1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 1999 by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 #ifndef _ICONV_TM_HASH_H 28 #define _ICONV_TM_HASH_H 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 33 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 38 39 static itm_size_t hash(const char *, itm_size_t, itm_size_t); 40 static itm_num_t hash_dense_encoding(const unsigned char *, itm_size_t, 41 const unsigned char *, 42 const unsigned char *); 43 44 45 static itm_size_t 46 hash(const char *ptr, itm_size_t size, itm_size_t hash_size) 47 { 48 itm_size_t value; 49 50 value = *(ptr++); 51 --size; 52 for (; 0 < size; --size) { 53 value *= 27239; 54 value += *(ptr++); 55 } 56 return (value % hash_size); 57 } 58 59 static itm_num_t 60 hash_dense_encoding( 61 const unsigned char *byte_seq, 62 itm_size_t length, 63 const unsigned char *byte_seq_min, 64 const unsigned char *byte_seq_max) 65 { 66 long i; 67 itm_num_t num; 68 69 num = (*byte_seq - *byte_seq_min); 70 byte_seq_min++; 71 byte_seq_max++; 72 for (i = 1, byte_seq++; i < length; 73 i++, byte_seq++, byte_seq_min++, byte_seq_max++) { 74 if ((*byte_seq < *byte_seq_min) || 75 (*byte_seq_max < *byte_seq)) { 76 return (-1); 77 } 78 num *= (*byte_seq_max - *byte_seq_min + 1); 79 num += (*byte_seq - *byte_seq_min); 80 } 81 return (num); 82 } 83 84 #ifdef __cplusplus 85 } 86 #endif 87 88 #endif /* !_ICONV_TM_HASH_H */ 89