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Commit | Line | Data |
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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" |
e35454fa | 10 | #include "object-store.h" |
47f351e9 | 11 | #include "replace-object.h" |
84f80ad5 | 12 | #include "packfile.h" |
d5ebb50d | 13 | #include "wrapper.h" |
46bf0438 | 14 | |
46bf0438 | 15 | typedef int (*open_istream_fn)(struct git_istream *, |
c8123e72 | 16 | struct repository *, |
575042a0 | 17 | const struct object_id *, |
46bf0438 JH |
18 | enum object_type *); |
19 | typedef int (*close_istream_fn)(struct git_istream *); | |
20 | typedef ssize_t (*read_istream_fn)(struct git_istream *, char *, size_t); | |
21 | ||
b6691092 JH |
22 | #define FILTER_BUFFER (1024*16) |
23 | ||
24 | struct filtered_istream { | |
25 | struct git_istream *upstream; | |
26 | struct stream_filter *filter; | |
27 | char ibuf[FILTER_BUFFER]; | |
28 | char obuf[FILTER_BUFFER]; | |
29 | int i_end, i_ptr; | |
30 | int o_end, o_ptr; | |
4ae66704 | 31 | int input_finished; |
b6691092 JH |
32 | }; |
33 | ||
46bf0438 | 34 | struct git_istream { |
d4e2d15a ÆAB |
35 | open_istream_fn open; |
36 | close_istream_fn close; | |
37 | read_istream_fn read; | |
38 | ||
46bf0438 | 39 | unsigned long size; /* inflated size of full object */ |
eb4f4076 | 40 | git_zstream z; |
7ef2d9a2 | 41 | enum { z_unused, z_used, z_done, z_error } z_state; |
46bf0438 JH |
42 | |
43 | union { | |
44 | struct { | |
34728d7f | 45 | char *buf; /* from oid_object_info_extended() */ |
46bf0438 JH |
46 | unsigned long read_ptr; |
47 | } incore; | |
48 | ||
49 | struct { | |
93aa7bd5 JH |
50 | void *mapped; |
51 | unsigned long mapsize; | |
52 | char hdr[32]; | |
53 | int hdr_avail; | |
54 | int hdr_used; | |
46bf0438 JH |
55 | } loose; |
56 | ||
57 | struct { | |
7ef2d9a2 JH |
58 | struct packed_git *pack; |
59 | off_t pos; | |
46bf0438 | 60 | } in_pack; |
b6691092 JH |
61 | |
62 | struct filtered_istream filtered; | |
46bf0438 JH |
63 | } u; |
64 | }; | |
65 | ||
7ef2d9a2 JH |
66 | /***************************************************************** |
67 | * | |
68 | * Common helpers | |
69 | * | |
70 | *****************************************************************/ | |
71 | ||
72 | static void close_deflated_stream(struct git_istream *st) | |
73 | { | |
74 | if (st->z_state == z_used) | |
75 | git_inflate_end(&st->z); | |
76 | } | |
77 | ||
78 | ||
b6691092 JH |
79 | /***************************************************************** |
80 | * | |
81 | * Filtered stream | |
82 | * | |
83 | *****************************************************************/ | |
84 | ||
bc062ad0 | 85 | static int close_istream_filtered(struct git_istream *st) |
b6691092 JH |
86 | { |
87 | free_stream_filter(st->u.filtered.filter); | |
88 | return close_istream(st->u.filtered.upstream); | |
89 | } | |
90 | ||
bc062ad0 ÆAB |
91 | static ssize_t read_istream_filtered(struct git_istream *st, char *buf, |
92 | size_t sz) | |
b6691092 JH |
93 | { |
94 | struct filtered_istream *fs = &(st->u.filtered); | |
95 | size_t filled = 0; | |
96 | ||
97 | while (sz) { | |
