diff options
Diffstat (limited to 'engines/cge/cfile.cpp')
| -rw-r--r-- | engines/cge/cfile.cpp | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/engines/cge/cfile.cpp b/engines/cge/cfile.cpp new file mode 100644 index 0000000000..23881cf89a --- /dev/null +++ b/engines/cge/cfile.cpp @@ -0,0 +1,179 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * 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 2 + * 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, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + +/* + * This code is based on original Soltys source code + * Copyright (c) 1994-1995 Janus B. Wisniewski and L.K. Avalon + */ + +#include "cge/cfile.h" +#include "common/system.h" +#include "cge/cge.h" +#include "common/debug.h" +#include "common/debug-channels.h" + +namespace CGE { + +IoBuf::IoBuf(Crypt *crypt) + : IoHand(crypt), + _bufMark(0), + _ptr(0), + _lim(0) { + debugC(1, kCGEDebugFile, "IoBuf::IoBuf(crypt)"); + + _buff = (uint8 *) malloc(sizeof(uint8) * kBufferSize); + assert(_buff != NULL); +} + +IoBuf::IoBuf(const char *name, Crypt *crypt) + : IoHand(name, crypt), + _bufMark(0), + _ptr(0), + _lim(0) { + debugC(1, kCGEDebugFile, "IoBuf::IoBuf(%s, crypt)", name); + + _buff = (uint8 *) malloc(sizeof(uint8) * kBufferSize); + assert(_buff != NULL); +} + +IoBuf::~IoBuf() { + debugC(6, kCGEDebugFile, "IoBuf::~IoBuf()"); + free(_buff); +} + +void IoBuf::readBuf() { + debugC(4, kCGEDebugFile, "IoBuf::readBuf()"); + + _bufMark = IoHand::mark(); + _lim = IoHand::read(_buff, kBufferSize); + _ptr = 0; +} + +uint16 IoBuf::read(void *buf, uint16 len) { + debugC(4, kCGEDebugFile, "IoBuf::read(buf, %d)", len); + + uint16 total = 0; + while (len) { + if (_ptr >= _lim) + readBuf(); + uint16 n = _lim - _ptr; + if (n) { + if (len < n) + n = len; + memcpy(buf, _buff + _ptr, n); + buf = (uint8 *)buf + n; + len -= n; + total += n; + _ptr += n; + } else + break; + } + return total; +} + +uint16 IoBuf::read(uint8 *buf) { + debugC(3, kCGEDebugFile, "IoBuf::read(buf)"); + + uint16 total = 0; + + while (total < kLineMaxSize - 2) { + if (_ptr >= _lim) + readBuf(); + uint8 *p = _buff + _ptr; + uint16 n = _lim - _ptr; + if (n) { + if (total + n >= kLineMaxSize - 2) + n = kLineMaxSize - 2 - total; + uint8 *eol = (uint8 *) memchr(p, '\r', n); + if (eol) + n = (uint16)(eol - p); + uint8 *eof = (uint8 *) memchr(p, '\32', n); + if (eof) { // end-of-file + n = (uint16)(eof - p); + _ptr = (uint16)(eof - _buff); + } + if (n) + memcpy(buf, p, n); + buf += n; + total += n; + if (eof) + break; + _ptr += n; + if (eol) { + _ptr++; + *(buf++) = '\n'; + total++; + if (_ptr >= _lim) + readBuf(); + if (_ptr < _lim) + if (_buff[_ptr] == '\n') + ++_ptr; + break; + } + } else + break; + } + *buf = '\0'; + return total; +} + +int IoBuf::read() { + debugC(1, kCGEDebugFile, "IoBuf::read()"); + + if (_ptr >= _lim) { + readBuf(); + if (_lim == 0) + return -1; + } + return _buff[_ptr++]; +} + +uint16 CFile::_maxLineLen = kLineMaxSize; + +CFile::CFile(const char *name, Crypt *crypt) + : IoBuf(name, crypt) { + debugC(1, kCGEDebugFile, "CFile::CFile(%s, crypt)", name); +} + +CFile::~CFile() { +} + +long CFile::mark() { + debugC(5, kCGEDebugFile, "CFile::mark()"); + + return _bufMark + _ptr; +} + +long CFile::seek(long pos) { + debugC(1, kCGEDebugFile, "CFile::seek(%ld)", pos); + + if (pos >= _bufMark && pos < _bufMark + _lim) { + _ptr = (uint16)(pos - _bufMark); + return pos; + } else { + _lim = 0; + _ptr = 0; + return _bufMark = IoHand::seek(pos); + } +} + +} // End of namespace CGE |