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// 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(STARBOARD)
#include "starboard/byte_swap.h"
#define ntohl(x) SB_NET_TO_HOST_U32(x)
#define ntohs(x) SB_NET_TO_HOST_U16(x)
#define htonl(x) SB_HOST_TO_NET_U32(x)
#define htons(x) SB_HOST_TO_NET_U16(x)
#elif defined(COBALT_WIN)
#elif 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> // for std::min
#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);
#if defined(COBALT_WIN)
#pragma warning(push)
#pragma warning(disable : 4267) // possible loss of data
#endif
chksum_buffer_offset_ += l;
#if defined(COBALT_WIN)
#pragma warning(pop)
#endif
offset += l;
length -= l;
}
if (chksum_buffer_offset_ == 4) {
uint32_t chksum;
std::memcpy(&chksum, chksum_buffer_, 4);
chksum_ += ntohl(chksum);
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);
#if defined(COBALT_WIN)
#pragma warning(push)
#pragma warning(disable : 4267) // possible loss of data
#elif defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wshorten-64-to-32"
#endif
chksum_buffer_offset_ = length;
#if defined(COBALT_WIN)
#pragma warning(pop)
#elif defined(__clang__)
#pragma clang diagnostic pop
#endif
}
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) {
#if defined(COBALT_WIN)
#pragma warning(push)
#pragma warning(disable : 4365) // signed/unsigned mismatch
#endif
v = htons(v);
#if defined(COBALT_WIN)
#pragma warning(pop)
#endif
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) {
#if defined(COBALT_WIN)
#pragma warning(push)
#pragma warning(disable : 4365) // signed/unsigned mismatch
#endif
v = htonl(v);
#if defined(COBALT_WIN)
#pragma warning(pop)
#endif
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 Process(OTSStream *output, const uint8_t *input, size_t length);
// Force to disable debug output even when the library is compiled with
// -DOTS_DEBUG.
void DisableDebugOutput();
} // namespace ots
#endif // OPENTYPE_SANITISER_H_