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authorwolfbeast <mcwerewolf@wolfbeast.com>2019-11-14 10:02:36 +0100
committerwolfbeast <mcwerewolf@wolfbeast.com>2019-11-14 10:02:36 +0100
commit36975f3865948f3faa959fe386e58b22783bd379 (patch)
tree890182161b3e522f45f966574425d85972bff4a5 /modules/woff2/src/font.cc
parent787b4fe586456565c2dda457ad81f1dd420e9249 (diff)
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Issue #1288 - Part 3: Update woff2 component to 1.0.2
Diffstat (limited to 'modules/woff2/src/font.cc')
-rw-r--r--modules/woff2/src/font.cc38
1 files changed, 21 insertions, 17 deletions
diff --git a/modules/woff2/src/font.cc b/modules/woff2/src/font.cc
index 060673005..a45153e9c 100644
--- a/modules/woff2/src/font.cc
+++ b/modules/woff2/src/font.cc
@@ -1,18 +1,10 @@
-// Copyright 2013 Google Inc. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-// Font management utilities
+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+ Distributed under MIT license.
+ See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+/* Font management utilities */
#include "./font.h"
@@ -105,6 +97,12 @@ bool ReadTrueTypeFont(Buffer* file, const uint8_t* data, size_t len,
last_offset = i.first + i.second;
}
+ // Sanity check key tables
+ const Font::Table* head_table = font->FindTable(kHeadTableTag);
+ if (head_table != NULL && head_table->length < 52) {
+ return FONT_COMPRESSION_FAILURE();
+ }
+
return true;
}
@@ -125,6 +123,9 @@ bool ReadCollectionFont(Buffer* file, const uint8_t* data, size_t len,
(*all_tables)[table.offset] = font->FindTable(table.tag);
} else {
table.reuse_of = (*all_tables)[table.offset];
+ if (table.tag != table.reuse_of->tag) {
+ return FONT_COMPRESSION_FAILURE();
+ }
}
}
@@ -325,8 +326,11 @@ int NumGlyphs(const Font& font) {
return 0;
}
int index_fmt = IndexFormat(font);
- int num_glyphs = (loca_table->length / (index_fmt == 0 ? 2 : 4)) - 1;
- return num_glyphs;
+ int loca_record_size = (index_fmt == 0 ? 2 : 4);
+ if (loca_table->length < loca_record_size) {
+ return 0;
+ }
+ return (loca_table->length / loca_record_size) - 1;
}
int IndexFormat(const Font& font) {