#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;

 	struct list_head properties;

 	struct list_head files;

 };

 struct razor_property {

 	uint name  : 24;

 	uint flags : 6;

 	uint type  : 2;

 	uint32_t relation;

 	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;

 };

 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)

 {

 	return zalloc(sizeof(struct razor_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(struct razor_set *set, const char *filename)

 {

 	char data[4096];

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

 	struct array *a;

 	uint32_t offset;

 	int i, fd;

 	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;

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

 	if (fd < 0)

 		return -1;

 	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);

 	}

 	close(fd);

 	return 0;

 }

 void

 razor_importer_begin_package(struct razor_importer *importer,

 			     const char *name, const char *version)

 {

 	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);

 	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;

 }

 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 */

 }

 typedef int (*compare_with_data_func_t)(const void *p1,

 					const void *p,

 					void *data);

 struct qsort_context {

 	size_t size;

 	compare_with_data_func_t compare;

 	void *data;

 };

 static void

 qsort_swap(void *p1, void *p2, size_t size)

 {

 	char buffer[size];

 	memcpy(buffer, p1, size);

 	memcpy(p1, p2, size);

 	memcpy(p2, buffer, size);

 }

 static void

 __qsort_with_data(void *base, size_t nelem, uint32_t *map,

 		  struct qsort_context *ctx)

 {

 	void *p, *start, *end, *pivot;

 	uint32_t *mp, *mstart, *mend, tmp;

 	int left, right, result;

 	size_t size = ctx->size;

 	p = base;

 	start = base;

 	end = base + nelem * size;

 	mp = map;

 	mstart = map;

 	mend = map + nelem;

 	pivot = base + (random() % nelem) * size;

 	while (p < end) {

 		result = ctx->compare(p, pivot, ctx->data);

 		if (result < 0) {

 			qsort_swap(p, start, size);

 			tmp = *mp;

 			*mp = *mstart;

 			*mstart = tmp;

 			if (start == pivot)

 				pivot = p;

 			start += size;

 			mstart++;

 			p += size;

 			mp++;

 		} else if (result == 0) {

 			p += size;

 			mp++;

 		} else {

  			end -= size;

 			mend--;

 			qsort_swap(p, end, size);

 			tmp = *mp;

 			*mp = *mend;

 			*mend = tmp;

 			if (end == pivot)

 				pivot = p;

 		}

 	}

 	left = (start - base) / size;

 	right = (base + nelem * size - end) / size;

 	if (left > 1)

 		__qsort_with_data(base, left, map, ctx);

 	if (right > 1)

 		__qsort_with_data(end, right, mend, ctx);

 }

 uint32_t *

 qsort_with_data(void *base, size_t nelem, size_t size,

 		compare_with_data_func_t compare, void *data)

 {

 	struct qsort_context ctx;

 	uint32_t *map;

 	int i;

 	if (nelem == 0)

 		return NULL;

 	ctx.size = size;

 	ctx.compare = compare;

 	ctx.data = data;

 	map = malloc(nelem * sizeof (uint32_t));

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

 		map[i] = i;

 	__qsort_with_data(base, nelem, map, &ctx);

 	return map;

 }

 static int

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

 {

 	const char *p1, *p2;

 	long n1, n2;

 	int res;

 	n1 = strtol(s1, (char **) &p1, 0);

 	n2 = strtol(s2, (char **) &p2, 0);

 	/* 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 = 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);

 	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);

 	array_init(&importer->set->files);

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

 	e->name = root.name;

 	e->flags = RAZOR_ENTRY_LAST;

 	e->start = 1;

 	list_set_empty(&e->packages);

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

 	array_release(&importer->files);

 }

 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;

 	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 = 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);

 	build_file_tree(importer);

 	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;

 };

 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;

 }

 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)

 {

 	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];

 	} else {

 		*package = NULL;

 	}

 	return valid;

 }

 void

 razor_package_iterator_destroy(struct razor_package_iterator *pi)

 {

 	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;

 	pi = razor_package_iterator_create(set);

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

 		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);

 }

 static void

 razor_set_validate(struct razor_set *set, struct array *unsatisfied)

 {

 	struct razor_property *r, *p, *end;

 	uint32_t *u;

 	char *pool;

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

 	pool = set->string_pool.data;

 	for (r = set->properties.data, p = r; r < end; r++) {

 		if (r->type != RAZOR_PROPERTY_REQUIRES)

 			continue;

 		if (r->name != p->name) {

 			p = r;

 			while (p < end && p->name == r->name &&

 			       p->type == r->type)

 				p++;

