2 Copyright 2020 Google LLC
4 Use of this source code is governed by a BSD-style
5 license that can be found in the LICENSE file or at
6 https://developers.google.com/open-source/licenses/bsd
9 /* record.c - methods for different types of records. */
14 #include "constants.h"
15 #include "reftable-error.h"
18 static struct reftable_record_vtable
*
19 reftable_record_vtable(struct reftable_record
*rec
);
20 static void *reftable_record_data(struct reftable_record
*rec
);
22 int get_var_int(uint64_t *dest
, struct string_view
*in
)
29 val
= in
->buf
[ptr
] & 0x7f;
31 while (in
->buf
[ptr
] & 0x80) {
36 val
= (val
+ 1) << 7 | (uint64_t)(in
->buf
[ptr
] & 0x7f);
43 int put_var_int(struct string_view
*dest
, uint64_t val
)
45 uint8_t buf
[10] = { 0 };
48 buf
[i
] = (uint8_t)(val
& 0x7f);
56 buf
[i
] = 0x80 | (uint8_t)(val
& 0x7f);
60 n
= sizeof(buf
) - i
- 1;
63 memcpy(dest
->buf
, &buf
[i
+ 1], n
);
67 int reftable_is_block_type(uint8_t typ
)
73 case BLOCK_TYPE_INDEX
:
79 const unsigned char *reftable_ref_record_val1(const struct reftable_ref_record
*rec
)
81 switch (rec
->value_type
) {
82 case REFTABLE_REF_VAL1
:
83 return rec
->value
.val1
;
84 case REFTABLE_REF_VAL2
:
85 return rec
->value
.val2
.value
;
91 const unsigned char *reftable_ref_record_val2(const struct reftable_ref_record
*rec
)
93 switch (rec
->value_type
) {
94 case REFTABLE_REF_VAL2
:
95 return rec
->value
.val2
.target_value
;
101 static int decode_string(struct strbuf
*dest
, struct string_view in
)
103 int start_len
= in
.len
;
105 int n
= get_var_int(&tsize
, &in
);
108 string_view_consume(&in
, n
);
113 strbuf_add(dest
, in
.buf
, tsize
);
114 string_view_consume(&in
, tsize
);
116 return start_len
- in
.len
;
119 static int encode_string(char *str
, struct string_view s
)
121 struct string_view start
= s
;
123 int n
= put_var_int(&s
, l
);
126 string_view_consume(&s
, n
);
129 memcpy(s
.buf
, str
, l
);
130 string_view_consume(&s
, l
);
132 return start
.len
- s
.len
;
135 int reftable_encode_key(int *restart
, struct string_view dest
,
136 struct strbuf prev_key
, struct strbuf key
,
139 struct string_view start
= dest
;
140 int prefix_len
= common_prefix_size(&prev_key
, &key
);
141 uint64_t suffix_len
= key
.len
- prefix_len
;
142 int n
= put_var_int(&dest
, (uint64_t)prefix_len
);
145 string_view_consume(&dest
, n
);
147 *restart
= (prefix_len
== 0);
149 n
= put_var_int(&dest
, suffix_len
<< 3 | (uint64_t)extra
);
152 string_view_consume(&dest
, n
);
154 if (dest
.len
< suffix_len
)
156 memcpy(dest
.buf
, key
.buf
+ prefix_len
, suffix_len
);
157 string_view_consume(&dest
, suffix_len
);
159 return start
.len
- dest
.len
;
162 int reftable_decode_key(struct strbuf
*key
, uint8_t *extra
,
163 struct strbuf last_key
, struct string_view in
)
165 int start_len
= in
.len
;
166 uint64_t prefix_len
= 0;
167 uint64_t suffix_len
= 0;
168 int n
= get_var_int(&prefix_len
, &in
);
171 string_view_consume(&in
, n
);
173 if (prefix_len
> last_key
.len
)
176 n
= get_var_int(&suffix_len
, &in
);
179 string_view_consume(&in
, n
);
181 *extra
= (uint8_t)(suffix_len
& 0x7);
184 if (in
.len
< suffix_len
)
188 strbuf_add(key
, last_key
.buf
, prefix_len
);
189 strbuf_add(key
, in
.buf
, suffix_len
);
190 string_view_consume(&in
, suffix_len
);
192 return start_len
- in
.len
;
195 static void reftable_ref_record_key(const void *r
, struct strbuf
*dest
)
197 const struct reftable_ref_record
*rec
=
198 (const struct reftable_ref_record
*)r
;
200 strbuf_addstr(dest
, rec
->refname
);
203 static void reftable_ref_record_copy_from(void *rec
, const void *src_rec
,
206 struct reftable_ref_record
*ref
= rec
;
207 const struct reftable_ref_record
*src
= src_rec
;
208 assert(hash_size
> 0);
210 /* This is simple and correct, but we could probably reuse the hash
