server/atom.c - wine - Git at Google

 /*
  * Server-side atom management
  *
  * Copyright (C) 1999, 2000 Alexandre Julliard
  * Copyright (C) 2000 Turchanov Sergei
  */

 #include <assert.h>
 #include <stdlib.h>
 #include <stdio.h>

 #include "unicode.h"
 #include "request.h"
 #include "object.h"
 #include "process.h"

 #define HASH_SIZE     37
 #define MIN_HASH_SIZE 4
 #define MAX_HASH_SIZE 0x200

 #define MAX_ATOM_LEN  255
 #define MAX_ATOMS     0x4000

 struct atom_entry
 {
     struct atom_entry *next;   /* hash table list */
     struct atom_entry *prev;   /* hash table list */
     int                atom;   /* atom handle */
     int                count;  /* reference count */
     int                hash;   /* string hash */
     WCHAR              str[1]; /* atom string */
 };

 struct atom_table
 {
     struct object       obj;                 /* object header */
     int                 count;               /* count of atom handles */
     int                 last;                /* last handle in-use */
     struct atom_entry **handles;             /* atom handles */
     int                 entries_count;       /* humber of hash entries */
     struct atom_entry **entries;             /* hash table entries */
 };

 static void atom_table_dump( struct object *obj, int verbose );
 static void atom_table_destroy( struct object *obj );

 static const struct object_ops atom_table_ops =
 {
     sizeof(struct atom_table),    /* size */
     atom_table_dump,              /* dump */
     no_add_queue,                 /* add_queue */
     NULL,                         /* remove_queue */
     NULL,                         /* signaled */
     NULL,                         /* satified */
     NULL,                         /* get_poll_events */
     NULL,                         /* poll_event */
     no_read_fd,                   /* get_read_fd */
     no_write_fd,                  /* get_write_fd */
     no_flush,                     /* flush */
     no_get_file_info,             /* get_file_info */
     atom_table_destroy            /* destroy */
 };

 static struct atom_table *global_table;


 /* copy an atom name to a temporary area */
 static const WCHAR *copy_name( const WCHAR *str )
 {
     static WCHAR buffer[MAX_ATOM_LEN+1];
     WCHAR *p = buffer;

     while (p < buffer + sizeof(buffer) - 1) if (!(*p++ = *str++)) break;
     *p = 0;
     return buffer;
 }

 /* create an atom table */
 static struct atom_table *create_table(int entries_count)
 {
     struct atom_table *table;

     if ((table = alloc_object( &atom_table_ops, -1 )))
     {
         if ((entries_count < MIN_HASH_SIZE) ||
             (entries_count > MAX_HASH_SIZE)) entries_count = HASH_SIZE;
         table->entries_count = entries_count;
         if (!(table->entries = malloc( sizeof(*table->entries) * table->entries_count )))
         {
             set_error( STATUS_NO_MEMORY );
             goto fail;
         }
         memset( table->entries, 0, sizeof(*table->entries) * table->entries_count );
         table->count = 64;
         table->last  = -1;
         if ((table->handles = mem_alloc( sizeof(*table->handles) * table->count )))
             return table;
 fail:
         release_object( table );
         table = NULL;
     }
     return table;
 }

 /* retrieve an entry pointer from its atom */
 static struct atom_entry *get_atom_entry( struct atom_table *table, int atom )
 {
     struct atom_entry *entry = NULL;
     if (table && (atom >= 0) && (atom <= table->last)) entry = table->handles[atom];
     if (!entry) set_error( STATUS_INVALID_HANDLE );
     return entry;
 }

 /* add an atom entry in the table and return its handle */
 static int add_atom_entry( struct atom_table *table, struct atom_entry *entry )
 {
     int i;
     for (i = 0; i <= table->last; i++)
         if (!table->handles[i]) goto found;
     if (i == table->count)
     {
         struct atom_entry **new_table = NULL;
         int new_size = table->count + table->count / 2;
         if (new_size > MAX_ATOMS) new_size = MAX_ATOMS;
         if (new_size > table->count)
             new_table = realloc( table->handles, sizeof(*table->handles) * new_size );
         if (!new_table)
         {
             set_error( STATUS_NO_MEMORY );
             return -1;
         }
         table->count = new_size;
         table->handles = new_table;
     }
     table->last = i;
  found:
     table->handles[i] = entry;
     entry->atom = i;
     return i;
 }

 /* compute the hash code for a string */
 static int atom_hash( struct atom_table *table, const WCHAR *str )
 {
     int i;
     WCHAR hash = 0;
     for (i = 0; str[i]; i++) hash ^= towupper(str[i]) + i;
     return hash % table->entries_count;
 }

