[1022] | 1 | /* Copyright 2009, UCAR/Unidata and OPeNDAP, Inc. |
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| 2 | See the COPYRIGHT file for more information. */ |
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| 3 | |
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| 4 | /* |
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| 5 | * Copyright (c) 2009, Sun Microsystems, Inc. |
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| 6 | * All rights reserved. |
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| 7 | * |
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| 8 | * Redistribution and use in source and binary forms, with or without |
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| 9 | * modification, are permitted provided that the following conditions are met: |
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| 10 | * - Redistributions of source code must retain the above copyright notice, |
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| 11 | * this list of conditions and the following disclaimer. |
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| 12 | * - Redistributions in binary form must reproduce the above copyright notice, |
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| 13 | * this list of conditions and the following disclaimer in the documentation |
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| 14 | * and/or other materials provided with the distribution. |
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| 15 | * - Neither the name of Sun Microsystems, Inc. nor the names of its |
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| 16 | * contributors may be used to endorse or promote products derived |
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| 17 | * from this software without specific prior written permission. |
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| 18 | * |
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 20 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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| 23 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 29 | * POSSIBILITY OF SUCH DAMAGE. |
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| 30 | * |
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| 31 | * from: @(#)xdr.h 1.19 87/04/22 SMI |
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| 32 | * from: @(#)xdr.h 2.2 88/07/29 4.0 RPCSRC |
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| 33 | * $FreeBSD: src/include/rpc/xdr.h,v 1.23 2003/03/07 13:19:40 nectar Exp $ |
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| 34 | * $NetBSD: xdr.h,v 1.19 2000/07/17 05:00:45 matt Exp $ |
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| 35 | */ |
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| 36 | |
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| 37 | /* Define our own implementation of the needed |
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| 38 | elements of XDR. Assumes read-only |
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| 39 | */ |
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| 40 | |
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| 41 | #undef XXDRTRACE |
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| 42 | |
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| 43 | #include "config.h" |
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| 44 | #include <stdlib.h> |
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| 45 | #include <stdio.h> |
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| 46 | #include <assert.h> |
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| 47 | #include <string.h> |
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| 48 | #include <stdarg.h> |
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| 49 | #ifdef HAVE_UNISTD_H |
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| 50 | #include <unistd.h> |
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| 51 | #endif |
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| 52 | |
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| 53 | #include "xxdr.h" |
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| 54 | |
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| 55 | int xxdr_network_order; /* network order is big endian */ |
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| 56 | static int xxdr_big_endian; /* what is this machine? */ |
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| 57 | |
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| 58 | #ifdef XXDRTRACE |
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| 59 | static void |
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| 60 | xxdrtrace(XXDR* xdr, char* where, off_t arg) |
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| 61 | { |
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| 62 | fprintf(stderr,"xxdr: %s: arg=%ld ; pos=%ld len=%ld\n", |
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| 63 | where,arg,(long)xdr->pos,(long)xdr->length); |
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| 64 | fflush(stderr); |
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| 65 | } |
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| 66 | #else |
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| 67 | #define xxdrtrace(x,y,z) |
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| 68 | #endif |
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| 69 | |
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| 70 | /* Read-only operations */ |
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| 71 | |
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| 72 | int xxdr_getbytes(XXDR* xdrs, char* memory, off_t count) |
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| 73 | { |
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| 74 | if(!memory) return 0; |
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| 75 | if(!xdrs->getbytes(xdrs,memory,count)) |
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| 76 | return 0; |
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| 77 | return 1; |
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| 78 | } |
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| 79 | |
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| 80 | |
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| 81 | /* get a unsigned int from underlying stream*/ |
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| 82 | int |
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| 83 | xxdr_uint(XXDR* xdr, unsigned int* ip) |
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| 84 | { |
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| 85 | if(!ip) return 0; |
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| 86 | if(!xdr->getbytes(xdr,(char*)ip,sizeof(*ip))) |
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| 87 | return 0; |
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| 88 | /*convert from network order*/ |
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| 89 | if(!xxdr_network_order) { |
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| 90 | swapinline32(ip); |
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| 91 | } |
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| 92 | return 1; |
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| 93 | } |
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| 94 | |
