/*

  * Copyright (C) 2008  Kristian Høgsberg <krh@redhat.com>

  * Copyright (C) 2008  Red Hat, Inc

  *

  * This program is free software; you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation; either version 2 of the License, or

  * (at your option) any later version.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License along

  * with this program; if not, write to the Free Software Foundation, Inc.,

  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

  */

 #define _GNU_SOURCE

 #include <stdlib.h>

 #include <stddef.h>

 #include <stdint.h>

 #include <stdio.h>

 #include <string.h>

 #include <sys/types.h>

 #include <sys/stat.h>

 #include <sys/mman.h>

 #include <unistd.h>

 #include <fcntl.h>

 #include <errno.h>

 #include <ctype.h>

 #include <fnmatch.h>

 #include "razor.h"

 #include "razor-internal.h"

 #include "types.h"

 struct razor_set_section {

 	uint32_t type;

 	uint32_t offset;

 	uint32_t size;

 };

 struct razor_set_header {

 	uint32_t magic;

 	uint32_t version;

 	struct razor_set_section sections[0];

 };

 #define RAZOR_MAGIC 0x7a7a7a7a

 #define RAZOR_VERSION 1

 #define RAZOR_STRING_POOL	0

 #define RAZOR_PACKAGES		1

 #define RAZOR_PROPERTIES	2

 #define RAZOR_FILES		3

 #define RAZOR_PACKAGE_POOL	4

 #define RAZOR_PROPERTY_POOL	5

 #define RAZOR_FILE_POOL		6

 struct razor_package {

 	uint name  : 24;

 	uint flags : 8;

 	uint32_t version;

 	uint32_t arch;

 	struct list_head properties;

 	struct list_head files;

 };

 struct razor_property {

 	uint name  : 24;

 	uint flags : 6;

 	enum razor_property_type type : 2;

 	enum razor_version_relation relation : 32;

 	uint32_t version;

 	struct list_head packages;

 };

 struct razor_entry {

 	uint name  : 24;

 	uint flags : 8;

 	uint32_t start;

 	struct list_head packages;

 };

 #define RAZOR_ENTRY_LAST	0x80

 struct razor_set {

 	struct array string_pool;

  	struct array packages;

  	struct array properties;

  	struct array files;

 	struct array package_pool;

  	struct array property_pool;

  	struct array file_pool;

 	struct razor_set_header *header;

 };

 struct import_entry {

 	uint32_t package;

 	char *name;

 };

 struct import_directory {

 	uint32_t name, count;

 	struct array files;

 	struct array packages;

 	struct import_directory *last;

 };

 struct razor_importer {

 	struct razor_set *set;

 	struct hashtable table;

 	struct razor_package *package;

 	struct array properties;

 	struct array files;

 	struct array file_requires;

 };

 static void *

 zalloc(size_t size)

 {

 	void *p;

 	p = malloc(size);

 	memset(p, 0, size);

 	return p;

 }

 struct razor_set_section razor_sections[] = {

 	{ RAZOR_STRING_POOL,	offsetof(struct razor_set, string_pool) },

 	{ RAZOR_PACKAGES,	offsetof(struct razor_set, packages) },

 	{ RAZOR_PROPERTIES,	offsetof(struct razor_set, properties) },

 	{ RAZOR_FILES,		offsetof(struct razor_set, files) },

 	{ RAZOR_PACKAGE_POOL,	offsetof(struct razor_set, package_pool) },

 	{ RAZOR_PROPERTY_POOL,	offsetof(struct razor_set, property_pool) },

 	{ RAZOR_FILE_POOL,	offsetof(struct razor_set, file_pool) },

 };

 struct razor_set *

 razor_set_create(void)

 {

 	struct razor_set *set;

 	struct razor_entry *e;

 	char *empty;

 	set = zalloc(sizeof *set);

 	e = array_add(&set->files, sizeof *e);

 	empty = array_add(&set->string_pool, 1);

 	*empty = '\0';

 	e->name = 0;

 	e->flags = RAZOR_ENTRY_LAST;

 	e->start = 0;

 	list_set_empty(&e->packages);

 	return set;

 }

 struct razor_set *

 razor_set_open(const char *filename)

 {

 	struct razor_set *set;

 	struct razor_set_section *s;

 	struct stat stat;

 	struct array *array;

 	int fd;

 	set = zalloc(sizeof *set);

 	fd = open(filename, O_RDONLY);

 	if (fstat(fd, &stat) < 0)

 		return NULL;

 	set->header = mmap(NULL, stat.st_size, PROT_READ, MAP_PRIVATE, fd, 0);

 	if (set->header == MAP_FAILED) {

 		free(set);

 		return NULL;

 	}

 	for (s = set->header->sections; ~s->type; s++) {

 		if (s->type >= ARRAY_SIZE(razor_sections))

 			continue;

 		if (s->type != razor_sections[s->type].type)

 			continue;

 		array = (void *) set + razor_sections[s->type].offset;

 		array->data = (void *) set->header + s->offset;

 		array->size = s->size;

 		array->alloc = s->size;

 	}

 	close(fd);

 	return set;

 }

 void

 razor_set_destroy(struct razor_set *set)

 {

 	unsigned int size;

 	struct array *a;

 	int i;

 	if (set->header) {

 		for (i = 0; set->header->sections[i].type; i++)

 			;

 		size = set->header->sections[i].type;

 		munmap(set->header, size);

 	} else {

 		for (i = 0; i < ARRAY_SIZE(razor_sections); i++) {

 			a = (void *) set + razor_sections[i].offset;

 			free(a->data);

 		}

 	}

 	free(set);

 }

 int

 razor_set_write_to_fd(struct razor_set *set, int fd)

 {

 	char data[4096];

 	struct razor_set_header *header = (struct razor_set_header *) data;

 	struct array *a;

 	uint32_t offset;

 	int i;

 	memset(data, 0, sizeof data);

 	header->magic = RAZOR_MAGIC;

 	header->version = RAZOR_VERSION;

 	offset = sizeof data;

 	for (i = 0; i < ARRAY_SIZE(razor_sections); i++) {

 		if (razor_sections[i].type != i)

 			continue;

 		a = (void *) set + razor_sections[i].offset;

 		header->sections[i].type = i;

 		header->sections[i].offset = offset;

 		header->sections[i].size = a->size;

 		offset += ALIGN(a->size, 4096);

 	}

 	header->sections[i].type = ~0;

 	header->sections[i].offset = 0;

 	header->sections[i].size = 0;

 	razor_write(fd, data, sizeof data);

 	memset(data, 0, sizeof data);

 	for (i = 0; i < ARRAY_SIZE(razor_sections); i++) {

 		if (razor_sections[i].type != i)

 			continue;

 		a = (void *) set + razor_sections[i].offset;

 		razor_write(fd, a->data, a->size);

 		razor_write(fd, data, ALIGN(a->size, 4096) - a->size);

 	}

 	return 0;

 }

 int

 razor_set_write(struct razor_set *set, const char *filename)

 {

 	int fd, status;

 	fd = open(filename, O_CREAT | O_WRONLY | O_TRUNC, 0666);

 	if (fd < 0)

 		return -1;

 	status = razor_set_write_to_fd(set, fd);

 	if (status) {

 	    close(fd);

 	    return status;

 	}

 	return close(fd);

 }

 void

 razor_build_evr(char *evr_buf, int size, const char *epoch,

 		const char *version, const char *release)

 {

 	int len;

 	if (!version || !*version) {

 		*evr_buf = '\0';

 		return;

 	}

 	if (epoch && *epoch && strcmp(epoch, "0") != 0) {

 		len = snprintf(evr_buf, size, "%s:", epoch);

 		evr_buf += len;

 		size -= len;

 	}

 	len = snprintf(evr_buf, size, "%s", version);

 	evr_buf += len;

 	size -= len;

 	if (release && *release)

 		snprintf(evr_buf, size, "-%s", release);

 }

 void

 razor_importer_begin_package(struct razor_importer *importer,

 			     const char *name,

 			     const char *version,

 			     const char *arch)

 {

 	struct razor_package *p;

 	p = array_add(&importer->set->packages, sizeof *p);

 	p->name = hashtable_tokenize(&importer->table, name);

 	p->flags = 0;

 	p->version = hashtable_tokenize(&importer->table, version);

 	p->arch = hashtable_tokenize(&importer->table, arch);

 	importer->package = p;

 	array_init(&importer->properties);

 }

 void

 razor_importer_finish_package(struct razor_importer *importer)

 {

 	list_set_array(&importer->package->properties,

 		       &importer->set->property_pool,

 		       &importer->properties,

 		       1);

 	array_release(&importer->properties);

 }

 void

 razor_importer_add_property(struct razor_importer *importer,

 			    const char *name,

 			    enum razor_version_relation relation,

 			    const char *version,

 			    enum razor_property_type type)

 {

 	struct razor_property *p;

 	uint32_t *r;

 	p = array_add(&importer->set->properties, sizeof *p);

 	p->name = hashtable_tokenize(&importer->table, name);

 	p->flags = 0;

 	p->type = type;

 	p->relation = relation;

 	p->version = hashtable_tokenize(&importer->table, version);

 	list_set_ptr(&p->packages, importer->package -

 		     (struct razor_package *) importer->set->packages.data);

 	r = array_add(&importer->properties, sizeof *r);

 	*r = p - (struct razor_property *) importer->set->properties.data;

 	if (type == RAZOR_PROPERTY_REQUIRES && *name == '/') {

 		r = array_add(&importer->file_requires, sizeof *r);

 		*r = p->name;

 	}

 }

 void

 razor_importer_add_file(struct razor_importer *importer, const char *name)

 {

 	struct import_entry *e;

 	e = array_add(&importer->files, sizeof *e);

 	e->package = importer->package -

 		(struct razor_package *) importer->set->packages.data;

 	e->name = strdup(name);

