2 * Copyright (C) 1994, Index Data I/S
4 * Sebastian Hammer, Adam Dickmeiss
7 * Revision 1.3 1995-04-18 08:15:21 quinn
8 * Added dynamic memory allocation on encoding (whew). Code is now somewhat
9 * neater. We'll make the same change for decoding one day.
11 * Revision 1.2 1995/03/17 10:17:52 quinn
12 * Added memory management.
14 * Revision 1.1 1995/03/14 10:27:40 quinn
15 * Modified makefile to use common lib
16 * Beginning to add memory management to odr
23 /* ------------------------ NIBBLE MEMORY ---------------------- */
25 #define ODR_MEM_CHUNK (10*1024)
27 typedef struct odr_memblock
32 struct odr_memblock *next;
35 static odr_memblock *freelist = 0;
37 static void free_block(odr_memblock *p)
43 static odr_memblock *get_block(int size)
47 for (r = freelist, l = 0; r; l = r, r = r->next)
57 int get = ODR_MEM_CHUNK;
61 if (!(r = malloc(sizeof(*r))))
63 if (!(r->buf = malloc(r->size = get)))
70 void odr_release_mem(odr_memblock *p)
82 void *odr_malloc(ODR o, int size)
84 struct odr_memblock *p = o->mem;
87 if (!p || p->size - p->top < size)
88 if (!(p = get_block(size)))
99 p->top += (size + (sizeof(long) - 1)) & ~(sizeof(long) - 1);
103 /* ---------- memory management for data encoding ----------*/
106 int odr_grow_block(odr_ecblock *b, int min_bytes)
116 if (togrow < min_bytes)
118 if (b->size && !(b->buf = realloc(b->buf, b->size += togrow)))
120 else if (!b->size && !(b->buf = malloc(b->size = togrow)))
123 fprintf(stderr, "New size for encode_buffer: %d\n", b->size);
128 int odr_write(ODR o, unsigned char *buf, int bytes)
130 if (o->ecb.pos + bytes >= o->ecb.size && odr_grow_block(&o->ecb, bytes))
135 memcpy(o->ecb.buf + o->ecb.pos, buf, bytes);
137 if (o->ecb.pos > o->ecb.top)
138 o->ecb.top = o->ecb.pos;
142 int odr_seek(ODR o, int whence, int offset)
144 if (whence == ODR_S_CUR)
145 offset += o->ecb.pos;
146 else if (whence == ODR_S_END)
147 offset += o->ecb.top;
148 if (offset > o->ecb.size && odr_grow_block(&o->ecb, offset - o->ecb.size))