/*
* Writes buf into cluster, buf should be holding a cluster's worth of data,
* that is it should have been allocated to size cluster_size(cluster).
*
* @param cluster cluster to write to
* @param *buf buffer holding the data to write
*
* @return 0 if successful, otherwise -1
*/
static int ll_fd_write(int cluster, char *buf) {
int offset = ctobpos(cluster);
int size = cluster_size(cluster);
if (lseek(fd, offset, SEEK_SET) != offset) return -1;
if (write(fd, buf, size) != size) return -1;
return 0;
}
int read_content(char *dst, char *src, size_t cnt, unsigned int cluster)
{
int clustersize;
char *vptr;
//char *k;
//k = calloc(cnt + 1, 1);
clustersize = cluster_size(src);
vptr = cluster_addr(src, cluster);
printf("[read_content] cluster=%d,clustersize=%d, cnt=%d, offset=%x\n", cluster, clustersize, cnt, vptr - src);
//memcpy(k, vptr, cnt);
memcpy(dst, vptr, cnt);
//printf(stderr, "%s",k);
//free(k);
return cnt;
}
char * cluster_addr(char *baseaddr, int cluster)
{
return cluster_2(baseaddr) + (cluster - 2) * cluster_size(baseaddr);
}
char * do_job(int *fsize, char *inbuf)
{
/*int fs_type;*/
char *fat_base;
char *entrys, *entry;
int cluster;
int filesize ;
char *name;
char *fbuf;
int cnt, ret;
char *pret;
// debug
ret = mbr_sector_size(inbuf);
printf(" [mbr_sector_size] = %u\n", ret);
pret = mbr_fat(inbuf);
printf(" [mbr_fat] base=0x%x, fat=0x%x, offset=%d\n", (unsigned int)inbuf, (unsigned int)pret, pret - inbuf);
ret = mbr_fat_cnt(inbuf);
printf(" [mbr_fat_cnt] ret=%u\n", (unsigned)ret);
ret = mbr_sectors_peer_fat(inbuf);
printf(" [mbr_sectors_peer_fat] ret=%u\n", (unsigned)ret);
ret = mbr_sectors_peer_cluster(inbuf);
printf(" [mbr_sectors_peer_cluster] = %u\n", (unsigned)ret);
pret = mbr_entrys(inbuf);
printf(" [mbr_entrys] base=0x%x, entrys=0x%x, offset=%d\n", (unsigned int)inbuf, (unsigned int)pret, pret - inbuf);
// debug end
// get fat,entry 's address
fat_base = mbr_fat(inbuf);
printf("fat_base=%d\n", (unsigned)(fat_base - inbuf));
entrys = mbr_entrys(inbuf);
printf("entrys=%d\n", (unsigned)(entrys - inbuf));
// value init
cluster = -1;
filesize = 0;
// find uboot entry
entry = entrys;
while ( entry_is_null(entry) != 1) {
name = entry_name(entry);
if (strncmp(name, "UBOOT", 5) == 0) {
printf("-------------get uboot------------\n");
cluster = entry_cluster(entry);
filesize = entry_fsize(entry);
break;
}
entry = entry_next_entry(entry);
printf(" entry =%d\n", (entry - entry));
}
if (cluster == -1) {
printf("can't find file: UBOOT\n");
return NULL;
}
printf("begin read file\n");
// read uboot
fbuf = malloc(filesize);
cnt = 0;
while (is_endofile(cluster) != 1) {
cnt += read_content(fbuf + cnt, inbuf, min(filesize - cnt, cluster_size(inbuf)), cluster);
cluster = next_cluster(fat_base, cluster);
}
*fsize = filesize;
return fbuf;
}