 }

 struct razor_importer *

 razor_importer_new(void)

 {

 	struct razor_importer *importer;

 	importer = zalloc(sizeof *importer);

 	importer->set = razor_set_create();

 	hashtable_init(&importer->table, &importer->set->string_pool);

 	return importer;

 }

 /* Destroy an importer without creating the set. */

 void

 razor_importer_destroy(struct razor_importer *importer)

 {

 	/* FIXME: write this */

 }

 static int

 versioncmp(const char *s1, const char *s2)

 {

 	const char *p1, *p2;

 	long n1, n2;

 	int res;

 	n1 = strtol(s1, (char **) &p1, 10);

 	n2 = strtol(s2, (char **) &p2, 10);

 	/* Epoch; if one but not the other has an epoch set, default

 	 * the epoch-less version to 0. */

 	res = (*p1 == ':') - (*p2 == ':');

 	if (res < 0) {

 		n1 = 0;

 		p1 = s1;

 		p2++;

 	} else if (res > 0) {

 		p1++;

 		n2 = 0;

 		p2 = s2;

 	}

 	if (n1 != n2)

 		return n1 - n2;

 	while (*p1 && *p2) {

 		if (*p1 != *p2)

 			return *p1 - *p2;

 		p1++;

 		p2++;

 		if (isdigit(*p1) && isdigit(*p2))

 			return versioncmp(p1, p2);

 	}

 	return *p1 - *p2;

 }

 static int

 compare_packages(const void *p1, const void *p2, void *data)

 {

 	const struct razor_package *pkg1 = p1, *pkg2 = p2;

 	struct razor_set *set = data;

 	char *pool = set->string_pool.data;

 	/* FIXME: what if the flags are different? */

 	if (pkg1->name == pkg2->name)

 		return versioncmp(&pool[pkg1->version], &pool[pkg2->version]);

 	else

 		return strcmp(&pool[pkg1->name], &pool[pkg2->name]);

 }

 static int

 compare_properties(const void *p1, const void *p2, void *data)

 {

 	const struct razor_property *prop1 = p1, *prop2 = p2;

 	struct razor_set *set = data;

 	char *pool = set->string_pool.data;

 	if (prop1->name != prop2->name) 

 		return strcmp(&pool[prop1->name], &pool[prop2->name]);

 	else if (prop1->type != prop2->type)

 		return prop1->type - prop2->type;

 	else if (prop1->relation != prop2->relation)

 		return prop1->relation - prop2->relation;

 	else

 		return versioncmp(&pool[prop1->version], &pool[prop2->version]);

 }

 static uint32_t *

 uniqueify_properties(struct razor_set *set)

 {

 	struct razor_property *rp, *up, *rp_end;

 	struct array *pkgs, *p;

 	struct list_head *r;

 	uint32_t *map, *rmap;

 	int i, count, unique;

 	count = set->properties.size / sizeof(struct razor_property);

 	map = razor_qsort_with_data(set->properties.data,

 				    count,

 				    sizeof(struct razor_property),

 				    compare_properties,

 				    set);

 	rp_end = set->properties.data + set->properties.size;

 	rmap = malloc(count * sizeof *map);

 	pkgs = zalloc(count * sizeof *pkgs);

 	for (rp = set->properties.data, up = rp, i = 0; rp < rp_end; rp++, i++) {

 		if (rp->name != up->name || rp->type != up->type ||

 		    rp->relation != up->relation || rp->version != up->version) {

 			up++;

 			up->name = rp->name;

 			up->flags = 0;

 			up->type = rp->type;

 			up->relation = rp->relation;

 			up->version = rp->version;

 		}

 		unique = up - (struct razor_property *) set->properties.data;

 		rmap[map[i]] = unique;

 		r = array_add(&pkgs[unique], sizeof *r);

 		*r = rp->packages;

 	}

 	free(map);

 	if (up != rp)

 		up++;

 	set->properties.size = (void *) up - set->properties.data;

 	rp_end = up;

 	for (rp = set->properties.data, p = pkgs; rp < rp_end; rp++, p++) {

 		list_set_array(&rp->packages, &set->package_pool, p, 0);

 		array_release(p);

 	}

 	free(pkgs);

 	return rmap;

 }

 static int

 compare_filenames(const void *p1, const void *p2, void *data)

 {

 	const struct import_entry *e1 = p1;

 	const struct import_entry *e2 = p2;

 	const char *n1 = e1->name;

 	const char *n2 = e2->name;

 	/* Need to make sure that the contents of a directory

 	 * are sorted immediately after it. So "foo/bar" has to

 	 * sort before "foo.conf"

 	 *

 	 * FIXME: this is about 60% slower than strcmp

 	 */

 	while (*n1 && *n2) {

 		if (*n1 < *n2)

 			return *n2 == '/' ? 1 : -1;

 		else if (*n1 > *n2)

 			return *n1 == '/' ? -1 : 1;

 		n1++;

 		n2++;

 	}

 	if (*n1)

 		return 1;

 	else if (*n2)

 		return -1;

 	else

 		return 0;

 }

 static void

 count_entries(struct import_directory *d)

 {

 	struct import_directory *p, *end;

 	p = d->files.data;

 	end = d->files.data + d->files.size;

 	d->count = 0;

 	while (p < end) {

 		count_entries(p);

 		d->count += p->count + 1;

 		p++;

 	}		

 }

 static void

 serialize_files(struct razor_set *set,

 		struct import_directory *d, struct array *array)

 {

 	struct import_directory *p, *end;

 	struct razor_entry *e = NULL;

 	uint32_t s;

 	p = d->files.data;

 	end = d->files.data + d->files.size;

 	s = array->size / sizeof *e + d->files.size / sizeof *p;

 	while (p < end) {

 		e = array_add(array, sizeof *e);

 		e->name = p->name;

 		e->flags = 0;

 		e->start = p->count > 0 ? s : 0;

 		s += p->count;

 		list_set_array(&e->packages, &set->package_pool, &p->packages, 0);

 		array_release(&p->packages);

 		p++;

 	}		

 	if (e != NULL)

 		e->flags |= RAZOR_ENTRY_LAST;

 	p = d->files.data;

 	end = d->files.data + d->files.size;

 	while (p < end) {

 		serialize_files(set, p, array);

 		p++;

 	}

 }

 static void

 remap_property_package_links(struct array *properties, uint32_t *rmap)

 {

 	struct razor_property *p, *end;

 	end = properties->data + properties->size;

 	for (p = properties->data; p < end; p++)

 		list_remap_head(&p->packages, rmap);

 }

 static void

 build_file_tree(struct razor_importer *importer)

 {

 	int count, i, length;

 	struct import_entry *filenames;

 	char *f, *end;

 	uint32_t name, *r;

 	char dirname[256];

 	struct import_directory *d, root;

 	struct razor_entry *e;

 	count = importer->files.size / sizeof (struct import_entry);

 	razor_qsort_with_data(importer->files.data,

 			      count,

 			      sizeof (struct import_entry),

 			      compare_filenames,

 			      NULL);

 	root.name = hashtable_tokenize(&importer->table, "");

 	array_init(&root.files);

 	array_init(&root.packages);

 	root.last = NULL;

 	filenames = importer->files.data;

 	for (i = 0; i < count; i++) {

 		f = filenames[i].name;

 		if (*f != '/')

 			continue;

 		f++;

 		d = &root;

 		while (*f) {

 			end = strchr(f, '/');

 			if (end == NULL)

 				end = f + strlen(f);

 			length = end - f;

 			memcpy(dirname, f, length);

 			dirname[length] ='\0';

 			name = hashtable_tokenize(&importer->table, dirname);

 			if (d->last == NULL || d->last->name != name) {

 				d->last = array_add(&d->files, sizeof *d);

 				d->last->name = name;

 				d->last->last = NULL;

 				array_init(&d->last->files);

 				array_init(&d->last->packages);

 			}

 			d = d->last;				

 			f = end + 1;

 			if (*end == '\0')

 				break;

 		}

 		r = array_add(&d->packages, sizeof *r);

 		*r = filenames[i].package;

 		free(filenames[i].name);

 	}

 	count_entries(&root);

 	e = importer->set->files.data;

 	e->name = root.name;

 	e->flags = RAZOR_ENTRY_LAST;

 	e->start = importer->files.size ? 1 : 0;

 	list_set_empty(&e->packages);

 	serialize_files(importer->set, &root, &importer->set->files);

 	array_release(&importer->files);

 }

 static struct razor_entry *

 find_entry(struct razor_set *set, struct razor_entry *dir, const char *pattern);

 static void

 list_to_array(struct list *list, struct array *array)

 {

 	uint32_t *item;

 	while (list) {

 		 item = array_add(array, sizeof *item);

 		 *item = list->data;

 		 list = list_next(list);

 	}

 }

 static int

 compare_file_requires(const void *p1, const void *p2, void *data)

 {

 	uint32_t *f1 = (void *)p1, *f2 = (void *)p2;

 	const char *pool = data;

 	return strcmp(&pool[*f1], &pool[*f2]);

 }

 static void

 find_file_provides(struct razor_importer *importer)

