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Annotation of driverkit/tests/netbuf.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: /*
        !            25:  * netbuf.m - netbuf stub for testing NetDriver objects.
        !            26:  *
        !            27:  * HISTORY
        !            28:  * 24-Jul-91    Doug Mitchell at NeXT
        !            29:  *      Created. 
        !            30:  */
        !            31: 
        !            32: /*
        !            33:  * Hmmm...we need KERNEL defined to get netif.h...
        !            34:  */
        !            35: #import <bsd/sys/socket.h>             
        !            36: #define KERNEL 1
        !            37: #import <net/netif.h>
        !            38: #undef KERNEL
        !            39: #import <driverkit/generalFuncs.h>
        !            40: #import <libc.h>
        !            41: 
        !            42: /*
        !            43:  * Our private mbuf equivalent.
        !            44:  */
        !            45: typedef struct {
        !            46:        void            *start_data;            // starting DMA data at
        !            47:                                                // nb_alloc time
        !            48:        int             start_length;           // starting size at 
        !            49:                                                // nb_alloc time
        !            50:        void            *data;                  // current DMA data
        !            51:        int             length;                 // amount of data in *data
        !            52:        void            (*free_fcn)(void *);    // "free" function
        !            53:        void            *free_arg;              // "free argument
        !            54: } stub_netbuf_t;
        !            55: 
        !            56: /*
        !            57:  * Private functions.
        !            58:  */
        !            59: static stub_netbuf_t *stub_netbuf_alloc();
        !            60: static void stub_netbuf_free(stub_netbuf_t *snb);
        !            61: 
        !            62: 
        !            63: char *nb_map(netbuf_t nb)
        !            64: {
        !            65:        stub_netbuf_t *snb = (stub_netbuf_t *)nb;
        !            66: 
        !            67:        return (char *)snb->data;
        !            68: }
        !            69: 
        !            70: /*
        !            71:  * Alloc some data as well as a stub_netbuf_t.
        !            72:  */
        !            73: netbuf_t nb_alloc(unsigned size)
        !            74: {
        !            75:        char *data;
        !            76:        stub_netbuf_t *snb;
        !            77: 
        !            78:        data = IOMalloc(size);
        !            79:        snb = stub_netbuf_alloc();
        !            80:        snb->data = snb->start_data = data;
        !            81:        snb->length = snb->start_length = size;
        !            82:        snb->free_fcn = NULL;
        !            83:        return (netbuf_t)snb;
        !            84: }
        !            85: 
        !            86: netbuf_t nb_alloc_wrapper(void *data, 
        !            87:        unsigned size,
        !            88:        void freefunc(void *), void *freefunc_arg)
        !            89: {
        !            90:        stub_netbuf_t *snb;
        !            91: 
        !            92:        snb = stub_netbuf_alloc();
        !            93:        snb->data = snb->start_data = data;
        !            94:        snb->length = snb->start_length = size;
        !            95:        snb->free_fcn = freefunc;
        !            96:        snb->free_arg = freefunc_arg;
        !            97:        return (netbuf_t)snb;
        !            98: }
        !            99: 
        !           100: void nb_free(netbuf_t nb)
        !           101: {
        !           102:        stub_netbuf_t *snb = (stub_netbuf_t *)nb;
        !           103:        
        !           104:        /*
        !           105:         * First free the data, whether we allocated it or the driver did.
        !           106:         */
        !           107:        if(snb->free_fcn) {
        !           108:                (*snb->free_fcn)(snb->free_arg);
        !           109:        }
        !           110:        else {
        !           111:                IOFree(snb->data, snb->length);
        !           112:        }
        !           113:        
        !           114:        /*
        !           115:         * now free the wrapper.
        !           116:         */
        !           117:        stub_netbuf_free(snb);
        !           118: }
        !           119: 
        !           120: void nb_free_wrapper(netbuf_t nb)
        !           121: {
        !           122:        stub_netbuf_t *snb = (stub_netbuf_t *)nb;
        !           123: 
        !           124:        stub_netbuf_free(snb);
        !           125: }
        !           126: 
        !           127: unsigned nb_size(netbuf_t nb)
        !           128: {
        !           129:        stub_netbuf_t *snb = (stub_netbuf_t *)nb;
        !           130:        
        !           131:        return (unsigned)snb->length;
        !           132: }
        !           133: 
        !           134: int nb_shrink_top(netbuf_t nb, unsigned size)
        !           135: {
        !           136:        stub_netbuf_t *snb = (stub_netbuf_t *)nb;
        !           137:        
        !           138:        if((snb->length - (int)size) < 0) {
        !           139:                IOLog("Illegal nb_shrink_top\n");
        !           140:                return -1;
        !           141:        }
        !           142:        snb->length -= size;
        !           143:        snb->data   += size;
        !           144:        return 0;
        !           145: }
        !           146: 
        !           147: int
        !           148: nb_grow_top(netbuf_t nb, unsigned size)
        !           149: {
        !           150:        stub_netbuf_t *snb = (stub_netbuf_t *)nb;
        !           151:        
        !           152:        if(((char *)snb->data - size) < (char *)snb->start_data) {
        !           153:                IOLog("Illegal nb_grow_top (buf underflow)\n");
        !           154:                return -1;
        !           155:        }
        !           156:        if((snb->length + size) > snb->start_length) {
        !           157:                IOLog("Illegal nb_grow_top (buf overflow)\n");
        !           158:                return -1;
        !           159:        }
        !           160:        snb->length += size;
        !           161:        snb->data   -= size;
        !           162:        return 0;
        !           163: }
        !           164: 
        !           165: int
        !           166: nb_shrink_bot(netbuf_t nb, unsigned size)
        !           167: {
        !           168:        stub_netbuf_t *snb = (stub_netbuf_t *)nb;
        !           169:        
        !           170:        if((snb->length - (int)size) < 0) {
        !           171:                IOLog("Illegal nb_shrink_bot\n");
        !           172:                return -1;
        !           173:        }
        !           174:        snb->length -= size;
        !           175:        return 0;
        !           176: }
        !           177: 
        !           178: 
        !           179: int
        !           180: nb_grow_bot(netbuf_t nb, unsigned size)
        !           181: {
        !           182:        stub_netbuf_t *snb = (stub_netbuf_t *)nb;
        !           183:        
        !           184:        if((snb->length + size) > snb->start_length) {
        !           185:                IOLog("Illegal nb_grow_bot (buf overflow)\n");
        !           186:                return -1;
        !           187:        }
        !           188:        snb->length += size;
        !           189:        return 0;
        !           190: }
        !           191: 
        !           192: /*
        !           193:  * Private functions.
        !           194:  */
        !           195: static stub_netbuf_t *stub_netbuf_alloc()
        !           196: {
        !           197:        stub_netbuf_t *snb;
        !           198:        
        !           199:        snb = (stub_netbuf_t *)IOMalloc(sizeof(*snb));
        !           200:        bzero(snb, sizeof(*snb));
        !           201:        return snb;
        !           202: }
        !           203: 
        !           204: static void stub_netbuf_free(stub_netbuf_t *snb)
        !           205: {
        !           206:        IOFree(snb, sizeof(*snb));
        !           207: }

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