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 #ifdef __cplusplus 31 extern "C" { 32 #endif 33 34 35 36 static itm_size_t hash(const char *, itm_size_t, itm_size_t); 37 static itm_num_t hash_dense_encoding(const unsigned char *, itm_size_t, 38 const unsigned char *, 39 const unsigned char *); 40 41 42 static itm_size_t 43 hash(const char *ptr, itm_size_t size, itm_size_t hash_size) 44 { 45 itm_size_t value; 46 47 value = *(ptr++); 48 --size; 49 for (; 0 < size; --size) { 50 value *= 27239; 51 value += *(ptr++); 52 } 53 return (value % hash_size); 54 } 55 56 static itm_num_t 57 hash_dense_encoding( 58 const unsigned char *byte_seq, 59 itm_size_t length, 60 const unsigned char *byte_seq_min, 61 const unsigned char *byte_seq_max) 62 { 63 long i; 64 itm_num_t num; 65 66 num = (*byte_seq - *byte_seq_min); 67 byte_seq_min++; 68 byte_seq_max++; 69 for (i = 1, byte_seq++; i < length; 70 i++, byte_seq++, byte_seq_min++, byte_seq_max++) { 71 if ((*byte_seq < *byte_seq_min) || 72 (*byte_seq_max < *byte_seq)) { 73 return (-1); 74 } 75 num *= (*byte_seq_max - *byte_seq_min + 1); 76 num += (*byte_seq - *byte_seq_min); 77 } 78 return (num); 79 } 80 81 #ifdef __cplusplus 82 } 83 #endif 84 85 #endif /* !_ICONV_TM_HASH_H */ 86