archive_write_add_filter_zstd.c revision 358088
1/*- 2 * Copyright (c) 2017 Sean Purcell 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "archive_platform.h" 27 28__FBSDID("$FreeBSD: stable/11/contrib/libarchive/libarchive/archive_write_add_filter_zstd.c 358088 2020-02-19 01:50:47Z mm $"); 29 30 31#ifdef HAVE_ERRNO_H 32#include <errno.h> 33#endif 34#ifdef HAVE_STDLIB_H 35#include <stdlib.h> 36#endif 37#ifdef HAVE_STRING_H 38#include <string.h> 39#endif 40#ifdef HAVE_ZSTD_H 41#include <zstd.h> 42#endif 43 44#include "archive.h" 45#include "archive_private.h" 46#include "archive_string.h" 47#include "archive_write_private.h" 48 49/* Don't compile this if we don't have zstd.h */ 50 51struct private_data { 52 int compression_level; 53#if HAVE_ZSTD_H && HAVE_LIBZSTD 54 ZSTD_CStream *cstream; 55 int64_t total_in; 56 ZSTD_outBuffer out; 57#else 58 struct archive_write_program_data *pdata; 59#endif 60}; 61 62static int archive_compressor_zstd_options(struct archive_write_filter *, 63 const char *, const char *); 64static int archive_compressor_zstd_open(struct archive_write_filter *); 65static int archive_compressor_zstd_write(struct archive_write_filter *, 66 const void *, size_t); 67static int archive_compressor_zstd_close(struct archive_write_filter *); 68static int archive_compressor_zstd_free(struct archive_write_filter *); 69#if HAVE_ZSTD_H && HAVE_LIBZSTD 70static int drive_compressor(struct archive_write_filter *, 71 struct private_data *, int, const void *, size_t); 72#endif 73 74 75/* 76 * Add a zstd compression filter to this write handle. 77 */ 78int 79archive_write_add_filter_zstd(struct archive *_a) 80{ 81 struct archive_write *a = (struct archive_write *)_a; 82 struct archive_write_filter *f = __archive_write_allocate_filter(_a); 83 struct private_data *data; 84 archive_check_magic(&a->archive, ARCHIVE_WRITE_MAGIC, 85 ARCHIVE_STATE_NEW, "archive_write_add_filter_zstd"); 86 87 data = calloc(1, sizeof(*data)); 88 if (data == NULL) { 89 archive_set_error(&a->archive, ENOMEM, "Out of memory"); 90 return (ARCHIVE_FATAL); 91 } 92 f->data = data; 93 f->open = &archive_compressor_zstd_open; 94 f->options = &archive_compressor_zstd_options; 95 f->close = &archive_compressor_zstd_close; 96 f->free = &archive_compressor_zstd_free; 97 f->code = ARCHIVE_FILTER_ZSTD; 98 f->name = "zstd"; 99 data->compression_level = 3; /* Default level used by the zstd CLI */ 100#if HAVE_ZSTD_H && HAVE_LIBZSTD 101 data->cstream = ZSTD_createCStream(); 102 if (data->cstream == NULL) { 103 free(data); 104 archive_set_error(&a->archive, ENOMEM, 105 "Failed to allocate zstd compressor object"); 106 return (ARCHIVE_FATAL); 107 } 108 109 return (ARCHIVE_OK); 110#else 111 data->pdata = __archive_write_program_allocate("zstd"); 112 if (data->pdata == NULL) { 113 free(data); 114 archive_set_error(&a->archive, ENOMEM, "Out of memory"); 115 return (ARCHIVE_FATAL); 116 } 117 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 118 "Using external zstd program"); 119 return (ARCHIVE_WARN); 120#endif 121} 122 123static int 124archive_compressor_zstd_free(struct archive_write_filter *f) 125{ 126 struct private_data *data = (struct private_data *)f->data; 127#if HAVE_ZSTD_H && HAVE_LIBZSTD 128 ZSTD_freeCStream(data->cstream); 129 free(data->out.dst); 130#else 131 __archive_write_program_free(data->pdata); 132#endif 133 free(data); 134 f->data = NULL; 135 return (ARCHIVE_OK); 136} 137 138/* 139 * Set write options. 140 */ 141static int 142archive_compressor_zstd_options(struct archive_write_filter *f, const char *key, 143 const char *value) 144{ 145 struct private_data *data = (struct private_data *)f->data; 146 147 if (strcmp(key, "compression-level") == 0) { 148 int level = atoi(value); 149#if HAVE_ZSTD_H && HAVE_LIBZSTD 150 if (level < 1 || level > ZSTD_maxCLevel()) { 151#else 152 /* If we don't have the library, hard-code the max level */ 153 if (level < 1 || level > 22) { 154#endif 155 return (ARCHIVE_WARN); 156 } 157 data->compression_level = level; 158 return (ARCHIVE_OK); 159 } 160 161 /* Note: The "warn" return is just to inform the options 162 * supervisor that we didn't handle it. It will generate 163 * a suitable error if no one used this option. */ 164 return (ARCHIVE_WARN); 165} 166 167#if HAVE_ZSTD_H && HAVE_LIBZSTD 168/* 169 * Setup callback. 