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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
e4e61fdb | 2 | |
82e24b00 | 3 | #include <inttypes.h> |
e4e61fdb | 4 | #include <stdlib.h> |
4b5bc539 | 5 | #include <sys/mman.h> |
ca78ad1d ZJS |
6 | #include <sys/types.h> |
7 | #include <sys/stat.h> | |
07630cea | 8 | #include <unistd.h> |
d89c8fdf | 9 | |
349cc4a5 | 10 | #if HAVE_XZ |
3ffd4af2 | 11 | #include <lzma.h> |
d89c8fdf ZJS |
12 | #endif |
13 | ||
349cc4a5 | 14 | #if HAVE_LZ4 |
3ffd4af2 LP |
15 | #include <lz4.h> |
16 | #include <lz4frame.h> | |
d89c8fdf | 17 | #endif |
e4e61fdb | 18 | |
ef5924aa NL |
19 | #if HAVE_ZSTD |
20 | #include <zstd.h> | |
21 | #include <zstd_errors.h> | |
22 | #endif | |
23 | ||
b5efdb8a | 24 | #include "alloc-util.h" |
e4e61fdb | 25 | #include "compress.h" |
3ffd4af2 | 26 | #include "fd-util.h" |
c004493c | 27 | #include "io-util.h" |
07630cea | 28 | #include "journal-def.h" |
355b59e2 | 29 | #include "macro.h" |
d89c8fdf | 30 | #include "sparse-endian.h" |
8b43440b | 31 | #include "string-table.h" |
07630cea | 32 | #include "string-util.h" |
4094c4bf | 33 | #include "unaligned.h" |
07630cea | 34 | #include "util.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 | ||
59 | static const char* const object_compressed_table[_OBJECT_COMPRESSED_MAX] = { | |
e9ece6a0 LP |
60 | [OBJECT_COMPRESSED_XZ] = "XZ", |
61 | [OBJECT_COMPRESSED_LZ4] = "LZ4", | |
8653185a | 62 | [OBJECT_COMPRESSED_ZSTD] = "ZSTD", |
e9ece6a0 LP |
63 | /* If we add too many more entries here, it's going to grow quite large (and be mostly sparse), since |
64 | * the array key is actually a bitmask, not a plain enum */ | |
d89c8fdf | 65 | }; |
e4e61fdb | 66 | |
d89c8fdf ZJS |
67 | DEFINE_STRING_TABLE_LOOKUP(object_compressed, int); |
68 | ||
5d6f46b6 ZJS |
69 | int compress_blob_xz(const void *src, uint64_t src_size, |
70 | void *dst, size_t dst_alloc_size, size_t *dst_size) { | |
349cc4a5 | 71 | #if HAVE_XZ |
1930eed2 JS |
72 | static const lzma_options_lzma opt = { |
73 | 1u << 20u, NULL, 0, LZMA_LC_DEFAULT, LZMA_LP_DEFAULT, | |
0240c603 LP |
74 | LZMA_PB_DEFAULT, LZMA_MODE_FAST, 128, LZMA_MF_HC3, 4 |
75 | }; | |
76 | static const lzma_filter filters[] = { | |
77 | { LZMA_FILTER_LZMA2, (lzma_options_lzma*) &opt }, | |
78 | { LZMA_VLI_UNKNOWN, NULL } | |
1930eed2 | 79 | }; |
e4e61fdb | 80 | lzma_ret ret; |
76cc0bf6 | 81 | size_t out_pos = 0; |
e4e61fdb LP |
82 | |
83 | assert(src); | |
84 | assert(src_size > 0); | |
85 | assert(dst); | |
5d6f46b6 | 86 | assert(dst_alloc_size > 0); |
e4e61fdb LP |
87 | assert(dst_size); |
88 | ||
d89c8fdf | 89 | /* Returns < 0 if we couldn't compress the data or the |
e4e61fdb LP |
90 | * compressed result is longer than the original */ |
91 | ||
1930eed2 JS |
92 | if (src_size < 80) |
93 | return -ENOBUFS; | |
94 | ||
95 | ret = lzma_stream_buffer_encode((lzma_filter*) filters, LZMA_CHECK_NONE, NULL, | |
5d6f46b6 | 96 | src, src_size, dst, &out_pos, dst_alloc_size); |
e4e61fdb | 97 | if (ret != LZMA_OK) |
d89c8fdf | 98 | return -ENOBUFS; |
e4e61fdb | 99 | |
76cc0bf6 | 100 | *dst_size = out_pos; |
d89c8fdf ZJS |
101 | return 0; |
102 | #else | |
103 | return -EPROTONOSUPPORT; | |
104 | #endif | |
e4e61fdb LP |
105 | } |
106 | ||
5d6f46b6 ZJS |
107 | int compress_blob_lz4(const void *src, uint64_t src_size, |
108 | void *dst, size_t dst_alloc_size, size_t *dst_size) { | |
349cc4a5 | 109 | #if HAVE_LZ4 |
d89c8fdf ZJS |
110 | int r; |
111 | ||
112 | assert(src); | |
113 | assert(src_size > 0); | |
114 | assert(dst); | |
5d6f46b6 | 115 | assert(dst_alloc_size > 0); |
d89c8fdf ZJS |
116 | assert(dst_size); |
117 | ||
118 | /* Returns < 0 if we couldn't compress the data or the | |
119 | * compressed result is longer than the original */ | |
120 | ||
121 | if (src_size < 9) | |
122 | return -ENOBUFS; | |
e4e61fdb | 123 | |
691b90d4 | 124 | r = LZ4_compress_default(src, (char*)dst + 8, src_size, (int) dst_alloc_size - 8); |
d89c8fdf ZJS |
125 | if (r <= 0) |
126 | return -ENOBUFS; | |
127 | ||
4094c4bf | 128 | unaligned_write_le64(dst, src_size); |
d89c8fdf ZJS |
129 | *dst_size = r + 8; |
130 | ||
131 | return 0; | |
132 | #else | |
133 | return -EPROTONOSUPPORT; | |
134 | #endif | |
135 | } | |
136 | ||
8653185a LP |
137 | int compress_blob_zstd( |
138 | const void *src, uint64_t src_size, | |
139 | void *dst, size_t dst_alloc_size, size_t *dst_size) { | |
140 | #if HAVE_ZSTD | |
141 | size_t k; | |
142 | ||
143 | assert(src); | |
144 | assert(src_size > 0); | |
145 | assert(dst); | |
146 | assert(dst_alloc_size > 0); | |
147 | assert(dst_size); | |
148 | ||
149 | k = ZSTD_compress(dst, dst_alloc_size, src, src_size, 0); | |
