diskfs_ino_t lookup(diskfs_sb_t *sb, diskfs_inode_t *inode, char *name) {
diskfs_dirent_t *dirents = (diskfs_dirent_t *) buffer;
int32_t dirents_per_block = sb->block_size/sizeof(diskfs_dirent_t);
int32_t i = 0; /* counter for blocks. */
int32_t j = 0; /* counter for dirents per block. */
/* loop on dirents. */
while(1) {
/* beginning of a new block? */
if (j == 0)
read_file_block(sb, inode, i++, buffer);
/* done? */
if (dirents[j].ino == 0)
return 0;
/* name matching? */
if (dirents[j].ino > 1 && !strcmp(dirents[j].name, name))
return dirents[j].ino;
/* next dirent: */
if (++j == dirents_per_block)
j = 0;
}
}
void diskfs_loadfile(char *path, uint32_t base) {
/* counter */
int32_t i = 0, j = 0;
/* root inode: */
diskfs_ino_t ino = DISKFS_ROOT_INO;
diskfs_inode_t inode;
/* loop on path components */
while (path[i]) {
/* Read name: */
char name[32] = {0};
j = 0;
while (path[i] == '/')
i++; /* skip slash. */
while (path[i] != 0 && path[i] != '/')
name[j++] = path[i++];
if (name[0] == 0)
continue;
/* look for the name inside the hierarchy: */
read_inode(sb, &inode, ino);
if (!(ino = lookup(sb, &inode, name))) {
/* not found! */
printf("%s is missing.\n", path);
while(1);
}
}
/* load kernel */
printf("Loading %s (inode %d) to 0x%x...", path, ino, base);
read_inode(sb, &inode, ino);
for (i = 0; i < inode.blocks; i++) {
uint8_t *dest = (uint8_t *)(base+i*sb->block_size);
read_file_block(sb,&inode, i, buffer);
for (j = 0; j < sb->block_size; j++)
dest[j] = buffer[j];
}
printf(" done\n");
}
void diskfs_load(char *path, uint32_t base) {
/* Get superblock */
diskfs_sb_t *sb = (diskfs_sb_t *)(DISK_BASE+512);
/* Read Root Inode: */
diskfs_ino_t ino = DISKFS_ROOT_INO;
diskfs_inode_t inode;
/* loop on path components */
int32_t i = 0;
while (path[i]) {
/* Read name: */
char name[32] = {0};
int32_t j = 0;
while (path[i] == '/')
i++; /* skip slash. */
while (path[i] != 0 && path[i] != '/')
name[j++] = path[i++];
if (name[0] == 0)
continue;
/* look for the name inside the hierarchy: */
read_inode(sb, &inode, ino);
if (!(ino = lookup(sb, &inode, name))) {
/* not found! */
printf("%s is missing.\n", path);
while(1);
}
}
/* load kernel */
printf("Loading %s (inode %d) to 0x%x...", path, ino, base);
read_inode(sb, &inode, ino);
for (i = 0; i < inode.blocks; i++)
read_file_block(sb,&inode,i,(void *)(base+i*sb->block_size));
printf(" done\n");
}