Помогите разобраться с кодом программы для работы с файлами СУБД Cronos, особенно с процедурой
encode (что есть offset, buf, kod..). Как эта процедура будет реализована в VB. Буду очень
благодарен за комментарии. Ну в крайнем случае можете послать меня на ... другой форум.
#include <stdio.h>
#include <alloc.h>
#include <share.h>
#include <fcntl.h>
#include <stat.h>
int nbases;
unsigned char n_bank[30];
unsigned char adr_bank[60];
unsigned char adr_sl[60];
struct POLE {
unsigned int p_number;
unsigned char number[4];
unsigned char name[36];
unsigned char type[3];
unsigned int len;
unsigned int mn;
unsigned int slovar;
};
struct BANK {
unsigned int b_number;
unsigned char name[36];
unsigned char mnk[3];
unsigned int n;
struct POLE * p_pole;
int fd;
int fi;
} * bank_stru=NULL;
int get_stru()
{
int i,j,l;
FILE *fin;
fin=fopen("c:\\cronet\\stru.","rb");
if (fin==NULL) return(-1);
fread(&l,2,1,fin); fread(n_bank,l,1,fin);
fread(&l,2,1,fin); fread(adr_bank,l,1,fin);
fread(&l,2,1,fin); fread(adr_sl,l,1,fin);
fread(&nbases,2,1,fin);
bank_stru=(struct BANK *) calloc(nbases,sizeof(struct BANK));
if (bank_stru==NULL) return(-2);
for (i=0; i<nbases; i++) {
bank_stru[i].fd=-1; bank_stru[i].fi=-1;
fread(&bank_stru[i].b_number,2,1,fin);
fread(bank_stru[i].name,36,1,fin);
fread(bank_stru[i].mnk, 3,1,fin);
fread(&bank_stru[i].n, 2,1,fin);
bank_stru[i].p_pole=(struct POLE*)calloc(bank_stru[i].n,sizeof(struct POLE));
if (bank_stru[i].p_pole==NULL) return(-3);
for (l=0;l<bank_stru[i].n;l++) {
fread(&bank_stru[i].p_pole[l].p_number,2,1,fin);
fread(bank_stru[i].p_pole[l].number,4,1,fin);
fread(bank_stru[i].p_pole[l].name,36,1,fin);
fread(bank_stru[i].p_pole[l].type,3,1,fin);
fread(&bank_stru[i].p_pole[l].len,2,1,fin);
fread(&bank_stru[i].p_pole[l].mn,2,1,fin);
fread(&bank_stru[i].p_pole[l].slovar,2,1,fin);
}
}
return(0);
}
int datopen(i) /* Ќг¬Ґа жЁп б 1 */
int i;
{ unsigned char buf[100];
if (bank_stru==NULL) if (get_stru()<0) return(-2);
i--;
if (bank_stru[i].fd==-1) {
sprintf(buf,"%sb%02d.dat",adr_bank,i+1);
bank_stru[i].fd=open(buf,O_BINARY|O_DENYNONE,S_IFREG);
if (bank_stru[i].fd==-1) return(-1);
}
if (bank_stru[i].fi==-1) {
sprintf(buf,"%sb%02d.tad",adr_bank,i+1);