150 | if (ZSTD_isError(k)) | |
151 | return zstd_ret_to_errno(k); | |
152 | ||
153 | *dst_size = k; | |
154 | return 0; | |
155 | #else | |
156 | return -EPROTONOSUPPORT; | |
157 | #endif | |
158 | } | |
159 | ||
d89c8fdf | 160 | int decompress_blob_xz(const void *src, uint64_t src_size, |
fa1c4b51 | 161 | void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max) { |
d89c8fdf | 162 | |
349cc4a5 | 163 | #if HAVE_XZ |
5e592c66 | 164 | _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
e4e61fdb | 165 | lzma_ret ret; |
fa1c4b51 | 166 | size_t space; |
e4e61fdb LP |
167 | |
168 | assert(src); | |
169 | assert(src_size > 0); | |
170 | assert(dst); | |
171 | assert(dst_alloc_size); | |
172 | assert(dst_size); | |
173 | assert(*dst_alloc_size == 0 || *dst); | |
174 | ||
175 | ret = lzma_stream_decoder(&s, UINT64_MAX, 0); | |
176 | if (ret != LZMA_OK) | |
d89c8fdf | 177 | return -ENOMEM; |
e4e61fdb | 178 | |
fa1c4b51 | 179 | space = MIN(src_size * 2, dst_max ?: (size_t) -1); |
5e592c66 | 180 | if (!greedy_realloc(dst, dst_alloc_size, space, 1)) |
01c3322e | 181 | return -ENOMEM; |
e4e61fdb LP |
182 | |
183 | s.next_in = src; | |
184 | s.avail_in = src_size; | |
185 | ||
186 | s.next_out = *dst; | |
93b73b06 | 187 | s.avail_out = space; |
e4e61fdb LP |
188 | |
189 | for (;;) { | |
fa1c4b51 | 190 | size_t used; |
e4e61fdb LP |
191 | |
192 | ret = lzma_code(&s, LZMA_FINISH); | |
193 | ||
194 | if (ret == LZMA_STREAM_END) | |
195 | break; | |
d89c8fdf ZJS |
196 | else if (ret != LZMA_OK) |
197 | return -ENOMEM; | |
e4e61fdb | 198 | |
93b73b06 LP |
199 | if (dst_max > 0 && (space - s.avail_out) >= dst_max) |
200 | break; | |
d89c8fdf ZJS |
201 | else if (dst_max > 0 && space == dst_max) |
202 | return -ENOBUFS; | |
93b73b06 | 203 | |
5e592c66 | 204 | used = space - s.avail_out; |
fa1c4b51 | 205 | space = MIN(2 * space, dst_max ?: (size_t) -1); |
5e592c66 | 206 | if (!greedy_realloc(dst, dst_alloc_size, space, 1)) |
01c3322e | 207 | return -ENOMEM; |
e4e61fdb | 208 | |
5e592c66 | 209 | s.avail_out = space - used; |
8e170d29 | 210 | s.next_out = *(uint8_t**)dst + used; |
e4e61fdb LP |
211 | } |
212 | ||
93b73b06 | 213 | *dst_size = space - s.avail_out; |
d89c8fdf ZJS |
214 | return 0; |
215 | #else | |
216 | return -EPROTONOSUPPORT; | |
217 | #endif | |
e4e61fdb LP |
218 | } |
219 | ||
d89c8fdf | 220 | int decompress_blob_lz4(const void *src, uint64_t src_size, |
fa1c4b51 | 221 | void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max) { |
d89c8fdf | 222 | |
349cc4a5 | 223 | #if HAVE_LZ4 |
d89c8fdf | 224 | char* out; |
fa1c4b51 | 225 | int r, size; /* LZ4 uses int for size */ |
e4e61fdb | 226 | |
d89c8fdf ZJS |
227 | assert(src); |
228 | assert(src_size > 0); | |
229 | assert(dst); | |
230 | assert(dst_alloc_size); | |
231 | assert(dst_size); | |
232 | assert(*dst_alloc_size == 0 || *dst); | |
233 | ||
234 | if (src_size <= 8) | |
235 | return -EBADMSG; | |
236 | ||
4094c4bf LP |
237 | size = unaligned_read_le64(src); |
238 | if (size < 0 || (unsigned) size != unaligned_read_le64(src)) | |
fa1c4b51 ZJS |
239 | return -EFBIG; |
240 | if ((size_t) size > *dst_alloc_size) { | |
d89c8fdf ZJS |
241 | out = realloc(*dst, size); |
242 | if (!out) | |
243 | return -ENOMEM; | |
244 | *dst = out; | |
245 | *dst_alloc_size = size; | |
246 | } else | |
247 | out = *dst; | |
248 | ||
8e170d29 | 249 | r = LZ4_decompress_safe((char*)src + 8, out, src_size - 8, size); |
fa1c4b51 | 250 | if (r < 0 || r != size) |
d89c8fdf ZJS |
251 | return -EBADMSG; |
252 | ||
253 | *dst_size = size; | |
254 | return 0; | |
255 | #else | |
256 | return -EPROTONOSUPPORT; | |
257 | #endif | |
258 | } | |
259 | ||
8653185a LP |
260 | int decompress_blob_zstd( |
261 | const void *src, uint64_t src_size, | |
a2415327 | 262 | void **dst, size_t *dst_alloc_size, size_t *dst_size, size_t dst_max) { |
8653185a LP |
263 | |
264 | #if HAVE_ZSTD | |
a2415327 | 265 | uint64_t size; |
8653185a LP |
266 | |
267 | assert(src); | |
268 | assert(src_size > 0); | |
269 | assert(dst); | |
270 | assert(dst_alloc_size); | |
271 | assert(dst_size); | |
272 | assert(*dst_alloc_size == 0 || *dst); | |
273 | ||
a2415327 ZJS |
274 | size = ZSTD_getFrameContentSize(src, src_size); |
275 | if (IN_SET(size, ZSTD_CONTENTSIZE_ERROR, ZSTD_CONTENTSIZE_UNKNOWN)) | |
276 | return -EBADMSG; | |
8653185a | 277 | |
a2415327 ZJS |
278 | if (dst_max > 0 && size > dst_max) |
279 | size = dst_max; | |
280 | if (size > SIZE_MAX) | |
281 | return -E2BIG; | |
8653185a | 282 | |
a2415327 ZJS |
283 | if (!(greedy_realloc(dst, dst_alloc_size, MAX(ZSTD_DStreamOutSize(), size), 1))) |
284 | return -ENOMEM; | |
8653185a | 285 | |
a2415327 ZJS |