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| 95 | /* get a long long from underlying stream*/ |
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| 96 | int |
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| 97 | xxdr_ulonglong(XXDR* xdr, unsigned long* llp) |
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| 98 | { |
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| 99 | /* Pull two units */ |
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| 100 | if(!llp) return 0; |
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| 101 | if(!xdr->getbytes(xdr,(char*)llp,sizeof(*llp))) |
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| 102 | return 0; |
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| 103 | /* Convert to signed/unsigned */ |
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| 104 | /*convert from network order*/ |
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| 105 | if(!xxdr_network_order) { |
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| 106 | swapinline64(llp); |
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| 107 | } |
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| 108 | return 1; |
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| 109 | } |
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| 110 | |
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| 111 | /* get some bytes from underlying stream; |
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| 112 | will move xdrs pointer to next XDRUNIT boundary*/ |
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| 113 | int |
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| 114 | xxdr_opaque(XXDR* xdr, char* mem, off_t count) |
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| 115 | { |
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| 116 | off_t pos,rounded; |
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| 117 | if(!xdr->getbytes(xdr,mem,count)) |
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| 118 | return 0; |
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| 119 | pos = xxdr_getpos(xdr); |
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| 120 | rounded = RNDUP(pos); |
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| 121 | return xxdr_skip(xdr,(rounded - pos)); |
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| 122 | } |
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| 123 | |
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| 124 | /* get counted string from underlying stream*/ |
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| 125 | int |
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| 126 | xxdr_string(XXDR* xdrs, char** sp, off_t* lenp) |
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| 127 | { |
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| 128 | char* s; |
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| 129 | unsigned int len; |
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| 130 | if(!xxdr_uint(xdrs,&len)) return 0; |
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| 131 | s = (char*)malloc((off_t)len+1); |
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| 132 | if(s == NULL) return 0; |
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| 133 | if(!xxdr_opaque(xdrs,s,len)) { |
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| 134 | free((void*)s); |
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| 135 | return 0; |
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| 136 | } |
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| 137 | s[len] = '\0'; /* make sure it is null terminated */ |
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| 138 | if(sp) *sp = s; |
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| 139 | if(lenp) *lenp = len; |
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| 140 | /* xxdr_opaque will have skippped any trailing bytes */ |
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| 141 | return 1; |
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| 142 | } |
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| 143 | |
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| 144 | /* returns bytes off from beginning*/ |
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| 145 | off_t |
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| 146 | xxdr_getpos(XXDR* xdr) |
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| 147 | { |
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| 148 | return xdr->getpos(xdr); |
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| 149 | } |
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| 150 | |
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| 151 | /* reposition the stream*/ |
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| 152 | int |
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| 153 | xxdr_setpos(XXDR* xdr, off_t pos) |
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| 154 | { |
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| 155 | return xdr->setpos(xdr,pos); |
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| 156 | } |
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| 157 | |
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| 158 | /* returns total available starting at current position */ |
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| 159 | off_t |
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| 160 | xxdr_getavail(XXDR* xdr) |
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| 161 | { |
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| 162 | return xdr->getavail(xdr); |
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| 163 | } |
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| 164 | |
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| 165 | /* free up XXDR structure */ |
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| 166 | void |
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| 167 | xxdr_free(XXDR* xdr) |
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| 168 | { |
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| 169 | xdr->free(xdr); |
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| 170 | } |
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| 171 | |
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| 172 | /***********************************/ |
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| 173 | |
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| 174 | /* Skip exacly "len" bytes in the input; any rounding must be done by the caller*/ |
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| 175 | int |
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| 176 | xxdr_skip(XXDR* xdrs, off_t len) |
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| 177 | { |
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| 178 | unsigned int pos; |
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| 179 | pos = xxdr_getpos(xdrs); |
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| 180 | pos = (pos + len); |
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| 181 | if(pos < 0) pos = 0; |
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| 182 | return xxdr_setpos(xdrs,pos); |
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| 183 | } |
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| 184 | |
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| 185 | /* skip "n" string/bytestring instances in the input*/ |
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| 186 | int |
