Split libsquashfs.a into low seperate libraries

The idea is to make libsquashfs.a independend of libfstree.a, so it becomes
a general purpose squashfs manipulation library. All the high level glue code
for libfstree.a and utilites that are overly specific with to tools are moved
to a seperate librarby.

This commit makes the first step by moving the stuff with dependencies on
libfstree to a seperate library.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 0 insertions, 279 deletions

diff --git a/lib/sqfs/write_xattr.c b/lib/sqfs/write_xattr.c
deleted file mode 100644
index 2263fbe..0000000
--- a/lib/sqfs/write_xattr.c
+++ /dev/null
@@ -1,279 +0,0 @@
-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * write_xattr.c
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#include "config.h"
-
-#include "meta_writer.h"
-#include "highlevel.h"
-#include "util.h"
-
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-
-static int write_key(meta_writer_t *mw, const char *key, tree_xattr_t *xattr,
-		     bool value_is_ool)
-{
-	sqfs_xattr_entry_t kent;
-	int type;
-
-	type = sqfs_get_xattr_prefix_id(key);
-	if (type < 0) {
-		fprintf(stderr, "unsupported xattr key '%s'\n", key);
-		return -1;
-	}
-
-	key = strchr(key, '.');
-	assert(key != NULL);
-	++key;
-
-	if (value_is_ool)
-		type |= SQUASHFS_XATTR_FLAG_OOL;
-
-	kent.type = htole16(type);
-	kent.size = htole16(strlen(key));
-
-	if (meta_writer_append(mw, &kent, sizeof(kent)))
-		return -1;
-	if (meta_writer_append(mw, key, strlen(key)))
-		return -1;
-
-	xattr->size += sizeof(sqfs_xattr_entry_t) + strlen(key);
-	return 0;
-}
-
-static int write_value(meta_writer_t *mw, const char *value,
-		       tree_xattr_t *xattr, uint64_t *value_ref_out)
-{
-	sqfs_xattr_value_t vent;
-	uint32_t offset;
-	uint64_t block;
-
-	meta_writer_get_position(mw, &block, &offset);
-	*value_ref_out = (block << 16) | (offset & 0xFFFF);
-
-	vent.size = htole32(strlen(value));
-
-	if (meta_writer_append(mw, &vent, sizeof(vent)))
-		return -1;
-
-	if (meta_writer_append(mw, value, strlen(value)))
-		return -1;
-
-	xattr->size += sizeof(vent) + strlen(value);
-	return 0;
-}
-
-static int write_value_ool(meta_writer_t *mw, uint64_t location,
-			   tree_xattr_t *xattr)
-{
-	sqfs_xattr_value_t vent;
-	uint64_t ref;
-
-	vent.size = htole32(sizeof(location));
-	if (meta_writer_append(mw, &vent, sizeof(vent)))
-		return -1;
-
-	ref = htole64(location);
-	if (meta_writer_append(mw, &ref, sizeof(ref)))
-		return -1;
-
-	xattr->size += sizeof(vent) + sizeof(ref);
-	return 0;
-}
-
-static bool should_store_ool(fstree_t *fs, const char *value, size_t index)
-{
-	size_t refcount;
-
-	refcount = str_table_get_ref_count(&fs->xattr_values, index);
-	if (refcount < 2)
-		return false;
-
-	/*
-	  Storing in line needs this many bytes: refcount * len
-
-	  Storing out-of-line needs this many: len + (refcount - 1) * 8
-
-	  Out-of-line prefereable if:
-	      refcount * len > len + (refcount - 1) * 8
-	   => refcount * len - len > (refcount - 1) * 8
-	   => (refcount - 1) * len > (refcount - 1) * 8
-	   => len > 8
-
-	   Note that this only holds iff refcount - 1 != 0, i.e. refcount > 1,
-	   otherwise we would be dividing by 0 in the 3rd step.
-	 */
-	return strlen(value) > sizeof(uint64_t);
-}
-
-static int write_kv_pairs(fstree_t *fs, meta_writer_t *mw, tree_xattr_t *xattr,
-			  uint64_t *ool_locations)
-{
-	uint32_t key_idx, val_idx;
-	const char *key, *value;
-	uint64_t ref;
-	size_t i;
-
-	for (i = 0; i < xattr->num_attr; ++i) {
-		key_idx = xattr->attr[i].key_index;
-		val_idx = xattr->attr[i].value_index;
