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e4e61fdb LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
e4e61fdb LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
e4e61fdb | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
e4e61fdb LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
e4e61fdb LP |
22 | #include <stdlib.h> |
23 | #include <string.h> | |
4b5bc539 | 24 | #include <sys/mman.h> |
07630cea | 25 | #include <unistd.h> |
d89c8fdf ZJS |
26 | |
27 | #ifdef HAVE_XZ | |
28 | # include <lzma.h> | |
29 | #endif | |
30 | ||
31 | #ifdef HAVE_LZ4 | |
32 | # include <lz4.h> | |
4b5bc539 | 33 | # include <lz4frame.h> |
d89c8fdf | 34 | #endif |
e4e61fdb | 35 | |
07630cea | 36 | #include "journal-def.h" |
355b59e2 | 37 | #include "macro.h" |
d89c8fdf | 38 | #include "sparse-endian.h" |
07630cea LP |
39 | #include "string-util.h" |
40 | #include "util.h" | |
41 | #include "compress.h" | |
d89c8fdf | 42 | |
4b5bc539 ZJS |
43 | #ifdef HAVE_LZ4 |
44 | DEFINE_TRIVIAL_CLEANUP_FUNC(LZ4F_compressionContext_t, LZ4F_freeCompressionContext); | |
45 | DEFINE_TRIVIAL_CLEANUP_FUNC(LZ4F_decompressionContext_t, LZ4F_freeDecompressionContext); | |
46 | #endif | |
47 | ||
d89c8fdf ZJS |
48 | #define ALIGN_8(l) ALIGN_TO(l, sizeof(size_t)) |
49 | ||
50 | static const char* const object_compressed_table[_OBJECT_COMPRESSED_MAX] = { | |
51 | [OBJECT_COMPRESSED_XZ] = "XZ", | |
52 | [OBJECT_COMPRESSED_LZ4] = "LZ4", | |
53 | }; | |
e4e61fdb | 54 | |
d89c8fdf ZJS |
55 | DEFINE_STRING_TABLE_LOOKUP(object_compressed, int); |
56 | ||
fa1c4b51 | 57 | int compress_blob_xz(const void *src, uint64_t src_size, void *dst, size_t *dst_size) { |
d89c8fdf | 58 | #ifdef HAVE_XZ |
1930eed2 JS |
59 | static const lzma_options_lzma opt = { |
60 | 1u << 20u, NULL, 0, LZMA_LC_DEFAULT, LZMA_LP_DEFAULT, | |
61 | LZMA_PB_DEFAULT, LZMA_MODE_FAST, 128, LZMA_MF_HC3, 4}; | |
62 | static const lzma_filter filters[2] = { | |
63 | {LZMA_FILTER_LZMA2, (lzma_options_lzma*) &opt}, | |
64 | {LZMA_VLI_UNKNOWN, NULL} | |
65 | }; | |
e4e61fdb | 66 | lzma_ret ret; |
76cc0bf6 | 67 | size_t out_pos = 0; |
e4e61fdb LP |
68 | |
69 | assert(src); | |
70 | assert(src_size > 0); | |
71 | assert(dst); | |
72 | assert(dst_size); | |
73 | ||
d89c8fdf | 74 | /* Returns < 0 if we couldn't compress the data or the |
e4e61fdb LP |
75 | * compressed result is longer than the original */ |
76 | ||
1930eed2 JS |
77 | if (src_size < 80) |
78 | return -ENOBUFS; | |
79 | ||
80 | ret = lzma_stream_buffer_encode((lzma_filter*) filters, LZMA_CHECK_NONE, NULL, | |
81 | src, src_size, dst, &out_pos, src_size - 1); | |
e4e61fdb | 82 | if (ret != LZMA_OK) |
d89c8fdf | 83 | return -ENOBUFS; |
e4e61fdb | 84 | |
76cc0bf6 | 85 | *dst_size = out_pos; |
d89c8fdf ZJS |
86 | return 0; |
87 | #else | |
88 | return -EPROTONOSUPPORT; | |
89 | #endif | |
e4e61fdb LP |
90 | } |
91 | ||
fa1c4b51 | 92 | int compress_blob_lz4(const void *src, uint64_t src_size, void *dst, size_t *dst_size) { |
d89c8fdf ZJS |
93 | #ifdef HAVE_LZ4 |
94 | int r; | |
95 | ||
96 | assert(src); | |
97 | assert(src_size > 0); | |
98 | assert(dst); | |
99 | assert(dst_size); | |
100 | ||