212 reftable_ref_record_release(ref
);
214 ref
->refname
= xstrdup(src
->refname
);
216 ref
->update_index
= src
->update_index
;
217 ref
->value_type
= src
->value_type
;
218 switch (src
->value_type
) {
219 case REFTABLE_REF_DELETION
:
221 case REFTABLE_REF_VAL1
:
222 memcpy(ref
->value
.val1
, src
->value
.val1
, hash_size
);
224 case REFTABLE_REF_VAL2
:
225 memcpy(ref
->value
.val2
.value
, src
->value
.val2
.value
, hash_size
);
226 memcpy(ref
->value
.val2
.target_value
,
227 src
->value
.val2
.target_value
, hash_size
);
229 case REFTABLE_REF_SYMREF
:
230 ref
->value
.symref
= xstrdup(src
->value
.symref
);
235 static char hexdigit(int c
)
239 return 'a' + (c
- 10);
242 static void hex_format(char *dest
, const unsigned char *src
, int hash_size
)
244 assert(hash_size
> 0);
247 for (i
= 0; i
< hash_size
; i
++) {
248 dest
[2 * i
] = hexdigit(src
[i
] >> 4);
249 dest
[2 * i
+ 1] = hexdigit(src
[i
] & 0xf);
251 dest
[2 * hash_size
] = 0;
255 static void reftable_ref_record_print_sz(const struct reftable_ref_record
*ref
,
258 char hex
[GIT_MAX_HEXSZ
+ 1] = { 0 }; /* BUG */
259 printf("ref{%s(%" PRIu64
") ", ref
->refname
, ref
->update_index
);
260 switch (ref
->value_type
) {
261 case REFTABLE_REF_SYMREF
:
262 printf("=> %s", ref
->value
.symref
);
264 case REFTABLE_REF_VAL2
:
265 hex_format(hex
, ref
->value
.val2
.value
, hash_size
);
266 printf("val 2 %s", hex
);
267 hex_format(hex
, ref
->value
.val2
.target_value
,
269 printf("(T %s)", hex
);
271 case REFTABLE_REF_VAL1
:
272 hex_format(hex
, ref
->value
.val1
, hash_size
);
273 printf("val 1 %s", hex
);
275 case REFTABLE_REF_DELETION
:
282 void reftable_ref_record_print(const struct reftable_ref_record
*ref
,
284 reftable_ref_record_print_sz(ref
, hash_size(hash_id
));
287 static void reftable_ref_record_release_void(void *rec
)
289 reftable_ref_record_release(rec
);
292 void reftable_ref_record_release(struct reftable_ref_record
*ref
)
294 switch (ref
->value_type
) {
295 case REFTABLE_REF_SYMREF
:
296 reftable_free(ref
->value
.symref
);
298 case REFTABLE_REF_VAL2
:
300 case REFTABLE_REF_VAL1
:
302 case REFTABLE_REF_DELETION
:
308 reftable_free(ref
->refname
);
309 memset(ref
, 0, sizeof(struct reftable_ref_record
));
312 static uint8_t reftable_ref_record_val_type(const void *rec
)
314 const struct reftable_ref_record
*r
=
315 (const struct reftable_ref_record
*)rec
;
316 return r
->value_type
;
319 static int reftable_ref_record_encode(const void *rec
, struct string_view s
,
322 const struct reftable_ref_record
*r
=
323 (const struct reftable_ref_record
*)rec
;
324 struct string_view start
= s
;
325 int n
= put_var_int(&s
, r
->update_index
);
326 assert(hash_size
> 0);
329 string_view_consume(&s
, n
);
331 switch (r
->value_type
) {
332 case REFTABLE_REF_SYMREF
:
333 n
= encode_string(r
->value
.symref
, s
);
337 string_view_consume(&s
, n
);
339 case REFTABLE_REF_VAL2
:
340 if (s
.len
< 2 * hash_size
) {
343 memcpy(s
.buf
, r
->value
.val2
.value
, hash_size
);
344 string_view_consume(&s
, hash_size
);
345 memcpy(s
.buf
, r
->value
.val2
.target_value
, hash_size
);
346 string_view_consume(&s
, hash_size
);
348 case REFTABLE_REF_VAL1
:
349 if (s
.len
< hash_size
) {
352 memcpy(s
.buf
, r
->value
.val1
, hash_size
);
353 string_view_consume(&s
, hash_size
);
355 case REFTABLE_REF_DELETION
:
361 return start
.len
- s
.len
;
364 static int reftable_ref_record_decode(void *rec
, struct strbuf key
,
365 uint8_t val_type
, struct string_view in
,
368 struct reftable_ref_record
*r
= rec
;
369 struct string_view start
= in
;
370 uint64_t update_index
= 0;
371 int n
= get_var_int(&update_index
, &in
);
374 string_view_consume(&in
, n
);
376 reftable_ref_record_release(r
);
378 assert(hash_size
> 0);
380 r
->refname
