]>
Commit | Line | Data |
---|---|---|
46bf0438 JH |
1 | /* |
2 | * Copyright (c) 2011, Google Inc. | |
3 | */ | |
b6fdc44c | 4 | #include "git-compat-util.h" |
73359a9b | 5 | #include "convert.h" |
32a8f510 | 6 | #include "environment.h" |
46bf0438 | 7 | #include "streaming.h" |
e35454fa | 8 | #include "repository.h" |
87bed179 | 9 | #include "object-file.h" |
a034e910 | 10 | #include "object-store-ll.h" |
47f351e9 | 11 | #include "replace-object.h" |
84f80ad5 | 12 | #include "packfile.h" |
46bf0438 | 13 | |
46bf0438 | 14 | typedef int (*open_istream_fn)(struct git_istream *, |
c8123e72 | 15 | struct repository *, |
575042a0 | 16 | const struct object_id *, |
46bf0438 JH |
17 | enum object_type *); |
18 | typedef int (*close_istream_fn)(struct git_istream *); | |
19 | typedef ssize_t (*read_istream_fn)(struct git_istream *, char *, size_t); | |
20 | ||
b6691092 JH |
21 | #define FILTER_BUFFER (1024*16) |
22 | ||
23 | struct filtered_istream { | |
24 | struct git_istream *upstream; | |
25 | struct stream_filter *filter; | |
26 | char ibuf[FILTER_BUFFER]; | |
27 | char obuf[FILTER_BUFFER]; | |
28 | int i_end, i_ptr; | |
29 | int o_end, o_ptr; | |
4ae66704 | 30 | int input_finished; |
b6691092 JH |
31 | }; |
32 | ||
46bf0438 | 33 | struct git_istream { |
d4e2d15a ÆAB |
34 | open_istream_fn open; |
35 | close_istream_fn close; | |
36 | read_istream_fn read; | |
37 | ||
46bf0438 | 38 | unsigned long size; /* inflated size of full object */ |
eb4f4076 | 39 | git_zstream z; |
7ef2d9a2 | 40 | enum { z_unused, z_used, z_done, z_error } z_state; |
46bf0438 JH |
41 | |
42 | union { | |
43 | struct { | |
34728d7f | 44 | char *buf; /* from oid_object_info_extended() */ |
46bf0438 JH |
45 | unsigned long read_ptr; |
46 | } incore; | |
47 | ||
48 | struct { | |
93aa7bd5 JH |
49 | void *mapped; |
50 | unsigned long mapsize; | |
51 | char hdr[32]; | |
52 | int hdr_avail; | |
53 | int hdr_used; | |
46bf0438 JH |
54 | } loose; |
55 | ||
56 | struct { | |
7ef2d9a2 JH |
57 | struct packed_git *pack; |
58 | off_t pos; | |
46bf0438 | 59 | } in_pack; |
b6691092 JH |
60 | |
61 | struct filtered_istream filtered; | |
46bf0438 JH |
62 | } u; |
63 | }; | |
64 | ||
7ef2d9a2 JH |
65 | /***************************************************************** |
66 | * | |
67 | * Common helpers | |
68 | * | |
69 | *****************************************************************/ | |
70 | ||
71 | static void close_deflated_stream(struct git_istream *st) | |
72 | { | |
73 | if (st->z_state == z_used) | |
74 | git_inflate_end(&st->z); | |
75 | } | |
76 | ||
77 | ||
b6691092 JH |
78 | /***************************************************************** |
79 | * | |
80 | * Filtered stream | |
81 | * | |
82 | *****************************************************************/ | |
83 | ||
bc062ad0 | 84 | static int close_istream_filtered(struct git_istream *st) |
b6691092 JH |
85 | { |
86 | free_stream_filter(st->u.filtered.filter); | |
87 | return close_istream(st->u.filtered.upstream); | |
88 | } | |
89 | ||
bc062ad0 ÆAB |
90 | static ssize_t read_istream_filtered(struct git_istream *st, char *buf, |
91 | size_t sz) | |
b6691092 JH |
92 | { |
