[df49c60] | 1 | /* |
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| 2 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
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| 3 | * unrestricted use provided that this legend is included on all tape |
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| 4 | * media and as a part of the software program in whole or part. Users |
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| 5 | * may copy or modify Sun RPC without charge, but are not authorized |
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| 6 | * to license or distribute it to anyone else except as part of a product or |
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| 7 | * program developed by the user. |
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| 8 | * |
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| 9 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
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| 10 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
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| 11 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
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| 12 | * |
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| 13 | * Sun RPC is provided with no support and without any obligation on the |
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| 14 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
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| 15 | * modification or enhancement. |
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| 16 | * |
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| 17 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
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| 18 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
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| 19 | * OR ANY PART THEREOF. |
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| 20 | * |
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| 21 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
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| 22 | * or profits or other special, indirect and consequential damages, even if |
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| 23 | * Sun has been advised of the possibility of such damages. |
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| 24 | * |
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| 25 | * Sun Microsystems, Inc. |
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| 26 | * 2550 Garcia Avenue |
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| 27 | * Mountain View, California 94043 |
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| 28 | */ |
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| 29 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 30 | /*static char *sccsid = "from: @(#)xdr_rec.c 1.21 87/08/11 Copyr 1984 Sun Micro";*/ |
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| 31 | /*static char *sccsid = "from: @(#)xdr_rec.c 2.2 88/08/01 4.0 RPCSRC";*/ |
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| 32 | static char *rcsid = "$FreeBSD: src/lib/libc/xdr/xdr_rec.c,v 1.12 2000/01/19 06:12:32 wpaul Exp $"; |
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| 33 | #endif |
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| 34 | |
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| 35 | /* |
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| 36 | * xdr_rec.c, Implements TCP/IP based XDR streams with a "record marking" |
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| 37 | * layer above tcp (for rpc's use). |
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| 38 | * |
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| 39 | * Copyright (C) 1984, Sun Microsystems, Inc. |
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| 40 | * |
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| 41 | * These routines interface XDRSTREAMS to a tcp/ip connection. |
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| 42 | * There is a record marking layer between the xdr stream |
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| 43 | * and the tcp transport level. A record is composed on one or more |
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| 44 | * record fragments. A record fragment is a thirty-two bit header followed |
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| 45 | * by n bytes of data, where n is contained in the header. The header |
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| 46 | * is represented as a htonl(u_long). Thegh order bit encodes |
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| 47 | * whether or not the fragment is the last fragment of the record |
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| 48 | * (1 => fragment is last, 0 => more fragments to follow. |
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| 49 | * The other 31 bits encode the byte length of the fragment. |
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| 50 | */ |
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| 51 | |
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| 52 | #include <stdio.h> |
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| 53 | #include <stdlib.h> |
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| 54 | #include <string.h> |
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| 55 | #include <rpc/types.h> |
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| 56 | #include <rpc/xdr.h> |
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| 57 | #include <netinet/in.h> |
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| 58 | #include <unistd.h> /* for lseek() */ |
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| 59 | |
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| 60 | static u_int fix_buf_size(); |
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| 61 | static bool_t flush_out(); |
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| 62 | static bool_t get_input_bytes(); |
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| 63 | static bool_t set_input_fragment(); |
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| 64 | static bool_t skip_input_bytes(); |
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| 65 | |
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| 66 | static bool_t xdrrec_getlong(); |
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| 67 | static bool_t xdrrec_putlong(); |
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| 68 | static bool_t xdrrec_getbytes(); |
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| 69 | static bool_t xdrrec_putbytes(); |
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| 70 | static u_int xdrrec_getpos(); |
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| 71 | static bool_t xdrrec_setpos(); |
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| 72 | static int32_t *xdrrec_inline(); |
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| 73 | static void xdrrec_destroy(); |
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| 74 | |
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| 75 | static struct xdr_ops xdrrec_ops = { |
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| 76 | xdrrec_getlong, |
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| 77 | xdrrec_putlong, |
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| 78 | xdrrec_getbytes, |
