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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
e4e61fdb | 2 | |
82e24b00 | 3 | #include <inttypes.h> |
319a4f4b | 4 | #include <malloc.h> |
e4e61fdb | 5 | #include <stdlib.h> |
4b5bc539 | 6 | #include <sys/mman.h> |
ca78ad1d | 7 | #include <sys/stat.h> |
319a4f4b | 8 | #include <sys/types.h> |
07630cea | 9 | #include <unistd.h> |
d89c8fdf | 10 | |
349cc4a5 | 11 | #if HAVE_XZ |
3ffd4af2 | 12 | #include <lzma.h> |
d89c8fdf ZJS |
13 | #endif |
14 | ||
349cc4a5 | 15 | #if HAVE_LZ4 |
3ffd4af2 LP |
16 | #include <lz4.h> |
17 | #include <lz4frame.h> | |
d89c8fdf | 18 | #endif |
e4e61fdb | 19 | |
ef5924aa NL |
20 | #if HAVE_ZSTD |
21 | #include <zstd.h> | |
22 | #include <zstd_errors.h> | |
23 | #endif | |
24 | ||
b5efdb8a | 25 | #include "alloc-util.h" |
e4e61fdb | 26 | #include "compress.h" |
3ffd4af2 | 27 | #include "fd-util.h" |
1a823cde | 28 | #include "fileio.h" |
c004493c | 29 | #include "io-util.h" |
355b59e2 | 30 | #include "macro.h" |
d89c8fdf | 31 | #include "sparse-endian.h" |
8b43440b | 32 | #include "string-table.h" |
07630cea | 33 | #include "string-util.h" |
4094c4bf | 34 | #include "unaligned.h" |
d89c8fdf | 35 | |
349cc4a5 | 36 | #if HAVE_LZ4 |
fd421c4a ZJS |
37 | DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(LZ4F_compressionContext_t, LZ4F_freeCompressionContext, NULL); |
38 | DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(LZ4F_decompressionContext_t, LZ4F_freeDecompressionContext, NULL); | |
4b5bc539 ZJS |
39 | #endif |
40 | ||
ef5924aa | 41 | #if HAVE_ZSTD |
fd421c4a ZJS |
42 | DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(ZSTD_CCtx*, ZSTD_freeCCtx, NULL); |
43 | DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(ZSTD_DCtx*, ZSTD_freeDCtx, NULL); | |
ef5924aa NL |
44 | |
45 | static int zstd_ret_to_errno(size_t ret) { | |
46 | switch (ZSTD_getErrorCode(ret)) { | |
47 | case ZSTD_error_dstSize_tooSmall: | |
48 | return -ENOBUFS; | |
49 | case ZSTD_error_memory_allocation: | |
50 | return -ENOMEM; | |
51 | default: | |
52 | return -EBADMSG; | |
53 | } | |
54 | } | |
55 | #endif | |
56 | ||
d89c8fdf ZJS |
57 | #define ALIGN_8(l) ALIGN_TO(l, sizeof(size_t)) |
58 | ||
acc50c92 | 59 | static const char* const compression_table[_COMPRESSION_MAX] = { |
4d698d12 | 60 | [COMPRESSION_NONE] = "NONE", |
acc50c92 LP |
61 | [COMPRESSION_XZ] = "XZ", |
62 | [COMPRESSION_LZ4] = "LZ4", | |
63 | [COMPRESSION_ZSTD] = "ZSTD", | |
d89c8fdf | 64 | }; |
e4e61fdb | 65 | |
acc50c92 | 66 | DEFINE_STRING_TABLE_LOOKUP(compression, Compression); |
d89c8fdf | 67 | |
5d6f46b6 ZJS |
68 | int compress_blob_xz(const void *src, uint64_t src_size, |
69 | void *dst, size_t dst_alloc_size, size_t *dst_size) { | |
349cc4a5 | 70 | #if HAVE_XZ |
1930eed2 JS |
71 | static const lzma_options_lzma opt = { |
72 | 1u << 20u, NULL, 0, LZMA_LC_DEFAULT, LZMA_LP_DEFAULT, | |
0240c603 LP |
73 | LZMA_PB_DEFAULT, LZMA_MODE_FAST, 128, LZMA_MF_HC3, 4 |
74 | }; | |
75 | static const lzma_filter filters[] = { | |
76 | { LZMA_FILTER_LZMA2, (lzma_options_lzma*) &opt }, | |
77 | { LZMA_VLI_UNKNOWN, NULL } | |
1930eed2 | 78 | }; |
e4e61fdb | 79 | lzma_ret ret; |
76cc0bf6 | 80 | size_t out_pos = 0; |
e4e61fdb LP |
81 | |
82 | assert(src); | |
83 | assert(src_size > 0); | |
84 | assert(dst); | |
5d6f46b6 | 85 | assert(dst_alloc_size > 0); |
e4e61fdb LP |
86 | assert(dst_size); |
87 | ||
d89c8fdf | 88 | /* Returns < 0 if we couldn't compress the data or the |
e4e61fdb LP |
89 | * compressed result is longer than the original */ |
90 | ||
1930eed2 JS |
91 | if (src_size < 80) |
92 | return -ENOBUFS; | |
93 | ||
94 | ret = lzma_stream_buffer_encode((lzma_filter*) filters, LZMA_CHECK_NONE, NULL, | |
5d6f46b6 | 95 | src, src_size, dst, &out_pos, dst_alloc_size); |
e4e61fdb | 96 | if (ret != LZMA_OK) |
d89c8fdf | 97 | return -ENOBUFS; |
e4e61fdb | 98 | |
76cc0bf6 | 99 | *dst_size = out_pos; |
acc50c92 | 100 | return COMPRESSION_XZ; |
d89c8fdf ZJS |
101 | #else |
102 | return -EPROTONOSUPPORT; | |
103 | #endif | |
e4e61fdb LP |
104 | } |
105 | ||
5d6f46b6 ZJS |
106 | int compress_blob_lz4(const void *src, uint64_t src_size, |
107 | void *dst, size_t dst_alloc_size, size_t *dst_size) { | |
349cc4a5 | 108 | #if HAVE_LZ4 |
d89c8fdf ZJS |
109 | int r; |
110 | ||
111 | assert(src); | |
112 | assert(src_size > 0); | |
113 | assert(dst); | |
5d6f46b6 | 114 | assert(dst_alloc_size > 0); |
d89c8fdf ZJS |
115 | assert(dst_size); |
116 | ||
117 | /* Returns < 0 if we couldn't compress the data or the | |
118 | * compressed result is longer than the original */ | |
119 | ||
120 | if (src_size < 9) | |
121 | return -ENOBUFS; | |
e4e61fdb | 122 | |
691b90d4 | 123 | r = LZ4_compress_default(src, (char*)dst + 8, src_size, (int) dst_alloc_size - 8); |
d89c8fdf ZJS |
124 | if (r <= 0) |
125 | return -ENOBUFS; | |