101 | /* Returns < 0 if we couldn't compress the data or the | |
102 | * compressed result is longer than the original */ | |
103 | ||
104 | if (src_size < 9) | |
105 | return -ENOBUFS; | |
e4e61fdb | 106 | |
d89c8fdf ZJS |
107 | r = LZ4_compress_limitedOutput(src, dst + 8, src_size, src_size - 8 - 1); |
108 | if (r <= 0) | |
109 | return -ENOBUFS; | |
110 | ||
111 | *(le64_t*) dst = htole64(src_size); | |
112 | *dst_size = r + 8; | |
113 | ||
114 | return 0; | |
115 | #else | |
116 | return -EPROTONOSUPPORT; | |
117 | #endif | |
118 | } | |
119 | ||
120 | ||
121 | int decompress_blob_xz(const void *src, uint64_t src_size, | |
fa1c4b51 | 122 | void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max) { |
d89c8fdf ZJS |
123 | |
124 | #ifdef HAVE_XZ | |
5e592c66 | 125 | _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
e4e61fdb | 126 | lzma_ret ret; |
fa1c4b51 | 127 | size_t space; |
e4e61fdb LP |
128 | |
129 | assert(src); | |
130 | assert(src_size > 0); | |
131 | assert(dst); | |
132 | assert(dst_alloc_size); | |
133 | assert(dst_size); | |
134 | assert(*dst_alloc_size == 0 || *dst); | |
135 | ||
136 | ret = lzma_stream_decoder(&s, UINT64_MAX, 0); | |
137 | if (ret != LZMA_OK) | |
d89c8fdf | 138 | return -ENOMEM; |
e4e61fdb | 139 | |
fa1c4b51 | 140 | space = MIN(src_size * 2, dst_max ?: (size_t) -1); |
5e592c66 | 141 | if (!greedy_realloc(dst, dst_alloc_size, space, 1)) |
01c3322e | 142 | return -ENOMEM; |
e4e61fdb LP |
143 | |
144 | s.next_in = src; | |
145 | s.avail_in = src_size; | |
146 | ||
147 | s.next_out = *dst; | |
93b73b06 | 148 | s.avail_out = space; |
e4e61fdb LP |
149 | |
150 | for (;;) { | |
fa1c4b51 | 151 | size_t used; |
e4e61fdb LP |
152 | |
153 | ret = lzma_code(&s, LZMA_FINISH); | |
154 | ||
155 | if (ret == LZMA_STREAM_END) | |
156 | break; | |
d89c8fdf ZJS |
157 | else if (ret != LZMA_OK) |
158 | return -ENOMEM; | |
e4e61fdb | 159 | |
93b73b06 LP |
160 | if (dst_max > 0 && (space - s.avail_out) >= dst_max) |
161 | break; | |
d89c8fdf ZJS |
162 | else if (dst_max > 0 && space == dst_max) |
163 | return -ENOBUFS; | |
93b73b06 | 164 | |
5e592c66 | 165 | used = space - s.avail_out; |
fa1c4b51 | 166 | space = MIN(2 * space, dst_max ?: (size_t) -1); |
5e592c66 | 167 | if (!greedy_realloc(dst, dst_alloc_size, space, 1)) |
01c3322e | 168 | return -ENOMEM; |
e4e61fdb | 169 | |
5e592c66 ZJS |
170 | s.avail_out = space - used; |
171 | s.next_out = *dst + used; | |
e4e61fdb LP |
172 | } |
173 | ||
93b73b06 | 174 | *dst_size = space - s.avail_out; |
d89c8fdf ZJS |
175 | return 0; |
176 | #else | |
177 | return -EPROTONOSUPPORT; | |
178 | #endif | |
e4e61fdb LP |
179 | } |
180 | ||
d89c8fdf | 181 | int decompress_blob_lz4(const void *src, uint64_t src_size, |
fa1c4b51 | 182 | void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max) { |
d89c8fdf ZJS |
183 | |
184 | #ifdef HAVE_LZ4 | |
185 | char* out; | |
fa1c4b51 | 186 | int r, size; /* LZ4 uses int for size */ |
e4e61fdb | 187 | |
d89c8fdf ZJS |
188 | assert(src); |
189 | assert(src_size > 0); | |
190 | assert(dst); | |
191 | assert(dst_alloc_size); | |
192 | assert(dst_size); | |
193 | assert(*dst_alloc_size == 0 || *dst); | |
194 | ||
195 | if (src_size <= 8) | |
