1 // Copyright 2015 The Chromium OS Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "file_reader.h" 6 7 #include <string.h> 8 9 #include <memory> 10 11 namespace quipper { 12 13 FileReader::FileReader(const string& filename) { 14 infile_ = fopen(filename.c_str(), "rb"); 15 if (!IsOpen()) { 16 size_ = 0; 17 return; 18 } 19 // Determine the size of the file. 20 fseek(infile_, 0, SEEK_END); 21 size_ = ftell(infile_); 22 23 // Reset to the beginning of the file. 24 fseek(infile_, 0, SEEK_SET); 25 } 26 27 FileReader::~FileReader() { 28 if (IsOpen()) { 29 fclose(infile_); 30 } 31 } 32 33 bool FileReader::ReadData(const size_t size, void* dest) { 34 if (Tell() + size > size_ || fread(dest, 1, size, infile_) < size) 35 return false; 36 return true; 37 } 38 39 bool FileReader::ReadString(const size_t size, string* str) { 40 if (!ReadDataString(size, str)) return false; 41 42 // Truncate anything after a terminating null. 43 size_t actual_length = strnlen(str->data(), size); 44 str->resize(actual_length); 45 return true; 46 } 47 48 } // namespace quipper 49