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| 79 | xdrrec_putbytes, |
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| 80 | xdrrec_getpos, |
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| 81 | xdrrec_setpos, |
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| 82 | xdrrec_inline, |
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| 83 | xdrrec_destroy |
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| 84 | }; |
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| 85 | |
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| 86 | /* |
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| 87 | * A record is composed of one or more record fragments. |
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| 88 | * A record fragment is a two-byte header followed by zero to |
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| 89 | * 2**32-1 bytes. The header is treated as a long unsigned and is |
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| 90 | * encode/decoded to the network via htonl/ntohl. The low order 31 bits |
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| 91 | * are a byte count of the fragment. The highest order bit is a boolean: |
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| 92 | * 1 => this fragment is the last fragment of the record, |
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| 93 | * 0 => this fragment is followed by more fragment(s). |
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| 94 | * |
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| 95 | * The fragment/record machinery is not general; it is constructed to |
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| 96 | * meet the needs of xdr and rpc based on tcp. |
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| 97 | */ |
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| 98 | |
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| 99 | #define LAST_FRAG ((u_int32_t)(1 << 31)) |
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| 100 | |
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| 101 | typedef struct rec_strm { |
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| 102 | caddr_t tcp_handle; |
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| 103 | caddr_t the_buffer; |
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| 104 | /* |
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| 105 | * out-goung bits |
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| 106 | */ |
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| 107 | int (*writeit) __P((caddr_t, caddr_t, int)); |
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| 108 | caddr_t out_base; /* output buffer (points to frag header) */ |
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| 109 | caddr_t out_finger; /* next output position */ |
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| 110 | caddr_t out_boundry; /* data cannot up to this address */ |
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| 111 | u_int32_t *frag_header; /* beginning of current fragment */ |
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| 112 | bool_t frag_sent; /* true if buffer sent in middle of record */ |
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| 113 | /* |
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| 114 | * in-coming bits |
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| 115 | */ |
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| 116 | int (*readit) __P((caddr_t, caddr_t, int)); |
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| 117 | u_long in_size; /* fixed size of the input buffer */ |
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| 118 | caddr_t in_base; |
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| 119 | caddr_t in_finger; /* location of next byte to be had */ |
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| 120 | caddr_t in_boundry; /* can read up to this location */ |
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| 121 | long fbtbc; /* fragment bytes to be consumed */ |
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| 122 | bool_t last_frag; |
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| 123 | u_int sendsize; |
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| 124 | u_int recvsize; |
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| 125 | } RECSTREAM; |
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| 126 | |
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| 127 | |
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| 128 | /* |
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| 129 | * Create an xdr handle for xdrrec |
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| 130 | * xdrrec_create fills in xdrs. Sendsize and recvsize are |
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| 131 | * send and recv buffer sizes (0 => use default). |
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| 132 | * tcp_handle is an opaque handle that is passed as the first parameter to |
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| 133 | * the procedures readit and writeit. Readit and writeit are read and |
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| 134 | * write respectively. They are like the system |
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| 135 | * calls expect that they take an opaque handle rather than an fd. |
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| 136 | */ |
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| 137 | void |
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| 138 | xdrrec_create(xdrs, sendsize, recvsize, tcp_handle, readit, writeit) |
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| 139 | register XDR *xdrs; |
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| 140 | register u_int sendsize; |
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| 141 | register u_int recvsize; |
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| 142 | caddr_t tcp_handle; |
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| 143 | int (*readit)(); /* like read, but pass it a tcp_handle, not sock */ |
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| 144 | int (*writeit)(); /* like write, but pass it a tcp_handle, not sock */ |
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| 145 | { |
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| 146 | register RECSTREAM *rstrm = |
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| 147 | (RECSTREAM *)mem_alloc(sizeof(RECSTREAM)); |
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| 148 | |
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| 149 | if (rstrm == NULL) { |
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| 150 | (void)fprintf(stderr, "xdrrec_create: out of memory\n"); |
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| 151 | /* |
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| 152 | * This is bad. Should rework xdrrec_create to |
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| 153 | * return a handle, and in this case return NULL |
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| 154 | */ |
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| 155 | return; |
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| 156 | } |
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| 157 | /* |
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| 158 | * adjust sizes and allocate buffer quad byte aligned |
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| 159 | */ |
