330 lines
9.5 KiB
C
330 lines
9.5 KiB
C
/*
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* Server-side atom management
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*
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* Copyright (C) 1999, 2000 Alexandre Julliard
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* Copyright (C) 2000 Turchanov Sergei
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*/
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "unicode.h"
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#include "request.h"
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#include "object.h"
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#include "process.h"
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#define HASH_SIZE 37
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#define MIN_HASH_SIZE 4
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#define MAX_HASH_SIZE 0x200
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#define MAX_ATOM_LEN 255
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#define MAX_ATOMS 0x4000
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struct atom_entry
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{
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struct atom_entry *next; /* hash table list */
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struct atom_entry *prev; /* hash table list */
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int atom; /* atom handle */
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int count; /* reference count */
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int hash; /* string hash */
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WCHAR str[1]; /* atom string */
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};
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struct atom_table
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{
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struct object obj; /* object header */
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int count; /* count of atom handles */
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int last; /* last handle in-use */
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struct atom_entry **handles; /* atom handles */
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int entries_count; /* humber of hash entries */
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struct atom_entry **entries; /* hash table entries */
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};
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static void atom_table_dump( struct object *obj, int verbose );
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static void atom_table_destroy( struct object *obj );
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static const struct object_ops atom_table_ops =
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{
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sizeof(struct atom_table), /* size */
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atom_table_dump, /* dump */
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no_add_queue, /* add_queue */
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NULL, /* remove_queue */
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NULL, /* signaled */
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NULL, /* satified */
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NULL, /* get_poll_events */
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NULL, /* poll_event */
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no_read_fd, /* get_read_fd */
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no_write_fd, /* get_write_fd */
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no_flush, /* flush */
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no_get_file_info, /* get_file_info */
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atom_table_destroy /* destroy */
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};
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static struct atom_table *global_table;
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/* copy an atom name to a temporary area */
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static const WCHAR *copy_name( const WCHAR *str, size_t len )
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{
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static WCHAR buffer[MAX_ATOM_LEN+1];
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if (len > MAX_ATOM_LEN*sizeof(WCHAR))
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{
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set_error( STATUS_INVALID_PARAMETER );
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return NULL;
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}
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memcpy( buffer, str, len );
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buffer[len / sizeof(WCHAR)] = 0;
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return buffer;
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}
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/* create an atom table */
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static struct atom_table *create_table(int entries_count)
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{
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struct atom_table *table;
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if ((table = alloc_object( &atom_table_ops, -1 )))
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{
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if ((entries_count < MIN_HASH_SIZE) ||
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(entries_count > MAX_HASH_SIZE)) entries_count = HASH_SIZE;
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table->entries_count = entries_count;
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if (!(table->entries = malloc( sizeof(*table->entries) * table->entries_count )))
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{
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set_error( STATUS_NO_MEMORY );
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goto fail;
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}
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memset( table->entries, 0, sizeof(*table->entries) * table->entries_count );
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table->count = 64;
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table->last = -1;
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if ((table->handles = mem_alloc( sizeof(*table->handles) * table->count )))
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return table;
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fail:
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release_object( table );
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table = NULL;
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}
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return table;
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}
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/* retrieve an entry pointer from its atom */
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static struct atom_entry *get_atom_entry( struct atom_table *table, int atom )
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{
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struct atom_entry *entry = NULL;
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if (table && (atom >= 0) && (atom <= table->last)) entry = table->handles[atom];
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if (!entry) set_error( STATUS_INVALID_HANDLE );
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return entry;
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}
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/* add an atom entry in the table and return its handle */
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static int add_atom_entry( struct atom_table *table, struct atom_entry *entry )
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{
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int i;
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for (i = 0; i <= table->last; i++)
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if (!table->handles[i]) goto found;
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if (i == table->count)
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{
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struct atom_entry **new_table = NULL;
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int new_size = table->count + table->count / 2;
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if (new_size > MAX_ATOMS) new_size = MAX_ATOMS;
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if (new_size > table->count)
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new_table = realloc( table->handles, sizeof(*table->handles) * new_size );
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if (!new_table)
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{
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set_error( STATUS_NO_MEMORY );
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return -1;
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}
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table->count = new_size;
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table->handles = new_table;
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}
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table->last = i;
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found:
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table->handles[i] = entry;
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entry->atom = i;
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return i;
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}
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/* compute the hash code for a string */
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static int atom_hash( struct atom_table *table, const WCHAR *str )
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{
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int i;
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WCHAR hash = 0;
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for (i = 0; str[i]; i++) hash ^= toupperW(str[i]) + i;
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return hash % table->entries_count;
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}
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/* dump an atom table */
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static void atom_table_dump( struct object *obj, int verbose )
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{
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int i;
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struct atom_table *table = (struct atom_table *)obj;
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assert( obj->ops == &atom_table_ops );
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fprintf( stderr, "Atom table size=%d entries=%d\n",
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table->last + 1, table->entries_count );
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if (!verbose) return;
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for (i = 0; i <= table->last; i++)
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{
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struct atom_entry *entry = table->handles[i];
