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      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