= reftable_malloc(key
.len
+ 1);
381 memcpy(r
->refname
, key
.buf
, key
.len
);
382 r
->refname
[key
.len
] = 0;
384 r
->update_index
= update_index
;
385 r
->value_type
= val_type
;
387 case REFTABLE_REF_VAL1
:
388 if (in
.len
< hash_size
) {
392 memcpy(r
->value
.val1
, in
.buf
, hash_size
);
393 string_view_consume(&in
, hash_size
);
396 case REFTABLE_REF_VAL2
:
397 if (in
.len
< 2 * hash_size
) {
401 memcpy(r
->value
.val2
.value
, in
.buf
, hash_size
);
402 string_view_consume(&in
, hash_size
);
404 memcpy(r
->value
.val2
.target_value
, in
.buf
, hash_size
);
405 string_view_consume(&in
, hash_size
);
408 case REFTABLE_REF_SYMREF
: {
409 struct strbuf dest
= STRBUF_INIT
;
410 int n
= decode_string(&dest
, in
);
414 string_view_consume(&in
, n
);
415 r
->value
.symref
= dest
.buf
;
418 case REFTABLE_REF_DELETION
:
425 return start
.len
- in
.len
;
428 static int reftable_ref_record_is_deletion_void(const void *p
)
430 return reftable_ref_record_is_deletion(
431 (const struct reftable_ref_record
*)p
);
434 static int reftable_ref_record_equal_void(const void *a
,
435 const void *b
, int hash_size
)
437 struct reftable_ref_record
*ra
= (struct reftable_ref_record
*) a
;
438 struct reftable_ref_record
*rb
= (struct reftable_ref_record
*) b
;
439 return reftable_ref_record_equal(ra
, rb
, hash_size
);
442 static int reftable_ref_record_cmp_void(const void *_a
, const void *_b
)
444 const struct reftable_ref_record
*a
= _a
;
445 const struct reftable_ref_record
*b
= _b
;
446 return strcmp(a
->refname
, b
->refname
);
449 static void reftable_ref_record_print_void(const void *rec
,
452 reftable_ref_record_print_sz((struct reftable_ref_record
*) rec
, hash_size
);
455 static struct reftable_record_vtable reftable_ref_record_vtable
= {
456 .key
= &reftable_ref_record_key
,
457 .type
= BLOCK_TYPE_REF
,
458 .copy_from
= &reftable_ref_record_copy_from
,
459 .val_type
= &reftable_ref_record_val_type
,
460 .encode
= &reftable_ref_record_encode
,
461 .decode
= &reftable_ref_record_decode
,
462 .release
= &reftable_ref_record_release_void
,
463 .is_deletion
= &reftable_ref_record_is_deletion_void
,
464 .equal
= &reftable_ref_record_equal_void
,
465 .cmp
= &reftable_ref_record_cmp_void
,
466 .print
= &reftable_ref_record_print_void
,
469 static void reftable_obj_record_key(const void *r
, struct strbuf
*dest
)
471 const struct reftable_obj_record
*rec
=
472 (const struct reftable_obj_record
*)r
;
474 strbuf_add(dest
, rec
->hash_prefix
, rec
->hash_prefix_len
);
477 static void reftable_obj_record_release(void *rec
)
479 struct reftable_obj_record
*obj
= rec
;
480 FREE_AND_NULL(obj
->hash_prefix
);
481 FREE_AND_NULL(obj
->offsets
);
482 memset(obj
, 0, sizeof(struct reftable_obj_record
));
485 static void reftable_obj_record_print(const void *rec
, int hash_size
)
487 const struct reftable_obj_record
*obj
= rec
;
488 char hex
[GIT_MAX_HEXSZ
+ 1] = { 0 };
489 struct strbuf offset_str
= STRBUF_INIT
;
492 for (i
= 0; i
< obj
->offset_len
; i
++)
493 strbuf_addf(&offset_str
, "%" PRIu64
" ", obj
->offsets
[i
]);
494 hex_format(hex
, obj
->hash_prefix
, obj
->hash_prefix_len
);
495 printf("prefix %s (len %d), offsets [%s]\n",
496 hex
, obj
->hash_prefix_len
, offset_str
.buf
);
497 strbuf_release(&offset_str
);
500 static void reftable_obj_record_copy_from(void *rec
, const void *src_rec
,
503 struct reftable_obj_record
*obj
= rec
;
504 const struct reftable_obj_record
*src
=
505 (const struct reftable_obj_record
*)src_rec
;
507 reftable_obj_record_release(obj
);
509 REFTABLE_ALLOC_ARRAY(obj
->hash_prefix
, src
->hash_prefix_len
);
510 obj
->hash_prefix_len
= src
->hash_prefix_len
;
511 if (src
->hash_prefix_len
)
512 memcpy(obj
->hash_prefix
, src
->hash_prefix
, obj
->hash_prefix_len
);