93 | struct filtered_istream *fs = &(st->u.filtered); | |
94 | size_t filled = 0; | |
95 | ||
96 | while (sz) { | |
97 | /* do we already have filtered output? */ | |
98 | if (fs->o_ptr < fs->o_end) { | |
99 | size_t to_move = fs->o_end - fs->o_ptr; | |
100 | if (sz < to_move) | |
101 | to_move = sz; | |
102 | memcpy(buf + filled, fs->obuf + fs->o_ptr, to_move); | |
103 | fs->o_ptr += to_move; | |
104 | sz -= to_move; | |
105 | filled += to_move; | |
106 | continue; | |
107 | } | |
108 | fs->o_end = fs->o_ptr = 0; | |
109 | ||
110 | /* do we have anything to feed the filter with? */ | |
111 | if (fs->i_ptr < fs->i_end) { | |
112 | size_t to_feed = fs->i_end - fs->i_ptr; | |
113 | size_t to_receive = FILTER_BUFFER; | |
114 | if (stream_filter(fs->filter, | |
115 | fs->ibuf + fs->i_ptr, &to_feed, | |
116 | fs->obuf, &to_receive)) | |
117 | return -1; | |
118 | fs->i_ptr = fs->i_end - to_feed; | |
119 | fs->o_end = FILTER_BUFFER - to_receive; | |
120 | continue; | |
121 | } | |
4ae66704 JH |
122 | |
123 | /* tell the filter to drain upon no more input */ | |
124 | if (fs->input_finished) { | |
125 | size_t to_receive = FILTER_BUFFER; | |
126 | if (stream_filter(fs->filter, | |
127 | NULL, NULL, | |
128 | fs->obuf, &to_receive)) | |
129 | return -1; | |
130 | fs->o_end = FILTER_BUFFER - to_receive; | |
131 | if (!fs->o_end) | |
132 | break; | |
133 | continue; | |
134 | } | |
b6691092 JH |
135 | fs->i_end = fs->i_ptr = 0; |
136 | ||
137 | /* refill the input from the upstream */ | |
4ae66704 JH |
138 | if (!fs->input_finished) { |
139 | fs->i_end = read_istream(fs->upstream, fs->ibuf, FILTER_BUFFER); | |
140 | if (fs->i_end < 0) | |
42e7e2a5 | 141 | return -1; |
4ae66704 JH |
142 | if (fs->i_end) |
143 | continue; | |
144 | } | |
145 | fs->input_finished = 1; | |
b6691092 JH |
146 | } |
147 | return filled; | |
148 | } | |
149 | ||
b6691092 JH |
150 | static struct git_istream *attach_stream_filter(struct git_istream *st, |
151 | struct stream_filter *filter) | |
152 | { | |
153 | struct git_istream *ifs = xmalloc(sizeof(*ifs)); | |
154 | struct filtered_istream *fs = &(ifs->u.filtered); | |
155 | ||
d4e2d15a ÆAB |
156 | ifs->close = close_istream_filtered; |
157 | ifs->read = read_istream_filtered; | |
b6691092 JH |
158 | fs->upstream = st; |
159 | fs->filter = filter; | |
160 | fs->i_end = fs->i_ptr = 0; | |
161 | fs->o_end = fs->o_ptr = 0; | |
4ae66704 | 162 | fs->input_finished = 0; |
b6691092 JH |
163 | ifs->size = -1; /* unknown */ |
164 | return ifs; | |
165 | } | |
166 | ||
46bf0438 JH |
167 | /***************************************************************** |
168 | * | |
169 | * Loose object stream | |
170 | * | |
171 | *****************************************************************/ | |
172 | ||
bc062ad0 | 173 | static ssize_t read_istream_loose(struct git_istream *st, char *buf, size_t sz) |
93aa7bd5 JH |
174 | { |
175 | size_t total_read = 0; | |
176 | ||
177 | switch (st->z_state) { | |
178 | case z_done: | |
179 | return 0; | |
180 | case z_error: | |
181 | return -1; | |
182 | default: | |
183 | break; | |
184 | } | |
185 | ||
186 | if (st->u.loose.hdr_used < st->u.loose.hdr_avail) { | |
