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Compressed metadata support

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-12-09 19:23:35 +01:00
parent 99f0735fb8
commit 76e39dc871
1 changed files with 44 additions and 30 deletions
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74
grub-core/fs/squash4.c
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@ -79,23 +79,19 @@ struct grub_squash_inode
grub_uint32_t size;
} __attribute__ ((packed));
static inline unsigned
decode_chunk_number (grub_uint16_t in)
{
return (grub_le_to_cpu16 (in) & 0xff) / 2;
}
/* Chunk-based. */
struct grub_squash_dirent_header
{
/* Actually the value is the number of elements - 1. */
grub_uint16_t nelems;
grub_uint16_t dummy[5];
grub_uint16_t dummy1;
grub_uint32_t ino_chunk;
grub_uint16_t dummy2[2];
};
struct grub_squash_dirent
{
grub_uint16_t ino;
grub_uint16_t ino_offset;
grub_uint16_t dummy;
grub_uint16_t type;
#define SQUASH_TYPE_DIR 1
@ -131,7 +127,7 @@ struct grub_fshelp_node
static grub_err_t
read_chunk (grub_disk_t disk, void *buf, grub_size_t len,
grub_uint64_t chunk, unsigned nchunk, grub_off_t offset)
grub_uint64_t chunk, grub_off_t offset)
{
grub_uint64_t chunk_start;
chunk_start = grub_le_to_cpu64 (chunk);
@ -147,12 +143,9 @@ read_chunk (grub_disk_t disk, void *buf, grub_size_t len,
sizeof (d), &d);
if (err)
return err;
if (!nchunk && offset < SQUASH_CHUNK_SIZE)
if (offset < SQUASH_CHUNK_SIZE)
break;
if (nchunk)
nchunk--;
else
offset -= SQUASH_CHUNK_SIZE;
offset -= SQUASH_CHUNK_SIZE;
chunk_start += 2 + (grub_le_to_cpu16 (d) & ~SQUASH_CHUNK_FLAGS);
}
@ -171,8 +164,29 @@ read_chunk (grub_disk_t disk, void *buf, grub_size_t len,
}
else
{
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"compression not implemented yet");
char *tmp;
grub_size_t bsize = grub_le_to_cpu16 (d) & ~SQUASH_CHUNK_FLAGS;
grub_disk_addr_t a = chunk_start + 2;
tmp = grub_malloc (bsize);
if (!tmp)
return grub_errno;
/* FIXME: buffer uncompressed data. */
err = grub_disk_read (disk, (a >> GRUB_DISK_SECTOR_BITS),
a & (GRUB_DISK_SECTOR_SIZE - 1),
bsize, tmp);
if (err)
{
grub_free (tmp);
return err;
}
if (grub_zlib_decompress (tmp, bsize, offset,
buf, csize) < 0)
{
grub_free (tmp);
return grub_errno;
}
grub_free (tmp);
}
len -= csize;
offset += csize;
@ -239,8 +253,8 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
grub_err_t err;
err = read_chunk (dir->data->disk, &dh, sizeof (dh),
dir->data->sb.diroffset,
decode_chunk_number (dir->ino.chunk), off);
grub_le_to_cpu64 (dir->data->sb.diroffset)
+ grub_le_to_cpu32 (dir->ino.chunk), off);
if (err)
return 0;
off += sizeof (dh);
@ -254,16 +268,16 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
struct grub_squash_inode ino;
err = read_chunk (dir->data->disk, &di, sizeof (di),
dir->data->sb.diroffset,
decode_chunk_number (dir->ino.chunk), off);
grub_le_to_cpu64 (dir->data->sb.diroffset)
+ grub_le_to_cpu32 (dir->ino.chunk), off);
if (err)
return 0;
off += sizeof (di);
err = read_chunk (dir->data->disk, &ino, sizeof (ino),
dir->data->sb.inodeoffset,
0,
grub_cpu_to_le16 (di.ino));
grub_le_to_cpu64 (dir->data->sb.inodeoffset)
+ grub_le_to_cpu32 (dh.ino_chunk),
grub_cpu_to_le16 (di.ino_offset));
if (err)
return 0;
@ -272,14 +286,14 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
return 0;
err = read_chunk (dir->data->disk, buf,
grub_le_to_cpu16 (di.namelen) + 1,
dir->data->sb.diroffset,
decode_chunk_number (dir->ino.chunk), off);
grub_le_to_cpu64 (dir->data->sb.diroffset)
+ grub_le_to_cpu32 (dir->ino.chunk), off);
if (err)
return 0;
off += grub_le_to_cpu16 (di.namelen) + 1;
buf[grub_le_to_cpu16 (di.namelen) + 1] = 0;
if (grub_le_to_cpu16 (ino.type) == SQUASH_TYPE_DIR)
if (grub_le_to_cpu16 (di.type) == SQUASH_TYPE_DIR)
filetype = GRUB_FSHELP_DIR;
node = grub_malloc (sizeof (*node));
if (! node)
@ -303,9 +317,9 @@ make_root_node (struct grub_squash_data *data, struct grub_fshelp_node *root)
root->data = data;
return read_chunk (data->disk, &root->ino, sizeof (root->ino),
data->sb.inodeoffset,
decode_chunk_number (data->sb.root_ino_chunk),
grub_cpu_to_le16 (data->sb.root_ino_offset));
grub_le_to_cpu64 (data->sb.inodeoffset)
+ grub_le_to_cpu16 (data->sb.root_ino_chunk),
grub_cpu_to_le16 (data->sb.root_ino_offset));
}
static grub_err_t
@ -400,7 +414,7 @@ grub_squash_read (grub_file_t file, char *buf, grub_size_t len)
{
struct grub_squash_frag_desc frag;
err = read_chunk (file->device->disk, &frag, sizeof (frag),
data->fragments, 0, sizeof (frag)
data->fragments, sizeof (frag)
* grub_le_to_cpu16 (data->ino.fragment));
if (err)
return -1;