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70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
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/**********************************************************************
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* File: cached_file.h
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* Description: Declaration of a Cached File class
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* Author: Ahmad Abdulkader
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* Created: 2007
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*
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* (C) Copyright 2008, Google Inc.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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**********************************************************************/
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#ifndef CACHED_FILE_H
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#define CACHED_FILE_H
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// The CachedFile class provides a large-cache read access to a file
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// It is mainly designed for loading large word dump files
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#include <stdio.h>
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#include <string>
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#ifdef USE_STD_NAMESPACE
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using std::string;
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#endif
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namespace tesseract {
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class CachedFile {
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public:
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explicit CachedFile(string file_name);
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~CachedFile();
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// reads a specified number of bytes to the specified buffer and
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// returns the actual number of bytes read
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int Read(void *read_buff, int bytes);
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// Returns the file size
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long Size();
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// returns the current position in the file
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long Tell();
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// End of file flag
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bool eof();
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private:
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static const unsigned int kCacheSize = 0x8000000;
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// file name
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string file_name_;
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// internal file buffer
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unsigned char *buff_;
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// file position
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long file_pos_;
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// file size
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long file_size_;
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// position of file within buffer
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int buff_pos_;
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// buffer size
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int buff_size_;
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// file handle
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FILE *fp_;
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// Opens the file
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bool Open();
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};
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}
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#endif // CACHED_FILE_H
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