98 | /* do we already have filtered output? */ | |
99 | if (fs->o_ptr < fs->o_end) { | |
100 | size_t to_move = fs->o_end - fs->o_ptr; | |
101 | if (sz < to_move) | |
102 | to_move = sz; | |
103 | memcpy(buf + filled, fs->obuf + fs->o_ptr, to_move); | |
104 | fs->o_ptr += to_move; | |
105 | sz -= to_move; | |
106 | filled += to_move; | |
107 | continue; | |
108 | } | |
109 | fs->o_end = fs->o_ptr = 0; | |
110 | ||
111 | /* do we have anything to feed the filter with? */ | |
112 | if (fs->i_ptr < fs->i_end) { | |
113 | size_t to_feed = fs->i_end - fs->i_ptr; | |
114 | size_t to_receive = FILTER_BUFFER; | |
115 | if (stream_filter(fs->filter, | |
116 | fs->ibuf + fs->i_ptr, &to_feed, | |
117 | fs->obuf, &to_receive)) | |
118 | return -1; | |
119 | fs->i_ptr = fs->i_end - to_feed; | |
120 | fs->o_end = FILTER_BUFFER - to_receive; | |
121 | continue; | |
122 | } | |
4ae66704 JH |
123 | |
124 | /* tell the filter to drain upon no more input */ | |
125 | if (fs->input_finished) { | |
126 | size_t to_receive = FILTER_BUFFER; | |
127 | if (stream_filter(fs->filter, | |
128 | NULL, NULL, | |
129 | fs->obuf, &to_receive)) | |
130 | return -1; | |
131 | fs->o_end = FILTER_BUFFER - to_receive; | |
132 | if (!fs->o_end) | |
133 | break; | |
134 | continue; | |
135 | } | |
b6691092 JH |
136 | fs->i_end = fs->i_ptr = 0; |
137 | ||
138 | /* refill the input from the upstream */ | |
4ae66704 JH |
139 | if (!fs->input_finished) { |
140 | fs->i_end = read_istream(fs->upstream, fs->ibuf, FILTER_BUFFER); | |
141 | if (fs->i_end < 0) | |
42e7e2a5 | 142 | return -1; |
4ae66704 JH |
143 | if (fs->i_end) |
144 | continue; | |
145 | } | |
146 | fs->input_finished = 1; | |
b6691092 JH |
147 | } |
148 | return filled; | |
149 | } | |
150 | ||
b6691092 JH |
151 | static struct git_istream *attach_stream_filter(struct git_istream *st, |
152 | struct stream_filter *filter) | |
153 | { | |
154 | struct git_istream *ifs = xmalloc(sizeof(*ifs)); | |
155 | struct filtered_istream *fs = &(ifs->u.filtered); | |
156 | ||
d4e2d15a ÆAB |
157 | ifs->close = close_istream_filtered; |
158 | ifs->read = read_istream_filtered; | |
b6691092 JH |
159 | fs->upstream = st; |
160 | fs->filter = filter; | |
161 | fs->i_end = fs->i_ptr = 0; | |
162 | fs->o_end = fs->o_ptr = 0; | |
4ae66704 | 163 | fs->input_finished = 0; |
b6691092 JH |
164 | ifs->size = -1; /* unknown */ |
165 | return ifs; | |
166 | } | |
167 | ||
46bf0438 JH |
168 | /***************************************************************** |
169 | * | |
170 | * Loose object stream | |
171 | * | |
172 | *****************************************************************/ | |
173 | ||
bc062ad0 | 174 | static ssize_t read_istream_loose(struct git_istream *st, char *buf, size_t sz) |
93aa7bd5 JH |
175 | { |
176 | size_t total_read = 0; | |
177 | ||
178 | switch (st->z_state) { | |
179 | case z_done: | |
180 | return 0; | |
181 | case z_error: | |
182 | return -1; | |
183 | default: | |
184 | break; | |
185 | } | |
186 | ||
187 | if (st->u.loose.hdr_used < st->u.loose.hdr_avail) { | |
188 | size_t to_copy = st->u.loose.hdr_avail - st->u.loose.hdr_used; | |
189 | if (sz < to_copy) | |