170 */ 171static int 172archive_compressor_zstd_open(struct archive_write_filter *f) 173{ 174 struct private_data *data = (struct private_data *)f->data; 175 176 if (data->out.dst == NULL) { 177 size_t bs = ZSTD_CStreamOutSize(), bpb; 178 if (f->archive->magic == ARCHIVE_WRITE_MAGIC) { 179 /* Buffer size should be a multiple number of 180 * the of bytes per block for performance. */ 181 bpb = archive_write_get_bytes_per_block(f->archive); 182 if (bpb > bs) 183 bs = bpb; 184 else if (bpb != 0) 185 bs -= bs % bpb; 186 } 187 data->out.size = bs; 188 data->out.pos = 0; 189 data->out.dst 190 = (unsigned char *)malloc(data->out.size); 191 if (data->out.dst == NULL) { 192 archive_set_error(f->archive, ENOMEM, 193 "Can't allocate data for compression buffer"); 194 return (ARCHIVE_FATAL); 195 } 196 } 197 198 f->write = archive_compressor_zstd_write; 199 200 if (ZSTD_isError(ZSTD_initCStream(data->cstream, 201 data->compression_level))) { 202 archive_set_error(f->archive, ARCHIVE_ERRNO_MISC, 203 "Internal error initializing zstd compressor object"); 204 return (ARCHIVE_FATAL); 205 } 206 207 return (ARCHIVE_OK); 208} 209 210/* 211 * Write data to the compressed stream. 212 */ 213static int 214archive_compressor_zstd_write(struct archive_write_filter *f, const void *buff, 215 size_t length) 216{ 217 struct private_data *data = (struct private_data *)f->data; 218 int ret; 219 220 /* Update statistics */ 221 data->total_in += length; 222 223 if ((ret = drive_compressor(f, data, 0, buff, length)) != ARCHIVE_OK) 224 return (ret); 225 226 return (ARCHIVE_OK); 227} 228 229/* 230 * Finish the compression... 231 */ 232static int 233archive_compressor_zstd_close(struct archive_write_filter *f) 234{ 235 struct private_data *data = (struct private_data *)f->data; 236 237 /* Finish zstd frame */ 238 return drive_compressor(f, data, 1, NULL, 0); 239} 240 241/* 242 * Utility function to push input data through compressor, 243 * writing full output blocks as necessary. 244 * 245 * Note that this handles both the regular write case (finishing == 246 * false) and the end-of-archive case (finishing == true). 247 */ 248static int 249drive_compressor(struct archive_write_filter *f, 250 struct private_data *data, int finishing, const void *src, size_t length) 251{ 252 ZSTD_inBuffer in = (ZSTD_inBuffer) { src, length, 0 }; 253 254 for (;;) { 255 if (data->out.pos == data->out.size) { 256 const int ret = __archive_write_filter(f->next_filter, 257 data->out.dst, data->out.size); 258 if (ret != ARCHIVE_OK) 259 return (ARCHIVE_FATAL); 260 data->out.pos = 0; 261 } 262 263 /* If there's nothing to do, we're done. */ 264 if (!finishing && in.pos == in.size) 265 return (ARCHIVE_OK); 266 267 { 268 const size_t zstdret = !finishing ? 269 ZSTD_compressStream(data->cstream, &data->out, &in) 270 : ZSTD_endStream(data->cstream, &data->out); 271 272 if (ZSTD_isError(zstdret)) { 273 archive_set_error(f->archive, 274 ARCHIVE_ERRNO_MISC, 275 "Zstd compression failed: %s", 276 ZSTD_getErrorName(zstdret)); 277 return (ARCHIVE_FATAL); 278 } 279 280 /* If we're finishing, 0 means nothing left to flush */ 281 if (finishing && zstdret == 0) { 282 const int ret = __archive_write_filter(f->next_filter, 283 data->out.dst, data->out.pos); 284 return (ret); 285 } 286 } 287 } 288} 289 290#else /* HAVE_ZSTD_H && HAVE_LIBZSTD */ 291 292static int 293archive_compressor_zstd_open(struct archive_write_filter *f) 294{ 295 struct private_data *data = (struct private_data *)f->data; 296 struct archive_string as; 297 int r; 298 299 archive_string_init(&as); 300 archive_string_sprintf(&as, "zstd -%d", data->compression_level); 301 302 f->write = archive_compressor_zstd_write; 303 r = __archive_write_program_open(f, data->pdata, as.s); 304 archive_string_free(&as); 305 return (r); 306} 307 308static int 309archive_compressor_zstd_write(struct archive_write_filter *f, const void *buff, 310 size_t length) 311{ 312 struct private_data *data = (struct private_data *)f->data; 313 314 return __archive_write_program_write(f, data->pdata, buff, length); 315} 316 317static int 318archive_compressor_zstd_close(struct archive_write_filter *f) 319{ 320 struct private_data *data = (struct private_data *)f->data; 321 322 return __archive_write_program_close(f, data->pdata); 323} 324 325#endif /* HAVE_ZSTD_H && HAVE_LIBZSTD */ 326