514 REFTABLE_ALLOC_ARRAY(obj
->offsets
, src
->offset_len
);
515 obj
->offset_len
= src
->offset_len
;
516 COPY_ARRAY(obj
->offsets
, src
->offsets
, src
->offset_len
);
519 static uint8_t reftable_obj_record_val_type(const void *rec
)
521 const struct reftable_obj_record
*r
= rec
;
522 if (r
->offset_len
> 0 && r
->offset_len
< 8)
523 return r
->offset_len
;
527 static int reftable_obj_record_encode(const void *rec
, struct string_view s
,
530 const struct reftable_obj_record
*r
= rec
;
531 struct string_view start
= s
;
535 if (r
->offset_len
== 0 || r
->offset_len
>= 8) {
536 n
= put_var_int(&s
, r
->offset_len
);
540 string_view_consume(&s
, n
);
542 if (r
->offset_len
== 0)
543 return start
.len
- s
.len
;
544 n
= put_var_int(&s
, r
->offsets
[0]);
547 string_view_consume(&s
, n
);
549 last
= r
->offsets
[0];
550 for (i
= 1; i
< r
->offset_len
; i
++) {
551 int n
= put_var_int(&s
, r
->offsets
[i
] - last
);
555 string_view_consume(&s
, n
);
556 last
= r
->offsets
[i
];
558 return start
.len
- s
.len
;
561 static int reftable_obj_record_decode(void *rec
, struct strbuf key
,
562 uint8_t val_type
, struct string_view in
,
565 struct string_view start
= in
;
566 struct reftable_obj_record
*r
= rec
;
567 uint64_t count
= val_type
;
572 REFTABLE_ALLOC_ARRAY(r
->hash_prefix
, key
.len
);
573 memcpy(r
->hash_prefix
, key
.buf
, key
.len
);
574 r
->hash_prefix_len
= key
.len
;
577 n
= get_var_int(&count
, &in
);
582 string_view_consume(&in
, n
);
588 return start
.len
- in
.len
;
590 REFTABLE_ALLOC_ARRAY(r
->offsets
, count
);
591 r
->offset_len
= count
;
593 n
= get_var_int(&r
->offsets
[0], &in
);
596 string_view_consume(&in
, n
);
598 last
= r
->offsets
[0];
602 int n
= get_var_int(&delta
, &in
);
606 string_view_consume(&in
, n
);
608 last
= r
->offsets
[j
] = (delta
+ last
);
611 return start
.len
- in
.len
;
614 static int not_a_deletion(const void *p
)
619 static int reftable_obj_record_equal_void(const void *a
, const void *b
, int hash_size
)
621 struct reftable_obj_record
*ra
= (struct reftable_obj_record
*) a
;
622 struct reftable_obj_record
*rb
= (struct reftable_obj_record
*) b
;
624 if (ra
->hash_prefix_len
!= rb
->hash_prefix_len
625 || ra
->offset_len
!= rb
->offset_len
)
628 if (ra
->hash_prefix_len
&&
629 memcmp(ra
->hash_prefix
, rb
->hash_prefix
, ra
->hash_prefix_len
))
631 if (ra
->offset_len
&&
632 memcmp(ra
->offsets
, rb
->offsets
, ra
->offset_len
* sizeof(uint64_t)))
638 static int reftable_obj_record_cmp_void(const void *_a
, const void *_b
)
640 const struct reftable_obj_record
*a
= _a
;
641 const struct reftable_obj_record
*b
= _b
;
644 cmp
= memcmp(a
->hash_prefix
, b
->hash_prefix
,
645 a
->hash_prefix_len
> b
->hash_prefix_len
?
646 a
->hash_prefix_len
: b
->hash_prefix_len
);
651 * When the prefix is the same then the object record that is longer is
652 * considered to be bigger.
654 return a
->hash_prefix_len
- b
->hash_prefix_len
;
657 static struct reftable_record_vtable reftable_obj_record_vtable
= {
658 .key
= &reftable_obj_record_key
,
659 .type
= BLOCK_TYPE_OBJ
,
660 .copy_from
= &reftable_obj_record_copy_from
,
661 .val_type
= &reftable_obj_record_val_type
,
662 .encode
= &reftable_obj_record_encode
,
663 .decode
= &reftable_obj_record_decode
,
664 .release
= &reftable_obj_record_release
,
665 .is_deletion
= ¬_a_deletion
,
666 .equal
= &reftable_obj_record_equal_void
,
667 .cmp
= &reftable_obj_record_cmp_void
,
668 .print
= &reftable_obj_record_print
,
671 static void reftable_log_record_print_sz(struct reftable_log_record
*log
,
674 char hex
[GIT_MAX_HEXSZ
+ 1] = { 0 };
676 switch (log
->value_type
) {
677 case REFTABLE_LOG_DELETION
:
678 printf("log{%s(%" PRIu64
") delete\n", log
->refname
,
681 case REFTABLE_LOG_UPDATE
:
682 printf("log{%s(%" PRIu64
