#define _GNU_SOURCE

 #include <stdlib.h>

 #include <stddef.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 "razor.h"

 struct array {

 	void *data;

 	int size, alloc;

 };

 struct razor_set_section {

 	unsigned int type;

 	unsigned int offset;

 	unsigned int size;

 };

 struct razor_set_header {

 	unsigned int magic;

 	unsigned int version;

 	struct razor_set_section sections[0];

 };

 #define RAZOR_MAGIC 0x7a7a7a7a

 #define RAZOR_VERSION 1

 #define RAZOR_PACKAGES 0

 #define RAZOR_REQUIRES 1

 #define RAZOR_PROVIDES 2

 #define RAZOR_STRING_POOL 3

 #define RAZOR_PACKAGE_POOL 4

 #define RAZOR_REQUIRES_POOL 5

 #define RAZOR_PROVIDES_POOL 6

 struct razor_package {

 	unsigned long name;

 	unsigned long version;

 	unsigned long requires;

 	unsigned long provides;

 };

 struct razor_property {

 	unsigned long name;

 	unsigned long version;

 	unsigned long packages;

 };

 struct razor_set {

 	struct array string_pool;

  	struct array packages;

 	struct array package_pool;

  	struct array requires;

  	struct array provides;

  	struct array requires_pool;

  	struct array provides_pool;

 	struct razor_set_header *header;

 };

 struct import_property_context {

 	struct array *all;

 	struct array package;

 };

 struct razor_importer {

 	struct razor_set *set;

 	struct array buckets;

 	struct import_property_context requires;

 	struct import_property_context provides;

 	struct razor_package *package;

 };

 static void

 array_init(struct array *array)

 {

 	memset(array, 0, sizeof *array);

 }

 static void

 array_release(struct array *array)

 {

 	free(array->data);

 }

 static void *

 array_add(struct array *array, int size)

 {

 	int alloc;

 	void *data, *p;

 	if (array->alloc > 0)

 		alloc = array->alloc;

 	else

 		alloc = 16;

 	while (alloc < array->size + size)

 		alloc *= 2;

 	if (array->alloc < alloc) {

 		data = realloc(array->data, alloc);

 		if (data == NULL)

 			return 0;

 		array->data = data;

 		array->alloc = alloc;

 	}

 	p = array->data + array->size;

 	array->size += size;

 	return p;

 }

 static int

 write_to_fd(int fd, void *p, size_t size)

 {

 	int rest, len;

 	rest = size;

 	while (rest > 0) {

 		len = write(fd, p, rest);

 		if (len < 0)

 			return -1;

 		rest -= len;

 	}

 	return 0;

 }

 static void *

 zalloc(size_t size)

 {

 	void *p;

 	p = malloc(size);

 	memset(p, 0, size);

 	return p;

 }

 struct razor_set_section razor_sections[] = {

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

 	{ RAZOR_REQUIRES,	offsetof(struct razor_set, requires) },

 	{ RAZOR_PROVIDES,	offsetof(struct razor_set, provides) },

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

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

 	{ RAZOR_REQUIRES_POOL,	offsetof(struct razor_set, requires_pool) },

 	{ RAZOR_PROVIDES_POOL,	offsetof(struct razor_set, provides_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;

 	unsigned long 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 += (a->size + 4095) & ~4095;

 	}

 	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;

 	write_to_fd(fd, data, 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;

 		write_to_fd(fd, a->data, (a->size + 4095) & ~4095);

 	}

 	close(fd);

 	return 0;

 }

 static unsigned int

 hash_string(const char *key)

 {

 	const char *p;

 	unsigned int hash = 0;

 	for (p = key; *p; p++)

 		hash = (hash * 617) ^ *p;

 	return hash;

 }

 static unsigned long

 razor_importer_lookup(struct razor_importer *importer, const char *key)

 {

 	unsigned int mask, start, i;

 	unsigned long *b;

 	char *pool;

