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Split grub_squash_read_data

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-12-09 20:48:03 +01:00
parent 8eef1f8244
commit 1fc7203971
1 changed files with 21 additions and 11 deletions
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32
grub-core/fs/squash4.c
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@ -401,17 +401,18 @@ grub_squash_open (struct grub_file *file, const char *name)
}
static grub_ssize_t
grub_squash_read (grub_file_t file, char *buf, grub_size_t len)
grub_squash_read_data (struct grub_squash_data *data,
grub_disk_t disk, const struct grub_squash_inode *ino,
grub_off_t off, char *buf, grub_size_t len)
{
grub_err_t err;
grub_uint64_t a, b;
struct grub_squash_data *data = file->data;
int compressed = 0;
if (grub_le_to_cpu16 (data->ino.fragment) == 0xffff)
if (grub_le_to_cpu16 (ino->fragment) == 0xffff)
{
if (grub_le_to_cpu32 (data->ino.chunk))
a = grub_le_to_cpu32 (data->ino.chunk);
if (grub_le_to_cpu32 (ino->chunk))
a = grub_le_to_cpu32 (ino->chunk);
else
a = sizeof (struct grub_squash_super);
compressed = !(data->sb.flags & SQUASH_FLAG_UNCOMPRESSED_DATA);
@ -419,28 +420,37 @@ grub_squash_read (grub_file_t file, char *buf, grub_size_t len)
else
{
struct grub_squash_frag_desc frag;
err = read_chunk (file->device->disk, &frag, sizeof (frag),
err = read_chunk (disk, &frag, sizeof (frag),
data->fragments, sizeof (frag)
* grub_le_to_cpu16 (data->ino.fragment));
* grub_le_to_cpu16 (ino->fragment));
if (err)
return -1;
a = grub_le_to_cpu64 (frag.offset) + grub_le_to_cpu32 (data->ino.chunk);
a = grub_le_to_cpu64 (frag.offset) + grub_le_to_cpu32 (ino->chunk);
compressed = !(data->sb.flags & SQUASH_FLAG_UNCOMPRESSED_FRAGMENTS);
}
b = grub_le_to_cpu32 (data->ino.offset) + file->offset;
b = grub_le_to_cpu32 (data->ino.offset) + off;
/* FIXME: cache uncompressed chunks. */
if (compressed)
err = grub_zlib_disk_read (file->device->disk, a, b, buf, len);
err = grub_zlib_disk_read (disk, a, b, buf, len);
else
err = grub_disk_read (file->device->disk, (a + b) >> GRUB_DISK_SECTOR_BITS,
err = grub_disk_read (disk, (a + b) >> GRUB_DISK_SECTOR_BITS,
(a + b) & (GRUB_DISK_SECTOR_SIZE - 1), len, buf);
if (err)
return -1;
return len;
}
static grub_ssize_t
grub_squash_read (grub_file_t file, char *buf, grub_size_t len)
{
struct grub_squash_data *data = file->data;
return grub_squash_read_data (data, file->device->disk, &data->ino,
file->offset, buf, len);
}
static grub_err_t
grub_squash_close (grub_file_t file)
{