byte_array.cc revision 95efcd4ba41e367b466b7206a942605bbbbb2c90 
1/*
2 * Copyright 2011 Google Inc. All Rights Reserved.
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 <algorithm>
18
19#include "sfntly/data/byte_array.h"
20#include "sfntly/port/exception_type.h"
21
22namespace sfntly {
23
24const int32_t ByteArray::COPY_BUFFER_SIZE = 8192;
25
26void ByteArray::init(int32_t filled_length, int32_t storage_length,
27                     bool growable) {
28  storage_length_ = storage_length;
29  growable_ = growable;
30  setFilledLength(filled_length);
31}
32
33ByteArray::ByteArray(int32_t filled_length, int32_t storage_length,
34                     bool growable) {
35  init(filled_length, storage_length, growable);
36}
37
38ByteArray::ByteArray(int32_t filled_length, int32_t storage_length) {
39  init(filled_length, storage_length, false);
40}
41
42ByteArray::~ByteArray() {}
43
44int32_t ByteArray::length() { return filled_length_; }
45int32_t ByteArray::size() { return storage_length_; }
46bool ByteArray::growable() { return growable_; }
47
48int32_t ByteArray::setFilledLength(int32_t filled_length) {
49  filled_length_ = std::min<int32_t>(filled_length, storage_length_);
50  return filled_length_;
51}
52
53byte_t ByteArray::get(int32_t index) {
54  return internalGet(index);
55}
56
57int32_t ByteArray::get(int32_t index, ByteVector* b) {
58  assert(b);
59  return get(index, b, 0, b->size());
60}
61
62int32_t ByteArray::get(int32_t index, ByteVector* b, int32_t offset,
63                       int32_t length) {
64  assert(b);
65  if (index < 0 || index >= filled_length_) {
66    return -1;
67  }
68  int32_t actual_length = std::min<int32_t>(length, filled_length_ - index);
69  if (actual_length < 0) {
70      return -1;
71  }
72  return internalGet(index, b, offset, actual_length);
73}
74
75bool ByteArray::put(int32_t index, byte_t b) {
76  if (index < 0 || index >= size()) {
77    return false;
78  }
79  bool result = internalPut(index, b);
80  filled_length_ = std::max<int32_t>(filled_length_, index + 1);
81  return result;
82}
83
84int32_t ByteArray::put(int index, ByteVector* b) {
85  assert(b);
86  return put(index, b, 0, b->size());
87}
88
89int32_t ByteArray::put(int32_t index, ByteVector* b, int32_t offset,
90                       int32_t length) {
91  assert(b);
92  if (index < 0 || index >= size()) {
93    return 0;
94  }
95  int32_t actual_length = std::min<int32_t>(length, size() - index);
96  int32_t bytes_written = internalPut(index, b, offset, actual_length);
97  filled_length_ = std::max<int32_t>(filled_length_, index + bytes_written);
98  return bytes_written;
99}
100
101int32_t ByteArray::copyTo(ByteArray* array) {
102  return copyTo(array, 0, length());
103}
104
105int32_t ByteArray::copyTo(ByteArray* array, int32_t offset, int32_t length) {
106  return copyTo(0, array, offset, length);
107}
108
109int32_t ByteArray::copyTo(int32_t dst_offset, ByteArray* array,
110                          int32_t src_offset, int32_t length) {
111  assert(array);
112  if (array->size() < dst_offset + length) {  // insufficient space
113    return -1;
114  }
115
116  ByteVector b(COPY_BUFFER_SIZE);
117  int32_t bytes_read = 0;
118  int32_t index = 0;
119  int32_t remaining_length = length;
120  int32_t buffer_length = std::min<int32_t>(COPY_BUFFER_SIZE, length);
121  while ((bytes_read = get(index + src_offset, &b, 0, buffer_length)) > 0) {
122    int bytes_written = array->put(index + dst_offset, &b, 0, bytes_read);
123    if (bytes_written != bytes_read) {
124      throw IOException("Error writing bytes.");
125    }
126    index += bytes_read;
127    remaining_length -= bytes_read;
128    buffer_length = std::min<int32_t>(b.size(), remaining_length);
129  }
130  return index;
131}
132
133int32_t ByteArray::copyTo(OutputStream* os) {
134    return copyTo(os, 0, length());
135}
136
137int32_t ByteArray::copyTo(OutputStream* os, int32_t offset, int32_t length) {
138  ByteVector b(COPY_BUFFER_SIZE);
139  int32_t bytes_read = 0;
140  int32_t index = offset;
141  int32_t buffer_length = std::min<int32_t>(COPY_BUFFER_SIZE, length);
142  while ((bytes_read = get(index, &b, 0, buffer_length)) > 0) {
143    os->write(&b, 0, bytes_read);
144    index += bytes_read;
145    buffer_length = std::min<int32_t>(b.size(), length - index);
146  }
147  return index;
148}
149
150bool ByteArray::copyFrom(InputStream* is, int32_t length) {
151  ByteVector b(COPY_BUFFER_SIZE);
152  int32_t bytes_read = 0;
153  int32_t index = 0;
154  int32_t buffer_length = std::min<int32_t>(COPY_BUFFER_SIZE, length);
155  while ((bytes_read =
156          is->read(&b, 0, buffer_length)) > 0) {
157    if (put(index, &b, 0, bytes_read) != bytes_read) {
158      throw IOException("Error writing bytes.");
159    }
160    index += bytes_read;
161    length -= bytes_read;
162    buffer_length = std::min<int32_t>(b.size(), length);
163  }
164  return true;
165}
166
167bool ByteArray::copyFrom(InputStream* is) {
168  ByteVector b(COPY_BUFFER_SIZE);
169  int32_t bytes_read = 0;
170  int32_t index = 0;
171  int32_t buffer_length = COPY_BUFFER_SIZE;
172  while ((bytes_read =
173          is->read(&b, 0, buffer_length)) > 0) {
174    if (put(index, &b, 0, bytes_read) != bytes_read) {
175      throw IOException("Error writing bytes.");
176    }
177    index += bytes_read;
178  }
179  return true;
180}
181
182}  // namespace sfntly
183