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/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matthias Scheler.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#define FILEIO_INTERNAL /**/
#include "fileio.h"
#include <inttypes.h>
#include <lzma.h>
typedef struct {
lzma_stream id_Stream;
int id_FD;
size_t id_Chunk;
uint8_t id_Buffer[1 << 16];
} InstData;
static void
LZMACloseFunc(FileHandle *fh)
{
InstData *id;
id = fh->fh_InstData;
if (id != NULL) {
lzma_end(&id->id_Stream);
if (id->id_FD >= 0)
(void)close(id->id_FD);
fh->fh_InstData = NULL;
}
}
static ssize_t
LZMAReadFunc(FileHandle *fh, void *buffer, size_t bytes)
{
InstData *id;
lzma_stream *stream;
ssize_t rbytes;
lzma_ret ret;
id = fh->fh_InstData;
if (id == NULL)
return 0;
stream = &id->id_Stream;
if (stream->avail_in == 0 && id->id_FD >= 0) {
rbytes = read(id->id_FD, id->id_Buffer, id->id_Chunk);
if (rbytes < 0) {
LZMACloseFunc(fh);
return rbytes;
}
if (rbytes > 0) {
stream->next_in = id->id_Buffer;
stream->avail_in = rbytes;
id->id_Chunk = sizeof(id->id_Buffer);
} else {
(void)close(id->id_FD);
id->id_FD = -1;
}
}
stream->next_out = buffer;
stream->avail_out = bytes;
ret = lzma_code(stream,
(stream->avail_in > 0) ? LZMA_RUN : LZMA_FINISH);
rbytes = (ret == LZMA_OK || ret == LZMA_STREAM_END) ?
(ssize_t)(bytes - stream->avail_out) : -1;
if (ret != LZMA_OK)
LZMACloseFunc(fh);
return rbytes;
}
FileHandle *
FileHandleLZMA(int *fd_p)
{
FileHandle *fh;
InstData *id;
off_t offset;
fh = FileHandleCreate(LZMACloseFunc, LZMAReadFunc, sizeof(*id));
if (fh == NULL)
return NULL;
id = fh->fh_InstData;
if (lzma_auto_decoder(&id->id_Stream, 1U << 30,
LZMA_CONCATENATED) != LZMA_OK) {
fh->fh_InstData = NULL;
FileHandleClose(fh);
return NULL;
}
id->id_FD = *fd_p;
*fd_p = -1;
id->id_Chunk = sizeof(id->id_Buffer);
offset = lseek(id->id_FD, 0, SEEK_CUR);
if (offset != -1) {
id->id_Chunk = sizeof(id->id_Buffer) -
(size_t)offset % sizeof(id->id_Buffer);
}
return fh;
}
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