The Tor Browser: comparison gfx/ots/include/opentype-sanitiser.h

--1:000000000000
+:0b8f7e5dfe1c
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+#ifndef OPENTYPE_SANITISER_H_
+#define OPENTYPE_SANITISER_H_
+#if defined(_WIN32) || defined(__CYGWIN__)
+#define OTS_DLL_IMPORT __declspec(dllimport)
+#define OTS_DLL_EXPORT __declspec(dllexport)
+#else
+#if __GNUC__ >= 4
+#define OTS_DLL_IMPORT __attribute__((visibility ("default")))
+#define OTS_DLL_EXPORT __attribute__((visibility ("default")))
+#endif
+#endif
+#ifdef OTS_DLL
+#ifdef OTS_DLL_EXPORTS
+#define OTS_API OTS_DLL_EXPORT
+#else
+#define OTS_API OTS_DLL_IMPORT
+#endif
+#else
+#define OTS_API
+#endif
+#if defined(_WIN32)
+#include <stdlib.h>
+typedef signed char int8_t;
+typedef unsigned char uint8_t;
+typedef short int16_t;
+typedef unsigned short uint16_t;
+typedef int int32_t;
+typedef unsigned int uint32_t;
+typedef __int64 int64_t;
+typedef unsigned __int64 uint64_t;
+#define ntohl(x) _byteswap_ulong (x)
+#define ntohs(x) _byteswap_ushort (x)
+#define htonl(x) _byteswap_ulong (x)
+#define htons(x) _byteswap_ushort (x)
+#else
+#include <arpa/inet.h>
+#include <stdint.h>
+#endif
+#include <algorithm>
+#include <cassert>
+#include <cstddef>
+#include <cstring>
+namespace ots {
+// -----------------------------------------------------------------------------
+// This is an interface for an abstract stream class which is used for writing
+// the serialised results out.
+// -----------------------------------------------------------------------------
+class OTSStream {
+public:
+OTSStream() {
+ResetChecksum();
+}
+virtual ~OTSStream() {}
+// This should be implemented to perform the actual write.
+virtual bool WriteRaw(const void *data, size_t length) = 0;
+bool Write(const void *data, size_t length) {
+if (!length) return false;
+const size_t orig_length = length;
+size_t offset = 0;
+if (chksum_buffer_offset_) {
+const size_t l =
+std::min(length, static_cast<size_t>(4) - chksum_buffer_offset_);
+std::memcpy(chksum_buffer_ + chksum_buffer_offset_, data, l);
+chksum_buffer_offset_ += l;
+offset += l;
+length -= l;
+}
+if (chksum_buffer_offset_ == 4) {
+uint32_t tmp;
+std::memcpy(&tmp, chksum_buffer_, 4);
+chksum_ += ntohl(tmp);
+chksum_buffer_offset_ = 0;
+}
+while (length >= 4) {
+uint32_t tmp;
+std::memcpy(&tmp, reinterpret_cast<const uint8_t *>(data) + offset,
+sizeof(uint32_t));
+chksum_ += ntohl(tmp);
+length -= 4;
+offset += 4;
+}
+if (length) {
+if (chksum_buffer_offset_ != 0) return false;  // not reached
+if (length > 4) return false;  // not reached
+std::memcpy(chksum_buffer_,
+reinterpret_cast<const uint8_t*>(data) + offset, length);
+chksum_buffer_offset_ = length;
+}
+return WriteRaw(data, orig_length);
+}
+virtual bool Seek(off_t position) = 0;
+virtual off_t Tell() const = 0;
+virtual bool Pad(size_t bytes) {
+static const uint32_t kZero = 0;
+while (bytes >= 4) {
+if (!WriteTag(kZero)) return false;
+bytes -= 4;
+}
+while (bytes) {
+static const uint8_t kZerob = 0;
+if (!Write(&kZerob, 1)) return false;
+bytes--;
+}
+return true;
+}
+bool WriteU8(uint8_t v) {
+return Write(&v, sizeof(v));
+}
+bool WriteU16(uint16_t v) {
+v = htons(v);
+return Write(&v, sizeof(v));
+}
+bool WriteS16(int16_t v) {
+v = htons(v);
+return Write(&v, sizeof(v));
+}
+bool WriteU24(uint32_t v) {
+v = htonl(v);
