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/*
This file is part of Warzone 2100.
Copyright (C) 1999-2004 Eidos Interactive
Copyright (C) 2005-2020 Warzone 2100 Project
Warzone 2100 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.
Warzone 2100 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 Warzone 2100; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "frame.h"
#include "lexer_input.h"
#include "physfs_ext.h"
#include <limits>
int lexer_input(lexerinput_t *input, char *buf, size_t max_size, int nullvalue)
{
switch (input->type)
{
case LEXINPUT_STDIO:
if (feof(input->input.stdiofile))
{
buf[0] = EOF;
return nullvalue;
}
else
{
return static_cast<int>(fread(buf, 1, max_size, input->input.stdiofile));
}
break;
case LEXINPUT_PHYSFS:
if (PHYSFS_eof(input->input.physfsfile))
{
buf[0] = EOF;
return nullvalue;
}
else
{
ASSERT(max_size <= static_cast<size_t>(std::numeric_limits<PHYSFS_uint32>::max()), "max_size exceeds PHYSFS_uint32::max");
PHYSFS_sint64 result = WZ_PHYSFS_readBytes(input->input.physfsfile, buf, static_cast<PHYSFS_uint32>(max_size));
if (result == -1)
{
buf[0] = EOF;
return nullvalue;
}
if (result > static_cast<PHYSFS_sint64>(std::numeric_limits<int>::max()))
{
ASSERT(false, "Read more than std::numeric_limits<int>::max()?");
buf[0] = EOF;
return nullvalue;
}
return static_cast<int>(result);
}
break;
case LEXINPUT_BUFFER:
if (input->input.buffer.begin != input->input.buffer.end)
{
buf[0] = *input->input.buffer.begin++;
return 1;
}
else
{
buf[0] = EOF;
return nullvalue;
}
break;
}
ASSERT(!"Invalid input type!", "Invalid input type used for lexer (numeric value: %u)", (unsigned int)input->type);
return nullvalue;
}
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