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

 	mask = importer->buckets.alloc - 1;

 	start = hash_string(key) * sizeof(unsigned long);

 	for (i = 0; i < importer->buckets.alloc; i += sizeof *b) {

 		b = importer->buckets.data + ((start + i) & mask);

 		if (*b == 0)

 			return 0;

 		if (strcmp(key, &pool[*b]) == 0)

 			return *b;

 	}

 	return 0;

 }

 static unsigned long

 add_to_string_pool(struct razor_set *set, const char *key)

 {

 	int len;

 	char *p;

 	len = strlen(key) + 1;

 	p = array_add(&set->string_pool, len);

 	memcpy(p, key, len);

 	return p - (char *) set->string_pool.data;

 }

 static unsigned long

 add_to_property_pool(struct array *pool, struct array *properties)

 {

 	unsigned long  *p;

 	p = array_add(properties, sizeof *p);

 	*p = ~0ul;

 	p = array_add(pool, properties->size);

 	memcpy(p, properties->data, properties->size);

 	return p - (unsigned long *) pool->data;

 }

 static void

 do_insert(struct razor_importer *importer, unsigned long value)

 {

 	unsigned int mask, start, i;

 	unsigned long *b;

 	const char *key;

 	key = (char *) importer->set->string_pool.data + value;

 	mask = importer->buckets.alloc - 1;

 	start = hash_string(key) * sizeof(unsigned long);

 	for (i = 0; i < importer->buckets.alloc; i += sizeof *b) {

 		b = importer->buckets.data + ((start + i) & mask);

 		if (*b == 0) {

 			*b = value;

 			break;

 		}

 	}

 }

 static unsigned long

 razor_importer_insert(struct razor_importer *importer, const char *key)

 {

 	unsigned long value, *buckets, *b, *end;

 	int alloc;

 	alloc = importer->buckets.alloc;

 	array_add(&importer->buckets, 4 * sizeof *buckets);

 	if (alloc != importer->buckets.alloc) {

 		end = importer->buckets.data + alloc;

 		memset(end, 0, importer->buckets.alloc - alloc);

 		for (b = importer->buckets.data; b < end; b++) {

 			value = *b;

 			if (value != 0) {

 				*b = 0;

 				do_insert(importer, value);

 			}

 		}

 	}

 	value = add_to_string_pool(importer->set, key);

 	do_insert (importer, value);

 	return value;

 }

 static unsigned long

 razor_importer_tokenize(struct razor_importer *importer, const char *string)

 {

 	unsigned long token;

 	if (string == NULL)

 		return razor_importer_tokenize(importer, "");

 	token = razor_importer_lookup(importer, string);

 	if (token != 0)

 		return token;

 	return razor_importer_insert(importer, string);

 }

 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 = razor_importer_tokenize(importer, name);

 	p->version = razor_importer_tokenize(importer, version);

 	importer->package = p;

 	array_init(&importer->requires.package);

 	array_init(&importer->provides.package);

 }

 void

 razor_importer_finish_package(struct razor_importer *importer)

 {

 	struct razor_package *p;

 	p = importer->package;

 	p->requires = add_to_property_pool(&importer->set->requires_pool,

 					   &importer->requires.package);

 	p->provides = add_to_property_pool(&importer->set->provides_pool,

 					   &importer->provides.package);

 	array_release(&importer->requires.package);

 	array_release(&importer->provides.package);

 }

 static void

 razor_importer_add_property(struct razor_importer *importer,

 			    struct import_property_context *pctx,

 			    const char *name, const char *version)

 {

 	struct razor_property *p;

 	unsigned long *r;

 	p = array_add(pctx->all, sizeof *p);

 	p->name = razor_importer_tokenize(importer, name);

 	p->version = razor_importer_tokenize(importer, version);

 	p->packages = importer->package -

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

 	r = array_add(&pctx->package, sizeof *r);

 	*r = p - (struct razor_property *) pctx->all->data;

 }

 void

 razor_importer_add_requires(struct razor_importer *importer,

 			    const char *name, const char *version)

 {

 	razor_importer_add_property(importer,

 				    &importer->requires, name, version);

 }

 void

 razor_importer_add_provides(struct razor_importer *importer,

 			    const char *name, const char *version)