-
-		key = str_table_get_string(&fs->xattr_keys, key_idx);
-		value = str_table_get_string(&fs->xattr_values, val_idx);
-
-		if (ool_locations[val_idx] == 0xFFFFFFFFFFFFFFFF) {
-			if (write_key(mw, key, xattr, false))
-				return -1;
-
-			if (write_value(mw, value, xattr, &ref))
-				return -1;
-
-			if (should_store_ool(fs, value, val_idx))
-				ool_locations[val_idx] = ref;
-		} else {
-			if (write_key(mw, key, xattr, true))
-				return -1;
-
-			if (write_value_ool(mw, ool_locations[val_idx], xattr))
-				return -1;
-		}
-	}
-
-	return 0;
-}
-
-static uint64_t *create_ool_locations_table(fstree_t *fs)
-{
-	uint64_t *table;
-	size_t i;
-
-	table = alloc_array(sizeof(uint64_t), fs->xattr_values.num_strings);
-
-	if (table == NULL) {
-		perror("allocating Xattr OOL locations table");
-		return NULL;
-	}
-
-	for (i = 0; i < fs->xattr_values.num_strings; ++i) {
-		table[i] = 0xFFFFFFFFFFFFFFFFUL;
-	}
-
-	return table;
-}
-
-int write_xattr(int outfd, fstree_t *fs, sqfs_super_t *super,
-		compressor_t *cmp)
-{
-	uint64_t kv_start, id_start, block, *tbl, *ool_locations;
-	size_t i = 0, count = 0, blocks;
-	sqfs_xattr_id_table_t idtbl;
-	sqfs_xattr_id_t id_ent;
-	meta_writer_t *mw;
-	tree_xattr_t *it;
-	uint32_t offset;
-
-	if (fs->xattr == NULL)
-		return 0;
-
-	ool_locations = create_ool_locations_table(fs);
-	if (ool_locations == NULL)
-		return -1;
-
-	mw = meta_writer_create(outfd, cmp, false);
-	if (mw == NULL)
-		goto fail_ool;
-
-	/* write xattr key-value pairs */
-	kv_start = super->bytes_used;
-
-	for (it = fs->xattr; it != NULL; it = it->next) {
-		meta_writer_get_position(mw, &it->block, &it->offset);
-		it->size = 0;
-
-		if (write_kv_pairs(fs, mw, it, ool_locations))
-			goto fail_mw;
-
-		++count;
-	}
-
-	if (meta_writer_flush(mw))
-		goto fail_mw;
-
-	meta_writer_get_position(mw, &block, &offset);
-	meta_writer_reset(mw);
-
-	super->bytes_used += block;
-
-	/* allocate location table */
-	blocks = (count * sizeof(id_ent)) / SQFS_META_BLOCK_SIZE;
-
-	if ((count * sizeof(id_ent)) % SQFS_META_BLOCK_SIZE)
-		++blocks;
-
-	tbl = alloc_array(sizeof(uint64_t), blocks);
-
-	if (tbl == NULL) {
-		perror("generating xattr ID table");
-		goto fail_mw;
-	}
-
-	/* write ID table referring to key value pairs, record offsets */
-	id_start = 0;
-	tbl[i++] = htole64(super->bytes_used);
-
-	for (it = fs->xattr; it != NULL; it = it->next) {
-		id_ent.xattr = htole64((it->block << 16) | it->offset);
-		id_ent.count = htole32(it->num_attr);
-		id_ent.size = htole32(it->size);
-
-		if (meta_writer_append(mw, &id_ent, sizeof(id_ent)))
-			goto fail_tbl;
-
-		meta_writer_get_position(mw, &block, &offset);
-
-		if (block != id_start) {
-			id_start = block;
-			tbl[i++] = htole64(super->bytes_used + id_start);
-		}
-	}
-
-	if (meta_writer_flush(mw))
-		goto fail_tbl;
-
-	meta_writer_get_position(mw, &block, &offset);
-	super->bytes_used += block;
-
-	/* write offset table */
-	idtbl.xattr_table_start = htole64(kv_start);
-	idtbl.xattr_ids = htole32(count);
-	idtbl.unused = 0;
-
-	if (write_data("writing xattr ID table", outfd, &idtbl, sizeof(idtbl)))
-		goto fail_tbl;
-
-	if (write_data("writing xattr ID table",
-		       outfd, tbl, sizeof(tbl[0]) * blocks)) {
-		goto fail_tbl;
-	}
-
-	super->xattr_id_table_start = super->bytes_used;
-	super->bytes_used += sizeof(idtbl) + sizeof(tbl[0]) * blocks;
-	super->flags &= ~SQFS_FLAG_NO_XATTRS;
-
-	free(tbl);
-	meta_writer_destroy(mw);
-	free(ool_locations);
-	return 0;
-fail_tbl:
-	free(tbl);
-fail_mw:
-	meta_writer_destroy(mw);
-fail_ool:
-	free(ool_locations);
-	return -1;
-}