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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* xz.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
#include <lzma.h>
typedef struct {
istream_comp_t base;
lzma_stream strm;
} istream_xz_t;
static int precache(istream_t *base)
{
istream_xz_t *xz = (istream_xz_t *)base;
istream_t *wrapped = ((istream_comp_t *)base)->wrapped;
lzma_action action;
lzma_ret ret_xz;
int ret;
for (;;) {
ret = istream_precache(wrapped);
if (ret != 0)
return ret;
action = wrapped->eof ? LZMA_FINISH : LZMA_RUN;
xz->strm.avail_in = wrapped->buffer_used;
xz->strm.next_in = wrapped->buffer;
xz->strm.avail_out = BUFSZ - base->buffer_used;
xz->strm.next_out = base->buffer + base->buffer_used;
ret_xz = lzma_code(&xz->strm, action);
base->buffer_used = BUFSZ - xz->strm.avail_out;
wrapped->buffer_offset = wrapped->buffer_used -
xz->strm.avail_in;
if (ret_xz == LZMA_BUF_ERROR)
break;
if (ret_xz == LZMA_STREAM_END) {
base->eof = true;
break;
}
if (ret_xz != LZMA_OK) {
fprintf(stderr,
"%s: internal error in xz decoder.\n",
wrapped->get_filename(wrapped));
return -1;
}
}
return 0;
}
static void cleanup(istream_comp_t *base)
{
istream_xz_t *xz = (istream_xz_t *)base;
lzma_end(&xz->strm);
}
istream_comp_t *istream_xz_create(const char *filename)
{
istream_xz_t *xz = calloc(1, sizeof(*xz));
istream_comp_t *base = (istream_comp_t *)xz;
sqfs_u64 memlimit = 65 * 1024 * 1024;
lzma_ret ret_xz;
if (xz == NULL) {
fprintf(stderr, "%s: creating xz decoder: %s.\n",
filename, strerror(errno));
return NULL;
}
ret_xz = lzma_stream_decoder(&xz->strm, memlimit, LZMA_CONCATENATED);
if (ret_xz != LZMA_OK) {
fprintf(stderr,
"%s: error initializing xz decoder.\n",
filename);
free(xz);
return NULL;
}
((istream_t *)base)->precache = precache;
base->cleanup = cleanup;
return base;
}
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