1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/*
* Copyright 2011 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if defined (WIN32)
#include <windows.h>
#endif
#include <algorithm>
#include "sfntly/port/file_input_stream.h"
#include "sfntly/port/exception_type.h"
namespace sfntly {
FileInputStream::FileInputStream()
: file_(NULL),
position_(0),
length_(0) {
}
FileInputStream::~FileInputStream() {
Close();
}
int32_t FileInputStream::Available() {
return length_ - position_;
}
void FileInputStream::Close() {
if (file_) {
fclose(file_);
length_ = 0;
position_ = 0;
file_ = NULL;
}
}
void FileInputStream::Mark(int32_t readlimit) {
// NOP
UNREFERENCED_PARAMETER(readlimit);
}
bool FileInputStream::MarkSupported() {
return false;
}
int32_t FileInputStream::Read() {
if (!file_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IOException("no opened file");
#endif
return 0;
}
if (feof(file_)) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IOException("eof reached");
#endif
return 0;
}
byte_t value;
size_t length = fread(&value, 1, 1, file_);
position_ += length;
return value;
}
int32_t FileInputStream::Read(ByteVector* b) {
return Read(b, 0, b->size());
}
int32_t FileInputStream::Read(ByteVector* b, int32_t offset, int32_t length) {
assert(b);
if (!file_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IOException("no opened file");
#endif
return 0;
}
if (feof(file_)) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IOException("eof reached");
#endif
return 0;
}
size_t read_count = std::min<size_t>(length_ - position_, length);
if (b->size() < (size_t)(offset + read_count)) {
b->resize((size_t)(offset + read_count));
}
int32_t actual_read = fread(&((*b)[offset]), 1, read_count, file_);
position_ += actual_read;
return actual_read;
}
void FileInputStream::Reset() {
// NOP
}
int64_t FileInputStream::Skip(int64_t n) {
if (!file_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IOException("no opened file");
#endif
return 0;
}
int64_t skip_count = 0;
if (n < 0) { // move backwards
skip_count = std::max<int64_t>(0 - (int64_t)position_, n);
position_ -= (size_t)(0 - skip_count);
fseek(file_, position_, SEEK_SET);
} else {
skip_count = std::min<size_t>(length_ - position_, (size_t)n);
position_ += (size_t)skip_count;
fseek(file_, (size_t)skip_count, SEEK_CUR);
}
return skip_count;
}
void FileInputStream::Unread(ByteVector* b) {
Unread(b, 0, b->size());
}
void FileInputStream::Unread(ByteVector* b, int32_t offset, int32_t length) {
assert(b);
assert(b->size() >= size_t(offset + length));
if (!file_) {
#if !defined (SFNTLY_NO_EXCEPTION)
throw IOException("no opened file");
#endif
return;
}
size_t unread_count = std::min<size_t>(position_, length);
fseek(file_, position_ - unread_count, SEEK_SET);
position_ -= unread_count;
Read(b, offset, length);
fseek(file_, position_ - unread_count, SEEK_SET);
position_ -= unread_count;
}
bool FileInputStream::Open(const char* file_path) {
assert(file_path);
if (file_) {
Close();
}
#if defined (WIN32)
fopen_s(&file_, file_path, "rb");
#else
file_ = fopen(file_path, "rb");
#endif
if (file_ == NULL) {
return false;
}
fseek(file_, 0, SEEK_END);
length_ = ftell(file_);
fseek(file_, 0, SEEK_SET);
return true;
}
} // namespace sfntly
|