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| 160 | rstrm->sendsize = sendsize = fix_buf_size(sendsize); |
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| 161 | rstrm->recvsize = recvsize = fix_buf_size(recvsize); |
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| 162 | rstrm->the_buffer = mem_alloc(sendsize + recvsize + BYTES_PER_XDR_UNIT); |
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| 163 | if (rstrm->the_buffer == NULL) { |
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| 164 | (void)fprintf(stderr, "xdrrec_create: out of memory\n"); |
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| 165 | return; |
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| 166 | } |
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| 167 | for (rstrm->out_base = rstrm->the_buffer; |
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| 168 | (u_long)rstrm->out_base % BYTES_PER_XDR_UNIT != 0; |
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| 169 | rstrm->out_base++); |
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| 170 | rstrm->in_base = rstrm->out_base + sendsize; |
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| 171 | /* |
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| 172 | * now the rest ... |
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| 173 | */ |
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| 174 | xdrs->x_ops = &xdrrec_ops; |
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| 175 | xdrs->x_private = (caddr_t)rstrm; |
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| 176 | rstrm->tcp_handle = tcp_handle; |
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| 177 | rstrm->readit = readit; |
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| 178 | rstrm->writeit = writeit; |
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| 179 | rstrm->out_finger = rstrm->out_boundry = rstrm->out_base; |
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| 180 | rstrm->frag_header = (u_int32_t *)rstrm->out_base; |
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| 181 | rstrm->out_finger += sizeof(u_int32_t); |
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| 182 | rstrm->out_boundry += sendsize; |
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| 183 | rstrm->frag_sent = FALSE; |
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| 184 | rstrm->in_size = recvsize; |
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| 185 | rstrm->in_boundry = rstrm->in_base; |
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| 186 | rstrm->in_finger = (rstrm->in_boundry += recvsize); |
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| 187 | rstrm->fbtbc = 0; |
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| 188 | rstrm->last_frag = TRUE; |
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| 189 | } |
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| 190 | |
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| 191 | |
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| 192 | /* |
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| 193 | * The reoutines defined below are the xdr ops which will go into the |
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| 194 | * xdr handle filled in by xdrrec_create. |
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| 195 | */ |
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| 196 | |
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| 197 | static bool_t |
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| 198 | xdrrec_getlong(xdrs, lp) |
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| 199 | XDR *xdrs; |
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| 200 | long *lp; |
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| 201 | { |
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| 202 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 203 | register int32_t *buflp = (int32_t *)(rstrm->in_finger); |
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| 204 | int32_t mylong; |
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| 205 | |
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| 206 | /* first try the inline, fast case */ |
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| 207 | if ((rstrm->fbtbc >= sizeof(int32_t)) && |
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| 208 | (((long)rstrm->in_boundry - (long)buflp) >= sizeof(int32_t))) { |
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| 209 | *lp = (long)ntohl((u_int32_t)(*buflp)); |
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| 210 | rstrm->fbtbc -= sizeof(int32_t); |
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| 211 | rstrm->in_finger += sizeof(int32_t); |
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| 212 | } else { |
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| 213 | if (! xdrrec_getbytes(xdrs, (caddr_t)&mylong, sizeof(int32_t))) |
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| 214 | return (FALSE); |
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| 215 | *lp = (long)ntohl((u_int32_t)mylong); |
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| 216 | } |
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| 217 | return (TRUE); |
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| 218 | } |
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| 219 | |
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| 220 | static bool_t |
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| 221 | xdrrec_putlong(xdrs, lp) |
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| 222 | XDR *xdrs; |
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| 223 | long *lp; |
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| 224 | { |
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| 225 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 226 | register int32_t *dest_lp = ((int32_t *)(rstrm->out_finger)); |
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| 227 | |
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| 228 | if ((rstrm->out_finger += sizeof(int32_t)) > rstrm->out_boundry) { |
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| 229 | /* |
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| 230 | * this case should almost never happen so the code is |
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| 231 | * inefficient |
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| 232 | */ |
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| 233 | rstrm->out_finger -= sizeof(int32_t); |
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| 234 | rstrm->frag_sent = TRUE; |
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| 235 | if (! flush_out(rstrm, FALSE)) |
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| 236 | return (FALSE); |
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| 237 | dest_lp = ((int32_t *)(rstrm->out_finger)); |
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| 238 | rstrm->out_finger += sizeof(int32_t); |
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| 239 | } |
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| 240 | *dest_lp = (int32_t)htonl((u_int32_t)(*lp)); |
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| 241 | return (TRUE); |
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| 242 | } |
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| 243 | |
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| 244 | static bool_t /* must manage buffers, fragments, and records */ |