") %s <%s> %" PRIu64
" %04d\n",
683 log
->refname
, log
->update_index
,
684 log
->value
.update
.name
? log
->value
.update
.name
: "",
685 log
->value
.update
.email
? log
->value
.update
.email
: "",
686 log
->value
.update
.time
,
687 log
->value
.update
.tz_offset
);
688 hex_format(hex
, log
->value
.update
.old_hash
, hash_size
);
689 printf("%s => ", hex
);
690 hex_format(hex
, log
->value
.update
.new_hash
, hash_size
);
691 printf("%s\n\n%s\n}\n", hex
,
692 log
->value
.update
.message
? log
->value
.update
.message
: "");
697 void reftable_log_record_print(struct reftable_log_record
*log
,
700 reftable_log_record_print_sz(log
, hash_size(hash_id
));
703 static void reftable_log_record_key(const void *r
, struct strbuf
*dest
)
705 const struct reftable_log_record
*rec
=
706 (const struct reftable_log_record
*)r
;
707 int len
= strlen(rec
->refname
);
711 strbuf_add(dest
, (uint8_t *)rec
->refname
, len
+ 1);
713 ts
= (~ts
) - rec
->update_index
;
714 put_be64(&i64
[0], ts
);
715 strbuf_add(dest
, i64
, sizeof(i64
));
718 static void reftable_log_record_copy_from(void *rec
, const void *src_rec
,
721 struct reftable_log_record
*dst
= rec
;
722 const struct reftable_log_record
*src
=
723 (const struct reftable_log_record
*)src_rec
;
725 reftable_log_record_release(dst
);
728 dst
->refname
= xstrdup(dst
->refname
);
730 switch (dst
->value_type
) {
731 case REFTABLE_LOG_DELETION
:
733 case REFTABLE_LOG_UPDATE
:
734 if (dst
->value
.update
.email
) {
735 dst
->value
.update
.email
=
736 xstrdup(dst
->value
.update
.email
);
738 if (dst
->value
.update
.name
) {
739 dst
->value
.update
.name
=
740 xstrdup(dst
->value
.update
.name
);
742 if (dst
->value
.update
.message
) {
743 dst
->value
.update
.message
=
744 xstrdup(dst
->value
.update
.message
);
747 if (dst
->value
.update
.new_hash
) {
748 REFTABLE_ALLOC_ARRAY(dst
->value
.update
.new_hash
, hash_size
);
749 memcpy(dst
->value
.update
.new_hash
,
750 src
->value
.update
.new_hash
, hash_size
);
752 if (dst
->value
.update
.old_hash
) {
753 REFTABLE_ALLOC_ARRAY(dst
->value
.update
.old_hash
, hash_size
);
754 memcpy(dst
->value
.update
.old_hash
,
755 src
->value
.update
.old_hash
, hash_size
);
761 static void reftable_log_record_release_void(void *rec
)
763 struct reftable_log_record
*r
= rec
;
764 reftable_log_record_release(r
);
767 void reftable_log_record_release(struct reftable_log_record
*r
)
769 reftable_free(r
->refname
);
770 switch (r
->value_type
) {
771 case REFTABLE_LOG_DELETION
:
773 case REFTABLE_LOG_UPDATE
:
774 reftable_free(r
->value
.update
.new_hash
);
775 reftable_free(r
->value
.update
.old_hash
);
776 reftable_free(r
->value
.update
.name
);
777 reftable_free(r
->value
.update
.email
);
778 reftable_free(r
->value
.update
.message
);
781 memset(r
, 0, sizeof(struct reftable_log_record
));
784 static uint8_t reftable_log_record_val_type(const void *rec
)
786 const struct reftable_log_record
*log
=
787 (const struct reftable_log_record
*)rec
;
789 return reftable_log_record_is_deletion(log
) ? 0 : 1;
792 static uint8_t zero
[GIT_SHA256_RAWSZ
] = { 0 };
794 static int reftable_log_record_encode(const void *rec
, struct string_view s
,
797 const struct reftable_log_record
*r
= rec
;
798 struct string_view start
= s
;
800 uint8_t *oldh
= NULL
;
801 uint8_t *newh
= NULL
;
802 if (reftable_log_record_is_deletion(r
))
805 oldh
= r
->value
.update
.old_hash
;
806 newh
= r
->value
.update
.new_hash
;
814 if (s
.len
< 2 * hash_size
)
817 memcpy(s
.buf
, oldh
, hash_size
);
818 memcpy(s
.buf
+ hash_size
, newh
, hash_size
);
819 string_view_consume(&s
, 2 * hash_size
);
821 n
= encode_string(r
->value
.update
.name
? r
->value
.update
.name
: "", s
);
824 string_view_consume(&s
, n
);
826 n
= encode_string(r
->value
.update
