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@DIR.CPP
// ----------------------------- @DIR.CPP -------------------------------
// Module chua cac thao tac tren bang DIR - Dung cho dia kich thuoc nho
// (chuong trinh co the duoc dich o model Small)
// De dung duoc mang DIR va cac ham tuong ung o module khac phai khai bao
// header_file DIR.H trong module do va include module nay vao project
// kem khai bao "DIRTABLE DIR"
// ----------------------------------------------------------------------
#include <dos.h>
#include <ctype.h>
#include <alloc.h>
#include <stdio.h>
#include <string.h>
#include "vheader.h"
#include "@disk.h"
#include "@dir.h"
// -------------------------------------------------------------------------
// Ham GetParam phan tich chuoi duong dan inSt va lay ra o dia drive, chuoi
// duong dan con lai duoc dua vao bien *outSt
// Vi du : inSt = "A:\HDH\DIR.CPP" ==> drive=0, outSt = "HDH\DIR.CPP"
// -------------------------------------------------------------------------
void GetParam(char *inSt, int &drive, char *&outSt)
{
if (inSt[1] == ':') {
drive = toupper(inSt[0]) - 'A'; // lay o dia
outSt = inSt + 2;
}
else drive = GetCurrentDrive(); // lay o dia hien hanh
if (outSt[0] == '\\') outSt++;
}
// -------------------------------------------------------------------------
// Ham ReadDIRfromFile doc noi dung bang thu muc da duoc luu tren file
// -------------------------------------------------------------------------
DIRENTRY * ReadDIR(int drive, WORD * DirSecList, BYTE SecPerDir)
{
int sec = 0;
DIRENTRY * DE = (DIRENTRY *)malloc(512*SecPerDir);
if (DE==NULL) return (NULL);
do { //doc moi lan 1 sector (~16 entry)
if (absread(drive,1,DirSecList[sec],DE+(512/sizeof(DIRENTRY))*sec)!=0) {
free(DE);
return (NULL);
}
sec++;
}
while (DirSecList[sec]!=NULL);
return (DE);
}
// -------------------------------------------------------------------------
// Ham ReadRootDir doc noi dung bang thu muc goc tren dia
// -------------------------------------------------------------------------
DIRTABLE ReadRootDir(int drive,int DirSec,int SecPerDir)
{
DIRTABLE DIR;
DIR.SecList = (WORD *)malloc((SecPerDir+1)*sizeof(WORD));
for (int i=0; i<SecPerDir; i++)
DIR.SecList[i] = DirSec + i;
DIR.SecList[i] = NULL; // phan tu cuoi danh sach
DIR.EntryList = ReadDIR(drive, DIR.SecList, SecPerDir);
return (DIR);
}
// ----------------------------------------------------------------------
// Ham ReadSubDir doc noi dung 1 bang thu muc con tren dia
// ----------------------------------------------------------------------
DIRTABLE ReadSubDir(int drive, int FirstClus, int SecPerClus,
int DATASec, FATTABLE FAT)
{
DIRTABLE DIR;
BYTE SecPerDir = 0;
long i,j,k = FirstClus;
// unsigned Mask = (FAT[1]==0xFFFF? 0xFFFF:0xFFF);
while (k != FAT[1]) { // FAT[1] = "EOF"
SecPerDir+=SecPerClus;
k = FAT[k];
}
DIR.SecList = (WORD*) malloc((SecPerDir+1)*sizeof(WORD));
i = 0;
k = FirstClus;
while (k != FAT[1]) {
for (j=0; j<SecPerClus; j++)
DIR.SecList[i++] = DATASec + (k-2)*SecPerClus + j;
k = FAT[k];
}
DIR.SecList[i] = NULL; // phan tu cuoi danh sach
DIR.EntryList = ReadDIR(drive, DIR.SecList, SecPerDir);
return (DIR);
}
// ----------------------------------------------------------------------
// Ham WriteDirEntry ghi entry i tren mang DIR vao bang thu muc tren dia
// ----------------------------------------------------------------------
BOOL WriteDirEntry(int drive, DIRTABLE DIR, int i)
{
int pos; // vi tri (sector) chua entry thu muc i can ghi
int EntryPerSec = 512/sizeof(DIRENTRY);
int sec = i/EntryPerSec; //chi so sector chua entry thu muc
pos = DIR.SecList[sec];
if (abswrite(drive,1,pos,(DIR.EntryList+(i/EntryPerSec)*EntryPerSec))!=0)
return FALSE;
return TRUE;
}
// ------------------------------------------------------------------------
// Ham SearchEntry tim trong bang thu muc DIR entry co ten chua trong chuoi
// pathfile. Neu pathfile la mot duong dan, chang han "BC31\BIN\BC.EXE" thi
// sau khi tim duoc entry "BC31" trong DIR, bang thu muc con cua "BC31" se
// duoc nap lai vao bien DIR va pathfile duoc cap nhat lai la "BIN\BC.EXE",
// cong viec cu tiep tuc cho den khi tim duoc entry cuoi "BC.EXE", DIR khi
// do la bang thu muc con chua entry tren (thu muc "BIN").
//* Gia tri tra ve cua ham la chi so cua entry tim duoc tren DIR, hoac (-1)
// neu khong co entry tuong ung.
// ------------------------------------------------------------------------
int SearchEntry(DIRTABLE &DIR, char *pathfile,int drive,
FATTABLE FAT,int DataSec,int SecPerClus )
{
char filename[11];
BYTE len, found;
WORD i,j,k,FirstClus;
do {
i = j = 0; len = strlen(pathfile); // lay EntryName tu pathfile
while (pathfile[i]=='.') // truong hop dac biet : thu muc la "." hoac ".."
filename[j++] = pathfile[i++];
while ((pathfile[i]!='.')&&(pathfile[i]!='\\')&&(i<len)) // va cap nhat lai
filename[j++] = toupper(pathfile[i++]); // pathfile chi den dau EntryName moi
while (j < 8) filename[j++] = ' ';
if (pathfile[i] == '.') i++;
while ((pathfile[i]!='\\')&&(i<len))
filename[j++] = toupper(pathfile[i++]);
while (j < 11) filename[j++] = ' ';
pathfile += i;
if (pathfile[0] == '\\') pathfile++;
k = 0; found = FALSE;
while (DIR.EntryList[k].Name[0]!=0 && !found) { // tim entry tuong ung
i=0;
while (DIR.EntryList[k].Name[i]==filename[i]) i++;
if (i==11) found = TRUE;
else k++;
}
if (!found) return(-1); // Entry not found!
FirstClus = DIR.EntryList[k].FirstCluster;
if (pathfile[0]!=NULL) { //tim tiep trong thu muc con
freeDIR(DIR);
DIR = ReadSubDir(drive,FirstClus,SecPerClus,DataSec,FAT) ;
}
}
while (pathfile[0]!=NULL);
return (k);
}
// -----------------------------------------------------------------------
// Ham SearchFreeEntry tim entry trong dau tien trong bang thu muc DIR va
// tra ve vi tri tim duoc /* can xu ly them trong truong hop khong co */
// -----------------------------------------------------------------------
int SearchFreeEntry(DIRTABLE DIR)
{
int i=0;
while (DIR.EntryList[i].Name[0]!=0)
if ((BYTE)(DIR.EntryList[i].Name[0])!=0xE5) i++;
else break;
return (i);
}
// ----------------------------------------------------------------------
// Ham freeDIR giai phong vung nho da cap phat
// ----------------------------------------------------------------------
void freeDIR(DIRTABLE DIR)
{
if (DIR.EntryList!=NULL) {
free(DIR.EntryList);
free(DIR.SecList);
}
return;
}