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Commit | Line | Data |
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46bf0438 JH |
1 | /* |
2 | * Copyright (c) 2011, Google Inc. | |
3 | */ | |
4 | #include "cache.h" | |
5 | #include "streaming.h" | |
e35454fa SB |
6 | #include "repository.h" |
7 | #include "object-store.h" | |
84f80ad5 | 8 | #include "packfile.h" |
46bf0438 JH |
9 | |
10 | enum input_source { | |
11 | stream_error = -1, | |
12 | incore = 0, | |
13 | loose = 1, | |
14 | pack_non_delta = 2 | |
15 | }; | |
16 | ||
17 | typedef int (*open_istream_fn)(struct git_istream *, | |
18 | struct object_info *, | |
575042a0 | 19 | const struct object_id *, |
46bf0438 JH |
20 | enum object_type *); |
21 | typedef int (*close_istream_fn)(struct git_istream *); | |
22 | typedef ssize_t (*read_istream_fn)(struct git_istream *, char *, size_t); | |
23 | ||
24 | struct stream_vtbl { | |
25 | close_istream_fn close; | |
26 | read_istream_fn read; | |
27 | }; | |
28 | ||
29 | #define open_method_decl(name) \ | |
30 | int open_istream_ ##name \ | |
31 | (struct git_istream *st, struct object_info *oi, \ | |
575042a0 | 32 | const struct object_id *oid, \ |
46bf0438 JH |
33 | enum object_type *type) |
34 | ||
35 | #define close_method_decl(name) \ | |
36 | int close_istream_ ##name \ | |
37 | (struct git_istream *st) | |
38 | ||
39 | #define read_method_decl(name) \ | |
40 | ssize_t read_istream_ ##name \ | |
41 | (struct git_istream *st, char *buf, size_t sz) | |
42 | ||
43 | /* forward declaration */ | |
44 | static open_method_decl(incore); | |
45 | static open_method_decl(loose); | |
46 | static open_method_decl(pack_non_delta); | |
b6691092 JH |
47 | static struct git_istream *attach_stream_filter(struct git_istream *st, |
48 | struct stream_filter *filter); | |
49 | ||
46bf0438 JH |
50 | |
51 | static open_istream_fn open_istream_tbl[] = { | |
52 | open_istream_incore, | |
53 | open_istream_loose, | |
54 | open_istream_pack_non_delta, | |
55 | }; | |
56 | ||
b6691092 JH |
57 | #define FILTER_BUFFER (1024*16) |
58 | ||
59 | struct filtered_istream { | |
60 | struct git_istream *upstream; | |
61 | struct stream_filter *filter; | |
62 | char ibuf[FILTER_BUFFER]; | |
63 | char obuf[FILTER_BUFFER]; | |
64 | int i_end, i_ptr; | |
65 | int o_end, o_ptr; | |
4ae66704 | 66 | int input_finished; |
b6691092 JH |
67 | }; |
68 | ||
46bf0438 JH |
69 | struct git_istream { |
70 | const struct stream_vtbl *vtbl; | |
71 | unsigned long size; /* inflated size of full object */ | |
eb4f4076 | 72 | git_zstream z; |
7ef2d9a2 | 73 | enum { z_unused, z_used, z_done, z_error } z_state; |
46bf0438 JH |
74 | |
75 | union { | |
76 | struct { | |
77 | char *buf; /* from read_object() */ | |
78 | unsigned long read_ptr; | |
79 | } incore; | |
80 | ||
81 | struct { | |
93aa7bd5 JH |
82 | void *mapped; |
83 | unsigned long mapsize; | |
84 | char hdr[32]; | |
85 | int hdr_avail; | |
86 | int hdr_used; | |
46bf0438 JH |
87 | } loose; |
88 | ||
89 | struct { | |
7ef2d9a2 JH |
90 | struct packed_git *pack; |
91 | off_t pos; | |
46bf0438 | 92 | } in_pack; |
b6691092 JH |
93 | |
94 | struct filtered_istream filtered; | |
46bf0438 JH |
95 | } u; |
96 | }; | |
97 | ||
98 | int close_istream(struct git_istream *st) | |
99 | { | |
95dea6eb JK |
100 | int r = st->vtbl->close(st); |
101 | free(st); | |
102 | return r; | |
46bf0438 JH |
103 | } |
104 | ||
6163cd8a | 105 | ssize_t read_istream(struct git_istream *st, void *buf, size_t sz) |
46bf0438 JH |
106 | { |
107 | return st->vtbl->read(st, buf, sz); | |
108 | } | |
109 | ||
