]>
Commit | Line | Data |
---|---|---|
46bf0438 JH |
1 | /* |
2 | * Copyright (c) 2011, Google Inc. | |
3 | */ | |
4 | #include "cache.h" | |
32a8f510 | 5 | #include "environment.h" |
46bf0438 | 6 | #include "streaming.h" |
e35454fa SB |
7 | #include "repository.h" |
8 | #include "object-store.h" | |
47f351e9 | 9 | #include "replace-object.h" |
84f80ad5 | 10 | #include "packfile.h" |
d5ebb50d | 11 | #include "wrapper.h" |
46bf0438 | 12 | |
46bf0438 | 13 | typedef int (*open_istream_fn)(struct git_istream *, |
c8123e72 | 14 | struct repository *, |
575042a0 | 15 | const struct object_id *, |
46bf0438 JH |
16 | enum object_type *); |
17 | typedef int (*close_istream_fn)(struct git_istream *); | |
18 | typedef ssize_t (*read_istream_fn)(struct git_istream *, char *, size_t); | |
19 | ||
b6691092 JH |
20 | #define FILTER_BUFFER (1024*16) |
21 | ||
22 | struct filtered_istream { | |
23 | struct git_istream *upstream; | |
24 | struct stream_filter *filter; | |
25 | char ibuf[FILTER_BUFFER]; | |
26 | char obuf[FILTER_BUFFER]; | |
27 | int i_end, i_ptr; | |
28 | int o_end, o_ptr; | |
4ae66704 | 29 | int input_finished; |
b6691092 JH |
30 | }; |
31 | ||
46bf0438 | 32 | struct git_istream { |
d4e2d15a ÆAB |
33 | open_istream_fn open; |
34 | close_istream_fn close; | |
35 | read_istream_fn read; | |
36 | ||
46bf0438 | 37 | unsigned long size; /* inflated size of full object */ |
eb4f4076 | 38 | git_zstream z; |
7ef2d9a2 | 39 | enum { z_unused, z_used, z_done, z_error } z_state; |
46bf0438 JH |
40 | |
41 | union { | |
42 | struct { | |
34728d7f | 43 | char *buf; /* from oid_object_info_extended() */ |
46bf0438 JH |
44 | unsigned long read_ptr; |
45 | } incore; | |
46 | ||
47 | struct { | |
93aa7bd5 JH |
48 | void *mapped; |
49 | unsigned long mapsize; | |
50 | char hdr[32]; | |
51 | int hdr_avail; | |
52 | int hdr_used; | |
46bf0438 JH |
53 | } loose; |
54 | ||
55 | struct { | |
7ef2d9a2 JH |
56 | struct packed_git *pack; |
57 | off_t pos; | |
46bf0438 | 58 | } in_pack; |
b6691092 JH |
59 | |
60 | struct filtered_istream filtered; | |
46bf0438 JH |
61 | } u; |
62 | }; | |
63 | ||
7ef2d9a2 JH |
64 | /***************************************************************** |
65 | * | |
66 | * Common helpers | |
67 | * | |
68 | *****************************************************************/ | |
69 | ||
70 | static void close_deflated_stream(struct git_istream *st) | |
71 | { | |
72 | if (st->z_state == z_used) | |
73 | git_inflate_end(&st->z); | |
74 | } | |
75 | ||
76 | ||
b6691092 JH |
77 | /***************************************************************** |
78 | * | |
79 | * Filtered stream | |
80 | * | |
81 | *****************************************************************/ | |
82 | ||
bc062ad0 | 83 | static int close_istream_filtered(struct git_istream *st) |
b6691092 JH |
84 | { |
85 | free_stream_filter(st->u.filtered.filter); | |
86 | return close_istream(st->u.filtered.upstream); | |
87 | } | |
88 | ||
bc062ad0 ÆAB |
89 | static ssize_t read_istream_filtered(struct git_istream *st, char *buf, |
90 | size_t sz) | |
b6691092 JH |
91 | { |
92 | struct filtered_istream *fs = &(st->u.filtered); | |