 {

 	struct razor_property *prop;

 	struct razor_entry *top, *entry;

 	struct razor_package *packages;

 	struct array pkgprops;

 	struct list *pkg;

 	uint32_t *req, *req_start, *req_end;

 	uint32_t *map, *newprop;

 	char *pool;

 	pool = importer->set->string_pool.data;

 	packages = importer->set->packages.data;

 	top = importer->set->files.data;

 	req = req_start = importer->file_requires.data;

 	req_end = importer->file_requires.data + importer->file_requires.size;

 	map = razor_qsort_with_data(req, req_end - req, sizeof *req,

 				    compare_file_requires, pool);

 	free(map);

 	for (req = req_start; req < req_end; req++) {

 		if (req > req_start && req[0] == req[-1])

 			continue;

 		entry = find_entry(importer->set, top, &pool[*req]);

 		if (!entry)

 			continue;

 		for (pkg = list_first(&entry->packages, &importer->set->package_pool); pkg; pkg = list_next(pkg)) {

 			prop = array_add(&importer->set->properties, sizeof *prop);

 			prop->name = *req;

 			prop->type = RAZOR_PROPERTY_PROVIDES;

 			prop->relation = RAZOR_VERSION_EQUAL;

 			prop->version = hashtable_tokenize(&importer->table, "");

 			list_set_ptr(&prop->packages, pkg->data);

 			/* Update property list of pkg */

 			array_init(&pkgprops);

 			list_to_array(list_first(&packages[pkg->data].properties, &importer->set->property_pool), &pkgprops);

 			newprop = array_add(&pkgprops, sizeof *newprop);

 			*newprop = prop - (struct razor_property *)importer->set->properties.data;

 			list_set_array(&packages[pkg->data].properties, &importer->set->property_pool, &pkgprops, 1);

 			array_release(&pkgprops);

 		}

 	}

 	array_release(&importer->file_requires);

 }

 static void

 build_package_file_lists(struct razor_set *set, uint32_t *rmap)

 {

 	struct razor_package *p, *packages;

 	struct array *pkgs;

 	struct razor_entry *e, *end;

 	struct list *r;

 	uint32_t *q;

 	int i, count;

 	count = set->packages.size / sizeof *p;

 	pkgs = zalloc(count * sizeof *pkgs);

 	end = set->files.data + set->files.size;

 	for (e = set->files.data; e < end; e++) {

 		list_remap_head(&e->packages, rmap);

 		r = list_first(&e->packages, &set->package_pool);

 		while (r) {

 			q = array_add(&pkgs[r->data], sizeof *q);

 			*q = e - (struct razor_entry *) set->files.data;

 			r = list_next(r);

 		}

 	}

 	packages = set->packages.data;

 	for (i = 0; i < count; i++) {

 		list_set_array(&packages[i].files, &set->file_pool, &pkgs[i], 0);

 		array_release(&pkgs[i]);

 	}

 	free(pkgs);

 }

 struct razor_set *

 razor_importer_finish(struct razor_importer *importer)

 {

 	struct razor_set *set;

 	uint32_t *map, *rmap;

 	int i, count;

 	build_file_tree(importer);

 	find_file_provides(importer);

 	map = uniqueify_properties(importer->set);

 	list_remap_pool(&importer->set->property_pool, map);

 	free(map);

 	count = importer->set->packages.size / sizeof(struct razor_package);

 	map = razor_qsort_with_data(importer->set->packages.data,

 				    count,

 				    sizeof(struct razor_package),

 				    compare_packages,

 				    importer->set);

 	rmap = malloc(count * sizeof *rmap);

 	for (i = 0; i < count; i++)

 		rmap[map[i]] = i;

 	free(map);

 	list_remap_pool(&importer->set->package_pool, rmap);

 	build_package_file_lists(importer->set, rmap);

 	remap_property_package_links(&importer->set->properties, rmap);

 	free(rmap);

 	set = importer->set;

 	hashtable_release(&importer->table);

 	free(importer);

 	return set;

 }

 struct razor_package_iterator {

 	struct razor_set *set;

 	struct razor_package *package, *end;

 	struct list *index;

 	int free_index;

 };

 static struct razor_package_iterator *

 razor_package_iterator_create_with_index(struct razor_set *set,

 					 struct list *index)

 {

 	struct razor_package_iterator *pi;

 	pi = zalloc(sizeof *pi);

 	pi->set = set;

 	pi->index = index;

 	return pi;

 }

 struct razor_package_iterator *

 razor_package_iterator_create(struct razor_set *set)

 {

 	struct razor_package_iterator *pi;

 	pi = zalloc(sizeof *pi);

 	pi->set = set;

 	pi->end = set->packages.data + set->packages.size;

 	pi->package = set->packages.data;

 	return pi;

 }

 static void

 razor_package_iterator_init_for_property(struct razor_package_iterator *pi,

 					 struct razor_set *set,

 					 struct razor_property *property)

 {

 	memset(pi, 0, sizeof *pi);

 	pi->set = set;

 	pi->index = list_first(&property->packages, &set->package_pool);

 }

 struct razor_package_iterator *

 razor_package_iterator_create_for_property(struct razor_set *set,

 					   struct razor_property *property)

 {

 	struct list *index;

 	index = list_first(&property->packages, &set->package_pool);

 	return razor_package_iterator_create_with_index(set, index);

 }

 int

 razor_package_iterator_next(struct razor_package_iterator *pi,

 			    struct razor_package **package,

 			    const char **name,

 			    const char **version,

 			    const char **arch)

 {

 	char *pool;

 	int valid;

 	struct razor_package *p, *packages;

 	if (pi->package) {

 		p = pi->package++;

 		valid = p < pi->end;

 	} else if (pi->index) {

 		packages = pi->set->packages.data;

 		p = &packages[pi->index->data];

 		pi->index = list_next(pi->index);

 		valid = 1;

 	} else

 		valid = 0;

 	if (valid) {

 		pool = pi->set->string_pool.data;

 		*package = p;

 		*name = &pool[p->name];

 		*version = &pool[p->version];

 		*arch = &pool[p->arch];

 	} else {

 		*package = NULL;

 	}

 	return valid;

 }

 void

 razor_package_iterator_destroy(struct razor_package_iterator *pi)

 {

 	if (pi->free_index)

 		free(pi->index);

 	free(pi);

 }

 struct razor_package *

 razor_set_get_package(struct razor_set *set, const char *package)

 {

 	struct razor_package_iterator *pi;

 	struct razor_package *p;

 	const char *name, *version, *arch;

 	pi = razor_package_iterator_create(set);

 	while (razor_package_iterator_next(pi, &p, &name, &version, &arch)) {

 		if (strcmp(package, name) == 0)

 			break;

 	}

 	razor_package_iterator_destroy(pi);

 	return p;

 }

 struct razor_property_iterator {

 	struct razor_set *set;

 	struct razor_property *property, *end;

 	struct list *index;

 };

 struct razor_property_iterator *

 razor_property_iterator_create(struct razor_set *set,

 			       struct razor_package *package)

 {

 	struct razor_property_iterator *pi;

 	pi = zalloc(sizeof *pi);

 	pi->set = set;

 	if (package) {

 		pi->index = list_first(&package->properties,

 				       &set->property_pool);

 	} else {

 		pi->property = set->properties.data;

 		pi->end = set->properties.data + set->properties.size;

 	}

 	return pi;

 }

 int

 razor_property_iterator_next(struct razor_property_iterator *pi,

 			     struct razor_property **property,

 			     const char **name,

 			     enum razor_version_relation *relation,

 			     const char **version,

 			     enum razor_property_type *type)

 {

 	char *pool;

 	int valid;

 	struct razor_property *p, *properties;

 	if (pi->property) {

 		p = pi->property++;

 		valid = p < pi->end;

 	} else if (pi->index) {

 		properties = pi->set->properties.data;

 		p = &properties[pi->index->data];

 		pi->index = list_next(pi->index);

 		valid = 1;

 	} else

 		valid = 0;

 	if (valid) {

 		pool = pi->set->string_pool.data;

 		*property = p;

 		*name = &pool[p->name];

 		*relation = p->relation;

 		*version = &pool[p->version];

 		*type = p->type;

 	} else {

 		*property = NULL;

 	}

 	return valid;

 }

 void

 razor_property_iterator_destroy(struct razor_property_iterator *pi)

 {

 	free(pi);

 }

 static struct razor_entry *

 find_entry(struct razor_set *set, struct razor_entry *dir, const char *pattern)

 {

 	struct razor_entry *e;

 	const char *n, *pool = set->string_pool.data;

 	int len;

 	e = (struct razor_entry *) set->files.data + dir->start;

 	do {

 		n = pool + e->name;

 		if (strcmp(pattern + 1, n) == 0)

 			return e;

 		len = strlen(n);

 		if (e->start != 0 && strncmp(pattern + 1, n, len) == 0 &&

 		    pattern[len + 1] == '/') {

 			return find_entry(set, e, pattern + len + 1);

 		}

 	} while (!((e++)->flags & RAZOR_ENTRY_LAST));

 	return NULL;

 }

 static void

 list_dir(struct razor_set *set, struct razor_entry *dir,

 	 char *prefix, const char *pattern)

 {

 	struct razor_entry *e;

 	const char *n, *pool = set->string_pool.data;

 	e = (struct razor_entry *) set->files.data + dir->start;

 	do {

 		n = pool + e->name;

 		if (pattern && pattern[0] && fnmatch(pattern, n, 0) != 0)

 			continue;

 		printf("%s/%s\n", prefix, n);

 		if (e->start) {

 			char *sub = prefix + strlen (prefix);

 			*sub = '/';

 			strcpy (sub + 1, n);

 			list_dir(set, e, prefix, pattern);

 			*sub = '\0';

 		}

 	} while (!((e++)->flags & RAZOR_ENTRY_LAST));

 }

 void

 razor_set_list_files(struct razor_set *set, const char *pattern)

 {

 	struct razor_entry *e;

 	char buffer[512], *p, *base;

 	if (pattern == NULL || !strcmp (pattern, "/")) {

 		buffer[0] = '\0';

 		list_dir(set, set->files.data, buffer, NULL);

 		return;

 	}

 	strcpy(buffer, pattern);

 	e = find_entry(set, set->files.data, buffer);

 	if (e && e->start > 0) {

 		base = NULL;

