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
FileWrapperInput(const char * name)22 FileWrapperInput::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
~FileWrapperInput()31 FileWrapperInput::~FileWrapperInput() {
32 fclose(_file);
33 }
34
Read(uint8_t * buffer,size_t wanted)35 size_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
AtEof()43 bool FileWrapperInput::AtEof() {
44 return _at_eof;
45 }
46
Size()47 off_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
Seek(uint32_t pos)62 bool FileWrapperInput::Seek(uint32_t pos) {
63 return fseek(_file, (long) pos, SEEK_SET) == 0;
64 }
65