286 | _cleanup_(ZSTD_freeDCtxp) ZSTD_DCtx *dctx = ZSTD_createDCtx(); |
287 | if (!dctx) | |
288 | return -ENOMEM; | |
8653185a | 289 | |
a2415327 ZJS |
290 | ZSTD_inBuffer input = { |
291 | .src = src, | |
292 | .size = src_size, | |
293 | }; | |
294 | ZSTD_outBuffer output = { | |
295 | .dst = *dst, | |
296 | .size = *dst_alloc_size, | |
297 | }; | |
8653185a | 298 | |
a2415327 ZJS |
299 | size_t k = ZSTD_decompressStream(dctx, &output, &input); |
300 | if (ZSTD_isError(k)) { | |
301 | log_debug("ZSTD decoder failed: %s", ZSTD_getErrorName(k)); | |
302 | return zstd_ret_to_errno(k); | |
8653185a | 303 | } |
a2415327 ZJS |
304 | assert(output.pos >= size); |
305 | ||
306 | *dst_size = size; | |
307 | return 0; | |
8653185a LP |
308 | #else |
309 | return -EPROTONOSUPPORT; | |
310 | #endif | |
311 | } | |
312 | ||
313 | int decompress_blob( | |
314 | int compression, | |
315 | const void *src, uint64_t src_size, | |
316 | void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max) { | |
317 | ||
d89c8fdf | 318 | if (compression == OBJECT_COMPRESSED_XZ) |
8653185a LP |
319 | return decompress_blob_xz( |
320 | src, src_size, | |
321 | dst, dst_alloc_size, dst_size, dst_max); | |
d89c8fdf | 322 | else if (compression == OBJECT_COMPRESSED_LZ4) |
8653185a LP |
323 | return decompress_blob_lz4( |
324 | src, src_size, | |
325 | dst, dst_alloc_size, dst_size, dst_max); | |
326 | else if (compression == OBJECT_COMPRESSED_ZSTD) | |
327 | return decompress_blob_zstd( | |
328 | src, src_size, | |
329 | dst, dst_alloc_size, dst_size, dst_max); | |
d89c8fdf | 330 | else |
b4a11ca3 | 331 | return -EPROTONOSUPPORT; |
d89c8fdf ZJS |
332 | } |
333 | ||
d89c8fdf | 334 | int decompress_startswith_xz(const void *src, uint64_t src_size, |
fa1c4b51 ZJS |
335 | void **buffer, size_t *buffer_size, |
336 | const void *prefix, size_t prefix_len, | |
d89c8fdf ZJS |
337 | uint8_t extra) { |
338 | ||
349cc4a5 | 339 | #if HAVE_XZ |
5e592c66 | 340 | _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
e4e61fdb | 341 | lzma_ret ret; |
e4e61fdb | 342 | |
d89c8fdf | 343 | /* Checks whether the decompressed blob starts with the |
e4e61fdb LP |
344 | * mentioned prefix. The byte extra needs to follow the |
345 | * prefix */ | |
346 | ||
347 | assert(src); | |
348 | assert(src_size > 0); | |
349 | assert(buffer); | |
350 | assert(buffer_size); | |
351 | assert(prefix); | |
352 | assert(*buffer_size == 0 || *buffer); | |
353 | ||
354 | ret = lzma_stream_decoder(&s, UINT64_MAX, 0); | |
355 | if (ret != LZMA_OK) | |
d89c8fdf | 356 | return -EBADMSG; |
e4e61fdb | 357 | |
d89c8fdf ZJS |
358 | if (!(greedy_realloc(buffer, buffer_size, ALIGN_8(prefix_len + 1), 1))) |
359 | return -ENOMEM; | |
e4e61fdb LP |
360 | |
361 | s.next_in = src; | |
362 | s.avail_in = src_size; | |
363 | ||
364 | s.next_out = *buffer; | |
365 | s.avail_out = *buffer_size; | |
366 | ||
367 | for (;;) { | |
e4e61fdb LP |
368 | ret = lzma_code(&s, LZMA_FINISH); |
369 | ||
4c701096 | 370 | if (!IN_SET(ret, LZMA_OK, LZMA_STREAM_END)) |
d89c8fdf | 371 | return -EBADMSG; |
e4e61fdb | 372 | |
5e592c66 ZJS |
373 | if (*buffer_size - s.avail_out >= prefix_len + 1) |
374 | return memcmp(*buffer, prefix, prefix_len) == 0 && | |
375 | ((const uint8_t*) *buffer)[prefix_len] == extra; | |
e4e61fdb LP |
376 | |
377 | if (ret == LZMA_STREAM_END) | |
d89c8fdf | 378 | return 0; |
e4e61fdb | 379 | |
e4e61fdb LP |
380 | s.avail_out += *buffer_size; |
381 | ||
5e592c66 | 382 | if (!(greedy_realloc(buffer, buffer_size, *buffer_size * 2, 1))) |
d89c8fdf | 383 | return -ENOMEM; |
e4e61fdb | 384 | |
8e170d29 | 385 | s.next_out = *(uint8_t**)buffer + *buffer_size - s.avail_out; |
5e592c66 | 386 | } |
d89c8fdf ZJS |
387 | |
388 | #else | |
389 | return -EPROTONOSUPPORT; | |
390 | #endif | |
391 | } | |
392 | ||
393 | int decompress_startswith_lz4(const void *src, uint64_t src_size, | |
fa1c4b51 ZJS |
394 | void **buffer, size_t *buffer_size, |
395 | const void *prefix, size_t prefix_len, | |
d89c8fdf | 396 | uint8_t extra) { |
349cc4a5 | 397 | #if HAVE_LZ4 |
d89c8fdf ZJS |
398 | /* Checks whether the decompressed blob starts with the |
399 | * mentioned prefix. The byte extra needs to follow the | |
400 | * prefix */ | |
401 | ||
402 | int r; | |
403 | ||
404 | assert(src); | |
405 | assert(src_size > 0); | |
406 | assert(buffer); | |
407 | assert(buffer_size); | |
408 | assert(prefix); | |
409 | assert(*buffer_size == 0 || *buffer); | |
410 | ||
411 | if (src_size <= 8) | |
412 | return -EBADMSG; | |
413 | ||
414 | if (!(greedy_realloc(buffer, buffer_size, ALIGN_8(prefix_len + 1), 1))) | |
415 | return -ENOMEM; | |
416 | ||
