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#include <limits.h>
#include <stdio.h>
#include "qr-bitmap.h"
int qr_bitmap_write_pbm(const char * path,
const char * comment,
const struct qr_bitmap * bmp)
{
FILE * out;
size_t count, x, y;
out = fopen(path, "w");
if (!out)
return -1;
count = 0;
count += fputs("P1\n", out);
if (comment)
count += fprintf(out, "# %s\n", comment);
count += fprintf(out, "%u %u\n",
(unsigned)bmp->width,
(unsigned)bmp->height);
for (y = 0; y < bmp->height; ++y) {
unsigned char * row = bmp->bits + y * bmp->stride;
for (x = 0; x < bmp->width; ++x) {
int bit = row[x / CHAR_BIT] & (1 << x % CHAR_BIT);
if (x > 0)
fputc(' ', out);
fputc(bit ? '1' : '0', out);
}
count += fputc('\n', out);
}
if (ferror(out))
count = -1;
fclose(out);
return count;
}
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