1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/ots/include/opentype-sanitiser.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,251 @@
1.4 +// Copyright (c) 2009 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#ifndef OPENTYPE_SANITISER_H_
1.9 +#define OPENTYPE_SANITISER_H_
1.10 +
1.11 +#if defined(_WIN32) || defined(__CYGWIN__)
1.12 + #define OTS_DLL_IMPORT __declspec(dllimport)
1.13 + #define OTS_DLL_EXPORT __declspec(dllexport)
1.14 +#else
1.15 + #if __GNUC__ >= 4
1.16 + #define OTS_DLL_IMPORT __attribute__((visibility ("default")))
1.17 + #define OTS_DLL_EXPORT __attribute__((visibility ("default")))
1.18 + #endif
1.19 +#endif
1.20 +
1.21 +#ifdef OTS_DLL
1.22 + #ifdef OTS_DLL_EXPORTS
1.23 + #define OTS_API OTS_DLL_EXPORT
1.24 + #else
1.25 + #define OTS_API OTS_DLL_IMPORT
1.26 + #endif
1.27 +#else
1.28 + #define OTS_API
1.29 +#endif
1.30 +
1.31 +#if defined(_WIN32)
1.32 +#include <stdlib.h>
1.33 +typedef signed char int8_t;
1.34 +typedef unsigned char uint8_t;
1.35 +typedef short int16_t;
1.36 +typedef unsigned short uint16_t;
1.37 +typedef int int32_t;
1.38 +typedef unsigned int uint32_t;
1.39 +typedef __int64 int64_t;
1.40 +typedef unsigned __int64 uint64_t;
1.41 +#define ntohl(x) _byteswap_ulong (x)
1.42 +#define ntohs(x) _byteswap_ushort (x)
1.43 +#define htonl(x) _byteswap_ulong (x)
1.44 +#define htons(x) _byteswap_ushort (x)
1.45 +#else
1.46 +#include <arpa/inet.h>
1.47 +#include <stdint.h>
1.48 +#endif
1.49 +
1.50 +#include <algorithm>
1.51 +#include <cassert>
1.52 +#include <cstddef>
1.53 +#include <cstring>
1.54 +
1.55 +namespace ots {
1.56 +
1.57 +// -----------------------------------------------------------------------------
1.58 +// This is an interface for an abstract stream class which is used for writing
1.59 +// the serialised results out.
1.60 +// -----------------------------------------------------------------------------
1.61 +class OTSStream {
1.62 + public:
1.63 + OTSStream() {
1.64 + ResetChecksum();
1.65 + }
1.66 +
1.67 + virtual ~OTSStream() {}
1.68 +
1.69 + // This should be implemented to perform the actual write.
1.70 + virtual bool WriteRaw(const void *data, size_t length) = 0;
1.71 +
1.72 + bool Write(const void *data, size_t length) {
1.73 + if (!length) return false;
1.74 +
1.75 + const size_t orig_length = length;
1.76 + size_t offset = 0;
1.77 + if (chksum_buffer_offset_) {
1.78 + const size_t l =
1.79 + std::min(length, static_cast<size_t>(4) - chksum_buffer_offset_);
1.80 + std::memcpy(chksum_buffer_ + chksum_buffer_offset_, data, l);
1.81 + chksum_buffer_offset_ += l;
1.82 + offset += l;
1.83 + length -= l;
1.84 + }
1.85 +
1.86 + if (chksum_buffer_offset_ == 4) {
1.87 + uint32_t tmp;
1.88 + std::memcpy(&tmp, chksum_buffer_, 4);
1.89 + chksum_ += ntohl(tmp);
1.90 + chksum_buffer_offset_ = 0;
1.91 + }
1.92 +
1.93 + while (length >= 4) {
1.94 + uint32_t tmp;
1.95 + std::memcpy(&tmp, reinterpret_cast<const uint8_t *>(data) + offset,
1.96 + sizeof(uint32_t));
1.97 + chksum_ += ntohl(tmp);
1.98 + length -= 4;
1.99 + offset += 4;
1.100 + }
1.101 +
1.102 + if (length) {
1.103 + if (chksum_buffer_offset_ != 0) return false; // not reached
1.104 + if (length > 4) return false; // not reached
1.105 + std::memcpy(chksum_buffer_,
1.106 + reinterpret_cast<const uint8_t*>(data) + offset, length);
1.107 + chksum_buffer_offset_ = length;
1.108 + }
1.109 +
1.110 + return WriteRaw(data, orig_length);
1.111 + }
1.112 +
1.113 + virtual bool Seek(off_t position) = 0;
1.114 + virtual off_t Tell() const = 0;
1.115 +
1.116 + virtual bool Pad(size_t bytes) {
1.117 + static const uint32_t kZero = 0;
1.118 + while (bytes >= 4) {
1.119 + if (!WriteTag(kZero)) return false;
1.120 + bytes -= 4;
1.121 + }
1.122 + while (bytes) {
1.123 + static const uint8_t kZerob = 0;
1.124 + if (!Write(&kZerob, 1)) return false;
1.125 + bytes--;
1.126 + }
1.127 + return true;
1.128 + }
1.129 +
1.130 + bool WriteU8(uint8_t v) {
1.131 + return Write(&v, sizeof(v));
1.132 + }
1.133 +
1.134 + bool WriteU16(uint16_t v) {
1.135 + v = htons(v);
1.136 + return Write(&v, sizeof(v));
1.137 + }
1.138 +