8e170d29 | 417 | r = LZ4_decompress_safe_partial((char*)src + 8, *buffer, src_size - 8, |
d89c8fdf | 418 | prefix_len + 1, *buffer_size); |
e41ef6fd ZJS |
419 | /* One lz4 < 1.8.3, we might get "failure" (r < 0), or "success" where |
420 | * just a part of the buffer is decompressed. But if we get a smaller | |
421 | * amount of bytes than requested, we don't know whether there isn't enough | |
422 | * data to fill the requested size or whether we just got a partial answer. | |
423 | */ | |
424 | if (r < 0 || (size_t) r < prefix_len + 1) { | |
425 | size_t size; | |
426 | ||
427 | if (LZ4_versionNumber() >= 10803) | |
428 | /* We trust that the newer lz4 decompresses the number of bytes we | |
429 | * requested if available in the compressed string. */ | |
430 | return 0; | |
431 | ||
432 | if (r > 0) | |
433 | /* Compare what we have first, in case of mismatch we can | |
434 | * shortcut the full comparison. */ | |
435 | if (memcmp(*buffer, prefix, r) != 0) | |
436 | return 0; | |
437 | ||
438 | /* Before version 1.8.3, lz4 always tries to decode full a "sequence", | |
439 | * so in pathological cases might need to decompress the full field. */ | |
1f4b467d ZJS |
440 | r = decompress_blob_lz4(src, src_size, buffer, buffer_size, &size, 0); |
441 | if (r < 0) | |
442 | return r; | |
d89c8fdf | 443 | |
e41ef6fd ZJS |
444 | if (size < prefix_len + 1) |
445 | return 0; | |
446 | } | |
d89c8fdf | 447 | |
e41ef6fd ZJS |
448 | return memcmp(*buffer, prefix, prefix_len) == 0 && |
449 | ((const uint8_t*) *buffer)[prefix_len] == extra; | |
d89c8fdf ZJS |
450 | #else |
451 | return -EPROTONOSUPPORT; | |
452 | #endif | |
e4e61fdb | 453 | } |
355b59e2 | 454 | |
8653185a LP |
455 | int decompress_startswith_zstd( |
456 | const void *src, uint64_t src_size, | |
457 | void **buffer, size_t *buffer_size, | |
458 | const void *prefix, size_t prefix_len, | |
459 | uint8_t extra) { | |
460 | #if HAVE_ZSTD | |
8653185a LP |
461 | assert(src); |
462 | assert(src_size > 0); | |
463 | assert(buffer); | |
464 | assert(buffer_size); | |
465 | assert(prefix); | |
466 | assert(*buffer_size == 0 || *buffer); | |
467 | ||
e4a321fc ZJS |
468 | uint64_t size = ZSTD_getFrameContentSize(src, src_size); |
469 | if (IN_SET(size, ZSTD_CONTENTSIZE_ERROR, ZSTD_CONTENTSIZE_UNKNOWN)) | |
470 | return -EBADMSG; | |
471 | ||
472 | if (size < prefix_len + 1) | |
473 | return 0; /* Decompressed text too short to match the prefix and extra */ | |
474 | ||
475 | _cleanup_(ZSTD_freeDCtxp) ZSTD_DCtx *dctx = ZSTD_createDCtx(); | |
8653185a LP |
476 | if (!dctx) |
477 | return -ENOMEM; | |
478 | ||
479 | if (!(greedy_realloc(buffer, buffer_size, MAX(ZSTD_DStreamOutSize(), prefix_len + 1), 1))) | |
480 | return -ENOMEM; | |
481 | ||
482 | ZSTD_inBuffer input = { | |
483 | .src = src, | |
484 | .size = src_size, | |
485 | }; | |
486 | ZSTD_outBuffer output = { | |
487 | .dst = *buffer, | |
488 | .size = *buffer_size, | |
489 | }; | |
e4a321fc | 490 | size_t k; |
8653185a | 491 | |
e4a321fc ZJS |
492 | k = ZSTD_decompressStream(dctx, &output, &input); |
493 | if (ZSTD_isError(k)) { | |
494 | log_debug("ZSTD decoder failed: %s", ZSTD_getErrorName(k)); | |
495 | return zstd_ret_to_errno(k); | |
8653185a | 496 | } |
e4a321fc ZJS |
497 | assert(output.pos >= prefix_len + 1); |
498 | ||
499 | return memcmp(*buffer, prefix, prefix_len) == 0 && | |
500 | ((const uint8_t*) *buffer)[prefix_len] == extra; | |
8653185a LP |
501 | #else |
502 | return -EPROTONOSUPPORT; | |
503 | #endif | |
504 | } | |
505 | ||
506 | int decompress_startswith( | |
507 | int compression, | |
508 | const void *src, uint64_t src_size, | |
509 | void **buffer, size_t *buffer_size, | |
510 | const void *prefix, size_t prefix_len, | |
511 | uint8_t extra) { | |
512 | ||
d89c8fdf | 513 | if (compression == OBJECT_COMPRESSED_XZ) |
8653185a LP |
514 | return decompress_startswith_xz( |
515 | src, src_size, | |
516 | buffer, buffer_size, | |
517 | prefix, prefix_len, | |
518 | extra); | |
519 | ||
d89c8fdf | 520 | else if (compression == OBJECT_COMPRESSED_LZ4) |
8653185a LP |
521 | return decompress_startswith_lz4( |
522 | src, src_size, | |
523 | buffer, buffer_size, | |
524 | prefix, prefix_len, | |
525 | extra); | |
526 | else if (compression == OBJECT_COMPRESSED_ZSTD) | |
527 | return decompress_startswith_zstd( | |
528 | src, src_size, | |
529 | buffer, buffer_size, | |
530 | prefix, prefix_len, | |
531 | extra); | |
d89c8fdf ZJS |
532 | else |
533 | return -EBADMSG; | |
534 | } | |
535 | ||
59f448cf | 536 | int compress_stream_xz(int fdf, int fdt, uint64_t max_bytes) { |
349cc4a5 | 537 | #if HAVE_XZ |
355b59e2 ZJS |
538 | _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