 /* dump an atom table */
 static void atom_table_dump( struct object *obj, int verbose )
 {
     int i;
     struct atom_table *table = (struct atom_table *)obj;
     assert( obj->ops == &atom_table_ops );

     fprintf( stderr, "Atom table size=%d entries=%d\n",
              table->last + 1, table->entries_count );
     if (!verbose) return;
     for (i = 0; i <= table->last; i++)
     {
         struct atom_entry *entry = table->handles[i];
         if (!entry) continue;
         fprintf( stderr, "  %5d: ref=%d hash=%d \"", i, entry->count, entry->hash );
         dump_strW( entry->str, strlenW(entry->str), stderr, "\"\"");
         fprintf( stderr, "\"\n" );
     }
 }

 /* destroy the atom table */
 static void atom_table_destroy( struct object *obj )
 {
     int i;
     struct atom_table *table = (struct atom_table *)obj;
     assert( obj->ops == &atom_table_ops );
     if (table->handles)
     {
         for (i = 0; i <= table->last; i++) free( table->handles[i] );
         free( table->handles );
     }
     if (table->entries) free( table->entries );
 }

 /* find an atom entry in its hash list */
 static struct atom_entry *find_atom_entry( struct atom_table *table, const WCHAR *str, int hash )
 {
     struct atom_entry *entry = table->entries[hash];
     while (entry)
     {
         if (!strcmpiW( entry->str, str )) break;
         entry = entry->next;
     }
     return entry;
 }

 /* close the atom table; used on server exit */
 void close_atom_table(void)
 {
     if (global_table) release_object( global_table );
 }

 /* add an atom to the table */
 static int add_atom( struct atom_table *table, const WCHAR *str )
 {
     struct atom_entry *entry;
     int hash = atom_hash( table, str );
     int atom = -1;

     if (!*str)
     {
         set_error( STATUS_OBJECT_NAME_INVALID );
         return -1;
     }
     if ((entry = find_atom_entry( table, str, hash )))  /* exists already */
     {
         entry->count++;
         return entry->atom;
     }

     if ((entry = mem_alloc( sizeof(*entry) + strlenW(str) * sizeof(WCHAR) )))
     {
         if ((atom = add_atom_entry( table, entry )) != -1)
         {
             entry->prev  = NULL;
             if ((entry->next = table->entries[hash])) entry->next->prev = entry;
             table->entries[hash] = entry;
             entry->count = 1;
             entry->hash  = hash;
             strcpyW( entry->str, str );
         }
         else free( entry );
     }
     else set_error( STATUS_NO_MEMORY );
     return atom;
 }

 /* delete an atom from the table */
 static void delete_atom( struct atom_table *table, int atom )
 {
     struct atom_entry *entry = get_atom_entry( table, atom );
     if (entry && !--entry->count)
     {
         if (entry->next) entry->next->prev = entry->prev;
         if (entry->prev) entry->prev->next = entry->next;
         else table->entries[entry->hash] = entry->next;
         table->handles[atom] = NULL;
         free( entry );
     }
 }

 /* find an atom in the table */
 static int find_atom( struct atom_table *table, const WCHAR *str )
 {
     struct atom_entry *entry;

     if (table && ((entry = find_atom_entry( table, str, atom_hash(table, str) )))) return entry->atom;
     if (!*str) set_error( STATUS_OBJECT_NAME_INVALID );
     else set_error( STATUS_OBJECT_NAME_NOT_FOUND );
     return -1;
 }

 /* get an atom name and refcount*/
 static int get_atom_name( struct atom_table *table, int atom, WCHAR *str )
 {
     int count = -1;
     struct atom_entry *entry = get_atom_entry( table, atom );
     if (entry)
     {
         strcpyW( str, entry->str );
         count = entry->count;
     }
     return count;
 }

 /* add a global atom */
 DECL_HANDLER(add_atom)
 {
     struct atom_table **table_ptr = req->local ? &current->process->atom_table : &global_table;

     if (!*table_ptr) *table_ptr = create_table(0);
     if (*table_ptr) req->atom = add_atom( *table_ptr, copy_name( req->name ) );
 }

 /* delete a global atom */
 DECL_HANDLER(delete_atom)
 {
     delete_atom( req->local ? current->process->atom_table : global_table,
                  req->atom );
 }

 /* find a global atom */
 DECL_HANDLER(find_atom)
 {
     req->atom = find_atom( req->local ? current->process->atom_table : global_table,
                            copy_name( req->name ) );
 }

 /* get global atom name */
 DECL_HANDLER(get_atom_name)
 {
     req->name[0] = 0;
     req->count = get_atom_name( req->local ? current->process->atom_table : global_table,
                                 req->atom, req->name );
 }