.email
? r
->value
.update
.email
: "",
830 string_view_consume(&s
, n
);
832 n
= put_var_int(&s
, r
->value
.update
.time
);
835 string_view_consume(&s
, n
);
840 put_be16(s
.buf
, r
->value
.update
.tz_offset
);
841 string_view_consume(&s
, 2);
844 r
->value
.update
.message
? r
->value
.update
.message
: "", s
);
847 string_view_consume(&s
, n
);
849 return start
.len
- s
.len
;
852 static int reftable_log_record_decode(void *rec
, struct strbuf key
,
853 uint8_t val_type
, struct string_view in
,
856 struct string_view start
= in
;
857 struct reftable_log_record
*r
= rec
;
860 struct strbuf dest
= STRBUF_INIT
;
863 if (key
.len
<= 9 || key
.buf
[key
.len
- 9] != 0)
864 return REFTABLE_FORMAT_ERROR
;
866 r
->refname
= reftable_realloc(r
->refname
, key
.len
- 8);
867 memcpy(r
->refname
, key
.buf
, key
.len
- 8);
868 ts
= get_be64(key
.buf
+ key
.len
- 8);
870 r
->update_index
= (~max
) - ts
;
872 if (val_type
!= r
->value_type
) {
873 switch (r
->value_type
) {
874 case REFTABLE_LOG_UPDATE
:
875 FREE_AND_NULL(r
->value
.update
.old_hash
);
876 FREE_AND_NULL(r
->value
.update
.new_hash
);
877 FREE_AND_NULL(r
->value
.update
.message
);
878 FREE_AND_NULL(r
->value
.update
.email
);
879 FREE_AND_NULL(r
->value
.update
.name
);
881 case REFTABLE_LOG_DELETION
:
886 r
->value_type
= val_type
;
887 if (val_type
== REFTABLE_LOG_DELETION
)
890 if (in
.len
< 2 * hash_size
)
891 return REFTABLE_FORMAT_ERROR
;
893 r
->value
.update
.old_hash
=
894 reftable_realloc(r
->value
.update
.old_hash
, hash_size
);
895 r
->value
.update
.new_hash
=
896 reftable_realloc(r
->value
.update
.new_hash
, hash_size
);
898 memcpy(r
->value
.update
.old_hash
, in
.buf
, hash_size
);
899 memcpy(r
->value
.update
.new_hash
, in
.buf
+ hash_size
, hash_size
);
901 string_view_consume(&in
, 2 * hash_size
);
903 n
= decode_string(&dest
, in
);
906 string_view_consume(&in
, n
);
908 r
->value
.update
.name
=
909 reftable_realloc(r
->value
.update
.name
, dest
.len
+ 1);
910 memcpy(r
->value
.update
.name
, dest
.buf
, dest
.len
);
911 r
->value
.update
.name
[dest
.len
] = 0;
914 n
= decode_string(&dest
, in
);
917 string_view_consume(&in
, n
);
919 r
->value
.update
.email
=
920 reftable_realloc(r
->value
.update
.email
, dest
.len
+ 1);
921 memcpy(r
->value
.update
.email
, dest
.buf
, dest
.len
);
922 r
->value
.update
.email
[dest
.len
] = 0;
925 n
= get_var_int(&ts
, &in
);
928 string_view_consume(&in
, n
);
929 r
->value
.update
.time
= ts
;
933 r
->value
.update
.tz_offset
= get_be16(in
.buf
);
934 string_view_consume(&in
, 2);
937 n
= decode_string(&dest
, in
);
940 string_view_consume(&in
, n
);
942 r
->value
.update
.message
=
943 reftable_realloc(r
->value
.update
.message
, dest
.len
+ 1);
944 memcpy(r
->value
.update
.message
, dest
.buf
, dest
.len
);
945 r
->value
.update
.message
[dest
.len
] = 0;
947 strbuf_release(&dest
);
948 return start
.len
- in
.len
;
951 strbuf_release(&dest
);
952 return REFTABLE_FORMAT_ERROR
;
955 static int null_streq(char *a
, char *b
)
964 return 0 == strcmp(a
, b
);
967 static int zero_hash_eq(uint8_t *a
, uint8_t *b
, int sz
)
975 return !memcmp(a
, b
, sz
);
978 static int reftable_log_record_equal_void(const void *a
,
979 const void *b
, int hash_size
)
981 return reftable_log_record_equal((struct reftable_log_record
*) a
,
982 (struct reftable_log_record
*) b
,
986 static int reftable_log_record_cmp_void(const void *_a
, const void *_b
)
988 const struct reftable_log_record
*a
= _a
;
989 const struct reftable_log_record
*b
= _b
;
990 int cmp
= strcmp(a
->refname
, b
->refname
);
995 * Note that the comparison here is reversed. This is because the
996 * update index is reversed when comparing keys. For reference, see how
997 * we handle this in reftable_log_record_key()`.