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| 245 | xdrrec_getbytes(xdrs, addr, len) |
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| 246 | XDR *xdrs; |
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| 247 | register caddr_t addr; |
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| 248 | register u_int len; |
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| 249 | { |
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| 250 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 251 | register int current; |
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| 252 | |
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| 253 | while (len > 0) { |
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| 254 | current = rstrm->fbtbc; |
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| 255 | if (current == 0) { |
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| 256 | if (rstrm->last_frag) |
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| 257 | return (FALSE); |
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| 258 | if (! set_input_fragment(rstrm)) |
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| 259 | return (FALSE); |
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| 260 | continue; |
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| 261 | } |
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| 262 | current = (len < current) ? len : current; |
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| 263 | if (! get_input_bytes(rstrm, addr, current)) |
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| 264 | return (FALSE); |
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| 265 | addr += current; |
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| 266 | rstrm->fbtbc -= current; |
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| 267 | len -= current; |
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| 268 | } |
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| 269 | return (TRUE); |
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| 270 | } |
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| 271 | |
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| 272 | static bool_t |
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| 273 | xdrrec_putbytes(xdrs, addr, len) |
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| 274 | XDR *xdrs; |
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| 275 | register caddr_t addr; |
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| 276 | register u_int len; |
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| 277 | { |
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| 278 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 279 | register long current; |
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| 280 | |
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| 281 | while (len > 0) { |
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| 282 | current = (u_long)rstrm->out_boundry - |
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| 283 | (u_long)rstrm->out_finger; |
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| 284 | current = (len < current) ? len : current; |
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| 285 | memcpy(rstrm->out_finger, addr, current); |
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| 286 | rstrm->out_finger += current; |
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| 287 | addr += current; |
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| 288 | len -= current; |
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| 289 | if (rstrm->out_finger == rstrm->out_boundry) { |
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| 290 | rstrm->frag_sent = TRUE; |
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| 291 | if (! flush_out(rstrm, FALSE)) |
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| 292 | return (FALSE); |
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| 293 | } |
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| 294 | } |
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| 295 | return (TRUE); |
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| 296 | } |
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| 297 | |
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| 298 | static u_int |
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| 299 | xdrrec_getpos(xdrs) |
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| 300 | register XDR *xdrs; |
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| 301 | { |
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| 302 | register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; |
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| 303 | register long pos; |
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| 304 | |
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| 305 | pos = lseek((int)(long)rstrm->tcp_handle, (off_t) 0, 1); |
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| 306 | if (pos != -1) |
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| 307 | switch (xdrs->x_op) { |
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| 308 | |
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| 309 | case XDR_ENCODE: |
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| 310 | pos += rstrm->out_finger - rstrm->out_base; |
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| 311 | break; |
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| 312 | |
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| 313 | case XDR_DECODE: |
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| 314 | pos -= rstrm->in_boundry - rstrm->in_finger; |
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| 315 | break; |
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| 316 | |
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| 317 | default: |
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| 318 | pos = -1; |
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| 319 | break; |
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| 320 | } |
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| 321 | return ((u_int) pos); |
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| 322 | } |
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| 323 | |
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| 324 | static bool_t |
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| 325 | xdrrec_setpos(xdrs, pos) |
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| 326 | register XDR *xdrs; |
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| 327 | u_int pos; |
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| 328 | { |
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| 329 | register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; |
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| 330 | u_int currpos = xdrrec_getpos(xdrs); |
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| 331 | int delta = currpos - pos; |
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| 332 | caddr_t newpos; |
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| 333 | |
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| 334 | if ((int)currpos != -1) |
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| 335 | switch (xdrs->x_op) { |
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| 336 | |
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| 337 | case XDR_ENCODE: |