b383a13c | 110 | static enum input_source istream_source(const struct object_id *oid, |
46bf0438 JH |
111 | enum object_type *type, |
112 | struct object_info *oi) | |
113 | { | |
114 | unsigned long size; | |
115 | int status; | |
116 | ||
5b086407 | 117 | oi->typep = type; |
46bf0438 | 118 | oi->sizep = &size; |
b383a13c | 119 | status = oid_object_info_extended(oid, oi, 0); |
46bf0438 JH |
120 | if (status < 0) |
121 | return stream_error; | |
46bf0438 JH |
122 | |
123 | switch (oi->whence) { | |
124 | case OI_LOOSE: | |
125 | return loose; | |
126 | case OI_PACKED: | |
754980d0 | 127 | if (!oi->u.packed.is_delta && big_file_threshold < size) |
46bf0438 JH |
128 | return pack_non_delta; |
129 | /* fallthru */ | |
130 | default: | |
131 | return incore; | |
132 | } | |
133 | } | |
134 | ||
ef7b5195 | 135 | struct git_istream *open_istream(const struct object_id *oid, |
46bf0438 | 136 | enum object_type *type, |
b6691092 JH |
137 | unsigned long *size, |
138 | struct stream_filter *filter) | |
46bf0438 JH |
139 | { |
140 | struct git_istream *st; | |
27b5c1a0 | 141 | struct object_info oi = OBJECT_INFO_INIT; |
b383a13c | 142 | const struct object_id *real = lookup_replace_object(oid); |
46bf0438 JH |
143 | enum input_source src = istream_source(real, type, &oi); |
144 | ||
145 | if (src < 0) | |
146 | return NULL; | |
147 | ||
148 | st = xmalloc(sizeof(*st)); | |
b383a13c | 149 | if (open_istream_tbl[src](st, &oi, real, type)) { |
150 | if (open_istream_incore(st, &oi, real, type)) { | |
46bf0438 JH |
151 | free(st); |
152 | return NULL; | |
153 | } | |
154 | } | |
6a907786 | 155 | if (filter) { |
b6691092 JH |
156 | /* Add "&& !is_null_stream_filter(filter)" for performance */ |
157 | struct git_istream *nst = attach_stream_filter(st, filter); | |
78368f2c | 158 | if (!nst) { |
b6691092 | 159 | close_istream(st); |
78368f2c JH |
160 | return NULL; |
161 | } | |
b6691092 JH |
162 | st = nst; |
163 | } | |
164 | ||
46bf0438 JH |
165 | *size = st->size; |
166 | return st; | |
167 | } | |
168 | ||
7ef2d9a2 JH |
169 | |
170 | /***************************************************************** | |
171 | * | |
172 | * Common helpers | |
173 | * | |
174 | *****************************************************************/ | |
175 | ||
176 | static void close_deflated_stream(struct git_istream *st) | |
177 | { | |
178 | if (st->z_state == z_used) | |
179 | git_inflate_end(&st->z); | |
180 | } | |
181 | ||
182 | ||
b6691092 JH |
183 | /***************************************************************** |
184 | * | |
185 | * Filtered stream | |
186 | * | |
187 | *****************************************************************/ | |
188 | ||
189 | static close_method_decl(filtered) | |
190 | { | |
191 | free_stream_filter(st->u.filtered.filter); | |
192 | return close_istream(st->u.filtered.upstream); | |
193 | } | |
194 | ||
195 | static read_method_decl(filtered) | |
196 | { | |
197 | struct filtered_istream *fs = &(st->u.filtered); | |
198 | size_t filled = 0; | |
199 | ||
200 | while (sz) { | |
201 | /* do we already have filtered output? */ | |
202 | if (fs->o_ptr < fs->o_end) { | |
203 | size_t to_move = fs->o_end - fs->o_ptr; | |
204 | if (sz < to_move) | |
205 | to_move = sz; | |
206 | memcpy(buf + filled, fs->obuf + fs->o_ptr, to_move); | |
207 | fs->o_ptr += to_move; | |
208 | sz -= to_move; | |
209 | filled += to_move; | |
210 | continue; | |
211 | } | |
212 | fs->o_end = fs->o_ptr = 0; | |
213 | ||
214 | /* do we have anything to feed the filter with? */ | |
215 | if (fs->i_ptr < fs->i_end) { | |
