[(int)(i*3+0)] = fgetc(fp); 133 x=fgetc(fp); 134 135 printf ("%s0x0%X%X%X,%s", 136 ((i%8) == 0) ? "\t" : " ", 137 (b->palette[(int)(i*3+0)] >> 4) & 0x0F, 138 (b->palette[(int)(i*3+1)] >> 4) & 0x0F, 139 (b->palette[(int)(i*3+2)] >> 4) & 0x0F, 140 ((i%8) == 7) ? "\n" : "" 141 ); 142 } 143 144 /* seek to offset indicated by file header */ 145 fseek(fp, (long)data_offset, SEEK_SET); 146 147 /* read the bitmap; leave room for default color map */ 148 printf ("\n"); 149 printf ("};\n"); 150 printf ("\n"); 151 printf ("unsigned char bmp_logo_bitmap[] = {\n"); 152 for (i=(b->height-1)*b->width; i>=0; i-=b->width) { 153 for (x = 0; x < b->width; x++) { 154 b->data[(uint16_t) i + x] = (uint8_t) fgetc (fp) \ 155 + DEFAULT_CMAP_SIZE; 156 } 157 } 158 fclose (fp); 159 160 for (i=0; i<(b->height*b->width); ++i) { 161 if ((i%8) == 0) 162 putchar ('\t'); 163 printf ("0x%02X,%c", 164 b->data[i], 165 ((i%8) == 7) ? '\n' : ' ' 166 ); 167 } 168 printf ("\n" 169 "};\n\n" 170 "#endif /* __BMP_LOGO_H__ */\n" 171 ); 172 173 return (0); 174 } 175