1226184Sdelphij/* $NetBSD: unxz.c,v 1.5 2011/09/30 01:32:21 christos Exp $ */ 2226184Sdelphij 3226184Sdelphij/*- 4226184Sdelphij * Copyright (c) 2011 The NetBSD Foundation, Inc. 5226184Sdelphij * All rights reserved. 6226184Sdelphij * 7226184Sdelphij * This code is derived from software contributed to The NetBSD Foundation 8226184Sdelphij * by Christos Zoulas. 9226184Sdelphij * 10226184Sdelphij * Redistribution and use in source and binary forms, with or without 11226184Sdelphij * modification, are permitted provided that the following conditions 12226184Sdelphij * are met: 13226184Sdelphij * 1. Redistributions of source code must retain the above copyright 14226184Sdelphij * notice, this list of conditions and the following disclaimer. 15226184Sdelphij * 2. Redistributions in binary form must reproduce the above copyright 16226184Sdelphij * notice, this list of conditions and the following disclaimer in the 17226184Sdelphij * documentation and/or other materials provided with the distribution. 18226184Sdelphij * 19226184Sdelphij * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20226184Sdelphij * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21226184Sdelphij * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22226184Sdelphij * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23226184Sdelphij * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24226184Sdelphij * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25226184Sdelphij * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26226184Sdelphij * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27226184Sdelphij * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28226184Sdelphij * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29226184Sdelphij * POSSIBILITY OF SUCH DAMAGE. 30226184Sdelphij */ 31226184Sdelphij#include <sys/cdefs.h> 32226184Sdelphij__FBSDID("$FreeBSD$"); 33226184Sdelphij 34226184Sdelphij#include <stdarg.h> 35226184Sdelphij#include <errno.h> 36226184Sdelphij#include <stdio.h> 37226184Sdelphij#include <unistd.h> 38226184Sdelphij#include <lzma.h> 39226184Sdelphij 40226184Sdelphijstatic off_t 41226184Sdelphijunxz(int i, int o, char *pre, size_t prelen, off_t *bytes_in) 42226184Sdelphij{ 43226184Sdelphij lzma_stream strm = LZMA_STREAM_INIT; 44226184Sdelphij static const int flags = LZMA_TELL_UNSUPPORTED_CHECK|LZMA_CONCATENATED; 45226184Sdelphij lzma_ret ret; 46226184Sdelphij lzma_action action = LZMA_RUN; 47226184Sdelphij off_t bytes_out, bp; 48226184Sdelphij uint8_t ibuf[BUFSIZ]; 49226184Sdelphij uint8_t obuf[BUFSIZ]; 50226184Sdelphij 51226184Sdelphij if (bytes_in == NULL) 52226184Sdelphij bytes_in = &bp; 53226184Sdelphij 54226184Sdelphij strm.next_in = ibuf; 55226184Sdelphij memcpy(ibuf, pre, prelen); 56226184Sdelphij strm.avail_in = read(i, ibuf + prelen, sizeof(ibuf) - prelen); 57226184Sdelphij if (strm.avail_in == (size_t)-1) 58226184Sdelphij maybe_err("read failed"); 59226184Sdelphij strm.avail_in += prelen; 60226184Sdelphij *bytes_in = strm.avail_in; 61226184Sdelphij 62226184Sdelphij if ((ret = lzma_stream_decoder(&strm, UINT64_MAX, flags)) != LZMA_OK) 63226184Sdelphij maybe_errx("Can't initialize decoder (%d)", ret); 64226184Sdelphij 65226184Sdelphij