Selim Gurun | 30d4e1f | 2013-08-15 12:46:15 -0700 | [diff] [blame] | 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 | #if defined (WIN32) |
| 18 | #include <windows.h> |
| 19 | #endif |
| 20 | |
Colin Cross | 13a8243 | 2017-04-07 10:50:33 -0700 | [diff] [blame] | 21 | #include <algorithm> |
| 22 | |
Selim Gurun | 30d4e1f | 2013-08-15 12:46:15 -0700 | [diff] [blame] | 23 | #include "sfntly/port/file_input_stream.h" |
| 24 | #include "sfntly/port/exception_type.h" |
| 25 | |
| 26 | namespace sfntly { |
| 27 | |
| 28 | FileInputStream::FileInputStream() |
| 29 | : file_(NULL), |
| 30 | position_(0), |
| 31 | length_(0) { |
| 32 | } |
| 33 | |
| 34 | FileInputStream::~FileInputStream() { |
| 35 | Close(); |
| 36 | } |
| 37 | |
| 38 | int32_t FileInputStream::Available() { |
| 39 | return length_ - position_; |
| 40 | } |
| 41 | |
| 42 | void FileInputStream::Close() { |
| 43 | if (file_) { |
| 44 | fclose(file_); |
| 45 | length_ = 0; |
| 46 | position_ = 0; |
| 47 | file_ = NULL; |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | void FileInputStream::Mark(int32_t readlimit) { |
| 52 | // NOP |
| 53 | UNREFERENCED_PARAMETER(readlimit); |
| 54 | } |
| 55 | |
| 56 | bool FileInputStream::MarkSupported() { |
| 57 | return false; |
| 58 | } |
| 59 | |
| 60 | int32_t FileInputStream::Read() { |
| 61 | if (!file_) { |
| 62 | #if !defined (SFNTLY_NO_EXCEPTION) |
| 63 | throw IOException("no opened file"); |
| 64 | #endif |
| 65 | return 0; |
| 66 | } |
| 67 | if (feof(file_)) { |
| 68 | #if !defined (SFNTLY_NO_EXCEPTION) |
| 69 | throw IOException("eof reached"); |
| 70 | #endif |
| 71 | return 0; |
| 72 | } |
| 73 | byte_t value; |
| 74 | size_t length = fread(&value, 1, 1, file_); |
| 75 | position_ += length; |
| 76 | return value; |
| 77 | } |
| 78 | |
| 79 | int32_t FileInputStream::Read(ByteVector* b) { |
| 80 | return Read(b, 0, b->size()); |
| 81 | } |
| 82 | |
| 83 | int32_t FileInputStream::Read(ByteVector* b, int32_t offset, int32_t length) { |
| 84 | assert(b); |
| 85 | if (!file_) { |
| 86 | #if !defined (SFNTLY_NO_EXCEPTION) |
| 87 | throw IOException("no opened file"); |
| 88 | #endif |
| 89 | return 0; |
| 90 | } |
| 91 | if (feof(file_)) { |
| 92 | #if !defined (SFNTLY_NO_EXCEPTION) |
| 93 | throw IOException("eof reached"); |
| 94 | #endif |
| 95 | return 0; |
| 96 | } |
| 97 | size_t read_count = std::min<size_t>(length_ - position_, length); |
| 98 | if (b->size() < (size_t)(offset + read_count)) { |
| 99 | b->resize((size_t)(offset + read_count)); |
| 100 | } |
| 101 | int32_t actual_read = fread(&((*b)[offset]), 1, read_count, file_); |
| 102 | position_ += actual_read; |
| 103 | return actual_read; |
| 104 | } |
| 105 | |
| 106 | void FileInputStream::Reset() { |
| 107 | // NOP |
| 108 | } |
| 109 | |
| 110 | int64_t FileInputStream::Skip(int64_t n) { |
| 111 | if (!file_) { |
| 112 | #if !defined (SFNTLY_NO_EXCEPTION) |
| 113 | throw IOException("no opened file"); |
| 114 | #endif |
| 115 | return 0; |
| 116 | } |
| 117 | int64_t skip_count = 0; |
| 118 | if (n < 0) { // move backwards |
| 119 | skip_count = std::max<int64_t>(0 - (int64_t)position_, n); |
| 120 | position_ -= (size_t)(0 - skip_count); |
| 121 | fseek(file_, position_, SEEK_SET); |
| 122 | } else { |
| 123 | skip_count = std::min<size_t>(length_ - position_, (size_t)n); |
| 124 | position_ += (size_t)skip_count; |
| 125 | fseek(file_, (size_t)skip_count, SEEK_CUR); |
| 126 | } |
| 127 | return skip_count; |
| 128 | } |
| 129 | |
| 130 | void FileInputStream::Unread(ByteVector* b) { |
| 131 | Unread(b, 0, b->size()); |
| 132 | } |
| 133 | |
| 134 | void FileInputStream::Unread(ByteVector* b, int32_t offset, int32_t length) { |
| 135 | assert(b); |
| 136 | assert(b->size() >= size_t(offset + length)); |
| 137 | if (!file_) { |
| 138 | #if !defined (SFNTLY_NO_EXCEPTION) |
| 139 | throw IOException("no opened file"); |
| 140 | #endif |
| 141 | return; |
| 142 | } |
| 143 | size_t unread_count = std::min<size_t>(position_, length); |
| 144 | fseek(file_, position_ - unread_count, SEEK_SET); |
| 145 | position_ -= unread_count; |
| 146 | Read(b, offset, length); |
| 147 | fseek(file_, position_ - unread_count, SEEK_SET); |
| 148 | position_ -= unread_count; |
| 149 | } |
| 150 | |
| 151 | bool FileInputStream::Open(const char* file_path) { |
| 152 | assert(file_path); |
| 153 | if (file_) { |
| 154 | Close(); |
| 155 | } |
| 156 | #if defined (WIN32) |
| 157 | fopen_s(&file_, file_path, "rb"); |
| 158 | #else |
| 159 | file_ = fopen(file_path, "rb"); |
| 160 | #endif |
| 161 | if (file_ == NULL) { |
| 162 | return false; |
| 163 | } |
| 164 | |
| 165 | fseek(file_, 0, SEEK_END); |
| 166 | length_ = ftell(file_); |
| 167 | fseek(file_, 0, SEEK_SET); |
| 168 | return true; |
| 169 | } |
| 170 | |
| 171 | } // namespace sfntly |