bank_stru[i].fi=open(buf,O_BINARY|O_DENYNONE,S_IFREG);
if (bank_stru[i].fi==-1) return(-1);
}
return(0);
}
datclose(i) /* Ќг¬Ґа жЁп б 1 */
int i;
{ i--; close(bank_stru[i].fd); close(bank_stru[i].fi);
bank_stru[i].fd=-1; bank_stru[i].fi=-1;
}
unsigned char kod[256] = {
0x08, 0x63, 0x81, 0x38, 0xa3, 0x6b, 0x82, 0xa6, 0x18, 0x0d, 0xac, 0xd5, 0xfe, 0xbe, 0x15,
0xf6,
0xa5, 0x36, 0x76, 0xe2, 0x2d, 0x41, 0xb5, 0x12, 0x4b, 0xd8, 0x3c, 0x56, 0x34, 0x46, 0x4f,
0xa4,
0xd0, 0x01, 0x8b, 0x60, 0x0f, 0x70, 0x57, 0x3e, 0x06, 0x67, 0x02, 0x7a, 0xf8, 0x8c, 0x80,
0xe8,
0xc3, 0xfd, 0x0a, 0x3a, 0xa7, 0x73, 0xb0, 0x4d, 0x99, 0xa2, 0xf1, 0xfb, 0x5a, 0xc7, 0xc2,
0x17,
0x96, 0x71, 0xba, 0x2a, 0xa9, 0x9a, 0xf3, 0x87, 0xea, 0x8e, 0x09, 0x9e, 0xb9, 0x47, 0xd4,
0x97,
0xe4, 0xb3, 0xbc, 0x58, 0x53, 0x5f, 0x2e, 0x21, 0xd1, 0x1a, 0xee, 0x2c, 0x64, 0x95, 0xf2,
0xb8,
0xc6, 0x33, 0x8d, 0x2b, 0x1f, 0xf7, 0x25, 0xad, 0xff, 0x7f, 0x39, 0xa8, 0xbf, 0x6a, 0x91,
0x79,
0xed, 0x20, 0x7b, 0xa1, 0xbb, 0x45, 0x69, 0xcd, 0xdc, 0xe7, 0x31, 0xaa, 0xf0, 0x65, 0xd7,
0xa0,
0x32, 0x93, 0xb1, 0x24, 0xd6, 0x5b, 0x9f, 0x27, 0x42, 0x85, 0x07, 0x44, 0x3f, 0xb4, 0x11,
0x68,
0x5e, 0x49, 0x29, 0x13, 0x94, 0xe6, 0x1b, 0xe1, 0x7d, 0xc8, 0x2f, 0xfa, 0x78, 0x1d, 0xe3,
0xde,
0x50, 0x4e, 0x89, 0xb6, 0x30, 0x48, 0x0c, 0x10, 0x05, 0x43, 0xce, 0xd3, 0x61, 0x51, 0x83,
0xda,
0x77, 0x6f, 0x92, 0x9d, 0x74, 0x7c, 0x04, 0x88, 0x86, 0x55, 0xca, 0xf4, 0xc1, 0x62, 0x0e,
0x28,
0xb7, 0x0b, 0xc0, 0xf5, 0xcf, 0x35, 0xc5, 0x4c, 0x16, 0xe0, 0x98, 0x00, 0x9b, 0xd9, 0xae,
0x03,
0xaf, 0xec, 0xc9, 0xdb, 0x6d, 0x3b, 0x26, 0x75, 0x3d, 0xbd, 0xb2, 0x4a, 0x5d, 0x6c, 0x72,
0x40,
0x7e, 0xab, 0x59, 0x52, 0x54, 0x9c, 0xd2, 0xe9, 0xef, 0xdd, 0x37, 0x1e, 0x8f, 0xcb, 0x8a,
0x90,
0xfc, 0x84, 0xe5, 0xf9, 0x14, 0x19, 0xdf, 0x6e, 0x23, 0xc4, 0x66, 0xeb, 0xcc, 0x22, 0x1c,
0x5c };
encode(buf,len,offset)
unsigned char * buf; unsigned int len, offset;
{ unsigned int i;
for (i=0; i<len; i++) {
buf[i] = kod[buf[i]] - (unsigned char) i - (unsigned char) offset;
}
}
/* long inrec(i_base, p_rec, sistN)
—⥨Ґ Ё§ i_base (㬥а жЁп б 1) § ЇЁбЁ б бЁбвҐ¬л¬ ®¬Ґа®¬ sistN
Ё гбв ®ўЄ гЄ § ⥫п p_rec ҐҐ з «®.
‚®§ўа й Ґвбп ¤«Ё бзЁв ®© § ЇЁбЁ.