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| 187 | xxdr_skip_strings(XXDR* xdrs, off_t n) |
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| 188 | { |
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| 189 | while(n-- > 0) { |
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| 190 | unsigned int slen; |
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| 191 | if(!xxdr_uint(xdrs,&slen)) return 0; |
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| 192 | slen = RNDUP(slen); |
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| 193 | if(xxdr_skip(xdrs,slen)) return 0; |
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| 194 | } |
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| 195 | return 1; |
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| 196 | } |
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| 197 | |
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| 198 | unsigned int |
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| 199 | xdr_roundup(unsigned int n) |
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| 200 | { |
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| 201 | unsigned int rounded; |
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| 202 | rounded = RNDUP(n); |
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| 203 | return rounded; |
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| 204 | } |
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| 205 | |
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| 206 | unsigned int |
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| 207 | ocbyteswap(unsigned int i) |
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| 208 | { |
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| 209 | unsigned int swap,b0,b1,b2,b3; |
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| 210 | b0 = (i>>24) & 0x000000ff; |
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| 211 | b1 = (i>>16) & 0x000000ff; |
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| 212 | b2 = (i>>8) & 0x000000ff; |
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| 213 | b3 = (i) & 0x000000ff; |
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| 214 | swap = (b0 | (b1 << 8) | (b2 << 16) | (b3 << 24)); |
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| 215 | return swap; |
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| 216 | } |
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| 217 | |
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| 218 | /**************************************************/ |
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| 219 | /* File based xdr */ |
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| 220 | static void |
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| 221 | xxdr_filefree(XXDR* xdrs) |
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| 222 | { |
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| 223 | if(xdrs != NULL) { |
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| 224 | (void)fflush((FILE *)xdrs->data); |
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| 225 | free(xdrs); |
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| 226 | } |
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| 227 | } |
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| 228 | |
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| 229 | static int |
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| 230 | xxdr_filegetbytes(XXDR* xdrs, char* addr, off_t len) |
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| 231 | { |
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| 232 | int ok = 1; |
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| 233 | int count; |
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| 234 | |
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| 235 | xxdrtrace(xdrs,"getbytes",len); |
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| 236 | if(len < 0) len = 0; |
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| 237 | if(!xdrs->valid) |
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| 238 | { |
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| 239 | if(fseek((FILE *)xdrs->data, xdrs->pos + xdrs->base, 0) != 0) { |
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| 240 | ok=0; |
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| 241 | goto done; |
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| 242 | } |
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| 243 | xdrs->valid = 1; |
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| 244 | } |
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| 245 | if(xdrs->pos + len > xdrs->length) |
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| 246 | return 0; |
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| 247 | if(len > 0) { |
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| 248 | count = fread(addr, len, 1, (FILE*)xdrs->data); |
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| 249 | if(count <= 0) { |
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| 250 | ok=0; |
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| 251 | goto done; |
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| 252 | } |
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| 253 | } |
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| 254 | xdrs->pos += len; |
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| 255 | done: |
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| 256 | return ok; |
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| 257 | } |
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| 258 | |
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| 259 | static off_t |
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| 260 | xxdr_filegetpos(XXDR* xdrs) |
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| 261 | { |
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| 262 | xxdrtrace(xdrs,"getpos",0); |
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| 263 | return xdrs->pos; |
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| 264 | } |
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| 265 | |
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| 266 | static off_t |
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| 267 | xxdr_filegetavail(XXDR* xdrs) |
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| 268 | { |
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| 269 | xxdrtrace(xdrs,"getavail",0); |
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| 270 | return (xdrs->length - xdrs->pos); |
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| 271 | } |
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| 272 | |
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| 273 | static int |
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| 274 | xxdr_filesetpos(XXDR* xdrs, off_t pos) |
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| 275 | { |
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| 276 | int ok = 1; |
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| 277 | xxdrtrace(xdrs,"setpos",pos); |
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| 278 | if(pos == xdrs->pos) goto done; |
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| 279 | if(pos < 0) pos = 0; |
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| 280 | if(pos > xdrs->length) {ok=0;goto done;} |
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| 281 | xdrs->pos = pos; |
