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git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@964 d0cd1f9f-072b-0410-8dd7-cf729c803f20
102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
/**********************************************************************
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* File: fileio.h
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* Description: File I/O utilities.
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* Author: Samuel Charron
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* Created: Tuesday, July 9, 2013
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*
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* (C) Copyright 2013, Google Inc.
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required
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* by applicable law or agreed to in writing, software distributed under the
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* License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
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* OF ANY KIND, either express or implied. See the License for the specific
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* language governing permissions and limitations under the License.
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*
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**********************************************************************/
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#ifndef TESSERACT_TRAINING_FILEIO_H_
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#define TESSERACT_TRAINING_FILEIO_H_
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#include <stddef.h>
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#include <cstdio>
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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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// A class to manipulate FILE*s.
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class File {
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public:
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// Try to open the file 'filename' in mode 'mode'.
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// Stop the program if it cannot open it.
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static FILE* OpenOrDie(const string& filename, const string& mode);
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static FILE* Open(const string& filename, const string& mode);
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// Try to open the file 'filename' and to write 'str' in it.
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// Stop the program if it fails.
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static void WriteStringToFileOrDie(const string& str, const string& filename);
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// Return true if the file 'filename' is readable.
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static bool Readable(const string& filename);
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static void ReadFileToStringOrDie(const string& filename, string* out);
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static bool ReadFileToString(const string& filename, string* out);
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// Helper methods
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// Concatenate file paths removing any extra intervening '/' symbols.
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static string JoinPath(const string& prefix, const string& suffix);
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// Delete a filename or all filenames matching a glob pattern.
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static bool Delete(const char* pathname);
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static bool DeleteMatchingFiles(const char* pattern);
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};
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// A class to manipulate Files for reading.
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class InputBuffer {
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public:
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explicit InputBuffer(FILE* stream);
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// 'size' is ignored.
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InputBuffer(FILE* stream, size_t size);
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~InputBuffer();
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// Read data until end-of-file or a \n is read.
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// The data is stored in '*out', excluding the \n if present.
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// Return false if an error occurs or at end-of-file, true otherwise.
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bool ReadLine(string* out);
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// Close the FILE* used by InputBuffer.
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// Return false if an error occurs, true otherwise.
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bool CloseFile();
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private:
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FILE* stream_;
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int filesize_;
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};
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// A class to manipulate Files for writing.
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class OutputBuffer {
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public:
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explicit OutputBuffer(FILE* stream);
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// 'size' is ignored.
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OutputBuffer(FILE* stream, size_t size);
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~OutputBuffer();
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// Write string 'str' to the open FILE*.
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void WriteString(const string& str);
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// Close the FILE* used by InputBuffer.
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// Return false if an error occurs, true otherwise.
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bool CloseFile();
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private:
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FILE* stream_;
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};
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} // namespace tesseract
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#endif // TESSERACT_TRAINING_FILEIO_H_
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