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 22 FileWrapperInput::FileWrapperInput(const char* name) : 23 _name(name), _at_eof(false), _size_found(false), _size(0) { 24 _file = fopen(name, "rb"); 25 if (NULL == _file) { 26 fprintf(stderr, "Unable to open: %s\n", name); 27 exit(1); 28 } 29 } 30 31 FileWrapperInput::~FileWrapperInput() { 32 fclose(_file); 33 } 34 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 43 bool FileWrapperInput::AtEof() { 44 return _at_eof; 45 } 46 47 off_t FileWrapperInput::Size() { 48 if (_size_found) return _size; 49 struct stat st; 50 if (0 == stat(_name, &st)) { 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 62 bool FileWrapperInput::Seek(uint32_t pos) { 63 return 0 == fseek(_file, (long) pos, SEEK_SET); 64 } 65