999 return b
->update_index
- a
->update_index
;
1002 int reftable_log_record_equal(const struct reftable_log_record
*a
,
1003 const struct reftable_log_record
*b
, int hash_size
)
1005 if (!(null_streq(a
->refname
, b
->refname
) &&
1006 a
->update_index
== b
->update_index
&&
1007 a
->value_type
== b
->value_type
))
1010 switch (a
->value_type
) {
1011 case REFTABLE_LOG_DELETION
:
1013 case REFTABLE_LOG_UPDATE
:
1014 return null_streq(a
->value
.update
.name
, b
->value
.update
.name
) &&
1015 a
->value
.update
.time
== b
->value
.update
.time
&&
1016 a
->value
.update
.tz_offset
== b
->value
.update
.tz_offset
&&
1017 null_streq(a
->value
.update
.email
,
1018 b
->value
.update
.email
) &&
1019 null_streq(a
->value
.update
.message
,
1020 b
->value
.update
.message
) &&
1021 zero_hash_eq(a
->value
.update
.old_hash
,
1022 b
->value
.update
.old_hash
, hash_size
) &&
1023 zero_hash_eq(a
->value
.update
.new_hash
,
1024 b
->value
.update
.new_hash
, hash_size
);
1030 static int reftable_log_record_is_deletion_void(const void *p
)
1032 return reftable_log_record_is_deletion(
1033 (const struct reftable_log_record
*)p
);
1036 static void reftable_log_record_print_void(const void *rec
, int hash_size
)
1038 reftable_log_record_print_sz((struct reftable_log_record
*)rec
, hash_size
);
1041 static struct reftable_record_vtable reftable_log_record_vtable
= {
1042 .key
= &reftable_log_record_key
,
1043 .type
= BLOCK_TYPE_LOG
,
1044 .copy_from
= &reftable_log_record_copy_from
,
1045 .val_type
= &reftable_log_record_val_type
,
1046 .encode
= &reftable_log_record_encode
,
1047 .decode
= &reftable_log_record_decode
,
1048 .release
= &reftable_log_record_release_void
,
1049 .is_deletion
= &reftable_log_record_is_deletion_void
,
1050 .equal
= &reftable_log_record_equal_void
,
1051 .cmp
= &reftable_log_record_cmp_void
,
1052 .print
= &reftable_log_record_print_void
,
1055 static void reftable_index_record_key(const void *r
, struct strbuf
*dest
)
1057 const struct reftable_index_record
*rec
= r
;
1059 strbuf_addbuf(dest
, &rec
->last_key
);
1062 static void reftable_index_record_copy_from(void *rec
, const void *src_rec
,
1065 struct reftable_index_record
*dst
= rec
;
1066 const struct reftable_index_record
*src
= src_rec
;
1068 strbuf_reset(&dst
->last_key
);
1069 strbuf_addbuf(&dst
->last_key
, &src
->last_key
);
1070 dst
->offset
= src
->offset
;
1073 static void reftable_index_record_release(void *rec
)
1075 struct reftable_index_record
*idx
= rec
;
1076 strbuf_release(&idx
->last_key
);
1079 static uint8_t reftable_index_record_val_type(const void *rec
)
1084 static int reftable_index_record_encode(const void *rec
, struct string_view out
,
1087 const struct reftable_index_record
*r
=
1088 (const struct reftable_index_record
*)rec
;
1089 struct string_view start
= out
;
1091 int n
= put_var_int(&out
, r
->offset
);
1095 string_view_consume(&out
, n
);
1097 return start
.len
- out
.len
;
1100 static int reftable_index_record_decode(void *rec
, struct strbuf key
,
1101 uint8_t val_type
, struct string_view in
,
1104 struct string_view start
= in
;
1105 struct reftable_index_record
*r
= rec
;
1108 strbuf_reset(&r
->last_key
);
1109 strbuf_addbuf(&r
->last_key
, &key
);
1111 n
= get_var_int(&r
->offset
, &in
);
1115 string_view_consume(&in
, n
);
1116 return start
.len
- in
.len
;
1119 static int reftable_index_record_equal(const void *a
, const void *b
, int hash_size
)
1121 struct reftable_index_record
*ia
= (struct reftable_index_record
*) a
;
1122 struct reftable_index_record
*ib
= (struct reftable_index_record
*) b
;
1124 return ia
->offset
== ib
->offset
&& !strbuf_cmp(&ia
->last_key
, &ib
->last_key
);
1127 static int reftable_index_record_cmp(const void *_a
, const void *_b
)
1129 const struct reftable_index_record
*a
= _a
;
1130 const struct reftable_index_record
*b
= _b
;
1131 return strbuf_cmp(&a
->last_key
, &b
->last_key
);
1134 static void reftable_index_record_print(const void *rec
, int hash_size
)
1136 const struct reftable_index_record
*idx
= rec
;
1137 /* TODO: escape null chars? */
1138 printf("\"%s\" %" PRIu64
"\n", idx
->last_key
.buf
, idx
->offset
);
1141 static struct reftable_record_vtable reftable_index_record_vtable
= {
1142 .key
= &reftable_index_record_key
,
1143 .type
= BLOCK_TYPE_INDEX
,
1144 .copy_from
= &reftable_index_record_copy_from
,
1145 .val_type
= &reftable_index_record_val_type
,
1146 .encode
= &reftable_index_record_encode
,
1147 .decode
= &reftable_index_record_decode
,
1148 .release
= &reftable_index_record_release
,
1149 .is_deletion
= ¬_a_deletion
,
1150 .equal
= &reftable_index_record_equal
,
1151 .cmp
= &reftable_index_record_cmp
,
1152 .print
= &reftable_index_record_print
,
1155 void reftable_record_key(struct reftable_record