216 | size_t to_feed = fs->i_end - fs->i_ptr; | |
217 | size_t to_receive = FILTER_BUFFER; | |
218 | if (stream_filter(fs->filter, | |
219 | fs->ibuf + fs->i_ptr, &to_feed, | |
220 | fs->obuf, &to_receive)) | |
221 | return -1; | |
222 | fs->i_ptr = fs->i_end - to_feed; | |
223 | fs->o_end = FILTER_BUFFER - to_receive; | |
224 | continue; | |
225 | } | |
4ae66704 JH |
226 | |
227 | /* tell the filter to drain upon no more input */ | |
228 | if (fs->input_finished) { | |
229 | size_t to_receive = FILTER_BUFFER; | |
230 | if (stream_filter(fs->filter, | |
231 | NULL, NULL, | |
232 | fs->obuf, &to_receive)) | |
233 | return -1; | |
234 | fs->o_end = FILTER_BUFFER - to_receive; | |
235 | if (!fs->o_end) | |
236 | break; | |
237 | continue; | |
238 | } | |
b6691092 JH |
239 | fs->i_end = fs->i_ptr = 0; |
240 | ||
241 | /* refill the input from the upstream */ | |
4ae66704 JH |
242 | if (!fs->input_finished) { |
243 | fs->i_end = read_istream(fs->upstream, fs->ibuf, FILTER_BUFFER); | |
244 | if (fs->i_end < 0) | |
42e7e2a5 | 245 | return -1; |
4ae66704 JH |
246 | if (fs->i_end) |
247 | continue; | |
248 | } | |
249 | fs->input_finished = 1; | |
b6691092 JH |
250 | } |
251 | return filled; | |
252 | } | |
253 | ||
254 | static struct stream_vtbl filtered_vtbl = { | |
255 | close_istream_filtered, | |
256 | read_istream_filtered, | |
257 | }; | |
258 | ||
259 | static struct git_istream *attach_stream_filter(struct git_istream *st, | |
260 | struct stream_filter *filter) | |
261 | { | |
262 | struct git_istream *ifs = xmalloc(sizeof(*ifs)); | |
263 | struct filtered_istream *fs = &(ifs->u.filtered); | |
264 | ||
265 | ifs->vtbl = &filtered_vtbl; | |
266 | fs->upstream = st; | |
267 | fs->filter = filter; | |
268 | fs->i_end = fs->i_ptr = 0; | |
269 | fs->o_end = fs->o_ptr = 0; | |
4ae66704 | 270 | fs->input_finished = 0; |
b6691092 JH |
271 | ifs->size = -1; /* unknown */ |
272 | return ifs; | |
273 | } | |
274 | ||
46bf0438 JH |
275 | /***************************************************************** |
276 | * | |
277 | * Loose object stream | |
278 | * | |
279 | *****************************************************************/ | |
280 | ||
93aa7bd5 JH |
281 | static read_method_decl(loose) |
282 | { | |
283 | size_t total_read = 0; | |
284 | ||
285 | switch (st->z_state) { | |
286 | case z_done: | |
287 | return 0; | |
288 | case z_error: | |
289 | return -1; | |
290 | default: | |
291 | break; | |
292 | } | |
293 | ||
294 | if (st->u.loose.hdr_used < st->u.loose.hdr_avail) { | |
295 | size_t to_copy = st->u.loose.hdr_avail - st->u.loose.hdr_used; | |
296 | if (sz < to_copy) | |
297 | to_copy = sz; | |
298 | memcpy(buf, st->u.loose.hdr + st->u.loose.hdr_used, to_copy); | |
299 | st->u.loose.hdr_used += to_copy; | |
300 | total_read += to_copy; | |
301 | } | |
302 | ||
303 | while (total_read < sz) { | |
304 | int status; | |
305 | ||
306 | st->z.next_out = (unsigned char *)buf + total_read; | |
307 | st->z.avail_out = sz - total_read; | |
308 | status = git_inflate(&st->z, Z_FINISH); | |
309 | ||
310 | total_read = st->z.next_out - (unsigned char *)buf; | |
311 | ||
312 | if (status == Z_STREAM_END) { | |
313 | git_inflate_end(&st->z); | |
314 | st->z_state = z_done; | |
315 | break; | |
316 | } | |
692f0bc7 | 317 | if (status != Z_OK && (status != Z_BUF_ERROR || total_read < sz)) { |
93aa7bd5 JH |
318 | git_inflate_end(&st->z); |
319 | st->z_state = z_error; | |
320 | return -1; | |
321 | } | |
322 | } | |
323 | return total_read; | |
324 | } | |
325 | ||
326 | static close_method_decl(loose) | |
327 | { | |
