/* Copyright (C) 1979-2002 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* Pack isam file */ #ifndef USE_MY_FUNC #define USE_MY_FUNC /* We nead at least my_malloc */ #endif #include "isamdef.h" #include #include #include "mysys_err.h" #ifdef MSDOS #include #endif #ifndef __GNU_LIBRARY__ #define __GNU_LIBRARY__ /* Skip warnings in getopt.h */ #endif #include #if INT_MAX > 32767 #define BITS_SAVED 32 #else #define BITS_SAVED 16 #endif #define IS_OFFSET ((uint) 32768) /* Bit if offset or char in tree */ #define HEAD_LENGTH 32 #define ALLOWED_JOIN_DIFF 256 /* Diff allowed to join trees */ #define DATA_TMP_EXT ".TMD" #define OLD_EXT ".OLD" #define WRITE_COUNT MY_HOW_OFTEN_TO_WRITE struct st_file_buffer { File file; char *buffer,*pos,*end; my_off_t pos_in_file; int bits; uint bytes; }; struct st_huff_tree; struct st_huff_element; typedef struct st_huff_counts { uint field_length,max_zero_fill; uint pack_type; uint max_end_space,max_pre_space,length_bits,min_space; enum en_fieldtype field_type; struct st_huff_tree *tree; /* Tree for field */ my_off_t counts[256]; my_off_t end_space[8]; my_off_t pre_space[8]; my_off_t tot_end_space,tot_pre_space,zero_fields,empty_fields,bytes_packed; TREE int_tree; byte *tree_buff; byte *tree_pos; } HUFF_COUNTS; typedef struct st_huff_element HUFF_ELEMENT; struct st_huff_element { my_off_t count; union un_element { struct st_nod { HUFF_ELEMENT *left,*right; } nod; struct st_leaf { HUFF_ELEMENT *null; uint element_nr; /* Number of element */ } leaf; } a; }; typedef struct st_huff_tree { HUFF_ELEMENT *root,*element_buffer; HUFF_COUNTS *counts; uint tree_number; uint elements; my_off_t bytes_packed; uint tree_pack_length; uint min_chr,max_chr,char_bits,offset_bits,max_offset,height; ulong *code; uchar *code_len; } HUFF_TREE; typedef struct st_isam_mrg { N_INFO **file,**current,**end; uint count; uint min_pack_length; /* Theese is used by packed data */ uint max_pack_length; uint ref_length; my_off_t records; } MRG_INFO; extern int main(int argc,char * *argv); static void get_options(int *argc,char ***argv); static N_INFO *open_isam_file(char *name,int mode); static bool open_isam_files(MRG_INFO *mrg,char **names,uint count); static int compress(MRG_INFO *file,char *join_name); static HUFF_COUNTS *init_huff_count(N_INFO *info,my_off_t records); static void free_counts_and_tree_and_queue(HUFF_TREE *huff_trees, uint trees, HUFF_COUNTS *huff_counts, uint fields); static int compare_tree(const uchar *s,const uchar *t); static int get_statistic(MRG_INFO *mrg,HUFF_COUNTS *huff_counts); static void check_counts(HUFF_COUNTS *huff_counts,uint trees, my_off_t records); static int test_space_compress(HUFF_COUNTS *huff_counts,my_off_t records, uint max_space_length,my_off_t *space_counts, my_off_t tot_space_count, enum en_fieldtype field_type); static HUFF_TREE* make_huff_trees(HUFF_COUNTS *huff_counts,uint trees); static int make_huff_tree(HUFF_TREE *tree,HUFF_COUNTS *huff_counts); static int compare_huff_elements(void *not_used, byte *a,byte *b); static int save_counts_in_queue(byte *key,element_count count, HUFF_TREE *tree); static my_off_t calc_packed_length(HUFF_COUNTS *huff_counts,uint flag); static uint join_same_trees(HUFF_COUNTS *huff_counts,uint trees); static int make_huff_decode_table(HUFF_TREE *huff_tree,uint trees); static void make_traverse_code_tree(HUFF_TREE *huff_tree, HUFF_ELEMENT *element,uint size, ulong code); static int write_header(MRG_INFO *isam_file, uint header_length,uint trees, my_off_t tot_elements,my_off_t filelength); static void write_field_info(HUFF_COUNTS *counts, uint fields,uint trees); static my_off_t write_huff_tree(HUFF_TREE *huff_tree,uint trees); static uint *make_offset_code_tree(HUFF_TREE *huff_tree, HUFF_ELEMENT *element, uint *offset); static uint max_bit(uint value); static int compress_isam_file(MRG_INFO *file,HUFF_COUNTS *huff_counts); static char *make_new_name(char *new_name,char *old_name); static char *make_old_name(char *new_name,char *old_name); static void init_file_buffer(File file,pbool read_buffer); static int flush_buffer(uint neaded_length); static void end_file_buffer(void); static void write_bits(ulong value,uint bits); static void flush_bits(void); static void save_integer(byte *pos,uint pack_length,my_off_t value); static void save_state(N_INFO *isam_file,MRG_INFO *mrg,my_off_t new_length, ulong crc); static int save_state_mrg(File file,MRG_INFO *isam_file,my_off_t new_length, ulong crc); static int mrg_close(MRG_INFO *mrg); static int mrg_rrnd(MRG_INFO *info,byte *buf); static void mrg_reset(MRG_INFO *mrg); static int error_on_write=0,test_only=0,verbose=0,silent=0, write_loop=0,force_pack=0,isamchk_neaded=0; static my_bool backup, opt_wait; static int tmpfile_createflag=O_RDWR | O_TRUNC | O_EXCL; static uint tree_buff_length=8196-MALLOC_OVERHEAD,force_pack_ref_length; static char tmp_dir[FN_REFLEN]={0},*join_table; static my_off_t intervall_length; static ulong crc; static struct st_file_buffer file_buffer; static QUEUE queue; static HUFF_COUNTS *global_count; static char zero_string[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; static const char *load_default_groups[]= { "pack_isam",0 }; /* The main program */ int main(int argc, char **argv) { int error,ok; MRG_INFO merge; MY_INIT(argv[0]); load_defaults("my",load_default_groups,&argc,&argv); get_options(&argc,&argv); error=ok=isamchk_neaded=0; if (join_table) { /* Join files into one */ if (open_isam_files(&merge,argv,(uint) argc) || compress(&merge,join_table)) error=1; } else while (argc--) { N_INFO *isam_file; if (!(isam_file=open_isam_file(*argv++,O_RDWR))) error=1; else { merge.file= &isam_file; merge.current=0; merge.count=1; if (compress(&merge,0)) error=1; else ok=1; } } if (ok && isamchk_neaded && !silent) puts("Remember to run isamchk -rq on compressed databases"); VOID(fflush(stdout)); VOID(fflush(stderr)); my_end(verbose ? MY_CHECK_ERROR | MY_GIVE_INFO : MY_CHECK_ERROR); exit(error ? 