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if (!entry) continue;
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fprintf( stderr, " %5d: ref=%d hash=%d \"", i, entry->count, entry->hash );
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dump_strW( entry->str, strlenW(entry->str), stderr, "\"\"");
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fprintf( stderr, "\"\n" );
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}
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}
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/* destroy the atom table */
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static void atom_table_destroy( struct object *obj )
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{
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int i;
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struct atom_table *table = (struct atom_table *)obj;
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assert( obj->ops == &atom_table_ops );
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if (table->handles)
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{
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for (i = 0; i <= table->last; i++) free( table->handles[i] );
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free( table->handles );
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}
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if (table->entries) free( table->entries );
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}
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/* find an atom entry in its hash list */
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static struct atom_entry *find_atom_entry( struct atom_table *table, const WCHAR *str, int hash )
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{
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struct atom_entry *entry = table->entries[hash];
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while (entry)
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{
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if (!strcmpiW( entry->str, str )) break;
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entry = entry->next;
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}
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return entry;
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}
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/* close the atom table; used on server exit */
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void close_atom_table(void)
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{
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if (global_table) release_object( global_table );
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}
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/* add an atom to the table */
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static int add_atom( struct atom_table *table, const WCHAR *str )
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{
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struct atom_entry *entry;
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int hash = atom_hash( table, str );
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int atom = -1;
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if (!*str)
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{
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set_error( STATUS_OBJECT_NAME_INVALID );
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return -1;
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}
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if ((entry = find_atom_entry( table, str, hash ))) /* exists already */
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{
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entry->count++;
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return entry->atom;
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}
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if ((entry = mem_alloc( sizeof(*entry) + strlenW(str) * sizeof(WCHAR) )))
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{
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if ((atom = add_atom_entry( table, entry )) != -1)
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{
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entry->prev = NULL;
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if ((entry->next = table->entries[hash])) entry->next->prev = entry;
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table->entries[hash] = entry;
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entry->count = 1;
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entry->hash = hash;
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strcpyW( entry->str, str );
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}
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else free( entry );
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}
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else set_error( STATUS_NO_MEMORY );
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return atom;
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}
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/* delete an atom from the table */
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static void delete_atom( struct atom_table *table, int atom )
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{
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struct atom_entry *entry = get_atom_entry( table, atom );
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if (entry && !--entry->count)
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{
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if (entry->next) entry->next->prev = entry->prev;
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if (entry->prev) entry->prev->next = entry->next;
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else table->entries[entry->hash] = entry->next;
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table->handles[atom] = NULL;
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free( entry );
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}
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}
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/* find an atom in the table */
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static int find_atom( struct atom_table *table, const WCHAR *str )
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{
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struct atom_entry *entry;
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if (table && ((entry = find_atom_entry( table, str, atom_hash(table, str) )))) return entry->atom;
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if (!*str) set_error( STATUS_OBJECT_NAME_INVALID );
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else set_error( STATUS_OBJECT_NAME_NOT_FOUND );
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return -1;
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}
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/* get an atom name and refcount*/
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static size_t get_atom_name( struct atom_table *table, int atom,
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WCHAR *str, size_t maxsize, int *count )
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{
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size_t len = 0;
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struct atom_entry *entry = get_atom_entry( table, atom );
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*count = -1;
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if (entry)
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{
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*count = entry->count;
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len = strlenW( entry->str ) * sizeof(WCHAR);
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if (len <= maxsize) memcpy( str, entry->str, len );
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else
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{
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set_error( STATUS_BUFFER_OVERFLOW );
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len = 0;
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}
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}
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return len;
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}
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/* add a global atom */
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DECL_HANDLER(add_atom)
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{
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struct atom_table **table_ptr = req->local ? ¤t->process->atom_table : &global_table;
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if (!*table_ptr) *table_ptr = create_table(0);
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if (*table_ptr)
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{
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const WCHAR *name = copy_name( get_req_data(req), get_req_data_size(req) );
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if (name) req->atom = add_atom( *table_ptr, name );
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}
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}
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/* delete a global atom */
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DECL_HANDLER(delete_atom)
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{
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delete_atom( req->local ? current->process->atom_table : global_table, req->atom );
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}
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/* find a global atom */
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DECL_HANDLER(find_atom)
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{
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const WCHAR *name = copy_name( get_req_data(req), get_req_data_size(req) );
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if (name)
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req->atom = find_atom( req->local ? current->process->atom_table : global_table, name );
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}
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/* get global atom name */
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DECL_HANDLER(get_atom_name)
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{
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WCHAR *name = get_req_data(req);
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size_t size = get_atom_name( req->local ? current->process->atom_table : global_table,
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req->atom, name, get_req_data_size(req), &req->count );
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set_req_data_size( req, size );
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}
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/* init the process atom table */
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DECL_HANDLER(init_atom_table)
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{
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if (!current->process->atom_table)
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current->process->atom_table = create_table( req->entries );
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}
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