PostgreSQL Source Code: src/include/common/compression.h Source File

PostgreSQL Source Code git master
compression.h
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1/*-------------------------------------------------------------------------
2 *
3 * compression.h
4 *
5 * Shared definitions for compression methods and specifications.
6 *
7 * Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
8 *
9 * IDENTIFICATION
10 * src/include/common/compression.h
11 *-------------------------------------------------------------------------
12 */
13
14#ifndef PG_COMPRESSION_H
15#define PG_COMPRESSION_H
16
17/*
18 * These values are stored in disk, for example in files generated by pg_dump.
19 * Create the necessary backwards compatibility layers if their order changes.
20 */
21 typedef enum pg_compress_algorithm
22{
23 PG_COMPRESSION_NONE,
24 PG_COMPRESSION_GZIP,
25 PG_COMPRESSION_LZ4,
26 PG_COMPRESSION_ZSTD,
27 } pg_compress_algorithm;
28
29 #define PG_COMPRESSION_OPTION_WORKERS (1 << 0)
30 #define PG_COMPRESSION_OPTION_LONG_DISTANCE (1 << 1)
31
32 typedef struct pg_compress_specification
33{
34 pg_compress_algorithm algorithm;
35 unsigned options; /* OR of PG_COMPRESSION_OPTION constants */
36 int level;
37 int workers;
38 bool long_distance;
39 char *parse_error; /* NULL if parsing was OK, else message */
40 } pg_compress_specification;
41
42 extern void parse_compress_options(const char *option, char **algorithm,
43 char **detail);
44extern bool parse_compress_algorithm(char *name, pg_compress_algorithm *algorithm);
45extern const char *get_compress_algorithm_name(pg_compress_algorithm algorithm);
46
47extern void parse_compress_specification(pg_compress_algorithm algorithm,
48 char *specification,
49 pg_compress_specification *result);
50
51extern char *validate_compress_specification(pg_compress_specification *);
52
53#endif
struct pg_compress_specification pg_compress_specification
const char * get_compress_algorithm_name(pg_compress_algorithm algorithm)
Definition: compression.c:69
pg_compress_algorithm
Definition: compression.h:22
@ PG_COMPRESSION_GZIP
Definition: compression.h:24
@ PG_COMPRESSION_LZ4
Definition: compression.h:25
@ PG_COMPRESSION_NONE
Definition: compression.h:23
@ PG_COMPRESSION_ZSTD
Definition: compression.h:26
bool parse_compress_algorithm(char *name, pg_compress_algorithm *algorithm)
Definition: compression.c:49
char * validate_compress_specification(pg_compress_specification *)
Definition: compression.c:344
void parse_compress_options(const char *option, char **algorithm, char **detail)
void parse_compress_specification(pg_compress_algorithm algorithm, char *specification, pg_compress_specification *result)
Definition: compression.c:107
Definition: compression.h:33
char * parse_error
Definition: compression.h:39
int level
Definition: compression.h:36
pg_compress_algorithm algorithm
Definition: compression.h:34
unsigned options
Definition: compression.h:35
int workers
Definition: compression.h:37
bool long_distance
Definition: compression.h:38
const char * name

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