539 | lzma_ret ret; | |
355b59e2 ZJS |
540 | uint8_t buf[BUFSIZ], out[BUFSIZ]; |
541 | lzma_action action = LZMA_RUN; | |
542 | ||
543 | assert(fdf >= 0); | |
544 | assert(fdt >= 0); | |
545 | ||
d89c8fdf | 546 | ret = lzma_easy_encoder(&s, LZMA_PRESET_DEFAULT, LZMA_CHECK_CRC64); |
d7a0f1f4 FS |
547 | if (ret != LZMA_OK) |
548 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
549 | "Failed to initialize XZ encoder: code %u", | |
550 | ret); | |
355b59e2 ZJS |
551 | |
552 | for (;;) { | |
553 | if (s.avail_in == 0 && action == LZMA_RUN) { | |
554 | size_t m = sizeof(buf); | |
555 | ssize_t n; | |
556 | ||
59f448cf LP |
557 | if (max_bytes != (uint64_t) -1 && (uint64_t) m > max_bytes) |
558 | m = (size_t) max_bytes; | |
355b59e2 ZJS |
559 | |
560 | n = read(fdf, buf, m); | |
561 | if (n < 0) | |
562 | return -errno; | |
563 | if (n == 0) | |
564 | action = LZMA_FINISH; | |
565 | else { | |
566 | s.next_in = buf; | |
567 | s.avail_in = n; | |
568 | ||
59f448cf LP |
569 | if (max_bytes != (uint64_t) -1) { |
570 | assert(max_bytes >= (uint64_t) n); | |
355b59e2 ZJS |
571 | max_bytes -= n; |
572 | } | |
573 | } | |
574 | } | |
575 | ||
576 | if (s.avail_out == 0) { | |
577 | s.next_out = out; | |
578 | s.avail_out = sizeof(out); | |
579 | } | |
580 | ||
581 | ret = lzma_code(&s, action); | |
d7a0f1f4 FS |
582 | if (!IN_SET(ret, LZMA_OK, LZMA_STREAM_END)) |
583 | return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), | |
584 | "Compression failed: code %u", | |
585 | ret); | |
355b59e2 ZJS |
586 | |
587 | if (s.avail_out == 0 || ret == LZMA_STREAM_END) { | |
588 | ssize_t n, k; | |
589 | ||
590 | n = sizeof(out) - s.avail_out; | |
591 | ||
355b59e2 ZJS |
592 | k = loop_write(fdt, out, n, false); |
593 | if (k < 0) | |
594 | return k; | |
355b59e2 ZJS |
595 | |
596 | if (ret == LZMA_STREAM_END) { | |
fa1c4b51 | 597 | log_debug("XZ compression finished (%"PRIu64" -> %"PRIu64" bytes, %.1f%%)", |
355b59e2 ZJS |
598 | s.total_in, s.total_out, |
599 | (double) s.total_out / s.total_in * 100); | |
600 | ||
601 | return 0; | |
602 | } | |
603 | } | |
604 | } | |
3b1a55e1 ZJS |
605 | #else |
606 | return -EPROTONOSUPPORT; | |
607 | #endif | |
355b59e2 ZJS |
608 | } |
609 | ||
4b5bc539 | 610 | #define LZ4_BUFSIZE (512*1024u) |
d89c8fdf | 611 | |
59f448cf | 612 | int compress_stream_lz4(int fdf, int fdt, uint64_t max_bytes) { |
d89c8fdf | 613 | |
349cc4a5 | 614 | #if HAVE_LZ4 |
4b5bc539 ZJS |
615 | LZ4F_errorCode_t c; |
616 | _cleanup_(LZ4F_freeCompressionContextp) LZ4F_compressionContext_t ctx = NULL; | |
617 | _cleanup_free_ char *buf = NULL; | |
618 | char *src = NULL; | |
d487b815 | 619 | size_t size, n, total_in = 0, total_out, offset = 0, frame_size; |
4b5bc539 ZJS |
620 | struct stat st; |
621 | int r; | |
622 | static const LZ4F_compressOptions_t options = { | |
623 | .stableSrc = 1, | |
624 | }; | |
625 | static const LZ4F_preferences_t preferences = { | |
626 | .frameInfo.blockSizeID = 5, | |
627 | }; | |
d89c8fdf | 628 | |
4b5bc539 ZJS |
629 | c = LZ4F_createCompressionContext(&ctx, LZ4F_VERSION); |
630 | if (LZ4F_isError(c)) | |
631 | return -ENOMEM; | |
d89c8fdf | 632 | |
4b5bc539 | 633 | if (fstat(fdf, &st) < 0) |
5146f9f0 | 634 | return log_debug_errno(errno, "fstat() failed: %m"); |
d89c8fdf | 635 | |
4b5bc539 ZJS |
636 | frame_size = LZ4F_compressBound(LZ4_BUFSIZE, &preferences); |
637 | size = frame_size + 64*1024; /* add some space for header and trailer */ | |
638 | buf = malloc(size); | |
639 | if (!buf) | |
640 | return -ENOMEM; | |
d89c8fdf | 641 | |
d487b815 | 642 | n = offset = total_out = LZ4F_compressBegin(ctx, buf, size, &preferences); |
4b5bc539 ZJS |
643 | if (LZ4F_isError(n)) |
644 | return -EINVAL; | |
d89c8fdf | 645 | |
4b5bc539 | 646 | src = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fdf, 0); |
e0685172 | 647 | if (src == MAP_FAILED) |
4b5bc539 | 648 | return -errno; |
d89c8fdf | 649 | |
4b5bc539 | 650 | log_debug("Buffer size is %zu bytes, header size %zu bytes.", size, n); |
d89c8fdf | 651 | |
4b5bc539 ZJS |
652 | while (total_in < (size_t) st.st_size) { |
653 | ssize_t k; | |
d89c8fdf | 654 | |
4b5bc539 ZJS |
655 | k = MIN(LZ4_BUFSIZE, st.st_size - total_in); |
656 | n = LZ4F_compressUpdate(ctx, buf + offset, size - offset, | |
657 | src + total_in, k, &options); | |
658 | if (LZ4F_isError(n)) { | |
659 | r = -ENOTRECOVERABLE; | |
660 | goto cleanup; | |
d89c8fdf ZJS |
661 | } |
662 | ||
4b5bc539 ZJS |
663 | total_in += k; |
664 | offset += n; | |
665 | total_out += n; | |
d89c8fdf | 666 | |
363729c4 ZJS |
667 | if (max_bytes != (uint64_t) -1 && total_out > (size_t) max_bytes) { |
668 | r = log_debug_errno(SYNTHETIC_ERRNO(EFBIG), | |