126 | ||
4094c4bf | 127 | unaligned_write_le64(dst, src_size); |
d89c8fdf ZJS |
128 | *dst_size = r + 8; |
129 | ||
acc50c92 | 130 | return COMPRESSION_LZ4; |
d89c8fdf ZJS |
131 | #else |
132 | return -EPROTONOSUPPORT; | |
133 | #endif | |
134 | } | |
135 | ||
8653185a LP |
136 | int compress_blob_zstd( |
137 | const void *src, uint64_t src_size, | |
138 | void *dst, size_t dst_alloc_size, size_t *dst_size) { | |
139 | #if HAVE_ZSTD | |
140 | size_t k; | |
141 | ||
142 | assert(src); | |
143 | assert(src_size > 0); | |
144 | assert(dst); | |
145 | assert(dst_alloc_size > 0); | |
146 | assert(dst_size); | |
147 | ||
148 | k = ZSTD_compress(dst, dst_alloc_size, src, src_size, 0); | |
149 | if (ZSTD_isError(k)) | |
150 | return zstd_ret_to_errno(k); | |
151 | ||
152 | *dst_size = k; | |
acc50c92 | 153 | return COMPRESSION_ZSTD; |
8653185a LP |
154 | #else |
155 | return -EPROTONOSUPPORT; | |
156 | #endif | |
157 | } | |
158 | ||
319a4f4b LP |
159 | int decompress_blob_xz( |
160 | const void *src, | |
161 | uint64_t src_size, | |
162 | void **dst, | |
163 | size_t* dst_size, | |
164 | size_t dst_max) { | |
d89c8fdf | 165 | |
349cc4a5 | 166 | #if HAVE_XZ |
5e592c66 | 167 | _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
e4e61fdb | 168 | lzma_ret ret; |
fa1c4b51 | 169 | size_t space; |
e4e61fdb LP |
170 | |
171 | assert(src); | |
172 | assert(src_size > 0); | |
173 | assert(dst); | |
e4e61fdb | 174 | assert(dst_size); |
e4e61fdb LP |
175 | |
176 | ret = lzma_stream_decoder(&s, UINT64_MAX, 0); | |
177 | if (ret != LZMA_OK) | |
d89c8fdf | 178 | return -ENOMEM; |
e4e61fdb | 179 | |
f5fbe71d | 180 | space = MIN(src_size * 2, dst_max ?: SIZE_MAX); |
319a4f4b | 181 | if (!greedy_realloc(dst, space, 1)) |
01c3322e | 182 | return -ENOMEM; |
e4e61fdb LP |
183 | |
184 | s.next_in = src; | |
185 | s.avail_in = src_size; | |
186 | ||
187 | s.next_out = *dst; | |
93b73b06 | 188 | s.avail_out = space; |
e4e61fdb LP |
189 | |
190 | for (;;) { | |
fa1c4b51 | 191 | size_t used; |
e4e61fdb LP |
192 | |
193 | ret = lzma_code(&s, LZMA_FINISH); | |
194 | ||
195 | if (ret == LZMA_STREAM_END) | |
196 | break; | |
d89c8fdf ZJS |
197 | else if (ret != LZMA_OK) |
198 | return -ENOMEM; | |
e4e61fdb | 199 | |
93b73b06 LP |
200 | if (dst_max > 0 && (space - s.avail_out) >= dst_max) |
201 | break; | |
d89c8fdf ZJS |
202 | else if (dst_max > 0 && space == dst_max) |
203 | return -ENOBUFS; | |
93b73b06 | 204 | |
5e592c66 | 205 | used = space - s.avail_out; |
f5fbe71d | 206 | space = MIN(2 * space, dst_max ?: SIZE_MAX); |
319a4f4b | 207 | if (!greedy_realloc(dst, space, 1)) |
01c3322e | 208 | return -ENOMEM; |
e4e61fdb | 209 | |
5e592c66 | 210 | s.avail_out = space - used; |
8e170d29 | 211 | s.next_out = *(uint8_t**)dst + used; |
e4e61fdb LP |
212 | } |
213 | ||
93b73b06 | 214 | *dst_size = space - s.avail_out; |
d89c8fdf ZJS |
215 | return 0; |
216 | #else | |
217 | return -EPROTONOSUPPORT; | |
218 | #endif | |
e4e61fdb LP |
219 | } |
220 | ||
319a4f4b LP |
221 | int decompress_blob_lz4( |
222 | const void *src, | |
223 | uint64_t src_size, | |
224 | void **dst, | |
225 | size_t* dst_size, | |
226 | size_t dst_max) { | |
d89c8fdf | 227 | |
349cc4a5 | 228 | #if HAVE_LZ4 |
d89c8fdf | 229 | char* out; |
fa1c4b51 | 230 | int r, size; /* LZ4 uses int for size */ |
e4e61fdb | 231 | |
d89c8fdf ZJS |
232 | assert(src); |
233 | assert(src_size > 0); | |
234 | assert(dst); | |
d89c8fdf | 235 | assert(dst_size); |
d89c8fdf ZJS |
236 | |
237 | if (src_size <= 8) | |
238 | return -EBADMSG; | |
239 | ||
4094c4bf LP |
240 | size = unaligned_read_le64(src); |
241 | if (size < 0 || (unsigned) size != unaligned_read_le64(src)) | |
fa1c4b51 | 242 | return -EFBIG; |
319a4f4b LP |
243 | out = greedy_realloc(dst, size, 1); |
244 | if (!out) | |
245 | return -ENOMEM; | |
d89c8fdf | 246 | |
8e170d29 | 247 | r = LZ4_decompress_safe((char*)src + 8, out, src_size - 8, size); |
fa1c4b51 | 248 | if (r < 0 || r != size) |
d89c8fdf ZJS |
249 | return -EBADMSG; |
250 | ||
251 | *dst_size = size; | |
252 | return 0; | |
253 | #else | |
254 | return -EPROTONOSUPPORT; | |
255 | #endif | |
256 | } | |
257 | ||
8653185a | 258 | int decompress_blob_zstd( |
319a4f4b LP |
259 | const void *src, |
260 | uint64_t src_size, | |
261 | void **dst, | |
262 | size_t *dst_size, | |
263 | size_t dst_max) { | |
8653185a LP |
264 | |
265 | #if HAVE_ZSTD | |
a2415327 | 266 | uint64_t size; |
8653185a LP |
267 | |
268 | assert(src); | |
269 | assert(src_size > 0); | |
270 | assert(dst); | |
8653185a | 271 | assert(dst_size); |
8653185a | 272 | |
a2415327 ZJS |
273 | size = ZSTD_getFrameContentSize(src, src_size); |
274 | if (IN_SET(size, ZSTD_CONTENTSIZE_ERROR, ZSTD_CONTENTSIZE_UNKNOWN)) | |
275 | return -EBADMSG; | |
8653185a | 276 | |
a2415327 ZJS |
277 | if (dst_max > 0 && size > dst_max) |