196 | return -EBADMSG; | |
197 | ||
198 | size = le64toh( *(le64_t*)src ); | |
fa1c4b51 ZJS |
199 | if (size < 0 || (le64_t) size != *(le64_t*)src) |
200 | return -EFBIG; | |
201 | if ((size_t) size > *dst_alloc_size) { | |
d89c8fdf ZJS |
202 | out = realloc(*dst, size); |
203 | if (!out) | |
204 | return -ENOMEM; | |
205 | *dst = out; | |
206 | *dst_alloc_size = size; | |
207 | } else | |
208 | out = *dst; | |
209 | ||
210 | r = LZ4_decompress_safe(src + 8, out, src_size - 8, size); | |
fa1c4b51 | 211 | if (r < 0 || r != size) |
d89c8fdf ZJS |
212 | return -EBADMSG; |
213 | ||
214 | *dst_size = size; | |
215 | return 0; | |
216 | #else | |
217 | return -EPROTONOSUPPORT; | |
218 | #endif | |
219 | } | |
220 | ||
221 | int decompress_blob(int compression, | |
222 | const void *src, uint64_t src_size, | |
fa1c4b51 | 223 | void **dst, size_t *dst_alloc_size, size_t* dst_size, size_t dst_max) { |
d89c8fdf ZJS |
224 | if (compression == OBJECT_COMPRESSED_XZ) |
225 | return decompress_blob_xz(src, src_size, | |
226 | dst, dst_alloc_size, dst_size, dst_max); | |
227 | else if (compression == OBJECT_COMPRESSED_LZ4) | |
228 | return decompress_blob_lz4(src, src_size, | |
229 | dst, dst_alloc_size, dst_size, dst_max); | |
230 | else | |
231 | return -EBADMSG; | |
232 | } | |
233 | ||
234 | ||
235 | int decompress_startswith_xz(const void *src, uint64_t src_size, | |
fa1c4b51 ZJS |
236 | void **buffer, size_t *buffer_size, |
237 | const void *prefix, size_t prefix_len, | |
d89c8fdf ZJS |
238 | uint8_t extra) { |
239 | ||
240 | #ifdef HAVE_XZ | |
5e592c66 | 241 | _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
e4e61fdb | 242 | lzma_ret ret; |
e4e61fdb | 243 | |
d89c8fdf | 244 | /* Checks whether the decompressed blob starts with the |
e4e61fdb LP |
245 | * mentioned prefix. The byte extra needs to follow the |
246 | * prefix */ | |
247 | ||
248 | assert(src); | |
249 | assert(src_size > 0); | |
250 | assert(buffer); | |
251 | assert(buffer_size); | |
252 | assert(prefix); | |
253 | assert(*buffer_size == 0 || *buffer); | |
254 | ||
255 | ret = lzma_stream_decoder(&s, UINT64_MAX, 0); | |
256 | if (ret != LZMA_OK) | |
d89c8fdf | 257 | return -EBADMSG; |
e4e61fdb | 258 | |
d89c8fdf ZJS |
259 | if (!(greedy_realloc(buffer, buffer_size, ALIGN_8(prefix_len + 1), 1))) |
260 | return -ENOMEM; | |
e4e61fdb LP |
261 | |
262 | s.next_in = src; | |
263 | s.avail_in = src_size; | |
264 | ||
265 | s.next_out = *buffer; | |
266 | s.avail_out = *buffer_size; | |
267 | ||
268 | for (;;) { | |
e4e61fdb LP |
269 | ret = lzma_code(&s, LZMA_FINISH); |
270 | ||
271 | if (ret != LZMA_STREAM_END && ret != LZMA_OK) | |
d89c8fdf | 272 | return -EBADMSG; |
e4e61fdb | 273 | |
5e592c66 ZJS |
274 | if (*buffer_size - s.avail_out >= prefix_len + 1) |
275 | return memcmp(*buffer, prefix, prefix_len) == 0 && | |
276 | ((const uint8_t*) *buffer)[prefix_len] == extra; | |
e4e61fdb LP |
277 | |
278 | if (ret == LZMA_STREAM_END) | |
d89c8fdf | 279 | return 0; |
e4e61fdb | 280 | |
e4e61fdb LP |
281 | s.avail_out += *buffer_size; |
282 | ||
5e592c66 | 283 | if (!(greedy_realloc(buffer, buffer_size, *buffer_size * 2, 1))) |
d89c8fdf | 284 | return -ENOMEM; |
