?? fat.c
字號:
DWORD cluster=0;
if(FAT32_Enable)cluster=FirstDirClust;
if(*p != '\\')return 1;//invalid path
while(*p)
{
if(*p == '\\')
{
deep++;
}
p++;
}
p=dir;
for(i=0;i<deep-1;i++)
{
p++;
for(j=0;j<11;j++)name[j]=0x20;
j=0;
while(*p != '\\')
{
if((*p) >= 'a' && (*p) <= 'z')name[j] = (*p++)-0x20;
else name[j] = *p++;
j++;
}
if(FAT_FindItem(cluster,name, &FileInfo))return 1;//find the directory
cluster = FileInfo.StartCluster;
}
p++;
for(j=0;j<11;j++)name[j]=0x20;
j=0;
while(*p != '.')//file must have a extention
{
if(*p>='a' && *p<='z')name[j]=(*p++)-0x20;
else name[j]=*p++;
j++;
}
j=8;
p++;
while(*p)
{
if(*p>='a' && *p<='z')name[j]=(*p++)-0x20;
else name[j]=*p++;
j++;
}
if(FAT_FindItem(cluster,name, &FileInfo))return 1;//find the file
cluster = FileInfo.StartCluster;
return cluster;
}
// find a directory with the given path
unsigned long FAT_OpenDir(BYTE * dir)
{
BYTE name[11];
BYTE *p=dir;
BYTE deep=0;
BYTE i,j;
DWORD cluster=0;
if(FAT32_Enable)cluster = FirstDirClust;
if(*p != '\\')return 1;//invalid path
while(*p)
{
if(*p == '\\')
{
deep++;
}
p++;
}
p=dir;
for(i=0;i<deep-1;i++)
{
p++;
for(j=0;j<11;j++)name[j]=0x20;
j=0;
while(*p != '\\')
{
if((*p) >= 'a' && (*p) <= 'z')name[j] = (*p++)-0x20;
else name[j] = *p++;
j++;
}
if(FAT_FindItem(cluster,name, &FileInfo))return 1;//find the directory
cluster = FileInfo.StartCluster;
}
p++;
for(j=0;j<11;j++)name[j]=0x20;
j=0;
while(*p)
{
if(*p>='a' && *p<='z')name[j]=(*p++)-0x20;
else name[j]=*p++;
j++;
}
if(j == 0)return cluster;
if(FAT_FindItem(cluster,name, &FileInfo))return 1;//find the final directory
cluster = FileInfo.StartCluster;
return cluster;
}
unsigned int FAT_Close(unsigned long * p)
{
*p=1;
return 0;
}
// Output the data of a file
// size 0 means read all of the file
unsigned char FAT_Read(unsigned long pointer, unsigned long size)
{
DWORD sector;
DWORD tempclust=pointer;
BYTE *buffer;
unsigned int i=0,j=0;
sector=(DWORD)FirstDataSector+(DWORD)(tempclust-2)*(DWORD)SectorsPerClust;
if(size==0)size = FileInfo.Size;//whether need to read all
USART_putchar(0x0d);
USART_putchar(0x0a);//new line
while(size)
{
buffer=malloc(512);
if(FAT_ReadSector(sector+j,buffer)){free(buffer);return 1;}
if(size<=512)
{
for(i=0;i<size;i++)
{
USART_putchar(buffer[i]);//output
}
free(buffer);
return 0;//file over
}
else
{
for(i=0;i<512;i++)
{
USART_putchar(buffer[i]);
}
j++;
if(j==SectorsPerClust)
{
j=0;
free(buffer);
tempclust=FAT_NextCluster(tempclust);//find the next cluster the data was stored
if((FAT32_Enable == 0 && tempclust == 0xffff) || tempclust == 0x0ffffff8 || tempclust == 0x0fffffff)return 1;//error
sector=(DWORD)FirstDataSector+(DWORD)(tempclust-2)*(DWORD)SectorsPerClust;//reculculate the sector
}
else free(buffer);
size-=512;
}
}
return 0;
}
// write data to a file
unsigned char FAT_Write(unsigned long cluster,unsigned char *data,unsigned long size)
{
BYTE buffer[512];
DWORD sector;
unsigned int i;
for(i=0;i<size;i++)
{
buffer[i]=data[i];
}
sector=(DWORD)FirstDataSector+(DWORD)(cluster-2)*(DWORD)SectorsPerClust;
if(FAT_WriteSector(sector,buffer))return 1;//write the data
return 0;
}
//Delete a file
unsigned char FAT_Delete(BYTE *dir)
{
// BYTE *buffer;
// struct direntry *item;
// WORD cluster;
if(FAT_Open(dir)==0)return 1;//open the file
if(FAT_DelItem(&FileInfo))return 1;//delete it
return 0;
}