278 | size = dst_max; | |
279 | if (size > SIZE_MAX) | |
280 | return -E2BIG; | |
8653185a | 281 | |
319a4f4b | 282 | if (!(greedy_realloc(dst, MAX(ZSTD_DStreamOutSize(), size), 1))) |
a2415327 | 283 | return -ENOMEM; |
8653185a | 284 | |
a2415327 ZJS |
285 | _cleanup_(ZSTD_freeDCtxp) ZSTD_DCtx *dctx = ZSTD_createDCtx(); |
286 | if (!dctx) | |
287 | return -ENOMEM; | |
8653185a | 288 | |
a2415327 ZJS |
289 | ZSTD_inBuffer input = { |
290 | .src = src, | |
291 | .size = src_size, | |
292 | }; | |
293 | ZSTD_outBuffer output = { | |
294 | .dst = *dst, | |
319a4f4b | 295 | .size = MALLOC_SIZEOF_SAFE(*dst), |
a2415327 | 296 | }; |
8653185a | 297 | |
a2415327 ZJS |
298 | size_t k = ZSTD_decompressStream(dctx, &output, &input); |
299 | if (ZSTD_isError(k)) { | |
300 | log_debug("ZSTD decoder failed: %s", ZSTD_getErrorName(k)); | |
301 | return zstd_ret_to_errno(k); | |
8653185a | 302 | } |
a2415327 ZJS |
303 | assert(output.pos >= size); |
304 | ||
305 | *dst_size = size; | |
306 | return 0; | |
8653185a LP |
307 | #else |
308 | return -EPROTONOSUPPORT; | |
309 | #endif | |
310 | } | |
311 | ||
312 | int decompress_blob( | |
acc50c92 | 313 | Compression compression, |
319a4f4b LP |
314 | const void *src, |
315 | uint64_t src_size, | |
316 | void **dst, | |
317 | size_t* dst_size, | |
318 | size_t dst_max) { | |
8653185a | 319 | |
acc50c92 | 320 | if (compression == COMPRESSION_XZ) |
8653185a LP |
321 | return decompress_blob_xz( |
322 | src, src_size, | |
319a4f4b | 323 | dst, dst_size, dst_max); |
acc50c92 | 324 | else if (compression == COMPRESSION_LZ4) |
8653185a LP |
325 | return decompress_blob_lz4( |
326 | src, src_size, | |
319a4f4b | 327 | dst, dst_size, dst_max); |
acc50c92 | 328 | else if (compression == COMPRESSION_ZSTD) |
8653185a LP |
329 | return decompress_blob_zstd( |
330 | src, src_size, | |
319a4f4b | 331 | dst, dst_size, dst_max); |
d89c8fdf | 332 | else |
b4a11ca3 | 333 | return -EPROTONOSUPPORT; |
d89c8fdf ZJS |
334 | } |
335 | ||
319a4f4b LP |
336 | int decompress_startswith_xz( |
337 | const void *src, | |
338 | uint64_t src_size, | |
339 | void **buffer, | |
340 | const void *prefix, | |
341 | size_t prefix_len, | |
342 | uint8_t extra) { | |
d89c8fdf | 343 | |
349cc4a5 | 344 | #if HAVE_XZ |
5e592c66 | 345 | _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
319a4f4b | 346 | size_t allocated; |
e4e61fdb | 347 | lzma_ret ret; |
e4e61fdb | 348 | |
319a4f4b LP |
349 | /* Checks whether the decompressed blob starts with the mentioned prefix. The byte extra needs to |
350 | * follow the prefix */ | |
e4e61fdb LP |
351 | |
352 | assert(src); | |
353 | assert(src_size > 0); | |
354 | assert(buffer); | |
e4e61fdb | 355 | assert(prefix); |
e4e61fdb LP |
356 | |
357 | ret = lzma_stream_decoder(&s, UINT64_MAX, 0); | |
358 | if (ret != LZMA_OK) | |
d89c8fdf | 359 | return -EBADMSG; |
e4e61fdb | 360 | |
319a4f4b | 361 | if (!(greedy_realloc(buffer, ALIGN_8(prefix_len + 1), 1))) |
d89c8fdf | 362 | return -ENOMEM; |
e4e61fdb | 363 | |
319a4f4b LP |
364 | allocated = MALLOC_SIZEOF_SAFE(*buffer); |
365 | ||
e4e61fdb LP |
366 | s.next_in = src; |
367 | s.avail_in = src_size; | |
368 | ||
369 | s.next_out = *buffer; | |
319a4f4b | 370 | s.avail_out = allocated; |
e4e61fdb LP |
371 | |
372 | for (;;) { | |
e4e61fdb LP |
373 | ret = lzma_code(&s, LZMA_FINISH); |
374 | ||
4c701096 | 375 | if (!IN_SET(ret, LZMA_OK, LZMA_STREAM_END)) |
d89c8fdf | 376 | return -EBADMSG; |
e4e61fdb | 377 | |
319a4f4b | 378 | if (allocated - s.avail_out >= prefix_len + 1) |
5e592c66 ZJS |
379 | return memcmp(*buffer, prefix, prefix_len) == 0 && |
380 | ((const uint8_t*) *buffer)[prefix_len] == extra; | |
e4e61fdb LP |
381 | |
382 | if (ret == LZMA_STREAM_END) | |
d89c8fdf | 383 | return 0; |
e4e61fdb | 384 | |
319a4f4b | 385 | s.avail_out += allocated; |
e4e61fdb | 386 | |
319a4f4b | 387 | if (!(greedy_realloc(buffer, allocated * 2, 1))) |
d89c8fdf | 388 | return -ENOMEM; |
e4e61fdb | 389 | |
319a4f4b LP |
390 | allocated = MALLOC_SIZEOF_SAFE(*buffer); |
391 | s.next_out = *(uint8_t**)buffer + allocated - s.avail_out; | |
5e592c66 | 392 | } |
d89c8fdf ZJS |
393 | |
394 | #else | |
395 | return -EPROTONOSUPPORT; | |
396 | #endif | |
397 | } | |
398 | ||
319a4f4b LP |
399 | int decompress_startswith_lz4( |
400 | const void *src, | |
401 | uint64_t src_size, | |
402 | void **buffer, | |
403 | const void *prefix, | |
404 | size_t prefix_len, | |
405 | uint8_t extra) { | |
406 | ||
349cc4a5 | 407 | #if HAVE_LZ4 |
319a4f4b LP |
408 | /* Checks whether the decompressed blob starts with the mentioned prefix. The byte extra needs to |
409 | * follow the prefix */ | |
d89c8fdf | 410 | |
319a4f4b | 411 | size_t allocated; |
d89c8fdf ZJS |
412 | int r; |
413 | ||
414 | assert(src); | |
415 | assert(src_size > 0); | |
416 | assert(buffer); | |