187 | size_t to_copy = st->u.loose.hdr_avail - st->u.loose.hdr_used; | |
188 | if (sz < to_copy) | |
189 | to_copy = sz; | |
190 | memcpy(buf, st->u.loose.hdr + st->u.loose.hdr_used, to_copy); | |
191 | st->u.loose.hdr_used += to_copy; | |
192 | total_read += to_copy; | |
193 | } | |
194 | ||
195 | while (total_read < sz) { | |
196 | int status; | |
197 | ||
198 | st->z.next_out = (unsigned char *)buf + total_read; | |
199 | st->z.avail_out = sz - total_read; | |
200 | status = git_inflate(&st->z, Z_FINISH); | |
201 | ||
202 | total_read = st->z.next_out - (unsigned char *)buf; | |
203 | ||
204 | if (status == Z_STREAM_END) { | |
205 | git_inflate_end(&st->z); | |
206 | st->z_state = z_done; | |
207 | break; | |
208 | } | |
692f0bc7 | 209 | if (status != Z_OK && (status != Z_BUF_ERROR || total_read < sz)) { |
93aa7bd5 JH |
210 | git_inflate_end(&st->z); |
211 | st->z_state = z_error; | |
212 | return -1; | |
213 | } | |
214 | } | |
215 | return total_read; | |
216 | } | |
217 | ||
bc062ad0 | 218 | static int close_istream_loose(struct git_istream *st) |
93aa7bd5 JH |
219 | { |
220 | close_deflated_stream(st); | |
221 | munmap(st->u.loose.mapped, st->u.loose.mapsize); | |
222 | return 0; | |
223 | } | |
224 | ||
bc062ad0 | 225 | static int open_istream_loose(struct git_istream *st, struct repository *r, |
bc062ad0 ÆAB |
226 | const struct object_id *oid, |
227 | enum object_type *type) | |
46bf0438 | 228 | { |
ddb3474b ÆAB |
229 | struct object_info oi = OBJECT_INFO_INIT; |
230 | oi.sizep = &st->size; | |
dccb32bf | 231 | oi.typep = type; |
ddb3474b | 232 | |
c8123e72 | 233 | st->u.loose.mapped = map_loose_object(r, oid, &st->u.loose.mapsize); |
93aa7bd5 JH |
234 | if (!st->u.loose.mapped) |
235 | return -1; | |
3b6a8db3 ÆAB |
236 | switch (unpack_loose_header(&st->z, st->u.loose.mapped, |
237 | st->u.loose.mapsize, st->u.loose.hdr, | |
238 | sizeof(st->u.loose.hdr), NULL)) { | |
239 | case ULHR_OK: | |
240 | break; | |
241 | case ULHR_BAD: | |
5848fb11 | 242 | case ULHR_TOO_LONG: |
3b6a8db3 | 243 | goto error; |
93aa7bd5 | 244 | } |
dccb32bf | 245 | if (parse_loose_header(st->u.loose.hdr, &oi) < 0 || *type < 0) |
3b6a8db3 | 246 | goto error; |
93aa7bd5 | 247 | |
93aa7bd5 JH |
248 | st->u.loose.hdr_used = strlen(st->u.loose.hdr) + 1; |
249 | st->u.loose.hdr_avail = st->z.total_out; | |
250 | st->z_state = z_used; | |
d4e2d15a ÆAB |
251 | st->close = close_istream_loose; |
252 | st->read = read_istream_loose; | |
93aa7bd5 | 253 | |
93aa7bd5 | 254 | return 0; |
3b6a8db3 ÆAB |
255 | error: |
256 | git_inflate_end(&st->z); | |
257 | munmap(st->u.loose.mapped, st->u.loose.mapsize); | |
258 | return -1; | |
46bf0438 JH |
259 | } |
260 | ||
261 | ||
262 | /***************************************************************** | |
263 | * | |
264 | * Non-delta packed object stream | |
265 | * | |
266 | *****************************************************************/ | |
267 | ||
bc062ad0 ÆAB |
268 | static ssize_t read_istream_pack_non_delta(struct git_istream *st, char *buf, |
269 | size_t sz) | |
7ef2d9a2 JH |
270 | { |
271 | size_t total_read = 0; | |
272 | ||
273 | switch (st->z_state) { | |
