r8302: import mini HEIMDAL into the tree

(This used to be commit 118be28a7aef233799956615a99d1a2a74dac175)

1 files changed, 132 insertions, 0 deletions

diff --git a/source4/heimdal/lib/krb5/store_emem.c b/source4/heimdal/lib/krb5/store_emem.c
new file mode 100644
index 0000000000..b9f93728de
--- /dev/null
+++ b/source4/heimdal/lib/krb5/store_emem.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ */
+
+#include "krb5_locl.h"
+#include "store-int.h"
+
+RCSID("$Id: store_emem.c,v 1.14 2004/05/25 21:43:29 lha Exp $");
+
+typedef struct emem_storage{
+    unsigned char *base;
+    size_t size;
+    size_t len;
+    unsigned char *ptr;
+}emem_storage;
+
+static ssize_t
+emem_fetch(krb5_storage *sp, void *data, size_t size)
+{
+    emem_storage *s = (emem_storage*)sp->data;
+    if(s->base + s->len - s->ptr < size)
+	size = s->base + s->len - s->ptr;
+    memmove(data, s->ptr, size);
+    sp->seek(sp, size, SEEK_CUR);
+    return size;
+}
+
+static ssize_t
+emem_store(krb5_storage *sp, const void *data, size_t size)
+{
+    emem_storage *s = (emem_storage*)sp->data;
+    if(size > s->base + s->size - s->ptr){
+	void *base;
+	size_t sz, off;
+	off = s->ptr - s->base;
+	sz = off + size;
+	if (sz < 4096)
+	    sz *= 2;
+	base = realloc(s->base, sz);
+	if(base == NULL)
+	    return 0;
+	s->size = sz;
+	s->base = base;
+	s->ptr = (unsigned char*)base + off;
+    }
+    memmove(s->ptr, data, size);
+    sp->seek(sp, size, SEEK_CUR);
+    return size;
+}
+
+static off_t
+emem_seek(krb5_storage *sp, off_t offset, int whence)
+{
+    emem_storage *s = (emem_storage*)sp->data;
+    switch(whence){
+    case SEEK_SET:
+	if(offset > s->size)
+	    offset = s->size;
+	if(offset < 0)
+	    offset = 0;
+	s->ptr = s->base + offset;
+	if(offset > s->len)
+	    s->len = offset;
+	break;
+    case SEEK_CUR:
+	sp->seek(sp,s->ptr - s->base + offset, SEEK_SET);
+	break;
+    case SEEK_END:
+	sp->seek(sp, s->len + offset, SEEK_SET);
+	break;
+    default:
+	errno = EINVAL;
+	return -1;
+    }
+    return s->ptr - s->base;
+}
+
+static void
+emem_free(krb5_storage *sp)
+{
+    emem_storage *s = sp->data;
+    memset(s->base, 0, s->len);
+    free(s->base);
+}
+
+krb5_storage * KRB5_LIB_FUNCTION
+krb5_storage_emem(void)
+{
+    krb5_storage *sp = malloc(sizeof(krb5_storage));
+    emem_storage *s = malloc(sizeof(*s));
+    sp->data = s;
+    sp->flags = 0;
+    sp->eof_code = HEIM_ERR_EOF;
+    s->size = 1024;
+    s->base = malloc(s->size);
+    s->len = 0;
+    s->ptr = s->base;
+    sp->fetch = emem_fetch;
+    sp->store = emem_store;
+    sp->seek = emem_seek;
+    sp->free = emem_free;
+    return sp;
+}