e4e61fdb | 285 | |
5e592c66 ZJS |
286 | s.next_out = *buffer + *buffer_size - s.avail_out; |
287 | } | |
d89c8fdf ZJS |
288 | |
289 | #else | |
290 | return -EPROTONOSUPPORT; | |
291 | #endif | |
292 | } | |
293 | ||
294 | int decompress_startswith_lz4(const void *src, uint64_t src_size, | |
fa1c4b51 ZJS |
295 | void **buffer, size_t *buffer_size, |
296 | const void *prefix, size_t prefix_len, | |
d89c8fdf ZJS |
297 | uint8_t extra) { |
298 | #ifdef HAVE_LZ4 | |
299 | /* Checks whether the decompressed blob starts with the | |
300 | * mentioned prefix. The byte extra needs to follow the | |
301 | * prefix */ | |
302 | ||
303 | int r; | |
304 | ||
305 | assert(src); | |
306 | assert(src_size > 0); | |
307 | assert(buffer); | |
308 | assert(buffer_size); | |
309 | assert(prefix); | |
310 | assert(*buffer_size == 0 || *buffer); | |
311 | ||
312 | if (src_size <= 8) | |
313 | return -EBADMSG; | |
314 | ||
315 | if (!(greedy_realloc(buffer, buffer_size, ALIGN_8(prefix_len + 1), 1))) | |
316 | return -ENOMEM; | |
317 | ||
318 | r = LZ4_decompress_safe_partial(src + 8, *buffer, src_size - 8, | |
319 | prefix_len + 1, *buffer_size); | |
320 | ||
321 | if (r < 0) | |
322 | return -EBADMSG; | |
323 | if ((unsigned) r >= prefix_len + 1) | |
324 | return memcmp(*buffer, prefix, prefix_len) == 0 && | |
325 | ((const uint8_t*) *buffer)[prefix_len] == extra; | |
326 | else | |
327 | return 0; | |
328 | ||
329 | #else | |
330 | return -EPROTONOSUPPORT; | |
331 | #endif | |
e4e61fdb | 332 | } |
355b59e2 | 333 | |
d89c8fdf ZJS |
334 | int decompress_startswith(int compression, |
335 | const void *src, uint64_t src_size, | |
fa1c4b51 ZJS |
336 | void **buffer, size_t *buffer_size, |
337 | const void *prefix, size_t prefix_len, | |
d89c8fdf ZJS |
338 | uint8_t extra) { |
339 | if (compression == OBJECT_COMPRESSED_XZ) | |
340 | return decompress_startswith_xz(src, src_size, | |
341 | buffer, buffer_size, | |
342 | prefix, prefix_len, | |
343 | extra); | |
344 | else if (compression == OBJECT_COMPRESSED_LZ4) | |
345 | return decompress_startswith_lz4(src, src_size, | |
346 | buffer, buffer_size, | |
347 | prefix, prefix_len, | |
348 | extra); | |
349 | else | |
350 | return -EBADMSG; | |
351 | } | |
352 | ||
59f448cf | 353 | int compress_stream_xz(int fdf, int fdt, uint64_t max_bytes) { |
3b1a55e1 | 354 | #ifdef HAVE_XZ |
355b59e2 ZJS |
355 | _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
356 | lzma_ret ret; | |
355b59e2 ZJS |
357 | uint8_t buf[BUFSIZ], out[BUFSIZ]; |
358 | lzma_action action = LZMA_RUN; | |
359 | ||
360 | assert(fdf >= 0); | |
361 | assert(fdt >= 0); | |
362 | ||
d89c8fdf | 363 | ret = lzma_easy_encoder(&s, LZMA_PRESET_DEFAULT, LZMA_CHECK_CRC64); |
355b59e2 | 364 | if (ret != LZMA_OK) { |
1fa2f38f | 365 | log_error("Failed to initialize XZ encoder: code %u", ret); |
355b59e2 ZJS |
366 | return -EINVAL; |
367 | } | |
368 | ||
369 | for (;;) { | |
370 | if (s.avail_in == 0 && action == LZMA_RUN) { | |
371 | size_t m = sizeof(buf); | |
372 | ssize_t n; | |
373 | ||
59f448cf LP |
374 | if (max_bytes != (uint64_t) -1 && (uint64_t) m > max_bytes) |
375 | m = (size_t) max_bytes; | |
355b59e2 ZJS |
