From 9daf1655d7e4eaaa6ed5f44055a4b4fd399fd25c Mon Sep 17 00:00:00 2001 From: Konstantin Tokarev Date: Wed, 28 Sep 2016 16:39:37 +0300 Subject: Imported WebKit commit eb954cdcf58f9b915b2fcb6f8e4cb3a60650a4f3 Change-Id: I8dda875c38075d43b76fe3a21acb0ffa102bb82d Reviewed-by: Konstantin Tokarev --- Source/ThirdParty/woff2/src/woff2_common.cc | 53 +++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 Source/ThirdParty/woff2/src/woff2_common.cc (limited to 'Source/ThirdParty/woff2/src/woff2_common.cc') diff --git a/Source/ThirdParty/woff2/src/woff2_common.cc b/Source/ThirdParty/woff2/src/woff2_common.cc new file mode 100644 index 000000000..39dc54e6f --- /dev/null +++ b/Source/ThirdParty/woff2/src/woff2_common.cc @@ -0,0 +1,53 @@ +// 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. +// +// Helpers common across multiple parts of woff2 + +#include + +#include "./woff2_common.h" + +namespace woff2 { + + +uint32_t ComputeULongSum(const uint8_t* buf, size_t size) { + uint32_t checksum = 0; + for (size_t i = 0; i < size; i += 4) { +#if (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)) + uint32_t v = *reinterpret_cast(buf + i); + checksum += (((v & 0xFF) << 24) | ((v & 0xFF00) << 8) | + ((v & 0xFF0000) >> 8) | ((v & 0xFF000000) >> 24)); +#elif (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)) + checksum += *reinterpret_cast(buf + i); +#else + checksum += (buf[i] << 24) | (buf[i + 1] << 16) | + (buf[i + 2] << 8) | buf[i + 3]; +#endif + } + return checksum; +} + +size_t CollectionHeaderSize(uint32_t header_version, uint32_t num_fonts) { + size_t size = 0; + if (header_version == 0x00020000) { + size += 12; // ulDsig{Tag,Length,Offset} + } + if (header_version == 0x00010000 || header_version == 0x00020000) { + size += 12 // TTCTag, Version, numFonts + + 4 * num_fonts; // OffsetTable[numFonts] + } + return size; +} + +} // namespace woff2 -- cgit v1.2.3