1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/big_endian.h"
6
7#include "base/strings/string_piece.h"
8
9namespace base {
10
11BigEndianReader::BigEndianReader(const char* buf, size_t len)
12    : ptr_(buf), end_(ptr_ + len) {}
13
14bool BigEndianReader::Skip(size_t len) {
15  if (ptr_ + len > end_)
16    return false;
17  ptr_ += len;
18  return true;
19}
20
21bool BigEndianReader::ReadBytes(void* out, size_t len) {
22  if (ptr_ + len > end_)
23    return false;
24  memcpy(out, ptr_, len);
25  ptr_ += len;
26  return true;
27}
28
29bool BigEndianReader::ReadPiece(base::StringPiece* out, size_t len) {
30  if (ptr_ + len > end_)
31    return false;
32  *out = base::StringPiece(ptr_, len);
33  ptr_ += len;
34  return true;
35}
36
37template<typename T>
38bool BigEndianReader::Read(T* value) {
39  if (ptr_ + sizeof(T) > end_)
40    return false;
41  ReadBigEndian<T>(ptr_, value);
42  ptr_ += sizeof(T);
43  return true;
44}
45
46bool BigEndianReader::ReadU8(uint8* value) {
47  return Read(value);
48}
49
50bool BigEndianReader::ReadU16(uint16* value) {
51  return Read(value);
52}
53
54bool BigEndianReader::ReadU32(uint32* value) {
55  return Read(value);
56}
57
58bool BigEndianReader::ReadU64(uint64* value) {
59  return Read(value);
60}
61
62BigEndianWriter::BigEndianWriter(char* buf, size_t len)
63    : ptr_(buf), end_(ptr_ + len) {}
64
65bool BigEndianWriter::Skip(size_t len) {
66  if (ptr_ + len > end_)
67    return false;
68  ptr_ += len;
69  return true;
70}
71
72bool BigEndianWriter::WriteBytes(const void* buf, size_t len) {
73  if (ptr_ + len > end_)
74    return false;
75  memcpy(ptr_, buf, len);
76  ptr_ += len;
77  return true;
78}
79
80template<typename T>
81bool BigEndianWriter::Write(T value) {
82  if (ptr_ + sizeof(T) > end_)
83    return false;
84  WriteBigEndian<T>(ptr_, value);
85  ptr_ += sizeof(T);
86  return true;
87}
88
89bool BigEndianWriter::WriteU8(uint8 value) {
90  return Write(value);
91}
92
93bool BigEndianWriter::WriteU16(uint16 value) {
94  return Write(value);
95}
96
97bool BigEndianWriter::WriteU32(uint32 value) {
98  return Write(value);
99}
100
101bool BigEndianWriter::WriteU64(uint64 value) {
102  return Write(value);
103}
104
105}  // namespace base
106