diff options
Diffstat (limited to 'src/include/utils/pg_lzcompress.h')
| -rw-r--r-- | src/include/utils/pg_lzcompress.h | 76 |
1 files changed, 39 insertions, 37 deletions
diff --git a/src/include/utils/pg_lzcompress.h b/src/include/utils/pg_lzcompress.h index db9618fd40e..fd1e62a8bed 100644 --- a/src/include/utils/pg_lzcompress.h +++ b/src/include/utils/pg_lzcompress.h @@ -1,7 +1,7 @@ /* ---------- * pg_lzcompress.h - * - * $Header: /cvsroot/pgsql/src/include/utils/pg_lzcompress.h,v 1.4 2000/01/05 18:23:52 momjian Exp $ + * $Header: /cvsroot/pgsql/src/include/utils/pg_lzcompress.h,v 1.5 2000/04/12 17:16:55 momjian Exp $ * * Definitions for the builtin LZ compressor * ---------- @@ -14,14 +14,15 @@ /* ---------- * PGLZ_Header - * - * The information at the top of the compressed data. + * The information at the top of the compressed data. * The varsize must be kept the same data type as the value * in front of all variable size data types in PostgreSQL. * ---------- */ -typedef struct PGLZ_Header { - int32 varsize; - int32 rawsize; +typedef struct PGLZ_Header +{ + int32 varsize; + int32 rawsize; } PGLZ_Header; @@ -54,9 +55,9 @@ typedef struct PGLZ_Header { * uncompressed data. * ---------- */ -#define PGLZ_IS_COMPRESSED(_lzdata) (_lzdata->varsize != \ - _lzdata->rawsize + \ - sizeof(PGLZ_Header)) +#define PGLZ_IS_COMPRESSED(_lzdata) (_lzdata->varsize != \ + _lzdata->rawsize + \ + sizeof(PGLZ_Header)) /* ---------- * PGLZ_RAW_DATA - @@ -65,7 +66,7 @@ typedef struct PGLZ_Header { * data. Useful if PGLZ_IS_COMPRESSED returns false. * ---------- */ -#define PGLZ_RAW_DATA(_lzdata) (((char *)(_lzdata)) + \ +#define PGLZ_RAW_DATA(_lzdata) (((char *)(_lzdata)) + \ sizeof(PGLZ_Header)) /* ---------- @@ -89,7 +90,7 @@ typedef struct PGLZ_Header { * lookup. When looking up the history to find a * match that could be expressed as a tag, the * algorithm does not allways walk back entirely. - * A good match fast is usually better than the + * 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 @@ -101,7 +102,8 @@ typedef struct PGLZ_Header { * latest history entry at all). * ---------- */ -typedef struct PGLZ_Strategy { +typedef struct PGLZ_Strategy +{ int32 min_input_size; int32 force_input_size; int32 min_comp_rate; @@ -117,16 +119,17 @@ typedef struct PGLZ_Strategy { * using pglz_decomp_getchar() macro. * ---------- */ -typedef struct PGLZ_DecompState { - unsigned char *temp_buf; - unsigned char *cp_in; - unsigned char *cp_end; - unsigned char *cp_out; - unsigned char *cp_copy; - int (*next_char)(struct PGLZ_DecompState *dstate); - int tocopy; - int ctrl_count; - unsigned char ctrl; +typedef struct PGLZ_DecompState +{ + unsigned char *temp_buf; + unsigned char *cp_in; + unsigned char *cp_end; + unsigned char *cp_out; + unsigned char *cp_copy; + int (*next_char) (struct PGLZ_DecompState *dstate); + int tocopy; + int ctrl_count; + unsigned char ctrl; } PGLZ_DecompState; @@ -154,9 +157,9 @@ typedef struct PGLZ_DecompState { * for generic interfacing. * ---------- */ -extern PGLZ_Strategy *PGLZ_strategy_default; -extern PGLZ_Strategy *PGLZ_strategy_allways; -extern PGLZ_Strategy *PGLZ_strategy_never; +extern PGLZ_Strategy *PGLZ_strategy_default; +extern PGLZ_Strategy *PGLZ_strategy_allways; +extern PGLZ_Strategy *PGLZ_strategy_never; /* ---------- @@ -177,10 +180,10 @@ extern PGLZ_Strategy *PGLZ_strategy_never; * Initialize a decomp state from a compressed input. * ---------- */ -#define pglz_decomp_init(_ds,_lz) { \ - (_ds)->cp_in = ((unsigned char *)(_lz)) \ +#define pglz_decomp_init(_ds,_lz) do { \ + (_ds)->cp_in = ((unsigned char *)(_lz)) \ + sizeof(PGLZ_Header); \ - (_ds)->cp_end = (_ds)->cp_in + (_lz)->varsize \ + (_ds)->cp_end = (_ds)->cp_in + (_lz)->varsize \ - sizeof(PGLZ_Header); \ if (PGLZ_IS_COMPRESSED((_lz))) { \ (_ds)->temp_buf = (unsigned char *) \ @@ -193,7 +196,7 @@ extern PGLZ_Strategy *PGLZ_strategy_never; (_ds)->temp_buf = NULL; \ (_ds)->next_char = pglz_get_next_decomp_char_from_plain; \ } \ - } + } while (0) /* ---------- @@ -202,19 +205,19 @@ extern PGLZ_Strategy *PGLZ_strategy_never; * Deallocate resources after decompression. * ---------- */ -#define pglz_decomp_end(_ds) { \ +#define pglz_decomp_end(_ds) do { \ if ((_ds)->temp_buf != NULL) \ pfree((void *)((_ds)->temp_buf)); \ - } + } while (0) /* ---------- * Global function declarations * ---------- */ -int pglz_compress (char *source, int32 slen, PGLZ_Header *dest, - PGLZ_Strategy *strategy); -int pglz_decompress (PGLZ_Header *source, char *dest); +int pglz_compress(char *source, int32 slen, PGLZ_Header *dest, + PGLZ_Strategy *strategy); +int pglz_decompress(PGLZ_Header *source, char *dest); /* ---------- @@ -222,8 +225,7 @@ int pglz_decompress (PGLZ_Header *source, char *dest); * Internal use only. * ---------- */ -extern int pglz_get_next_decomp_char_from_lzdata(PGLZ_DecompState *dstate); -extern int pglz_get_next_decomp_char_from_plain(PGLZ_DecompState *dstate); - -#endif /* _PG_LZCOMPRESS_H_ */ +extern int pglz_get_next_decomp_char_from_lzdata(PGLZ_DecompState *dstate); +extern int pglz_get_next_decomp_char_from_plain(PGLZ_DecompState *dstate); +#endif /* _PG_LZCOMPRESS_H_ */ |