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| 282 | xdrs->valid = 0; |
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| 283 | done: |
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| 284 | return ok; |
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| 285 | } |
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| 286 | |
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| 287 | |
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| 288 | /* |
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| 289 | Modified to track the current position to avoid the file io |
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| 290 | operation. Not sure if this worth the effort because I |
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| 291 | don't actually know the cost to doing an fseek |
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| 292 | */ |
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| 293 | |
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| 294 | /* |
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| 295 | * Initialize a stdio xdr stream. |
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| 296 | * Sets the xdr stream handle xdrs for use on the stream file. |
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| 297 | * Operation flag is set to op. |
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| 298 | */ |
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| 299 | XXDR* |
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| 300 | xxdr_filecreate(FILE* file, off_t base) |
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| 301 | { |
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| 302 | XXDR* xdrs = (XXDR*)calloc(1,sizeof(XXDR)); |
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| 303 | if(xdrs != NULL) { |
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| 304 | xdrs->data = (void*)file; |
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| 305 | xdrs->base = base; |
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| 306 | xdrs->pos = 0; |
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| 307 | xdrs->valid = 0; |
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| 308 | if(fseek(file,0L,SEEK_END)) return NULL; |
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| 309 | xdrs->length = (off_t)ftell(file); |
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| 310 | xdrs->length -= xdrs->base; |
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| 311 | xdrs->getbytes = xxdr_filegetbytes; |
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| 312 | xdrs->setpos = xxdr_filesetpos; |
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| 313 | xdrs->getpos = xxdr_filegetpos; |
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| 314 | xdrs->getavail = xxdr_filegetavail; |
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| 315 | xdrs->free = xxdr_filefree; |
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| 316 | } |
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| 317 | xxdrtrace(xdrs,"create",base); |
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| 318 | return xdrs; |
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| 319 | } |
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| 320 | |
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| 321 | /**************************************************/ |
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| 322 | /* memory based xdr */ |
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| 323 | |
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| 324 | static void |
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| 325 | xxdr_memfree(XXDR* xdrs) |
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| 326 | { |
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| 327 | if(xdrs != NULL) { |
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| 328 | free(xdrs); |
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| 329 | } |
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| 330 | } |
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| 331 | |
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| 332 | static int |
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| 333 | xxdr_memgetbytes(XXDR* xdrs, char* addr, off_t len) |
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| 334 | { |
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| 335 | int ok = 1; |
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| 336 | |
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| 337 | xxdrtrace(xdrs,"getbytes",len); |
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| 338 | if(len < 0) len = 0; |
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| 339 | if(xdrs->pos+len > xdrs->length) {ok=0; goto done;} |
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| 340 | if(len > 0) { |
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| 341 | memcpy(addr,(char*)xdrs->data+xdrs->base+xdrs->pos, len); |
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| 342 | } |
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| 343 | xdrs->pos += len; |
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| 344 | done: |
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| 345 | return ok; |
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| 346 | } |
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| 347 | |
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| 348 | static off_t |
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| 349 | xxdr_memgetpos(XXDR* xdrs) |
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| 350 | { |
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| 351 | xxdrtrace(xdrs,"getpos",0); |
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| 352 | return xdrs->pos; |
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| 353 | } |
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| 354 | |
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| 355 | static off_t |
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| 356 | xxdr_memgetavail(XXDR* xdrs) |
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| 357 | { |
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| 358 | xxdrtrace(xdrs,"getavail",0); |
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| 359 | return (xdrs->length - xdrs->pos); |
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| 360 | } |
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| 361 | |
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| 362 | |
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| 363 | static int |
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| 364 | xxdr_memsetpos(XXDR* xdrs, off_t pos) |
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| 365 | { |
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| 366 | int ok = 1; |
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| 367 | xxdrtrace(xdrs,"setpos",pos); |
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| 368 | if(pos == xdrs->pos) goto done; |
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| 369 | if(pos > xdrs->length) {ok=0; goto done;} |
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| 370 | xdrs->pos = pos; |
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| 371 | done: |
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| 372 | return ok; |
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| 373 | } |
