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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.0.9/src/InputBuffer.cpp')
| -rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.0.9/src/InputBuffer.cpp | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.0.9/src/InputBuffer.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.0.9/src/InputBuffer.cpp new file mode 100644 index 00000000000..f5e7125f80b --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.0.9/src/InputBuffer.cpp @@ -0,0 +1,137 @@ +/************************************************************************* +** InputBuffer.cpp ** +** ** +** This file is part of dvisvgm -- the DVI to SVG converter ** +** Copyright (C) 2005-2011 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/>. ** +*************************************************************************/ + +#include <cmath> +#include <cstring> +#include "InputBuffer.h" + +using namespace std; + + +StreamInputBuffer::StreamInputBuffer (istream &is, unsigned bufsize) + : _is(is), _bufsize(bufsize), _buf1(new UInt8[_bufsize]), _buf2(new UInt8[_bufsize]), _bufptr(_buf1) +{ + _size1 = fillBuffer(_buf1); + _size2 = fillBuffer(_buf2); +} + + +StreamInputBuffer::~StreamInputBuffer () { + delete [] _buf1; + delete [] _buf2; +} + + +int StreamInputBuffer::get () { + if (pos() == _size1) { + if (_size2 == 0) + return -1; + swap(_buf1, _buf2); + _size1 = _size2; + _bufptr = _buf1; + _size2 = fillBuffer(_buf2); + } + UInt8 c = *_bufptr++; + return c; +} + + +/** Returns the next character to be read without skipping it. + * Same as peek(0). */ +int StreamInputBuffer::peek () const { + if (pos() < _size1) + return *_bufptr; + return _size2 > 0 ? *_buf2 : -1; +} + + +/** Returns the n-th next character without skipping it. */ +int StreamInputBuffer::peek (unsigned n) const { + if (pos()+n < _size1) + return *(_bufptr+n); + if (pos()+n < _size1+_size2) + return *(_buf2 + pos()+n-_size1); + return -1; +} + + +/** Fills the buffer by reading a sequence of characters from the assigned + * input stream. + * @param[in] buf pointer to character buffer to be filled + * @return number of characters read */ +int StreamInputBuffer::fillBuffer (UInt8 *buf) { + if (_is && !_is.eof()) { + _is.read((char*)buf, _bufsize); + return _is.gcount(); + } + return 0; +} + +/////////////////////////////////////////////// + +SplittedCharInputBuffer::SplittedCharInputBuffer (const char *buf1, unsigned s1, const char *buf2, unsigned s2) { + _buf[0] = buf1; + _buf[1] = buf2; + _size[0] = buf1 ? s1 : 0; + _size[1] = buf2 ? s2 : 0; + _index = _size[0] ? 0 : 1; +} + + +int SplittedCharInputBuffer::get () { + if (_size[_index] == 0) + return -1; + int ret = *_buf[_index]++; + _size[_index]--; + if (_index == 0 && _size[0] == 0) + _index++; + return ret; +} + + +int SplittedCharInputBuffer::peek () const { + return _size[_index] ? *_buf[_index] : -1; +} + + +int SplittedCharInputBuffer::peek (unsigned n) const { + if (n < _size[_index]) + return _buf[_index][n]; + n -= _size[_index]; + if (_index == 0 && n < _size[1]) + return _buf[1][n]; + return -1; +} + +/////////////////////////////////////////////// + + +int TextStreamInputBuffer::get () { + int c = StreamInputBuffer::get(); + if (c == '\n') { + _line++; + _col = 1; + } + else + _col++; + return c; +} + + |