2 * Copyright (c) 1995, Index Data
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.5 1995-05-16 08:50:55 quinn
8 * License, documentation, and memory fixes
10 * Revision 1.4 1995/05/15 11:56:09 quinn
11 * More work on memory management.
13 * Revision 1.3 1995/04/18 08:15:21 quinn
14 * Added dynamic memory allocation on encoding (whew). Code is now somewhat
15 * neater. We'll make the same change for decoding one day.
17 * Revision 1.2 1995/03/17 10:17:52 quinn
18 * Added memory management.
20 * Revision 1.1 1995/03/14 10:27:40 quinn
21 * Modified makefile to use common lib
22 * Beginning to add memory management to odr
30 /* ------------------------ NIBBLE MEMORY ---------------------- */
32 #define ODR_MEM_CHUNK (10*1024)
34 typedef struct odr_memblock
39 struct odr_memblock *next;
42 static odr_memblock *freelist = 0; /* global freelist */
44 static void free_block(odr_memblock *p)
51 * acquire a block with a minimum of size free bytes.
53 static odr_memblock *get_block(int size)
57 for (r = freelist, l = 0; r; l = r, r = r->next)
67 int get = ODR_MEM_CHUNK;
71 if (!(r = malloc(sizeof(*r))))
73 if (!(r->buf = malloc(r->size = get)))
81 * Return p to the global freelist.
83 void odr_release_mem(ODR_MEM p)
96 * Extract the memory control block from o.
98 ODR_MEM odr_extract_mem(ODR o)
106 void *odr_malloc(ODR o, int size)
108 struct odr_memblock *p = o->mem;
111 if (!p || p->size - p->top < size)
112 if (!(p = get_block(size)))
121 p->top += (size + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
125 /* ---------- memory management for data encoding ----------*/
128 int odr_grow_block(odr_ecblock *b, int min_bytes)
138 if (togrow < min_bytes)
140 if (b->size && !(b->buf = realloc(b->buf, b->size += togrow)))
142 else if (!b->size && !(b->buf = malloc(b->size = togrow)))
145 fprintf(stderr, "New size for encode_buffer: %d\n", b->size);
150 int odr_write(ODR o, unsigned char *buf, int bytes)
152 if (o->ecb.pos + bytes >= o->ecb.size && odr_grow_block(&o->ecb, bytes))
157 memcpy(o->ecb.buf + o->ecb.pos, buf, bytes);
159 if (o->ecb.pos > o->ecb.top)
160 o->ecb.top = o->ecb.pos;
164 int odr_seek(ODR o, int whence, int offset)
166 if (whence == ODR_S_CUR)
167 offset += o->ecb.pos;
168 else if (whence == ODR_S_END)
169 offset += o->ecb.top;
170 if (offset > o->ecb.size && odr_grow_block(&o->ecb, offset - o->ecb.size))