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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* ostream.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
#include "sqfs/io.h"
#include "sqfs/error.h"
typedef struct ostream_xfrm_t {
sqfs_ostream_t base;
sqfs_ostream_t *wrapped;
xfrm_stream_t *xfrm;
size_t inbuf_used;
sqfs_u8 inbuf[BUFSZ];
sqfs_u8 outbuf[BUFSZ];
} ostream_xfrm_t;
static int flush_inbuf(ostream_xfrm_t *xfrm, bool finish)
{
const sqfs_u32 avail_out = sizeof(xfrm->outbuf);
const sqfs_u32 avail_in = xfrm->inbuf_used;
const int mode = finish ? XFRM_STREAM_FLUSH_FULL :
XFRM_STREAM_FLUSH_NONE;
sqfs_u32 off_in = 0, off_out = 0;
int ret, ioret;
while (finish || off_in < avail_in) {
ret = xfrm->xfrm->process_data(xfrm->xfrm,
xfrm->inbuf + off_in,
avail_in - off_in,
xfrm->outbuf + off_out,
avail_out - off_out,
&off_in, &off_out, mode);
if (ret == XFRM_STREAM_ERROR)
return SQFS_ERROR_COMPRESSOR;
ioret = xfrm->wrapped->append(xfrm->wrapped,
xfrm->outbuf, off_out);
if (ioret)
return ioret;
off_out = 0;
if (ret == XFRM_STREAM_END)
break;
}
if (off_out > 0) {
ret = xfrm->wrapped->append(xfrm->wrapped,
xfrm->outbuf, off_out);
if (ret)
return ret;
}
if (off_in < avail_in) {
memmove(xfrm->inbuf, xfrm->inbuf + off_in, avail_in - off_in);
xfrm->inbuf_used -= off_in;
} else {
xfrm->inbuf_used = 0;
}
return 0;
}
static int xfrm_append(sqfs_ostream_t *strm, const void *data, size_t size)
{
ostream_xfrm_t *xfrm = (ostream_xfrm_t *)strm;
size_t diff;
while (size > 0) {
if (xfrm->inbuf_used >= BUFSZ) {
int ret = flush_inbuf(xfrm, false);
if (ret)
return ret;
}
diff = BUFSZ - xfrm->inbuf_used;
if (diff > size)
diff = size;
if (data == NULL) {
memset(xfrm->inbuf + xfrm->inbuf_used, 0, diff);
} else {
memcpy(xfrm->inbuf + xfrm->inbuf_used, data, diff);
data = (const char *)data + diff;
}
xfrm->inbuf_used += diff;
size -= diff;
}
return 0;
}
static int xfrm_flush(sqfs_ostream_t *strm)
{
ostream_xfrm_t *xfrm = (ostream_xfrm_t *)strm;
if (xfrm->inbuf_used > 0) {
int ret = flush_inbuf(xfrm, true);
if (ret)
return ret;
}
return xfrm->wrapped->flush(xfrm->wrapped);
}
static const char *xfrm_get_filename(sqfs_ostream_t *strm)
{
ostream_xfrm_t *xfrm = (ostream_xfrm_t *)strm;
return xfrm->wrapped->get_filename(xfrm->wrapped);
}
static void xfrm_destroy(sqfs_object_t *obj)
{
ostream_xfrm_t *xfrm = (ostream_xfrm_t *)obj;
sqfs_drop(xfrm->wrapped);
sqfs_drop(xfrm->xfrm);
free(xfrm);
}
sqfs_ostream_t *ostream_xfrm_create(sqfs_ostream_t *strm, xfrm_stream_t *xfrm)
{
ostream_xfrm_t *stream = calloc(1, sizeof(*stream));
sqfs_ostream_t *base = (sqfs_ostream_t *)stream;
if (stream == NULL)
goto fail;
sqfs_object_init(stream, xfrm_destroy, NULL);
stream->wrapped = sqfs_grab(strm);
stream->xfrm = sqfs_grab(xfrm);
stream->inbuf_used = 0;
base->append = xfrm_append;
base->flush = xfrm_flush;
base->get_filename = xfrm_get_filename;
return base;
fail:
fprintf(stderr, "%s: error initializing compressor.\n",
strm->get_filename(strm));
return NULL;
}
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