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Make type-dependent portion of inode an union

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-12-09 21:14:42 +01:00
parent 1fc7203971
commit 627a62fc70
1 changed files with 31 additions and 18 deletions
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49
grub-core/fs/squash4.c
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@ -75,13 +75,26 @@ struct grub_squash_inode
{
/* Same values as direlem types. */
grub_uint16_t type;
grub_uint16_t dummy1[3];
grub_uint16_t dummy[3];
grub_uint32_t mtime;
grub_uint16_t dummy2[2];
grub_uint32_t chunk;
grub_uint32_t fragment;
grub_uint32_t offset;
grub_uint32_t size;
union
{
struct {
grub_uint16_t dummy[2];
grub_uint32_t chunk;
grub_uint32_t fragment;
grub_uint32_t offset;
grub_uint32_t size;
} file;
struct {
grub_uint16_t dummy1[2];
grub_uint32_t chunk;
grub_uint16_t dummy2[2];
grub_uint16_t size;
grub_uint16_t offset;
grub_uint16_t dummy3[2];
} dir;
};
} __attribute__ ((packed));
/* Chunk-based. */
@ -245,12 +258,12 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node))
{
grub_uint32_t off = grub_le_to_cpu32 (dir->ino.offset) >> 16;
grub_uint32_t off = grub_le_to_cpu16 (dir->ino.dir.offset);
grub_uint32_t endoff;
unsigned i;
/* FIXME: why - 3 ? */
endoff = (grub_le_to_cpu32 (dir->ino.offset) & 0xffff) + off - 3;
endoff = grub_le_to_cpu32 (dir->ino.dir.size) + off - 3;
while (off < endoff)
{
@ -259,7 +272,7 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
err = read_chunk (dir->data->disk, &dh, sizeof (dh),
grub_le_to_cpu64 (dir->data->sb.diroffset)
+ grub_le_to_cpu32 (dir->ino.chunk), off);
+ grub_le_to_cpu32 (dir->ino.dir.chunk), off);
if (err)
return 0;
off += sizeof (dh);
@ -274,7 +287,7 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
err = read_chunk (dir->data->disk, &di, sizeof (di),
grub_le_to_cpu64 (dir->data->sb.diroffset)
+ grub_le_to_cpu32 (dir->ino.chunk), off);
+ grub_le_to_cpu32 (dir->ino.dir.chunk), off);
if (err)
return 0;
off += sizeof (di);
@ -292,7 +305,7 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
err = read_chunk (dir->data->disk, buf,
grub_le_to_cpu16 (di.namelen) + 1,
grub_le_to_cpu64 (dir->data->sb.diroffset)
+ grub_le_to_cpu32 (dir->ino.chunk), off);
+ grub_le_to_cpu32 (dir->ino.dir.chunk), off);
if (err)
return 0;
@ -395,7 +408,7 @@ grub_squash_open (struct grub_file *file, const char *name)
file->data = data;
data->ino = fdiro->ino;
file->size = grub_le_to_cpu32 (fdiro->ino.size);
file->size = grub_le_to_cpu32 (fdiro->ino.file.size);
return GRUB_ERR_NONE;
}
@ -409,10 +422,10 @@ grub_squash_read_data (struct grub_squash_data *data,
grub_uint64_t a, b;
int compressed = 0;
if (grub_le_to_cpu16 (ino->fragment) == 0xffff)
if (grub_le_to_cpu16 (ino->file.fragment) == 0xffff)
{
if (grub_le_to_cpu32 (ino->chunk))
a = grub_le_to_cpu32 (ino->chunk);
if (grub_le_to_cpu32 (ino->file.chunk))
a = grub_le_to_cpu32 (ino->file.chunk);
else
a = sizeof (struct grub_squash_super);
compressed = !(data->sb.flags & SQUASH_FLAG_UNCOMPRESSED_DATA);
@ -422,14 +435,14 @@ grub_squash_read_data (struct grub_squash_data *data,
struct grub_squash_frag_desc frag;
err = read_chunk (disk, &frag, sizeof (frag),
data->fragments, sizeof (frag)
* grub_le_to_cpu16 (ino->fragment));
* grub_le_to_cpu16 (ino->file.fragment));
if (err)
return -1;
a = grub_le_to_cpu64 (frag.offset) + grub_le_to_cpu32 (ino->chunk);
a = grub_le_to_cpu64 (frag.offset) + grub_le_to_cpu32 (ino->file.chunk);
compressed = !(data->sb.flags & SQUASH_FLAG_UNCOMPRESSED_FRAGMENTS);
}
b = grub_le_to_cpu32 (data->ino.offset) + off;
b = grub_le_to_cpu32 (data->ino.file.offset) + off;
/* FIXME: cache uncompressed chunks. */
if (compressed)