190 | to_copy = sz; | |
191 | memcpy(buf, st->u.loose.hdr + st->u.loose.hdr_used, to_copy); | |
192 | st->u.loose.hdr_used += to_copy; | |
193 | total_read += to_copy; | |
194 | } | |
195 | ||
196 | while (total_read < sz) { | |
197 | int status; | |
198 | ||
199 | st->z.next_out = (unsigned char *)buf + total_read; | |
200 | st->z.avail_out = sz - total_read; | |
201 | status = git_inflate(&st->z, Z_FINISH); | |
202 | ||
203 | total_read = st->z.next_out - (unsigned char *)buf; | |
204 | ||
205 | if (status == Z_STREAM_END) { | |
206 | git_inflate_end(&st->z); | |
207 | st->z_state = z_done; | |
208 | break; | |
209 | } | |
692f0bc7 | 210 | if (status != Z_OK && (status != Z_BUF_ERROR || total_read < sz)) { |
93aa7bd5 JH |
211 | git_inflate_end(&st->z); |
212 | st->z_state = z_error; | |
213 | return -1; | |
214 | } | |
215 | } | |
216 | return total_read; | |
217 | } | |
218 | ||
bc062ad0 | 219 | static int close_istream_loose(struct git_istream *st) |
93aa7bd5 JH |
220 | { |
221 | close_deflated_stream(st); | |
222 | munmap(st->u.loose.mapped, st->u.loose.mapsize); | |
223 | return 0; | |
224 | } | |
225 | ||
bc062ad0 | 226 | static int open_istream_loose(struct git_istream *st, struct repository *r, |
bc062ad0 ÆAB |
227 | const struct object_id *oid, |
228 | enum object_type *type) | |
46bf0438 | 229 | { |
ddb3474b ÆAB |
230 | struct object_info oi = OBJECT_INFO_INIT; |
231 | oi.sizep = &st->size; | |
dccb32bf | 232 | oi.typep = type; |
ddb3474b | 233 | |
c8123e72 | 234 | st->u.loose.mapped = map_loose_object(r, oid, &st->u.loose.mapsize); |
93aa7bd5 JH |
235 | if (!st->u.loose.mapped) |
236 | return -1; | |
3b6a8db3 ÆAB |
237 | switch (unpack_loose_header(&st->z, st->u.loose.mapped, |
238 | st->u.loose.mapsize, st->u.loose.hdr, | |
239 | sizeof(st->u.loose.hdr), NULL)) { | |
240 | case ULHR_OK: | |
241 | break; | |
242 | case ULHR_BAD: | |
5848fb11 | 243 | case ULHR_TOO_LONG: |
3b6a8db3 | 244 | goto error; |
93aa7bd5 | 245 | } |
dccb32bf | 246 | if (parse_loose_header(st->u.loose.hdr, &oi) < 0 || *type < 0) |
3b6a8db3 | 247 | goto error; |
93aa7bd5 | 248 | |
93aa7bd5 JH |
249 | st->u.loose.hdr_used = strlen(st->u.loose.hdr) + 1; |
250 | st->u.loose.hdr_avail = st->z.total_out; | |
251 | st->z_state = z_used; | |
d4e2d15a ÆAB |
252 | st->close = close_istream_loose; |
253 | st->read = read_istream_loose; | |
93aa7bd5 | 254 | |
93aa7bd5 | 255 | return 0; |
3b6a8db3 ÆAB |
256 | error: |
257 | git_inflate_end(&st->z); | |
258 | munmap(st->u.loose.mapped, st->u.loose.mapsize); | |
259 | return -1; | |
46bf0438 JH |
260 | } |
261 | ||
262 | ||
263 | /***************************************************************** | |
264 | * | |
265 | * Non-delta packed object stream | |
266 | * | |
267 | *****************************************************************/ | |
268 | ||
bc062ad0 ÆAB |
269 | static ssize_t read_istream_pack_non_delta(struct git_istream *st, char *buf, |
270 | size_t sz) | |
7ef2d9a2 JH |
271 | { |
272 | size_t total_read = 0; | |
273 | ||
274 | switch (st->z_state) { | |
275 | case z_unused: | |
276 | memset(&st->z, 0, sizeof(st->z)); | |