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| 338 | newpos = rstrm->out_finger - delta; |
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| 339 | if ((newpos > (caddr_t)(rstrm->frag_header)) && |
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| 340 | (newpos < rstrm->out_boundry)) { |
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| 341 | rstrm->out_finger = newpos; |
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| 342 | return (TRUE); |
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| 343 | } |
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| 344 | break; |
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| 345 | |
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| 346 | case XDR_DECODE: |
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| 347 | newpos = rstrm->in_finger - delta; |
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| 348 | if ((delta < (int)(rstrm->fbtbc)) && |
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| 349 | (newpos <= rstrm->in_boundry) && |
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| 350 | (newpos >= rstrm->in_base)) { |
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| 351 | rstrm->in_finger = newpos; |
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| 352 | rstrm->fbtbc -= delta; |
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| 353 | return (TRUE); |
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| 354 | } |
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| 355 | break; |
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| 356 | case XDR_FREE: /* to avoid warning */ |
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| 357 | break; |
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| 358 | } |
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| 359 | return (FALSE); |
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| 360 | } |
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| 361 | |
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| 362 | static int32_t * |
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| 363 | xdrrec_inline(xdrs, len) |
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| 364 | register XDR *xdrs; |
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| 365 | int len; |
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| 366 | { |
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| 367 | register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; |
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| 368 | int32_t * buf = NULL; |
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| 369 | |
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| 370 | switch (xdrs->x_op) { |
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| 371 | |
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| 372 | case XDR_ENCODE: |
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| 373 | if ((rstrm->out_finger + len) <= rstrm->out_boundry) { |
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| 374 | buf = (int32_t *) rstrm->out_finger; |
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| 375 | rstrm->out_finger += len; |
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| 376 | } |
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| 377 | break; |
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| 378 | |
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| 379 | case XDR_DECODE: |
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| 380 | if ((len <= rstrm->fbtbc) && |
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| 381 | ((rstrm->in_finger + len) <= rstrm->in_boundry)) { |
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| 382 | buf = (int32_t *) rstrm->in_finger; |
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| 383 | rstrm->fbtbc -= len; |
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| 384 | rstrm->in_finger += len; |
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| 385 | } |
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| 386 | break; |
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| 387 | case XDR_FREE: /* to avoid warning */ |
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| 388 | break; |
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| 389 | } |
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| 390 | return (buf); |
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| 391 | } |
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| 392 | |
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| 393 | static void |
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| 394 | xdrrec_destroy(xdrs) |
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| 395 | register XDR *xdrs; |
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| 396 | { |
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| 397 | register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; |
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| 398 | |
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| 399 | mem_free(rstrm->the_buffer, |
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| 400 | rstrm->sendsize + rstrm->recvsize + BYTES_PER_XDR_UNIT); |
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| 401 | mem_free((caddr_t)rstrm, sizeof(RECSTREAM)); |
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| 402 | } |
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| 403 | |
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| 404 | |
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| 405 | /* |
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| 406 | * Exported routines to manage xdr records |
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| 407 | */ |
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| 408 | |
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| 409 | /* |
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| 410 | * Before reading (deserializing from the stream, one should always call |
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| 411 | * this procedure to guarantee proper record alignment. |
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| 412 | */ |
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| 413 | bool_t |
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| 414 | xdrrec_skiprecord(xdrs) |
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| 415 | XDR *xdrs; |
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| 416 | { |
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| 417 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 418 | |
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| 419 | while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) { |
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| 420 | if (! skip_input_bytes(rstrm, rstrm->fbtbc)) |
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| 421 | return (FALSE); |
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| 422 | rstrm->fbtbc = 0; |
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| 423 | if ((! rstrm->last_frag) && (! set_input_fragment(rstrm))) |
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| 424 | return (FALSE); |
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| 425 | } |
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| 426 | rstrm->last_frag = FALSE; |
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| 427 | return (TRUE); |
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| 428 | } |