 /* init the process atom table */
 DECL_HANDLER(init_atom_table)
 {
     if (!current->process->atom_table)
         current->process->atom_table = create_table( req->entries );
 }
	/*
	* Server-side atom management
	*
	* Copyright (C) 1999, 2000 Alexandre Julliard
	* Copyright (C) 2000 Turchanov Sergei
	*/

	#include <assert.h>
	#include <stdlib.h>
	#include <stdio.h>

	#include "unicode.h"
	#include "request.h"
	#include "object.h"
	#include "process.h"

	#define HASH_SIZE 37
	#define MIN_HASH_SIZE 4
	#define MAX_HASH_SIZE 0x200

	#define MAX_ATOM_LEN 255
	#define MAX_ATOMS 0x4000

	struct atom_entry
	{
	struct atom_entry next; / hash table list */
	struct atom_entry prev; / hash table list */
	int atom; /* atom handle */
	int count; /* reference count */
	int hash; /* string hash */
	WCHAR str[1]; /* atom string */
	};

	struct atom_table
	{
	struct object obj; /* object header */
	int count; /* count of atom handles */
	int last; /* last handle in-use */
	struct atom_entry *handles; / atom handles */
	int entries_count; /* humber of hash entries */
	struct atom_entry *entries; / hash table entries */
	};

	static void atom_table_dump( struct object *obj, int verbose );
	static void atom_table_destroy( struct object *obj );

	static const struct object_ops atom_table_ops =
	{
	sizeof(struct atom_table), /* size */
	atom_table_dump, /* dump */
	no_add_queue, /* add_queue */
	NULL, /* remove_queue */
	NULL, /* signaled */
	NULL, /* satified */
	NULL, /* get_poll_events */
	NULL, /* poll_event */
	no_read_fd, /* get_read_fd */
	no_write_fd, /* get_write_fd */
	no_flush, /* flush */
	no_get_file_info, /* get_file_info */
	atom_table_destroy /* destroy */
	};

	static struct atom_table *global_table;


	/* copy an atom name to a temporary area */
	static const WCHAR copy_name( const WCHAR str )
	{
	static WCHAR buffer[MAX_ATOM_LEN+1];
	WCHAR *p = buffer;

	while (p < buffer + sizeof(buffer) - 1) if (!(p++ = str++)) break;
	*p = 0;
	return buffer;
	}

	/* create an atom table */
	static struct atom_table *create_table(int entries_count)
	{
	struct atom_table *table;

	if ((table = alloc_object( &atom_table_ops, -1 )))
	{
	if ((entries_count < MIN_HASH_SIZE) \|\|
	(entries_count > MAX_HASH_SIZE)) entries_count = HASH_SIZE;
	table->entries_count = entries_count;
	if (!(table->entries = malloc( sizeof(table->entries) table->entries_count )))
	{
	set_error( STATUS_NO_MEMORY );
	goto fail;
	}
	memset( table->entries, 0, sizeof(table->entries) table->entries_count );
	table->count = 64;
	table->last = -1;
	if ((table->handles = mem_alloc( sizeof(table->handles) table->count )))
	return table;
	fail:
	release_object( table );
	table = NULL;
	}
	return table;
	}

	/* retrieve an entry pointer from its atom */
	static struct atom_entry get_atom_entry( struct atom_table table, int atom )
	{
	struct atom_entry *entry = NULL;
	if (table && (atom >= 0) && (atom <= table->last)) entry = table->handles[atom];
	if (!entry) set_error( STATUS_INVALID_HANDLE );
	return entry;
	}

	/* add an atom entry in the table and return its handle */
	static int add_atom_entry( struct atom_table table, struct atom_entry entry )
	{
	int i;
	for (i = 0; i <= table->last; i++)
	if (!table->handles[i]) goto found;
	if (i == table->count)
	{
	struct atom_entry **new_table = NULL;
	int new_size = table->count + table->count / 2;
	if (new_size > MAX_ATOMS) new_size = MAX_ATOMS;
	if (new_size > table->count)
	new_table = realloc( table->handles, sizeof(table->handles) new_size );
	if (!new_table)
	{
	set_error( STATUS_NO_MEMORY );
	return -1;
	}
	table->count = new_size;
	table->handles = new_table;
	}
	table->last = i;
	found:
	table->handles[i] = entry;
	entry->atom = i;
	return i;
	}

	/* compute the hash code for a string */
	static int atom_hash( struct atom_table table, const WCHAR str )
	{
	int i;
	WCHAR hash = 0;
	for (i = 0; str[i]; i++) hash ^= towupper(str[i]) + i;
	return hash % table->entries_count;
	}