 	} else {

 		p = strrchr(buffer, '/');

 		if (p) {

 			*p = '\0';

 			base = p + 1;

 		} else {

 			base = NULL;

 		}

 	}

 	e = find_entry(set, set->files.data, buffer);

 	if (e->start != 0)

 		list_dir(set, e, buffer, base);

 }

 struct razor_package_iterator *

 razor_package_iterator_create_for_file(struct razor_set *set,

 				       const char *filename)

 {

 	struct razor_entry *entry;

 	struct list *index;

 	entry = find_entry(set, set->files.data, filename);

 	if (entry == NULL)

 		return NULL;

 	index = list_first(&entry->packages, &set->package_pool);

 	return razor_package_iterator_create_with_index(set, index);

 }

 static struct list *

 list_package_files(struct razor_set *set, struct list *r,

 		   struct razor_entry *dir, uint32_t end,

 		   char *prefix)

 {

 	struct razor_entry *e, *f, *entries;

 	uint32_t next, file;

 	char *pool;

 	int len;

 	entries = (struct razor_entry *) set->files.data;

 	pool = set->string_pool.data;

 	e = entries + dir->start;

 	do {

 		if (entries + r->data == e) {

 			printf("%s/%s\n", prefix, pool + e->name);

 			r = list_next(r);

 			if (!r)

 				return NULL;

 			if (r->data >= end)

 				return r;

 		}

 	} while (!((e++)->flags & RAZOR_ENTRY_LAST));

 	e = entries + dir->start;

 	do {

 		if (e->start == 0)

 			continue;

 		if (e->flags & RAZOR_ENTRY_LAST)

 			next = end;

 		else {

 			f = e + 1; 

 			while (f->start == 0 && !(f->flags & RAZOR_ENTRY_LAST))

 				f++;

 			if (f->start == 0)

 				next = end;

 			else

 				next = f->start;

 		}

 		file = r->data;

 		if (e->start <= file && file < next) {

 			len = strlen(prefix);

 			prefix[len] = '/';

 			strcpy(prefix + len + 1, pool + e->name);

 			r = list_package_files(set, r, e, next, prefix);

 			prefix[len] = '\0';

 		}

 	} while (!((e++)->flags & RAZOR_ENTRY_LAST) && r != NULL);

 	return r;

 }

 void

 razor_set_list_package_files(struct razor_set *set, const char *name)

 {

 	struct razor_package *package;

 	struct list *r;

 	uint32_t end;

 	char buffer[512];

 	package = razor_set_get_package(set, name);

 	r = list_first(&package->files, &set->file_pool);

 	end = set->files.size / sizeof (struct razor_entry);

 	buffer[0] = '\0';

 	list_package_files(set, r, set->files.data, end, buffer);

 }

 #define UPSTREAM_SOURCE 0x80

 struct source {

 	struct razor_set *set;

 	uint32_t *property_map;

 	uint32_t *file_map;

 };

 struct razor_merger {

 	struct razor_set *set;

 	struct hashtable table;

 	struct source source1;

 	struct source source2;

 };

 static struct razor_merger *

 razor_merger_create(struct razor_set *set1, struct razor_set *set2)

 {

 	struct razor_merger *merger;

 	int count;

 	size_t size;

 	merger = zalloc(sizeof *merger);

 	merger->set = razor_set_create();

 	hashtable_init(&merger->table, &merger->set->string_pool);

 	merger->source1.set = set1;

 	count = set1->properties.size / sizeof (struct razor_property);

 	size = count * sizeof merger->source1.property_map[0];

 	merger->source1.property_map = zalloc(size);

 	count = set1->files.size / sizeof (struct razor_entry);

 	size = count * sizeof merger->source1.file_map[0];

 	merger->source1.file_map = zalloc(size);

 	merger->source2.set = set2;

 	count = set2->properties.size / sizeof (struct razor_property);

 	size = count * sizeof merger->source2.property_map[0];

 	merger->source2.property_map = zalloc(size);

 	count = set2->files.size / sizeof (struct razor_entry);

 	size = count * sizeof merger->source2.file_map[0];

 	merger->source2.file_map = zalloc(size);

 	return merger;

 }

 static void

 razor_merger_add_package(struct razor_merger *merger,

 			 struct razor_package *package)

 {

 	char *pool;

 	struct list *r;

 	struct razor_package *p;

 	struct razor_set *set1;

 	struct source *source;

 	uint32_t flags;

 	set1 = merger->source1.set;

 	if (set1->packages.data <= (void *) package &&

 	    (void *) package < set1->packages.data + set1->packages.size) {

 		source = &merger->source1;

 		flags = 0;

 	} else {

 		source = &merger->source2;

 		flags = UPSTREAM_SOURCE;

 	}

 	pool = source->set->string_pool.data;

 	p = array_add(&merger->set->packages, sizeof *p);

 	p->name = hashtable_tokenize(&merger->table, &pool[package->name]);

 	p->flags = flags;

 	p->version = hashtable_tokenize(&merger->table,

 					&pool[package->version]);

 	p->arch = hashtable_tokenize(&merger->table,

 				     &pool[package->arch]);

 	p->properties = package->properties;

 	r = list_first(&package->properties, &source->set->property_pool);

 	while (r) {

 		source->property_map[r->data] = 1;

 		r = list_next(r);

 	}

 	p->files = package->files;

 	r = list_first(&package->files, &source->set->file_pool);

 	while (r) {

 		source->file_map[r->data] = 1;

 		r = list_next(r);

 	}

 }

 static uint32_t

 add_property(struct razor_merger *merger,

 	     const char *name, enum razor_version_relation relation,

 	     const char *version, int type)

 {

 	struct razor_property *p;

 	p = array_add(&merger->set->properties, sizeof *p);

 	p->name = hashtable_tokenize(&merger->table, name);

 	p->flags = 0;

 	p->type = type;

 	p->relation = relation;

 	p->version = hashtable_tokenize(&merger->table, version);

 	return p - (struct razor_property *) merger->set->properties.data;

 }

 static void

 merge_properties(struct razor_merger *merger)

 {

 	struct razor_property *p1, *p2;

 	struct razor_set *set1, *set2;

 	uint32_t *map1, *map2;

 	int i, j, cmp, count1, count2;

 	char *pool1, *pool2;

 	set1 = merger->source1.set;

 	set2 = merger->source2.set;

 	map1 = merger->source1.property_map;

 	map2 = merger->source2.property_map;

 	i = 0;

 	j = 0;

 	pool1 = set1->string_pool.data;

 	pool2 = set2->string_pool.data;

 	count1 = set1->properties.size / sizeof *p1;

 	count2 = set2->properties.size / sizeof *p2;

 	while (i < count1 || j < count2) {

 		if (i < count1 && map1[i] == 0) {

 			i++;

 			continue;

 		}

 		if (j < count2 && map2[j] == 0) {

 			j++;

 			continue;

 		}

 		p1 = (struct razor_property *) set1->properties.data + i;

 		p2 = (struct razor_property *) set2->properties.data + j;

 		if (i < count1 && j < count2)

 			cmp = strcmp(&pool1[p1->name], &pool2[p2->name]);

 		else if (i < count1)

 			cmp = -1;

 		else

 			cmp = 1;

 		if (cmp == 0)

 			cmp = p1->type - p2->type;

 		if (cmp == 0)

 			cmp = p1->relation - p2->relation;

 		if (cmp == 0)

 			cmp = versioncmp(&pool1[p1->version],

 					 &pool2[p2->version]);

 		if (cmp < 0) {

 			map1[i++] = add_property(merger,

 						 &pool1[p1->name],

 						 p1->relation,

 						 &pool1[p1->version],

 						 p1->type);

 		} else if (cmp > 0) {

 			map2[j++] = add_property(merger,

 						 &pool2[p2->name],

 						 p2->relation,

 						 &pool2[p2->version],

 						 p2->type);

 		} else  {

 			map1[i++] = map2[j++] = add_property(merger,

 							     &pool1[p1->name],

 							     p1->relation,

 							     &pool1[p1->version],

 							     p1->type);

 		}

 	}

 }

 static void

 emit_properties(struct list_head *properties, struct array *source_pool,

 		uint32_t *map, struct array *pool)

 {

 	uint32_t r;

 	struct list *p, *q;

 	r = pool->size / sizeof *q;

 	p = list_first(properties, source_pool);

 	while (p) {

 		q = array_add(pool, sizeof *q);

 		q->data = map[p->data];

 		q->flags = p->flags;

 		p = list_next(p);

 	}

 	list_set_ptr(properties, r);

 }

 static uint32_t

 add_file(struct razor_merger *merger, const char *name)

 {

 	struct razor_entry *e;

 	e = array_add(&merger->set->files, sizeof *e);

 	e->name = hashtable_tokenize(&merger->table, name);

 	e->flags = 0;

 	e->start = 0;

 	return e - (struct razor_entry *)merger->set->files.data;

 }

 /* FIXME. Blah */

 static int

 fix_file_map(uint32_t *map,

 	     struct razor_entry *files,

 	     struct razor_entry *top)

 {

 	uint32_t e;

 	int found_file = 0;

 	e = top->start;

 	do {

 		if (files[e].start)

 			fix_file_map(map, files, &files[e]);

 		if (map[e])

 			found_file = 1;

 	} while (!(files[e++].flags & RAZOR_ENTRY_LAST));

 	if (found_file)

 		map[top - files] = 1;

 	return found_file;

 }

 struct merge_directory {

 	uint32_t merged, dir1, dir2;

 };

 static void

 merge_one_directory(struct razor_merger *merger, struct merge_directory *md)

