1 files changed, 47 insertions, 0 deletions
diff --git a/lpg/libqr/qr-bitmap-pbm.c b/lpg/libqr/qr-bitmap-pbm.c
new file mode 100644
index 0000000..3bcddb2
--- /dev/null
+++ b/lpg/libqr/qr-bitmap-pbm.c
@@ -0,0 +1,47 @@
+#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;
+}
+