93 | size_t filled = 0; | |
94 | ||
95 | while (sz) { | |
96 | /* do we already have filtered output? */ | |
97 | if (fs->o_ptr < fs->o_end) { | |
98 | size_t to_move = fs->o_end - fs->o_ptr; | |
99 | if (sz < to_move) | |
100 | to_move = sz; | |
101 | memcpy(buf + filled, fs->obuf + fs->o_ptr, to_move); | |
102 | fs->o_ptr += to_move; | |
103 | sz -= to_move; | |
104 | filled += to_move; | |
105 | continue; | |
106 | } | |
107 | fs->o_end = fs->o_ptr = 0; | |
108 | ||
109 | /* do we have anything to feed the filter with? */ | |
110 | if (fs->i_ptr < fs->i_end) { | |
111 | size_t to_feed = fs->i_end - fs->i_ptr; | |
112 | size_t to_receive = FILTER_BUFFER; | |
113 | if (stream_filter(fs->filter, | |
114 | fs->ibuf + fs->i_ptr, &to_feed, | |
115 | fs->obuf, &to_receive)) | |
116 | return -1; | |
117 | fs->i_ptr = fs->i_end - to_feed; | |
118 | fs->o_end = FILTER_BUFFER - to_receive; | |
119 | continue; | |
120 | } | |
4ae66704 JH |
121 | |
122 | /* tell the filter to drain upon no more input */ | |
123 | if (fs->input_finished) { | |
124 | size_t to_receive = FILTER_BUFFER; | |
125 | if (stream_filter(fs->filter, | |
126 | NULL, NULL, | |
127 | fs->obuf, &to_receive)) | |
128 | return -1; | |
129 | fs->o_end = FILTER_BUFFER - to_receive; | |
130 | if (!fs->o_end) | |
131 | break; | |
132 | continue; | |
133 | } | |
b6691092 JH |
134 | fs->i_end = fs->i_ptr = 0; |
135 | ||
136 | /* refill the input from the upstream */ | |
4ae66704 JH |
137 | if (!fs->input_finished) { |
138 | fs->i_end = read_istream(fs->upstream, fs->ibuf, FILTER_BUFFER); | |
139 | if (fs->i_end < 0) | |
42e7e2a5 | 140 | return -1; |
4ae66704 JH |
141 | if (fs->i_end) |
142 | continue; | |
143 | } | |
144 | fs->input_finished = 1; | |
b6691092 JH |
145 | } |
146 | return filled; | |
147 | } | |
148 | ||
b6691092 JH |
149 | static struct git_istream *attach_stream_filter(struct git_istream *st, |
150 | struct stream_filter *filter) | |
151 | { | |
152 | struct git_istream *ifs = xmalloc(sizeof(*ifs)); | |
153 | struct filtered_istream *fs = &(ifs->u.filtered); | |
154 | ||
d4e2d15a ÆAB |
155 | ifs->close = close_istream_filtered; |
156 | ifs->read = read_istream_filtered; | |
b6691092 JH |
157 | fs->upstream = st; |
158 | fs->filter = filter; | |
159 | fs->i_end = fs->i_ptr = 0; | |
160 | fs->o_end = fs->o_ptr = 0; | |
4ae66704 | 161 | fs->input_finished = 0; |
b6691092 JH |
162 | ifs->size = -1; /* unknown */ |
163 | return ifs; | |
164 | } | |
165 | ||
46bf0438 JH |
166 | /***************************************************************** |
167 | * | |
168 | * Loose object stream | |
169 | * | |
170 | *****************************************************************/ | |
171 | ||
bc062ad0 | 172 | static ssize_t read_istream_loose(struct git_istream *st, char *buf, size_t sz) |
93aa7bd5 JH |
173 | { |
174 | size_t total_read = 0; | |
175 | ||
176 | switch (st->z_state) { | |
177 | case z_done: | |
178 | return 0; | |
179 | case z_error: | |
180 | return -1; | |
181 | default: | |
182 | break; | |
183 | } | |
184 | ||
185 | if (st->u.loose.hdr_used < st->u.loose.hdr_avail) { | |
186 | size_t to_copy = st->u.loose.hdr_avail - st->u.loose.hdr_used; | |
