/*
- * Copyright (C) 1994, Index Data I/S
- * All rights reserved.
+ * Copyright (c) 1995, Index Data
+ * See the file LICENSE for details.
* Sebastian Hammer, Adam Dickmeiss
*
* $Log: odr_mem.c,v $
- * Revision 1.1 1995-03-14 10:27:40 quinn
+ * Revision 1.5 1995-05-16 08:50:55 quinn
+ * License, documentation, and memory fixes
+ *
+ * Revision 1.4 1995/05/15 11:56:09 quinn
+ * More work on memory management.
+ *
+ * Revision 1.3 1995/04/18 08:15:21 quinn
+ * Added dynamic memory allocation on encoding (whew). Code is now somewhat
+ * neater. We'll make the same change for decoding one day.
+ *
+ * Revision 1.2 1995/03/17 10:17:52 quinn
+ * Added memory management.
+ *
+ * Revision 1.1 1995/03/14 10:27:40 quinn
* Modified makefile to use common lib
* Beginning to add memory management to odr
*
- *
*/
#include <stdlib.h>
-
#include <odr.h>
+#include <dmalloc.h>
+
+/* ------------------------ NIBBLE MEMORY ---------------------- */
+
+#define ODR_MEM_CHUNK (10*1024)
+
+typedef struct odr_memblock
+{
+ char *buf;
+ int size;
+ int top;
+ struct odr_memblock *next;
+} odr_memblock;
+
+static odr_memblock *freelist = 0; /* global freelist */
+
+static void free_block(odr_memblock *p)
+{
+ p->next = freelist;
+ freelist = p;
+}
+
+/*
+ * acquire a block with a minimum of size free bytes.
+ */
+static odr_memblock *get_block(int size)
+{
+ odr_memblock *r, *l;
+
+ for (r = freelist, l = 0; r; l = r, r = r->next)
+ if (r->size >= size)
+ break;
+ if (r)
+ if (l)
+ l->next = r->next;
+ else
+ freelist = r->next;
+ else
+ {
+ int get = ODR_MEM_CHUNK;
+
+ if (get < size)
+ get = size;
+ if (!(r = malloc(sizeof(*r))))
+ abort();
+ if (!(r->buf = malloc(r->size = get)))
+ abort();
+ }
+ r->top = 0;
+ return r;
+}
+
+/*
+ * Return p to the global freelist.
+ */
+void odr_release_mem(ODR_MEM p)
+{
+ odr_memblock *t;
+
+ while (p)
+ {
+ t = p;
+ p = p->next;
+ free_block(t);
+ }
+}
+
+/*
+ * Extract the memory control block from o.
+ */
+ODR_MEM odr_extract_mem(ODR o)
+{
+ ODR_MEM r = o->mem;
+
+ o->mem = 0;
+ return r;
+}
+
+void *odr_malloc(ODR o, int size)
+{
+ struct odr_memblock *p = o->mem;
+ char *r;
+
+ if (!p || p->size - p->top < size)
+ if (!(p = get_block(size)))
+ abort();
+ else
+ {
+ p->next = o->mem;
+ o->mem = p;
+ }
+ r = p->buf + p->top;
+ /* align size */
+ p->top += (size + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
+ return r;
+}
+
+/* ---------- memory management for data encoding ----------*/
+
+
+int odr_grow_block(odr_ecblock *b, int min_bytes)
+{
+ int togrow;
+
+ if (!b->can_grow)
+ return -1;
+ if (!b->size)
+ togrow = 1024;
+ else
+ togrow = b->size;
+ if (togrow < min_bytes)
+ togrow = min_bytes;
+ if (b->size && !(b->buf = realloc(b->buf, b->size += togrow)))
+ abort();
+ else if (!b->size && !(b->buf = malloc(b->size = togrow)))
+ abort();
+#ifdef ODR_DEBUG
+ fprintf(stderr, "New size for encode_buffer: %d\n", b->size);
+#endif
+ return 0;
+}
+
+int odr_write(ODR o, unsigned char *buf, int bytes)
+{
+ if (o->ecb.pos + bytes >= o->ecb.size && odr_grow_block(&o->ecb, bytes))
+ {
+ o->error = OSPACE;
+ return -1;
+ }
+ memcpy(o->ecb.buf + o->ecb.pos, buf, bytes);
+ o->ecb.pos += bytes;
+ if (o->ecb.pos > o->ecb.top)
+ o->ecb.top = o->ecb.pos;
+ return 0;
+}
-char *odr_malloc(ODR o, int size)
+int odr_seek(ODR o, int whence, int offset)
{
- return malloc(size); /* REPLACE WITH NIBBLE MALLOC!! */
+ if (whence == ODR_S_CUR)
+ offset += o->ecb.pos;
+ else if (whence == ODR_S_END)
+ offset += o->ecb.top;
+ if (offset > o->ecb.size && odr_grow_block(&o->ecb, offset - o->ecb.size))
+ {
+ o->error = OSPACE;
+ return -1;
+ }
+ o->ecb.pos = offset;
+ return 0;
}