58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
// Copyright (C) 2005, Ondra Kamenik
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// $Id: memory_file.h 762 2006-05-22 13:00:07Z kamenik $
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#ifndef OGU_MEMORY_FILE
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#define OGU_MEMORY_FILE
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namespace ogu {
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/** This function calculates an offset of a given position in a
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* given string. The position is given by the line number and by
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* the offset in the line (both starting from 1). */
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int calc_pos_offset(int length, const char* str, int line, int col);
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/** This function calculates a line number and column number of a
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* character given by the offset in the string. It is inverse to
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* calc_pos_offset. */
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void calc_pos_line_and_col(int length, const char* str, int offset,
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int& line, int& col);
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/** This class opens a given file and makes its copy in memory and
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* appends it with the '\0' character. Since the type of length is
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* int, it can store files with size at most 4GB. If the file
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* could be opened for reading, data is NULL and length is -1. If
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* the file is empty but exists, len is zero and data points to a
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* newly allocated memory containing '\0' character at the end. */
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class MemoryFile {
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protected:
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int len;
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char* data;
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public:
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MemoryFile(const char* fname);
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virtual ~MemoryFile()
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{if (data) delete [] data;}
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int length() const
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{return len;}
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const char* base() const
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{return data;}
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bool exists() const
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{return len != -1;}
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/** Return the offset of a character in the given line
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* (starting from 1) with the given offset in the line. */
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int offset(int line, int lineoff) const
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{return calc_pos_offset(len, data, line, lineoff);}
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/** Return the line number and column number of the character
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* defined by the offset. */
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void line_and_col(int offset, int& line, int& col) const
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{calc_pos_line_and_col(len, data, offset, line, col);}
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};
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};
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#endif
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// Local Variables:
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// mode:C++
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// End:
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