1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2022 Klara, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 /* This file is #included by gzip.c */ 29 30 static off_t 31 unzstd(int in, int out, char *pre, size_t prelen, off_t *bytes_in) 32 { 33 static char *ibuf, *obuf; 34 ZSTD_inBuffer zib; 35 ZSTD_outBuffer zob; 36 ZSTD_DCtx *zds; 37 ssize_t res; 38 size_t zres; 39 size_t bytes_out = 0; 40 int eof = 0; 41 42 if (ibuf == NULL) 43 ibuf = malloc(BUFLEN); 44 if (obuf == NULL) 45 obuf = malloc(BUFLEN); 46 if (ibuf == NULL || obuf == NULL) 47 maybe_err("malloc"); 48 49 zds = ZSTD_createDStream(); 50 ZSTD_initDStream(zds); 51 52 zib.src = pre; 53 zib.size = prelen; 54 zib.pos = 0; 55 if (bytes_in != NULL) 56 *bytes_in = prelen; 57 zob.dst = obuf; 58 zob.size = BUFLEN; 59 zob.pos = 0; 60 61 while (!eof) { 62 if (zib.pos >= zib.size) { 63 res = read(in, ibuf, BUFLEN); 64 if (res < 0) 65 maybe_err("read"); 66 if (res == 0) 67 eof = 1; 68 infile_newdata(res); 69 zib.src = ibuf; 70 zib.size = res; 71 zib.pos = 0; 72 if (bytes_in != NULL) 73 *bytes_in += res; 74 } 75 zres = ZSTD_decompressStream(zds, &zob, &zib); 76 if (ZSTD_isError(zres)) { 77 maybe_errx("%s", ZSTD_getErrorName(zres)); 78 } 79 if (zob.pos > 0) { 80 res = write(out, obuf, zob.pos); 81 if (res < 0) 82 maybe_err("write"); 83 zob.pos = 0; 84 bytes_out += res; 85 } 86 } 87 ZSTD_freeDStream(zds); 88 return (bytes_out); 89 } 90