328 | close_deflated_stream(st); | |
329 | munmap(st->u.loose.mapped, st->u.loose.mapsize); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | static struct stream_vtbl loose_vtbl = { | |
334 | close_istream_loose, | |
335 | read_istream_loose, | |
336 | }; | |
337 | ||
46bf0438 JH |
338 | static open_method_decl(loose) |
339 | { | |
e35454fa | 340 | st->u.loose.mapped = map_sha1_file(the_repository, |
cf0b1793 | 341 | oid->hash, &st->u.loose.mapsize); |
93aa7bd5 JH |
342 | if (!st->u.loose.mapped) |
343 | return -1; | |
97026fe9 JH |
344 | if ((unpack_sha1_header(&st->z, |
345 | st->u.loose.mapped, | |
346 | st->u.loose.mapsize, | |
347 | st->u.loose.hdr, | |
348 | sizeof(st->u.loose.hdr)) < 0) || | |
349 | (parse_sha1_header(st->u.loose.hdr, &st->size) < 0)) { | |
93aa7bd5 JH |
350 | git_inflate_end(&st->z); |
351 | munmap(st->u.loose.mapped, st->u.loose.mapsize); | |
352 | return -1; | |
353 | } | |
354 | ||
93aa7bd5 JH |
355 | st->u.loose.hdr_used = strlen(st->u.loose.hdr) + 1; |
356 | st->u.loose.hdr_avail = st->z.total_out; | |
357 | st->z_state = z_used; | |
358 | ||
359 | st->vtbl = &loose_vtbl; | |
360 | return 0; | |
46bf0438 JH |
361 | } |
362 | ||
363 | ||
364 | /***************************************************************** | |
365 | * | |
366 | * Non-delta packed object stream | |
367 | * | |
368 | *****************************************************************/ | |
369 | ||
7ef2d9a2 JH |
370 | static read_method_decl(pack_non_delta) |
371 | { | |
372 | size_t total_read = 0; | |
373 | ||
374 | switch (st->z_state) { | |
375 | case z_unused: | |
376 | memset(&st->z, 0, sizeof(st->z)); | |
377 | git_inflate_init(&st->z); | |
378 | st->z_state = z_used; | |
379 | break; | |
380 | case z_done: | |
381 | return 0; | |
382 | case z_error: | |
383 | return -1; | |
384 | case z_used: | |
385 | break; | |
386 | } | |
387 | ||
388 | while (total_read < sz) { | |
389 | int status; | |
390 | struct pack_window *window = NULL; | |
391 | unsigned char *mapped; | |
392 | ||
393 | mapped = use_pack(st->u.in_pack.pack, &window, | |
394 | st->u.in_pack.pos, &st->z.avail_in); | |
395 | ||
396 | st->z.next_out = (unsigned char *)buf + total_read; | |
397 | st->z.avail_out = sz - total_read; | |
398 | st->z.next_in = mapped; | |
399 | status = git_inflate(&st->z, Z_FINISH); | |
400 | ||
401 | st->u.in_pack.pos += st->z.next_in - mapped; | |
402 | total_read = st->z.next_out - (unsigned char *)buf; | |
403 | unuse_pack(&window); | |
404 | ||
405 | if (status == Z_STREAM_END) { | |
406 | git_inflate_end(&st->z); | |
407 | st->z_state = z_done; | |
408 | break; | |
409 | } | |
410 | if (status != Z_OK && status != Z_BUF_ERROR) { | |
411 | git_inflate_end(&st->z); | |
412 | st->z_state = z_error; | |
413 | return -1; | |
414 | } | |
415 | } | |
416 | return total_read; | |
417 | } | |
418 | ||
419 | static close_method_decl(pack_non_delta) | |
420 | { | |
421 | close_deflated_stream(st); | |
422 | return 0; | |
423 | } | |
424 | ||
425 | static struct stream_vtbl pack_non_delta_vtbl = { | |
426 | close_istream_pack_non_delta, | |
427 | read_istream_pack_non_delta, | |
428 | }; | |
429 | ||
46bf0438 JH |
430 | static open_method_decl(pack_non_delta) |
431 | { | |
7ef2d9a2 JH |
432 | struct pack_window *window; |
433 | enum object_type in_pack_type; | |
434 | ||
435 | st->u.in_pack.pack = oi->u.packed.pack; | |
436 | st->u.in_pack.pos = oi->u.packed.offset; | |
437 | window = NULL; | |
438 | ||
439 | in_pack_type = unpack_object_header(st->u.in_pack.pack, | |
440 | &window, | |
441 | &st->u.in_pack.pos, | |
