Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 337 insertions, 0 deletions

diff --git a/src/util/binhash.c b/src/util/binhash.c
new file mode 100644
index 0000000..ef8900d
--- /dev/null
+++ b/src/util/binhash.c
@@ -0,0 +1,337 @@
+/*++
+/* NAME
+/*	binhash 3
+/* SUMMARY
+/*	hash table manager
+/* SYNOPSIS
+/*	#include <binhash.h>
+/*
+/*	typedef	struct {
+/* .in +4
+/*		void	*key;
+/*		ssize_t	key_len;
+/*		void	*value;
+/*		/* private fields... */
+/* .in -4
+/*	} BINHASH_INFO;
+/*
+/*	BINHASH	*binhash_create(size)
+/*	ssize_t	size;
+/*
+/*	BINHASH_INFO *binhash_enter(table, key, key_len, value)
+/*	BINHASH	*table;
+/*	const void *key;
+/*	ssize_t	key_len;
+/*	void	*value;
+/*
+/*	char	*binhash_find(table, key, key_len)
+/*	BINHASH	*table;
+/*	const void *key;
+/*	ssize_t	key_len;
+/*
+/*	BINHASH_INFO *binhash_locate(table, key, key_len)
+/*	BINHASH	*table;
+/*	const void *key;
+/*	ssize_t	key_len;
+/*
+/*	void	binhash_delete(table, key, key_len, free_fn)
+/*	BINHASH	*table;
+/*	const void *key;
+/*	ssize_t	key_len;
+/*	void	(*free_fn)(void *);
+/*
+/*	void	binhash_free(table, free_fn)
+/*	BINHASH	*table;
+/*	void	(*free_fn)(void *);
+/*
+/*	void	binhash_walk(table, action, ptr)
+/*	BINHASH	*table;
+/*	void	(*action)(BINHASH_INFO *info, void *ptr);
+/*	void	*ptr;
+/*
+/*	BINHASH_INFO **binhash_list(table)
+/*	BINHASH	*table;
+/* DESCRIPTION
+/*	This module maintains one or more hash tables. Each table entry
+/*	consists of a unique binary-valued lookup key and a generic
+/*	character-pointer value.
+/*	The tables are automatically resized when they fill up. When the
+/*	values to be remembered are not character pointers, proper casts
+/*	should be used or the code will not be portable.
+/*
+/*	binhash_create() creates a table of the specified size and returns a
+/*	pointer to the result. The lookup keys are saved with mymemdup().
+/*
+/*	binhash_enter() stores a (key, value) pair into the specified table
+/*	and returns a pointer to the resulting entry. The code does not
+/*	check if an entry with that key already exists: use binhash_locate()
+/*	for updating an existing entry. The key is copied; the value is not.
+/*
+/*	binhash_find() returns the value that was stored under the given key,
+/*	or a null pointer if it was not found. In order to distinguish
+/*	a null value from a non-existent value, use binhash_locate().
+/*
+/*	binhash_locate() returns a pointer to the entry that was stored
+/*	for the given key, or a null pointer if it was not found.
+/*
+/*	binhash_delete() removes one entry that was stored under the given key.
+/*	If the free_fn argument is not a null pointer, the corresponding
+/*	function is called with as argument the value that was stored under
+/*	the key.
+/*
+/*	binhash_free() destroys a hash table, including contents. If the free_fn
+/*	argument is not a null pointer, the corresponding function is called
+/*	for each table entry, with as argument the value that was stored
+/*	with the entry.
+/*
+/*	binhash_walk() invokes the action function for each table entry, with
+/*	a pointer to the entry as its argument. The ptr argument is passed
+/*	on to the action function.
+/*
+/*	binhash_list() returns a null-terminated list of pointers to
+/*	all elements in the named table. The list should be passed to
+/*	myfree().
+/* RESTRICTIONS
+/*	A callback function should not modify the hash table that is
+/*	specified to its caller.
+/* DIAGNOSTICS
+/*	The following conditions are reported and cause the program to
+/*	terminate immediately: memory allocation failure; an attempt
+/*	to delete a non-existent entry.
+/* SEE ALSO
+/*	mymalloc(3) memory management wrapper
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* C library */
+
+#include <sys_defs.h>
+#include <string.h>
+
+/* Local stuff */
+
+#include "mymalloc.h"
+#include "msg.h"
+#include "binhash.h"
+
+/* binhash_hash - hash a string */
+
+static size_t binhash_hash(const void *key, ssize_t len, size_t size)
+{
+    size_t  h = 0;
+    size_t  g;
+
+    /*
+     * From the "Dragon" book by Aho, Sethi and Ullman.
