First commit

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 39 insertions, 0 deletions

diff --git a/libparsepcf_get_tables.c b/libparsepcf_get_tables.c
new file mode 100644
index 0000000..56cffc2
--- /dev/null
+++ b/libparsepcf_get_tables.c
@@ -0,0 +1,39 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+libparsepcf_get_tables(const char *file, size_t size, struct libparsepcf_table *tables, size_t first, size_t count)
+{
+	size_t pos = 8 + first * 16;
+	size_t i;
+
+	for (i = 0; i < count; i++, pos += 16) {
+		tables[i].type   = libparsepcf_parse_lsb_uint32__(&file[pos +  0]);
+		tables[i].format = libparsepcf_parse_lsb_uint32__(&file[pos +  4]);
+		tables[i].size   = libparsepcf_parse_lsb_uint32__(&file[pos +  8]);
+		tables[i].offset = libparsepcf_parse_lsb_uint32__(&file[pos + 12]);
+
+		if ((size_t)tables[i].offset > size)
+			goto ebfont;
+
+		/* For some reasons files specify table sizes such that they
+		 * actually except the boundary of the file, despite not using
+		 * that much data. Don't including this fix, but instead check
+		 * that the table size is not too large, will break your
+		 * favourite fonts. */
+		if ((size_t)tables[i].size > size - (size_t)tables[i].offset) {
+#if SIZE_MAX > UINT32_MAX
+			if (size - (size_t)tables[i].offset > (size_t)UINT32_MAX)
+				goto ebfont;
+#endif
+			tables[i].size = (uint32_t)(size - (size_t)tables[i].offset);
+		}
+	}
+
+	return 0;
+
+ebfont:
+	errno = EBFONT;
+	return -1;
+}