 {

 	struct razor_entry *root1, *root2, *mroot, *e1, *e2;

 	struct razor_set *set1, *set2;

 	struct array merge_stack;

 	struct merge_directory *child_md, *end_md;

 	uint32_t *map1, *map2, start, last;

 	int cmp;

 	char *pool1, *pool2;

 	set1 = merger->source1.set;

 	set2 = merger->source2.set;

 	map1 = merger->source1.file_map;

 	map2 = merger->source2.file_map;

 	pool1 = set1->string_pool.data;

 	pool2 = set2->string_pool.data;

 	root1 = (struct razor_entry *) set1->files.data;

 	root2 = (struct razor_entry *) set2->files.data;

 	array_init(&merge_stack);

 	start = merger->set->files.size / sizeof (struct razor_entry);

 	last = 0;

 	e1 = md->dir1 ? root1 + md->dir1 : NULL;

 	e2 = md->dir2 ? root2 + md->dir2 : NULL;

 	while (e1 || e2) {

 		if (!e2 && !map1[e1 - root1]) {

 			if ((e1++)->flags & RAZOR_ENTRY_LAST)

 				e1 = NULL;

 			continue;

 		}

 		if (!e1 && !map2[e2 - root2]) {

 			if ((e2++)->flags & RAZOR_ENTRY_LAST)

 				e2 = NULL;

 			continue;

 		}

 		if (e1 && !map1[e1 - root1] &&

 		    e2 && !map1[e2 - root2]) {

 			if ((e1++)->flags & RAZOR_ENTRY_LAST)

 				e1 = NULL;

 			if ((e2++)->flags & RAZOR_ENTRY_LAST)

 				e2 = NULL;

 			continue;

 		}

 		if (!e1)

 			cmp = 1;

 		else if (!e2)

 			cmp = -1;

 		else {

 			cmp = strcmp (&pool1[e1->name],

 				      &pool2[e2->name]);

 		}

 		if (cmp < 0) {

 			if (map1[e1 - root1]) {

 				map1[e1 - root1] = last =

 					add_file(merger, &pool1[e1->name]);

 				if (e1->start) {

 					child_md = array_add(&merge_stack, sizeof (struct merge_directory));

 					child_md->merged = last;

 					child_md->dir1 = e1->start;

 					child_md->dir2 = 0;

 				}

 			}

 			if ((e1++)->flags & RAZOR_ENTRY_LAST)

 				e1 = NULL;

 		} else if (cmp > 0) {

 			if (map2[e2 - root2]) {

 				map2[e2 - root2] = last =

 					add_file(merger, &pool2[e2->name]);

 				if (e2->start) {

 					child_md = array_add(&merge_stack, sizeof (struct merge_directory));

 					child_md->merged = last;

 					child_md->dir1 = 0;

 					child_md->dir2 = e2->start;

 				}

 			}

 			if ((e2++)->flags & RAZOR_ENTRY_LAST)

 				e2 = NULL;

 		} else {

 			map1[e1 - root1] = map2[e2- root2] = last =

 				add_file(merger, &pool1[e1->name]);

 			if (e1->start || e2->start) {

 				child_md = array_add(&merge_stack, sizeof (struct merge_directory));

 				child_md->merged = last;

 				child_md->dir1 = e1->start;

 				child_md->dir2 = e2->start;

 			}

 			if ((e1++)->flags & RAZOR_ENTRY_LAST)

 				e1 = NULL;

 			if ((e2++)->flags & RAZOR_ENTRY_LAST)

 				e2 = NULL;

 		}

 	}

 	mroot = (struct razor_entry *)merger->set->files.data;

 	if (last) {

 		mroot[last].flags = RAZOR_ENTRY_LAST;

 		mroot[md->merged].start = start;

 	} else

 		mroot[md->merged].start = 0;

 	end_md = merge_stack.data + merge_stack.size;

 	for (child_md = merge_stack.data; child_md < end_md; child_md++)

 		merge_one_directory(merger, child_md);

 	array_release(&merge_stack);

 }

 static void

 merge_files(struct razor_merger *merger)

 {

 	struct razor_entry *root;

 	struct merge_directory md;

 	uint32_t *map1, *map2;

 	map1 = merger->source1.file_map;

 	map2 = merger->source2.file_map;

 	md.merged = 0;

 	if (merger->source1.set->files.size) {

 		root = (struct razor_entry *) merger->source1.set->files.data;

 		if (root->start)

 			fix_file_map(map1, root, root);

 		md.dir1 = root->start;

 	} else

 		md.dir1 = 0;

 	if (merger->source2.set->files.size) {

 		root = (struct razor_entry *) merger->source2.set->files.data;

 		if (root->start)

 			fix_file_map(map2, root, root);

 		md.dir2 = root->start;

 	} else

 		md.dir2 = 0;

 	merge_one_directory(merger, &md);

 }

 static void

 emit_files(struct list_head *files, struct array *source_pool,

 	   uint32_t *map, struct array *pool)

 {

 	uint32_t r;

 	struct list *p, *q;

 	r = pool->size / sizeof *q;

 	p = list_first(files, source_pool);

 	while (p) {

 		q = array_add(pool, sizeof *q);

 		q->data = map[p->data];

 		q->flags = p->flags;

 		p = list_next(p);

 	}

 	list_set_ptr(files, r);

 }

 /* Rebuild property->packages maps.  We can't just remap these, as a

  * property may have lost or gained a number of packages.  Allocate an

  * array per property and loop through the packages and add them to

  * the arrays for their properties. */

 static void

 rebuild_property_package_lists(struct razor_set *set)

 {

 	struct array *pkgs, *a;

 	struct razor_package *pkg, *pkg_end;

 	struct razor_property *prop, *prop_end;

 	struct list *r;

 	uint32_t *q;

 	int count;

 	count = set->properties.size / sizeof (struct razor_property);

 	pkgs = zalloc(count * sizeof *pkgs);

 	pkg_end = set->packages.data + set->packages.size;

 	for (pkg = set->packages.data; pkg < pkg_end; pkg++) {

 		r = list_first(&pkg->properties, &set->property_pool);

 		while (r) {

 			q = array_add(&pkgs[r->data], sizeof *q);

 			*q = pkg - (struct razor_package *) set->packages.data;

 			r = list_next(r);

 		}

 	}

 	prop_end = set->properties.data + set->properties.size;

 	a = pkgs;

 	for (prop = set->properties.data; prop < prop_end; prop++, a++) {

 		list_set_array(&prop->packages, &set->package_pool, a, 0);

 		array_release(a);

 	}

 	free(pkgs);

 }

 static void

 rebuild_file_package_lists(struct razor_set *set)

 {

 	struct array *pkgs, *a;

 	struct razor_package *pkg, *pkg_end;

 	struct razor_entry *entry, *entry_end;

 	struct list *r;

 	uint32_t *q;

 	int count;

 	count = set->files.size / sizeof (struct razor_entry);

 	pkgs = zalloc(count * sizeof *pkgs);

 	pkg_end = set->packages.data + set->packages.size;

 	for (pkg = set->packages.data; pkg < pkg_end; pkg++) {

 		r = list_first(&pkg->files, &set->file_pool);

 		while (r) {

 			q = array_add(&pkgs[r->data], sizeof *q);

 			*q = pkg - (struct razor_package *) set->packages.data;

 			r = list_next(r);

 		}

 	}

 	entry_end = set->files.data + set->files.size;

 	a = pkgs;

 	for (entry = set->files.data; entry < entry_end; entry++, a++) {

 		list_set_array(&entry->packages, &set->package_pool, a, 0);

 		array_release(a);

 	}

 	free(pkgs);

 }

 static struct razor_set *

 razor_merger_finish(struct razor_merger *merger)

 {

 	struct razor_set *result;

 	struct razor_package *p, *pend;

 	/* As we built the package list, we filled out a bitvector of

 	 * the properties that are referenced by the packages in the

 	 * new set.  Now we do a parallel loop through the properties

 	 * and emit those marked in the bit vector to the new set.  In

 	 * the process, we update the bit vector to actually map from

 	 * indices in the old property list to indices in the new

 	 * property list for both sets. */

 	merge_properties(merger);

 	merge_files(merger);

 	/* Now we loop through the packages again and emit the

 	 * property lists, remapped to point to the new properties. */

 	pend = merger->set->packages.data + merger->set->packages.size;

 	for (p = merger->set->packages.data; p < pend; p++) {

 		struct source *src;

 		if (p->flags & UPSTREAM_SOURCE)

 			src = &merger->source2;

 		else

 			src = &merger->source1;

 		emit_properties(&p->properties,

 				&src->set->property_pool,

 				src->property_map,

 				&merger->set->property_pool);

 		emit_files(&p->files,

 			   &src->set->file_pool,

 			   src->file_map,

 			   &merger->set->file_pool);

 		p->flags &= ~UPSTREAM_SOURCE;

 	}

 	rebuild_property_package_lists(merger->set);

 	rebuild_file_package_lists(merger->set);

 	result = merger->set;

 	hashtable_release(&merger->table);

 	free(merger);

 	return result;

 }

 /* The diff order matters.  We should sort the packages so that a

  * REMOVE of a package comes before the INSTALL, and so that all

  * requires for a package have been installed before the package.