2 : 0); #ifndef _lint return 0; /* No compiler warning */ #endif } static struct my_option my_long_options[] = { {"backup", 'b', "Make a backup of the table as table_name.OLD", (gptr*) &backup, (gptr*) &backup, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0}, {"debug", '#', "Output debug log. Often this is 'd:t:o,filename'", 0, 0, 0, GET_STR, OPT_ARG, 0, 0, 0, 0, 0, 0}, {"force", 'f', "Force packing of table even if it's gets bigger or tempfile exists.", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}, {"join", 'j', "Join all given tables into 'new_table_name'. All tables MUST have the identical layout.", (gptr*) &join_table, (gptr*) &join_table, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0}, {"help", '?', "Display this help and exit.", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}, {"packlength", 'p', "Force storage size of recordlength (1, 2 or 3)", (gptr*) &force_pack_ref_length, (gptr*) &force_pack_ref_length, 0, GET_UINT, REQUIRED_ARG, 0, 0, 0, 0, 0, 0}, {"silent", 's', "Be more silent.", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0 ,0}, {"tmpdir", 'T', "Use temporary directory to store temporary table", (gptr*) &tmp_dir, (gptr*) &tmp_dir, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0}, {"test", 't', "Don't pack table, only test packing it", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0 ,0}, {"verbose", 'v', "Write info about progress and packing result", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0 ,0}, {"version", 'V', "output version information and exit", 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0 ,0}, {"wait", 'w', "Wait and retry if table is in use", (gptr*) &opt_wait, (gptr*) &opt_wait, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0}, { 0, 0, 0, 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0} }; static void print_version(void) { printf("%s Ver 5.10 for %s on %s\n", my_progname, SYSTEM_TYPE, MACHINE_TYPE); } static void usage(void) { print_version(); puts("Copyright (C) 2002 MySQL AB"); puts("This software comes with ABSOLUTELY NO WARRANTY. This is free software,"); puts("and you are welcome to modify and redistribute it under the GPL license\n"); puts("Pack a ISAM-table to take much smaller space"); puts("Keys are not updated, so you must run isamchk -rq on any table"); puts("that has keys after you have compressed it"); puts("You should give the .ISM file as the filename argument"); printf("\nUsage: %s [OPTIONS] filename...\n", my_progname); my_print_help(my_long_options); print_defaults("my", load_default_groups); my_print_variables(my_long_options); } static my_bool get_one_option(int optid, const struct my_option *opt __attribute__((unused)), char *argument) { uint length; switch(optid) { case 'f': force_pack= 1; tmpfile_createflag= O_RDWR | O_TRUNC; break; case 'p': if (force_pack_ref_length > 3) force_pack_ref_length= 0; break; case 's': write_loop= verbose= 0; silent= 1; break; case 't': test_only= verbose= 1; break; case 'T': length=(uint) (strmov(tmp_dir, argument) - tmp_dir); if (length != dirname_length(tmp_dir)) { tmp_dir[length]= FN_LIBCHAR; tmp_dir[length + 1]= 0; } break; case 'v': verbose= 1; silent= 0; break; case '#': DBUG_PUSH(argument ? argument : "d:t:o"); break; case 'V': print_version(); exit(0); case 'I': case '?': usage(); exit(0); } return 0; } /* reads options */ /* Initiates DEBUG - but no debugging here ! */ static void get_options(int *argc, char ***argv) { int ho_error; if ((ho_error=handle_options(argc, argv, my_long_options, get_one_option))) exit(ho_error); my_progname= argv[0][0]; if (isatty(fileno(stdout))) write_loop=1; if (!*argc) { usage(); exit(1); } if (join_table) { backup=0; /* Not needed */ tmp_dir[0]=0; } return; } static N_INFO *open_isam_file(char *name,int mode) { N_INFO *isam_file; ISAM_SHARE *share; DBUG_ENTER("open_isam_file"); if (!(isam_file=nisam_open(name,mode,(opt_wait ? HA_OPEN_WAIT_IF_LOCKED : HA_OPEN_ABORT_IF_LOCKED)))) { VOID(fprintf(stderr,"%s gave error %d on open\n",name,my_errno)); DBUG_RETURN(0); } share=isam_file->s; if (share->base.blobs) { VOID(fprintf(stderr,"%s has blobs, can't pack it\n",name)); VOID(nisam_close(isam_file)); DBUG_RETURN(0); } if (share->base.options & HA_OPTION_COMPRESS_RECORD && !join_table) { if (!force_pack) { VOID(fprintf(stderr,"%s is already compressed\n",name)); VOID(nisam_close(isam_file)); DBUG_RETURN(0); } if (verbose) puts("Recompressing already compressed table"); share->base.options&= ~HA_OPTION_READ_ONLY_DATA; /* We are modifing it */ } if (! force_pack && share->state.records != 0 && (share->state.records <= 1 || share->state.data_file_length < 1024) && ! join_table) { VOID(fprintf(stderr,"%s is too small to compress\n",name)); VOID(nisam_close(isam_file)); DBUG_RETURN(0); } VOID(nisam_lock_database(isam_file,F_WRLCK)); DBUG_RETURN(isam_file); } static bool open_isam_files(MRG_INFO *mrg,char **names,uint count) { uint i,j; mrg->count=0; mrg->current=0; mrg->file=(N_INFO**) my_malloc(sizeof(N_INFO*)*count,MYF(MY_FAE)); for (i=0; i < count ; i++) { if (!(mrg->file[i]=open_isam_file(names[i],O_RDONLY))) goto error; } /* Check that files are identical */ for (j=0 ; j < count-1 ; j++) { N_RECINFO *m1,*m2,*end; if (mrg->file[j]->s->base.reclength != mrg->file[j+1]->s->base.reclength || mrg->file[j]->s->base.fields != mrg->file[j+1]->s->base.fields) goto diff_file; m1=mrg->file[j]->s->rec; end=m1+mrg->file[j]->s->base.fields; m2=mrg->file[j+1]->s->rec; for ( ; m1 != end ; m1++,m2++) { if ((m1->base.type != m2->base.type && ! force_pack) || m1->base.length != m2->base.length) goto diff_file; } } mrg->count=count; return 0; diff_file: fprintf(stderr,"%s: Tables '%s' and '%s' are not identical\n", my_progname,names[j],names[j+1]); error: while (i--) nisam_close(mrg->file[i]); return 1; } static int compress(MRG_INFO *mrg,char *result_table) { int error; File new_file,join_isam_file; N_INFO *isam_file; ISAM_SHARE *share; char org_name[FN_REFLEN],new_name[FN_REFLEN],temp_name[FN_REFLEN]; uint i,header_length,fields,trees,used_trees; my_off_t old_length,new_length,tot_elements; HUFF_COUNTS *huff_counts; HUFF_TREE *huff_trees; DBUG_ENTER("compress"); isam_file=mrg->file[0]; /* Take this as an example */ share=isam_file->s; new_file=join_isam_file= -1; trees=fields=0; huff_trees=0; huff_counts=0; /* Create temporary or join file */ if (backup) VOID(fn_format(org_name,isam_file->filename,"",N_NAME_DEXT,2)); else VOID(fn_format(org_name,isam_file->filename,"",N_NAME_DEXT,2+4+16)); if (!test_only && result_table) { /* Make a new indexfile based on first file in list */ uint length; char *buff; strmov(org_name,result_table); /* Fix error messages */ VOID(fn_format(new_name,result_table,"",N_NAME_IEXT,2)); if ((join_isam_file=my_create(new_name,0,tmpfile_createflag,MYF(MY_WME))) < 0) goto err; length=share->base.keystart; if (!