274 | case z_unused: | |
275 | memset(&st->z, 0, sizeof(st->z)); | |
276 | git_inflate_init(&st->z); | |
277 | st->z_state = z_used; | |
278 | break; | |
279 | case z_done: | |
280 | return 0; | |
281 | case z_error: | |
282 | return -1; | |
283 | case z_used: | |
284 | break; | |
285 | } | |
286 | ||
287 | while (total_read < sz) { | |
288 | int status; | |
289 | struct pack_window *window = NULL; | |
290 | unsigned char *mapped; | |
291 | ||
292 | mapped = use_pack(st->u.in_pack.pack, &window, | |
293 | st->u.in_pack.pos, &st->z.avail_in); | |
294 | ||
295 | st->z.next_out = (unsigned char *)buf + total_read; | |
296 | st->z.avail_out = sz - total_read; | |
297 | st->z.next_in = mapped; | |
298 | status = git_inflate(&st->z, Z_FINISH); | |
299 | ||
300 | st->u.in_pack.pos += st->z.next_in - mapped; | |
301 | total_read = st->z.next_out - (unsigned char *)buf; | |
302 | unuse_pack(&window); | |
303 | ||
304 | if (status == Z_STREAM_END) { | |
305 | git_inflate_end(&st->z); | |
306 | st->z_state = z_done; | |
307 | break; | |
308 | } | |
0afbe3e8 JK |
309 | |
310 | /* | |
311 | * Unlike the loose object case, we do not have to worry here | |
312 | * about running out of input bytes and spinning infinitely. If | |
313 | * we get Z_BUF_ERROR due to too few input bytes, then we'll | |
314 | * replenish them in the next use_pack() call when we loop. If | |
315 | * we truly hit the end of the pack (i.e., because it's corrupt | |
316 | * or truncated), then use_pack() catches that and will die(). | |
317 | */ | |
7ef2d9a2 JH |
318 | if (status != Z_OK && status != Z_BUF_ERROR) { |
319 | git_inflate_end(&st->z); | |
320 | st->z_state = z_error; | |
321 | return -1; | |
322 | } | |
323 | } | |
324 | return total_read; | |
325 | } | |
326 | ||
bc062ad0 | 327 | static int close_istream_pack_non_delta(struct git_istream *st) |
7ef2d9a2 JH |
328 | { |
329 | close_deflated_stream(st); | |
330 | return 0; | |
331 | } | |
332 | ||
bc062ad0 | 333 | static int open_istream_pack_non_delta(struct git_istream *st, |
5cf88fd8 ÆAB |
334 | struct repository *r UNUSED, |
335 | const struct object_id *oid UNUSED, | |
336 | enum object_type *type UNUSED) | |
46bf0438 | 337 | { |
7ef2d9a2 JH |
338 | struct pack_window *window; |
339 | enum object_type in_pack_type; | |
340 | ||
7ef2d9a2 JH |
341 | window = NULL; |
342 | ||
343 | in_pack_type = unpack_object_header(st->u.in_pack.pack, | |
344 | &window, | |
345 | &st->u.in_pack.pos, | |
346 | &st->size); | |
347 | unuse_pack(&window); | |
348 | switch (in_pack_type) { | |
349 | default: | |
350 | return -1; /* we do not do deltas for now */ | |
351 | case OBJ_COMMIT: | |
352 | case OBJ_TREE: | |
353 | case OBJ_BLOB: | |
354 | case OBJ_TAG: | |
355 | break; | |
356 | } | |
357 | st->z_state = z_unused; | |
d4e2d15a ÆAB |
358 | st->close = close_istream_pack_non_delta; |
359 | st->read = read_istream_pack_non_delta; | |
360 | ||
7ef2d9a2 | 361 | return 0; |
46bf0438 JH |
362 | } |
363 | ||
364 | ||
365 | /***************************************************************** | |
366 | * | |
367 | * In-core stream | |
368 | * | |
369 | *****************************************************************/ | |