 {

 	razor_importer_add_property(importer,

 				    &importer->provides, name, version);

 }

 struct razor_importer *

 razor_importer_new(void)

 {

 	struct razor_importer *importer;

 	importer = zalloc(sizeof *importer);

 	importer->set = razor_set_create();

 	importer->requires.all = &importer->set->requires;

 	importer->provides.all = &importer->set->provides;

 	return importer;

 }

 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, unsigned long *map,

 		  struct qsort_context *ctx)

 {

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

 	unsigned long *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);

 }

 unsigned long *

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

 		compare_with_data_func_t compare, void *data)

 {

 	struct qsort_context ctx;

 	unsigned long *map;

 	int i;

 	ctx.size = size;

 	ctx.compare = compare;

 	ctx.data = data;

 	map = malloc(nelem * sizeof (unsigned long));

 	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;

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

 	else

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

 }

 static unsigned long *

 uniqueify_properties(struct razor_set *set, struct array *properties)

 {

 	struct razor_property *rp, *up, *rp_end;

 	struct array *pkgs, *p;

 	unsigned long *map, *rmap, *r;

 	int i, count, unique;

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

 	map = qsort_with_data(properties->data,

 			      count,

 			      sizeof(struct razor_property),

 			      compare_properties,

 			      set);

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

 	rmap = malloc(count * sizeof *map);

 	pkgs = zalloc(count * sizeof *pkgs);

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

 		if (rp->name != up->name || rp->version != up->version) {

 			up++;

 			up->name = rp->name;

 			up->version = rp->version;

 		}

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

 		rmap[map[i]] = unique;

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

 		*r = rp->packages;

 	}

 	free(map);

 	up++;

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

 	rp_end = up;

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

 		rp->packages = add_to_property_pool(&set->package_pool, p);

 		array_release(p);

 	}

 	free(pkgs);

 	return rmap;

 }

 static void

 remap_links(struct array *links, unsigned long *map)

 {

 	unsigned long *p, *end;

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

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

 		if (*p != ~0)

 			*p = map[*p];

 }

 struct razor_set *

 razor_importer_finish(struct razor_importer *importer)

 {

 	struct razor_set *set;

 	unsigned long *map, *rmap;

 	int i, count;

 	map = uniqueify_properties(importer->set, &importer->set->requires);

 	remap_links(&importer->set->requires_pool, map);

 	free(map);

 	map = uniqueify_properties(importer->set, &importer->set->provides);

 	remap_links(&importer->set->provides_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;

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

 	free(map);

 	free(rmap);

 	set = importer->set;

 	array_release(&importer->buckets);

 	free(importer);

 	return set;

 }

 void

 razor_set_list(struct razor_set *set)

 {

 	struct razor_package *p, *end;

 	char *pool;

 	pool = set->string_pool.data;

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

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

 		printf("%s %s\n", &pool[p->name], &pool[p->version]);

 }

 struct razor_set *bsearch_set;

 static int

 compare_package_name(const void *key, const void *data)

 {

 	const struct razor_package *p = data;

 	char *pool;

 	pool = bsearch_set->string_pool.data;

 	return strcmp(key, &pool[p->name]);

 }

 struct razor_package *

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

 {

 	bsearch_set = set;

 	return bsearch(package, set->packages.data,

 		       set->packages.size / sizeof(struct razor_package),

 		       sizeof(struct razor_package), compare_package_name);

 }

 static int

 compare_property_name(const void *key, const void *data)

 {

 	const struct razor_property *p = data;

 	char *pool;

 	pool = bsearch_set->string_pool.data;

 	return strcmp(key, &pool[p->name]);

 }

 struct razor_property *

 razor_set_get_property(struct razor_set *set,

 		       struct array *properties,

 		       const char *property)

 {

 	struct razor_property *p, *start;

 	bsearch_set = set;

 	p = bsearch(property, properties->data,

 		    properties->size / sizeof(struct razor_property),

 		    sizeof(struct razor_property), compare_property_name);

 	start = properties->data;

 	while (p > start && (p - 1)->name == p->name)

 		p--;

 	return p;