(buff=my_malloc(length,MYF(MY_WME)))) goto err; if (my_pread(share->kfile,buff,length,0L,MYF(MY_WME | MY_NABP)) || my_write(join_isam_file,buff,length, MYF(MY_WME | MY_NABP | MY_WAIT_IF_FULL))) { my_free(buff,MYF(0)); goto err; } my_free(buff,MYF(0)); VOID(fn_format(new_name,result_table,"",N_NAME_DEXT,2)); } else if (!tmp_dir[0]) VOID(make_new_name(new_name,org_name)); else VOID(fn_format(new_name,org_name,tmp_dir,DATA_TMP_EXT,1+2+4)); if (!test_only && (new_file=my_create(new_name,0,tmpfile_createflag,MYF(MY_WME))) < 0) goto err; /* Start calculating statistics */ mrg->records=0; for (i=0 ; i < mrg->count ; i++) mrg->records+=mrg->file[i]->s->state.records; if (write_loop || verbose) { printf("Compressing %s: (%lu records)\n", result_table ? new_name : org_name,(ulong) mrg->records); } trees=fields=share->base.fields; huff_counts=init_huff_count(isam_file,mrg->records); QUICK_SAFEMALLOC; if (write_loop || verbose) printf("- Calculating statistics\n"); if (get_statistic(mrg,huff_counts)) goto err; NORMAL_SAFEMALLOC; old_length=0; for (i=0; i < mrg->count ; i++) old_length+= (mrg->file[i]->s->state.data_file_length - mrg->file[i]->s->state.empty); if (init_queue(&queue,256,0,0,compare_huff_elements,0)) goto err; check_counts(huff_counts,fields,mrg->records); huff_trees=make_huff_trees(huff_counts,trees); if ((int) (used_trees=join_same_trees(huff_counts,trees)) < 0) goto err; if (make_huff_decode_table(huff_trees,fields)) goto err; init_file_buffer(new_file,0); file_buffer.pos_in_file=HEAD_LENGTH; if (! test_only) VOID(my_seek(new_file,file_buffer.pos_in_file,MY_SEEK_SET,MYF(0))); write_field_info(huff_counts,fields,used_trees); if (!(tot_elements=write_huff_tree(huff_trees,trees))) goto err; header_length=(uint) file_buffer.pos_in_file+ (uint) (file_buffer.pos-file_buffer.buffer); /* Compress file */ if (write_loop || verbose) printf("- Compressing file\n"); error=compress_isam_file(mrg,huff_counts); new_length=file_buffer.pos_in_file; if (!error && !test_only) { char buff[MEMMAP_EXTRA_MARGIN]; /* End marginal for memmap */ bzero(buff,sizeof(buff)); error=my_write(file_buffer.file,buff,sizeof(buff), MYF(MY_WME | MY_NABP | MY_WAIT_IF_FULL)) != 0; } if (!error) error=write_header(mrg,header_length,used_trees,tot_elements, new_length); end_file_buffer(); if (verbose && mrg->records) printf("Min record length: %6d Max length: %6d Mean total length: %6lu\n", mrg->min_pack_length,mrg->max_pack_length, (ulong) (new_length/mrg->records)); if (!test_only) { error|=my_close(new_file,MYF(MY_WME)); if (!result_table) { error|=my_close(isam_file->dfile,MYF(MY_WME)); isam_file->dfile= -1; /* Tell nisam_close file is closed */ } } free_counts_and_tree_and_queue(huff_trees,trees,huff_counts,fields); if (! test_only && ! error) { if (result_table) { error=save_state_mrg(join_isam_file,mrg,new_length,crc); } else { if (backup) { if (my_rename(org_name,make_old_name(temp_name,isam_file->filename), MYF(MY_WME))) error=1; else { if (tmp_dir[0]) { if (!(error=my_copy(new_name,org_name,MYF(MY_WME)))) VOID(my_delete(new_name,MYF(MY_WME))); } else error=my_rename(new_name,org_name,MYF(MY_WME)); if (!error) VOID(my_copystat(temp_name,org_name,MYF(MY_COPYTIME))); } } else { if (tmp_dir[0]) { if (!(error=my_copy(new_name,org_name, MYF(MY_WME | MY_HOLD_ORIGINAL_MODES | MY_COPYTIME)))) VOID(my_delete(new_name,MYF(MY_WME))); } else error=my_redel(org_name,new_name,MYF(MY_WME | MY_COPYTIME)); } if (! error) save_state(isam_file,mrg,new_length,crc); } } error|=mrg_close(mrg); if (join_isam_file >= 0) error|=my_close(join_isam_file,MYF(MY_WME)); if (error) { VOID(fprintf(stderr,"Aborting: %s is not compressed\n",org_name)); DBUG_RETURN(-1); } if (write_loop || verbose) { if (old_length) printf("%.4g%% \n", my_off_t2double(old_length-new_length)*100.0/ my_off_t2double(old_length)); else puts("Empty file saved in compressed format"); } DBUG_RETURN(0); err: free_counts_and_tree_and_queue(huff_trees,trees,huff_counts,fields); if (new_file >= 0) VOID(my_close(new_file,MYF(0))); if (join_isam_file >= 0) VOID(my_close(join_isam_file,MYF(0))); mrg_close(mrg); VOID(fprintf(stderr,"Aborted: %s is not compressed\n",org_name)); DBUG_RETURN(-1); } /* Init a huff_count-struct for each field and init it */ static HUFF_COUNTS *init_huff_count(N_INFO *info,my_off_t records) { reg2 uint i; reg1 HUFF_COUNTS *count; if ((count = (HUFF_COUNTS*) my_malloc(info->s->base.fields*sizeof(HUFF_COUNTS), MYF(MY_ZEROFILL | MY_WME)))) { for (i=0 ; i < info->s->base.fields ; i++) { enum en_fieldtype type; count[i].field_length=info->s->rec[i].base.length; type= count[i].field_type= (enum en_fieldtype) info->s->rec[i].base.type; if (type == FIELD_INTERVALL || type == FIELD_CONSTANT || type == FIELD_ZERO) type = FIELD_NORMAL; if (count[i].field_length <= 8 && (type == FIELD_NORMAL || type == FIELD_SKIP_ZERO)) count[i].max_zero_fill= count[i].field_length; init_tree(&count[i].int_tree,0,0,-1,(qsort_cmp2) compare_tree,0, NULL, NULL); if (records) count[i].tree_pos=count[i].tree_buff = my_malloc(count[i].field_length > 1 ? tree_buff_length : 2, MYF(MY_WME)); } } return count; } /* Free memory used by counts and trees */ static void free_counts_and_tree_and_queue(HUFF_TREE *huff_trees, uint trees, HUFF_COUNTS *huff_counts, uint fields) { register uint i; if (huff_trees) { for (i=0 ; i < trees ; i++) { if (huff_trees[i].element_buffer) my_free((gptr) huff_trees[i].element_buffer,MYF(0)); if (huff_trees[i].code) my_free((gptr) huff_trees[i].code,MYF(0)); } my_free((gptr) huff_trees,MYF(0)); } if (huff_counts) { for (i=0 ; i < fields ; i++) { if (huff_counts[i].tree_buff) { my_free((gptr) huff_counts[i].tree_buff,MYF(0)); delete_tree(&huff_counts[i].int_tree); } } my_free((gptr) huff_counts,MYF(0)); } delete_queue(&queue); /* This is safe to free */ return; } /* Read through old file and gather some statistics */ static int get_statistic(MRG_INFO *mrg,HUFF_COUNTS *huff_counts) { int error; uint length,reclength; byte *record,*pos,*next_pos,*end_pos,*start_pos; my_off_t record_count; HUFF_COUNTS *count,*end_count; TREE_ELEMENT *element; DBUG_ENTER("get_statistic"); reclength=mrg->file[0]->s->base.reclength; record=(byte*) my_alloca(reclength); end_count=huff_counts+mrg->file[0]->s->base.fields; record_count=crc=0; mrg_reset(mrg); while ((error=mrg_rrnd(mrg,record)) >= 0) { if (! error) { crc^=_nisam_checksum(record,reclength); for (pos=record,count=huff_counts ; count < end_count ; count++, pos=next_pos) { next_pos=end_pos=(start_pos=pos)+count->field_length; /* Put value in tree if there is room for it */ if (count->tree_buff) { global_count=count; if (!