 		}

 		/* If there is more than one version of a provides,

 		 * seek to the end for the highest version. */

 		/* FIXME: This doesn't work if we have a series of

 		 * requires a = 1, provides a = 1, requires a = 2,

 		 * provides a = 2, as the kernel and kernel-devel

 		 * does.*/

 		while (p + 1 < end && p->name == (p + 1)->name &&

 		       p->type == (p + 1)->type)

 			p++;

 		/* FIXME: We need to track property flags (<, <=, =

 		 * etc) to properly determine if a requires is

 		 * satisfied.  The current code doesn't track that the

 		 * requires a = 1 isn't satisfied by a = 2 provides. */

 		if (p == end ||

 		    p->type != RAZOR_PROPERTY_PROVIDES ||

 		    r->name != p->name ||

 		    versioncmp(&pool[r->version], &pool[p->version]) > 0) {

 			/* FIXME: We ignore file requires for now. */

 			if (pool[r->name] == '/')

 				continue;

 			u = array_add(unsatisfied, sizeof *u);

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

 		}

 	}

 }

 void

 razor_set_list_unsatisfied(struct razor_set *set)

 {

 	struct array unsatisfied;

 	struct razor_property *properties, *r;

 	uint32_t *u, *end;

 	char *pool;

 	array_init(&unsatisfied);

 	razor_set_validate(set, &unsatisfied);

 	end = unsatisfied.data + unsatisfied.size;

 	properties = set->properties.data;

 	pool = set->string_pool.data;

 	for (u = unsatisfied.data; u < end; u++) {

 		r = properties + *u;

 		if (pool[r->version] == '\0')

 			printf("%ss not satisfied\n",

 			       &pool[r->name]);

 		else

 			printf("%s-%s not satisfied\n",

 			       &pool[r->name],

 			       &pool[r->version]);

 	}

 	array_release(&unsatisfied);

 }

 #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

 add_package(struct razor_merger *merger,

 	    struct razor_package *package, struct source *source,

 	    uint32_t flags)

 {

 	char *pool;

 	struct list *r;

 	struct razor_package *p;

 	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->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);

 	}

 }

 /* Build the new package list sorted by merging the two package lists.

  * Build new string pool as we go. */

 static void

 merge_packages(struct razor_merger *merger, struct array *packages)

 {

 	struct razor_package *upstream_packages, *p, *s, *send;

 	struct source *source1, *source2;

 	char *spool, *upool;

 	uint32_t *u, *uend;

 	int cmp;

 	source1 = &merger->source1;

 	source2 = &merger->source2;

 	upstream_packages = source2->set->packages.data;

 	u = packages->data;

 	uend = packages->data + packages->size;

 	upool = source2->set->string_pool.data;

 	s = source1->set->packages.data;

 	send = source1->set->packages.data + source1->set->packages.size;

 	spool = source1->set->string_pool.data;

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

 		p = upstream_packages + *u;

 		if (s < send && u < uend)

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

 		else if (s < send)

 			cmp = -1;

 		else

 			cmp = 1;

 		if (cmp < 0) {

 			add_package(merger, s, source1, 0);

 			s++;

 		} else if (cmp == 0) {

 			add_package(merger, p, source2, UPSTREAM_SOURCE);

 			s++;

 			u++;

 		} else {

 			add_package(merger, p, source2, UPSTREAM_SOURCE);

 			u++;

 		}

 	}

 }

 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;

 }

 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 *root1, *root2;

 	struct merge_directory md;

 	uint32_t *map1, *map2;

 	map1 = merger->source1.file_map;

 	map2 = merger->source2.file_map;

 	root1 = (struct razor_entry *) merger->source1.set->files.data;

 	root2 = (struct razor_entry *) merger->source2.set->files.data;

 	/* FIXME. Blah */

 	fix_file_map(map1, root1, root1);

 	fix_file_map(map2, root2, root2);

 	md.merged = add_file(merger, "");

 	md.dir1 = root1->start;

 	md.dir2 = root2->start;

 	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);

 }

 struct razor_set *

 razor_merger_finish(struct razor_merger *merger)

 {

 	struct razor_set *result;

 	result = merger->set;

 	hashtable_release(&merger->table);

 	free(merger);

 	return result;

 }

 /* Add packages from 'upstream' to 'set'.  The packages to add are

  * specified by the 'packages' array, which is a sorted list of

  * package indexes.  Returns a newly allocated package set.  Does not

  * enforce validity of the resulting package set.

  *

  * This looks more complicated than it is.  An easy way to merge two

  * package sets would be to just use a razor_importer, but that

  * requires resorting, and is thus O(n log n).  We can do this in a

  * linear sweep, but it gets a little more complicated.

