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// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id: deh_io.c 153 2005-10-02 23:49:01Z fraggle $
//
// Copyright(C) 2005 Simon Howard
//
// 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., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// $Log$
// Revision 1.1 2005/10/02 23:49:01 fraggle
// The beginnings of dehacked support
//
//
//-----------------------------------------------------------------------------
//
// Dehacked I/O code (does all reads from dehacked files)
//
//-----------------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "z_zone.h"
#include "deh_defs.h"
#include "deh_io.h"
struct deh_context_s
{
FILE *stream;
char *readbuffer;
int readbuffer_size;
};
// Open a dehacked file for reading
// Returns NULL if open failed
deh_context_t *DEH_OpenFile(char *filename)
{
FILE *fstream;
deh_context_t *context;
fstream = fopen(filename, "r");
if (fstream == NULL)
return NULL;
context = Z_Malloc(sizeof(*context), PU_STATIC, NULL);
context->stream = fstream;
// Initial read buffer size of 128 bytes
context->readbuffer_size = 128;
context->readbuffer = Z_Malloc(context->readbuffer_size, PU_STATIC, NULL);
return context;
}
// Close dehacked file
void DEH_CloseFile(deh_context_t *context)
{
fclose(context->stream);
Z_Free(context->readbuffer);
Z_Free(context);
}
// Reads a single character from a dehacked file
int DEH_GetChar(deh_context_t *context)
{
int result;
// Read characters, but ignore carriage returns
// Essentially this is a DOS->Unix conversion
do
{
if (feof(context->stream))
{
// end of file
result = -1;
}
else
{
result = fgetc(context->stream);
}
} while (result == '\r');
return result;
}
// Increase the read buffer size
static void IncreaseReadBuffer(deh_context_t *context)
{
char *newbuffer;
int newbuffer_size;
newbuffer_size = context->readbuffer_size * 2;
newbuffer = Z_Malloc(newbuffer_size, PU_STATIC, NULL);
memcpy(newbuffer, context->readbuffer, context->readbuffer_size);
Z_Free(context->readbuffer);
context->readbuffer = newbuffer;
context->readbuffer_size = newbuffer_size;
}
// Read a whole line
char *DEH_ReadLine(deh_context_t *context)
{
char *p;
int c;
int pos;
for (pos=0; ; ++pos)
{
c = DEH_GetChar(context);
if (c < 0)
{
// end of file
return NULL;
}
// cope with lines of any length: increase the buffer size
if (pos >= context->readbuffer_size)
{
IncreaseReadBuffer(context);
}
if (c == '\n')
{
// end of line: a full line has been read
context->readbuffer[pos] = '\0';
break;
}
else
{
context->readbuffer[pos] = (char) c;
}
}
return context->readbuffer;
}
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