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| 374 | |
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| 375 | /* |
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| 376 | Modified to track the current position to avoid the file io |
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| 377 | operation. Not sure if this worth the effort because I |
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| 378 | don't actually know the cost to doing an fseek |
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| 379 | */ |
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| 380 | |
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| 381 | /* |
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| 382 | * Initialize a stdio xdr stream. |
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| 383 | * Sets the xdr stream handle xdrs for use on the |
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| 384 | * given memory starting at base offset. |
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| 385 | */ |
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| 386 | XXDR* |
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| 387 | xxdr_memcreate(char* mem, off_t memsize, off_t base) |
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| 388 | { |
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| 389 | XXDR* xdrs = (XXDR*)calloc(1,sizeof(XXDR)); |
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| 390 | if(xdrs != NULL) { |
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| 391 | /* zero base memory */ |
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| 392 | xdrs->data = (void*)(mem + base); |
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| 393 | xdrs->base = 0; |
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| 394 | xdrs->length = memsize - base; |
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| 395 | xdrs->pos = 0; |
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| 396 | xdrs->getbytes = xxdr_memgetbytes; |
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| 397 | xdrs->setpos = xxdr_memsetpos; |
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| 398 | xdrs->getpos = xxdr_memgetpos; |
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| 399 | xdrs->getavail = xxdr_memgetavail; |
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| 400 | xdrs->free = xxdr_memfree; |
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| 401 | } |
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| 402 | xxdrtrace(xdrs,"create",base); |
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| 403 | return xdrs; |
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| 404 | } |
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| 405 | |
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| 406 | /* Float utility types */ |
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| 407 | |
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| 408 | /* get a float from underlying stream*/ |
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| 409 | int |
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| 410 | xxdr_float(XXDR* xdr, float* fp) |
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| 411 | { |
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| 412 | int status = 0; |
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| 413 | float f; |
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| 414 | unsigned int* data = (unsigned int*)&f; |
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| 415 | /* Pull one unit directly into a float */ |
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| 416 | status = xxdr_uint(xdr,data); |
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| 417 | if(status && fp) |
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| 418 | *fp = f; |
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| 419 | return status; |
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| 420 | } |
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| 421 | |
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| 422 | /* Get a double from underlying stream */ |
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| 423 | int |
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| 424 | xxdr_double(XXDR* xdr, double* dp) |
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| 425 | { |
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| 426 | int status = 0; |
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| 427 | char data[2*XDRUNIT]; |
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| 428 | /* Pull two units */ |
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| 429 | status = xxdr_opaque(xdr,data,2*XDRUNIT); |
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| 430 | if(status && dp) { |
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| 431 | xxdrntohdouble(data,dp); |
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| 432 | } |
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| 433 | return status; |
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| 434 | } |
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| 435 | |
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| 436 | /* Double needs special handling */ |
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| 437 | void |
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| 438 | xxdrntohdouble(char* c8, double* dp) |
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| 439 | { |
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| 440 | unsigned int ii[2]; |
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| 441 | memcpy(ii,c8,2*XDRUNIT); |
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| 442 | if(!xxdr_big_endian) { |
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| 443 | unsigned int tmp; |
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| 444 | /* reverse byte order */ |
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| 445 | swapinline32(&ii[0]); |
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| 446 | swapinline32(&ii[1]); |
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| 447 | /* interchange ii[0] and ii[1] */ |
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| 448 | tmp = ii[0]; |
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| 449 | ii[0] = ii[1]; |
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| 450 | ii[1] = tmp; |
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| 451 | } |
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| 452 | if(dp) *dp = *(double*)ii; |
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| 453 | } |
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| 454 | |
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| 455 | void |
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| 456 | xxdr_init() |
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| 457 | { |
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| 458 | /* Compute if we are same as network order v-a-v xdr */ |
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| 459 | int testint = 0x00000001; |
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| 460 | char *byte = (char *)&testint; |
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| 461 | xxdr_big_endian = (byte[0] == 0 ? 1 : 0); |
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| 462 | xxdr_network_order = xxdr_big_endian; |
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| 463 | } |
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