(element=tree_insert(&count->int_tree, pos, 0, count->int_tree.custom_arg)) || ((element->count == 1 && count->tree_buff + tree_buff_length < count->tree_pos + count->field_length) || (count->field_length == 1 && count->int_tree.elements_in_tree > 1))) { delete_tree(&count->int_tree); my_free(count->tree_buff,MYF(0)); count->tree_buff=0; } else { if (element->count == 1) { /* New element */ memcpy(count->tree_pos,pos,(size_t) count->field_length); tree_set_pointer(element,count->tree_pos); count->tree_pos+=count->field_length; } } } /* Save character counters and space-counts and zero-field-counts */ if (count->field_type == FIELD_NORMAL || count->field_type == FIELD_SKIP_ENDSPACE) { for ( ; end_pos > pos ; end_pos--) if (end_pos[-1] != ' ') break; if (end_pos == pos) { count->empty_fields++; count->max_zero_fill=0; continue; } length= (uint) (next_pos-end_pos); count->tot_end_space+=length; if (length < 8) count->end_space[length]++; if (count->max_end_space < length) count->max_end_space = length; } if (count->field_type == FIELD_NORMAL || count->field_type == FIELD_SKIP_PRESPACE) { for (pos=start_pos; pos < end_pos ; pos++) if (pos[0] != ' ') break; if (end_pos == pos) { count->empty_fields++; count->max_zero_fill=0; continue; } length= (uint) (pos-start_pos); count->tot_pre_space+=length; if (length < 8) count->pre_space[length]++; if (count->max_pre_space < length) count->max_pre_space = length; } if (count->field_length <= 8 && (count->field_type == FIELD_NORMAL || count->field_type == FIELD_SKIP_ZERO)) { uint i; if (!memcmp((byte*) start_pos,zero_string,count->field_length)) { count->zero_fields++; continue; } #ifdef BYTE_ORDER_HIGH_FIRST for (i =0 ; i < count->max_zero_fill && ! start_pos[i] ; i++) ; if (i < count->max_zero_fill) count->max_zero_fill=i; #else for (i =0 ; i < count->max_zero_fill && ! end_pos[-1 - (int) i] ; i++) ; if (i < count->max_zero_fill) count->max_zero_fill=i; #endif } for (pos=start_pos ; pos < end_pos ; pos++) count->counts[(uchar) *pos]++; } record_count++; if (write_loop && record_count % WRITE_COUNT == 0) { printf("%lu\r",(ulong) record_count); VOID(fflush(stdout)); } } } if (write_loop) { printf(" \r"); VOID(fflush(stdout)); } mrg->records=record_count; my_afree((gptr) record); DBUG_RETURN(0); } static int compare_huff_elements(void *not_used __attribute__((unused)), byte *a, byte *b) { return *((my_off_t*) a) < *((my_off_t*) b) ? -1 : (*((my_off_t*) a) == *((my_off_t*) b) ? 0 : 1); } /* Check each tree if we should use pre-space-compress, end-space- compress, empty-field-compress or zero-field-compress */ static void check_counts(HUFF_COUNTS *huff_counts, uint trees, my_off_t records) { uint space_fields,fill_zero_fields,field_count[(int) FIELD_ZERO+1]; my_off_t old_length,new_length,length; DBUG_ENTER("check_counts"); bzero((gptr) field_count,sizeof(field_count)); space_fields=fill_zero_fields=0; for (; trees-- ; huff_counts++) { huff_counts->field_type=FIELD_NORMAL; huff_counts->pack_type=0; if (huff_counts->zero_fields || ! records) { my_off_t old_space_count; if (huff_counts->zero_fields == records) { huff_counts->field_type= FIELD_ZERO; huff_counts->bytes_packed=0; huff_counts->counts[0]=0; goto found_pack; } old_space_count=huff_counts->counts[' ']; huff_counts->counts[' ']+=huff_counts->tot_end_space+ huff_counts->tot_pre_space + huff_counts->empty_fields * huff_counts->field_length; old_length=calc_packed_length(huff_counts,0)+records/8; length=huff_counts->zero_fields*huff_counts->field_length; huff_counts->counts[0]+=length; new_length=calc_packed_length(huff_counts,0); if (old_length < new_length && huff_counts->field_length > 1) { huff_counts->field_type=FIELD_SKIP_ZERO; huff_counts->counts[0]-=length; huff_counts->bytes_packed=old_length- records/8; goto found_pack; } huff_counts->counts[' ']=old_space_count; } huff_counts->bytes_packed=calc_packed_length(huff_counts,0); if (huff_counts->empty_fields) { if (huff_counts->field_length > 2 && huff_counts->empty_fields + (records - huff_counts->empty_fields)* (1+max_bit(max(huff_counts->max_pre_space, huff_counts->max_end_space))) < records * max_bit(huff_counts->field_length)) { huff_counts->pack_type |= PACK_TYPE_SPACE_FIELDS; } else { length=huff_counts->empty_fields*huff_counts->field_length; if (huff_counts->tot_end_space || ! huff_counts->tot_pre_space) { huff_counts->tot_end_space+=length; huff_counts->max_end_space=huff_counts->field_length; if (huff_counts->field_length < 8) huff_counts->end_space[huff_counts->field_length]+= huff_counts->empty_fields; } else { huff_counts->tot_pre_space+=length; huff_counts->max_pre_space=huff_counts->field_length; if (huff_counts->field_length < 8) huff_counts->pre_space[huff_counts->field_length]+= huff_counts->empty_fields; } } } if (huff_counts->tot_end_space) { huff_counts->counts[' ']+=huff_counts->tot_pre_space; if (test_space_compress(huff_counts,records,huff_counts->max_end_space, huff_counts->end_space, huff_counts->tot_end_space,FIELD_SKIP_ENDSPACE)) goto found_pack; huff_counts->counts[' ']-=huff_counts->tot_pre_space; } if (huff_counts->tot_pre_space) { if (test_space_compress(huff_counts,records,huff_counts->max_pre_space, huff_counts->pre_space, huff_counts->tot_pre_space,FIELD_SKIP_PRESPACE)) goto found_pack; } found_pack: /* Found field-packing */ /* Test if we can use zero-fill */ if (huff_counts->max_zero_fill && (huff_counts->field_type == FIELD_NORMAL || huff_counts->field_type == FIELD_SKIP_ZERO)) { huff_counts->counts[0]-=huff_counts->max_zero_fill* (huff_counts->field_type == FIELD_SKIP_ZERO ? records - huff_counts->zero_fields : records); huff_counts->pack_type|=PACK_TYPE_ZERO_FILL; huff_counts->bytes_packed=calc_packed_length(huff_counts,0); } /* Test if intervall-field is better */ if (huff_counts->tree_buff) { HUFF_TREE tree; tree.element_buffer=0; if (!make_huff_tree(&tree,huff_counts) && tree.bytes_packed+tree.tree_pack_length < huff_counts->bytes_packed) { if (tree.elements == 1) huff_counts->field_type=FIELD_CONSTANT; else huff_counts->field_type=FIELD_INTERVALL; huff_counts->pack_type=0; } else { my_free((gptr) huff_counts->tree_buff,MYF(0)); delete_tree(&huff_counts->int_tree); huff_counts->tree_buff=0; } if (tree.element_buffer) my_free((gptr) tree.element_buffer,MYF(0)); } if (huff_counts->pack_type & PACK_TYPE_SPACE_FIELDS) space_fields++; if (huff_counts->pack_type & PACK_TYPE_ZERO_FILL) fill_zero_fields++; field_count[huff_counts->field_type]++; } if (verbose) printf("\nnormal: %3d empty-space: %3d empty-zero: %3d empty-fill: %3d\npre-space: %3d end-space: %3d table-lookup: %3d zero: %3d\n", field_count[FIELD_NORMAL],space_fields, field_count[FIELD_SKIP_ZERO],fill_zero_fields, field_count[FIELD_SKIP_PRESPACE], field_count[FIELD_SKIP_ENDSPACE], field_count[FIELD_INTERVALL], field_count[FIELD_ZERO]); DBUG_VOID_RETURN; } /* Test if we can use space-compression and empty-field-compression */ static int test_space_compress(HUFF_COUNTS *huff_counts, my_off_t records, uint max_space_length, my_off_t *space_counts, my_off_t tot_space_count, enum en_fieldtype field_type) { int min_pos; uint length_bits,i; my_off_t space_count,min_space_count,min_pack,new_length,skipp; length_bits=max_bit(max_space_length); /* Default no end_space-packing */ space_count=huff_counts->counts[(uint) ' ']; min_space_count= (huff_counts->counts[(uint) ' ']+= tot_space_count); min_pack=calc_packed_length(huff_counts,0); min_pos= -2; huff_counts->counts[(uint) ' ']=space_count; /* Test with allways space-count */ new_length=huff_counts->bytes_packed+length_bits*records/8; if (new_length+1 < min_pack) { min_pos= -1; min_pack=new_length; min_space_count=space_count; } /* Test with length-flag */ for (skipp=0L, i=0 ; i < 8 ; i++) { if (space_counts[i]) { if (i) huff_counts->counts[(uint) ' ']+=space_counts[i]; skipp+=huff_counts->pre_space[i]; new_length=calc_packed_length(huff_counts,0)+ (records+(records-skipp)*(1+length_bits))/8; if (new_length < min_pack) { min_pos=(int) i; min_pack=new_length; min_space_count=huff_counts->counts[(uint) ' ']; } } } huff_counts->counts[(uint) ' ']=min_space_count; huff_counts->bytes_packed=min_pack; switch (min_pos) { case -2: return(0); /* No space-compress */ case -1: /* Always space-count */ huff_counts->field_type=field_type; huff_counts->min_space=0; huff_counts->length_bits=max_bit(max_space_length); break; default: huff_counts->field_type=field_type; huff_counts->min_space=(uint) min_pos; huff_counts->pack_type|=PACK_TYPE_SELECTED; huff_counts->length_bits=max_bit(max_space_length); break; } return(1); /* Using space-compress */ } /* Make a huff_tree of each huff_count */ static HUFF_TREE* make_huff_trees(HUFF_COUNTS *huff_counts, uint trees) { uint tree; HUFF_TREE *huff_tree; DBUG_ENTER("make_huff_trees"); if (!(huff_tree=(HUFF_TREE*) my_malloc(trees*sizeof(HUFF_TREE), MYF(MY_WME | MY_ZEROFILL)))) DBUG_RETURN(0); for (tree=0 ; tree < trees ; tree++) { if (make_huff_tree(huff_tree+tree,huff_counts+tree)) { while (tree--) my_free((gptr) huff_tree[tree].element_buffer,MYF(0)); my_free((gptr) huff_tree,MYF(0)); DBUG_RETURN(0); } } DBUG_RETURN(huff_tree); } /* Update huff_tree according to huff_counts->counts or huff_counts->tree_buff */ static int make_huff_tree(HUFF_TREE *huff_tree, HUFF_COUNTS *huff_counts) { uint i,found,bits_packed,first,last; my_off_t bytes_packed; HUFF_ELEMENT *a,*b,*new; first=last=0; if (huff_counts->tree_buff) { found= (uint) (huff_counts->tree_pos - huff_counts->tree_buff) / huff_counts->field_length; first=0; last=found-1; } else { for (i=found=0 ; i < 256 ; i++) { if (huff_counts->counts[i]) { if (! found++) first=i; last=i; } } if (found < 2) found=2; } if (queue.max_elements < found) { delete_queue(&queue); if (init_queue(&queue,found,0,0,compare_huff_elements,0)) return -1; } if (!huff_tree->element_buffer) { if (!(huff_tree->element_buffer= (HUFF_ELEMENT*) my_malloc(found*2*sizeof(HUFF_ELEMENT),MYF(MY_WME)))) return 1; } else { HUFF_ELEMENT *temp; if (!(temp= (HUFF_ELEMENT*) my_realloc((gptr) huff_tree->element_buffer, found*2*sizeof(HUFF_ELEMENT), MYF(MY_WME)))) return 1; huff_tree->element_buffer=temp; } huff_counts->tree=huff_tree; huff_tree->counts=huff_counts; huff_tree->min_chr=first; huff_tree->max_chr=last; huff_tree->char_bits=max_bit(last-first); huff_tree->offset_bits=max_bit(found-1)+1; if (huff_counts->tree_buff) { huff_tree->elements=0; tree_walk(&huff_counts->int_tree, (int (*)(void*, element_count,void*)) save_counts_in_queue, (gptr) huff_tree, left_root_right); huff_tree->tree_pack_length=(1+15+16+5+5+ (huff_tree->char_bits+1)*found+ (huff_tree->offset_bits+1)* (found-2)+7)/8 + (uint) (huff_tree->counts->tree_pos- huff_tree->counts->tree_buff); } else { huff_tree->elements=found; huff_tree->tree_pack_length=(9+9+5+5+ (huff_tree->char_bits+1)*found+ (huff_tree->offset_bits+1)* (found-2)+7)/8; for (i=first, found=0 ; i <= last ; i++) { if (huff_counts->counts[i]) { new=huff_tree->element_buffer+(found++); new->count=huff_counts->counts[i]; new->a.leaf.null=0; new->a.leaf.element_nr=i; queue.root[found]=(byte*) new; } } while (found < 2) { /* Our huff_trees request at least 2 elements */ new=huff_tree->element_buffer+(found++); new->count=0; new->a.leaf.null=0; if (last) new->a.leaf.element_nr=huff_tree->min_chr=last-1; else new->a.leaf.element_nr=huff_tree->max_chr=last+1; queue.root[found]=(byte*) new; } } queue.elements=found; for (i=found/2 ; i > 0 ; i--) _downheap(&queue,i); bytes_packed=0; bits_packed=0; for (i=1 ; i < found ; i++) { a=(HUFF_ELEMENT*) queue_remove(&queue,0); b=(HUFF_ELEMENT*) queue.root[1]; new=huff_tree->element_buffer+found+i; new->count=a->count+b->count; bits_packed+=(uint) (new->count & 7); bytes_packed+=new->count/8; new->a.nod.left=a; /* lesser in left */ new->a.nod.right=b; queue.root[1]=(byte*) new; queue_replaced(&queue); } huff_tree->root=(HUFF_ELEMENT*) queue.root[1]; huff_tree->bytes_packed=bytes_packed+(bits_packed+7)/8; return 0; } static int compare_tree(register const uchar *s, register const uchar *t) { uint length; for (length=global_count->field_length; length-- ;) if (*s++ != *t++) return (int) s[-1] - (int) t[-1]; return 0; } /* Used by make_huff_tree to save intervall-counts in queue */ static int save_counts_in_queue(byte *key, element_count count, HUFF_TREE *tree) { HUFF_ELEMENT *new; new=tree->element_buffer+(tree->elements++); new->count=count; new->a.leaf.null=0; new->a.leaf.element_nr= (uint) (key- tree->counts->tree_buff) / tree->counts->field_length; queue.root[tree->elements]=(byte*) new; return 0; } /* Calculate length of file if given counts should be used */ /* Its actually a faster version of make_huff_tree */ static my_off_t calc_packed_length(HUFF_COUNTS *huff_counts, uint add_tree_lenght) { uint i,found,bits_packed,first,last; my_off_t bytes_packed; HUFF_ELEMENT element_buffer[256]; DBUG_ENTER("calc_packed_length"); first=last=0; for (i=found=0 ; i < 256 ; i++) { if (huff_counts->counts[i]) { if (! found++) first=i; last=i; queue.root[found]=(byte*) &huff_counts->counts[i]; } } if (!found) DBUG_RETURN(0); /* Empty tree */ if (found < 2) queue.root[++found]=(byte*) &huff_counts->counts[last ? 