From fcffe4810f59de6a4f39596a37242022b68e7bc5 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Fri, 13 Aug 2021 18:06:45 +0200 Subject: First commit MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- hmtx.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 hmtx.c (limited to 'hmtx.c') diff --git a/hmtx.c b/hmtx.c new file mode 100644 index 0000000..bb63af5 --- /dev/null +++ b/hmtx.c @@ -0,0 +1,44 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" + + +int +libparsesfnt_parse_hmtx( + const char *data, size_t size, + struct libparsesfnt_hmtx_entry *infop, + const struct libparsesfnt_tabdir_entry *tag, + size_t first, size_t count) +{ + return PARSE(LIBPARSESFNT_HMTX_ENTRY__, tag->offset, 0, 0, first, count, tag); +} + + +int +libparsesfnt_get_hmtx_lsb_subtable_length( + size_t *lengthp, + const struct libparsesfnt_tabdir_entry *tag, const struct libparsesfnt_hhea *hhea) +{ + size_t off; + /* hhea->num_advances_in_hmtx_table is uint16_t, so overflow is impossible */ + off = (size_t)hhea->num_advances_in_hmtx_table * 4; + if (off > tag->length || (tag->length - off) % 2) { + errno = EBFONT; + return -1; + } + *lengthp = (tag->length - off) / 2; + return 0; +} + + +int +libparsesfnt_parse_hmtx_lsb_subtable( + const char *data, size_t size, + struct libparsesfnt_hmtx_lsb_subtable_entry *infop, + const struct libparsesfnt_tabdir_entry *tag, const struct libparsesfnt_hhea *hhea, + size_t first, size_t count) +{ + size_t off; + /* hhea->num_advances_in_hmtx_table is uint16_t, so overflow is impossible */ + off = (size_t)hhea->num_advances_in_hmtx_table * 4; + return PARSE(LIBPARSESFNT_HMTX_LSB_SUBTABLE_ENTRY__, tag->offset, off, 0, first, count, NULL); +} -- cgit v1.2.3-70-g09d2