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Diffstat (limited to 'include/nisam.h')
| -rw-r--r-- | include/nisam.h | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/include/nisam.h b/include/nisam.h new file mode 100644 index 00000000000..77ca12bbc5c --- /dev/null +++ b/include/nisam.h @@ -0,0 +1,213 @@ +/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; either + version 2 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, + MA 02111-1307, USA */ + +/* This file should be included when using nisam_funktions */ +/* Author: Michael Widenius */ + +#ifndef _nisam_h +#define _nisam_h +#ifdef __cplusplus +extern "C" { +#endif + +#ifndef _my_base_h +#include <my_base.h> +#endif + /* defines used by nisam-funktions */ + +#define N_MAXKEY 16 /* Max allowed keys */ +#define N_MAXKEY_SEG 16 /* Max segments for key */ +#define N_MAX_KEY_LENGTH 256 /* May be increased up to 500 */ +#define N_MAX_KEY_BUFF (N_MAX_KEY_LENGTH+N_MAXKEY_SEG+sizeof(double)-1) +#define N_MAX_POSSIBLE_KEY_BUFF 500+9 + +#define N_NAME_IEXT ".ISM" +#define N_NAME_DEXT ".ISD" +#define NI_POS_ERROR (~ (ulong) 0) + + + /* Param to/from nisam_info */ + +typedef struct st_n_isaminfo /* Struct from h_info */ +{ + ulong records; /* Records in database */ + ulong deleted; /* Deleted records in database */ + ulong recpos; /* Pos for last used record */ + ulong newrecpos; /* Pos if we write new record */ + ulong dupp_key_pos; /* Position to record with dupp key */ + ulong data_file_length, /* Length of data file */ + max_data_file_length, + index_file_length, + max_index_file_length, + delete_length; + uint reclength; /* Recordlength */ + uint mean_reclength; /* Mean recordlength (if packed) */ + uint keys; /* How many keys used */ + uint options; /* HA_OPTIONS_... used */ + int errkey, /* With key was dupplicated on err */ + sortkey; /* clustered by this key */ + File filenr; /* (uniq) filenr for datafile */ + time_t create_time; /* When table was created */ + time_t isamchk_time; + time_t update_time; + ulong *rec_per_key; /* for sql optimizing */ +} N_ISAMINFO; + + + /* Info saved on file for each info-part */ + +#ifdef __WATCOMC__ +#pragma pack(2) +#define uint uint16 /* Same format as in MSDOS */ +#endif + +#ifdef __ZTC__ +#pragma ZTC align 2 +#define uint uint16 /* Same format as in MSDOS */ +#endif + +typedef struct st_n_save_keyseg /* Key-portion */ +{ + uint8 type; /* Typ av nyckel (f|r sort) */ + uint8 flag; /* HA_DIFF_LENGTH */ + uint16 start; /* Start of key in record */ + uint16 length; /* Keylength */ +} N_SAVE_KEYSEG; + +typedef struct st_n_save_keydef /* Key definition with create & info */ +{ + uint8 flag; /* NOSAME, PACK_USED */ + uint8 keysegs; /* Number of key-segment */ + uint16 block_length; /* Length of keyblock (auto) */ + uint16 keylength; /* Tot length of keyparts (auto) */ + uint16 minlength; /* min length of (packed) key (auto) */ + uint16 maxlength; /* max length of (packed) key (auto) */ +} N_SAVE_KEYDEF; + +typedef struct st_n_save_recinfo /* Info of record */ +{ + int16 type; /* en_fieldtype */ + uint16 length; /* length of field */ +} N_SAVE_RECINFO; + + +#ifdef __ZTC__ +#pragma ZTC align +#undef uint +#endif + +#ifdef __WATCOMC__ +#pragma pack() +#undef uint +#endif + + +struct st_isam_info; /* For referense */ + +#ifndef ISAM_LIBRARY +typedef struct st_isam_info N_INFO; +#endif + +typedef struct st_n_keyseg /* Key-portion */ +{ + N_SAVE_KEYSEG base; +} N_KEYSEG; + + +typedef struct st_n_keydef /* Key definition with open & info */ +{ + N_SAVE_KEYDEF base; + N_KEYSEG seg[N_MAXKEY_SEG+1]; + int (*bin_search)(struct st_isam_info *info,struct st_n_keydef *keyinfo, + uchar *page,uchar *key, + uint key_len,uint comp_flag,uchar * *ret_pos, + uchar *buff); + uint (*get_key)(struct st_n_keydef *keyinfo,uint nod_flag,uchar * *page, + uchar *key); +} N_KEYDEF; + + +typedef struct st_decode_tree /* Decode huff-table */ +{ + uint16 *table; + uint quick_table_bits; + byte *intervalls; +} DECODE_TREE; + + +struct st_bit_buff; + +typedef struct st_n_recinfo /* Info of record */ +{ + N_SAVE_RECINFO base; +#ifndef NOT_PACKED_DATABASES + void (*unpack)(struct st_n_recinfo *rec,struct st_bit_buff *buff, + uchar *start,uchar *end); + enum en_fieldtype base_type; + uint space_length_bits,pack_type; + DECODE_TREE *huff_tree; +#endif +} N_RECINFO; + + +extern my_string nisam_log_filename; /* Name of logfile */ +extern uint nisam_block_size; +extern my_bool nisam_flush; + + /* Prototypes for nisam-functions */ + +extern int nisam_close(struct st_isam_info *file); +extern int nisam_delete(struct st_isam_info *file,const byte *buff); +extern struct st_isam_info *nisam_open(const char *name,int mode, + uint wait_if_locked); +extern int nisam_panic(enum ha_panic_function function); +extern int nisam_rfirst(struct st_isam_info *file,byte *buf,int inx); +extern int nisam_rkey(struct st_isam_info *file,byte *buf,int inx, + const byte *key, + uint key_len, enum ha_rkey_function search_flag); +extern int nisam_rlast(struct st_isam_info *file,byte *buf,int inx); +extern int nisam_rnext(struct st_isam_info *file,byte *buf,int inx); +extern int nisam_rprev(struct st_isam_info *file,byte *buf,int inx); +extern int nisam_rrnd(struct st_isam_info *file,byte *buf,ulong pos); +extern int nisam_rsame(struct st_isam_info *file,byte *record,int inx); +extern int nisam_rsame_with_pos(struct st_isam_info *file,byte *record, + int inx,ulong pos); +extern int nisam_update(struct st_isam_info *file,const byte *old, + const byte *new_record); +extern int nisam_write(struct st_isam_info *file,const byte *buff); +extern int nisam_info(struct st_isam_info *file,N_ISAMINFO *x,int flag); +extern ulong nisam_position(struct st_isam_info *info); +extern int nisam_lock_database(struct st_isam_info *file,int lock_type); +extern int nisam_create(const char *name,uint keys,N_KEYDEF *keyinfo, + N_RECINFO *recinfo,ulong records, + ulong reloc,uint flags,uint options, + ulong data_file_length); +extern int nisam_extra(struct st_isam_info *file, + enum ha_extra_function function); +extern ulong nisam_records_in_range(struct st_isam_info *info,int inx, + const byte *start_key,uint start_key_len, + enum ha_rkey_function start_search_flag, + const byte *end_key,uint end_key_len, + enum ha_rkey_function end_search_flag); +extern int nisam_log(int activate_log); +extern int nisam_is_changed(struct st_isam_info *info); +extern uint _calc_blob_length(uint length , const byte *pos); + +#ifdef __cplusplus +} +#endif +#endif |