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 "sfntly/data/font_input_stream.h"
18
19#include <algorithm>
20
21namespace sfntly {
22
23FontInputStream::FontInputStream(InputStream* is)
24    : stream_(is), position_(0), length_(0), bounded_(false) {
25}
26
27FontInputStream::FontInputStream(InputStream* is, size_t length)
28    : stream_(is), position_(0), length_(length), bounded_(true) {
29}
30
31FontInputStream::~FontInputStream() {
32  // Do not close here, underlying InputStream will close themselves.
33}
34
35int32_t FontInputStream::Available() {
36  if (stream_) {
37    return stream_->Available();
38  }
39  return 0;
40}
41
42void FontInputStream::Close() {
43  if (stream_) {
44    stream_->Close();
45  }
46}
47
48void FontInputStream::Mark(int32_t readlimit) {
49  if (stream_) {
50    stream_->Mark(readlimit);
51  }
52}
53
54bool FontInputStream::MarkSupported() {
55  if (stream_) {
56    return stream_->MarkSupported();
57  }
58  return false;
59}
60
61void FontInputStream::Reset() {
62  if (stream_) {
63    stream_->Reset();
64  }
65}
66
67int32_t FontInputStream::Read() {
68  if (!stream_ || (bounded_ && position_ >= length_)) {
69    return -1;
70  }
71  int32_t b = stream_->Read();
72  if (b >= 0) {
73    position_++;
74  }
75  return b;
76}
77
78int32_t FontInputStream::Read(ByteVector* b, int32_t offset, int32_t length) {
79  if (!stream_ || offset < 0 || length < 0 ||
80      (bounded_ && position_ >= length_)) {
81    return -1;
82  }
83  int32_t bytes_to_read =
84      bounded_ ? std::min<int32_t>(length, (int32_t)(length_ - position_)) :
85                 length;
86  int32_t bytes_read = stream_->Read(b, offset, bytes_to_read);
87  position_ += bytes_read;
88  return bytes_read;
89}
90
91int32_t FontInputStream::Read(ByteVector* b) {
92  return Read(b, 0, b->size());
93}
94
95int32_t FontInputStream::ReadChar() {
96  return Read();
97}
98
99int32_t FontInputStream::ReadUShort() {
100  return 0xffff & (Read() << 8 | Read());
101}
102
103int32_t FontInputStream::ReadShort() {
104  return ((Read() << 8 | Read()) << 16) >> 16;
105}
106
107int32_t FontInputStream::ReadUInt24() {
108  return 0xffffff & (Read() << 16 | Read() << 8 | Read());
109}
110
111int64_t FontInputStream::ReadULong() {
112  return 0xffffffffL & ReadLong();
113}
114
115int32_t FontInputStream::ReadULongAsInt() {
116  int64_t ulong = ReadULong();
117  return ((int32_t)ulong) & ~0x80000000;
118}
119
120int32_t FontInputStream::ReadLong() {
121  return Read() << 24 | Read() << 16 | Read() << 8 | Read();
122}
123
124int32_t FontInputStream::ReadFixed() {
125  return ReadLong();
126}
127
128int64_t FontInputStream::ReadDateTimeAsLong() {
129  return (int64_t)ReadULong() << 32 | ReadULong();
130}
131
132int64_t FontInputStream::Skip(int64_t n) {
133  if (stream_) {
134    int64_t skipped = stream_->Skip(n);
135    position_ += skipped;
136    return skipped;
137  }
138  return 0;
139}
140
141}  // namespace sfntly
142