277 | git_inflate_init(&st->z); | |
278 | st->z_state = z_used; | |
279 | break; | |
280 | case z_done: | |
281 | return 0; | |
282 | case z_error: | |
283 | return -1; | |
284 | case z_used: | |
285 | break; | |
286 | } | |
287 | ||
288 | while (total_read < sz) { | |
289 | int status; | |
290 | struct pack_window *window = NULL; | |
291 | unsigned char *mapped; | |
292 | ||
293 | mapped = use_pack(st->u.in_pack.pack, &window, | |
294 | st->u.in_pack.pos, &st->z.avail_in); | |
295 | ||
296 | st->z.next_out = (unsigned char *)buf + total_read; | |
297 | st->z.avail_out = sz - total_read; | |
298 | st->z.next_in = mapped; | |
299 | status = git_inflate(&st->z, Z_FINISH); | |
300 | ||
301 | st->u.in_pack.pos += st->z.next_in - mapped; | |
302 | total_read = st->z.next_out - (unsigned char *)buf; | |
303 | unuse_pack(&window); | |
304 | ||
305 | if (status == Z_STREAM_END) { | |
306 | git_inflate_end(&st->z); | |
307 | st->z_state = z_done; | |
308 | break; | |
309 | } | |
0afbe3e8 JK |
310 | |
311 | /* | |
312 | * Unlike the loose object case, we do not have to worry here | |
313 | * about running out of input bytes and spinning infinitely. If | |
314 | * we get Z_BUF_ERROR due to too few input bytes, then we'll | |
315 | * replenish them in the next use_pack() call when we loop. If | |
316 | * we truly hit the end of the pack (i.e., because it's corrupt | |
317 | * or truncated), then use_pack() catches that and will die(). | |
318 | */ | |
7ef2d9a2 JH |
319 | if (status != Z_OK && status != Z_BUF_ERROR) { |
320 | git_inflate_end(&st->z); | |
321 | st->z_state = z_error; | |
322 | return -1; | |
323 | } | |
324 | } | |
325 | return total_read; | |
326 | } | |
327 | ||
bc062ad0 | 328 | static int close_istream_pack_non_delta(struct git_istream *st) |
7ef2d9a2 JH |
329 | { |
330 | close_deflated_stream(st); | |
331 | return 0; | |
332 | } | |
333 | ||
bc062ad0 | 334 | static int open_istream_pack_non_delta(struct git_istream *st, |
5cf88fd8 ÆAB |
335 | struct repository *r UNUSED, |
336 | const struct object_id *oid UNUSED, | |
337 | enum object_type *type UNUSED) | |
46bf0438 | 338 | { |
7ef2d9a2 JH |
339 | struct pack_window *window; |
340 | enum object_type in_pack_type; | |
341 | ||
7ef2d9a2 JH |
342 | window = NULL; |
343 | ||
344 | in_pack_type = unpack_object_header(st->u.in_pack.pack, | |
345 | &window, | |
346 | &st->u.in_pack.pos, | |
347 | &st->size); | |
348 | unuse_pack(&window); | |
349 | switch (in_pack_type) { | |
350 | default: | |
351 | return -1; /* we do not do deltas for now */ | |
352 | case OBJ_COMMIT: | |
353 | case OBJ_TREE: | |
354 | case OBJ_BLOB: | |
355 | case OBJ_TAG: | |
356 | break; | |
357 | } | |
358 | st->z_state = z_unused; | |
d4e2d15a ÆAB |
359 | st->close = close_istream_pack_non_delta; |
360 | st->read = read_istream_pack_non_delta; | |
361 | ||
7ef2d9a2 | 362 | return 0; |
46bf0438 JH |
363 | } |
364 | ||
365 | ||
366 | /***************************************************************** | |
367 | * | |
368 | * In-core stream | |
369 | * | |
370 | *****************************************************************/ | |
371 | ||
