1 files changed, 73 insertions, 0 deletions
diff --git a/avar.c b/avar.c
new file mode 100644
index 0000000..ad7293e
--- /dev/null
+++ b/avar.c
@@ -0,0 +1,73 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libparsesfnt_parse_avar(
+			const char *data, size_t size,
+			struct libparsesfnt_avar *infop,
+			const struct libparsesfnt_tabdir_entry *tag)
+{
+	return PARSE(LIBPARSESFNT_AVAR__, tag->offset, 0, 0, 0, 1, tag);
+}
+
+
+static uint16_t
+avar_parse16(const char *data)
+{
+	uint16_t b1 = (uint16_t)((const uint8_t *)data)[0];
+	uint16_t b2 = (uint16_t)((const uint8_t *)data)[1];
+	b1 = (uint16_t)(b1 << 8);
+	b2 = (uint16_t)(b2 << 0);
+	return (uint16_t)(b1 | b2);
+}
+
+int
+libparsesfnt_parse_avar_entries(
+			const char *data, size_t size,
+			struct libparsesfnt_avar_entry *infop,
+			const struct libparsesfnt_tabdir_entry *tag,
+			size_t *offsetp, size_t count)
+{
+	size_t offset = offsetp ? *offsetp : 0;
+	if (offset < 8) {
+		if (tag->length < 8) {
+			errno = EBFONT;
+			return -1;
+		}
+		offset = 8;
+	}
+	if ((size_t)tag->length < offset || size < (size_t)tag->length - offset) {
+		errno = EBFONT;
+		return -1;
+	}
+	while (count--) {
+		if (tag->length - offset < 2) {
+			errno = EBFONT;
+			return -1;
+		}
+		infop->pair_count = avar_parse16(&data[offset]);
+		offset += 2;
+		infop->libparsesfnt_subentry_location = offset;
+		memset(infop->__padding1, 0, sizeof(infop->__padding1));
+		if ((size_t)infop->pair_count > ((size_t)tag->length - offset) / 4) {
+			errno = EBFONT;
+			return -1;
+		}
+		infop++;
+	}
+	if (offsetp)
+		*offsetp = offset;
+	return 0;
+}
+
+
+int
+libparsesfnt_parse_avar_subentries(
+			const char *data, size_t size,
+			struct libparsesfnt_avar_subentry *infop,
+			const struct libparsesfnt_avar_entry *entry,
+			size_t first, size_t count)
+{
+	return PARSE(LIBPARSESFNT_AVAR_SUBENTRY__, entry->libparsesfnt_subentry_location, 0, 0, first, count, NULL);
+}