d89c8fdf | 417 | assert(prefix); |
d89c8fdf ZJS |
418 | |
419 | if (src_size <= 8) | |
420 | return -EBADMSG; | |
421 | ||
319a4f4b | 422 | if (!(greedy_realloc(buffer, ALIGN_8(prefix_len + 1), 1))) |
d89c8fdf | 423 | return -ENOMEM; |
319a4f4b LP |
424 | allocated = MALLOC_SIZEOF_SAFE(*buffer); |
425 | ||
426 | r = LZ4_decompress_safe_partial( | |
427 | (char*)src + 8, | |
428 | *buffer, | |
429 | src_size - 8, | |
430 | prefix_len + 1, | |
431 | allocated); | |
432 | ||
433 | /* One lz4 < 1.8.3, we might get "failure" (r < 0), or "success" where just a part of the buffer is | |
434 | * decompressed. But if we get a smaller amount of bytes than requested, we don't know whether there | |
435 | * isn't enough data to fill the requested size or whether we just got a partial answer. | |
e41ef6fd ZJS |
436 | */ |
437 | if (r < 0 || (size_t) r < prefix_len + 1) { | |
438 | size_t size; | |
439 | ||
440 | if (LZ4_versionNumber() >= 10803) | |
441 | /* We trust that the newer lz4 decompresses the number of bytes we | |
442 | * requested if available in the compressed string. */ | |
443 | return 0; | |
444 | ||
445 | if (r > 0) | |
446 | /* Compare what we have first, in case of mismatch we can | |
447 | * shortcut the full comparison. */ | |
448 | if (memcmp(*buffer, prefix, r) != 0) | |
449 | return 0; | |
450 | ||
451 | /* Before version 1.8.3, lz4 always tries to decode full a "sequence", | |
452 | * so in pathological cases might need to decompress the full field. */ | |
319a4f4b | 453 | r = decompress_blob_lz4(src, src_size, buffer, &size, 0); |
1f4b467d ZJS |
454 | if (r < 0) |
455 | return r; | |
d89c8fdf | 456 | |
e41ef6fd ZJS |
457 | if (size < prefix_len + 1) |
458 | return 0; | |
459 | } | |
d89c8fdf | 460 | |
e41ef6fd ZJS |
461 | return memcmp(*buffer, prefix, prefix_len) == 0 && |
462 | ((const uint8_t*) *buffer)[prefix_len] == extra; | |
d89c8fdf ZJS |
463 | #else |
464 | return -EPROTONOSUPPORT; | |
465 | #endif | |
e4e61fdb | 466 | } |
355b59e2 | 467 | |
8653185a | 468 | int decompress_startswith_zstd( |
319a4f4b LP |
469 | const void *src, |
470 | uint64_t src_size, | |
471 | void **buffer, | |
472 | const void *prefix, | |
473 | size_t prefix_len, | |
8653185a LP |
474 | uint8_t extra) { |
475 | #if HAVE_ZSTD | |
8653185a LP |
476 | assert(src); |
477 | assert(src_size > 0); | |
478 | assert(buffer); | |
8653185a | 479 | assert(prefix); |
8653185a | 480 | |
e4a321fc ZJS |
481 | uint64_t size = ZSTD_getFrameContentSize(src, src_size); |
482 | if (IN_SET(size, ZSTD_CONTENTSIZE_ERROR, ZSTD_CONTENTSIZE_UNKNOWN)) | |
483 | return -EBADMSG; | |
484 | ||
485 | if (size < prefix_len + 1) | |
486 | return 0; /* Decompressed text too short to match the prefix and extra */ | |
487 | ||
488 | _cleanup_(ZSTD_freeDCtxp) ZSTD_DCtx *dctx = ZSTD_createDCtx(); | |
8653185a LP |
489 | if (!dctx) |
490 | return -ENOMEM; | |
491 | ||
319a4f4b | 492 | if (!(greedy_realloc(buffer, MAX(ZSTD_DStreamOutSize(), prefix_len + 1), 1))) |
8653185a LP |
493 | return -ENOMEM; |
494 | ||
495 | ZSTD_inBuffer input = { | |
496 | .src = src, | |
497 | .size = src_size, | |
498 | }; | |
499 | ZSTD_outBuffer output = { | |
500 | .dst = *buffer, | |
319a4f4b | 501 | .size = MALLOC_SIZEOF_SAFE(*buffer), |
8653185a | 502 | }; |
e4a321fc | 503 | size_t k; |
8653185a | 504 | |
e4a321fc ZJS |
505 | k = ZSTD_decompressStream(dctx, &output, &input); |
506 | if (ZSTD_isError(k)) { | |
507 | log_debug("ZSTD decoder failed: %s", ZSTD_getErrorName(k)); | |
508 | return zstd_ret_to_errno(k); | |
8653185a | 509 | } |
e4a321fc ZJS |
510 | assert(output.pos >= prefix_len + 1); |
511 | ||
512 | return memcmp(*buffer, prefix, prefix_len) == 0 && | |
513 | ((const uint8_t*) *buffer)[prefix_len] == extra; | |
8653185a LP |
514 | #else |
515 | return -EPROTONOSUPPORT; | |
516 | #endif | |
517 | } | |
518 | ||
519 | int decompress_startswith( | |
acc50c92 | 520 | Compression compression, |
319a4f4b LP |
521 | const void *src, |
522 | uint64_t src_size, | |
523 | void **buffer, | |
524 | const void *prefix, | |
525 | size_t prefix_len, | |
8653185a LP |
526 | uint8_t extra) { |
527 | ||
acc50c92 | 528 | if (compression == COMPRESSION_XZ) |
8653185a LP |
529 | return decompress_startswith_xz( |
530 | src, src_size, | |
319a4f4b | 531 | buffer, |
8653185a LP |
532 | prefix, prefix_len, |
533 | extra); | |
534 | ||
acc50c92 | 535 | else if (compression == COMPRESSION_LZ4) |
8653185a LP |
536 | return decompress_startswith_lz4( |
537 | src, src_size, | |
319a4f4b | 538 | buffer, |
8653185a LP |
539 | prefix, prefix_len, |
540 | extra); | |
acc50c92 | 541 | else if (compression == COMPRESSION_ZSTD) |
8653185a LP |
542 | return decompress_startswith_zstd( |
543 | src, src_size, | |
319a4f4b | 544 | buffer, |
8653185a LP |
545 | prefix, prefix_len, |
546 | extra); | |
d89c8fdf ZJS |