 }

 static void

 razor_set_list_all_properties(struct razor_set *set, struct array *properties)

 {

 	struct razor_property *p, *end;

 	char *pool;

 	pool = set->string_pool.data;

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

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

 		printf("%s %s\n", &pool[p->name], &pool[p->version]);

 }

 void

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

 {

 	struct razor_property *p, *requires;

 	struct razor_package *package;

 	unsigned long *r;

 	char *pool;

 	if (name) {

 		package = razor_set_get_package(set, name);

 		r = (unsigned long *) set->requires_pool.data +

 			package->requires;

 		requires = set->requires.data;

 		pool = set->string_pool.data;

 		while (~*r) {

 			p = &requires[*r++];

 			printf("%s %s\n", &pool[p->name], &pool[p->version]);

 		}

 	} else

 		razor_set_list_all_properties(set, &set->requires);

 }

 void

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

 {

 	struct razor_property *p, *provides;

 	struct razor_package *package;

 	unsigned long *r;

 	char *pool;

 	if (name) {

 		package = razor_set_get_package(set, name);

 		r = (unsigned long *) set->provides_pool.data +

 			package->provides;

 		provides = set->provides.data;

 		pool = set->string_pool.data;

 		while (~*r) {

 			p = &provides[*r++];

 			printf("%s %s\n", &pool[p->name], &pool[p->version]);

 		}

 	} else 

 		razor_set_list_all_properties(set, &set->provides);

 }

 static void

 razor_set_list_property_packages(struct razor_set *set,

 				 struct array *properties,

 				 const char *name,

 				 const char *version)

 {

 	struct razor_property *property, *end;

 	struct razor_package *p, *packages;

 	unsigned long *r;

 	char *pool;

 	if (name == NULL)

 		return;

 	property = razor_set_get_property(set, properties, name);

 	packages = set->packages.data;

 	pool = set->string_pool.data;

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

 	while (property < end && strcmp(name, &pool[property->name]) == 0) {

 		if (version && versioncmp(version, &pool[property->version]) != 0)

 			goto next;

 		r = (unsigned long *)

 			set->package_pool.data + property->packages;

 		while (~*r) {

 			p = &packages[*r++];

 			printf("%s %s\n",

 			       &pool[p->name], &pool[p->version]);

 		}

 	next:

 		property++;

 	}

 }

 void

 razor_set_list_requires_packages(struct razor_set *set,

 				 const char *name,

 				 const char *version)

 {

 	razor_set_list_property_packages(set, &set->requires, name, version);

 }

 void

 razor_set_list_provides_packages(struct razor_set *set,

 				 const char *name,

 				 const char *version)

 {

 	razor_set_list_property_packages(set, &set->provides, name, version);

 }

 static void

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

 {

 	struct razor_property *r, *p, *rend, *pend;

 	unsigned long *u;

 	char *pool;

 	p = set->provides.data;

 	rend = set->requires.data + set->requires.size;

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

 	pool = set->string_pool.data;

 	for (r = set->requires.data; r < rend; r++) {

 		while (p < pend && strcmp(&pool[r->name], &pool[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++;

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

 		    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->requires.data;

 		}

 	}

 }

 void

 razor_set_list_unsatisfied(struct razor_set *set)

 {

 	struct array unsatisfied;

 	struct razor_property *requires, *r;

 	unsigned long *u, *end;

 	char *pool;

 	array_init(&unsatisfied);

 	razor_set_validate(set, &unsatisfied);

 	end = unsatisfied.data + unsatisfied.size;

 	requires = set->requires.data;

 	pool = set->string_pool.data;

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

 		r = requires + *u;

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

 		       &pool[r->name], &pool[r->version]);

 	}

 	array_release(&unsatisfied);

 }

 #define UPSTREAM_SOURCE 0x80000000ul

 #define INDEX_MASK 0x00fffffful

 struct source {

 	struct razor_set *set;

 	unsigned long *requires_map;

 	unsigned long *provides_map;

 };

 static void

 prepare_source(struct source *source, struct razor_set *set)

 {

 	int count;

 	size_t size;

 	source->set = set;