442 | &st->size); | |
443 | unuse_pack(&window); | |
444 | switch (in_pack_type) { | |
445 | default: | |
446 | return -1; /* we do not do deltas for now */ | |
447 | case OBJ_COMMIT: | |
448 | case OBJ_TREE: | |
449 | case OBJ_BLOB: | |
450 | case OBJ_TAG: | |
451 | break; | |
452 | } | |
453 | st->z_state = z_unused; | |
454 | st->vtbl = &pack_non_delta_vtbl; | |
455 | return 0; | |
46bf0438 JH |
456 | } |
457 | ||
458 | ||
459 | /***************************************************************** | |
460 | * | |
461 | * In-core stream | |
462 | * | |
463 | *****************************************************************/ | |
464 | ||
465 | static close_method_decl(incore) | |
466 | { | |
467 | free(st->u.incore.buf); | |
468 | return 0; | |
469 | } | |
470 | ||
471 | static read_method_decl(incore) | |
472 | { | |
473 | size_t read_size = sz; | |
474 | size_t remainder = st->size - st->u.incore.read_ptr; | |
475 | ||
476 | if (remainder <= read_size) | |
477 | read_size = remainder; | |
478 | if (read_size) { | |
479 | memcpy(buf, st->u.incore.buf + st->u.incore.read_ptr, read_size); | |
480 | st->u.incore.read_ptr += read_size; | |
481 | } | |
482 | return read_size; | |
483 | } | |
484 | ||
485 | static struct stream_vtbl incore_vtbl = { | |
486 | close_istream_incore, | |
487 | read_istream_incore, | |
488 | }; | |
489 | ||
490 | static open_method_decl(incore) | |
491 | { | |
b4f5aca4 | 492 | st->u.incore.buf = read_object_file_extended(oid, type, &st->size, 0); |
46bf0438 JH |
493 | st->u.incore.read_ptr = 0; |
494 | st->vtbl = &incore_vtbl; | |
495 | ||
496 | return st->u.incore.buf ? 0 : -1; | |
497 | } | |
47a02ff2 JH |
498 | |
499 | ||
500 | /**************************************************************** | |
501 | * Users of streaming interface | |
502 | ****************************************************************/ | |
503 | ||
7eda0e4f | 504 | int stream_blob_to_fd(int fd, const struct object_id *oid, struct stream_filter *filter, |
47a02ff2 JH |
505 | int can_seek) |
506 | { | |
507 | struct git_istream *st; | |
508 | enum object_type type; | |
509 | unsigned long sz; | |
510 | ssize_t kept = 0; | |
511 | int result = -1; | |
512 | ||
ef7b5195 | 513 | st = open_istream(oid, &type, &sz, filter); |
9ce4ad3e JK |
514 | if (!st) { |
515 | if (filter) | |
516 | free_stream_filter(filter); | |
47a02ff2 | 517 | return result; |
9ce4ad3e | 518 | } |
47a02ff2 JH |
519 | if (type != OBJ_BLOB) |
520 | goto close_and_exit; | |
521 | for (;;) { | |
522 | char buf[1024 * 16]; | |
523 | ssize_t wrote, holeto; | |
524 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
525 | ||
45d4bdae JK |
526 | if (readlen < 0) |
527 | goto close_and_exit; | |
47a02ff2 JH |
528 | if (!readlen) |
529 | break; | |
530 | if (can_seek && sizeof(buf) == readlen) { | |
531 | for (holeto = 0; holeto < readlen; holeto++) | |
532 | if (buf[holeto]) | |
533 | break; | |
534 | if (readlen == holeto) { | |
535 | kept += holeto; | |
536 | continue; | |
537 | } | |
538 | } | |
539 | ||
540 | if (kept && lseek(fd, kept, SEEK_CUR) == (off_t) -1) | |
541 | goto close_and_exit; | |
542 | else | |
543 | kept = 0; | |
544 | wrote = write_in_full(fd, buf, readlen); | |
545 | ||
564bde9a | 546 | if (wrote < 0) |
47a02ff2 JH |
547 | goto close_and_exit; |
548 | } | |
549 | if (kept && (lseek(fd, kept - 1, SEEK_CUR) == (off_t) -1 || | |
7edc02f4 | 550 | xwrite(fd, "", 1) != 1)) |
47a02ff2 JH |
551 | goto close_and_exit; |
552 | result = 0; | |
553 | ||
554 | close_and_exit: | |
555 | close_istream(st); | |
556 | return result; | |
557 | } |