input_file_buffer.cpp

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// Copyright 2008 Google Inc.
// All Rights Reserved.
// Author: ahmadab@google.com (Ahmad Abdulkader)
//
// input_file_buffer.h: Declarations of a class for an object that
// represents an input file buffer.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <string>
#include "input_file_buffer.h"

namespace tesseract {
// default and only constructor
InputFileBuffer::InputFileBuffer(const string &file_name)
  : file_name_(file_name) {
  fp_ = NULL;
}

// virtual destructor
InputFileBuffer::~InputFileBuffer() {
  if (fp_ != NULL) {
    fclose(fp_);
  }
}

// Read the specified number of bytes to the specified input buffer
int InputFileBuffer::Read(void *buffer, int bytes_to_read) {
  // open the file if necessary
  if (fp_ == NULL) {
    fp_ = fopen(file_name_.c_str(), "rb");
    if (fp_ == NULL) {
      return 0;
    }
  }
  return fread(buffer, 1, bytes_to_read, fp_);
}
}