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

 	size = count * sizeof *source->requires_map;

 	source->requires_map = zalloc(size);

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

 	size = count * sizeof *source->provides_map;

 	source->provides_map = zalloc(size);

 }

 static void

 add_package(struct razor_importer *importer,

 	    struct razor_package *package, struct source *source,

 	    unsigned long flags)

 {

 	char *pool;

 	unsigned long *r;

 	struct razor_package *p;

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

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

 	p->name = razor_importer_tokenize(importer, &pool[package->name]);

 	p->name |= flags;

 	p->version = razor_importer_tokenize(importer,

 					     &pool[package->version]);

 	p->requires = package->requires;

 	p->provides = package->provides;

 	r = (unsigned long *)

 		source->set->requires_pool.data + package->requires;

 	while (*r != ~0)

 		source->requires_map[*r++] = 1;

 	r = (unsigned long *)

 		source->set->provides_pool.data + package->provides;

 	while (*r != ~0)

 		source->provides_map[*r++] = 1;

 }

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

  * Build new string pool as we go. (for now we just re-use that part of

  * the importer). */

 static void

 merge_packages(struct razor_importer *importer,

 	       struct source *source1, struct source *source2,

 	       struct array *packages)

 {

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

 	char *spool, *upool;

 	unsigned long *u, *uend;

 	int cmp;

 	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) {

 		p = upstream_packages + *u;

 		if (u < uend)

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

 		if (u >= uend || cmp < 0) {

 			add_package(importer, s, source1, 0);

 			s++;

 		} else if (cmp == 0) {

 			add_package(importer, p, source2, UPSTREAM_SOURCE);

 			s++;

 			u++;

 		} else {

 			add_package(importer, p, source2, UPSTREAM_SOURCE);

 			u++;

 		}

 	}

 }

 static unsigned long

 add_property(struct razor_importer *importer, struct array *properties,

 	     const char *name, const char *version)

 {

 	struct razor_property *p;

 	p = array_add(properties, sizeof *p);

 	p->name = razor_importer_tokenize(importer, name);

 	p->version = razor_importer_tokenize(importer, version);

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

 }

 static void

 merge_properties(struct array *properties,

 		 struct razor_importer *importer,

 		 struct razor_set *set1,

 		 struct array *properties1,

 		 unsigned long *map1,

 		 struct razor_set *set2,

 		 struct array *properties2,

 		 unsigned long *map2)

 {

 	struct razor_property *p1, *p2;

 	int i, j, cmp, count1, count2;

 	char *pool1, *pool2;

 	i = 0;

 	j = 0;

 	pool1 = set1->string_pool.data;

 	pool2 = set2->string_pool.data;

 	count1 = properties1->size / sizeof *p1;

 	count2 = properties2->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 *) properties1->data + i;

 		p2 = (struct razor_property *) properties2->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 = versioncmp(&pool1[p1->version],

 					 &pool2[p2->version]);

 		if (cmp < 0) {

 			map1[i++] = add_property(importer,

 						 properties,

 						 &pool1[p1->name],

 						 &pool1[p1->version]);

 		} else if (cmp > 0) {

 			map2[j++] = add_property(importer,

 						 properties,

 						 &pool2[p2->name],

 						 &pool2[p2->version]);

 		} else  {

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

 							     properties,

 							     &pool1[p1->name],

 							     &pool1[p1->version]);

 		}

 	}

 }

 static unsigned long

 emit_properties(struct array *source_pool, unsigned long index,

 		unsigned long *map, struct array *pool)

 {

 	unsigned long r, *p, *q;

 	r = pool->size / sizeof *q;

 	p = (unsigned long *) source_pool->data + index;

 	while (*p != ~0) {

 		q = array_add(pool, sizeof *q);

 		*q = map[*p++];

 	}

 	q = array_add(pool, sizeof *q);

 	*q = ~0;

 	return 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_package_lists(struct razor_set *set)

