diff options
author | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
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committer | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
commit | e0c6872cf40896c7be36b11dcc744620f10adf1d (patch) | |
tree | 60335e10d2f4354b0674ec22d7b53f0f8abee672 /dviware/dvisvgm/src/InputBuffer.hpp |
Initial commit
Diffstat (limited to 'dviware/dvisvgm/src/InputBuffer.hpp')
-rw-r--r-- | dviware/dvisvgm/src/InputBuffer.hpp | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/dviware/dvisvgm/src/InputBuffer.hpp b/dviware/dvisvgm/src/InputBuffer.hpp new file mode 100644 index 0000000000..8a62b6b011 --- /dev/null +++ b/dviware/dvisvgm/src/InputBuffer.hpp @@ -0,0 +1,139 @@ +/************************************************************************* +** InputBuffer.hpp ** +** ** +** This file is part of dvisvgm -- a fast DVI to SVG converter ** +** Copyright (C) 2005-2019 Martin Gieseking <martin.gieseking@uos.de> ** +** ** +** This program is free software; you can redistribute it and/or ** +** modify it under the terms of the GNU General Public License as ** +** published by the Free Software Foundation; either version 3 of ** +** the License, or (at your option) any later version. ** +** ** +** This program is distributed in the hope that it will be useful, but ** +** WITHOUT ANY WARRANTY; without even the implied warranty of ** +** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ** +** GNU General Public License for more details. ** +** ** +** You should have received a copy of the GNU General Public License ** +** along with this program; if not, see <http://www.gnu.org/licenses/>. ** +*************************************************************************/ + +#ifndef INPUTBUFFER_HPP +#define INPUTBUFFER_HPP + +#include <algorithm> +#include <cstring> +#include <istream> +#include <string> +#include <ostream> + +struct InputBuffer { + virtual ~InputBuffer () =default; + virtual int get () =0; + virtual int peek () const =0; + virtual int peek (size_t n) const =0; + virtual bool eof () const =0; + virtual void invalidate () =0; +}; + + +class StreamInputBuffer : public InputBuffer { + public: + explicit StreamInputBuffer (std::istream &is, size_t bufsize=1024); + ~StreamInputBuffer () override; + int get () override; + int peek () const override; + int peek (size_t n) const override; + bool eof () const override {return pos() == _size1 && _size2 == 0;} + void invalidate () override {_bufptr = _buf1+_size1; _size2 = 0;} + + protected: + int fillBuffer (uint8_t *buf); + size_t pos () const {return _bufptr-_buf1;} + + private: + std::istream &_is; + const size_t _bufsize; ///< maximal number of bytes each buffer can hold + uint8_t *_buf1; ///< pointer to first buffer + uint8_t *_buf2; ///< pointer to second buffer + size_t _size1; ///< number of bytes in buffer 1 + size_t _size2; ///< number of bytes in buffer 2 + uint8_t *_bufptr; ///< pointer to next byte to read +}; + + +class StringInputBuffer : public InputBuffer { + public: + explicit StringInputBuffer (const std::string &str) : _str(&str) {} + void assign (const std::string &str) {_str = &str; _pos=0;} + int get () override {return _pos < _str->length() ? _str->at(_pos++) : -1;} + int peek () const override {return _pos < _str->length() ? _str->at(_pos) : -1;} + int peek (size_t n) const override {return _pos+n < _str->length() ? _str->at(_pos+n) : -1;} + bool eof () const override {return _pos >= _str->length();} + void invalidate () override {_pos = _str->length();} + + private: + const std::string *_str; + size_t _pos=0; +}; + + +class CharInputBuffer : public InputBuffer { + public: + CharInputBuffer (const char *buf, size_t size) : _pos(buf), _size(buf ? size : 0) {} + + int get () override { + if (_size == 0) + return -1; + else { + _size--; + return *_pos++; + } + } + + + void assign (const char *buf, size_t size) { + _pos = buf; + _size = size; + } + + void assign (const char *buf) {assign(buf, std::strlen(buf));} + int peek () const override {return _size > 0 ? *_pos : -1;} + int peek (size_t n) const override {return _size >= n ? _pos[n] : -1;} + bool eof () const override {return _size == 0;} + void invalidate () override {_size = 0;} + + private: + const char *_pos; + size_t _size; +}; + + +class SplittedCharInputBuffer : public InputBuffer { + public: + SplittedCharInputBuffer (const char *buf1, size_t s1, const char *buf2, size_t s2); + int get () override; + int peek () const override; + int peek (size_t n) const override; + bool eof () const override {return _size[_index] == 0;} + void invalidate () override {_size[_index] = 0;} + + private: + const char *_buf[2]; + size_t _size[2]; + int _index; +}; + + +class TextStreamInputBuffer : public StreamInputBuffer { + public: + explicit TextStreamInputBuffer (std::istream &is) : StreamInputBuffer(is) {} + int get () override; + int line () const {return _line;} + int col () const {return _col;} + + private: + int _line=1, _col=1; +}; + +#endif |