+return Write(reinterpret_cast<uint8_t*>(&v)+1, 3);
+}
+bool WriteU32(uint32_t v) {
+v = htonl(v);
+return Write(&v, sizeof(v));
+}
+bool WriteS32(int32_t v) {
+v = htonl(v);
+return Write(&v, sizeof(v));
+}
+bool WriteR64(uint64_t v) {
+return Write(&v, sizeof(v));
+}
+bool WriteTag(uint32_t v) {
+return Write(&v, sizeof(v));
+}
+void ResetChecksum() {
+chksum_ = 0;
+chksum_buffer_offset_ = 0;
+}
+uint32_t chksum() const {
+assert(chksum_buffer_offset_ == 0);
+return chksum_;
+}
+struct ChecksumState {
+uint32_t chksum;
+uint8_t chksum_buffer[4];
+unsigned chksum_buffer_offset;
+};
+ChecksumState SaveChecksumState() const {
+ChecksumState s;
+s.chksum = chksum_;
+s.chksum_buffer_offset = chksum_buffer_offset_;
+std::memcpy(s.chksum_buffer, chksum_buffer_, 4);
+return s;
+}
+void RestoreChecksum(const ChecksumState &s) {
+assert(chksum_buffer_offset_ == 0);
+chksum_ += s.chksum;
+chksum_buffer_offset_ = s.chksum_buffer_offset;
+std::memcpy(chksum_buffer_, s.chksum_buffer, 4);
+}
+protected:
+uint32_t chksum_;
+uint8_t chksum_buffer_[4];
+unsigned chksum_buffer_offset_;
+};
+// -----------------------------------------------------------------------------
+// Process a given OpenType file and write out a sanitised version
+//   output: a pointer to an object implementing the OTSStream interface. The
+//     sanitisied output will be written to this. In the even of a failure,
+//     partial output may have been written.
+//   input: the OpenType file
+//   length: the size, in bytes, of |input|
+// -----------------------------------------------------------------------------
+bool OTS_API Process(OTSStream *output, const uint8_t *input, size_t length);
+// Signature of the function to be provided by the client in order to report errors.
+// The return type is a boolean so that it can be used within an expression,
+// but the actual value is ignored. (Suggested convention is to always return 'false'.)
+#ifdef __GCC__
+#define MSGFUNC_FMT_ATTR __attribute__((format(printf, 2, 3)))
+#else
+#define MSGFUNC_FMT_ATTR
+#endif
+typedef bool (*MessageFunc)(void *user_data, const char *format, ...)  MSGFUNC_FMT_ATTR;
+// Set a callback function that will be called when OTS is reporting an error.
+void OTS_API SetMessageCallback(MessageFunc func, void *user_data);
+enum TableAction {
+TABLE_ACTION_DEFAULT,  // Use OTS's default action for that table
+TABLE_ACTION_SANITIZE, // Sanitize the table, potentially droping it
+TABLE_ACTION_PASSTHRU, // Serialize the table unchanged
+TABLE_ACTION_DROP      // Drop the table
+};
+// Signature of the function to be provided by the client to decide what action
+// to do for a given table.
+typedef TableAction (*TableActionFunc)(uint32_t tag, void *user_data);
+// Set a callback function that will be called when OTS needs to decide what to
+// do for a font table.
+void OTS_API SetTableActionCallback(TableActionFunc func, void *user_data);
+// Force to disable debug output even when the library is compiled with
+// -DOTS_DEBUG.
+void DisableDebugOutput();
+#ifdef MOZ_OTS_WOFF2
+// Enable WOFF2 support(experimental).
+void EnableWOFF2();
+#endif
+}  // namespace ots
+#endif  // OPENTYPE_SANITISER_H_

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comparison: gfx/ots/include/opentype-sanitiser.h

gfx/ots/include/opentype-sanitiser.h