1/*
2 * Copyright 2012, 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 <sys/stat.h>
18#include <stdlib.h>
19
20#include "bcinfo/Wrap/file_wrapper_input.h"
21
22FileWrapperInput::FileWrapperInput(const char* name) :
23    _name(name), _at_eof(false), _size_found(false), _size(0) {
24  _file = fopen(name, "rb");
25  if (_file == nullptr) {
26    fprintf(stderr, "Unable to open: %s\n", name);
27    exit(1);
28  }
29}
30
31FileWrapperInput::~FileWrapperInput() {
32  fclose(_file);
33}
34
35size_t FileWrapperInput::Read(uint8_t* buffer, size_t wanted) {
36  size_t found = fread((char*) buffer, 1, wanted, _file);
37  if (feof(_file) || ferror(_file)) {
38    _at_eof = true;
39  }
40  return found;
41}
42
43bool FileWrapperInput::AtEof() {
44  return _at_eof;
45}
46
47off_t FileWrapperInput::Size() {
48  if (_size_found) return _size;
49  struct stat st;
50  if (stat(_name, &st) == 0) {
51    _size_found = true;
52    _size = st.st_size;
53    return _size;
54  } else {
55    fprintf(stderr, "Unable to compute file size: %s\n", _name);
56    exit(1);
57  }
58  // NOT REACHABLE.
59  return 0;
60}
61
62bool FileWrapperInput::Seek(uint32_t pos) {
63  return fseek(_file, (long) pos, SEEK_SET) == 0;
64}
65