547 | else |
548 | return -EBADMSG; | |
549 | } | |
550 | ||
5b6f8e13 | 551 | int compress_stream_xz(int fdf, int fdt, uint64_t max_bytes, uint64_t *ret_uncompressed_size) { |
349cc4a5 | 552 | #if HAVE_XZ |
355b59e2 ZJS |
553 | _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
554 | lzma_ret ret; | |
355b59e2 ZJS |
555 | uint8_t buf[BUFSIZ], out[BUFSIZ]; |
556 | lzma_action action = LZMA_RUN; | |
557 | ||
558 | assert(fdf >= 0); | |
559 | assert(fdt >= 0); | |
560 | ||
d89c8fdf | 561 | ret = lzma_easy_encoder(&s, LZMA_PRESET_DEFAULT, LZMA_CHECK_CRC64); |
d7a0f1f4 FS |
562 | if (ret != LZMA_OK) |
563 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
564 | "Failed to initialize XZ encoder: code %u", | |
565 | ret); | |
355b59e2 ZJS |
566 | |
567 | for (;;) { | |
568 | if (s.avail_in == 0 && action == LZMA_RUN) { | |
569 | size_t m = sizeof(buf); | |
570 | ssize_t n; | |
571 | ||
f5fbe71d | 572 | if (max_bytes != UINT64_MAX && (uint64_t) m > max_bytes) |
59f448cf | 573 | m = (size_t) max_bytes; |
355b59e2 ZJS |
574 | |
575 | n = read(fdf, buf, m); | |
576 | if (n < 0) | |
577 | return -errno; | |
578 | if (n == 0) | |
579 | action = LZMA_FINISH; | |
580 | else { | |
581 | s.next_in = buf; | |
582 | s.avail_in = n; | |
583 | ||
f5fbe71d | 584 | if (max_bytes != UINT64_MAX) { |
59f448cf | 585 | assert(max_bytes >= (uint64_t) n); |
355b59e2 ZJS |
586 | max_bytes -= n; |
587 | } | |
588 | } | |
589 | } | |
590 | ||
591 | if (s.avail_out == 0) { | |
592 | s.next_out = out; | |
593 | s.avail_out = sizeof(out); | |
594 | } | |
595 | ||
596 | ret = lzma_code(&s, action); | |
d7a0f1f4 FS |
597 | if (!IN_SET(ret, LZMA_OK, LZMA_STREAM_END)) |
598 | return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), | |
599 | "Compression failed: code %u", | |
600 | ret); | |
355b59e2 ZJS |
601 | |
602 | if (s.avail_out == 0 || ret == LZMA_STREAM_END) { | |
603 | ssize_t n, k; | |
604 | ||
605 | n = sizeof(out) - s.avail_out; | |
606 | ||
355b59e2 ZJS |
607 | k = loop_write(fdt, out, n, false); |
608 | if (k < 0) | |
609 | return k; | |
355b59e2 ZJS |
610 | |
611 | if (ret == LZMA_STREAM_END) { | |
5b6f8e13 LB |
612 | if (ret_uncompressed_size) |
613 | *ret_uncompressed_size = s.total_in; | |
614 | ||
fa1c4b51 | 615 | log_debug("XZ compression finished (%"PRIu64" -> %"PRIu64" bytes, %.1f%%)", |
355b59e2 ZJS |
616 | s.total_in, s.total_out, |
617 | (double) s.total_out / s.total_in * 100); | |
618 | ||
acc50c92 | 619 | return COMPRESSION_XZ; |
355b59e2 ZJS |
620 | } |
621 | } | |
622 | } | |
3b1a55e1 ZJS |
623 | #else |
624 | return -EPROTONOSUPPORT; | |
625 | #endif | |
355b59e2 ZJS |
626 | } |
627 | ||
4b5bc539 | 628 | #define LZ4_BUFSIZE (512*1024u) |
d89c8fdf | 629 | |
5b6f8e13 | 630 | int compress_stream_lz4(int fdf, int fdt, uint64_t max_bytes, uint64_t *ret_uncompressed_size) { |
d89c8fdf | 631 | |
349cc4a5 | 632 | #if HAVE_LZ4 |
4b5bc539 ZJS |
633 | LZ4F_errorCode_t c; |
634 | _cleanup_(LZ4F_freeCompressionContextp) LZ4F_compressionContext_t ctx = NULL; | |
834bab01 LB |
635 | _cleanup_free_ void *in_buff = NULL; |
636 | _cleanup_free_ char *out_buff = NULL; | |
5b6f8e13 LB |
637 | size_t out_allocsize, n, offset = 0, frame_size; |
638 | uint64_t total_in = 0, total_out; | |
4b5bc539 | 639 | int r; |
4b5bc539 ZJS |
640 | static const LZ4F_preferences_t preferences = { |
641 | .frameInfo.blockSizeID = 5, | |
642 | }; | |
d89c8fdf | 643 | |
4b5bc539 ZJS |
644 | c = LZ4F_createCompressionContext(&ctx, LZ4F_VERSION); |
645 | if (LZ4F_isError(c)) | |
646 | return -ENOMEM; | |
d89c8fdf | 647 | |
4b5bc539 | 648 | frame_size = LZ4F_compressBound(LZ4_BUFSIZE, &preferences); |
834bab01 LB |
649 | out_allocsize = frame_size + 64*1024; /* add some space for header and trailer */ |
650 | out_buff = malloc(out_allocsize); | |
651 | if (!out_buff) | |
652 | return -ENOMEM; | |
653 | ||
654 | in_buff = malloc(LZ4_BUFSIZE); | |
655 | if (!in_buff) | |
4b5bc539 | 656 | return -ENOMEM; |
d89c8fdf | 657 | |
834bab01 | 658 | n = offset = total_out = LZ4F_compressBegin(ctx, out_buff, out_allocsize, &preferences); |
4b5bc539 ZJS |
659 | if (LZ4F_isError(n)) |
660 | return -EINVAL; | |
d89c8fdf | 661 | |
834bab01 | 662 | log_debug("Buffer size is %zu bytes, header size %zu bytes.", out_allocsize, n); |
d89c8fdf | 663 | |
834bab01 | 664 | for (;;) { |
4b5bc539 | 665 | ssize_t k; |
d89c8fdf | 666 | |
834bab01 LB |
667 | k = loop_read(fdf, in_buff, LZ4_BUFSIZE, true); |
668 | if (k < 0) | |
669 | return k; | |
670 | if (k == 0) | |
671 | break; | |
672 | n = LZ4F_compressUpdate(ctx, out_buff + offset, out_allocsize - offset, | |
673 | in_buff, k, NULL); | |
674 | if (LZ4F_isError(n)) | |
675 | return -ENOTRECOVERABLE; | |
d89c8fdf | 676 | |
4b5bc539 ZJS |
677 | total_in += k; |
678 | offset += n; | |
679 | total_out += n; | |
d89c8fdf | 680 | |