*rec
, struct strbuf
*dest
)
1157 reftable_record_vtable(rec
)->key(reftable_record_data(rec
), dest
);
1160 uint8_t reftable_record_type(struct reftable_record
*rec
)
1165 int reftable_record_encode(struct reftable_record
*rec
, struct string_view dest
,
1168 return reftable_record_vtable(rec
)->encode(reftable_record_data(rec
),
1172 void reftable_record_copy_from(struct reftable_record
*rec
,
1173 struct reftable_record
*src
, int hash_size
)
1175 assert(src
->type
== rec
->type
);
1177 reftable_record_vtable(rec
)->copy_from(reftable_record_data(rec
),
1178 reftable_record_data(src
),
1182 uint8_t reftable_record_val_type(struct reftable_record
*rec
)
1184 return reftable_record_vtable(rec
)->val_type(reftable_record_data(rec
));
1187 int reftable_record_decode(struct reftable_record
*rec
, struct strbuf key
,
1188 uint8_t extra
, struct string_view src
, int hash_size
)
1190 return reftable_record_vtable(rec
)->decode(reftable_record_data(rec
),
1191 key
, extra
, src
, hash_size
);
1194 void reftable_record_release(struct reftable_record
*rec
)
1196 reftable_record_vtable(rec
)->release(reftable_record_data(rec
));
1199 int reftable_record_is_deletion(struct reftable_record
*rec
)
1201 return reftable_record_vtable(rec
)->is_deletion(
1202 reftable_record_data(rec
));
1205 int reftable_record_cmp(struct reftable_record
*a
, struct reftable_record
*b
)
1207 if (a
->type
!= b
->type
)
1208 BUG("cannot compare reftable records of different type");
1209 return reftable_record_vtable(a
)->cmp(
1210 reftable_record_data(a
), reftable_record_data(b
));
1213 int reftable_record_equal(struct reftable_record
*a
, struct reftable_record
*b
, int hash_size
)
1215 if (a
->type
!= b
->type
)
1217 return reftable_record_vtable(a
)->equal(
1218 reftable_record_data(a
), reftable_record_data(b
), hash_size
);
1221 static int hash_equal(const unsigned char *a
, const unsigned char *b
, int hash_size
)
1224 return !memcmp(a
, b
, hash_size
);
1229 int reftable_ref_record_equal(const struct reftable_ref_record
*a
,
1230 const struct reftable_ref_record
*b
, int hash_size
)
1232 assert(hash_size
> 0);
1233 if (!null_streq(a
->refname
, b
->refname
))
1236 if (a
->update_index
!= b
->update_index
||
1237 a
->value_type
!= b
->value_type
)
1240 switch (a
->value_type
) {
1241 case REFTABLE_REF_SYMREF
:
1242 return !strcmp(a
->value
.symref
, b
->value
.symref
);
1243 case REFTABLE_REF_VAL2
:
1244 return hash_equal(a
->value
.val2
.value
, b
->value
.val2
.value
,
1246 hash_equal(a
->value
.val2
.target_value
,
1247 b
->value
.val2
.target_value
, hash_size
);
1248 case REFTABLE_REF_VAL1
:
1249 return hash_equal(a
->value
.val1
, b
->value
.val1
, hash_size
);
1250 case REFTABLE_REF_DELETION
:
1257 int reftable_ref_record_compare_name(const void *a
, const void *b
)
1259 return strcmp(((struct reftable_ref_record
*)a
)->refname
,
1260 ((struct reftable_ref_record
*)b
)->refname
);
1263 int reftable_ref_record_is_deletion(const struct reftable_ref_record
*ref
)
1265 return ref
->value_type
== REFTABLE_REF_DELETION
;
1268 int reftable_log_record_compare_key(const void *a
, const void *b
)
1270 const struct reftable_log_record
*la
= a
;
1271 const struct reftable_log_record
*lb
= b
;
1273 int cmp
= strcmp(la
->refname
, lb
->refname
);
1276 if (la
->update_index
> lb
->update_index
)
1278 return (la
->update_index
< lb
->update_index
) ? 1 : 0;
1281 int reftable_log_record_is_deletion(const struct reftable_log_record
*log
)
1283 return (log
->value_type
== REFTABLE_LOG_DELETION
);
1286 void string_view_consume(struct string_view
*s
, int n
)
1292 static void *reftable_record_data(struct reftable_record
*rec
)
1294 switch (rec
->type
) {
1295 case BLOCK_TYPE_REF
:
1297 case BLOCK_TYPE_LOG
:
1299 case BLOCK_TYPE_INDEX
:
1301 case BLOCK_TYPE_OBJ
:
1307 static struct reftable_record_vtable
*
1308 reftable_record_vtable(struct reftable_record
*rec
)
1310 switch (rec
->type
) {
1311 case BLOCK_TYPE_REF
:
1312 return &reftable_ref_record_vtable
;
1313 case BLOCK_TYPE_LOG
:
1314 return &reftable_log_record_vtable
;
1315 case BLOCK_TYPE_INDEX
:
1316 return &reftable_index_record_vtable
;
1317 case BLOCK_TYPE_OBJ
:
1318 return &reftable_obj_record_vtable
;
1323 void reftable_record_init(struct reftable_record
*rec
, uint8_t typ
)
1325 memset(rec
, 0, sizeof(*rec
));
1329 case BLOCK_TYPE_REF
:
1330 case BLOCK_TYPE_LOG
:
1331 case BLOCK_TYPE_OBJ
:
1333 case BLOCK_TYPE_INDEX
:
1334 strbuf_init(&rec
->u
.idx
.last_key
, 0);
1337 BUG("unhandled record type");
1341 void reftable_record_print(struct reftable_record
*rec
, int hash_size
)
1343 printf("'%c': ", rec
->type
);
1344 reftable_record_vtable(rec
)->print(reftable_record_data(rec
), hash_size
);