/*
* Copyright (C) 2002 RealVNC Ltd. All Rights Reserved.
* Copyright (C) 2003 Sun Microsystems, Inc.
*
* This 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 software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include "zrleoutstream.h"
#include <stdlib.h>
#define ZRLE_IN_BUFFER_SIZE 16384
#define ZRLE_OUT_BUFFER_SIZE 1024
#undef ZRLE_DEBUG
static rfbBool zrleBufferAlloc(zrleBuffer *buffer, int size)
{
buffer->ptr = buffer->start = malloc(size);
if (buffer->start == NULL) {
buffer->end = NULL;
return FALSE;
}
buffer->end = buffer->start + size;
return TRUE;
}
static void zrleBufferFree(zrleBuffer *buffer)
{
if (buffer->start)
free(buffer->start);
buffer->start = buffer->ptr = buffer->end = NULL;
}
static rfbBool zrleBufferGrow(zrleBuffer *buffer, int size)
{
int offset;
size += buffer->end - buffer->start;
offset = ZRLE_BUFFER_LENGTH (buffer);
buffer->start = realloc(buffer->start, size);
if (!buffer->start) {
return FALSE;
}
buffer->end = buffer->start + size;
buffer->ptr = buffer->start + offset;
return TRUE;
}
zrleOutStream *zrleOutStreamNew(void)
{
zrleOutStream *os;
os = malloc(sizeof(zrleOutStream));
if (os == NULL)
return NULL;
if (!zrleBufferAlloc(&os->in, ZRLE_IN_BUFFER_SIZE)) {
free(os);
return NULL;
}
if (!zrleBufferAlloc(&os->out, ZRLE_OUT_BUFFER_SIZE)) {
zrleBufferFree(&os->in);
free(os);
return NULL;
}
os->zs.zalloc = Z_NULL;
os->zs.zfree = Z_NULL;
os->zs.opaque = Z_NULL;
if (deflateInit(&os->zs, Z_DEFAULT_COMPRESSION) != Z_OK) {
zrleBufferFree(&os->in);
free(os);
return NULL;
}
return os;
}
void zrleOutStreamFree (zrleOutStream *os)
{
deflateEnd(&os->zs);
zrleBufferFree(&os->in);
zrleBufferFree(&os->out);
free(os);
}
rfbBool zrleOutStreamFlush(zrleOutStream *os)
{
os->zs.next_in = os->in.start;
os->zs.avail_in = ZRLE_BUFFER_LENGTH (&os->in);
#ifdef ZRLE_DEBUG
rfbLog("zrleOutStreamFlush: avail_in %d\n", os->zs.avail_in);
#endif
while (os->zs.avail_in != 0) {
do {
int ret;
if (os->out.ptr >= os->out.end &&
!zrleBufferGrow(&os->out, os->out.end - os->out.start)) {
rfbLog("zrleOutStreamFlush: failed to grow output buffer\n");
return FALSE;
}
os->zs.next_out = os->out.ptr;
os->zs.avail_out = os->out.end - os->out.ptr;
#ifdef ZRLE_DEBUG
rfbLog("zrleOutStreamFlush: calling deflate, avail_in %d, avail_out %d\n",
os->zs.avail_in, os->zs.avail_out);
#endif
if ((ret = deflate(&os->zs, Z_SYNC_FLUSH)) != Z_OK) {
rfbLog("zrleOutStreamFlush: deflate failed with error code %d\n", ret);
return FALSE;
}
#ifdef ZRLE_DEBUG
rfbLog("zrleOutStreamFlush: after deflate: %d bytes\n",
os->zs.next_out - os->out.ptr);
#endif
os->out.ptr = os->zs.next_out;
} while (os->zs.avail_out == 0);
}
os->in.ptr = os->in.start;
return TRUE;
}
static int zrleOutStreamOverrun(zrleOutStream *os,
int size)
{
#ifdef ZRLE_DEBUG