834bab01 LB |
681 | if (max_bytes != UINT64_MAX && total_out > (size_t) max_bytes) |
682 | return log_debug_errno(SYNTHETIC_ERRNO(EFBIG), | |
683 | "Compressed stream longer than %" PRIu64 " bytes", max_bytes); | |
d89c8fdf | 684 | |
834bab01 LB |
685 | if (out_allocsize - offset < frame_size + 4) { |
686 | k = loop_write(fdt, out_buff, offset, false); | |
687 | if (k < 0) | |
688 | return k; | |
4b5bc539 ZJS |
689 | offset = 0; |
690 | } | |
691 | } | |
d89c8fdf | 692 | |
834bab01 LB |
693 | n = LZ4F_compressEnd(ctx, out_buff + offset, out_allocsize - offset, NULL); |
694 | if (LZ4F_isError(n)) | |
695 | return -ENOTRECOVERABLE; | |
d89c8fdf | 696 | |
4b5bc539 ZJS |
697 | offset += n; |
698 | total_out += n; | |
834bab01 | 699 | r = loop_write(fdt, out_buff, offset, false); |
4b5bc539 | 700 | if (r < 0) |
834bab01 | 701 | return r; |
d89c8fdf | 702 | |
5b6f8e13 LB |
703 | if (ret_uncompressed_size) |
704 | *ret_uncompressed_size = total_in; | |
705 | ||
706 | log_debug("LZ4 compression finished (%" PRIu64 " -> %" PRIu64 " bytes, %.1f%%)", | |
d89c8fdf ZJS |
707 | total_in, total_out, |
708 | (double) total_out / total_in * 100); | |
834bab01 | 709 | |
acc50c92 | 710 | return COMPRESSION_LZ4; |
d89c8fdf ZJS |
711 | #else |
712 | return -EPROTONOSUPPORT; | |
713 | #endif | |
714 | } | |
715 | ||
59f448cf | 716 | int decompress_stream_xz(int fdf, int fdt, uint64_t max_bytes) { |
d89c8fdf | 717 | |
349cc4a5 | 718 | #if HAVE_XZ |
355b59e2 ZJS |
719 | _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
720 | lzma_ret ret; | |
721 | ||
722 | uint8_t buf[BUFSIZ], out[BUFSIZ]; | |
723 | lzma_action action = LZMA_RUN; | |
724 | ||
725 | assert(fdf >= 0); | |
726 | assert(fdt >= 0); | |
727 | ||
728 | ret = lzma_stream_decoder(&s, UINT64_MAX, 0); | |
d7a0f1f4 FS |
729 | if (ret != LZMA_OK) |
730 | return log_debug_errno(SYNTHETIC_ERRNO(ENOMEM), | |
731 | "Failed to initialize XZ decoder: code %u", | |
732 | ret); | |
355b59e2 ZJS |
733 | |
734 | for (;;) { | |
735 | if (s.avail_in == 0 && action == LZMA_RUN) { | |
736 | ssize_t n; | |
737 | ||
738 | n = read(fdf, buf, sizeof(buf)); | |
739 | if (n < 0) | |
740 | return -errno; | |
741 | if (n == 0) | |
742 | action = LZMA_FINISH; | |
743 | else { | |
744 | s.next_in = buf; | |
745 | s.avail_in = n; | |
746 | } | |
747 | } | |
748 | ||
749 | if (s.avail_out == 0) { | |
750 | s.next_out = out; | |
751 | s.avail_out = sizeof(out); | |
752 | } | |
753 | ||
754 | ret = lzma_code(&s, action); | |
d7a0f1f4 FS |
755 | if (!IN_SET(ret, LZMA_OK, LZMA_STREAM_END)) |
756 | return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), | |
757 | "Decompression failed: code %u", | |
758 | ret); | |
355b59e2 ZJS |
759 | |
760 | if (s.avail_out == 0 || ret == LZMA_STREAM_END) { | |
761 | ssize_t n, k; | |
762 | ||
763 | n = sizeof(out) - s.avail_out; | |
764 | ||
f5fbe71d | 765 | if (max_bytes != UINT64_MAX) { |
59f448cf | 766 | if (max_bytes < (uint64_t) n) |
d89c8fdf | 767 | return -EFBIG; |
355b59e2 ZJS |
768 | |
769 | max_bytes -= n; | |
770 | } | |
771 | ||
355b59e2 ZJS |
772 | k = loop_write(fdt, out, n, false); |
773 | if (k < 0) | |
774 | return k; | |
355b59e2 ZJS |
775 | |
776 | if (ret == LZMA_STREAM_END) { | |
fa1c4b51 | 777 | log_debug("XZ decompression finished (%"PRIu64" -> %"PRIu64" bytes, %.1f%%)", |
355b59e2 ZJS |
778 | s.total_in, s.total_out, |
779 | (double) s.total_out / s.total_in * 100); | |
780 | ||
781 | return 0; | |
782 | } | |
783 | } | |
784 | } | |
d89c8fdf | 785 | #else |
d7a0f1f4 FS |
786 | return log_debug_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), |
787 | "Cannot decompress file. Compiled without XZ support."); | |
d89c8fdf ZJS |
788 | #endif |
789 | } | |
790 | ||
8e64dd1e | 791 | int decompress_stream_lz4(int in, int out, uint64_t max_bytes) { |
349cc4a5 | 792 | #if HAVE_LZ4 |
4b5bc539 ZJS |
793 | size_t c; |
794 | _cleanup_(LZ4F_freeDecompressionContextp) LZ4F_decompressionContext_t ctx = NULL; | |
795 | _cleanup_free_ char *buf = NULL; | |
796 | char *src; | |
797 | struct stat st; | |
798 | int r = 0; | |
799 | size_t total_in = 0, total_out = 0; | |
800 | ||
801 | c = LZ4F_createDecompressionContext(&ctx, LZ4F_VERSION); | |
802 | if (LZ4F_isError(c)) | |
803 | return -ENOMEM; | |
804 | ||
805 | if (fstat(in, &st) < 0) | |
5146f9f0 | 806 | return log_debug_errno(errno, "fstat() failed: %m"); |
4b5bc539 | 807 | |
1a823cde TS |
808 | if (file_offset_beyond_memory_size(st.st_size)) |
809 | return -EFBIG; | |
810 | ||
4b5bc539 ZJS |
811 | buf = malloc(LZ4_BUFSIZE); |
812 | if (!buf) | |
813 | return -ENOMEM; | |
814 | ||
815 | src = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, in, 0); | |
e0685172 | 816 | if (src == MAP_FAILED) |
4b5bc539 ZJS |
817 | return -errno; |
818 | ||
819 | while (total_in < (size_t) st.st_size) { | |