//Delete an item
unsigned char FAT_DelItem(struct FileInfoStruct *FileInfo)
{
BYTE *buffer;
struct direntry *item;
DWORD cluster;
DWORD tempclust;
buffer=malloc(512);
if(buffer==0)return 1;
if(FAT_ReadSector(FileInfo->Sector,buffer)){free(buffer);return 1;}
item=(struct direntry *)(&buffer[FileInfo->Offset]);
item->deName[0]=0xe5;//mark it was deleted
if(FAT_WriteSector(FileInfo->Sector,buffer)){free(buffer);return 1;}
free(buffer);
cluster=FileInfo->StartCluster;
if(FileInfo->Attr & 0x10)//if the item is a folder
{
while(1)
{
while(FAT_SelectOneItem(cluster,FileInfo)==0)
{
if(FAT_DelItem(FileInfo))return 1;//nest for deleting folder
}
tempclust=FAT_NextCluster(cluster);//if the folder contain many item
if(tempclust==1)return 1;
if(FAT_ModifyFAT(cluster,0))return 1;//release the fat table
cluster=tempclust;
if(cluster == 0x0ffffff8)return 1;//error
if((FAT32_Enable == 0 && tempclust == 0xffff) || tempclust == 0x0fffffff)break;//the end of the directory
}
}
else// the item is a file
{
while(1)
{
tempclust=FAT_NextCluster(cluster);//save the next cluster
if(tempclust==1)return 1;
if(FAT_ModifyFAT(cluster,0))return 1;//delete curent cluster
cluster=tempclust;
//tempclust=FAT_NextCluster(cluster);
if(cluster == 0x0ffffff8)return 1;//error
if((FAT32_Enable == 0 && tempclust == 0xffff) || tempclust == 0x0fffffff)break;//the end of the file
}
//if(FAT_ModifyFAT(cluster,0))return 1;//delete the final cluster
}
return 0; //done
}
//Rename a directory or a file
unsigned char FAT_Rename(BYTE *dir,BYTE *newname)
{
BYTE name[11];
BYTE *p=dir;
BYTE deep=0;
BYTE i,j;
// BYTE directory=0;
DWORD cluster=0;
BYTE *buffer;
struct direntry *item;
if(FAT32_Enable)cluster=FirstDirClust;
if(*p != '\\')return 1;//invalid path
while(*p)
{
if(*p == '\\')
{
deep++;
}
p++;
}
p=dir;
for(i=0;i<deep-1;i++)
{
p++;
for(j=0;j<11;j++)name[j]=0x20;
j=0;
while(*p != '\\')
{
if((*p) >= 'a' && (*p) <= 'z')name[j] = (*p++)-0x20;
else name[j] = *p++;
j++;
}
if(FAT_FindItem(cluster,name, &FileInfo))return 1;
cluster = FileInfo.StartCluster;
}
p++;
for(j=0;j<11;j++)name[j]=0x20;
j=0;
while((*p != '.') && (*p) )//compatalbe for folder and file
{
if(*p>='a' && *p<='z')name[j]=(*p++)-0x20;
else name[j]=*p++;
j++;
}
j=8;
if(*p == '.')//if it is a file
{
p++;
while(*p)
{
if(*p>='a' && *p<='z')name[j]=(*p++)-0x20;
else name[j]=*p++;
j++;
}
}
//else ;//It is a directory
if(FAT_FindItem(cluster,name, &FileInfo))return 1;//get the file or directory information
buffer=malloc(512);
if(buffer==0)return 1;
if(FAT_ReadSector(FileInfo.Sector,buffer)){free(buffer);return 1;}//read the item according the information
item=(struct direntry *)(&buffer[FileInfo.Offset]);
//modify the name
p=newname;
for(j=0;j<11;j++)item->deName[j]=0x20;
j=0;
while((*p != '.') && (*p))
{
if(*p>='a' && *p<='z')item->deName[j]=(*p++)-0x20;
else item->deName[j]=*p++;
j++;
}
j=8;
if(*p == '.')//if it is a file
{
p++;
while(*p)
{
if(*p>='a' && *p<='z')item->deName[j]=(*p++)-0x20;
else item->deName[j]=*p++;
j++;
}
}
if(FAT_WriteSector(FileInfo.Sector,buffer)){free(buffer);return 1;}//rewrite the item
free(buffer);
return 0;//done
}
//復制記錄項信息
void CopyDirentruyItem(struct direntry *Desti,struct direntry *Source)
{
BYTE i;
for(i=0;i<8;i++)Desti->deName[i] = Source->deName[i];
for(i=0;i<3;i++)Desti->deExtension[i] = Source->deExtension[i];