669 | "Compressed stream longer than %" PRIu64 " bytes", max_bytes); | |
670 | goto cleanup; | |
671 | } | |
d89c8fdf | 672 | |
4b5bc539 | 673 | if (size - offset < frame_size + 4) { |
4b5bc539 ZJS |
674 | k = loop_write(fdt, buf, offset, false); |
675 | if (k < 0) { | |
676 | r = k; | |
677 | goto cleanup; | |
678 | } | |
679 | offset = 0; | |
680 | } | |
681 | } | |
d89c8fdf | 682 | |
4b5bc539 ZJS |
683 | n = LZ4F_compressEnd(ctx, buf + offset, size - offset, &options); |
684 | if (LZ4F_isError(n)) { | |
685 | r = -ENOTRECOVERABLE; | |
686 | goto cleanup; | |
d89c8fdf ZJS |
687 | } |
688 | ||
4b5bc539 ZJS |
689 | offset += n; |
690 | total_out += n; | |
4b5bc539 ZJS |
691 | r = loop_write(fdt, buf, offset, false); |
692 | if (r < 0) | |
693 | goto cleanup; | |
d89c8fdf ZJS |
694 | |
695 | log_debug("LZ4 compression finished (%zu -> %zu bytes, %.1f%%)", | |
696 | total_in, total_out, | |
697 | (double) total_out / total_in * 100); | |
4b5bc539 ZJS |
698 | cleanup: |
699 | munmap(src, st.st_size); | |
700 | return r; | |
d89c8fdf ZJS |
701 | #else |
702 | return -EPROTONOSUPPORT; | |
703 | #endif | |
704 | } | |
705 | ||
59f448cf | 706 | int decompress_stream_xz(int fdf, int fdt, uint64_t max_bytes) { |
d89c8fdf | 707 | |
349cc4a5 | 708 | #if HAVE_XZ |
355b59e2 ZJS |
709 | _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
710 | lzma_ret ret; | |
711 | ||
712 | uint8_t buf[BUFSIZ], out[BUFSIZ]; | |
713 | lzma_action action = LZMA_RUN; | |
714 | ||
715 | assert(fdf >= 0); | |
716 | assert(fdt >= 0); | |
717 | ||
718 | ret = lzma_stream_decoder(&s, UINT64_MAX, 0); | |
d7a0f1f4 FS |
719 | if (ret != LZMA_OK) |
720 | return log_debug_errno(SYNTHETIC_ERRNO(ENOMEM), | |
721 | "Failed to initialize XZ decoder: code %u", | |
722 | ret); | |
355b59e2 ZJS |
723 | |
724 | for (;;) { | |
725 | if (s.avail_in == 0 && action == LZMA_RUN) { | |
726 | ssize_t n; | |
727 | ||
728 | n = read(fdf, buf, sizeof(buf)); | |
729 | if (n < 0) | |
730 | return -errno; | |
731 | if (n == 0) | |
732 | action = LZMA_FINISH; | |
733 | else { | |
734 | s.next_in = buf; | |
735 | s.avail_in = n; | |
736 | } | |
737 | } | |
738 | ||
739 | if (s.avail_out == 0) { | |
740 | s.next_out = out; | |
741 | s.avail_out = sizeof(out); | |
742 | } | |
743 | ||
744 | ret = lzma_code(&s, action); | |
d7a0f1f4 FS |
745 | if (!IN_SET(ret, LZMA_OK, LZMA_STREAM_END)) |
746 | return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), | |
747 | "Decompression failed: code %u", | |
748 | ret); | |
355b59e2 ZJS |
749 | |
750 | if (s.avail_out == 0 || ret == LZMA_STREAM_END) { | |
751 | ssize_t n, k; | |
752 | ||
753 | n = sizeof(out) - s.avail_out; | |
754 | ||
59f448cf LP |
755 | if (max_bytes != (uint64_t) -1) { |
756 | if (max_bytes < (uint64_t) n) | |
d89c8fdf | 757 | return -EFBIG; |
355b59e2 ZJS |
758 | |
759 | max_bytes -= n; | |
760 | } | |
761 | ||
355b59e2 ZJS |
762 | k = loop_write(fdt, out, n, false); |
763 | if (k < 0) | |
764 | return k; | |
355b59e2 ZJS |
765 | |
766 | if (ret == LZMA_STREAM_END) { | |
fa1c4b51 | 767 | log_debug("XZ decompression finished (%"PRIu64" -> %"PRIu64" bytes, %.1f%%)", |
355b59e2 ZJS |
768 | s.total_in, s.total_out, |
769 | (double) s.total_out / s.total_in * 100); | |
770 | ||
771 | return 0; | |
772 | } | |
773 | } | |
774 | } | |
d89c8fdf | 775 | #else |
d7a0f1f4 FS |
776 | return log_debug_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), |
777 | "Cannot decompress file. Compiled without XZ support."); | |
d89c8fdf ZJS |
778 | #endif |
779 | } | |
780 | ||
8e64dd1e | 781 | int decompress_stream_lz4(int in, int out, uint64_t max_bytes) { |
349cc4a5 | 782 | #if HAVE_LZ4 |
4b5bc539 ZJS |
783 | size_t c; |
784 | _cleanup_(LZ4F_freeDecompressionContextp) LZ4F_decompressionContext_t ctx = NULL; | |
785 | _cleanup_free_ char *buf = NULL; | |
786 | char *src; | |
787 | struct stat st; | |
788 | int r = 0; | |
789 | size_t total_in = 0, total_out = 0; | |
790 | ||
791 | c = LZ4F_createDecompressionContext(&ctx, LZ4F_VERSION); | |
792 | if (LZ4F_isError(c)) | |
793 | return -ENOMEM; | |
794 | ||
795 | if (fstat(in, &st) < 0) | |
5146f9f0 | 796 | return log_debug_errno(errno, "fstat() failed: %m"); |
4b5bc539 ZJS |
797 | |
798 | buf = malloc(LZ4_BUFSIZE); | |
799 | if (!buf) | |
800 | return -ENOMEM; | |
801 | ||
802 | src = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, in, 0); | |
e0685172 | 803 | if (src == MAP_FAILED) |
4b5bc539 ZJS |
804 | return -errno; |
805 | ||
806 | while (total_in < (size_t) st.st_size) { | |
807 | size_t produced = LZ4_BUFSIZE; | |
808 | size_t used = st.st_size - total_in; | |
809 | ||
