257 lines
7.7 KiB
C
257 lines
7.7 KiB
C
/* -*- Mode: C; indent-tabs-mode: nil; -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the TripleDB database library.
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*
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* The Initial Developer of the Original Code is
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* Geocast Network Systems.
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* Portions created by the Initial Developer are Copyright (C) 2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Terry Weissman <terry@mozilla.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "tdbtypes.h"
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#include "node.h"
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#include "util.h"
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TDBNodePtr TDBCreateStringNode(const char* string)
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{
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TDBNode* result;
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TDBInt32 length;
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tdb_ASSERT(string != NULL);
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if (string == NULL) return NULL;
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length = strlen(string);
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if (length > 65535) {
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tdb_ASSERT(0); /* Don't call us with huge strings! */
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return NULL;
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}
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result = (TDBNode*) tdb_Malloc(sizeof(TDBNode) + length + 1);
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if (result == NULL) return NULL;
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result->type = TDBTYPE_STRING;
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result->d.str.length = length;
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strcpy(result->d.str.string, string);
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return result;
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}
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TDBNodePtr TDBCreateIntNode(TDBInt64 value, TDBInt8 type)
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{
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TDBNode* result;
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if ((type < TDBTYPE_INT32 || type >= TDBTYPE_STRING) && type !=
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TDBTYPE_INTERNED) {
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tdb_ASSERT(0);
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return NULL;
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}
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result = tdb_NEWZAP(TDBNode);
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if (result == NULL) return NULL;
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result->type = type;
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result->d.i = value;
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return result;
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}
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TDBNodePtr tdbCreateSpecialNode(TDBInt8 type)
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{
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TDBNodePtr result;
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tdb_ASSERT(type == TDBTYPE_MINNODE || type == TDBTYPE_MAXNODE);
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result = tdb_NEWZAP(TDBNode);
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if (result == NULL) return NULL;
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result->type = type;
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return result;
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}
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void TDBFreeNode(TDBNode* node)
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{
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tdb_Free(node);
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}
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TDBNode* TDBNodeDup(TDBNode* node)
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{
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TDBNode* result;
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TDBInt32 length;
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tdb_ASSERT(node != NULL);
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if (node == NULL) return NULL;
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if (node->type == TDBTYPE_STRING) {
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length = node->d.str.length;
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result = tdb_Malloc(sizeof(TDBNode) + length + 1);
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if (result == NULL) return NULL;
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result->type = TDBTYPE_STRING;
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result->d.str.length = length;
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memcpy(result->d.str.string, node->d.str.string, length);
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result->d.str.string[length] = '\0';
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return result;
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}
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if (node->type == TDBTYPE_MINNODE || node->type == TDBTYPE_MAXNODE) {
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return tdbCreateSpecialNode(node->type);
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}
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return TDBCreateIntNode(node->d.i, node->type);
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}
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TDBInt32 tdbNodeSize(TDBNode* node)
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{
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tdb_ASSERT(node != NULL);
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if (node == NULL) return 0;
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switch (node->type) {
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case TDBTYPE_INT32:
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return 1 + sizeof(TDBInt32);
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case TDBTYPE_INT64:
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return 1 + sizeof(TDBInt64);
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case TDBTYPE_ID:
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return 1 + sizeof(TDBUint64);
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case TDBTYPE_TIME:
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return 1 + sizeof(TDBTime);
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case TDBTYPE_STRING:
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return 1 + node->d.str.length + 1;
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case TDBTYPE_BLOB:
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return 1 + sizeof(TDBUint16) + node->d.str.length;
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case TDBTYPE_INTERNED:
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return 1 + sizeof(TDBUint32);
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default:
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tdb_ASSERT(0);
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return 0;
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}
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}
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TDBStatus tdbPutNode(char** ptr, TDBNode* node, char* endptr)
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{
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if (tdbPutInt8(ptr, node->type, endptr) != TDB_SUCCESS) {
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return TDB_FAILURE;
