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..
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config_info.h
(427 B)
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controldata_utils.h
(490 B)
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fe_memutils.h
(1.52 KB)
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int128.h
(6.39 KB)
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keywords.h
(1.13 KB)
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pg_lzcompress.h
(2.56 KB)
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relpath.h
(2.09 KB)
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restricted_token.h
(745 B)
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string.h
(373 B)
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username.h
(333 B)
Editing: pg_lzcompress.h
/* ---------- * pg_lzcompress.h - * * Definitions for the builtin LZ compressor * * src/include/common/pg_lzcompress.h * ---------- */ #ifndef _PG_LZCOMPRESS_H_ #define _PG_LZCOMPRESS_H_ /* ---------- * PGLZ_MAX_OUTPUT - * * Macro to compute the buffer size required by pglz_compress(). * We allow 4 bytes for overrun before detecting compression failure. * ---------- */ #define PGLZ_MAX_OUTPUT(_dlen) ((_dlen) + 4) /* ---------- * PGLZ_Strategy - * * Some values that control the compression algorithm. * * min_input_size Minimum input data size to consider compression. * * max_input_size Maximum input data size to consider compression. * * min_comp_rate Minimum compression rate (0-99%) to require. * Regardless of min_comp_rate, the output must be * smaller than the input, else we don't store * compressed. * * first_success_by Abandon compression if we find no compressible * data within the first this-many bytes. * * match_size_good The initial GOOD match size when starting history * lookup. When looking up the history to find a * match that could be expressed as a tag, the * algorithm does not always walk back entirely. * A good match fast is usually better than the * best possible one very late. For each iteration * in the lookup, this value is lowered so the * longer the lookup takes, the smaller matches * are considered good. * * match_size_drop The percentage by which match_size_good is lowered * after each history check. Allowed values are * 0 (no change until end) to 100 (only check * latest history entry at all). * ---------- */ typedef struct PGLZ_Strategy { int32 min_input_size; int32 max_input_size; int32 min_comp_rate; int32 first_success_by; int32 match_size_good; int32 match_size_drop; } PGLZ_Strategy; /* ---------- * The standard strategies * * PGLZ_strategy_default Recommended default strategy for TOAST. * * PGLZ_strategy_always Try to compress inputs of any length. * Fallback to uncompressed storage only if * output would be larger than input. * ---------- */ extern const PGLZ_Strategy *const PGLZ_strategy_default; extern const PGLZ_Strategy *const PGLZ_strategy_always; /* ---------- * Global function declarations * ---------- */ extern int32 pglz_compress(const char *source, int32 slen, char *dest, const PGLZ_Strategy *strategy); extern int32 pglz_decompress(const char *source, int32 slen, char *dest, int32 rawsize); #endif /* _PG_LZCOMPRESS_H_ */
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