820 | size_t produced = LZ4_BUFSIZE; | |
821 | size_t used = st.st_size - total_in; | |
822 | ||
823 | c = LZ4F_decompress(ctx, buf, &produced, src + total_in, &used, NULL); | |
824 | if (LZ4F_isError(c)) { | |
825 | r = -EBADMSG; | |
826 | goto cleanup; | |
827 | } | |
828 | ||
829 | total_in += used; | |
830 | total_out += produced; | |
831 | ||
f5fbe71d | 832 | if (max_bytes != UINT64_MAX && total_out > (size_t) max_bytes) { |
82e24b00 | 833 | log_debug("Decompressed stream longer than %"PRIu64" bytes", max_bytes); |
5146f9f0 | 834 | r = -EFBIG; |
4b5bc539 ZJS |
835 | goto cleanup; |
836 | } | |
837 | ||
838 | r = loop_write(out, buf, produced, false); | |
839 | if (r < 0) | |
840 | goto cleanup; | |
841 | } | |
842 | ||
843 | log_debug("LZ4 decompression finished (%zu -> %zu bytes, %.1f%%)", | |
844 | total_in, total_out, | |
25048348 | 845 | total_in > 0 ? (double) total_out / total_in * 100 : 0.0); |
4b5bc539 ZJS |
846 | cleanup: |
847 | munmap(src, st.st_size); | |
848 | return r; | |
d89c8fdf | 849 | #else |
d7a0f1f4 FS |
850 | return log_debug_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), |
851 | "Cannot decompress file. Compiled without LZ4 support."); | |
d89c8fdf ZJS |
852 | #endif |
853 | } | |
854 | ||
5b6f8e13 | 855 | int compress_stream_zstd(int fdf, int fdt, uint64_t max_bytes, uint64_t *ret_uncompressed_size) { |
ef5924aa NL |
856 | #if HAVE_ZSTD |
857 | _cleanup_(ZSTD_freeCCtxp) ZSTD_CCtx *cctx = NULL; | |
858 | _cleanup_free_ void *in_buff = NULL, *out_buff = NULL; | |
859 | size_t in_allocsize, out_allocsize; | |
860 | size_t z; | |
861 | uint64_t left = max_bytes, in_bytes = 0; | |
ef5924aa NL |
862 | |
863 | assert(fdf >= 0); | |
864 | assert(fdt >= 0); | |
865 | ||
866 | /* Create the context and buffers */ | |
867 | in_allocsize = ZSTD_CStreamInSize(); | |
868 | out_allocsize = ZSTD_CStreamOutSize(); | |
869 | in_buff = malloc(in_allocsize); | |
870 | out_buff = malloc(out_allocsize); | |
871 | cctx = ZSTD_createCCtx(); | |
872 | if (!cctx || !out_buff || !in_buff) | |
873 | return -ENOMEM; | |
874 | ||
ef5924aa NL |
875 | z = ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 1); |
876 | if (ZSTD_isError(z)) | |
877 | log_debug("Failed to enable ZSTD checksum, ignoring: %s", ZSTD_getErrorName(z)); | |
878 | ||
879 | /* This loop read from the input file, compresses that entire chunk, | |
880 | * and writes all output produced to the output file. | |
881 | */ | |
882 | for (;;) { | |
883 | bool is_last_chunk; | |
884 | ZSTD_inBuffer input = { | |
885 | .src = in_buff, | |
886 | .size = 0, | |
887 | .pos = 0 | |
888 | }; | |
889 | ssize_t red; | |
890 | ||
891 | red = loop_read(fdf, in_buff, in_allocsize, true); | |
892 | if (red < 0) | |
893 | return red; | |
894 | is_last_chunk = red == 0; | |
895 | ||
896 | in_bytes += (size_t) red; | |
897 | input.size = (size_t) red; | |
898 | ||
899 | for (bool finished = false; !finished;) { | |
900 | ZSTD_outBuffer output = { | |
901 | .dst = out_buff, | |
902 | .size = out_allocsize, | |
903 | .pos = 0 | |
904 | }; | |
905 | size_t remaining; | |
906 | ssize_t wrote; | |
907 | ||
908 | /* Compress into the output buffer and write all of the | |
909 | * output to the file so we can reuse the buffer next | |
910 | * iteration. | |
911 | */ | |
912 | remaining = ZSTD_compressStream2( | |
913 | cctx, &output, &input, | |
914 | is_last_chunk ? ZSTD_e_end : ZSTD_e_continue); | |
915 | ||
916 | if (ZSTD_isError(remaining)) { | |
917 | log_debug("ZSTD encoder failed: %s", ZSTD_getErrorName(remaining)); | |
918 | return zstd_ret_to_errno(remaining); | |
919 | } | |
920 | ||
921 | if (left < output.pos) | |
922 | return -EFBIG; | |
923 | ||
924 | wrote = loop_write(fdt, output.dst, output.pos, 1); | |
925 | if (wrote < 0) | |
926 | return wrote; | |
927 | ||
928 | left -= output.pos; | |
929 | ||
930 | /* If we're on the last chunk we're finished when zstd | |
931 | * returns 0, which means its consumed all the input AND | |
932 | * finished the frame. Otherwise, we're finished when | |
933 | * we've consumed all the input. | |
934 | */ | |
935 | finished = is_last_chunk ? (remaining == 0) : (input.pos == input.size); | |
936 | } | |
937 | ||
938 | /* zstd only returns 0 when the input is completely consumed */ | |
939 | assert(input.pos == input.size); | |
940 | if (is_last_chunk) | |
941 | break; | |
942 | } | |
943 | ||
5b6f8e13 LB |
944 | if (ret_uncompressed_size) |
945 | *ret_uncompressed_size = in_bytes; | |
946 | ||
89d36ce8 YW |
947 | if (in_bytes > 0) |
948 | log_debug("ZSTD compression finished (%" PRIu64 " -> %" PRIu64 " bytes, %.1f%%)", | |
949 | in_bytes, max_bytes - left, (double) (max_bytes - left) / in_bytes * 100); | |
950 | else | |
951 | log_debug("ZSTD compression finished (%" PRIu64 " -> %" PRIu64 " bytes)", | |
952 | in_bytes, max_bytes - left); | |