  */

 struct razor_set *

 razor_set_add(struct razor_set *set, struct razor_set *upstream,

 	      struct array *packages)

 {

 	struct razor_merger *merger;

 	struct razor_package *p, *pend;

 	merger = razor_merger_create(set, upstream);

 	merge_packages(merger, packages);

 	/* 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);

 	return razor_merger_finish(merger);

 }

 void

 razor_set_satisfy(struct razor_set *set, struct array *unsatisfied,

 		  struct razor_set *upstream, struct array *list)

 {

 	struct razor_property *requires, *r;

 	struct razor_property *p, *pend;

 	uint32_t *u, *end, *pkg;

 	struct array *package_pool;

 	char *pool, *upool;

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

 	requires = set->properties.data;

 	pool = set->string_pool.data;

 	p = upstream->properties.data;

 	pend = upstream->properties.data + upstream->properties.size;

 	upool = upstream->string_pool.data;

 	package_pool = &upstream->package_pool;

 	for (u = unsatisfied->data; u < end; u++) {

 		r = requires + *u;

 		while (p < pend &&

 		       p->type != RAZOR_PROPERTY_PROVIDES &&

 		       strcmp(&pool[r->name], &upool[p->name]) > 0)

 			p++;

 		/* If there is more than one version of a provides,

 		 * seek to the end for the highest version. */

 		while (p + 1 < pend && p->name == (p + 1)->name && p->type == (p + 1)->type)

 			p++;

 		if (p == pend ||

 		    strcmp(&pool[r->name], &upool[p->name]) != 0 ||

 		    versioncmp(&pool[r->version], &upool[p->version]) > 0) {

 			/* Do we need to track unsatisfiable requires

 			 * as we go, or should we just do a

 			 * razor_set_validate() at the end? */

 		} else {

 			pkg = array_add(list, sizeof *pkg);

 			/* We just pull in the first package that provides */

 			*pkg = list_first(&p->packages, package_pool)->data;

 		}

 	}	

 }

 static void

 find_packages(struct razor_set *set,

 	      int count, const char **package_names, struct array *list)

 {

 	struct razor_package_iterator *pi;

 	struct razor_package *p, *packages;

 	const char *name, *version;

 	uint32_t *r;

 	int i;

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

 	pi = razor_package_iterator_create(set);

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

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

 			if (strcmp(name, package_names[i]) == 0) {

 				r = array_add(list, sizeof *r);

 				*r = p - packages;

 				break;

 			}

 		}

 	}

 	razor_package_iterator_destroy(pi);

 }

 static void

 find_all_packages(struct razor_set *set,

 		  struct razor_set *upstream, struct array *list)

 {

 	struct razor_package *p, *u, *pend, *uend;

 	uint32_t *r;

 	char *pool, *upool;

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

 	pool = set->string_pool.data;

 	u = upstream->packages.data;

 	uend = upstream->packages.data + upstream->packages.size;

 	upool = upstream->string_pool.data;

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

 		while (u < uend && strcmp(&pool[p->name], &upool[u->name]) > 0)

 			u++;

 		if (strcmp(&pool[p->name], &upool[u->name]) == 0) {

 			r = array_add(list, sizeof *r);

 			*r = u - (struct razor_package *) upstream->packages.data;

 		}

 	}

 }

 struct razor_set *

 razor_set_update(struct razor_set *set, struct razor_set *upstream,

 		 int count, const char **packages)

 {

 	struct razor_set *new;

 	struct array list, unsatisfied;

 	array_init(&list);

 	if (count > 0)

 		find_packages(upstream, count, packages, &list);

 	else

 		find_all_packages(set, upstream, &list);

 	while (list.size > 0) {

 		new = razor_set_add(set, upstream, &list);

 		array_release(&list);

 		razor_set_destroy(set);

 		set = new;

 		array_init(&unsatisfied);

 		razor_set_validate(new, &unsatisfied);

 		array_init(&list);

 		razor_set_satisfy(new, &unsatisfied, upstream, &list);

 		array_release(&unsatisfied);

 	}

 	array_release(&list);

 	return set;

 }

 /* 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;

 	int res;

 	pi1 = razor_package_iterator_create(set);

 	pi2 = razor_package_iterator_create(upstream);

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

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

 	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, data);

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

 			callback(name2, NULL, version2, data);

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

 			razor_package_iterator_next(pi1, &p1,

 						    &name1, &version1);

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

 			razor_package_iterator_next(pi2, &p2,

 						    &name2, &version2);

 	}

 	razor_package_iterator_destroy(pi1);

 	razor_package_iterator_destroy(pi2);

 }