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my_format.c
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my_format.c
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#include"fs.h"
#include"tool.h"
#include<stdlib.h>
#include<string.h>
#include<ctype.h>
/* 存在随机根目录dir乱码 原因不明 */
/*
接受一个参数 不得小于256MB 不得大于2097152MB(2TB)
默认一个磁盘块512B 一簇4KB 8个块
*/
#define MIN 256
#define MAX 2097152
//单位字节
void vhdset(HD_FTRp vhd,u64 size){
strcpy(vhd->cookie,"conectix");
vhd->features=BigtoLittle32(0x00000002);
vhd->ff_version=BigtoLittle32(0x00010000);
vhd->data_offset=BigtoLittle64(0xFFFFFFFFFFFFFFFF);
vhd->timestamp=0x00000000;
strcpy(vhd->crtr_app,"myfs");
vhd->crtr_ver=BigtoLittle32(0x00060001);
// strcpy((char*)vhd->crtr_os,"Wi2k");
vhd->crtr_os=BigtoLittle32(0x5769326b);
vhd->orig_size=BigtoLittle64(size);
vhd->curr_size=BigtoLittle64(size);
vhd->geometry=BigtoLittle32(0x03eb0c11);
vhd->type=BigtoLittle32(2); //类型
vhd->checksum=0;
// strcmp(vhd->uuid," ");
memset(vhd->uuid,0xff,sizeof(vhd->uuid));
memset(vhd->reserved,0,sizeof(vhd->reserved));
u32 chksum=0;
u8* p=(u8*)vhd;
for(int i=0;i<512;i++){
chksum+=p[i];
}
vhd->checksum=BigtoLittle32(~chksum);
}
//size为字节数
void MBRset(MBRp mbr,int size){
mbr->sign=0x12345678;
(mbr->mbr_in[0]).flag=0;
(mbr->mbr_in[0]).FSflag=0x0b;
mbr->mbr_in[0].strart_chan=0x00000008;
mbr->mbr_in[0].all=size/BLOCKSIZE-mbr->mbr_in[0].strart_chan;
mbr->end=0xAA55;
}
void FSInfoset(FSInfop fsi){
memset(fsi,0,BLOCKSIZE);
fsi->FSI_LeadSig=0x41615252;
fsi->FSI_StrucSig=0x61417272;
fsi->FSI_Free_Count=0xff;
fsi->FSI_Nxt_free=0xFFFFFFFF;
fsi->end=0xAA550000;
}
//size 为字节数
void BS_BPSset(BS_BPBp bs_bpb,int size,int hiden){
my_strcpy(bs_bpb->BS_jmpBoot,"\xEB\x58\x90",sizeof(bs_bpb->BS_jmpBoot));
my_strcpy(bs_bpb->BS_OEMName,"MSDOS5.0",sizeof(bs_bpb->BS_OEMName));
bs_bpb->BPB_BytsPerSec=512;
bs_bpb->BPB_SecPerClus=8;//
bs_bpb->BPB_RsvdSecCnt=32;
bs_bpb->BPB_NumFATs=2;
bs_bpb->BPB_RootEntCnt=0;
bs_bpb->BPB_TotSec16=0;
bs_bpb->BPB_Media=0xf8;
bs_bpb->BPB_FATSz16=0;
bs_bpb->BPB_SecPerTrk=0x3f;
bs_bpb->BPB_NumHeads=0xff;
bs_bpb->BPB_HiddSec=hiden;
bs_bpb->BPB_TotSec32=size/BLOCKSIZE;
int x=size/SPCSIZE/(512/4);
bs_bpb->BPB_FATSz32=x+(8-x%8);//强制4k对齐
bs_bpb->BPB_ExtFlags=0;
bs_bpb->BPB_FSVer=0;
bs_bpb->BPB_RootClis=2;
bs_bpb->BPB_FSInfo=1;
bs_bpb->BPB_BkBootSec=6;
memset(bs_bpb->BPB_Reserved,0,sizeof(bs_bpb->BPB_Reserved));
bs_bpb->BS_DrvNum=0x80;
bs_bpb->BS_Reserved1=0;
bs_bpb->BS_BootSig=0x29;
// char BS_VolID[4];
my_strcpy(bs_bpb->BS_VolLab,"NO NAME ",11);
my_strcpy(bs_bpb->BS_FilSysType,"FAT32 ",8);
bs_bpb->end=0xAA55;
}
int my_format(const ARGP arg){
char fatName[8]="WLt ";
char fileName[ARGLEN]="fs.vhd";