1.139 + bool WriteS16(int16_t v) {
1.140 + v = htons(v);
1.141 + return Write(&v, sizeof(v));
1.142 + }
1.143 +
1.144 + bool WriteU24(uint32_t v) {
1.145 + v = htonl(v);
1.146 + return Write(reinterpret_cast<uint8_t*>(&v)+1, 3);
1.147 + }
1.148 +
1.149 + bool WriteU32(uint32_t v) {
1.150 + v = htonl(v);
1.151 + return Write(&v, sizeof(v));
1.152 + }
1.153 +
1.154 + bool WriteS32(int32_t v) {
1.155 + v = htonl(v);
1.156 + return Write(&v, sizeof(v));
1.157 + }
1.158 +
1.159 + bool WriteR64(uint64_t v) {
1.160 + return Write(&v, sizeof(v));
1.161 + }
1.162 +
1.163 + bool WriteTag(uint32_t v) {
1.164 + return Write(&v, sizeof(v));
1.165 + }
1.166 +
1.167 + void ResetChecksum() {
1.168 + chksum_ = 0;
1.169 + chksum_buffer_offset_ = 0;
1.170 + }
1.171 +
1.172 + uint32_t chksum() const {
1.173 + assert(chksum_buffer_offset_ == 0);
1.174 + return chksum_;
1.175 + }
1.176 +
1.177 + struct ChecksumState {
1.178 + uint32_t chksum;
1.179 + uint8_t chksum_buffer[4];
1.180 + unsigned chksum_buffer_offset;
1.181 + };
1.182 +
1.183 + ChecksumState SaveChecksumState() const {
1.184 + ChecksumState s;
1.185 + s.chksum = chksum_;
1.186 + s.chksum_buffer_offset = chksum_buffer_offset_;
1.187 + std::memcpy(s.chksum_buffer, chksum_buffer_, 4);
1.188 +
1.189 + return s;
1.190 + }
1.191 +
1.192 + void RestoreChecksum(const ChecksumState &s) {
1.193 + assert(chksum_buffer_offset_ == 0);
1.194 + chksum_ += s.chksum;
1.195 + chksum_buffer_offset_ = s.chksum_buffer_offset;
1.196 + std::memcpy(chksum_buffer_, s.chksum_buffer, 4);
1.197 + }
1.198 +
1.199 + protected:
1.200 + uint32_t chksum_;
1.201 + uint8_t chksum_buffer_[4];
1.202 + unsigned chksum_buffer_offset_;
1.203 +};
1.204 +
1.205 +// -----------------------------------------------------------------------------
1.206 +// Process a given OpenType file and write out a sanitised version
1.207 +// output: a pointer to an object implementing the OTSStream interface. The
1.208 +// sanitisied output will be written to this. In the even of a failure,
1.209 +// partial output may have been written.
1.210 +// input: the OpenType file
1.211 +// length: the size, in bytes, of |input|
1.212 +// -----------------------------------------------------------------------------
1.213 +bool OTS_API Process(OTSStream *output, const uint8_t *input, size_t length);
1.214 +
1.215 +// Signature of the function to be provided by the client in order to report errors.
1.216 +// The return type is a boolean so that it can be used within an expression,
1.217 +// but the actual value is ignored. (Suggested convention is to always return 'false'.)
1.218 +#ifdef __GCC__
1.219 +#define MSGFUNC_FMT_ATTR __attribute__((format(printf, 2, 3)))
1.220 +#else
1.221 +#define MSGFUNC_FMT_ATTR
1.222 +#endif
1.223 +typedef bool (*MessageFunc)(void *user_data, const char *format, ...) MSGFUNC_FMT_ATTR;
1.224 +
1.225 +// Set a callback function that will be called when OTS is reporting an error.
1.226 +void OTS_API SetMessageCallback(MessageFunc func, void *user_data);
1.227 +
1.228 +enum TableAction {
1.229 + TABLE_ACTION_DEFAULT, // Use OTS's default action for that table
1.230 + TABLE_ACTION_SANITIZE, // Sanitize the table, potentially droping it
1.231 + TABLE_ACTION_PASSTHRU, // Serialize the table unchanged
1.232 + TABLE_ACTION_DROP // Drop the table
1.233 +};
1.234 +
1.235 +// Signature of the function to be provided by the client to decide what action
1.236 +// to do for a given table.
1.237 +typedef TableAction (*TableActionFunc)(uint32_t tag, void *user_data);
1.238 +
1.239 +// Set a callback function that will be called when OTS needs to decide what to
1.240 +// do for a font table.
1.241 +void OTS_API SetTableActionCallback(TableActionFunc func, void *user_data);
1.242 +
1.243 +// Force to disable debug output even when the library is compiled with
1.244 +// -DOTS_DEBUG.
1.245 +void DisableDebugOutput();
1.246 +
1.247 +#ifdef MOZ_OTS_WOFF2
1.248 +// Enable WOFF2 support(experimental).
1.249 +void EnableWOFF2();
1.250 +#endif
1.251 +
1.252 +} // namespace ots
1.253 +
1.254 +#endif // OPENTYPE_SANITISER_H_