370 | ||
bc062ad0 | 371 | static int close_istream_incore(struct git_istream *st) |
46bf0438 JH |
372 | { |
373 | free(st->u.incore.buf); | |
374 | return 0; | |
375 | } | |
376 | ||
bc062ad0 | 377 | static ssize_t read_istream_incore(struct git_istream *st, char *buf, size_t sz) |
46bf0438 JH |
378 | { |
379 | size_t read_size = sz; | |
380 | size_t remainder = st->size - st->u.incore.read_ptr; | |
381 | ||
382 | if (remainder <= read_size) | |
383 | read_size = remainder; | |
384 | if (read_size) { | |
385 | memcpy(buf, st->u.incore.buf + st->u.incore.read_ptr, read_size); | |
386 | st->u.incore.read_ptr += read_size; | |
387 | } | |
388 | return read_size; | |
389 | } | |
390 | ||
bc062ad0 | 391 | static int open_istream_incore(struct git_istream *st, struct repository *r, |
de94c0ea | 392 | const struct object_id *oid, enum object_type *type) |
46bf0438 | 393 | { |
34728d7f JK |
394 | struct object_info oi = OBJECT_INFO_INIT; |
395 | ||
46bf0438 | 396 | st->u.incore.read_ptr = 0; |
d4e2d15a ÆAB |
397 | st->close = close_istream_incore; |
398 | st->read = read_istream_incore; | |
46bf0438 | 399 | |
34728d7f JK |
400 | oi.typep = type; |
401 | oi.sizep = &st->size; | |
402 | oi.contentp = (void **)&st->u.incore.buf; | |
403 | return oid_object_info_extended(r, oid, &oi, | |
404 | OBJECT_INFO_DIE_IF_CORRUPT); | |
46bf0438 | 405 | } |
47a02ff2 | 406 | |
b6552836 ÆAB |
407 | /***************************************************************************** |
408 | * static helpers variables and functions for users of streaming interface | |
409 | *****************************************************************************/ | |
410 | ||
d4e2d15a ÆAB |
411 | static int istream_source(struct git_istream *st, |
412 | struct repository *r, | |
413 | const struct object_id *oid, | |
414 | enum object_type *type) | |
b6552836 ÆAB |
415 | { |
416 | unsigned long size; | |
417 | int status; | |
de94c0ea | 418 | struct object_info oi = OBJECT_INFO_INIT; |
b6552836 | 419 | |
de94c0ea ÆAB |
420 | oi.typep = type; |
421 | oi.sizep = &size; | |
422 | status = oid_object_info_extended(r, oid, &oi, 0); | |
b6552836 | 423 | if (status < 0) |
d4e2d15a | 424 | return status; |
b6552836 | 425 | |
de94c0ea | 426 | switch (oi.whence) { |
b6552836 | 427 | case OI_LOOSE: |
d4e2d15a ÆAB |
428 | st->open = open_istream_loose; |
429 | return 0; | |
b6552836 | 430 | case OI_PACKED: |
de94c0ea ÆAB |
431 | if (!oi.u.packed.is_delta && big_file_threshold < size) { |
432 | st->u.in_pack.pack = oi.u.packed.pack; | |
433 | st->u.in_pack.pos = oi.u.packed.offset; | |
d4e2d15a ÆAB |
434 | st->open = open_istream_pack_non_delta; |
435 | return 0; | |
de94c0ea | 436 | } |
b6552836 ÆAB |
437 | /* fallthru */ |
438 | default: | |
d4e2d15a ÆAB |
439 | st->open = open_istream_incore; |
440 | return 0; | |
b6552836 ÆAB |
441 | } |
442 | } | |
443 | ||
47a02ff2 JH |
444 | /**************************************************************** |
445 | * Users of streaming interface | |
446 | ****************************************************************/ | |
447 | ||
b6552836 ÆAB |
448 | int close_istream(struct git_istream *st) |
