2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.4 1995-05-15 11:56:09 quinn
8 * More work on memory management.
10 * Revision 1.3 1995/04/18 08:15:21 quinn
11 * Added dynamic memory allocation on encoding (whew). Code is now somewhat
12 * neater. We'll make the same change for decoding one day.
14 * Revision 1.2 1995/03/17 10:17:52 quinn
15 * Added memory management.
17 * Revision 1.1 1995/03/14 10:27:40 quinn
18 * Modified makefile to use common lib
19 * Beginning to add memory management to odr
27 /* ------------------------ NIBBLE MEMORY ---------------------- */
29 #define ODR_MEM_CHUNK (10*1024)
31 typedef struct odr_memblock
36 struct odr_memblock *next;
39 static odr_memblock *freelist = 0; /* global freelist */
41 static void free_block(odr_memblock *p)
48 * acquire a block with a minimum of size free bytes.
50 static odr_memblock *get_block(int size)
54 for (r = freelist, l = 0; r; l = r, r = r->next)
64 int get = ODR_MEM_CHUNK;
68 if (!(r = malloc(sizeof(*r))))
70 if (!(r->buf = malloc(r->size = get)))
78 * Return p to the global freelist.
80 void odr_release_mem(ODR_MEM p)
93 * Extract the memory control block from o.
95 ODR_MEM odr_extract_mem(ODR o)
103 void *odr_malloc(ODR o, int size)
105 struct odr_memblock *p = o->mem;
108 if (!p || p->size - p->top < size)
109 if (!(p = get_block(size)))
118 p->top += (size + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
122 /* ---------- memory management for data encoding ----------*/
125 int odr_grow_block(odr_ecblock *b, int min_bytes)
135 if (togrow < min_bytes)
137 if (b->size && !(b->buf = realloc(b->buf, b->size += togrow)))
139 else if (!b->size && !(b->buf = malloc(b->size = togrow)))
142 fprintf(stderr, "New size for encode_buffer: %d\n", b->size);
147 int odr_write(ODR o, unsigned char *buf, int bytes)
149 if (o->ecb.pos + bytes >= o->ecb.size && odr_grow_block(&o->ecb, bytes))
154 memcpy(o->ecb.buf + o->ecb.pos, buf, bytes);
156 if (o->ecb.pos > o->ecb.top)
157 o->ecb.top = o->ecb.pos;
161 int odr_seek(ODR o, int whence, int offset)
163 if (whence == ODR_S_CUR)
164 offset += o->ecb.pos;
165 else if (whence == ODR_S_END)
166 offset += o->ecb.top;
167 if (offset > o->ecb.size && odr_grow_block(&o->ecb, offset - o->ecb.size))