int32_t ext4_fill_file(const struct ext4_super_block *sb, const struct ext4_extent *ext, size_t size, uint8_t *buf)
{
int32_t blk_sz = 0;
__le64 offset = 0;
int32_t ret = 0;
ret = ext4_fill_blk_sz(sb, &blk_sz);
if (ret != 0) {
return -1;
}
offset = (((__le64)ext->ee_start_hi << 32) | (__le64)ext->ee_start_lo) * blk_sz;
ret = io_fseek(offset);
if (ret != 0) {
return -1;
}
ret = io_fread((uint8_t *)buf, size);
if (ret != 0) {
return -1;
}
return 0;
}
/*
* Function Definition
*/
int32_t fat_fill_file(const struct fat_super_block *sb, int32_t cluster, size_t size, uint8_t *buf)
{
int32_t sector = 0;
int32_t offset = 0;
int32_t ret = 0;
ret = fat_fill_clus2sec(sb, cluster, §or);
if (ret != 0) {
return -1;
}
offset = sector * (int32_t)GET_UNALIGNED_LE16(sb->bs.sector_size);
ret = io_fseek(offset);
if (ret != 0) {
return -1;
}
ret = io_fread(buf, size);
if (ret != 0) {
return -1;
}
return 0;
}
int packOpen(const char* filename)
{
packItem* temp = NULL;
temp = fileItem;
if(fileItem==NULL) return -1;
while( strcmp(filename,(char*)temp->date.name) ) {
temp = temp->next;
if(temp==NULL)
return -1; }
io_fseek(fd,temp->date.offset,IO_SEEK_SET);
return fd;
}
int packOpenAsync(const char* filename)
{
int fd = -1;
packItem* temp = NULL;
temp = fileItem;
if(fileItem==NULL) return -1;
while( strcmp(filename,(char*)temp->date.name) ) {
temp = temp->next;
if(temp==NULL)
return -1; }
fd = io_fopen(name,IO_RDONLY);
io_fseek(fd,temp->date.offset,IO_SEEK_SET);
return fd;
}
int packInit(const char* filename)
{
int i = 0;
packItem* temp = NULL;
packCleanRes();
fd = io_fopen(filename,IO_RDONLY);
if(fd <= 0)
return -1;
fileInfo = (packInfo*) safe_malloc (sizeof(packInfo));
io_fseek(fd,(int)(-sizeof(packInfo)),IO_SEEK_END);
io_fread(fileInfo,sizeof(packInfo),1,fd);
if(fileInfo->VER!=0x01000000) { // 如果不是pack压缩包则取消读取
packCleanRes();
return -1; }
io_fseek(fd,(int)(-(sizeof(packInfo)+sizeof(packDate)*fileInfo->nums)),IO_SEEK_END);
for(i=0;i<fileInfo->nums;i++)
{
if(fileItem==NULL) {
fileItem = (packItem*) safe_malloc (sizeof(packItem));
temp = fileItem;
io_fread(&temp->date,sizeof(packDate),1,fd);
temp->next = NULL; }
if((i!=0) && (temp->next==NULL)) {
temp->next = (packItem*) safe_malloc (sizeof(packItem));
temp = temp->next;
io_fread(&temp->date,sizeof(packDate),1,fd);
temp->next = NULL; }
}
if(name==NULL) {
name = (char*) safe_malloc (strlen(filename));
strcpy(name,filename); }
//rewind((FILE*)fd);
io_fseek(fd,0,IO_SEEK_SET);
//printf("first fd address: 0x%x\n",fd);
return fd;
}
int32_t fat_fill_sb(struct fat_super_block *sb)
{
int32_t offset = 0;
size_t sz = 0;
int32_t is_fat32_fs = 0;
int32_t ret = 0;
/*
* Fill in FAT boot sector
*/
offset = 0;
ret = io_fseek(offset);
if (ret != 0) {
return -1;
}
sz = sizeof(struct fat_boot_sector);
ret = io_fread((uint8_t *)&sb->bs, sz);
if (ret != 0) {
memset((void *)&sb->bs, 0, sz);
return -1;
}
if (!fat_is_valid_sec_sz((uint8_t *)sb->bs.sector_size, 2)
|| !IS_POWER_OF_2(sb->bs.sec_per_clus)
|| sb->bs.reserved == 0
|| sb->bs.fats == 0
|| !fat_is_valid_media((uint32_t)sb->bs.media)) {
return -1;
}
ret = fat_is_fat32_fs((const struct fat_super_block *)sb, &is_fat32_fs);
if (ret != 0) {
return -1;
}
/*
* Fill in FAT boot bsx
*/
if (is_fat32_fs) {
offset = FAT32_BSX_OFFSET;
} else {
offset = FAT16_BSX_OFFSET;
}
ret = io_fseek(offset);
if (ret != 0) {
return -1;
}
sz = sizeof(struct fat_boot_bsx);
ret = io_fread((uint8_t *)&sb->bb, sz);
if (ret != 0) {
memset((void *)&sb->bb, 0, sz);
return -1;
}
if (is_fat32_fs) {
/*
* Fill in FAT32 boot fsinfo
*/
offset = sb->bs.info_sector == 0 ? GET_UNALIGNED_LE16(sb->bs.sector_size) : sb->bs.info_sector * GET_UNALIGNED_LE16(sb->bs.sector_size);
ret = io_fseek(offset);
if (ret != 0) {
return -1;
}
sz = sizeof(struct fat_boot_fsinfo);
ret = io_fread((uint8_t *)&sb->bf, sz);
if (ret != 0) {
memset((void *)&sb->bf, 0, sz);
return -1;
}
if (sb->bf.signature1 != FAT_FSINFO_SIG1 || sb->bf.signature2 != FAT_FSINFO_SIG2) {
return -1;
}
}
return 0;
}