const char helpstr[]=
"\
功能 格式化文件系统\n\
语法格式 format size [name [namefile]]\n\
szie 磁盘大小 单位MB\n\
name 卷标名 默认 WTL\n\
namefile 虚拟磁盘文件路径(当前目录下开始) 默认 fs.vhd\n";
DEBUG("%d",sizeof(BS_BPB));
BLOCK4K block4k;
FILE *fp=NULL;
switch(arg->len){
case 3:
my_strcpy(fileName,arg->argv[2],ARGLEN);
case 2:
my_strcpy(fatName,arg->argv[1],8);
case 1:
if(strcmp(arg->argv[0],"/?")==0 && arg->len==1){
printf(helpstr);
return SUCCESS;
}else{
break;
}
break;
default:
strcpy(error.msg,"参数数量错误\n\x00");
printf("参数数量错误\n");
return ERROR;
}
// if(arg->len>3){
// strcpy(error.msg,"参数数量错误\n\x00");
// printf("参数数量错误\n");
// return ERROR;
// }
DEBUG("%s %d",arg->argv[0],ctoi(arg->argv[0]));
int size=ctoi(arg->argv[0]);
if(size<MIN||size>MAX){
strcpy(error.msg,"磁盘容量量错误\n\x00");
printf("磁盘容量量错误\n");
return ERROR;
}
int cut=size*K*K/SPCSIZE;
DEBUG("%d %d\n",sizeof(BLOCK),sizeof(BLOCK4K));
fp=fopen(fileName,"wb");
if(fp==NULL){
strcpy(error.msg,"文件打开错误\n\x00");
printf("文件打开量错误\n");
return ERROR;
}
//生成文件本体
memset(&block4k,0,SPCSIZE);
for(int i=0;i<cut;i++){
do_write_block4k(fp,&block4k,-1);
}
//处理vhd格式
HD_FTR vhd;
vhdset(&vhd,size*K*K);
do_write_block(fp,(BLOCK*)&vhd,-1,0);
//磁盘分区
MBR mbr;
MBRset(&mbr,size*K*K);
do_write_block(fp,(BLOCK*)&mbr,0,0);
//fatBPB
BS_BPB bs_pbp;
BS_BPSset(&bs_pbp,
size*K*K-mbr.mbr_in[0].strart_chan*BLOCKSIZE,
mbr.mbr_in[0].strart_chan);
do_write_block(fp,(BLOCK*)&bs_pbp,mbr.mbr_in[0].strart_chan*BLOCKSIZE/SPCSIZE,(mbr.mbr_in[0].strart_chan*BLOCKSIZE%SPCSIZE)/BLOCKSIZE);
//初始化根目录
int start=bs_pbp.BPB_FATSz32*bs_pbp.BPB_NumFATs+bs_pbp.BPB_RsvdSecCnt+mbr.mbr_in[0].strart_chan+(bs_pbp.BPB_RootClis-2)*bs_pbp.BPB_SecPerClus;
DEBUG("开始扇区 %d\n",start);
BLOCK block;
FAT_DSp fatdsp=(FAT_DSp)█
memset(fatdsp,0,sizeof(FAT_DS));
my_strcpy(fatdsp->name,fatName,8);
my_strcpy(fatdsp->named," ",3);
fatdsp->DIR_Attr=ATTR_VOLUME_ID;
do_write_block(fp,&block,start/8,start%8);
FSInfo fsi;
FSInfoset(&fsi);
// do_write_block(fp,(BLOCK*)&bs_pbp,mbr.mbr_in[0].strart_chan*BLOCKSIZE/SPCSIZE,(mbr.mbr_in[0].strart_chan*BLOCKSIZE%SPCSIZE)/BLOCKSIZE);
do_write_block(fp,(BLOCK*)&fsi,mbr.mbr_in[0].strart_chan*BLOCKSIZE/SPCSIZE,(mbr.mbr_in[0].strart_chan*BLOCKSIZE%SPCSIZE)/BLOCKSIZE+1);
//fat设置 (根目录初始化)
int str_fat1;
str_fat1=bs_pbp.BPB_RsvdSecCnt+mbr.mbr_in[0].strart_chan;
int str_fat2=bs_pbp.BPB_RsvdSecCnt+bs_pbp.BPB_FATSz32+mbr.mbr_in[0].strart_chan;
DEBUG("%d %d\n",str_fat1,str_fat2);
FAT fat;
fat.fat[0]=0x0ffffff8;
for(u32 i=1;i<=bs_pbp.BPB_RootClis;i++){
fat.fat[i]=FAT_END;
}
// fat.fat[bs_pbp.BPB_RootEntCnt]=
do_write_block(fp,(BLOCK*)&fat,str_fat1/8,str_fat1%8);
do_write_block(fp,(BLOCK*)&fat,str_fat2/8,str_fat2%8);
fclose(fp);
DEBUG("磁盘申请成功\n");
// if()
return SUCCESS;
}