1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "io/BigBufferStream.h"
18
19namespace aapt {
20namespace io {
21
22//
23// BigBufferInputStream
24//
25
26bool BigBufferInputStream::Next(const void** data, size_t* size) {
27  if (iter_ == buffer_->end()) {
28    return false;
29  }
30
31  if (offset_ == iter_->size) {
32    ++iter_;
33    if (iter_ == buffer_->end()) {
34      return false;
35    }
36    offset_ = 0;
37  }
38
39  *data = iter_->buffer.get() + offset_;
40  *size = iter_->size - offset_;
41  bytes_read_ += iter_->size - offset_;
42  offset_ = iter_->size;
43  return true;
44}
45
46void BigBufferInputStream::BackUp(size_t count) {
47  if (count > offset_) {
48    bytes_read_ -= offset_;
49    offset_ = 0;
50  } else {
51    offset_ -= count;
52    bytes_read_ -= count;
53  }
54}
55
56bool BigBufferInputStream::CanRewind() const {
57  return true;
58}
59
60bool BigBufferInputStream::Rewind() {
61  iter_ = buffer_->begin();
62  offset_ = 0;
63  bytes_read_ = 0;
64  return true;
65}
66
67size_t BigBufferInputStream::ByteCount() const {
68  return bytes_read_;
69}
70
71bool BigBufferInputStream::HadError() const {
72  return false;
73}
74
75size_t BigBufferInputStream::TotalSize() const {
76  return buffer_->size();
77}
78
79//
80// BigBufferOutputStream
81//
82
83bool BigBufferOutputStream::Next(void** data, size_t* size) {
84  *data = buffer_->NextBlock(size);
85  return true;
86}
87
88void BigBufferOutputStream::BackUp(size_t count) {
89  buffer_->BackUp(count);
90}
91
92size_t BigBufferOutputStream::ByteCount() const {
93  return buffer_->size();
94}
95
96bool BigBufferOutputStream::HadError() const {
97  return false;
98}
99
100}  // namespace io
101}  // namespace aapt
102