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-rw-r--r--reftable/record.h49
1 files changed, 37 insertions, 12 deletions
diff --git a/reftable/record.h b/reftable/record.h
index fd80cd4..d778133 100644
--- a/reftable/record.h
+++ b/reftable/record.h
@@ -25,7 +25,11 @@ struct string_view {
};
/* Advance `s.buf` by `n`, and decrease length. */
-void string_view_consume(struct string_view *s, int n);
+static inline void string_view_consume(struct string_view *s, int n)
+{
+ s->buf += n;
+ s->len -= n;
+}
/* utilities for de/encoding varints */
@@ -51,7 +55,8 @@ struct reftable_record_vtable {
/* decode data from `src` into the record. */
int (*decode)(void *rec, struct strbuf key, uint8_t extra,
- struct string_view src, int hash_size);
+ struct string_view src, int hash_size,
+ struct strbuf *scratch);
/* deallocate and null the record. */
void (*release)(void *rec);
@@ -62,6 +67,12 @@ struct reftable_record_vtable {
/* Are two records equal? This assumes they have the same type. Returns 0 for non-equal. */
int (*equal)(const void *a, const void *b, int hash_size);
+ /*
+ * Compare keys of two records with each other. The records must have
+ * the same type.
+ */
+ int (*cmp)(const void *a, const void *b);
+
/* Print on stdout, for debugging. */
void (*print)(const void *rec, int hash_size);
};
@@ -69,18 +80,24 @@ struct reftable_record_vtable {
/* returns true for recognized block types. Block start with the block type. */
int reftable_is_block_type(uint8_t typ);
-/* return an initialized record for the given type */
-struct reftable_record reftable_new_record(uint8_t typ);
-
/* Encode `key` into `dest`. Sets `is_restart` to indicate a restart. Returns
* number of bytes written. */
int reftable_encode_key(int *is_restart, struct string_view dest,
struct strbuf prev_key, struct strbuf key,
uint8_t extra);
-/* Decode into `key` and `extra` from `in` */
-int reftable_decode_key(struct strbuf *key, uint8_t *extra,
- struct strbuf last_key, struct string_view in);
+/* Decode a record's key lengths. */
+int reftable_decode_keylen(struct string_view in,
+ uint64_t *prefix_len,
+ uint64_t *suffix_len,
+ uint8_t *extra);
+
+/*
+ * Decode into `last_key` and `extra` from `in`. `last_key` is expected to
+ * contain the decoded key of the preceding record, if any.
+ */
+int reftable_decode_key(struct strbuf *last_key, uint8_t *extra,
+ struct string_view in);
/* reftable_index_record are used internally to speed up lookups. */
struct reftable_index_record {
@@ -100,8 +117,8 @@ struct reftable_obj_record {
/* record is a generic wrapper for different types of records. It is normally
* created on the stack, or embedded within another struct. If the type is
* known, a fresh instance can be initialized explicitly. Otherwise, use
- * reftable_new_record() to initialize generically (as the index_record is not
- * valid as 0-initialized structure)
+ * `reftable_record_init()` to initialize generically (as the index_record is
+ * not valid as 0-initialized structure)
*/
struct reftable_record {
uint8_t type;
@@ -113,11 +130,14 @@ struct reftable_record {
} u;
};
+/* Initialize the reftable record for the given type */
+void reftable_record_init(struct reftable_record *rec, uint8_t typ);
+
/* see struct record_vtable */
+int reftable_record_cmp(struct reftable_record *a, struct reftable_record *b);
int reftable_record_equal(struct reftable_record *a, struct reftable_record *b, int hash_size);
void reftable_record_print(struct reftable_record *rec, int hash_size);
void reftable_record_key(struct reftable_record *rec, struct strbuf *dest);
-uint8_t reftable_record_type(struct reftable_record *rec);
void reftable_record_copy_from(struct reftable_record *rec,
struct reftable_record *src, int hash_size);
uint8_t reftable_record_val_type(struct reftable_record *rec);
@@ -125,9 +145,14 @@ int reftable_record_encode(struct reftable_record *rec, struct string_view dest,
int hash_size);
int reftable_record_decode(struct reftable_record *rec, struct strbuf key,
uint8_t extra, struct string_view src,
- int hash_size);
+ int hash_size, struct strbuf *scratch);
int reftable_record_is_deletion(struct reftable_record *rec);
+static inline uint8_t reftable_record_type(struct reftable_record *rec)
+{
+ return rec->type;
+}
+
/* frees and zeroes out the embedded record */
void reftable_record_release(struct reftable_record *rec);