bc062ad0 | 372 | static int close_istream_incore(struct git_istream *st) |
46bf0438 JH |
373 | { |
374 | free(st->u.incore.buf); | |
375 | return 0; | |
376 | } | |
377 | ||
bc062ad0 | 378 | static ssize_t read_istream_incore(struct git_istream *st, char *buf, size_t sz) |
46bf0438 JH |
379 | { |
380 | size_t read_size = sz; | |
381 | size_t remainder = st->size - st->u.incore.read_ptr; | |
382 | ||
383 | if (remainder <= read_size) | |
384 | read_size = remainder; | |
385 | if (read_size) { | |
386 | memcpy(buf, st->u.incore.buf + st->u.incore.read_ptr, read_size); | |
387 | st->u.incore.read_ptr += read_size; | |
388 | } | |
389 | return read_size; | |
390 | } | |
391 | ||
bc062ad0 | 392 | static int open_istream_incore(struct git_istream *st, struct repository *r, |
de94c0ea | 393 | const struct object_id *oid, enum object_type *type) |
46bf0438 | 394 | { |
34728d7f JK |
395 | struct object_info oi = OBJECT_INFO_INIT; |
396 | ||
46bf0438 | 397 | st->u.incore.read_ptr = 0; |
d4e2d15a ÆAB |
398 | st->close = close_istream_incore; |
399 | st->read = read_istream_incore; | |
46bf0438 | 400 | |
34728d7f JK |
401 | oi.typep = type; |
402 | oi.sizep = &st->size; | |
403 | oi.contentp = (void **)&st->u.incore.buf; | |
404 | return oid_object_info_extended(r, oid, &oi, | |
405 | OBJECT_INFO_DIE_IF_CORRUPT); | |
46bf0438 | 406 | } |
47a02ff2 | 407 | |
b6552836 ÆAB |
408 | /***************************************************************************** |
409 | * static helpers variables and functions for users of streaming interface | |
410 | *****************************************************************************/ | |
411 | ||
d4e2d15a ÆAB |
412 | static int istream_source(struct git_istream *st, |
413 | struct repository *r, | |
414 | const struct object_id *oid, | |
415 | enum object_type *type) | |
b6552836 ÆAB |
416 | { |
417 | unsigned long size; | |
418 | int status; | |
de94c0ea | 419 | struct object_info oi = OBJECT_INFO_INIT; |
b6552836 | 420 | |
de94c0ea ÆAB |
421 | oi.typep = type; |
422 | oi.sizep = &size; | |
423 | status = oid_object_info_extended(r, oid, &oi, 0); | |
b6552836 | 424 | if (status < 0) |
d4e2d15a | 425 | return status; |
b6552836 | 426 | |
de94c0ea | 427 | switch (oi.whence) { |
b6552836 | 428 | case OI_LOOSE: |
d4e2d15a ÆAB |
429 | st->open = open_istream_loose; |
430 | return 0; | |
b6552836 | 431 | case OI_PACKED: |
de94c0ea ÆAB |
432 | if (!oi.u.packed.is_delta && big_file_threshold < size) { |
433 | st->u.in_pack.pack = oi.u.packed.pack; | |
434 | st->u.in_pack.pos = oi.u.packed.offset; | |
d4e2d15a ÆAB |
435 | st->open = open_istream_pack_non_delta; |
436 | return 0; | |
de94c0ea | 437 | } |
b6552836 ÆAB |
438 | /* fallthru */ |
439 | default: | |
d4e2d15a ÆAB |
440 | st->open = open_istream_incore; |
441 | return 0; | |
b6552836 ÆAB |
442 | } |
443 | } | |
444 | ||
47a02ff2 JH |
445 | /**************************************************************** |
446 | * Users of streaming interface | |
447 | ****************************************************************/ | |
448 | ||
b6552836 ÆAB |
449 | int close_istream(struct git_istream *st) |
450 | { | |