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| 429 | |
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| 430 | /* |
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| 431 | * Look ahead fuction. |
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| 432 | * Returns TRUE iff there is no more input in the buffer |
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| 433 | * after consuming the rest of the current record. |
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| 434 | */ |
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| 435 | bool_t |
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| 436 | xdrrec_eof(xdrs) |
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| 437 | XDR *xdrs; |
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| 438 | { |
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| 439 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 440 | |
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| 441 | while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) { |
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| 442 | if (! skip_input_bytes(rstrm, rstrm->fbtbc)) |
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| 443 | return (TRUE); |
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| 444 | rstrm->fbtbc = 0; |
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| 445 | if ((! rstrm->last_frag) && (! set_input_fragment(rstrm))) |
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| 446 | return (TRUE); |
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| 447 | } |
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| 448 | if (rstrm->in_finger == rstrm->in_boundry) |
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| 449 | return (TRUE); |
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| 450 | return (FALSE); |
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| 451 | } |
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| 452 | |
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| 453 | /* |
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| 454 | * The client must tell the package when an end-of-record has occurred. |
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| 455 | * The second paraemters tells whether the record should be flushed to the |
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| 456 | * (output) tcp stream. (This let's the package support batched or |
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| 457 | * pipelined procedure calls.) TRUE => immmediate flush to tcp connection. |
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| 458 | */ |
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| 459 | bool_t |
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| 460 | xdrrec_endofrecord(xdrs, sendnow) |
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| 461 | XDR *xdrs; |
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| 462 | bool_t sendnow; |
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| 463 | { |
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| 464 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 465 | register u_long len; /* fragment length */ |
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| 466 | |
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| 467 | if (sendnow || rstrm->frag_sent || |
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| 468 | ((u_long)rstrm->out_finger + sizeof(u_int32_t) >= |
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| 469 | (u_long)rstrm->out_boundry)) { |
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| 470 | rstrm->frag_sent = FALSE; |
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| 471 | return (flush_out(rstrm, TRUE)); |
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| 472 | } |
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| 473 | len = (u_long)(rstrm->out_finger) - (u_long)(rstrm->frag_header) - |
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| 474 | sizeof(u_int32_t); |
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| 475 | *(rstrm->frag_header) = htonl((u_long)len | LAST_FRAG); |
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| 476 | rstrm->frag_header = (u_int32_t *)rstrm->out_finger; |
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| 477 | rstrm->out_finger += sizeof(u_int32_t); |
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| 478 | return (TRUE); |
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| 479 | } |
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| 480 | |
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| 481 | |
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| 482 | /* |
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| 483 | * Internal useful routines |
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| 484 | */ |
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| 485 | static bool_t |
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| 486 | flush_out(rstrm, eor) |
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| 487 | register RECSTREAM *rstrm; |
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| 488 | bool_t eor; |
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| 489 | { |
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| 490 | register u_long eormask = (eor == TRUE) ? LAST_FRAG : 0; |
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| 491 | register u_int32_t len = (u_long)(rstrm->out_finger) - |
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| 492 | (u_long)(rstrm->frag_header) - sizeof(u_int32_t); |
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| 493 | |
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| 494 | *(rstrm->frag_header) = htonl(len | eormask); |
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| 495 | len = (u_long)(rstrm->out_finger) - (u_long)(rstrm->out_base); |
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| 496 | if ((*(rstrm->writeit))(rstrm->tcp_handle, rstrm->out_base, (int)len) |
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| 497 | != (int)len) |
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| 498 | return (FALSE); |
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| 499 | rstrm->frag_header = (u_int32_t *)rstrm->out_base; |
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| 500 | rstrm->out_finger = (caddr_t)rstrm->out_base + sizeof(u_int32_t); |
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| 501 | return (TRUE); |
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| 502 | } |
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| 503 | |
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| 504 | static bool_t /* knows nothing about records! Only about input buffers */ |
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| 505 | fill_input_buf(rstrm) |
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| 506 | register RECSTREAM *rstrm; |
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| 507 | { |
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| 508 | register caddr_t where; |
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| 509 | u_long i; |
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| 510 | register long len; |
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| 511 | |
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| 512 | where = rstrm->in_base; |
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| 513 | i = (u_long)rstrm->in_boundry % BYTES_PER_XDR_UNIT; |
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| 514 | where += i; |
