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/*-------------------------------------------------------------------------
*
* compression.h
*
* Shared definitions for compression methods and specifications.
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/include/common/compression.h
*-------------------------------------------------------------------------
*/
#ifndef PG_COMPRESSION_H
#define PG_COMPRESSION_H
/*
* These values are stored in disk, for example in files generated by pg_dump.
* Create the necessary backwards compatibility layers if their order changes.
*/
typedef enum pg_compress_algorithm
{
PG_COMPRESSION_NONE,
PG_COMPRESSION_GZIP,
PG_COMPRESSION_LZ4,
PG_COMPRESSION_ZSTD,
} pg_compress_algorithm;
#define PG_COMPRESSION_OPTION_WORKERS (1 << 0)
#define PG_COMPRESSION_OPTION_LONG_DISTANCE (1 << 1)
typedef struct pg_compress_specification
{
pg_compress_algorithm algorithm;
unsigned options; /* OR of PG_COMPRESSION_OPTION constants */
int level;
int workers;
bool long_distance;
char *parse_error; /* NULL if parsing was OK, else message */
} pg_compress_specification;
extern void parse_compress_options(const char *option, char **algorithm,
char **detail);
extern bool parse_compress_algorithm(char *name, pg_compress_algorithm *algorithm);
extern const char *get_compress_algorithm_name(pg_compress_algorithm algorithm);
extern void parse_compress_specification(pg_compress_algorithm algorithm,
char *specification,
pg_compress_specification *result);
extern char *validate_compress_specification(pg_compress_specification *);
#endif
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