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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* ostream_compressor.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
static int comp_append(ostream_t *strm, const void *data, size_t size)
{
ostream_comp_t *comp = (ostream_comp_t *)strm;
size_t diff;
while (size > 0) {
if (comp->inbuf_used >= BUFSZ) {
if (comp->flush_inbuf(comp, false))
return -1;
}
diff = BUFSZ - comp->inbuf_used;
if (diff > size)
diff = size;
memcpy(comp->inbuf + comp->inbuf_used, data, diff);
comp->inbuf_used += diff;
data = (const char *)data + diff;
size -= diff;
}
return 0;
}
static int comp_flush(ostream_t *strm)
{
ostream_comp_t *comp = (ostream_comp_t *)strm;
if (comp->inbuf_used > 0) {
if (comp->flush_inbuf(comp, true))
return -1;
}
return comp->wrapped->flush(comp->wrapped);
}
static const char *comp_get_filename(ostream_t *strm)
{
ostream_comp_t *comp = (ostream_comp_t *)strm;
return comp->wrapped->get_filename(comp->wrapped);
}
static void comp_destroy(sqfs_object_t *obj)
{
ostream_comp_t *comp = (ostream_comp_t *)obj;
comp->cleanup(comp);
sqfs_destroy(comp->wrapped);
free(comp);
}
ostream_t *ostream_compressor_create(ostream_t *strm, int comp_id)
{
ostream_comp_t *comp = NULL;
sqfs_object_t *obj;
ostream_t *base;
switch (comp_id) {
case FSTREAM_COMPRESSOR_GZIP:
#ifdef WITH_GZIP
comp = ostream_gzip_create(strm->get_filename(strm));
#endif
break;
case FSTREAM_COMPRESSOR_XZ:
#ifdef WITH_XZ
comp = ostream_xz_create(strm->get_filename(strm));
#endif
break;
case FSTREAM_COMPRESSOR_ZSTD:
#ifdef WITH_ZSTD
comp = ostream_zstd_create(strm->get_filename(strm));
#endif
break;
default:
break;
}
if (comp == NULL)
return NULL;
comp->wrapped = strm;
comp->inbuf_used = 0;
base = (ostream_t *)comp;
base->append = comp_append;
base->flush = comp_flush;
base->get_filename = comp_get_filename;
obj = (sqfs_object_t *)comp;
obj->destroy = comp_destroy;
return base;
}
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