 {

 	int requires_count, provides_count;

 	struct array *requires_pkgs, *provides_pkgs, *a;

 	struct razor_package *pkg, *pkg_end;

 	struct razor_property *prop, *prop_end;

 	unsigned long *r, *q, *rpool, *ppool;

 	requires_count = set->requires.size / sizeof (struct razor_property);

 	provides_count = set->provides.size / sizeof (struct razor_property);

 	requires_pkgs = zalloc(requires_count * sizeof *requires_pkgs);

 	provides_pkgs = zalloc(provides_count * sizeof *provides_pkgs);

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

 	rpool = set->requires_pool.data;

 	ppool = set->provides_pool.data;

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

 		for (r = &rpool[pkg->requires]; *r != ~0; r++) {

 			q = array_add(&requires_pkgs[*r], sizeof *q);

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

 		}

 		for (r = &ppool[pkg->provides]; *r != ~0; r++) {

 			q = array_add(&provides_pkgs[*r], sizeof *q);

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

 		}

 	}

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

 	a = requires_pkgs;

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

 		prop->packages = add_to_property_pool(&set->requires_pool, a);

 		array_release(a);

 	}

 	free(requires_pkgs);

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

 	a = provides_pkgs;

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

 		prop->packages = add_to_property_pool(&set->provides_pool, a);

 		array_release(a);

 	}

 	free(provides_pkgs);

 }

 /* 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_set *result;

 	struct razor_importer *importer;

 	struct razor_package *p, *pend;

 	struct source source, upstream_source;

 	importer = razor_importer_new();

 	prepare_source(&upstream_source, upstream);

 	prepare_source(&source, set);

 	merge_packages(importer, &source, &upstream_source, 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(&importer->set->requires, importer,

 			 set, &set->requires, source.requires_map,

 			 upstream, &upstream->requires,

 			 upstream_source.requires_map);

 	merge_properties(&importer->set->provides, importer,

 			 set, &set->provides, source.provides_map,

 			 upstream, &upstream->provides,

 			 upstream_source.provides_map);

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

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

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

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

 		struct source *src;

 		if (p->name & UPSTREAM_SOURCE)

 			src = &upstream_source;

 		else

 			src = &source;

 		p->requires = emit_properties(&src->set->requires_pool,

 					      p->requires,

 					      src->requires_map,

 					      &importer->set->requires_pool);

 		p->provides = emit_properties(&src->set->provides_pool,

 					      p->provides,

 					      src->provides_map,

 					      &importer->set->provides_pool);

 		p->name &= INDEX_MASK;

 	}

 	rebuild_package_lists(importer->set);

 	result = importer->set;

 	array_release(&importer->buckets);

 	free(importer);

 	return result;

 }

 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;

 	unsigned long *u, *end, *pkg, *package_pool;

 	char *pool, *upool;

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

 	requires = set->requires.data;

 	pool = set->string_pool.data;

 	p = upstream->provides.data;

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

 	upool = upstream->string_pool.data;

 	package_pool = upstream->package_pool.data;

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

 		r = requires + *u;

 		while (p < pend && 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++;

 		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 = package_pool[p->packages];

 		}

 	}	

 }

 static void

 find_packages(struct razor_set *set,

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

 {

 	struct razor_package *p;

 	unsigned long *r;

 	int i;

 	/* FIXME: Sort the packages. */

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

 		p = razor_set_get_package(set, packages[i]);

 		r = array_add(list, sizeof *r);

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

 	}

 }

 static void

 find_all_packages(struct razor_set *set,

 		  struct razor_set *upstream, struct array *list)

 {

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

 	unsigned long *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 razor_package *upackages;

 	struct array list, unsatisfied;

 	char *pool;

 	unsigned long *u, *end;

 	int total = 0;

 	array_init(&list);

 	if (count > 0)

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

 	else

 		find_all_packages(set, upstream, &list);

 	end = list.data + list.size;

 	upackages = upstream->packages.data;

 	pool = upstream->string_pool.data;

 	total += list.size / sizeof *u;

 	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);

 		end = list.data + list.size;

 		upackages = upstream->packages.data;

 		pool = upstream->string_pool.data;

 		total += list.size / sizeof *u;

 	}

 	array_release(&list);

 	return set;

 }