…б«Ё § ЇЁбм г¤ «Ґ , в® ў®§ўа й Ґвбп ҐҐ ¤«Ё б ®ваЁж ⥫мл¬ § Є®¬.
‚ б«гз Ґ ®иЁЎЄЁ ў®§ўа й Ґвбп 0.
*/
long inrec(i_base, p_rec, sistN)
int i_base; unsigned char ** p_rec; long sistN;
{
unsigned char * buf;
long offset1, offset2;
unsigned int len1, len2;
i_base--;
if (bank_stru==NULL) if (get_stru()<0) return(0);
if ( (bank_stru[i_base].fd==-1)|(bank_stru[i_base].fi==-1) )
if (datopen(i_base+1)<0) return(0);
lseek(bank_stru[i_base].fi,sistN*12L-4L,SEEK_SET);
if (read(bank_stru[i_base].fi,&offset1,4)!=4) return(0);
read(bank_stru[i_base].fi,&len1,2);
read(bank_stru[i_base].fi,&offset2,4);
read(bank_stru[i_base].fi,&len2,2);
if (len1==0)
if((len2==0)|len2==0xffff)) return(0);
lseek(bank_stru[i_base].fd,offset1,SEEK_SET);
buf=(unsigned char *) malloc(len1+1+((len2==0xffff)?0:len2));
if (buf==NULL) return(0);
read(bank_stru[i_base].fd,buf,len1);
while ((len2!=0)&&(len2!=0xffff)) {
lseek(bank_stru[i_base].fd,offset2,SEEK_SET);
read(bank_stru[i_base].fd,&offset2,4);
read(bank_stru[i_base].fd,buf+len1,(len2>252)?252:len2);
if (len2>252) { len1+=252; len2-=252; }
else { len1+=len2; len2=0; }
}
encode(buf,len1,sistN);
buf[len1]='\0';
*p_rec=buf;
if (len2==0xffff) return( -((long) len1) );
return( (long) len1 );
}
#define FIELD 0xfe
#define SFIELD 0xfd
/* ђ бзҐв Є®«ЁзҐбвў Ї®¤Ї®«Ґ© Ї®«п i_field (㬥а жЁп б 1) */
int sub_fields(buf,i_field)
unsigned char * buf; int i_field;
{ int i,len,ret=0;
len=strlen(buf); i_field--;
for (i=0; (i<len)&&(i_field>0); i++) {
if (buf[i]==FIELD) i_field--;
}
if ((buf[i]!=FIELD)&&(i<len)) ret++;
for ( ; (i<len)&&(buf[i]!=FIELD); i++)
if (buf[i]==SFIELD ) ret++;
return(ret);
}
/*‚®§ўа й Ґв гЄ § вҐ«м Ї®¤Ї®«Ґ s_fld Ї®«п fld § ЇЁбЁ buf
(ўбп 㬥а жЁп б 1). ‚ s_len ў®§ўа й Ґвбп ¤«Ё нв®Ј® Ї®¤Ї®«п.*/
unsigned char * field(buf,fld,s_fld,s_len)
int fld, s_fld, *s_len; unsigned char buf[];
{ int i,j,len;
len=strlen(buf); fld--; s_fld--; *s_len=0;
for (i=0; (i<len)&&(fld>0); i++) {
if (buf[i]==FIELD) fld--;
}
for ( ; (i<len)&&(s_fld>0)&&(buf[i]!=FIELD); i++) {
if (buf[i]==SFIELD) s_fld--;
}
if((i>=len)|s_fld>0)) return(NULL);
for (j=i; (i<len)&&(buf[i]!=FIELD)&&(buf[i]!=SFIELD); i++);
if ((*s_len=i-j)==0) return(NULL);
return(&buf[j]);
}
long invert(l)
long l;
{ long ll;
char * c1, *c2;
c1=(char*)&l; c2=(char*)((&ll)+1);
(--c2)=c1++);
(--c2)=c1++);
(--c2)=c1++);
(--c2)=c1++);
return(ll);
}
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