1 files changed, 52 insertions, 0 deletions
diff --git a/libparsepcf_get_bitmaps.c b/libparsepcf_get_bitmaps.c
new file mode 100644
index 0000000..961da96
--- /dev/null
+++ b/libparsepcf_get_bitmaps.c
@@ -0,0 +1,52 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libparsepcf_get_bitmaps(const char *file, size_t size,
+                        const struct libparsepcf_table *table,
+                        struct libparsepcf_bitmaps *out)
+{
+	size_t pos, glyph_pad;
+	int msb = table->format & LIBPARSEPCF_BYTE;
+
+	(void) size;
+
+	if (table->size < 8)
+		goto ebfont;
+
+	pos = table->offset;
+
+	if (table->format != libparsepcf_parse_lsb_uint32__(&file[pos]))
+		goto ebfont;
+	pos += 4;
+
+	out->glyph_count = (size_t)PARSE_UINT32(&file[pos], msb);
+	pos += 4;
+
+	if (16 > table->size - (pos - table->offset) ||
+	    out->glyph_count > (table->size - (pos - table->offset) - 16) / 4)
+		goto ebfont;
+	pos += out->glyph_count * 4;
+	glyph_pad = (size_t)(table->format & LIBPARSEPCF_GLYPH_PAD_MASK);
+	out->bitmap_size = (size_t)PARSE_UINT32(&file[pos + 4 * glyph_pad], msb);
+	pos += 16;
+
+	out->bitmap_data = (const void *)&file[pos];
+	if (out->bitmap_size > table->size - (pos - table->offset))
+		goto ebfont;
+
+	out->bit_packing = (size_t)1 << ((table->format & LIBPARSEPCF_SCAN_UNIT_MASK) >> 4);
+	out->row_padding = (size_t)1 << ((table->format & LIBPARSEPCF_GLYPH_PAD_MASK) >> 0);
+	out->lsbyte = !!(table->format & LIBPARSEPCF_BYTE);
+	out->lsbit = !!(table->format & LIBPARSEPCF_BIT);
+
+	if (out->row_padding < out->bit_packing)
+		goto ebfont;
+
+	return 0;
+
+ebfont:
+	errno = EBFONT;
+	return -1;
+}