2 * Copyright (c) 1995, Index Data
3 * See the file LICENSE for details.
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.10 1995-10-25 16:58:19 quinn
8 * Stupid bug in odr_malloc
10 * Revision 1.9 1995/10/13 16:08:08 quinn
13 * Revision 1.8 1995/09/29 17:12:24 quinn
16 * Revision 1.7 1995/09/27 15:02:59 quinn
17 * Modified function heads & prototypes.
19 * Revision 1.6 1995/08/21 09:10:41 quinn
20 * Smallish fixes to suppport new formats.
22 * Revision 1.5 1995/05/16 08:50:55 quinn
23 * License, documentation, and memory fixes
25 * Revision 1.4 1995/05/15 11:56:09 quinn
26 * More work on memory management.
28 * Revision 1.3 1995/04/18 08:15:21 quinn
29 * Added dynamic memory allocation on encoding (whew). Code is now somewhat
30 * neater. We'll make the same change for decoding one day.
32 * Revision 1.2 1995/03/17 10:17:52 quinn
33 * Added memory management.
35 * Revision 1.1 1995/03/14 10:27:40 quinn
36 * Modified makefile to use common lib
37 * Beginning to add memory management to odr
45 /* ------------------------ NIBBLE MEMORY ---------------------- */
47 #define ODR_MEM_CHUNK (10*1024)
49 typedef struct odr_memblock
55 struct odr_memblock *next;
58 static odr_memblock *freelist = 0; /* global freelist */
60 static void free_block(odr_memblock *p)
67 * acquire a block with a minimum of size free bytes.
69 static odr_memblock *get_block(int size)
73 for (r = freelist, l = 0; r; l = r, r = r->next)
83 int get = ODR_MEM_CHUNK;
87 if (!(r = malloc(sizeof(*r))))
89 if (!(r->buf = malloc(r->size = get)))
98 * Return p to the global freelist.
100 void odr_release_mem(ODR_MEM p)
113 * Extract the memory control block from o.
115 ODR_MEM odr_extract_mem(ODR o)
123 void *odr_malloc(ODR o, int size)
125 struct odr_memblock *p;
130 if (!(r = malloc(size)))
135 if (!p || p->size - p->top < size)
136 if (!(p = get_block(size)))
141 p->total = o->mem->total;
147 p->top += (size + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
154 return o->mem ? o->mem->total : 0;
157 /* ---------- memory management for data encoding ----------*/
160 int odr_grow_block(odr_ecblock *b, int min_bytes)
170 if (togrow < min_bytes)
172 if (b->size && !(b->buf = realloc(b->buf, b->size += togrow)))
174 else if (!b->size && !(b->buf = malloc(b->size = togrow)))
177 fprintf(stderr, "New size for encode_buffer: %d\n", b->size);
182 int odr_write(ODR o, unsigned char *buf, int bytes)
184 if (o->ecb.pos + bytes >= o->ecb.size && odr_grow_block(&o->ecb, bytes))
189 memcpy(o->ecb.buf + o->ecb.pos, buf, bytes);
191 if (o->ecb.pos > o->ecb.top)
192 o->ecb.top = o->ecb.pos;
196 int odr_seek(ODR o, int whence, int offset)
198 if (whence == ODR_S_CUR)
199 offset += o->ecb.pos;
200 else if (whence == ODR_S_END)
201 offset += o->ecb.top;
202 if (offset > o->ecb.size && odr_grow_block(&o->ecb, offset - o->ecb.size))