449 | { | |
d4e2d15a | 450 | int r = st->close(st); |
b6552836 ÆAB |
451 | free(st); |
452 | return r; | |
453 | } | |
454 | ||
455 | ssize_t read_istream(struct git_istream *st, void *buf, size_t sz) | |
456 | { | |
d4e2d15a | 457 | return st->read(st, buf, sz); |
b6552836 ÆAB |
458 | } |
459 | ||
460 | struct git_istream *open_istream(struct repository *r, | |
461 | const struct object_id *oid, | |
462 | enum object_type *type, | |
463 | unsigned long *size, | |
464 | struct stream_filter *filter) | |
465 | { | |
de94c0ea | 466 | struct git_istream *st = xmalloc(sizeof(*st)); |
b6552836 | 467 | const struct object_id *real = lookup_replace_object(r, oid); |
d4e2d15a | 468 | int ret = istream_source(st, r, real, type); |
b6552836 | 469 | |
d4e2d15a | 470 | if (ret) { |
de94c0ea | 471 | free(st); |
b6552836 | 472 | return NULL; |
de94c0ea | 473 | } |
b6552836 | 474 | |
d4e2d15a | 475 | if (st->open(st, r, real, type)) { |
de94c0ea | 476 | if (open_istream_incore(st, r, real, type)) { |
b6552836 ÆAB |
477 | free(st); |
478 | return NULL; | |
479 | } | |
480 | } | |
481 | if (filter) { | |
482 | /* Add "&& !is_null_stream_filter(filter)" for performance */ | |
483 | struct git_istream *nst = attach_stream_filter(st, filter); | |
484 | if (!nst) { | |
485 | close_istream(st); | |
486 | return NULL; | |
487 | } | |
488 | st = nst; | |
489 | } | |
490 | ||
491 | *size = st->size; | |
492 | return st; | |
493 | } | |
494 | ||
7eda0e4f | 495 | int stream_blob_to_fd(int fd, const struct object_id *oid, struct stream_filter *filter, |
47a02ff2 JH |
496 | int can_seek) |
497 | { | |
498 | struct git_istream *st; | |
499 | enum object_type type; | |
500 | unsigned long sz; | |
501 | ssize_t kept = 0; | |
502 | int result = -1; | |
503 | ||
c8123e72 | 504 | st = open_istream(the_repository, oid, &type, &sz, filter); |
9ce4ad3e JK |
505 | if (!st) { |
506 | if (filter) | |
507 | free_stream_filter(filter); | |
47a02ff2 | 508 | return result; |
9ce4ad3e | 509 | } |
47a02ff2 JH |
510 | if (type != OBJ_BLOB) |
511 | goto close_and_exit; | |
512 | for (;;) { | |
513 | char buf[1024 * 16]; | |
514 | ssize_t wrote, holeto; | |
515 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
516 | ||
45d4bdae JK |
517 | if (readlen < 0) |
518 | goto close_and_exit; | |
47a02ff2 JH |
519 | if (!readlen) |
520 | break; | |
521 | if (can_seek && sizeof(buf) == readlen) { | |
522 | for (holeto = 0; holeto < readlen; holeto++) | |
523 | if (buf[holeto]) | |
524 | break; | |
525 | if (readlen == holeto) { | |
526 | kept += holeto; | |
527 | continue; | |
528 | } | |
529 | } | |
530 | ||
531 | if (kept && lseek(fd, kept, SEEK_CUR) == (off_t) -1) | |
532 | goto close_and_exit; | |
533 | else | |
534 | kept = 0; | |
535 | wrote = write_in_full(fd, buf, readlen); | |
536 | ||
564bde9a | 537 | if (wrote < 0) |
47a02ff2 JH |
538 | goto close_and_exit; |
539 | } | |
540 | if (kept && (lseek(fd, kept - 1, SEEK_CUR) == (off_t) -1 || | |
7edc02f4 | 541 | xwrite(fd, "", 1) != 1)) |
47a02ff2 JH |
542 | goto close_and_exit; |
543 | result = 0; | |
544 | ||
545 | close_and_exit: | |
546 | close_istream(st); | |
547 | return result; | |
548 | } |