mirror of https://github.com/pygos/pkg-utils.git
93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
/* SPDX-License-Identifier: ISC */
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#include "sqfs/squashfs.h"
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#include "util/util.h"
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#include <endian.h>
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#include <stdio.h>
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static int sqfs_write_table(int outfd, sqfs_super_t *super, const void *data,
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size_t entsize, size_t count, uint64_t *startblock,
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compressor_stream_t *strm)
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{
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size_t ent_per_blocks = SQFS_META_BLOCK_SIZE / entsize;
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uint64_t blocks[count / ent_per_blocks + 1];
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size_t i, blkidx = 0, tblsize;
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meta_writer_t *m;
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ssize_t ret;
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/* Write actual data. Whenever we cross a block boundary, remember
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the block start offset */
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m = meta_writer_create(outfd, strm);
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if (m == NULL)
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return -1;
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for (i = 0; i < count; ++i) {
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if (blkidx == 0 || m->written > blocks[blkidx - 1])
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blocks[blkidx++] = m->written;
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if (meta_writer_append(m, data, entsize))
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goto fail;
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data = (const char *)data + entsize;
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}
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if (meta_writer_flush(m))
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goto fail;
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for (i = 0; i < blkidx; ++i)
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blocks[i] = htole64(blocks[i] + super->bytes_used);
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super->bytes_used += m->written;
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meta_writer_destroy(m);
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/* write new index table */
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*startblock = super->bytes_used;
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tblsize = sizeof(blocks[0]) * blkidx;
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ret = write_retry(outfd, blocks, tblsize);
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if (ret < 0) {
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perror("writing index table");
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return -1;
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}
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if ((size_t)ret < tblsize) {
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fputs("index table truncated\n", stderr);
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return -1;
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}
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super->bytes_used += tblsize;
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return 0;
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fail:
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meta_writer_destroy(m);
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return -1;
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}
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int sqfs_write_fragment_table(int outfd, sqfs_super_t *super,
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sqfs_fragment_t *fragments, size_t count,
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compressor_stream_t *strm)
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{
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super->fragment_entry_count = count;
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return sqfs_write_table(outfd, super, fragments, sizeof(fragments[0]),
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count, &super->fragment_table_start, strm);
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}
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int sqfs_write_ids(int outfd, sqfs_super_t *super,
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uint32_t *id_tbl, size_t count,
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compressor_stream_t *strm)
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{
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size_t i;
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int ret;
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for (i = 0; i < count; ++i)
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id_tbl[i] = htole32(id_tbl[i]);
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ret = sqfs_write_table(outfd, super, id_tbl, sizeof(id_tbl[0]),
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count, &super->id_table_start, strm);
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for (i = 0; i < count; ++i)
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id_tbl[i] = htole32(id_tbl[i]);
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return ret;
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}
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