  **/

 void

 razor_set_diff(struct razor_set *set, struct razor_set *upstream,

 	       razor_package_callback_t callback, void *data)

 {

  	struct razor_package_iterator *pi1, *pi2;

  	struct razor_package *p1, *p2;

 	const char *name1, *name2, *version1, *version2, *arch1, *arch2;

 	int res;

 	pi1 = razor_package_iterator_create(set);

 	pi2 = razor_package_iterator_create(upstream);

 	razor_package_iterator_next(pi1, &p1, &name1, &version1, &arch1);

 	razor_package_iterator_next(pi2, &p2, &name2, &version2, &arch2);

 	while (p1 || p2) {

 		if (p1 && p2) {

 			res = strcmp(name1, name2);

 			if (res == 0)

 				res = versioncmp(version1, version2);

 		} else {

 			res = 0;

 		}

 		if (p2 == NULL || res < 0)

 			callback(name1, version1, NULL, arch1, data);

 		else if (p1 == NULL || res > 0)

 			callback(name2, NULL, version2, arch2, data);

 		if (p1 != NULL && res <= 0)

 			razor_package_iterator_next(pi1, &p1,

 						    &name1, &version1, &arch1);

 		if (p2 != NULL && res >= 0)

 			razor_package_iterator_next(pi2, &p2,

 						    &name2, &version2, &arch2);

 	}

 	razor_package_iterator_destroy(pi1);

 	razor_package_iterator_destroy(pi2);

 }

 static int

 provider_satisfies_requirement(struct razor_property *provider,

 			       const char *provider_strings,

 			       enum razor_version_relation relation,

 			       const char *required)

 {

 	int cmp, len;

 	const char *provided = &provider_strings[provider->version];

 	if (!*required)

 		return 1;

 	if (!*provided) {

 		if (relation >= RAZOR_VERSION_EQUAL)

 			return 1;

 		else

 			return 0;

 	}

 	cmp = versioncmp(provided, required);

 	switch (relation) {

 	case RAZOR_VERSION_LESS:

 		return cmp < 0;

 	case RAZOR_VERSION_LESS_OR_EQUAL:

 		if (cmp <= 0)

 			return 1;

 		/* fall through: FIXME, make sure this is correct */

 	case RAZOR_VERSION_EQUAL:

 		if (cmp == 0)

 			return 1;

 		/* "foo == 1.1" is satisfied by "foo 1.1-2" */

 		len = strlen(required);

 		if (!strncmp(required, provided, len) && provided[len] == '-')

 			return 1;

 		return 0;

 	case RAZOR_VERSION_GREATER_OR_EQUAL:

 		return cmp >= 0;

 	case RAZOR_VERSION_GREATER:

 		return cmp > 0;

 	}

 	/* shouldn't happen */

 	return 0;

 }

 #define TRANS_PACKAGE_PRESENT		1

 #define TRANS_PACKAGE_UPDATE		2

 #define TRANS_PROPERTY_SATISFIED	0x80000000

 struct transaction_set {

 	struct razor_set *set;

 	uint32_t *packages;

 	uint32_t *properties;

 };

 struct razor_transaction {

 	int package_count, errors;

 	struct transaction_set system, upstream;

 	int changes;

 };

 static void

 transaction_set_init(struct transaction_set *ts, struct razor_set *set)

 {

 	int count;

 	ts->set = set;

 	count = set->packages.size / sizeof (struct razor_package);

 	ts->packages = zalloc(count * sizeof *ts->packages);

 	count = set->properties.size / sizeof (struct razor_property);

 	ts->properties = zalloc(count * sizeof *ts->properties);

 }

 static void

 transaction_set_release(struct transaction_set *ts)

 {

 	free(ts->packages);

 	free(ts->properties);

 }

 static void

 transaction_set_install_package(struct transaction_set *ts,

 				struct razor_package *package)

 {

 	struct razor_package *pkgs;

 	struct list *prop;

 	int i;

 	pkgs = ts->set->packages.data;

 	i = package - pkgs;

 	if (ts->packages[i] == TRANS_PACKAGE_PRESENT)

 		return;

 	ts->packages[i] = TRANS_PACKAGE_PRESENT;

 	prop = list_first(&package->properties, &ts->set->property_pool);

 	while (prop) {

 		ts->properties[prop->data]++;

 		prop = list_next(prop);

 	}

 }

 static void

 transaction_set_remove_package(struct transaction_set *ts,

 			       struct razor_package *package)

 {

 	struct razor_package *pkgs;

 	struct list *prop;

 	int i;

 	pkgs = ts->set->packages.data;

 	i = package - pkgs;

 	if (ts->packages[i] == 0)

 		return;

 	ts->packages[i] = 0;

 	prop = list_first(&package->properties, &ts->set->property_pool);

 	while (prop) {

 		ts->properties[prop->data]--;

 		prop = list_next(prop);

 	}

 }

 struct razor_transaction *

 razor_transaction_create(struct razor_set *system, struct razor_set *upstream)

 {

 	struct razor_transaction *trans;

 	struct razor_package *p, *spkgs, *pend;

 	trans = zalloc(sizeof *trans);

 	transaction_set_init(&trans->system, system);

 	transaction_set_init(&trans->upstream, upstream);

 	spkgs = trans->system.set->packages.data;

 	pend = trans->system.set->packages.data +

 		trans->system.set->packages.size;

 	for (p = spkgs; p < pend; p++)

 		transaction_set_install_package(&trans->system, p);

 	return trans;

 }

 void

 razor_transaction_install_package(struct razor_transaction *trans,

 				  struct razor_package *package)

 {

 	transaction_set_install_package(&trans->upstream, package);

 	trans->changes++;

 }

 void

 razor_transaction_remove_package(struct razor_transaction *trans,

 				 struct razor_package *package)

 {

 	transaction_set_remove_package(&trans->system, package);

 	trans->changes++;

 }

 void

 razor_transaction_update_package(struct razor_transaction *trans,

 				  struct razor_package *package)

 {

 	struct razor_package *spkgs;

 	spkgs = trans->system.set->packages.data;

 	trans->system.packages[package - spkgs] |= TRANS_PACKAGE_UPDATE;

 }

 struct prop_iter {

 	struct razor_property *p, *start, *end;

 	const char *pool;

 	uint32_t *present;

 };

 static void

 prop_iter_init(struct prop_iter *pi, struct transaction_set *ts)

 {

 	pi->p = ts->set->properties.data;

 	pi->start = ts->set->properties.data;

 	pi->end = ts->set->properties.data + ts->set->properties.size;

 	pi->pool = ts->set->string_pool.data;

 	pi->present = ts->properties;

 }

 static int

 prop_iter_next(struct prop_iter *pi,

 	       enum razor_property_type type, struct razor_property **p)

 {

 	while (pi->p < pi->end) {

 		if ((pi->present[pi->p - pi->start] & ~TRANS_PROPERTY_SATISFIED) &&

 		    pi->p->type == type) {

 			*p = pi->p++;

 			return 1;

 		}

 		pi->p++;

 	}

 	return 0;

 }

 static struct razor_property *

 prop_iter_seek_to(struct prop_iter *pi,

 		  enum razor_property_type type, const char *match)

 {

 	uint32_t name;

 	while (pi->p < pi->end && strcmp(&pi->pool[pi->p->name], match) < 0)

 		pi->p++;

 	if (pi->p == pi->end || strcmp(&pi->pool[pi->p->name], match) > 0)

 		return NULL;

 	name = pi->p->name;

 	while (pi->p < pi->end &&

 	       pi->p->name == name &&

 	       pi->p->type != type)

 		pi->p++;

 	if (pi->p == pi->end || pi->p->name != name)

 		return NULL;

 	return pi->p;

 }

 /* Remove packages from set that provide any of the matching (same

  * name and type) providers from ppi onwards that match the

  * requirement that rpi points to. */

 static void

 remove_matching_providers(struct razor_transaction *trans,

 			  struct prop_iter *ppi,

 			  enum razor_version_relation relation,

 			  const char *version)

 {

 	struct razor_property *p;

 	struct razor_package *pkg, *pkgs;

 	struct razor_package_iterator pkg_iter;

 	struct razor_set *set;

 	const char *n, *v, *a;

 	if (ppi->present == trans->system.properties)

 		set = trans->system.set;

 	else

 		set = trans->upstream.set;

 	pkgs = (struct razor_package *) set->packages.data;

 	for (p = ppi->p; 

 	     p < ppi->end && 

 	     p->name == ppi->p->name &&

 	     p->type == ppi->p->type;

 	     p++) {

 		if (!ppi->present[p - ppi->start])

 			continue;

 		if (!provider_satisfies_requirement(p, ppi->pool,

 						    relation, version))

 			continue;

 		razor_package_iterator_init_for_property(&pkg_iter, set, p);

 		while (razor_package_iterator_next(&pkg_iter,

 						   &pkg, &n, &v, &a)) {

 			fprintf(stderr, "removing %s-%s\n", n, v);

 			razor_transaction_remove_package(trans, pkg);

 		}

 	}

 }

 static void

 flag_matching_providers(struct razor_transaction *trans,

 			struct prop_iter *ppi,

 			struct razor_property *r,

 			struct prop_iter *rpi,

 			unsigned int flag)

 {

 	struct razor_property *p;

 	struct razor_package *pkg, *pkgs;

 	struct razor_package_iterator pkg_iter;

 	struct razor_set *set;

 	const char *name, *version, *arch;

 	uint32_t *flags;

 	if (ppi->present == trans->system.properties) {

 		set = trans->system.set;

 		flags = trans->system.packages;

 	} else {

 		set = trans->upstream.set;

 		flags = trans->upstream.packages;

 	}

 	pkgs = (struct razor_package *) set->packages.data;

 	for (p = ppi->p; 

 	     p < ppi->end && 

 		     p->name == ppi->p->name &&

 		     p->type == ppi->p->type;

 	     p++) {

 		if (!ppi->present[p - ppi->start])

 			continue;

 		if (!provider_satisfies_requirement(p, ppi->pool,

 						    r->relation,

 						    &rpi->pool[r->version]))

 			continue;

 		razor_package_iterator_init_for_property(&pkg_iter, set, p);

 		while (razor_package_iterator_next(&pkg_iter, &pkg,

 						   &name, &version, &arch)) {

 			fprintf(stderr, "flagging %s-%s for providing %s matching %s %s\n",

 				name, version,

 				ppi->pool + p->name,

 				rpi->pool + r->name,

 				rpi->pool + r->version);

 			flags[pkg - pkgs] |= flag;

