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pkg2sqfs: implement meta data compression

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Signed-off-by: David Oberhollenzer <goliath@infraroot.at>
This commit is contained in:
David Oberhollenzer 2019-04-17 23:22:12 +02:00
parent f80e4e8d29
commit e123eaf433
5 changed files with 35 additions and 25 deletions
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8
sqfs/meta.c
View file

@ -208,7 +208,7 @@ out_file_blocks:
return 0;
}
int sqfs_write_inodes(sqfs_info_t *info)
int sqfs_write_inodes(sqfs_info_t *info, compressor_stream_t *strm)
{
meta_writer_t *im, *dm;
size_t i, diff;
@ -224,11 +224,11 @@ int sqfs_write_inodes(sqfs_info_t *info)
tmpfd = fileno(tmp);
im = meta_writer_create(info->outfd);
im = meta_writer_create(info->outfd, strm);
if (im == NULL)
goto fail_tmp;
dm = meta_writer_create(tmpfd);
dm = meta_writer_create(tmpfd, strm);
if (dm == NULL)
goto fail_im;
@ -280,8 +280,6 @@ int sqfs_write_inodes(sqfs_info_t *info)
}
}
info->super.flags |= SQFS_FLAG_UNCOMPRESSED_INODES;
meta_writer_destroy(dm);
meta_writer_destroy(im);
fclose(tmp);

20
sqfs/meta_writer.c
View file

@ -1,7 +1,7 @@
/* SPDX-License-Identifier: ISC */
#include "pkg2sqfs.h"
meta_writer_t *meta_writer_create(int fd)
meta_writer_t *meta_writer_create(int fd, compressor_stream_t *strm)
{
meta_writer_t *m = calloc(1, sizeof(*m));
@ -10,6 +10,7 @@ meta_writer_t *meta_writer_create(int fd)
return NULL;
}
m->strm = strm;
m->outfd = fd;
return m;
}
@ -23,13 +24,22 @@ int meta_writer_flush(meta_writer_t *m)
{
ssize_t ret, count;
/* TODO: compress buffer */
if (m->offset == 0)
return 0;
((uint16_t *)m->data)[0] = htole16(m->offset | 0x8000);
count = m->offset + 2;
ret = m->strm->do_block(m->strm, m->data + 2, m->scratch,
m->offset, sizeof(m->scratch));
if (ret < 0)
return -1;
if (ret > 0 && (size_t)ret < m->offset) {
memcpy(m->data + 2, m->scratch, ret);
((uint16_t *)m->data)[0] = htole16(ret);
count = ret + 2;
} else {
((uint16_t *)m->data)[0] = htole16(m->offset | 0x8000);
count = m->offset + 2;
}
ret = write_retry(m->outfd, m->data, count);
if (ret < 0) {

6
sqfs/pkg2sqfs.c
View file

@ -284,13 +284,13 @@ int main(int argc, char **argv)
free(info.block);
info.block = NULL;
if (sqfs_write_inodes(&info))
if (sqfs_write_inodes(&info, cmp))
goto out_fragments;
if (sqfs_write_fragment_table(&info))
if (sqfs_write_fragment_table(&info, cmp))
goto out_fragments;
if (sqfs_write_ids(&info))
if (sqfs_write_ids(&info, cmp))
goto out_fragments;
if (sqfs_super_write(&info))

10
sqfs/pkg2sqfs.h
View file

@ -30,9 +30,11 @@
typedef struct {
uint8_t data[SQFS_META_BLOCK_SIZE + 2];
uint8_t scratch[SQFS_META_BLOCK_SIZE];
size_t offset;
size_t written;
int outfd;
compressor_stream_t *strm;
} meta_writer_t;
typedef struct file_info_t {
@ -121,13 +123,13 @@ void destroy_vfs_tree(vfs_t *fs);
node_t *vfs_node_from_file_id(vfs_t *fs, uint32_t id);
int sqfs_write_inodes(sqfs_info_t *info);
int sqfs_write_inodes(sqfs_info_t *info, compressor_stream_t *strm);
int sqfs_write_ids(sqfs_info_t *info);
int sqfs_write_ids(sqfs_info_t *info, compressor_stream_t *strm);
int sqfs_write_fragment_table(sqfs_info_t *info);
int sqfs_write_fragment_table(sqfs_info_t *info, compressor_stream_t *strm);
meta_writer_t *meta_writer_create(int fd);
meta_writer_t *meta_writer_create(int fd, compressor_stream_t *strm);
void meta_writer_destroy(meta_writer_t *m);

16
sqfs/table.c
View file

@ -2,7 +2,8 @@
#include "pkg2sqfs.h"
static int sqfs_write_table(sqfs_info_t *info, const void *data,
size_t entsize, size_t count, uint64_t *startblock)
size_t entsize, size_t count, uint64_t *startblock,
compressor_stream_t *strm)
{
size_t ent_per_blocks = SQFS_META_BLOCK_SIZE / entsize;
uint64_t blocks[count / ent_per_blocks + 1];
@ -12,7 +13,7 @@ static int sqfs_write_table(sqfs_info_t *info, const void *data,
/* Write actual data. Whenever we cross a block boundary, remember
the block start offset */
m = meta_writer_create(info->outfd);
m = meta_writer_create(info->outfd, strm);
if (m == NULL)
return -1;
@ -57,21 +58,20 @@ fail:
return -1;
}
int sqfs_write_fragment_table(sqfs_info_t *info)
int sqfs_write_fragment_table(sqfs_info_t *info, compressor_stream_t *strm)
{
info->super.fragment_entry_count = info->num_fragments;
return sqfs_write_table(info, info->fragments,
sizeof(info->fragments[0]),
info->num_fragments,
&info->super.fragment_table_start);
&info->super.fragment_table_start, strm);
}
int sqfs_write_ids(sqfs_info_t *info)
int sqfs_write_ids(sqfs_info_t *info, compressor_stream_t *strm)
{
info->super.flags |= SQFS_FLAG_UNCOMPRESSED_IDS;
return sqfs_write_table(info, info->fs.id_tbl,
sizeof(info->fs.id_tbl[0]),
info->fs.num_ids, &info->super.id_table_start);
info->fs.num_ids,
&info->super.id_table_start, strm);
}