	/* dump an atom table */
	static void atom_table_dump( struct object *obj, int verbose )
	{
	int i;
	struct atom_table table = (struct atom_table )obj;
	assert( obj->ops == &atom_table_ops );

	fprintf( stderr, "Atom table size=%d entries=%d\n",
	table->last + 1, table->entries_count );
	if (!verbose) return;
	for (i = 0; i <= table->last; i++)
	{
	struct atom_entry *entry = table->handles[i];
	if (!entry) continue;
	fprintf( stderr, " %5d: ref=%d hash=%d \"", i, entry->count, entry->hash );
	dump_strW( entry->str, strlenW(entry->str), stderr, "\"\"");
	fprintf( stderr, "\"\n" );
	}
	}

	/* destroy the atom table */
	static void atom_table_destroy( struct object *obj )
	{
	int i;
	struct atom_table table = (struct atom_table )obj;
	assert( obj->ops == &atom_table_ops );
	if (table->handles)
	{
	for (i = 0; i <= table->last; i++) free( table->handles[i] );
	free( table->handles );
	}
	if (table->entries) free( table->entries );
	}

	/* find an atom entry in its hash list */
	static struct atom_entry find_atom_entry( struct atom_table table, const WCHAR *str, int hash )
	{
	struct atom_entry *entry = table->entries[hash];
	while (entry)
	{
	if (!strcmpiW( entry->str, str )) break;
	entry = entry->next;
	}
	return entry;
	}

	/* close the atom table; used on server exit */
	void close_atom_table(void)
	{
	if (global_table) release_object( global_table );
	}

	/* add an atom to the table */
	static int add_atom( struct atom_table table, const WCHAR str )
	{
	struct atom_entry *entry;
	int hash = atom_hash( table, str );
	int atom = -1;

	if (!*str)
	{
	set_error( STATUS_OBJECT_NAME_INVALID );
	return -1;
	}
	if ((entry = find_atom_entry( table, str, hash ))) /* exists already */
	{
	entry->count++;
	return entry->atom;
	}

	if ((entry = mem_alloc( sizeof(entry) + strlenW(str) sizeof(WCHAR) )))
	{
	if ((atom = add_atom_entry( table, entry )) != -1)
	{
	entry->prev = NULL;
	if ((entry->next = table->entries[hash])) entry->next->prev = entry;
	table->entries[hash] = entry;
	entry->count = 1;
	entry->hash = hash;
	strcpyW( entry->str, str );
	}
	else free( entry );
	}
	else set_error( STATUS_NO_MEMORY );
	return atom;
	}

	/* delete an atom from the table */
	static void delete_atom( struct atom_table *table, int atom )
	{
	struct atom_entry *entry = get_atom_entry( table, atom );
	if (entry && !--entry->count)
	{
	if (entry->next) entry->next->prev = entry->prev;
	if (entry->prev) entry->prev->next = entry->next;
	else table->entries[entry->hash] = entry->next;
	table->handles[atom] = NULL;
	free( entry );
	}
	}

	/* find an atom in the table */
	static int find_atom( struct atom_table table, const WCHAR str )
	{
	struct atom_entry *entry;

	if (table && ((entry = find_atom_entry( table, str, atom_hash(table, str) )))) return entry->atom;
	if (!*str) set_error( STATUS_OBJECT_NAME_INVALID );
	else set_error( STATUS_OBJECT_NAME_NOT_FOUND );
	return -1;
	}

	/* get an atom name and refcount*/
	static int get_atom_name( struct atom_table table, int atom, WCHAR str )
	{
	int count = -1;
	struct atom_entry *entry = get_atom_entry( table, atom );
	if (entry)
	{
	strcpyW( str, entry->str );
	count = entry->count;
	}
	return count;
	}

	/* add a global atom */
	DECL_HANDLER(add_atom)
	{
	struct atom_table **table_ptr = req->local ? &current->process->atom_table : &global_table;

	if (!table_ptr) table_ptr = create_table(0);
	if (table_ptr) req->atom = add_atom( table_ptr, copy_name( req->name ) );
	}

	/* delete a global atom */
	DECL_HANDLER(delete_atom)
	{
	delete_atom( req->local ? current->process->atom_table : global_table,
	req->atom );
	}

	/* find a global atom */
	DECL_HANDLER(find_atom)
	{
	req->atom = find_atom( req->local ? current->process->atom_table : global_table,
	copy_name( req->name ) );
	}

	/* get global atom name */
	DECL_HANDLER(get_atom_name)
	{
	req->name[0] = 0;
	req->count = get_atom_name( req->local ? current->process->atom_table : global_table,
	req->atom, req->name );
	}

	/* init the process atom table */
	DECL_HANDLER(init_atom_table)
	{
	if (!current->process->atom_table)
	current->process->atom_table = create_table( req->entries );
	}