 		}

 	}

 }

 static struct razor_package *

 pick_matching_provider(struct razor_set *set,

 		       struct prop_iter *ppi,

 		       enum razor_version_relation relation,

 		       const char *version)

 {

 	struct razor_property *p;

 	struct razor_package *pkgs;

 	struct list *i;

 	/* This is where we decide which pkgs to pull in to satisfy a

 	 * requirement.  There may be several different providers

 	 * (different versions) and each version of a provider may

 	 * come from a number of packages.  We pick the first package

 	 * from the first provider that matches. */

 	pkgs = set->packages.data;

 	for (p = ppi->p;

 	     p < ppi->end &&

 		     p->name == ppi->p->name &&

 		     p->type == ppi->p->type &&

 		     ppi->present[p - ppi->start] == 0;

 	     p++) {

 		if (!provider_satisfies_requirement(p, ppi->pool,

 						    relation, version))

 			continue;

 		i = list_first(&p->packages, &set->package_pool);

 		return &pkgs[i->data];

 	}

 	return NULL;

 }

 static void

 remove_obsoleted_packages(struct razor_transaction *trans)

 {

 	struct razor_property *up;

 	struct razor_package *spkgs;

 	struct prop_iter spi, upi;

 	spkgs = trans->system.set->packages.data;

 	prop_iter_init(&spi, &trans->system);

 	prop_iter_init(&upi, &trans->upstream);

 	while (prop_iter_next(&upi, RAZOR_PROPERTY_OBSOLETES, &up)) {

 		if (!prop_iter_seek_to(&spi, RAZOR_PROPERTY_PROVIDES,

 				       &upi.pool[up->name]))

 			continue;

 		remove_matching_providers(trans, &spi, up->relation,

 					  &upi.pool[up->version]);

 	}

 }

 static int

 any_provider_satisfies_requirement(struct prop_iter *ppi,

 				   enum razor_version_relation relation,

 				   const char *version)

 {

 	struct razor_property *p;

 	for (p = ppi->p;

 	     p < ppi->end &&

 		     p->name == ppi->p->name &&

 		     p->type == ppi->p->type;

 	     p++) {

 		if (ppi->present[p - ppi->start] > 0 &&

 		    provider_satisfies_requirement(p, ppi->pool,

 						   relation, version))

 			return 1;

 	}

 	return 0;

 }

 static void

 clear_requires_flags(struct transaction_set *ts)

 {

 	struct razor_property *p;

 	const char *pool;

 	int i, count;

 	count = ts->set->properties.size / sizeof *p;

 	p = ts->set->properties.data;

 	pool = ts->set->string_pool.data;

 	for (i = 0; i < count; i++) {

 		ts->properties[i] &= ~TRANS_PROPERTY_SATISFIED;

 		if (strncmp(&pool[p[i].name], "rpmlib(", 7) == 0)

 			ts->properties[i] |= TRANS_PROPERTY_SATISFIED;

 	}

 }

 static void

 mark_satisfied_requires(struct razor_transaction *trans,

 			struct transaction_set *rts,

 			struct transaction_set *pts)

 {

 	struct prop_iter rpi, ppi;

 	struct razor_property *rp;

 	prop_iter_init(&rpi, rts);

 	prop_iter_init(&ppi, pts);

 	while (prop_iter_next(&rpi, RAZOR_PROPERTY_REQUIRES, &rp)) {

 		if (!prop_iter_seek_to(&ppi, RAZOR_PROPERTY_PROVIDES,

 				       &rpi.pool[rp->name]))

 			continue;

 		if (any_provider_satisfies_requirement(&ppi, rp->relation,

 						       &rpi.pool[rp->version]))

 			rpi.present[rp - rpi.start] |= TRANS_PROPERTY_SATISFIED;

 	}

 }

 static const char *relation_string[] = { "<", "<=", "=", ">=", ">" };

 static void

 mark_all_satisfied_requires(struct razor_transaction *trans)

 {

 	struct razor_property *sp;

 	struct prop_iter spi;

 	clear_requires_flags(&trans->system);

 	clear_requires_flags(&trans->upstream);

 	mark_satisfied_requires(trans, &trans->system, &trans->system);

 	mark_satisfied_requires(trans, &trans->system, &trans->upstream);

 	mark_satisfied_requires(trans, &trans->upstream, &trans->system);

 	mark_satisfied_requires(trans, &trans->upstream, &trans->upstream);

 	prop_iter_init(&spi, &trans->system);

 	while (prop_iter_next(&spi, RAZOR_PROPERTY_REQUIRES, &sp)) {

 		if (spi.present[sp - spi.start] & TRANS_PROPERTY_SATISFIED)

 			continue;

 		fprintf(stderr, "unsatisfied system requires: %s %s %s\n",

 			spi.pool + sp->name,

 			relation_string[sp->relation],

 			spi.pool + sp->version);

 	}

 	prop_iter_init(&spi, &trans->upstream);

 	while (prop_iter_next(&spi, RAZOR_PROPERTY_REQUIRES, &sp)) {

 		if (spi.present[sp - spi.start] & TRANS_PROPERTY_SATISFIED)

 			continue;

 		fprintf(stderr, "unsatisfied upstream requires: %s %s %s\n",

 			spi.pool + sp->name,

 			relation_string[sp->relation],

 			spi.pool + sp->version);

 	}

 }

 static void

 update_unsatisfied_packages(struct razor_transaction *trans)

 {

 	struct razor_package *spkgs, *pkg;

 	struct razor_property *sp;

 	struct prop_iter spi;

 	struct razor_package_iterator pkg_iter;

 	const char *name, *version, *arch;

 	spkgs = trans->system.set->packages.data;

 	prop_iter_init(&spi, &trans->system);

 	while (prop_iter_next(&spi, RAZOR_PROPERTY_REQUIRES, &sp)) {

 		if (spi.present[sp - spi.start] & TRANS_PROPERTY_SATISFIED)

 			continue;

 		razor_package_iterator_init_for_property(&pkg_iter,

 							 trans->system.set,

 							 sp);

 		while (razor_package_iterator_next(&pkg_iter, &pkg,

 						   &name, &version, &arch)) {

 			fprintf(stderr, "updating %s because %s %s %s "

 				"isn't satisfied\n",

 				name, spi.pool + sp->name,

 				relation_string[sp->relation],

 				spi.pool + sp->version);

 			trans->system.packages[pkg - spkgs] |=

 				TRANS_PACKAGE_UPDATE;

 		}

 	}

 }

 void

 razor_transaction_update_all(struct razor_transaction *trans)

 {

 	struct razor_package *p;

 	int i, count;

 	count = trans->system.set->packages.size / sizeof *p;

 	for (i = 0; i < count; i++)

 		trans->system.packages[i] |= TRANS_PACKAGE_UPDATE;

 }

 static void

 update_conflicted_packages(struct razor_transaction *trans)

 {

 	struct razor_package *pkg, *spkgs;

 	struct razor_property *up, *sp;

 	struct prop_iter spi, upi;

 	struct razor_package_iterator pkg_iter;

 	const char *name, *version, *arch;

 	spkgs = trans->system.set->packages.data;

 	prop_iter_init(&spi, &trans->system);

 	prop_iter_init(&upi, &trans->upstream);

 	while (prop_iter_next(&spi, RAZOR_PROPERTY_CONFLICTS, &sp)) {

 		if (!prop_iter_seek_to(&upi, RAZOR_PROPERTY_PROVIDES,

 				       &spi.pool[sp->name]))

 			continue;

 		if (!any_provider_satisfies_requirement(&upi, sp->relation,

 							&spi.pool[sp->version]))

 			continue;

 		razor_package_iterator_init_for_property(&pkg_iter,

 							 trans->system.set,

 							 sp);

 		while (razor_package_iterator_next(&pkg_iter, &pkg,

 						   &name, &version, &arch)) {

 			fprintf(stderr, "updating %s %s because it conflicts with %s",

 				name, version, spi.pool + sp->name);

 			trans->system.packages[pkg - spkgs] |=

 				TRANS_PACKAGE_UPDATE;

 		}

 	}

 	prop_iter_init(&spi, &trans->system);

 	prop_iter_init(&upi, &trans->upstream);

 	while (prop_iter_next(&upi, RAZOR_PROPERTY_CONFLICTS, &up)) {

 		sp = prop_iter_seek_to(&spi, RAZOR_PROPERTY_PROVIDES,

 				       &upi.pool[upi.p->name]);

 		if (sp)

 			flag_matching_providers(trans, &spi, up, &upi,

 						TRANS_PACKAGE_UPDATE);

 	}

 }

 static void

 pull_in_requirements(struct razor_transaction *trans,

 		     struct prop_iter *rpi, struct prop_iter *ppi)

 {

 	struct razor_property *rp, *pp;

 	struct razor_package *pkg, *upkgs;

 	upkgs = trans->upstream.set->packages.data;

 	while (prop_iter_next(rpi, RAZOR_PROPERTY_REQUIRES, &rp)) {

 		if (rpi->present[rp - rpi->start] & TRANS_PROPERTY_SATISFIED)

 			continue;

 		pp = prop_iter_seek_to(ppi, RAZOR_PROPERTY_PROVIDES,

 				       &rpi->pool[rp->name]);

 		if (pp == NULL)

 			continue;

 		pkg = pick_matching_provider(trans->upstream.set,

 					     ppi, rp->relation,

 					     &rpi->pool[rp->version]);

 		if (pkg == NULL)

 			continue;

 		rpi->present[rp - rpi->start] |= TRANS_PROPERTY_SATISFIED;

 		fprintf(stderr, "pulling in %s which provides %s %s %s "