Desti->deAttributes = Source->deAttributes;
Desti->deLowerCase = Source->deLowerCase;
Desti->deCHundredth = Source->deCHundredth;
for(i=0;i<2;i++)Desti->deCTime[i] = Source->deCTime[i];
for(i=0;i<2;i++)Desti->deCDate[i] = Source->deCDate[i];
for(i=0;i<2;i++)Desti->deADate[i] = Source->deADate[i];
Desti->deHighClust = Source->deHighClust;
for(i=0;i<2;i++)Desti->deMTime[i] = Source->deMTime[i];
for(i=0;i<2;i++)Desti->deMDate[i] = Source->deMDate[i];
Desti->deStartCluster = Source->deStartCluster;
Desti->deFileSize = Source->deFileSize;
}
#if FIX_DIRECTORY
//search the file , when *count = 0 it will bring the number whole songs, when *cout != 0 the *MusicInfo will bring the infomation of the file
BYTE Search(BYTE *dir,struct direntry *MusicInfo,WORD *Count,BYTE *type)//當COUNT為零時，有它帶回這個目錄下總共有多少首音樂
{ //不為零時有MusicInfo帶回第Count首歌的詳細文件信息
BYTE *buffer;
//BYTE buff[3];
DWORD sector;
DWORD cluster;
DWORD tempclust;
unsigned char cnt;
unsigned int offset;
unsigned int i=0;
unsigned char j;//long name buffer offset;
unsigned char *p;//long name buffer pointer
struct direntry *item = 0;
struct winentry *we =0;
cluster = FAT_OpenDir(dir);
if(cluster == 1)return 1;
if(cluster==0 && FAT32_Enable==0)// root directory
{
buffer=malloc(512);//apply memory
if(buffer==0)return 1;//if failed
for(cnt=0;cnt<RootDirSectors;cnt++)
{
if(FAT_ReadSector(FirstDirSector+cnt,buffer)){free(buffer);return 1;}
for(offset=0;offset<512;offset+=32)
{
item=(struct direntry *)(&buffer[offset]);//pointer convert
//find a valid item and display it
if((item->deName[0] != '.') && (item->deName[0] != 0x00) && (item->deName[0] != 0xe5))
{
if(item->deAttributes == 0x0f)
{
we = (struct winentry *)(&buffer[offset]);
j = 26 *( (we->weCnt-1) & WIN_CNT);
if(j<MAX_LONG_NAME_SIZE-25)
{
p = &LongNameBuffer[j];
for (j=0;j<10;j++) *p++ = we->wePart1[j];
for (j=0;j<12;j++) *p++ = we->wePart2[j];
for (j=0;j<4;j++) *p++ = we->wePart3[j];
if (we->weCnt & 0x40) (*(unsigned int *)p) = 0;
if ((we->weCnt & WIN_CNT) == 1) LongNameFlag = 1;
}
LongNameBuffer[MAX_LONG_NAME_SIZE-1] = 0;
LongNameBuffer[MAX_LONG_NAME_SIZE-2] = 0;
/*p = &LongNameBuffer[j];
for (j=0;j<10;j++) *p++ = we->wePart1[j];
for (j=0;j<12;j++) *p++ = we->wePart2[j];
for (j=0;j<4;j++) *p++ = we->wePart3[j];
if (we->weCnt & 0x40) (*(unsigned int *)p) = 0;
if ((we->weCnt & WIN_CNT) == 1) LongNameFlag = 1; */
}
else if((item->deExtension[0] == 'M')&&(item->deExtension[1] == 'P')&&(item->deExtension[2] == '3'))
{
CopyDirentruyItem(MusicInfo,item);
*type=1;
i++;
if(i==*Count){free(buffer);return 0;}
else LongNameFlag = 0;
}
else if((item->deExtension[0] == 'W')&&(item->deExtension[1] == 'M')&&(item->deExtension[2] == 'A'))
{
CopyDirentruyItem(MusicInfo,item);
*type=2;
i++;
if(i==*Count){free(buffer);return 0;}
else LongNameFlag = 0;
}
else if((item->deExtension[0] == 'M')&&(item->deExtension[1] == 'I')&&(item->deExtension[2] == 'D'))
{
CopyDirentruyItem(MusicInfo,item);
*type=3;
i++;
if(i==*Count){free(buffer);return 0;}
else LongNameFlag = 0;
}
else if((item->deExtension[0] == 'W')&&(item->deExtension[1] == 'A')&&(item->deExtension[2] == 'V'))
{
CopyDirentruyItem(MusicInfo,item);
*type=4;
i++;
if(i==*Count){free(buffer);return 0;}
else LongNameFlag = 0;
}
else LongNameFlag = 0;
}
}
}
free(buffer);//release
}
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -