136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
/* $NetBSD: fileio-lzma.c,v 1.2 2019/12/01 06:03:58 rin Exp $ */
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/*-
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* Copyright (c) 2011 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matthias Scheler.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#define FILEIO_INTERNAL /**/
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#include "fileio.h"
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#include <inttypes.h>
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#include <lzma.h>
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typedef struct {
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lzma_stream id_Stream;
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int id_FD;
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size_t id_Chunk;
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uint8_t id_Buffer[1 << 16];
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} InstData;
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static void
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LZMACloseFunc(FileHandle *fh)
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{
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InstData *id;
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id = fh->fh_InstData;
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if (id != NULL) {
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lzma_end(&id->id_Stream);
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if (id->id_FD >= 0)
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(void)close(id->id_FD);
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fh->fh_InstData = NULL;
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}
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}
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static ssize_t
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LZMAReadFunc(FileHandle *fh, void *buffer, size_t bytes)
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{
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InstData *id;
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lzma_stream *stream;
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ssize_t rbytes;
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lzma_ret ret;
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id = fh->fh_InstData;
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if (id == NULL)
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return 0;
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stream = &id->id_Stream;
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if (stream->avail_in == 0 && id->id_FD >= 0) {
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rbytes = read(id->id_FD, id->id_Buffer, id->id_Chunk);
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if (rbytes < 0) {
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LZMACloseFunc(fh);
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return rbytes;
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}
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if (rbytes > 0) {
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stream->next_in = id->id_Buffer;
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stream->avail_in = rbytes;
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id->id_Chunk = sizeof(id->id_Buffer);
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} else {
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(void)close(id->id_FD);
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id->id_FD = -1;
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}
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}
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stream->next_out = buffer;
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stream->avail_out = bytes;
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ret = lzma_code(stream,
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(stream->avail_in > 0) ? LZMA_RUN : LZMA_FINISH);
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rbytes = (ret == LZMA_OK || ret == LZMA_STREAM_END) ?
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(ssize_t)(bytes - stream->avail_out) : -1;
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if (ret != LZMA_OK)
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LZMACloseFunc(fh);
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return rbytes;
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}
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FileHandle *
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FileHandleLZMA(int *fd_p)
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{
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FileHandle *fh;
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InstData *id;
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off_t offset;
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fh = FileHandleCreate(LZMACloseFunc, LZMAReadFunc, sizeof(*id));
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if (fh == NULL)
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return NULL;
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id = fh->fh_InstData;
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if (lzma_auto_decoder(&id->id_Stream, 1U << 30,
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LZMA_CONCATENATED) != LZMA_OK) {
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fh->fh_InstData = NULL;
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FileHandleClose(fh);
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return NULL;
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}
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id->id_FD = *fd_p;
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*fd_p = -1;
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id->id_Chunk = sizeof(id->id_Buffer);
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offset = lseek(id->id_FD, 0, SEEK_CUR);
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if (offset != -1) {
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id->id_Chunk = sizeof(id->id_Buffer) -
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(size_t)offset % sizeof(id->id_Buffer);
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}
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return fh;
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}
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