131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
/*
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* Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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#include "store-int.h"
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RCSID("$Id: store_emem.c,v 1.12 2002/04/18 14:00:34 joda Exp $");
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typedef struct emem_storage{
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unsigned char *base;
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size_t size;
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size_t len;
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unsigned char *ptr;
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}emem_storage;
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static ssize_t
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emem_fetch(krb5_storage *sp, void *data, size_t size)
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{
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emem_storage *s = (emem_storage*)sp->data;
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if(s->base + s->len - s->ptr < size)
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size = s->base + s->len - s->ptr;
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memmove(data, s->ptr, size);
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sp->seek(sp, size, SEEK_CUR);
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return size;
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}
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static ssize_t
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emem_store(krb5_storage *sp, const void *data, size_t size)
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{
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emem_storage *s = (emem_storage*)sp->data;
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if(size > s->base + s->size - s->ptr){
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void *base;
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size_t sz, off;
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sz = 2 * (size + (s->ptr - s->base)); /* XXX */
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off = s->ptr - s->base;
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base = realloc(s->base, sz);
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if(base == NULL)
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return 0;
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s->size = sz;
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s->base = base;
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s->ptr = (unsigned char*)base + off;
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}
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memmove(s->ptr, data, size);
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sp->seek(sp, size, SEEK_CUR);
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return size;
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}
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static off_t
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emem_seek(krb5_storage *sp, off_t offset, int whence)
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{
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emem_storage *s = (emem_storage*)sp->data;
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switch(whence){
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case SEEK_SET:
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if(offset > s->size)
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offset = s->size;
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if(offset < 0)
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offset = 0;
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s->ptr = s->base + offset;
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if(offset > s->len)
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s->len = offset;
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break;
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case SEEK_CUR:
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sp->seek(sp,s->ptr - s->base + offset, SEEK_SET);
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break;
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case SEEK_END:
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sp->seek(sp, s->len + offset, SEEK_SET);
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break;
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default:
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errno = EINVAL;
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return -1;
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}
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return s->ptr - s->base;
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}
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static void
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emem_free(krb5_storage *sp)
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{
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emem_storage *s = sp->data;
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memset(s->base, 0, s->len);
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free(s->base);
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}
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krb5_storage *
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krb5_storage_emem(void)
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{
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krb5_storage *sp = malloc(sizeof(krb5_storage));
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emem_storage *s = malloc(sizeof(*s));
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sp->data = s;
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sp->flags = 0;
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sp->eof_code = HEIM_ERR_EOF;
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s->size = 1024;
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s->base = malloc(s->size);
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s->len = 0;
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s->ptr = s->base;
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sp->fetch = emem_fetch;
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sp->store = emem_store;
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sp->seek = emem_seek;
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sp->free = emem_free;
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return sp;
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}
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