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| 515 | len = rstrm->in_size - i; |
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| 516 | if ((len = (*(rstrm->readit))(rstrm->tcp_handle, where, len)) == -1) |
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| 517 | return (FALSE); |
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| 518 | rstrm->in_finger = where; |
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| 519 | where += len; |
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| 520 | rstrm->in_boundry = where; |
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| 521 | return (TRUE); |
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| 522 | } |
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| 523 | |
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| 524 | static bool_t /* knows nothing about records! Only about input buffers */ |
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| 525 | get_input_bytes(rstrm, addr, len) |
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| 526 | register RECSTREAM *rstrm; |
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| 527 | register caddr_t addr; |
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| 528 | register int len; |
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| 529 | { |
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| 530 | register long current; |
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| 531 | |
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| 532 | while (len > 0) { |
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| 533 | current = (long)rstrm->in_boundry - (long)rstrm->in_finger; |
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| 534 | if (current == 0) { |
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| 535 | if (! fill_input_buf(rstrm)) |
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| 536 | return (FALSE); |
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| 537 | continue; |
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| 538 | } |
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| 539 | current = (len < current) ? len : current; |
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| 540 | memcpy(addr, rstrm->in_finger, current); |
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| 541 | rstrm->in_finger += current; |
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| 542 | addr += current; |
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| 543 | len -= current; |
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| 544 | } |
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| 545 | return (TRUE); |
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| 546 | } |
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| 547 | |
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| 548 | static bool_t /* next two bytes of the input stream are treated as a header */ |
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| 549 | set_input_fragment(rstrm) |
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| 550 | register RECSTREAM *rstrm; |
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| 551 | { |
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| 552 | u_int32_t header; |
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| 553 | |
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| 554 | if (! get_input_bytes(rstrm, (caddr_t)&header, sizeof(header))) |
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| 555 | return (FALSE); |
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| 556 | header = (long)ntohl(header); |
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| 557 | rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE; |
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| 558 | /* |
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| 559 | * Sanity check. Try not to accept wildly incorrect |
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| 560 | * record sizes. Unfortunately, the only record size |
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| 561 | * we can positively identify as being 'wildly incorrect' |
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| 562 | * is zero. Ridiculously large record sizes may look wrong, |
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| 563 | * but we don't have any way to be certain that they aren't |
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| 564 | * what the client actually intended to send us. |
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| 565 | */ |
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| 566 | if (header == 0) |
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| 567 | return(FALSE); |
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| 568 | rstrm->fbtbc = header & (~LAST_FRAG); |
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| 569 | return (TRUE); |
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| 570 | } |
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| 571 | |
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| 572 | static bool_t /* consumes input bytes; knows nothing about records! */ |
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| 573 | skip_input_bytes(rstrm, cnt) |
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| 574 | register RECSTREAM *rstrm; |
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| 575 | long cnt; |
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| 576 | { |
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| 577 | register long current; |
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| 578 | |
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| 579 | while (cnt > 0) { |
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| 580 | current = (long)rstrm->in_boundry - (long)rstrm->in_finger; |
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| 581 | if (current == 0) { |
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| 582 | if (! fill_input_buf(rstrm)) |
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| 583 | return (FALSE); |
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| 584 | continue; |
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| 585 | } |
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| 586 | current = (cnt < current) ? cnt : current; |
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| 587 | rstrm->in_finger += current; |
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| 588 | cnt -= current; |
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| 589 | } |
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| 590 | return (TRUE); |
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| 591 | } |
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| 592 | |
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| 593 | static u_int |
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| 594 | fix_buf_size(s) |
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| 595 | register u_int s; |
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| 596 | { |
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| 597 | |
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| 598 | if (s < 100) |
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| 599 | s = 4000; |
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| 600 | return (RNDUP(s)); |
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| 601 | } |
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