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}
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switch (node->type) {
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case TDBTYPE_STRING:
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if (endptr - *ptr <= node->d.str.length) return TDB_FAILURE;
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memcpy(*ptr, node->d.str.string, node->d.str.length);
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*ptr += node->d.str.length;
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*(*ptr)++ = '\0';
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return TDB_SUCCESS;
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case TDBTYPE_BLOB:
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tdbPutUInt16(ptr, node->d.str.length, endptr);
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if (endptr - *ptr < node->d.str.length) {
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return TDB_FAILURE;
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}
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memcpy(*ptr, node->d.str.string, node->d.str.length);
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*ptr += node->d.str.length;
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return TDB_SUCCESS;
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case TDBTYPE_INT32:
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return tdbPutInt32(ptr, (TDBInt32) node->d.i, endptr);
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case TDBTYPE_INT64:
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case TDBTYPE_TIME:
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return tdbPutInt64(ptr, node->d.i, endptr);
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case TDBTYPE_ID:
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return tdbPutUInt64(ptr, node->d.i, endptr);
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case TDBTYPE_INTERNED:
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return tdbPutUInt32(ptr, node->d.i, endptr);
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case TDBTYPE_MINNODE:
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case TDBTYPE_MAXNODE:
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return TDB_SUCCESS;
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default:
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tdb_ASSERT(0);
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return TDB_FAILURE;
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}
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}
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TDBNode* tdbGetNode(char** ptr, char* endptr)
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{
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TDBNode* result;
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TDBInt8 type;
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TDBInt64 i;
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TDBUint16 length;
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char* p;
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type = tdbGetInt8(ptr, endptr);
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if (*ptr >= endptr) return NULL;
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switch (type) {
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case TDBTYPE_STRING:
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for (p = *ptr ; p <= endptr && *p ; p++) {}
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if (p > endptr) return NULL;
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length = p - *ptr;
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result = (TDBNode*) tdb_Malloc(sizeof(TDBNode) + length + 1);
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if (result == NULL) {
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return NULL;
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}
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result->type = type;
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result->d.str.length = length;
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memcpy(result->d.str.string, *ptr, length + 1);
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*ptr = p + 1;
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return result;
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case TDBTYPE_BLOB:
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length = tdbGetUInt16(ptr, endptr);
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if (*ptr > endptr) return NULL;
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if (*ptr + length > endptr) return NULL;
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result = (TDBNode*) tdb_Malloc(sizeof(TDBNode) + length + 1);
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if (result == NULL) {
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return NULL;
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}
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result->type = type;
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result->d.str.length = length;
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memcpy(result->d.str.string, *ptr, length);
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result->d.str.string[length] = '\0';
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(*ptr) += length;
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return result;
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case TDBTYPE_INT32:
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i = tdbGetInt32(ptr, endptr);
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break;
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case TDBTYPE_INT64:
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case TDBTYPE_TIME:
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i = tdbGetInt64(ptr, endptr);
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break;
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case TDBTYPE_ID:
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i = tdbGetUInt64(ptr, endptr);
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break;
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case TDBTYPE_INTERNED:
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i = tdbGetUInt32(ptr, endptr);
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break;
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default:
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return NULL;
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}
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return TDBCreateIntNode(i, type);
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}
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TDBInt64 TDBCompareNodes(TDBNode* n1, TDBNode* n2)
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{
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TDBInt64 result;
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if (n1->type != n2->type) {
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return n1->type - n2->type;
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} else if (n1->type == TDBTYPE_STRING || n1->type == TDBTYPE_BLOB) {
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result = memcmp(n1->d.str.string, n2->d.str.string,
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n1->d.str.length < n2->d.str.length ?
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n1->d.str.length : n2->d.str.length);
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if (result != 0) return result;
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return ((TDBInt64) n1->d.str.length) - ((TDBInt64) n2->d.str.length);
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} else {
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return n1->d.i - n2->d.i;
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}
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}
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