 			"to satisfy %s %s %s\n",

 			ppi->pool + pkg->name,

 			ppi->pool + pp->name, 

 			relation_string[pp->relation],

 			ppi->pool + pp->version, 

 			&rpi->pool[rp->name],

 			relation_string[rp->relation],

 			&rpi->pool[rp->version]);

 		trans->upstream.packages[pkg - upkgs] |= TRANS_PACKAGE_UPDATE;

 	}

 }

 static void

 pull_in_all_requirements(struct razor_transaction *trans)

 {

 	struct prop_iter rpi, ppi;

 	struct razor_property *rp;

 	prop_iter_init(&rpi, &trans->system);

 	prop_iter_init(&ppi, &trans->upstream);

 	pull_in_requirements(trans, &rpi, &ppi);

 	prop_iter_init(&rpi, &trans->upstream);

 	prop_iter_init(&ppi, &trans->upstream);

 	pull_in_requirements(trans, &rpi, &ppi);

 	prop_iter_init(&rpi, &trans->system);

 	while (prop_iter_next(&rpi, RAZOR_PROPERTY_REQUIRES, &rp)) {

 		if (!(rpi.present[rp - rpi.start] & TRANS_PROPERTY_SATISFIED))

 			fprintf(stderr, "could not satisfy req %s %s %s\n",

 				&rpi.pool[rp->name],

 				relation_string[rp->relation],

 				&rpi.pool[rp->version]);

 	}

 	prop_iter_init(&rpi, &trans->upstream);

 	while (prop_iter_next(&rpi, RAZOR_PROPERTY_REQUIRES, &rp)) {

 		if (!(rpi.present[rp - rpi.start] & TRANS_PROPERTY_SATISFIED))

 			fprintf(stderr, "could not satisfy req %s %s %s\n",

 				&rpi.pool[rp->name],

 				relation_string[rp->relation],

 				&rpi.pool[rp->version]);

 	}

 }

 static void

 flush_scheduled_system_updates(struct razor_transaction *trans)

 {

  	struct razor_package_iterator *pi;

  	struct razor_package *p, *pkg, *spkgs;

 	struct prop_iter ppi;

 	const char *name, *version, *arch;

 	spkgs = trans->system.set->packages.data;

 	pi = razor_package_iterator_create(trans->system.set);

 	prop_iter_init(&ppi, &trans->upstream);

 	while (razor_package_iterator_next(pi, &p, &name, &version, &arch)) {

 		if (!(trans->system.packages[p - spkgs] & TRANS_PACKAGE_UPDATE))

 			continue;

 		if (!prop_iter_seek_to(&ppi, RAZOR_PROPERTY_PROVIDES, name)) {

 			fprintf(stderr, "nothing provides %s\n", name);

 			continue;

 		}

 		pkg = pick_matching_provider(trans->upstream.set, &ppi,

 					     RAZOR_VERSION_GREATER, version);

 		if (pkg == NULL) {

 			fprintf(stderr,

 				"no newer version of %s available\n", name);

 			continue;

 		}

 		fprintf(stderr, "updating %s from %s to %s\n",

 			name, version, &ppi.pool[pkg->version]);

 		razor_transaction_remove_package(trans, p);

 		razor_transaction_install_package(trans, pkg);

 	}

 	razor_package_iterator_destroy(pi);

 }

 static void

 flush_scheduled_upstream_updates(struct razor_transaction *trans)

 {

  	struct razor_package_iterator *pi;

  	struct razor_package *p, *upkgs;

 	struct prop_iter spi;

 	const char *name, *version, *arch;

 	upkgs = trans->upstream.set->packages.data;

 	pi = razor_package_iterator_create(trans->upstream.set);

 	prop_iter_init(&spi, &trans->system);

 	while (razor_package_iterator_next(pi, &p, &name, &version, &arch)) {

 		if (!(trans->upstream.packages[p - upkgs] & TRANS_PACKAGE_UPDATE))

 			continue;

 		if (!prop_iter_seek_to(&spi, RAZOR_PROPERTY_PROVIDES, name))

 			continue;

 		remove_matching_providers(trans, &spi,

 					  RAZOR_VERSION_LESS, version);

 		razor_transaction_install_package(trans, p);

 		fprintf(stderr, "installing %s-%s\n", name, version);

 	}

 }

 int

 razor_transaction_resolve(struct razor_transaction *trans)

 {

 	int last = 0;

 	flush_scheduled_system_updates(trans);

 	while (last < trans->changes) {

 		last = trans->changes;

 		remove_obsoleted_packages(trans);

 		mark_all_satisfied_requires(trans);

 		update_unsatisfied_packages(trans);

 		update_conflicted_packages(trans);

 		pull_in_all_requirements(trans);

 		flush_scheduled_system_updates(trans);

 		flush_scheduled_upstream_updates(trans);

 	}

 	return trans->changes;

 }

 int

 razor_transaction_unsatisfied_property(struct razor_transaction *trans,

 				       const char *name,

 				       enum razor_version_relation rel,

 				       const char *version,

 				       enum razor_property_type type)

 {

 	struct prop_iter pi;

 	struct razor_property *p;

 	prop_iter_init(&pi, &trans->system);

 	while (prop_iter_next(&pi, type, &p)) {

 		if (!(trans->system.properties[p - pi.start] & TRANS_PROPERTY_SATISFIED) &&

 		    p->relation == rel &&

 		    strcmp(&pi.pool[p->name], name) == 0 &&

 		    strcmp(&pi.pool[p->version], version) == 0)

 			return 1;

 	}

 	prop_iter_init(&pi, &trans->upstream);

 	while (prop_iter_next(&pi, type, &p)) {

 		if (!(trans->upstream.properties[p - pi.start] & TRANS_PROPERTY_SATISFIED) &&

 		    p->relation == rel &&

 		    strcmp(&pi.pool[p->name], name) == 0 &&

 		    strcmp(&pi.pool[p->version], version) == 0)

 			return 1;

 	}

 	return 0;

 }

 struct razor_set *

 razor_transaction_finish(struct razor_transaction *trans)

 {

 	struct razor_merger *merger;

 	struct razor_package *u, *uend, *upkgs, *s, *send, *spkgs;

 	char *upool, *spool;

 	int cmp;

 	s = trans->system.set->packages.data;

 	spkgs = trans->system.set->packages.data;

 	send = trans->system.set->packages.data +

 		trans->system.set->packages.size;

 	spool = trans->system.set->string_pool.data;

 	u = trans->upstream.set->packages.data;

 	upkgs = trans->upstream.set->packages.data;

 	uend = trans->upstream.set->packages.data +

 		trans->upstream.set->packages.size;

 	upool = trans->upstream.set->string_pool.data;

 	merger = razor_merger_create(trans->system.set, trans->upstream.set);

 	while (s < send || u < uend) {

 		if (s < send && u < uend)

 			cmp = strcmp(&spool[s->name], &upool[u->name]);

 		else if (s < send)

 			cmp = -1;

 		else

 			cmp = 1;

 		if (cmp < 0) {

 			if (trans->system.packages[s - spkgs] & TRANS_PACKAGE_PRESENT)

 				razor_merger_add_package(merger, s);

 			s++;

 		} else if (cmp == 0) {

 			if (trans->system.packages[s - spkgs] & TRANS_PACKAGE_PRESENT)

 				razor_merger_add_package(merger, s);

 			if (trans->upstream.packages[u - upkgs] & TRANS_PACKAGE_PRESENT)

 				razor_merger_add_package(merger, u);

 			s++;

 			u++;

 		} else {

 			if (trans->upstream.packages[u - upkgs] & TRANS_PACKAGE_PRESENT)

 				razor_merger_add_package(merger, u);

 			u++;

 		}

 	}

 	razor_transaction_destroy(trans);

 	return razor_merger_finish(merger);

 }

 void

 razor_transaction_destroy(struct razor_transaction *trans)

 {

 	transaction_set_release(&trans->system);

 	transaction_set_release(&trans->upstream);

 	free(trans);

 	/* FIXME: free upstream if it was created as an empty set */

 }

 struct razor_package_query {

 	struct razor_set *set;

 	char *vector;

 	int count;

 };

 struct razor_package_query *

 razor_package_query_create(struct razor_set *set)

 {

 	struct razor_package_query *pq;

 	int count;

 	pq = zalloc(sizeof *pq);

 	pq->set = set;

 	count = set->packages.size / sizeof(struct razor_package);

 	pq->vector = zalloc(count * sizeof(char));

 	return pq;

 }

 void

 razor_package_query_add_package(struct razor_package_query *pq,

 				struct razor_package *p)

 {

 	struct razor_package *packages;

 	packages = pq->set->packages.data;

 	pq->count += pq->vector[p - packages] ^ 1;

 	pq->vector[p - packages] = 1;

 }

 void

 razor_package_query_add_iterator(struct razor_package_query *pq,

 				 struct razor_package_iterator *pi)

 {

 	struct razor_package *packages, *p;

 	const char *name, *version, *arch;

 	packages = pq->set->packages.data;

 	while (razor_package_iterator_next(pi, &p, &name, &version, &arch)) {

 		pq->count += pq->vector[p - packages] ^ 1;

 		pq->vector[p - packages] = 1;

 	}

 }

 struct razor_package_iterator *

 razor_package_query_finish(struct razor_package_query *pq)

 {

 	struct razor_package_iterator *pi;

 	struct razor_set *set;

 	struct list *index;

 	int i, j, count;

 	set = pq->set;

 	count = set->packages.size / sizeof(struct razor_package);

 	index = zalloc(pq->count * sizeof *index);

 	for (i = 0, j = 0; i < count; i++) {

 		if (!pq->vector[i])

 			continue;

 		index[j].data = i;

 		if (j == pq->count - 1)

 			index[j].flags = 0x80;

 		j++;

 	}

 	free(pq);

 	pi = razor_package_iterator_create_with_index(set, index);

 	pi->free_index = 1;

 	return pi;

 }