Repo created

TMessagesProj/jni/voip/webrtc/base/big_endian.cc

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+// Copyright 2014 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.
+
+#include "base/big_endian.h"
+
+#include "base/numerics/checked_math.h"
+#include "base/strings/string_piece.h"
+
+namespace base {
+
+BigEndianReader::BigEndianReader(const char* buf, size_t len)
+    : ptr_(buf), end_(ptr_ + len) {}
+
+bool BigEndianReader::Skip(size_t len) {
+  if (ptr_ + len > end_)
+    return false;
+  ptr_ += len;
+  return true;
+}
+
+bool BigEndianReader::ReadBytes(void* out, size_t len) {
+  if (ptr_ + len > end_)
+    return false;
+  memcpy(out, ptr_, len);
+  ptr_ += len;
+  return true;
+}
+
+bool BigEndianReader::ReadPiece(base::StringPiece* out, size_t len) {
+  if (ptr_ + len > end_)
+    return false;
+  *out = base::StringPiece(ptr_, len);
+  ptr_ += len;
+  return true;
+}
+
+template<typename T>
+bool BigEndianReader::Read(T* value) {
+  if (ptr_ + sizeof(T) > end_)
+    return false;
+  ReadBigEndian<T>(ptr_, value);
+  ptr_ += sizeof(T);
+  return true;
+}
+
+bool BigEndianReader::ReadU8(uint8_t* value) {
+  return Read(value);
+}
+
+bool BigEndianReader::ReadU16(uint16_t* value) {
+  return Read(value);
+}
+
+bool BigEndianReader::ReadU32(uint32_t* value) {
+  return Read(value);
+}
+
+bool BigEndianReader::ReadU64(uint64_t* value) {
+  return Read(value);
+}
+
+template <typename T>
+bool BigEndianReader::ReadLengthPrefixed(base::StringPiece* out) {
+  T t_len;
+  if (!Read(&t_len))
+    return false;
+  size_t len = strict_cast<size_t>(t_len);
+  const char* original_ptr = ptr_;
+  if (!Skip(len)) {
+    ptr_ -= sizeof(T);
+    return false;
+  }
+  *out = base::StringPiece(original_ptr, len);
+  return true;
+}
+
+bool BigEndianReader::ReadU8LengthPrefixed(base::StringPiece* out) {
+  return ReadLengthPrefixed<uint8_t>(out);
+}
+
+bool BigEndianReader::ReadU16LengthPrefixed(base::StringPiece* out) {
+  return ReadLengthPrefixed<uint16_t>(out);
+}
+
+BigEndianWriter::BigEndianWriter(char* buf, size_t len)
+    : ptr_(buf), end_(ptr_ + len) {}
+
+bool BigEndianWriter::Skip(size_t len) {
+  if (ptr_ + len > end_)
+    return false;
+  ptr_ += len;
+  return true;
+}
+
+bool BigEndianWriter::WriteBytes(const void* buf, size_t len) {
+  if (ptr_ + len > end_)
+    return false;
+  memcpy(ptr_, buf, len);
+  ptr_ += len;
+  return true;
+}
+
+template<typename T>
+bool BigEndianWriter::Write(T value) {
+  if (ptr_ + sizeof(T) > end_)
+    return false;
+  WriteBigEndian<T>(ptr_, value);
+  ptr_ += sizeof(T);
+  return true;
+}
+
+bool BigEndianWriter::WriteU8(uint8_t value) {
+  return Write(value);
+}
+
+bool BigEndianWriter::WriteU16(uint16_t value) {
+  return Write(value);
+}
+
+bool BigEndianWriter::WriteU32(uint32_t value) {
+  return Write(value);
+}
+
+bool BigEndianWriter::WriteU64(uint64_t value) {
+  return Write(value);
+}
+
+}  // namespace base