gint
sblb_block_data_file_read_raw (SBlbBlockDataFile *block_data_file, gint len, gpointer block_data, GError **error)
{
g_return_val_if_fail (SBLB_IS_BLOCK_DATA_FILE (block_data_file), -1);
g_return_val_if_fail (block_data != NULL, -1);
if (!ensure_file_is_open (block_data_file, error))
return -1;
return read_raw_block (block_data_file, len, block_data, error);
}
int isofs_read(const char *path,char *read_buf,size_t size,off_t offset)
{
log_msg("i am now in read_block\n");
struct iso_inode *inode = isofs_lookup(path);
if(!inode) {
fprintf(stderr,"no such file or directory found \n");
return -ENOENT;
}
if(ISO_FLAGS_DIR(inode->record->flags)) {
fprintf(stderr,"not a regular file may be a directory\n");
return -EINVAL;
}
int data_size = gvar->data_size;
struct iso_directory_record *dr = inode->record;
int start_block = isonum_733(dr->extent);
int end_block = isonum_733(dr->size)/data_size;
int in_block = end_block - start_block ;
int offset_block_start = offset / data_size;
int offset_block_end = (offset + size) / data_size;
int offset_shift_point = (offset%data_size);
int block = offset_block_start + start_block;
log_msg("malloced .....\n");
char *buf = (char *) malloc(data_size);
if(!buf) {
perror("isofs_read:cannot malloc");
exit(0);
}
int total = 0;
int count = 0;
int len;
do{
log_msg("read_raw_block.....\n");
len = read_raw_block(block,buf);
log_msg("buffer is now ....%s\n",buf);
memcpy(read_buf+count*data_size,buf+offset_shift_point,data_size);
log_msg("the read_buf is %s",read_buf);
offset_shift_point = 0;
count ++;
block++;
total += len;
}while(count <= in_block);
return total;
}