187 | if (sz < to_copy) | |
188 | to_copy = sz; | |
189 | memcpy(buf, st->u.loose.hdr + st->u.loose.hdr_used, to_copy); | |
190 | st->u.loose.hdr_used += to_copy; | |
191 | total_read += to_copy; | |
192 | } | |
193 | ||
194 | while (total_read < sz) { | |
195 | int status; | |
196 | ||
197 | st->z.next_out = (unsigned char *)buf + total_read; | |
198 | st->z.avail_out = sz - total_read; | |
199 | status = git_inflate(&st->z, Z_FINISH); | |
200 | ||
201 | total_read = st->z.next_out - (unsigned char *)buf; | |
202 | ||
203 | if (status == Z_STREAM_END) { | |
204 | git_inflate_end(&st->z); | |
205 | st->z_state = z_done; | |
206 | break; | |
207 | } | |
692f0bc7 | 208 | if (status != Z_OK && (status != Z_BUF_ERROR || total_read < sz)) { |
93aa7bd5 JH |
209 | git_inflate_end(&st->z); |
210 | st->z_state = z_error; | |
211 | return -1; | |
212 | } | |
213 | } | |
214 | return total_read; | |
215 | } | |
216 | ||
bc062ad0 | 217 | static int close_istream_loose(struct git_istream *st) |
93aa7bd5 JH |
218 | { |
219 | close_deflated_stream(st); | |
220 | munmap(st->u.loose.mapped, st->u.loose.mapsize); | |
221 | return 0; | |
222 | } | |
223 | ||
bc062ad0 | 224 | static int open_istream_loose(struct git_istream *st, struct repository *r, |
bc062ad0 ÆAB |
225 | const struct object_id *oid, |
226 | enum object_type *type) | |
46bf0438 | 227 | { |
ddb3474b ÆAB |
228 | struct object_info oi = OBJECT_INFO_INIT; |
229 | oi.sizep = &st->size; | |
dccb32bf | 230 | oi.typep = type; |
ddb3474b | 231 | |
c8123e72 | 232 | st->u.loose.mapped = map_loose_object(r, oid, &st->u.loose.mapsize); |
93aa7bd5 JH |
233 | if (!st->u.loose.mapped) |
234 | return -1; | |
3b6a8db3 ÆAB |
235 | switch (unpack_loose_header(&st->z, st->u.loose.mapped, |
236 | st->u.loose.mapsize, st->u.loose.hdr, | |
237 | sizeof(st->u.loose.hdr), NULL)) { | |
238 | case ULHR_OK: | |
239 | break; | |
240 | case ULHR_BAD: | |
5848fb11 | 241 | case ULHR_TOO_LONG: |
3b6a8db3 | 242 | goto error; |
93aa7bd5 | 243 | } |
dccb32bf | 244 | if (parse_loose_header(st->u.loose.hdr, &oi) < 0 || *type < 0) |
3b6a8db3 | 245 | goto error; |
93aa7bd5 | 246 | |
93aa7bd5 JH |
247 | st->u.loose.hdr_used = strlen(st->u.loose.hdr) + 1; |
248 | st->u.loose.hdr_avail = st->z.total_out; | |
249 | st->z_state = z_used; | |
d4e2d15a ÆAB |
250 | st->close = close_istream_loose; |
251 | st->read = read_istream_loose; | |
93aa7bd5 | 252 | |
93aa7bd5 | 253 | return 0; |
3b6a8db3 ÆAB |
254 | error: |
255 | git_inflate_end(&st->z); | |
256 | munmap(st->u.loose.mapped, st->u.loose.mapsize); | |
257 | return -1; | |
46bf0438 JH |
258 | } |
259 | ||
260 | ||
261 | /***************************************************************** | |
262 | * | |
263 | * Non-delta packed object stream | |
264 | * | |
265 | *****************************************************************/ | |
266 | ||
bc062ad0 ÆAB |
267 | static ssize_t read_istream_pack_non_delta(struct git_istream *st, char *buf, |
268 | size_t sz) | |
7ef2d9a2 JH |
269 | { |
270 | size_t total_read = 0; | |
271 | ||
272 | switch (st->z_state) { | |
273 | case z_unused: | |
274 | memset(&st->z, 0, sizeof(st->z)); | |
275 | git_inflate_init(&st->z); | |
276 | st->z_state = z_used; | |
277 | break; | |
278 | case z_done: | |
279 | return 0; | |
280 | case z_error: | |
281 | return -1; | |
282 | case z_used: | |
283 | break; | |
284 | } | |
285 | ||
286 | while (total_read < sz) { | |
287 | int status; | |
288 | struct pack_window *window = NULL; | |
289 | unsigned char *mapped; | |
290 | ||
291 | mapped = use_pack(st->u.in_pack.pack, &window, | |
292 | st->u.in_pack.pos, &st->z.avail_in); | |
293 | ||
294 | st->z.next_out = (unsigned char *)buf + total_read; | |
295 | st->z.avail_out = sz - total_read; | |
296 | st->z.next_in = mapped; | |
297 | status = git_inflate(&st->z, Z_FINISH); | |
298 | ||
299 | st->u.in_pack.pos += st->z.next_in - mapped; | |
300 | total_read = st->z.next_out - (unsigned char *)buf; | |
301 | unuse_pack(&window); | |
302 | ||
303 | if (status == Z_STREAM_END) { | |
304 | git_inflate_end(&st->z); | |
305 | st->z_state = z_done; | |
306 | break; | |
307 | } | |
0afbe3e8 JK |
308 | |
309 | /* | |
310 | * Unlike the loose object case, we do not have to worry here | |
311 | * about running out of input bytes and spinning infinitely. If | |
312 | * we get Z_BUF_ERROR due to too few input bytes, then we'll | |
313 | * replenish them in the next use_pack() call when we loop. If | |
314 | * we truly hit the end of the pack (i.e., because it's corrupt | |
315 | * or truncated), then use_pack() catches that and will die(). | |
316 | */ | |
7ef2d9a2 JH |
317 | if (status != Z_OK && status != Z_BUF_ERROR) { |
318 | git_inflate_end(&st->z); | |
319 | st->z_state = z_error; | |
320 | return -1; | |
321 | } | |
322 | } | |
323 | return total_read; | |
324 | } | |
325 | ||
bc062ad0 | 326 | static int close_istream_pack_non_delta(struct git_istream *st) |
7ef2d9a2 JH |
327 | { |
328 | close_deflated_stream(st); | |
329 | return 0; | |
330 | } | |
331 | ||
bc062ad0 | 332 | static int open_istream_pack_non_delta(struct git_istream *st, |
5cf88fd8 ÆAB |
333 | struct repository *r UNUSED, |
334 | const struct object_id *oid UNUSED, | |
335 | enum object_type *type UNUSED) | |
46bf0438 | 336 | { |
7ef2d9a2 JH |
337 | struct pack_window *window; |
338 | enum object_type in_pack_type; | |
339 | ||
7ef2d9a2 JH |
340 | window = NULL; |
341 | ||
342 | in_pack_type = unpack_object_header(st->u.in_pack.pack, | |
343 | &window, | |
344 | &st->u.in_pack.pos, | |
345 | &st->size); | |
346 | unuse_pack(&window); | |
347 | switch (in_pack_type) { | |
348 | default: | |
349 | return -1; /* we do not do deltas for now */ | |
350 | case OBJ_COMMIT: | |
351 | case OBJ_TREE: | |
352 | case OBJ_BLOB: | |
353 | case OBJ_TAG: | |
354 | break; | |
355 | } | |
356 | st->z_state = z_unused; | |
d4e2d15a ÆAB |
357 | st->close = close_istream_pack_non_delta; |
358 | st->read = read_istream_pack_non_delta; | |
359 | ||
7ef2d9a2 | 360 | return 0; |
46bf0438 JH |
361 | } |
362 | ||
363 | ||
364 | /***************************************************************** | |
365 | * | |
366 | * In-core stream | |
367 | * | |
368 | *****************************************************************/ | |
369 | ||
bc062ad0 | 370 | static int close_istream_incore(struct git_istream *st) |
46bf0438 JH |
371 | { |
372 | free(st->u.incore.buf); | |
373 | return 0; | |
374 | } | |
375 | ||
bc062ad0 | 376 | static ssize_t read_istream_incore(struct git_istream *st, char *buf, size_t sz) |
46bf0438 JH |
377 | { |
378 | size_t read_size = sz; | |
379 | size_t remainder = st->size - st->u.incore.read_ptr; | |
380 | ||
381 | if (remainder <= read_size) | |
382 | read_size = remainder; | |
383 | if (read_size) { | |
384 | memcpy(buf, st->u.incore.buf + st->u.incore.read_ptr, read_size); | |
385 | st->u.incore.read_ptr += read_size; | |
386 | } | |
387 | return read_size; | |
388 | } | |
389 | ||
bc062ad0 | 390 | static int open_istream_incore(struct git_istream *st, struct repository *r, |
de94c0ea | 391 | const struct object_id *oid, enum object_type *type) |
46bf0438 | 392 | { |
34728d7f JK |
393 | struct object_info oi = OBJECT_INFO_INIT; |
394 | ||
46bf0438 | 395 | st->u.incore.read_ptr = 0; |
d4e2d15a ÆAB |
396 | st->close = close_istream_incore; |
397 | st->read = read_istream_incore; | |
46bf0438 | 398 | |
34728d7f JK |
399 | oi.typep = type; |
400 | oi.sizep = &st->size; | |
401 | oi.contentp = (void **)&st->u.incore.buf; | |
402 | return oid_object_info_extended(r, oid, &oi, | |
403 | OBJECT_INFO_DIE_IF_CORRUPT); | |
46bf0438 | 404 | } |
47a02ff2 | 405 | |
b6552836 ÆAB |
406 | /***************************************************************************** |
407 | * static helpers variables and functions for users of streaming interface | |
408 | *****************************************************************************/ | |
409 | ||
d4e2d15a ÆAB |
410 | static int istream_source(struct git_istream *st, |
411 | struct repository *r, | |
412 | const struct object_id *oid, | |
413 | enum object_type *type) | |
b6552836 ÆAB |
414 | { |
415 | unsigned long size; | |
416 | int status; | |
de94c0ea | 417 | struct object_info oi = OBJECT_INFO_INIT; |
b6552836 | 418 | |
de94c0ea ÆAB |
419 | oi.typep = type; |
420 | oi.sizep = &size; | |
421 | status = oid_object_info_extended(r, oid, &oi, 0); | |
b6552836 | 422 | if (status < 0) |
d4e2d15a | 423 | return status; |
b6552836 | 424 | |
de94c0ea | 425 | switch (oi.whence) { |
b6552836 | 426 | case OI_LOOSE: |
d4e2d15a ÆAB |
427 | st->open = open_istream_loose; |
428 | return 0; | |
b6552836 | 429 | case OI_PACKED: |
de94c0ea ÆAB |
430 | if (!oi.u.packed.is_delta && big_file_threshold < size) { |
431 | st->u.in_pack.pack = oi.u.packed.pack; | |
432 | st->u.in_pack.pos = oi.u.packed.offset; | |
d4e2d15a ÆAB |
433 | st->open = open_istream_pack_non_delta; |
434 | return 0; | |
de94c0ea | 435 | } |
b6552836 ÆAB |
436 | /* fallthru */ |
437 | default: | |
d4e2d15a ÆAB |
438 | st->open = open_istream_incore; |
439 | return 0; | |
b6552836 ÆAB |
440 | } |
441 | } | |
442 | ||
47a02ff2 JH |
443 | /**************************************************************** |
444 | * Users of streaming interface | |
445 | ****************************************************************/ | |
446 | ||
b6552836 ÆAB |
447 | int close_istream(struct git_istream *st) |
448 | { | |
d4e2d15a | 449 | int r = st->close(st); |
b6552836 ÆAB |
450 | free(st); |
451 | return r; | |
452 | } | |
453 | ||
454 | ssize_t read_istream(struct git_istream *st, void *buf, size_t sz) | |
455 | { | |
d4e2d15a | 456 | return st->read(st, buf, sz); |
b6552836 ÆAB |
457 | } |
458 | ||
459 | struct git_istream *open_istream(struct repository *r, | |
460 | const struct object_id *oid, | |
461 | enum object_type *type, | |
462 | unsigned long *size, | |
463 | struct stream_filter *filter) | |
464 | { | |
de94c0ea | 465 | struct git_istream *st = xmalloc(sizeof(*st)); |
b6552836 | 466 | const struct object_id *real = lookup_replace_object(r, oid); |
d4e2d15a | 467 | int ret = istream_source(st, r, real, type); |
b6552836 | 468 | |
d4e2d15a | 469 | if (ret) { |
de94c0ea | 470 | free(st); |
b6552836 | 471 | return NULL; |
de94c0ea | 472 | } |
b6552836 | 473 | |
d4e2d15a | 474 | if (st->open(st, r, real, type)) { |
de94c0ea | 475 | if (open_istream_incore(st, r, real, type)) { |
b6552836 ÆAB |
476 | free(st); |
477 | return NULL; | |
478 | } | |
479 | } | |
480 | if (filter) { | |
481 | /* Add "&& !is_null_stream_filter(filter)" for performance */ | |
482 | struct git_istream *nst = attach_stream_filter(st, filter); | |
483 | if (!nst) { | |
484 | close_istream(st); | |
485 | return NULL; | |
486 | } | |
487 | st = nst; | |
488 | } | |
489 | ||
490 | *size = st->size; | |
491 | return st; | |
492 | } | |
493 | ||
7eda0e4f | 494 | int stream_blob_to_fd(int fd, const struct object_id *oid, struct stream_filter *filter, |
47a02ff2 JH |
495 | int can_seek) |
496 | { | |
497 | struct git_istream *st; | |
498 | enum object_type type; | |
499 | unsigned long sz; | |
500 | ssize_t kept = 0; | |
501 | int result = -1; | |
502 | ||
c8123e72 | 503 | st = open_istream(the_repository, oid, &type, &sz, filter); |
9ce4ad3e JK |
504 | if (!st) { |
505 | if (filter) | |
506 | free_stream_filter(filter); | |
47a02ff2 | 507 | return result; |
9ce4ad3e | 508 | } |
47a02ff2 JH |
509 | if (type != OBJ_BLOB) |
510 | goto close_and_exit; | |
511 | for (;;) { | |
512 | char buf[1024 * 16]; | |
513 | ssize_t wrote, holeto; | |
514 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
515 | ||
45d4bdae JK |
516 | if (readlen < 0) |
517 | goto close_and_exit; | |
47a02ff2 JH |
518 | if (!readlen) |
519 | break; | |
520 | if (can_seek && sizeof(buf) == readlen) { | |
521 | for (holeto = 0; holeto < readlen; holeto++) | |
522 | if (buf[holeto]) | |
523 | break; | |
524 | if (readlen == holeto) { | |
525 | kept += holeto; | |
526 | continue; | |
527 | } | |
528 | } | |
529 | ||
530 | if (kept && lseek(fd, kept, SEEK_CUR) == (off_t) -1) | |
531 | goto close_and_exit; | |
532 | else | |
533 | kept = 0; | |
534 | wrote = write_in_full(fd, buf, readlen); | |
535 | ||
564bde9a | 536 | if (wrote < 0) |
47a02ff2 JH |
537 | goto close_and_exit; |
538 | } | |
539 | if (kept && (lseek(fd, kept - 1, SEEK_CUR) == (off_t) -1 || | |
7edc02f4 | 540 | xwrite(fd, "", 1) != 1)) |
47a02ff2 JH |
541 | goto close_and_exit; |
542 | result = 0; | |
543 | ||
544 | close_and_exit: | |
545 | close_istream(st); | |
546 | return result; | |
547 | } |