strm.next_out = NULL; 66226184Sdelphij strm.avail_out = 0; 67226184Sdelphij if ((ret = lzma_code(&strm, LZMA_RUN)) != LZMA_OK) 68226184Sdelphij maybe_errx("Can't read headers (%d)", ret); 69226184Sdelphij 70226184Sdelphij bytes_out = 0; 71226184Sdelphij strm.next_out = obuf; 72226184Sdelphij strm.avail_out = sizeof(obuf); 73226184Sdelphij 74226184Sdelphij for (;;) { 75226184Sdelphij if (strm.avail_in == 0) { 76226184Sdelphij strm.next_in = ibuf; 77226184Sdelphij strm.avail_in = read(i, ibuf, sizeof(ibuf)); 78226184Sdelphij switch (strm.avail_in) { 79226184Sdelphij case (size_t)-1: 80226184Sdelphij maybe_err("read failed"); 81226184Sdelphij /*NOTREACHED*/ 82226184Sdelphij case 0: 83226184Sdelphij action = LZMA_FINISH; 84226184Sdelphij break; 85226184Sdelphij default: 86226184Sdelphij *bytes_in += strm.avail_in; 87226184Sdelphij break; 88226184Sdelphij } 89226184Sdelphij } 90226184Sdelphij 91226184Sdelphij ret = lzma_code(&strm, action); 92226184Sdelphij 93226184Sdelphij // Write and check write error before checking decoder error. 94226184Sdelphij // This way as much data as possible gets written to output 95226184Sdelphij // even if decoder detected an error. 96226184Sdelphij if (strm.avail_out == 0 || ret != LZMA_OK) { 97226184Sdelphij const size_t write_size = sizeof(obuf) - strm.avail_out; 98226184Sdelphij 99226184Sdelphij if (write(o, obuf, write_size) != (ssize_t)write_size) 100226184Sdelphij maybe_err("write failed"); 101226184Sdelphij 102226184Sdelphij strm.next_out = obuf; 103226184Sdelphij strm.avail_out = sizeof(obuf); 104226184Sdelphij bytes_out += write_size; 105226184Sdelphij } 106226184Sdelphij 107226184Sdelphij if (ret != LZMA_OK) { 108226184Sdelphij if (ret == LZMA_STREAM_END) { 109226184Sdelphij // Check that there's no trailing garbage. 110226184Sdelphij if (strm.avail_in != 0 || read(i, ibuf, 1)) 111226184Sdelphij ret = LZMA_DATA_ERROR; 112226184Sdelphij else { 113226184Sdelphij lzma_end(&strm); 114226184Sdelphij return bytes_out; 115226184Sdelphij } 116226184Sdelphij } 117226184Sdelphij 118226184Sdelphij const char *msg; 119226184Sdelphij switch (ret) { 120226184Sdelphij case LZMA_MEM_ERROR: 121226184Sdelphij msg = strerror(ENOMEM); 122226184Sdelphij break; 123226184Sdelphij 124226184Sdelphij case LZMA_FORMAT_ERROR: 125226184Sdelphij msg = "File format not recognized"; 126226184Sdelphij break; 127226184Sdelphij 128226184Sdelphij case LZMA_OPTIONS_ERROR: 129226184Sdelphij // FIXME: Better message? 130226184Sdelphij msg = "Unsupported compression options"; 131226184Sdelphij break; 132226184Sdelphij 133226184Sdelphij case LZMA_DATA_ERROR: 134226184Sdelphij msg = "File is corrupt"; 135226184Sdelphij break; 136226184Sdelphij 137226184Sdelphij case LZMA_BUF_ERROR: 138226184Sdelphij msg = "Unexpected end of input"; 139226184Sdelphij break; 140226184Sdelphij 141226184Sdelphij case LZMA_MEMLIMIT_ERROR: 142226184Sdelphij msg = "Reached memory limit"; 143226184Sdelphij break; 144226184Sdelphij 145226184Sdelphij default: 146226184Sdelphij maybe_errx("Unknown error (%d)", ret); 147226184Sdelphij break; 148226184Sdelphij } 149226184Sdelphij maybe_errx("%s", msg); 150226184Sdelphij 151226184Sdelphij } 152226184Sdelphij } 153226184Sdelphij} 154