810 | c = LZ4F_decompress(ctx, buf, &produced, src + total_in, &used, NULL); | |
811 | if (LZ4F_isError(c)) { | |
812 | r = -EBADMSG; | |
813 | goto cleanup; | |
814 | } | |
815 | ||
816 | total_in += used; | |
817 | total_out += produced; | |
818 | ||
819 | if (max_bytes != (uint64_t) -1 && total_out > (size_t) max_bytes) { | |
82e24b00 | 820 | log_debug("Decompressed stream longer than %"PRIu64" bytes", max_bytes); |
5146f9f0 | 821 | r = -EFBIG; |
4b5bc539 ZJS |
822 | goto cleanup; |
823 | } | |
824 | ||
825 | r = loop_write(out, buf, produced, false); | |
826 | if (r < 0) | |
827 | goto cleanup; | |
828 | } | |
829 | ||
830 | log_debug("LZ4 decompression finished (%zu -> %zu bytes, %.1f%%)", | |
831 | total_in, total_out, | |
25048348 | 832 | total_in > 0 ? (double) total_out / total_in * 100 : 0.0); |
4b5bc539 ZJS |
833 | cleanup: |
834 | munmap(src, st.st_size); | |
835 | return r; | |
d89c8fdf | 836 | #else |
d7a0f1f4 FS |
837 | return log_debug_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), |
838 | "Cannot decompress file. Compiled without LZ4 support."); | |
d89c8fdf ZJS |
839 | #endif |
840 | } | |
841 | ||
ef5924aa NL |
842 | int compress_stream_zstd(int fdf, int fdt, uint64_t max_bytes) { |
843 | #if HAVE_ZSTD | |
844 | _cleanup_(ZSTD_freeCCtxp) ZSTD_CCtx *cctx = NULL; | |
845 | _cleanup_free_ void *in_buff = NULL, *out_buff = NULL; | |
846 | size_t in_allocsize, out_allocsize; | |
847 | size_t z; | |
848 | uint64_t left = max_bytes, in_bytes = 0; | |
ef5924aa NL |
849 | |
850 | assert(fdf >= 0); | |
851 | assert(fdt >= 0); | |
852 | ||
853 | /* Create the context and buffers */ | |
854 | in_allocsize = ZSTD_CStreamInSize(); | |
855 | out_allocsize = ZSTD_CStreamOutSize(); | |
856 | in_buff = malloc(in_allocsize); | |
857 | out_buff = malloc(out_allocsize); | |
858 | cctx = ZSTD_createCCtx(); | |
859 | if (!cctx || !out_buff || !in_buff) | |
860 | return -ENOMEM; | |
861 | ||
ef5924aa NL |
862 | z = ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 1); |
863 | if (ZSTD_isError(z)) | |
864 | log_debug("Failed to enable ZSTD checksum, ignoring: %s", ZSTD_getErrorName(z)); | |
865 | ||
866 | /* This loop read from the input file, compresses that entire chunk, | |
867 | * and writes all output produced to the output file. | |
868 | */ | |
869 | for (;;) { | |
870 | bool is_last_chunk; | |
871 | ZSTD_inBuffer input = { | |
872 | .src = in_buff, | |
873 | .size = 0, | |
874 | .pos = 0 | |
875 | }; | |
876 | ssize_t red; | |
877 | ||
878 | red = loop_read(fdf, in_buff, in_allocsize, true); | |
879 | if (red < 0) | |
880 | return red; | |
881 | is_last_chunk = red == 0; | |
882 | ||
883 | in_bytes += (size_t) red; | |
884 | input.size = (size_t) red; | |
885 | ||
886 | for (bool finished = false; !finished;) { | |
887 | ZSTD_outBuffer output = { | |
888 | .dst = out_buff, | |
889 | .size = out_allocsize, | |
890 | .pos = 0 | |
891 | }; | |
892 | size_t remaining; | |
893 | ssize_t wrote; | |
894 | ||
895 | /* Compress into the output buffer and write all of the | |
896 | * output to the file so we can reuse the buffer next | |
897 | * iteration. | |
898 | */ | |
899 | remaining = ZSTD_compressStream2( | |
900 | cctx, &output, &input, | |
901 | is_last_chunk ? ZSTD_e_end : ZSTD_e_continue); | |
902 | ||
903 | if (ZSTD_isError(remaining)) { | |
904 | log_debug("ZSTD encoder failed: %s", ZSTD_getErrorName(remaining)); | |
905 | return zstd_ret_to_errno(remaining); | |
906 | } | |
907 | ||
908 | if (left < output.pos) | |
909 | return -EFBIG; | |
910 | ||
911 | wrote = loop_write(fdt, output.dst, output.pos, 1); | |
912 | if (wrote < 0) | |
913 | return wrote; | |
914 | ||
915 | left -= output.pos; | |
916 | ||
917 | /* If we're on the last chunk we're finished when zstd | |
918 | * returns 0, which means its consumed all the input AND | |
919 | * finished the frame. Otherwise, we're finished when | |
920 | * we've consumed all the input. | |
921 | */ | |
922 | finished = is_last_chunk ? (remaining == 0) : (input.pos == input.size); | |
923 | } | |
924 | ||
925 | /* zstd only returns 0 when the input is completely consumed */ | |
926 | assert(input.pos == input.size); | |
927 | if (is_last_chunk) | |
928 | break; | |
929 | } | |
930 | ||
89d36ce8 YW |
931 | if (in_bytes > 0) |
932 | log_debug("ZSTD compression finished (%" PRIu64 " -> %" PRIu64 " bytes, %.1f%%)", | |
933 | in_bytes, max_bytes - left, (double) (max_bytes - left) / in_bytes * 100); | |
934 | else | |
935 | log_debug("ZSTD compression finished (%" PRIu64 " -> %" PRIu64 " bytes)", | |
936 | in_bytes, max_bytes - left); | |
ef5924aa NL |
937 | |
938 | return 0; | |
939 | #else | |
940 | return -EPROTONOSUPPORT; | |
