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/*
* Copyright 2007, 2008 Adrian Thurston <thurston@complang.org>
*/
/* This file is part of Colm.
*
* Colm 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.
*
* Colm 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 Colm; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "input.h"
#include "colm.h"
#include "fsmrun.h"
#include <stdio.h>
#include <iostream>
using std::cerr;
using std::endl;
/*
* String
*/
int InputStreamString::getData( char *dest, int length )
{
int available = data.length() - offset;
if ( available < length )
length = available;
memcpy( dest, data.data+offset, length );
offset += length;
if ( offset == data.length() )
eof = true;
return length;
}
void InputStreamString::pushBack( char *data, long len )
{
assert( len <= offset );
offset -= len;
}
/*
* File
*/
int InputStreamFile::isEOF()
{
return queue == 0 && feof( file );
}
int InputStreamFile::needFlush()
{
return queue == 0 && feof( file );
}
int InputStreamFile::getData( char *dest, int length )
{
/* If there is any data in queue, read from that first. */
if ( queue != 0 ) {
long avail = queue->length - queue->offset;
if ( length >= avail ) {
memcpy( dest, &queue->buf[queue->offset], avail );
RunBuf *del = queue;
queue = queue->next;
delete del;
return avail;
}
else {
memcpy( dest, &queue->buf[queue->offset], length );
queue->offset += length;
return length;
}
}
else {
return fread( dest, 1, length, file );
}
}
void InputStreamFile::pushBack( RunBuf *runBuf )
{
runBuf->next = queue;
queue = runBuf;
}
/*
* FD
*/
int InputStreamFD::isEOF()
{
return queue == 0 && eof;
}
int InputStreamFD::needFlush()
{
return queue == 0 && eof;
}
void InputStreamFD::pushBack( RunBuf *runBuf )
{
runBuf->next = queue;
queue = runBuf;
}
int InputStreamFD::getData( char *dest, int length )
{
/* If there is any data in queue, read from that first. */
if ( queue != 0 ) {
long avail = queue->length - queue->offset;
if ( length >= avail ) {
memcpy( dest, &queue->buf[queue->offset], avail );
RunBuf *del = queue;
queue = queue->next;
delete del;
return avail;
}
else {
memcpy( dest, &queue->buf[queue->offset], length );
queue->offset += length;
return length;
}
}
else {
long got = read( fd, dest, length );
if ( got == 0 )
eof = true;
return got;
}
}
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