0 : 1]; queue.elements=found; bytes_packed=0; bits_packed=0; if (add_tree_lenght) bytes_packed=(8+9+5+5+(max_bit(last-first)+1)*found+ (max_bit(found-1)+1+1)*(found-2) +7)/8; for (i=(found+1)/2 ; i > 0 ; i--) _downheap(&queue,i); for (i=0 ; i < found-1 ; i++) { HUFF_ELEMENT *a,*b,*new; a=(HUFF_ELEMENT*) queue_remove(&queue,0); b=(HUFF_ELEMENT*) queue.root[1]; new=element_buffer+i; new->count=a->count+b->count; bits_packed+=(uint) (new->count & 7); bytes_packed+=new->count/8; queue.root[1]=(byte*) new; queue_replaced(&queue); } DBUG_RETURN(bytes_packed+(bits_packed+7)/8); } /* Remove trees that don't give any compression */ static uint join_same_trees(HUFF_COUNTS *huff_counts, uint trees) { uint k,tree_number; HUFF_COUNTS count,*i,*j,*last_count; last_count=huff_counts+trees; for (tree_number=0, i=huff_counts ; i < last_count ; i++) { if (!i->tree->tree_number) { i->tree->tree_number= ++tree_number; if (i->tree_buff) continue; /* Don't join intervall */ for (j=i+1 ; j < last_count ; j++) { if (! j->tree->tree_number && ! j->tree_buff) { for (k=0 ; k < 256 ; k++) count.counts[k]=i->counts[k]+j->counts[k]; if (calc_packed_length(&count,1) <= i->tree->bytes_packed + j->tree->bytes_packed+ i->tree->tree_pack_length+j->tree->tree_pack_length+ ALLOWED_JOIN_DIFF) { memcpy((byte*) i->counts,(byte*) count.counts, sizeof(count.counts[0])*256); my_free((gptr) j->tree->element_buffer,MYF(0)); j->tree->element_buffer=0; j->tree=i->tree; bmove((byte*) i->counts,(byte*) count.counts, sizeof(count.counts[0])*256); if (make_huff_tree(i->tree,i)) return (uint) -1; } } } } } if (verbose) printf("Original trees: %d After join: %d\n",trees,tree_number); return tree_number; /* Return trees left */ } /* Fill in huff_tree decode tables */ static int make_huff_decode_table(HUFF_TREE *huff_tree, uint trees) { uint elements; for ( ; trees-- ; huff_tree++) { if (huff_tree->tree_number > 0) { elements=huff_tree->counts->tree_buff ? huff_tree->elements : 256; if (!(huff_tree->code = (ulong*) my_malloc(elements* (sizeof(ulong)+sizeof(uchar)), MYF(MY_WME | MY_ZEROFILL)))) return 1; huff_tree->code_len=(uchar*) (huff_tree->code+elements); make_traverse_code_tree(huff_tree,huff_tree->root,32,0); } } return 0; } static void make_traverse_code_tree(HUFF_TREE *huff_tree, HUFF_ELEMENT *element, uint size, ulong code) { uint chr; if (!element->a.leaf.null) { chr=element->a.leaf.element_nr; huff_tree->code_len[chr]=(uchar) (32-size); huff_tree->code[chr]= (code >> size); if (huff_tree->height < 32-size) huff_tree->height= 32-size; } else { size--; make_traverse_code_tree(huff_tree,element->a.nod.left,size,code); make_traverse_code_tree(huff_tree,element->a.nod.right,size, code+((ulong) 1L << size)); } return; } /* Write header to new packed data file */ static int write_header(MRG_INFO *mrg,uint head_length,uint trees, my_off_t tot_elements,my_off_t filelength) { byte *buff=file_buffer.pos; bzero(buff,HEAD_LENGTH); memcpy(buff,nisam_pack_file_magic,4); int4store(buff+4,head_length); int4store(buff+8, mrg->min_pack_length); int4store(buff+12,mrg->max_pack_length); int4store(buff+16,tot_elements); int4store(buff+20,intervall_length); int2store(buff+24,trees); buff[26]=(char) mrg->ref_length; /* Save record pointer length */ buff[27]= (uchar) (filelength >= (1L << 24) ? 4 : filelength >= (1L << 16) ? 3 : 2); if (test_only) return 0; VOID(my_seek(file_buffer.file,0L,MY_SEEK_SET,MYF(0))); return my_write(file_buffer.file,file_buffer.pos,HEAD_LENGTH, MYF(MY_WME | MY_NABP | MY_WAIT_IF_FULL)) != 0; } /* Write fieldinfo to new packed file */ static void write_field_info(HUFF_COUNTS *counts, uint fields, uint trees) { reg1 uint i; uint huff_tree_bits; huff_tree_bits=max_bit(trees ? trees-1 : 0); for (i=0 ; i++ < fields ; counts++) { write_bits((ulong) (int) counts->field_type,4); write_bits(counts->pack_type,4); if (counts->pack_type & PACK_TYPE_ZERO_FILL) write_bits(counts->max_zero_fill,4); else write_bits(counts->length_bits,4); write_bits((ulong) counts->tree->tree_number-1,huff_tree_bits); } flush_bits(); return; } /* Write all huff_trees to new datafile. Return tot count of elements in all trees Returns 0 on error */ static my_off_t write_huff_tree(HUFF_TREE *huff_tree, uint trees) { uint i,int_length; uint *packed_tree,*offset,length; my_off_t elements; for (i=length=0 ; i < trees ; i++) if (huff_tree[i].tree_number > 0 && huff_tree[i].elements > length) length=huff_tree[i].elements; if (!(packed_tree=(uint*) my_alloca(sizeof(uint)*length*2))) { my_error(EE_OUTOFMEMORY,MYF(ME_BELL),sizeof(uint)*length*2); return 0; } intervall_length=0; for (elements=0; trees-- ; huff_tree++) { if (huff_tree->tree_number == 0) continue; /* Deleted tree */ elements+=huff_tree->elements; huff_tree->max_offset=2; if (huff_tree->elements <= 1) offset=packed_tree; else offset=make_offset_code_tree(huff_tree,huff_tree->root,packed_tree); huff_tree->offset_bits=max_bit(huff_tree->max_offset); if (huff_tree->max_offset >= IS_OFFSET) { /* This should be impossible */ VOID(fprintf(stderr,"Tree offset got too big: %d, aborted\n", huff_tree->max_offset)); my_afree((gptr) packed_tree); return 0; } #ifdef EXTRA_DBUG printf("pos: %d elements: %d tree-elements: %d char_bits: %d\n", (uint) (file_buffer.pos-file_buffer.buffer), huff_tree->elements, (offset-packed_tree),huff_tree->char_bits); #endif if (!huff_tree->counts->tree_buff) { write_bits(0,1); write_bits(huff_tree->min_chr,8); write_bits(huff_tree->elements,9); write_bits(huff_tree->char_bits,5); write_bits(huff_tree->offset_bits,5); int_length=0; } else { int_length=(uint) (huff_tree->counts->tree_pos - huff_tree->counts->tree_buff); write_bits(1,1); write_bits(huff_tree->elements,15); write_bits(int_length,16); write_bits(huff_tree->char_bits,5); write_bits(huff_tree->offset_bits,5); intervall_length+=int_length; } length=(uint) (offset-packed_tree); if (length != huff_tree->elements*2-2) printf("error: Huff-tree-length: %d != calc_length: %d\n", length,huff_tree->elements*2-2); for (i=0 ; i < length ; i++) { if (packed_tree[i] & IS_OFFSET) write_bits(packed_tree[i] - IS_OFFSET+ ((ulong) 1L << huff_tree->offset_bits), huff_tree->offset_bits+1); else write_bits(packed_tree[i]-huff_tree->min_chr,huff_tree->char_bits+1); } flush_bits(); if (huff_tree->counts->tree_buff) { for (i=0 ; i < int_length ; i++) write_bits((uint) (uchar) huff_tree->counts->tree_buff[i],8); } flush_bits(); } my_afree((gptr) packed_tree); return elements; } static uint *make_offset_code_tree(HUFF_TREE *huff_tree, HUFF_ELEMENT *element, uint *offset) { uint *prev_offset; prev_offset= offset; if (!element->a.nod.left->a.leaf.null) { offset[0] =(uint) element->a.nod.left->a.leaf.element_nr; offset+=2; } else { prev_offset[0]= IS_OFFSET+2; offset=make_offset_code_tree(huff_tree,element->a.nod.left,offset+2); } if (!element->a.nod.right->a.leaf.null) { prev_offset[1]=element->a.nod.right->a.leaf.element_nr; return offset; } else { uint temp=(uint) (offset-prev_offset-1); prev_offset[1]= IS_OFFSET+ temp; if (huff_tree->max_offset < temp) huff_tree->max_offset = temp; return make_offset_code_tree(huff_tree,element->a.nod.right,offset); } } /* Get number of bits neaded to represent value */ static uint max_bit(register uint value) { reg2 uint power=1; while ((value>>=1)) power++; return (power); } static int compress_isam_file(MRG_INFO *mrg, HUFF_COUNTS *huff_counts) { int error; uint i,max_calc_length,pack_ref_length,min_record_length,max_record_length, intervall,field_length; my_off_t record_count,max_allowed_length; ulong length; byte *record,*pos,*end_pos,*record_pos,*start_pos; HUFF_COUNTS *count,*end_count; HUFF_TREE *tree; N_INFO *isam_file=mrg->file[0]; DBUG_ENTER("compress_isam_file"); if (!(record=(byte*) my_alloca(isam_file->s->base.reclength))) return -1; end_count=huff_counts+isam_file->s->base.fields; min_record_length= (uint) ~0; max_record_length=0; for (i=max_calc_length=0 ; i < isam_file->s->base.fields ; i++) { if (!(huff_counts[i].pack_type & PACK_TYPE_ZERO_FILL)) huff_counts[i].max_zero_fill=0; if (huff_counts[i].field_type == FIELD_CONSTANT || huff_counts[i].field_type == FIELD_ZERO) continue; if (huff_counts[i].field_type == FIELD_INTERVALL) max_calc_length+=huff_counts[i].tree->height; else max_calc_length+= (huff_counts[i].field_length - huff_counts[i].max_zero_fill)* huff_counts[i].tree->height+huff_counts[i].length_bits; } max_calc_length/=8; if (max_calc_length <= 255) pack_ref_length=1; else if (max_calc_length <= 65535) pack_ref_length=2; else pack_ref_length=3; if (force_pack_ref_length) pack_ref_length=force_pack_ref_length; max_allowed_length= 1L << (pack_ref_length*8); record_count=0; mrg_reset(mrg); while ((error=mrg_rrnd(mrg,record)) >= 0) { if (! error) { if (flush_buffer(max_calc_length+pack_ref_length)) break; record_pos=file_buffer.pos; file_buffer.pos+=pack_ref_length; for (start_pos=record, count= huff_counts; count < end_count ; count++) { end_pos=start_pos+(field_length=count->field_length); tree=count->tree; if (count->pack_type & PACK_TYPE_SPACE_FIELDS) { for (pos=start_pos ; *pos == ' ' && pos < end_pos; pos++) ; if (pos == end_pos) { write_bits(1,1); start_pos=end_pos; continue; } write_bits(0,1); } #ifdef BYTE_ORDER_HIGH_FIRST start_pos+=count->max_zero_fill; #else end_pos-=count->max_zero_fill; #endif field_length-=count->max_zero_fill; switch(count->field_type) { case FIELD_SKIP_ZERO: if (!memcmp((byte*) start_pos,zero_string,field_length)) { write_bits(1,1); start_pos=end_pos; break; } write_bits(0,1); /* Fall through */ case FIELD_NORMAL: for ( ; start_pos < end_pos ; start_pos++) write_bits(tree->code[(uchar) *start_pos], (uint) tree->code_len[(uchar) *start_pos]); break; case FIELD_SKIP_ENDSPACE: for (pos=end_pos ; pos > start_pos && pos[-1] == ' ' ; pos--) ; length=(uint) (end_pos-pos); if (count->pack_type & PACK_TYPE_SELECTED) { if (length > count->min_space) { write_bits(1,1); write_bits(length,count->length_bits); } else { write_bits(0,1); pos=end_pos; } } else write_bits(length,count->length_bits); for ( ; start_pos < pos ; start_pos++) write_bits(tree->code[(uchar) *start_pos], (uint) tree->code_len[(uchar) *start_pos]); start_pos=end_pos; break; case FIELD_SKIP_PRESPACE: for (pos=start_pos ; pos < end_pos && pos[0] == ' ' ; pos++) ; length=(uint) (pos-start_pos); if (count->pack_type & PACK_TYPE_SELECTED) { if (length > count->min_space) { write_bits(1,1); write_bits(length,count->length_bits); } else { pos=start_pos; write_bits(0,1); } } else write_bits(length,count->length_bits); for (start_pos=pos ; start_pos < end_pos ; start_pos++) write_bits(tree->code[(uchar) *start_pos], (uint) tree->code_len[(uchar) *start_pos]); break; case FIELD_CONSTANT: case FIELD_ZERO: start_pos=end_pos; break; case FIELD_INTERVALL: global_count=count; pos=(byte*) tree_search(&count->int_tree, start_pos, count->int_tree.custom_arg); intervall=(uint) (pos - count->tree_buff)/field_length; write_bits(tree->code[intervall],(uint) tree->code_len[intervall]); start_pos=end_pos; break; case FIELD_BLOB: VOID(fprintf(stderr,"Can't pack files with blobs. Aborting\n")); DBUG_RETURN(1); case FIELD_LAST: case FIELD_VARCHAR: case FIELD_CHECK: abort(); /* Impossible */ } #ifndef BYTE_ORDER_HIGH_FIRST start_pos+=count->max_zero_fill; #endif } flush_bits(); length=(ulong) (file_buffer.pos-record_pos)-pack_ref_length; save_integer(record_pos,pack_ref_length,length); if (length < (ulong) min_record_length) min_record_length=(uint) length; if (length > (ulong) max_record_length) { max_record_length=(uint) length; if (max_record_length >= max_allowed_length) { fprintf(stderr, "Error: Found record with packed-length: %d, max is: %lu\n", max_record_length, (ulong) max_allowed_length); error=1; break; } } if (write_loop && ++record_count % WRITE_COUNT == 0) { printf("%lu\r",(ulong) record_count); VOID(fflush(stdout)); } } else if (my_errno != HA_ERR_RECORD_DELETED) break; } if (error < 0) { error=0; if (my_errno != HA_ERR_END_OF_FILE) { fprintf(stderr,"%s: Got error %d reading records\n",my_progname,my_errno); error= 1; } } my_afree((gptr) record); mrg->ref_length=pack_ref_length; mrg->min_pack_length=max_record_length ? min_record_length : 0; mrg->max_pack_length=max_record_length; if (verbose && max_record_length && max_record_length < max_allowed_length/256) printf("Record-length is %d bytes, could have been %d bytes\nYou can change this by using -p=%d next time you pack this file\n", pack_ref_length, max_record_length/256+1, max_record_length/256+1); DBUG_RETURN(error || error_on_write || flush_buffer((uint) ~0)); } static char *make_new_name(char *new_name, char *old_name) { return fn_format(new_name,old_name,"",DATA_TMP_EXT,2+4); } static char *make_old_name(char *new_name, char *old_name) { return fn_format(new_name,old_name,"",OLD_EXT,2+4); } /* rutines for bit writing buffer */ static void init_file_buffer(File file, pbool read_buffer) { file_buffer.file=file; file_buffer.buffer=my_malloc(ALIGN_SIZE(RECORD_CACHE_SIZE),MYF(MY_WME)); file_buffer.end=file_buffer.buffer+ALIGN_SIZE(RECORD_CACHE_SIZE)-4; file_buffer.pos_in_file=0; error_on_write=0; if (read_buffer) { file_buffer.pos=file_buffer.end; file_buffer.bits=0; } else { file_buffer.pos=file_buffer.buffer; file_buffer.bits=BITS_SAVED; } file_buffer.bytes=0; } static int flush_buffer(uint neaded_length) { uint length; if ((uint) (file_buffer.end - file_buffer.pos) > neaded_length) return 0; length=(uint) (file_buffer.pos-file_buffer.buffer); file_buffer.pos=file_buffer.buffer; file_buffer.pos_in_file+=length; if (test_only) return 0; return (error_on_write|=test(my_write(file_buffer.file,file_buffer.buffer, length, MYF(MY_WME | MY_NABP | MY_WAIT_IF_FULL)))); } static void end_file_buffer(void) { my_free((gptr) file_buffer.buffer,MYF(0)); } /* output `bits` low bits of `value' */ static void write_bits (register ulong value, register uint bits) { if ((file_buffer.bits-=(int) bits) >= 0) { file_buffer.bytes|=value << file_buffer.bits; } else { reg3 uint byte_buff; bits= (uint) -file_buffer.bits; byte_buff=file_buffer.bytes | (uint) (value >> bits); #if BITS_SAVED == 32 *file_buffer.pos++= (byte) (byte_buff >> 24) ; *file_buffer.pos++= (byte) (byte_buff >> 16) ; #endif *file_buffer.pos++= (byte) (byte_buff >> 8) ; *file_buffer.pos++= (byte) byte_buff; value&=((ulong) 1L << bits)-1; #if BITS_SAVED == 16 if (bits >= sizeof(uint)) { bits-=8; *file_buffer.pos++= (uchar) (value >> bits); value&= ((ulong) 1L << bits)-1; if (bits >= sizeof(uint)) { bits-=8; *file_buffer.pos++= (uchar) (value >> bits); value&= ((ulong) 1L << bits)-1; } } #endif if (file_buffer.pos >= file_buffer.end) VOID(flush_buffer((uint) ~0)); file_buffer.bits=(int) (BITS_SAVED - bits); file_buffer.bytes=(uint) (value << (BITS_SAVED - bits)); } return; } /* Flush bits in bit_buffer to buffer */ static void flush_bits (void) { uint bits,byte_buff; bits=(file_buffer.bits) & ~7; byte_buff = file_buffer.bytes >> bits; bits=BITS_SAVED - bits; while (bits > 0) { bits-=8; *file_buffer.pos++= (byte) (uchar) (byte_buff >> bits) ; } file_buffer.bits=BITS_SAVED; file_buffer.bytes=0; return; } /* Store long in 1,2,3,4 or 5 bytes */ static void save_integer(byte *pos, uint pack_length, my_off_t value) { switch (pack_length) { case 5: int5store(pos,(ulonglong) value); break; default: int4store(pos,(ulong) value); break; case 3: int3store(pos,(ulong) value); break; case 2: int2store(pos,(uint) value); break; case 1: pos[0]= (byte) (uchar) value; break; } return; } /**************************************************************************** ** functions to handle the joined files ****************************************************************************/ static void save_state(N_INFO *isam_file,MRG_INFO *mrg,my_off_t new_length, ulong crc) { ISAM_SHARE *share=isam_file->s; uint options=uint2korr(share->state.header.options); DBUG_ENTER("save_state"); options|= HA_OPTION_COMPRESS_RECORD | HA_OPTION_READ_ONLY_DATA; int2store(share->state.header.options,options); share->state.data_file_length=(ulong) new_length; share->state.del=share->state.empty=0; share->state.dellink= (ulong) NI_POS_ERROR; share->state.splitt=(ulong) mrg->records; share->state.version=(ulong) time((time_t*) 0); share->state.keys=0; share->state.key_file_length=share->base.keystart; isam_file->update|=(HA_STATE_CHANGED | HA_STATE_ROW_CHANGED); isam_file->this_uniq=crc; /* Save crc here */ share->changed=1; /* Force write of header */ VOID(my_chsize(share->kfile, share->state.key_file_length, 0, MYF(0))); if (share->state.keys != share->base.keys) isamchk_neaded=1; DBUG_VOID_RETURN; } static int save_state_mrg(File file,MRG_INFO *mrg,my_off_t new_length, ulong crc) { N_STATE_INFO state; N_INFO *isam_file=mrg->file[0]; uint options; DBUG_ENTER("save_state_mrg"); memcpy(&state,&isam_file->s->state,sizeof(state)); options= (uint2korr(state.header.options) | HA_OPTION_COMPRESS_RECORD | HA_OPTION_READ_ONLY_DATA); int2store(state.header.options,options); state.data_file_length=(ulong) new_length; state.del=state.empty=0; state.dellink= (ulong) NI_POS_ERROR; state.records=state.splitt=(ulong) mrg->records; state.version=(ulong) time((time_t*) 0); state.keys=0; state.key_file_length=isam_file->s->base.keystart; state.uniq=crc; if (state.keys != isam_file->s->base.keys) isamchk_neaded=1; DBUG_RETURN (my_pwrite(file,(char*) &state.header, isam_file->s->state_length,0L, MYF(MY_NABP | MY_WME)) != 0); } /* reset for mrg_rrnd */ static void mrg_reset(MRG_INFO *mrg) { if (mrg->current) { nisam_extra(*mrg->current,HA_EXTRA_NO_CACHE); mrg->current=0; } } static int mrg_rrnd(MRG_INFO *info,byte *buf) { int error; N_INFO *isam_info; my_off_t filepos; if (!info->current) { isam_info= *(info->current=info->file); info->end=info->current+info->count; nisam_extra(isam_info,HA_EXTRA_RESET); nisam_extra(isam_info,HA_EXTRA_CACHE); filepos=isam_info->s->pack.header_length; } else { isam_info= *info->current; filepos= isam_info->nextpos; } for (;;) { isam_info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED); if ((error=(*isam_info->s->read_rnd)(isam_info,(byte*) buf, (ulong) filepos, 1)) >= 0 || my_errno != HA_ERR_END_OF_FILE) return (error); nisam_extra(isam_info,HA_EXTRA_NO_CACHE); if (info->current+1 == info->end) return(-1); info->current++; isam_info= *info->current; filepos=isam_info->s->pack.header_length; nisam_extra(isam_info,HA_EXTRA_RESET); nisam_extra(isam_info,HA_EXTRA_CACHE); } } static int mrg_close(MRG_INFO *mrg) { uint i; int error=0; for (i=0 ; i < mrg->count ; i++) error|=nisam_close(mrg->file[i]); return error; }