Aegisub/aegisub/src/auto4_lua_scriptreader.cpp

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// Copyright (c) 2006, 2007, Niels Martin Hansen
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Aegisub Project http://www.aegisub.org/
//
// $Id$
/// @file auto4_lua_scriptreader.cpp
/// @brief Script-file reader for Lua 5.1-based scripting engine
/// @ingroup scripting
///
#include "config.h"
#ifdef WITH_AUTO4_LUA
#include "auto4_lua_scriptreader.h"
/// DOCME
namespace Automation4 {
/// @brief // LuaScriptReader
/// @param filename
///
LuaScriptReader::LuaScriptReader(const wxString &filename)
{
#ifdef WIN32
f = _tfopen(filename.c_str(), _T("rb"));
#else
f = fopen(filename.fn_str(), "rb");
#endif
if (!f)
throw _T("Could not open script file");
first = true;
databuf = new char[bufsize];
}
/// @brief DOCME
///
LuaScriptReader::~LuaScriptReader()
{
if (databuf)
delete[] databuf;
fclose(f);
}
/// @brief DOCME
/// @param L
/// @param data
/// @param size
///
const char* LuaScriptReader::reader_func(lua_State *L, void *data, size_t *size)
{
LuaScriptReader *self = (LuaScriptReader*)(data);
unsigned char *b = (unsigned char *)self->databuf;
FILE *f = self->f;
if (feof(f)) {
*size = 0;
return 0;
}
if (self->first) {
// check if file is sensible and maybe skip bom
if ((*size = fread(b, 1, 4, f)) == 4) {
if (b[0] == 0xEF && b[1] == 0xBB && b[2] == 0xBF) {
// got an utf8 file with bom
// nothing further to do, already skipped the bom
fseek(f, -1, SEEK_CUR);
} else {
// oops, not utf8 with bom
// check if there is some other BOM in place and complain if there is...
if ((b[0] == 0xFF && b[1] == 0xFE && b[2] == 0x00 && b[3] == 0x00) || // utf32be
(b[0] == 0x00 && b[1] == 0x00 && b[2] == 0xFE && b[3] == 0xFF) || // utf32le
(b[0] == 0xFF && b[1] == 0xFE) || // utf16be
(b[0] == 0xFE && b[1] == 0xFF) || // utf16le
(b[0] == 0x2B && b[1] == 0x2F && b[2] == 0x76) || // utf7
(b[0] == 0x00 && b[2] == 0x00) || // looks like utf16be
(b[1] == 0x00 && b[3] == 0x00)) { // looks like utf16le
throw _T("The script file uses an unsupported character set. Only UTF-8 is supported.");
}
// assume utf8 without bom, and rewind file
fseek(f, 0, SEEK_SET);
}
} else {
// hmm, rather short file this...
// doesn't have a bom, assume it's just ascii/utf8 without bom
return self->databuf; // *size is already set
}
self->first = false;
}
*size = fread(b, 1, bufsize, f);
return self->databuf;
}
};
#endif // WITH_AUTO4_LUA