376 | |
377 | n = read(fdf, buf, m); | |
378 | if (n < 0) | |
379 | return -errno; | |
380 | if (n == 0) | |
381 | action = LZMA_FINISH; | |
382 | else { | |
383 | s.next_in = buf; | |
384 | s.avail_in = n; | |
385 | ||
59f448cf LP |
386 | if (max_bytes != (uint64_t) -1) { |
387 | assert(max_bytes >= (uint64_t) n); | |
355b59e2 ZJS |
388 | max_bytes -= n; |
389 | } | |
390 | } | |
391 | } | |
392 | ||
393 | if (s.avail_out == 0) { | |
394 | s.next_out = out; | |
395 | s.avail_out = sizeof(out); | |
396 | } | |
397 | ||
398 | ret = lzma_code(&s, action); | |
399 | if (ret != LZMA_OK && ret != LZMA_STREAM_END) { | |
1fa2f38f | 400 | log_error("Compression failed: code %u", ret); |
355b59e2 ZJS |
401 | return -EBADMSG; |
402 | } | |
403 | ||
404 | if (s.avail_out == 0 || ret == LZMA_STREAM_END) { | |
405 | ssize_t n, k; | |
406 | ||
407 | n = sizeof(out) - s.avail_out; | |
408 | ||
355b59e2 ZJS |
409 | k = loop_write(fdt, out, n, false); |
410 | if (k < 0) | |
411 | return k; | |
355b59e2 ZJS |
412 | |
413 | if (ret == LZMA_STREAM_END) { | |
fa1c4b51 | 414 | log_debug("XZ compression finished (%"PRIu64" -> %"PRIu64" bytes, %.1f%%)", |
355b59e2 ZJS |
415 | s.total_in, s.total_out, |
416 | (double) s.total_out / s.total_in * 100); | |
417 | ||
418 | return 0; | |
419 | } | |
420 | } | |
421 | } | |
3b1a55e1 ZJS |
422 | #else |
423 | return -EPROTONOSUPPORT; | |
424 | #endif | |
355b59e2 ZJS |
425 | } |
426 | ||
4b5bc539 | 427 | #define LZ4_BUFSIZE (512*1024u) |
d89c8fdf | 428 | |
59f448cf | 429 | int compress_stream_lz4(int fdf, int fdt, uint64_t max_bytes) { |
d89c8fdf ZJS |
430 | |
431 | #ifdef HAVE_LZ4 | |
4b5bc539 ZJS |
432 | LZ4F_errorCode_t c; |
433 | _cleanup_(LZ4F_freeCompressionContextp) LZ4F_compressionContext_t ctx = NULL; | |
434 | _cleanup_free_ char *buf = NULL; | |
435 | char *src = NULL; | |
436 | size_t size, n, total_in = 0, total_out = 0, offset = 0, frame_size; | |
437 | struct stat st; | |
438 | int r; | |
439 | static const LZ4F_compressOptions_t options = { | |
440 | .stableSrc = 1, | |
441 | }; | |
442 | static const LZ4F_preferences_t preferences = { | |
443 | .frameInfo.blockSizeID = 5, | |
444 | }; | |
d89c8fdf | 445 | |
4b5bc539 ZJS |
446 | c = LZ4F_createCompressionContext(&ctx, LZ4F_VERSION); |
447 | if (LZ4F_isError(c)) | |
448 | return -ENOMEM; | |
d89c8fdf | 449 | |
4b5bc539 | 450 | if (fstat(fdf, &st) < 0) |
5146f9f0 | 451 | return log_debug_errno(errno, "fstat() failed: %m"); |
d89c8fdf | 452 | |
4b5bc539 ZJS |
453 | frame_size = LZ4F_compressBound(LZ4_BUFSIZE, &preferences); |
454 | size = frame_size + 64*1024; /* add some space for header and trailer */ | |
455 | buf = malloc(size); | |
456 | if (!buf) | |
457 | return -ENOMEM; | |
d89c8fdf | 458 | |
4b5bc539 ZJS |
459 | n = offset = LZ4F_compressBegin(ctx, buf, size, &preferences); |
460 | if (LZ4F_isError(n)) | |
461 | return -EINVAL; | |
d89c8fdf | 462 | |
4b5bc539 | 463 | src = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fdf, 0); |
e0685172 | 464 | if (src == MAP_FAILED) |
4b5bc539 | 465 | return -errno; |
d89c8fdf | 466 | |
4b5bc539 | 467 | log_debug("Buffer size is %zu bytes, header size %zu bytes.", size, n); |