ef5924aa | 953 | |
acc50c92 | 954 | return COMPRESSION_ZSTD; |
ef5924aa NL |
955 | #else |
956 | return -EPROTONOSUPPORT; | |
957 | #endif | |
958 | } | |
959 | ||
960 | int decompress_stream_zstd(int fdf, int fdt, uint64_t max_bytes) { | |
961 | #if HAVE_ZSTD | |
962 | _cleanup_(ZSTD_freeDCtxp) ZSTD_DCtx *dctx = NULL; | |
963 | _cleanup_free_ void *in_buff = NULL, *out_buff = NULL; | |
964 | size_t in_allocsize, out_allocsize; | |
965 | size_t last_result = 0; | |
966 | uint64_t left = max_bytes, in_bytes = 0; | |
967 | ||
968 | assert(fdf >= 0); | |
969 | assert(fdt >= 0); | |
970 | ||
971 | /* Create the context and buffers */ | |
972 | in_allocsize = ZSTD_DStreamInSize(); | |
973 | out_allocsize = ZSTD_DStreamOutSize(); | |
974 | in_buff = malloc(in_allocsize); | |
975 | out_buff = malloc(out_allocsize); | |
976 | dctx = ZSTD_createDCtx(); | |
977 | if (!dctx || !out_buff || !in_buff) | |
978 | return -ENOMEM; | |
979 | ||
980 | /* This loop assumes that the input file is one or more concatenated | |
981 | * zstd streams. This example won't work if there is trailing non-zstd | |
982 | * data at the end, but streaming decompression in general handles this | |
983 | * case. ZSTD_decompressStream() returns 0 exactly when the frame is | |
984 | * completed, and doesn't consume input after the frame. | |
985 | */ | |
986 | for (;;) { | |
987 | bool has_error = false; | |
988 | ZSTD_inBuffer input = { | |
989 | .src = in_buff, | |
990 | .size = 0, | |
991 | .pos = 0 | |
992 | }; | |
993 | ssize_t red; | |
994 | ||
995 | red = loop_read(fdf, in_buff, in_allocsize, true); | |
996 | if (red < 0) | |
997 | return red; | |
998 | if (red == 0) | |
999 | break; | |
1000 | ||
1001 | in_bytes += (size_t) red; | |
1002 | input.size = (size_t) red; | |
1003 | input.pos = 0; | |
1004 | ||
1005 | /* Given a valid frame, zstd won't consume the last byte of the | |
1006 | * frame until it has flushed all of the decompressed data of | |
1007 | * the frame. So input.pos < input.size means frame is not done | |
1008 | * or there is still output available. | |
1009 | */ | |
1010 | while (input.pos < input.size) { | |
1011 | ZSTD_outBuffer output = { | |
1012 | .dst = out_buff, | |
1013 | .size = out_allocsize, | |
1014 | .pos = 0 | |
1015 | }; | |
1016 | ssize_t wrote; | |
1017 | /* The return code is zero if the frame is complete, but | |
1018 | * there may be multiple frames concatenated together. | |
1019 | * Zstd will automatically reset the context when a | |
1020 | * frame is complete. Still, calling ZSTD_DCtx_reset() | |
1021 | * can be useful to reset the context to a clean state, | |
1022 | * for instance if the last decompression call returned | |
1023 | * an error. | |
1024 | */ | |
1025 | last_result = ZSTD_decompressStream(dctx, &output, &input); | |
1026 | if (ZSTD_isError(last_result)) { | |
1027 | has_error = true; | |
1028 | break; | |
1029 | } | |
1030 | ||
1031 | if (left < output.pos) | |
1032 | return -EFBIG; | |
1033 | ||
1034 | wrote = loop_write(fdt, output.dst, output.pos, 1); | |
1035 | if (wrote < 0) | |
1036 | return wrote; | |
1037 | ||
1038 | left -= output.pos; | |
1039 | } | |
1040 | if (has_error) | |
1041 | break; | |
1042 | } | |
1043 | ||
1044 | if (in_bytes == 0) | |
1045 | return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), "ZSTD decoder failed: no data read"); | |
1046 | ||
1047 | if (last_result != 0) { | |
1048 | /* The last return value from ZSTD_decompressStream did not end | |
1049 | * on a frame, but we reached the end of the file! We assume | |
1050 | * this is an error, and the input was truncated. | |
1051 | */ | |
1052 | log_debug("ZSTD decoder failed: %s", ZSTD_getErrorName(last_result)); | |
1053 | return zstd_ret_to_errno(last_result); | |
1054 | } | |
1055 | ||
1056 | log_debug( | |
1057 | "ZSTD decompression finished (%" PRIu64 " -> %" PRIu64 " bytes, %.1f%%)", | |
1058 | in_bytes, | |
1059 | max_bytes - left, | |
1060 | (double) (max_bytes - left) / in_bytes * 100); | |
1061 | return 0; | |
1062 | #else | |
d7a0f1f4 FS |
1063 | return log_debug_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), |
1064 | "Cannot decompress file. Compiled without ZSTD support."); | |
ef5924aa NL |
1065 | #endif |
1066 | } | |
1067 | ||
59f448cf | 1068 | int decompress_stream(const char *filename, int fdf, int fdt, uint64_t max_bytes) { |
d89c8fdf ZJS |
1069 | |
1070 | if (endswith(filename, ".lz4")) | |
1071 | return decompress_stream_lz4(fdf, fdt, max_bytes); | |
1072 | else if (endswith(filename, ".xz")) | |
1073 | return decompress_stream_xz(fdf, fdt, max_bytes); | |
ef5924aa NL |
1074 | else if (endswith(filename, ".zst")) |
1075 | return decompress_stream_zstd(fdf, fdt, max_bytes); | |
d89c8fdf ZJS |
1076 | else |
1077 | return -EPROTONOSUPPORT; | |
355b59e2 | 1078 | } |