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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* istream.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "../internal.h"
typedef struct istream_xfrm_t {
istream_t base;
istream_t *wrapped;
xfrm_stream_t *xfrm;
sqfs_u8 uncompressed[BUFSZ];
} istream_xfrm_t;
static int xfrm_precache(istream_t *base)
{
istream_xfrm_t *xfrm = (istream_xfrm_t *)base;
int ret;
if (base->buffer_offset >= base->buffer_used) {
base->buffer_offset = 0;
base->buffer_used = 0;
} else if (base->buffer_offset > 0) {
memmove(base->buffer,
base->buffer + base->buffer_offset,
base->buffer_used - base->buffer_offset);
base->buffer_used -= base->buffer_offset;
base->buffer_offset = 0;
}
if (base->eof)
return 0;
ret = istream_precache(xfrm->wrapped);
if (ret != 0)
return ret;
for (;;) {
const sqfs_u32 in_sz = xfrm->wrapped->buffer_used;
const sqfs_u32 out_sz = sizeof(xfrm->uncompressed);
sqfs_u32 in_off = 0, out_off = base->buffer_used;
int mode = XFRM_STREAM_FLUSH_NONE;
if (xfrm->wrapped->eof)
mode = XFRM_STREAM_FLUSH_FULL;
ret = xfrm->xfrm->process_data(xfrm->xfrm,
xfrm->wrapped->buffer, in_sz,
base->buffer + out_off,
out_sz - out_off,
&in_off, &out_off, mode);
if (ret == XFRM_STREAM_ERROR) {
fprintf(stderr, "%s: internal error in decompressor.\n",
base->get_filename(base));
return -1;
}
base->buffer_used = out_off;
xfrm->wrapped->buffer_offset = in_off;
if (ret == XFRM_STREAM_BUFFER_FULL || out_off >= out_sz)
break;
ret = istream_precache(xfrm->wrapped);
if (ret != 0)
return ret;
if (xfrm->wrapped->eof && xfrm->wrapped->buffer_used == 0) {
if (base->buffer_used == 0)
base->eof = true;
break;
}
}
return 0;
}
static const char *xfrm_get_filename(istream_t *strm)
{
istream_xfrm_t *xfrm = (istream_xfrm_t *)strm;
return xfrm->wrapped->get_filename(xfrm->wrapped);
}
static void xfrm_destroy(sqfs_object_t *obj)
{
istream_xfrm_t *xfrm = (istream_xfrm_t *)obj;
sqfs_drop(xfrm->xfrm);
sqfs_drop(xfrm->wrapped);
free(xfrm);
}
istream_t *istream_xfrm_create(istream_t *strm, xfrm_stream_t *xfrm)
{
istream_xfrm_t *stream = calloc(1, sizeof(*stream));
istream_t *base = (istream_t *)stream;
if (stream == NULL)
goto fail;
sqfs_object_init(stream, xfrm_destroy, NULL);
stream->wrapped = sqfs_grab(strm);
stream->xfrm = sqfs_grab(xfrm);
base->precache = xfrm_precache;
base->get_filename = xfrm_get_filename;
base->buffer = stream->uncompressed;
base->eof = false;
return base;
fail:
fprintf(stderr, "%s: error initializing decompressor stream.\n",
strm->get_filename(strm));
return NULL;
}
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