d89c8fdf | 468 | |
4b5bc539 ZJS |
469 | while (total_in < (size_t) st.st_size) { |
470 | ssize_t k; | |
d89c8fdf | 471 | |
4b5bc539 ZJS |
472 | k = MIN(LZ4_BUFSIZE, st.st_size - total_in); |
473 | n = LZ4F_compressUpdate(ctx, buf + offset, size - offset, | |
474 | src + total_in, k, &options); | |
475 | if (LZ4F_isError(n)) { | |
476 | r = -ENOTRECOVERABLE; | |
477 | goto cleanup; | |
d89c8fdf ZJS |
478 | } |
479 | ||
4b5bc539 ZJS |
480 | total_in += k; |
481 | offset += n; | |
482 | total_out += n; | |
d89c8fdf | 483 | |
4b5bc539 ZJS |
484 | if (max_bytes != (uint64_t) -1 && total_out > (size_t) max_bytes) { |
485 | log_debug("Compressed stream longer than %zd bytes", max_bytes); | |
486 | return -EFBIG; | |
487 | } | |
d89c8fdf | 488 | |
4b5bc539 | 489 | if (size - offset < frame_size + 4) { |
4b5bc539 ZJS |
490 | k = loop_write(fdt, buf, offset, false); |
491 | if (k < 0) { | |
492 | r = k; | |
493 | goto cleanup; | |
494 | } | |
495 | offset = 0; | |
496 | } | |
497 | } | |
d89c8fdf | 498 | |
4b5bc539 ZJS |
499 | n = LZ4F_compressEnd(ctx, buf + offset, size - offset, &options); |
500 | if (LZ4F_isError(n)) { | |
501 | r = -ENOTRECOVERABLE; | |
502 | goto cleanup; | |
d89c8fdf ZJS |
503 | } |
504 | ||
4b5bc539 ZJS |
505 | offset += n; |
506 | total_out += n; | |
4b5bc539 ZJS |
507 | r = loop_write(fdt, buf, offset, false); |
508 | if (r < 0) | |
509 | goto cleanup; | |
d89c8fdf ZJS |
510 | |
511 | log_debug("LZ4 compression finished (%zu -> %zu bytes, %.1f%%)", | |
512 | total_in, total_out, | |
513 | (double) total_out / total_in * 100); | |
4b5bc539 ZJS |
514 | cleanup: |
515 | munmap(src, st.st_size); | |
516 | return r; | |
d89c8fdf ZJS |
517 | #else |
518 | return -EPROTONOSUPPORT; | |
519 | #endif | |
520 | } | |
521 | ||
59f448cf | 522 | int decompress_stream_xz(int fdf, int fdt, uint64_t max_bytes) { |
d89c8fdf ZJS |
523 | |
524 | #ifdef HAVE_XZ | |
355b59e2 ZJS |
525 | _cleanup_(lzma_end) lzma_stream s = LZMA_STREAM_INIT; |
526 | lzma_ret ret; | |
527 | ||
528 | uint8_t buf[BUFSIZ], out[BUFSIZ]; | |
529 | lzma_action action = LZMA_RUN; | |
530 | ||
531 | assert(fdf >= 0); | |
532 | assert(fdt >= 0); | |
533 | ||
534 | ret = lzma_stream_decoder(&s, UINT64_MAX, 0); | |
535 | if (ret != LZMA_OK) { | |
5146f9f0 | 536 | log_debug("Failed to initialize XZ decoder: code %u", ret); |
d89c8fdf | 537 | return -ENOMEM; |
355b59e2 ZJS |
538 | } |
539 | ||
540 | for (;;) { | |
541 | if (s.avail_in == 0 && action == LZMA_RUN) { | |
542 | ssize_t n; | |
543 | ||
544 | n = read(fdf, buf, sizeof(buf)); | |
545 | if (n < 0) | |
546 | return -errno; | |
547 | if (n == 0) | |
548 | action = LZMA_FINISH; | |
549 | else { | |
550 | s.next_in = buf; | |
551 | s.avail_in = n; | |
552 | } | |
553 | } | |
554 | ||
555 | if (s.avail_out == 0) { | |
556 | s.next_out = out; | |
557 | s.avail_out = sizeof(out); | |
558 | } | |
559 | ||
560 | ret = lzma_code(&s, action); | |
561 | if (ret != LZMA_OK && ret != LZMA_STREAM_END) { | |
5146f9f0 | 562 | log_debug("Decompression failed: code %u", ret); |
355b59e2 ZJS |
563 | return -EBADMSG; |
564 | } | |
565 | ||
566 | if (s.avail_out == 0 || ret == LZMA_STREAM_END) { | |