d4e2d15a | 451 | int r = st->close(st); |
b6552836 ÆAB |
452 | free(st); |
453 | return r; | |
454 | } | |
455 | ||
456 | ssize_t read_istream(struct git_istream *st, void *buf, size_t sz) | |
457 | { | |
d4e2d15a | 458 | return st->read(st, buf, sz); |
b6552836 ÆAB |
459 | } |
460 | ||
461 | struct git_istream *open_istream(struct repository *r, | |
462 | const struct object_id *oid, | |
463 | enum object_type *type, | |
464 | unsigned long *size, | |
465 | struct stream_filter *filter) | |
466 | { | |
de94c0ea | 467 | struct git_istream *st = xmalloc(sizeof(*st)); |
b6552836 | 468 | const struct object_id *real = lookup_replace_object(r, oid); |
d4e2d15a | 469 | int ret = istream_source(st, r, real, type); |
b6552836 | 470 | |
d4e2d15a | 471 | if (ret) { |
de94c0ea | 472 | free(st); |
b6552836 | 473 | return NULL; |
de94c0ea | 474 | } |
b6552836 | 475 | |
d4e2d15a | 476 | if (st->open(st, r, real, type)) { |
de94c0ea | 477 | if (open_istream_incore(st, r, real, type)) { |
b6552836 ÆAB |
478 | free(st); |
479 | return NULL; | |
480 | } | |
481 | } | |
482 | if (filter) { | |
483 | /* Add "&& !is_null_stream_filter(filter)" for performance */ | |
484 | struct git_istream *nst = attach_stream_filter(st, filter); | |
485 | if (!nst) { | |
486 | close_istream(st); | |
487 | return NULL; | |
488 | } | |
489 | st = nst; | |
490 | } | |
491 | ||
492 | *size = st->size; | |
493 | return st; | |
494 | } | |
495 | ||
7eda0e4f | 496 | int stream_blob_to_fd(int fd, const struct object_id *oid, struct stream_filter *filter, |
47a02ff2 JH |
497 | int can_seek) |
498 | { | |
499 | struct git_istream *st; | |
500 | enum object_type type; | |
501 | unsigned long sz; | |
502 | ssize_t kept = 0; | |
503 | int result = -1; | |
504 | ||
c8123e72 | 505 | st = open_istream(the_repository, oid, &type, &sz, filter); |
9ce4ad3e JK |
506 | if (!st) { |
507 | if (filter) | |
508 | free_stream_filter(filter); | |
47a02ff2 | 509 | return result; |
9ce4ad3e | 510 | } |
47a02ff2 JH |
511 | if (type != OBJ_BLOB) |
512 | goto close_and_exit; | |
513 | for (;;) { | |
514 | char buf[1024 * 16]; | |
515 | ssize_t wrote, holeto; | |
516 | ssize_t readlen = read_istream(st, buf, sizeof(buf)); | |
517 | ||
45d4bdae JK |
518 | if (readlen < 0) |
519 | goto close_and_exit; | |
47a02ff2 JH |
520 | if (!readlen) |
521 | break; | |
522 | if (can_seek && sizeof(buf) == readlen) { | |
523 | for (holeto = 0; holeto < readlen; holeto++) | |
524 | if (buf[holeto]) | |
525 | break; | |
526 | if (readlen == holeto) { | |
527 | kept += holeto; | |
528 | continue; | |
529 | } | |
530 | } | |
531 | ||
532 | if (kept && lseek(fd, kept, SEEK_CUR) == (off_t) -1) | |
533 | goto close_and_exit; | |
534 | else | |
535 | kept = 0; | |
536 | wrote = write_in_full(fd, buf, readlen); | |
537 | ||
564bde9a | 538 | if (wrote < 0) |
47a02ff2 JH |
539 | goto close_and_exit; |
540 | } | |
541 | if (kept && (lseek(fd, kept - 1, SEEK_CUR) == (off_t) -1 || | |
7edc02f4 | 542 | xwrite(fd, "", 1) != 1)) |
47a02ff2 JH |
543 | goto close_and_exit; |
544 | result = 0; | |
545 | ||
546 | close_and_exit: | |
547 | close_istream(st); | |
548 | return result; | |
549 | } |