941 | #endif | |
942 | } | |
943 | ||
944 | int decompress_stream_zstd(int fdf, int fdt, uint64_t max_bytes) { | |
945 | #if HAVE_ZSTD | |
946 | _cleanup_(ZSTD_freeDCtxp) ZSTD_DCtx *dctx = NULL; | |
947 | _cleanup_free_ void *in_buff = NULL, *out_buff = NULL; | |
948 | size_t in_allocsize, out_allocsize; | |
949 | size_t last_result = 0; | |
950 | uint64_t left = max_bytes, in_bytes = 0; | |
951 | ||
952 | assert(fdf >= 0); | |
953 | assert(fdt >= 0); | |
954 | ||
955 | /* Create the context and buffers */ | |
956 | in_allocsize = ZSTD_DStreamInSize(); | |
957 | out_allocsize = ZSTD_DStreamOutSize(); | |
958 | in_buff = malloc(in_allocsize); | |
959 | out_buff = malloc(out_allocsize); | |
960 | dctx = ZSTD_createDCtx(); | |
961 | if (!dctx || !out_buff || !in_buff) | |
962 | return -ENOMEM; | |
963 | ||
964 | /* This loop assumes that the input file is one or more concatenated | |
965 | * zstd streams. This example won't work if there is trailing non-zstd | |
966 | * data at the end, but streaming decompression in general handles this | |
967 | * case. ZSTD_decompressStream() returns 0 exactly when the frame is | |
968 | * completed, and doesn't consume input after the frame. | |
969 | */ | |
970 | for (;;) { | |
971 | bool has_error = false; | |
972 | ZSTD_inBuffer input = { | |
973 | .src = in_buff, | |
974 | .size = 0, | |
975 | .pos = 0 | |
976 | }; | |
977 | ssize_t red; | |
978 | ||
979 | red = loop_read(fdf, in_buff, in_allocsize, true); | |
980 | if (red < 0) | |
981 | return red; | |
982 | if (red == 0) | |
983 | break; | |
984 | ||
985 | in_bytes += (size_t) red; | |
986 | input.size = (size_t) red; | |
987 | input.pos = 0; | |
988 | ||
989 | /* Given a valid frame, zstd won't consume the last byte of the | |
990 | * frame until it has flushed all of the decompressed data of | |
991 | * the frame. So input.pos < input.size means frame is not done | |
992 | * or there is still output available. | |
993 | */ | |
994 | while (input.pos < input.size) { | |
995 | ZSTD_outBuffer output = { | |
996 | .dst = out_buff, | |
997 | .size = out_allocsize, | |
998 | .pos = 0 | |
999 | }; | |
1000 | ssize_t wrote; | |
1001 | /* The return code is zero if the frame is complete, but | |
1002 | * there may be multiple frames concatenated together. | |
1003 | * Zstd will automatically reset the context when a | |
1004 | * frame is complete. Still, calling ZSTD_DCtx_reset() | |
1005 | * can be useful to reset the context to a clean state, | |
1006 | * for instance if the last decompression call returned | |
1007 | * an error. | |
1008 | */ | |
1009 | last_result = ZSTD_decompressStream(dctx, &output, &input); | |
1010 | if (ZSTD_isError(last_result)) { | |
1011 | has_error = true; | |
1012 | break; | |
1013 | } | |
1014 | ||
1015 | if (left < output.pos) | |
1016 | return -EFBIG; | |
1017 | ||
1018 | wrote = loop_write(fdt, output.dst, output.pos, 1); | |
1019 | if (wrote < 0) | |
1020 | return wrote; | |
1021 | ||
1022 | left -= output.pos; | |
1023 | } | |
1024 | if (has_error) | |
1025 | break; | |
1026 | } | |
1027 | ||
1028 | if (in_bytes == 0) | |
1029 | return log_debug_errno(SYNTHETIC_ERRNO(EBADMSG), "ZSTD decoder failed: no data read"); | |
1030 | ||
1031 | if (last_result != 0) { | |
1032 | /* The last return value from ZSTD_decompressStream did not end | |
1033 | * on a frame, but we reached the end of the file! We assume | |
1034 | * this is an error, and the input was truncated. | |
1035 | */ | |
1036 | log_debug("ZSTD decoder failed: %s", ZSTD_getErrorName(last_result)); | |
1037 | return zstd_ret_to_errno(last_result); | |
1038 | } | |
1039 | ||
1040 | log_debug( | |
1041 | "ZSTD decompression finished (%" PRIu64 " -> %" PRIu64 " bytes, %.1f%%)", | |
1042 | in_bytes, | |
1043 | max_bytes - left, | |
1044 | (double) (max_bytes - left) / in_bytes * 100); | |
1045 | return 0; | |
1046 | #else | |
d7a0f1f4 FS |
1047 | return log_debug_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), |
1048 | "Cannot decompress file. Compiled without ZSTD support."); | |
ef5924aa NL |
1049 | #endif |
1050 | } | |
1051 | ||
59f448cf | 1052 | int decompress_stream(const char *filename, int fdf, int fdt, uint64_t max_bytes) { |
d89c8fdf ZJS |
1053 | |
1054 | if (endswith(filename, ".lz4")) | |
1055 | return decompress_stream_lz4(fdf, fdt, max_bytes); | |
1056 | else if (endswith(filename, ".xz")) | |
1057 | return decompress_stream_xz(fdf, fdt, max_bytes); | |
ef5924aa NL |
1058 | else if (endswith(filename, ".zst")) |
1059 | return decompress_stream_zstd(fdf, fdt, max_bytes); | |
d89c8fdf ZJS |
1060 | else |
1061 | return -EPROTONOSUPPORT; | |
355b59e2 | 1062 | } |