567 | ssize_t n, k; | |
568 | ||
569 | n = sizeof(out) - s.avail_out; | |
570 | ||
59f448cf LP |
571 | if (max_bytes != (uint64_t) -1) { |
572 | if (max_bytes < (uint64_t) n) | |
d89c8fdf | 573 | return -EFBIG; |
355b59e2 ZJS |
574 | |
575 | max_bytes -= n; | |
576 | } | |
577 | ||
355b59e2 ZJS |
578 | k = loop_write(fdt, out, n, false); |
579 | if (k < 0) | |
580 | return k; | |
355b59e2 ZJS |
581 | |
582 | if (ret == LZMA_STREAM_END) { | |
fa1c4b51 | 583 | log_debug("XZ decompression finished (%"PRIu64" -> %"PRIu64" bytes, %.1f%%)", |
355b59e2 ZJS |
584 | s.total_in, s.total_out, |
585 | (double) s.total_out / s.total_in * 100); | |
586 | ||
587 | return 0; | |
588 | } | |
589 | } | |
590 | } | |
d89c8fdf | 591 | #else |
5146f9f0 | 592 | log_debug("Cannot decompress file. Compiled without XZ support."); |
d89c8fdf ZJS |
593 | return -EPROTONOSUPPORT; |
594 | #endif | |
595 | } | |
596 | ||
d89c8fdf | 597 | #ifdef HAVE_LZ4 |
4b5bc539 ZJS |
598 | static int decompress_stream_lz4_v1(int fdf, int fdt, uint64_t max_bytes) { |
599 | ||
d89c8fdf ZJS |
600 | _cleanup_free_ char *buf = NULL, *out = NULL; |
601 | size_t buf_size = 0; | |
602 | LZ4_streamDecode_t lz4_data = {}; | |
603 | le32_t header; | |
604 | size_t total_in = sizeof(header), total_out = 0; | |
605 | ||
606 | assert(fdf >= 0); | |
607 | assert(fdt >= 0); | |
608 | ||
609 | out = malloc(4*LZ4_BUFSIZE); | |
610 | if (!out) | |
5146f9f0 | 611 | return -ENOMEM; |
d89c8fdf ZJS |
612 | |
613 | for (;;) { | |
a6dcc7e5 | 614 | ssize_t m; |
d89c8fdf ZJS |
615 | int r; |
616 | ||
a6dcc7e5 ZJS |
617 | r = loop_read_exact(fdf, &header, sizeof(header), false); |
618 | if (r < 0) | |
619 | return r; | |
d89c8fdf ZJS |
620 | |
621 | m = le32toh(header); | |
622 | if (m == 0) | |
623 | break; | |
624 | ||
625 | /* We refuse to use a bigger decompression buffer than | |
626 | * the one used for compression by 4 times. This means | |
627 | * that compression buffer size can be enlarged 4 | |
628 | * times. This can be changed, but old binaries might | |
629 | * not accept buffers compressed by newer binaries then. | |
630 | */ | |
631 | if (m > LZ4_COMPRESSBOUND(LZ4_BUFSIZE * 4)) { | |
5146f9f0 ZJS |
632 | log_debug("Compressed stream block too big: %zd bytes", m); |
633 | return -ENOBUFS; | |
d89c8fdf ZJS |
634 | } |
635 | ||
636 | total_in += sizeof(header) + m; | |
637 | ||
638 | if (!GREEDY_REALLOC(buf, buf_size, m)) | |
5146f9f0 | 639 | return -ENOMEM; |
d89c8fdf | 640 | |
a6dcc7e5 ZJS |
641 | r = loop_read_exact(fdf, buf, m, false); |
642 | if (r < 0) | |
643 | return r; | |
d89c8fdf ZJS |
644 | |
645 | r = LZ4_decompress_safe_continue(&lz4_data, buf, out, m, 4*LZ4_BUFSIZE); | |
5146f9f0 ZJS |
646 | if (r <= 0) { |
647 | log_debug("LZ4 decompression failed (legacy format)."); | |
648 | return -EBADMSG; | |
649 | } | |
d89c8fdf ZJS |
650 | |
651 | total_out += r; | |
652 | ||
59f448cf LP |
653 | if (max_bytes != (uint64_t) -1 && (uint64_t) total_out > max_bytes) { |
654 | log_debug("Decompressed stream longer than %" PRIu64 " bytes", max_bytes); | |
d89c8fdf ZJS |
655 | return -EFBIG; |
656 | } | |
657 | ||
a6dcc7e5 ZJS |
658 | r = loop_write(fdt, out, r, false); |