rfbLog("zrleOutStreamOverrun\n");
#endif
while (os->in.end - os->in.ptr < size && os->in.ptr > os->in.start) {
os->zs.next_in = os->in.start;
os->zs.avail_in = ZRLE_BUFFER_LENGTH (&os->in);
do {
int ret;
if (os->out.ptr >= os->out.end &&
!zrleBufferGrow(&os->out, os->out.end - os->out.start)) {
rfbLog("zrleOutStreamOverrun: failed to grow output buffer\n");
return FALSE;
}
os->zs.next_out = os->out.ptr;
os->zs.avail_out = os->out.end - os->out.ptr;
#ifdef ZRLE_DEBUG
rfbLog("zrleOutStreamOverrun: calling deflate, avail_in %d, avail_out %d\n",
os->zs.avail_in, os->zs.avail_out);
#endif
if ((ret = deflate(&os->zs, 0)) != Z_OK) {
rfbLog("zrleOutStreamOverrun: deflate failed with error code %d\n", ret);
return 0;
}
#ifdef ZRLE_DEBUG
rfbLog("zrleOutStreamOverrun: after deflate: %d bytes\n",
os->zs.next_out - os->out.ptr);
#endif
os->out.ptr = os->zs.next_out;
} while (os->zs.avail_out == 0);
/* output buffer not full */
if (os->zs.avail_in == 0) {
os->in.ptr = os->in.start;
} else {
/* but didn't consume all the data? try shifting what's left to the
* start of the buffer.
*/
rfbLog("zrleOutStreamOverrun: out buf not full, but in data not consumed\n");
memmove(os->in.start, os->zs.next_in, os->in.ptr - os->zs.next_in);
os->in.ptr -= os->zs.next_in - os->in.start;
}
}
if (size > os->in.end - os->in.ptr)
size = os->in.end - os->in.ptr;
return size;
}
static int zrleOutStreamCheck(zrleOutStream *os, int size)
{
if (os->in.ptr + size > os->in.end) {
return zrleOutStreamOverrun(os, size);
}
return size;
}
void zrleOutStreamWriteBytes(zrleOutStream *os,
const zrle_U8 *data,
int length)
{
const zrle_U8* dataEnd = data + length;
while (data < dataEnd) {
int n = zrleOutStreamCheck(os, dataEnd - data);
memcpy(os->in.ptr, data, n);
os->in.ptr += n;
data += n;
}
}
void zrleOutStreamWriteU8(zrleOutStream *os, zrle_U8 u)
{
zrleOutStreamCheck(os, 1);
*os->in.ptr++ = u;
}
void zrleOutStreamWriteOpaque8(zrleOutStream *os, zrle_U8 u)
{
zrleOutStreamCheck(os, 1);
*os->in.ptr++ = u;
}
void zrleOutStreamWriteOpaque16 (zrleOutStream *os, zrle_U16 u)
{
zrleOutStreamCheck(os, 2);
*os->in.ptr++ = ((zrle_U8*)&u)[0];
*os->in.ptr++ = ((zrle_U8*)&u)[1];
}
void zrleOutStreamWriteOpaque32 (zrleOutStream *os, zrle_U32 u)
{
zrleOutStreamCheck(os, 4);
*os->in.ptr++ = ((zrle_U8*)&u)[0];
*os->in.ptr++ = ((zrle_U8*)&u)[1];
*os->in.ptr++ = ((zrle_U8*)&u)[2];
*os->in.ptr++ = ((zrle_U8*)&u)[3];
}
void zrleOutStreamWriteOpaque24A(zrleOutStream *os, zrle_U32 u)
{
zrleOutStreamCheck(os, 3);
*os->in.ptr++ = ((zrle_U8*)&u)[0];
*os->in.ptr++ = ((zrle_U8*)&u)[1];
*os->in.ptr++ = ((zrle_U8*)&u)[2];
}
void zrleOutStreamWriteOpaque24B(zrleOutStream *os, zrle_U32 u)
{
zrleOutStreamCheck(os, 3);
*os->in.ptr++ = ((zrle_U8*)&u)[1];
*os->in.ptr++ = ((zrle_U8*)&u)[2];
*os->in.ptr++ = ((zrle_U8*)&u)[3];
}