+     */
+
+    while (len-- > 0) {
+	h = (h << 4U) + *(unsigned const char *) key++;
+	if ((g = (h & 0xf0000000)) != 0) {
+	    h ^= (g >> 24U);
+	    h ^= g;
+	}
+    }
+    return (h % size);
+}
+
+/* binhash_link - insert element into table */
+
+#define binhash_link(table, elm) { \
+    BINHASH_INFO **_h = table->data + binhash_hash(elm->key, elm->key_len, table->size);\
+    elm->prev = 0; \
+    if ((elm->next = *_h) != 0) \
+	(*_h)->prev = elm; \
+    *_h = elm; \
+    table->used++; \
+}
+
+/* binhash_size - allocate and initialize hash table */
+
+static void binhash_size(BINHASH *table, size_t size)
+{
+    BINHASH_INFO **h;
+
+    size |= 1;
+
+    table->data = h = (BINHASH_INFO **) mymalloc(size * sizeof(BINHASH_INFO *));
+    table->size = size;
+    table->used = 0;
+
+    while (size-- > 0)
+	*h++ = 0;
+}
+
+/* binhash_create - create initial hash table */
+
+BINHASH *binhash_create(ssize_t size)
+{
+    BINHASH *table;
+
+    table = (BINHASH *) mymalloc(sizeof(BINHASH));
+    binhash_size(table, size < 13 ? 13 : size);
+    return (table);
+}
+
+/* binhash_grow - extend existing table */
+
+static void binhash_grow(BINHASH *table)
+{
+    BINHASH_INFO *ht;
+    BINHASH_INFO *next;
+    ssize_t old_size = table->size;
+    BINHASH_INFO **h = table->data;
+    BINHASH_INFO **old_entries = h;
+
+    binhash_size(table, 2 * old_size);
+
+    while (old_size-- > 0) {
+	for (ht = *h++; ht; ht = next) {
+	    next = ht->next;
+	    binhash_link(table, ht);
+	}
+    }
+    myfree((void *) old_entries);
+}
+
+/* binhash_enter - enter (key, value) pair */
+
+BINHASH_INFO *binhash_enter(BINHASH *table, const void *key, ssize_t key_len, void *value)
+{
+    BINHASH_INFO *ht;
+
+    if (table->used >= table->size)
+	binhash_grow(table);
+    ht = (BINHASH_INFO *) mymalloc(sizeof(BINHASH_INFO));
+    ht->key = mymemdup(key, key_len);
+    ht->key_len = key_len;
+    ht->value = value;
+    binhash_link(table, ht);
+    return (ht);
+}
+
+/* binhash_find - lookup value */
+
+void   *binhash_find(BINHASH *table, const void *key, ssize_t key_len)
+{
+    BINHASH_INFO *ht;
+
+#define	KEY_EQ(x,y,l) (((unsigned char *) x)[0] == ((unsigned char *) y)[0] && memcmp(x,y,l) == 0)
+
+    if (table != 0)
+	for (ht = table->data[binhash_hash(key, key_len, table->size)]; ht; ht = ht->next)
+	    if (key_len == ht->key_len && KEY_EQ(key, ht->key, key_len))
+		return (ht->value);
+    return (0);
+}
+
+/* binhash_locate - lookup entry */
+
+BINHASH_INFO *binhash_locate(BINHASH *table, const void *key, ssize_t key_len)
+{
+    BINHASH_INFO *ht;
+
+    if (table != 0)
+	for (ht = table->data[binhash_hash(key, key_len, table->size)]; ht; ht = ht->next)
+	    if (key_len == ht->key_len && KEY_EQ(key, ht->key, key_len))
+		return (ht);
+    return (0);
+}
+
+/* binhash_delete - delete one entry */
+
+void    binhash_delete(BINHASH *table, const void *key, ssize_t key_len, void (*free_fn) (void *))
+{
+    if (table != 0) {
+	BINHASH_INFO *ht;
+	BINHASH_INFO **h = table->data + binhash_hash(key, key_len, table->size);
+
+	for (ht = *h; ht; ht = ht->next) {
+	    if (key_len == ht->key_len && KEY_EQ(key, ht->key, key_len)) {
+		if (ht->next)
+		    ht->next->prev = ht->prev;
+		if (ht->prev)
+		    ht->prev->next = ht->next;
+		else
+		    *h = ht->next;
+		table->used--;
+		myfree(ht->key);
+		if (free_fn)
+		    (*free_fn) (ht->value);
+		myfree((void *) ht);
+		return;
+	    }
+	}
+	msg_panic("binhash_delete: unknown_key: \"%s\"", (char *) key);
+    }
+}
+
+/* binhash_free - destroy hash table */
+
+void    binhash_free(BINHASH *table, void (*free_fn) (void *))
+{
+    if (table != 0) {
+	ssize_t i = table->size;
+	BINHASH_INFO *ht;
+	BINHASH_INFO *next;
+	BINHASH_INFO **h = table->data;
+
+	while (i-- > 0) {
+	    for (ht = *h++; ht; ht = next) {
+		next = ht->next;
+		myfree(ht->key);
+		if (free_fn)
+		    (*free_fn) (ht->value);
+		myfree((void *) ht);
+	    }
+	}
+	myfree((void *) table->data);
+	table->data = 0;
+	myfree((void *) table);
+    }
+}
+
+/* binhash_walk - iterate over hash table */
+
+void    binhash_walk(BINHASH *table, void (*action) (BINHASH_INFO *, void *),
+		             void *ptr) {
+    if (table != 0) {
+	ssize_t i = table->size;
+	BINHASH_INFO **h = table->data;
+	BINHASH_INFO *ht;
+
+	while (i-- > 0)
+	    for (ht = *h++; ht; ht = ht->next)
+		(*action) (ht, ptr);
+    }
+}
+
+/* binhash_list - list all table members */
+
+BINHASH_INFO **binhash_list(table)
+BINHASH *table;
+{
+    BINHASH_INFO **list;
+    BINHASH_INFO *member;
+    ssize_t count = 0;
+    ssize_t i;
+
+    if (table != 0) {
+	list = (BINHASH_INFO **) mymalloc(sizeof(*list) * (table->used + 1));
+	for (i = 0; i < table->size; i++)
+	    for (member = table->data[i]; member != 0; member = member->next)
+		list[count++] = member;
+    } else {
+	list = (BINHASH_INFO **) mymalloc(sizeof(*list));
+    }
+    list[count] = 0;
+    return (list);
+}