659 | if (r < 0) | |
660 | return r; | |
d89c8fdf ZJS |
661 | } |
662 | ||
4b5bc539 | 663 | log_debug("LZ4 decompression finished (legacy format, %zu -> %zu bytes, %.1f%%)", |
d89c8fdf ZJS |
664 | total_in, total_out, |
665 | (double) total_out / total_in * 100); | |
666 | ||
667 | return 0; | |
4b5bc539 ZJS |
668 | } |
669 | ||
670 | static int decompress_stream_lz4_v2(int in, int out, uint64_t max_bytes) { | |
671 | size_t c; | |
672 | _cleanup_(LZ4F_freeDecompressionContextp) LZ4F_decompressionContext_t ctx = NULL; | |
673 | _cleanup_free_ char *buf = NULL; | |
674 | char *src; | |
675 | struct stat st; | |
676 | int r = 0; | |
677 | size_t total_in = 0, total_out = 0; | |
678 | ||
679 | c = LZ4F_createDecompressionContext(&ctx, LZ4F_VERSION); | |
680 | if (LZ4F_isError(c)) | |
681 | return -ENOMEM; | |
682 | ||
683 | if (fstat(in, &st) < 0) | |
5146f9f0 | 684 | return log_debug_errno(errno, "fstat() failed: %m"); |
4b5bc539 ZJS |
685 | |
686 | buf = malloc(LZ4_BUFSIZE); | |
687 | if (!buf) | |
688 | return -ENOMEM; | |
689 | ||
690 | src = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, in, 0); | |
e0685172 | 691 | if (src == MAP_FAILED) |
4b5bc539 ZJS |
692 | return -errno; |
693 | ||
694 | while (total_in < (size_t) st.st_size) { | |
695 | size_t produced = LZ4_BUFSIZE; | |
696 | size_t used = st.st_size - total_in; | |
697 | ||
698 | c = LZ4F_decompress(ctx, buf, &produced, src + total_in, &used, NULL); | |
699 | if (LZ4F_isError(c)) { | |
700 | r = -EBADMSG; | |
701 | goto cleanup; | |
702 | } | |
703 | ||
704 | total_in += used; | |
705 | total_out += produced; | |
706 | ||
707 | if (max_bytes != (uint64_t) -1 && total_out > (size_t) max_bytes) { | |
5146f9f0 ZJS |
708 | log_debug("Decompressed stream longer than %zd bytes", max_bytes); |
709 | r = -EFBIG; | |
4b5bc539 ZJS |
710 | goto cleanup; |
711 | } | |
712 | ||
713 | r = loop_write(out, buf, produced, false); | |
714 | if (r < 0) | |
715 | goto cleanup; | |
716 | } | |
717 | ||
718 | log_debug("LZ4 decompression finished (%zu -> %zu bytes, %.1f%%)", | |
719 | total_in, total_out, | |
720 | (double) total_out / total_in * 100); | |
721 | cleanup: | |
722 | munmap(src, st.st_size); | |
723 | return r; | |
724 | } | |
725 | #endif | |
726 | ||
727 | int decompress_stream_lz4(int fdf, int fdt, uint64_t max_bytes) { | |
728 | #ifdef HAVE_LZ4 | |
729 | int r; | |
730 | ||
731 | r = decompress_stream_lz4_v2(fdf, fdt, max_bytes); | |
732 | if (r == -EBADMSG) | |
733 | r = decompress_stream_lz4_v1(fdf, fdt, max_bytes); | |
734 | return r; | |
d89c8fdf | 735 | #else |
5146f9f0 | 736 | log_debug("Cannot decompress file. Compiled without LZ4 support."); |
d89c8fdf ZJS |
737 | return -EPROTONOSUPPORT; |
738 | #endif | |
739 | } | |
740 | ||
59f448cf | 741 | int decompress_stream(const char *filename, int fdf, int fdt, uint64_t max_bytes) { |
d89c8fdf ZJS |
742 | |
743 | if (endswith(filename, ".lz4")) | |
744 | return decompress_stream_lz4(fdf, fdt, max_bytes); | |
745 | else if (endswith(filename, ".xz")) | |
746 | return decompress_stream_xz(fdf, fdt, max_bytes); | |
747 | else | |
748 | return -EPROTONOSUPPORT; | |
355b59e2 | 749 | } |