6dd7ff76fb
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1378 ec53bebd-3082-4978-b11e-865c3cabbd6b
85 lines
1.7 KiB
C
85 lines
1.7 KiB
C
#include "krb5_locl.h"
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RCSID("$Id$");
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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 size_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 size_t
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emem_store(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(size > s->base + s->size - s->ptr){
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s->size = 2 * (size + (s->ptr - s->base)); /* XXX */
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s->base = realloc(s->base, s->size);
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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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free(((emem_storage*)sp->data)->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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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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