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/*
* bstream.c
*
* This file contains all functions needed to use bstreams.
*/
#define FAIM_INTERNAL
#include <aim.h>
faim_internal int aim_bstream_init(aim_bstream_t *bs, fu8_t *data, int len)
{
if (!bs)
return -1;
bs->data = data;
bs->len = len;
bs->offset = 0;
return 0;
}
faim_internal int aim_bstream_empty(aim_bstream_t *bs)
{
return bs->len - bs->offset;
}
faim_internal int aim_bstream_curpos(aim_bstream_t *bs)
{
return bs->offset;
}
faim_internal int aim_bstream_setpos(aim_bstream_t *bs, int off)
{
if (off > bs->len)
return -1;
bs->offset = off;
return off;
}
faim_internal void aim_bstream_rewind(aim_bstream_t *bs)
{
aim_bstream_setpos(bs, 0);
return;
}
faim_internal int aim_bstream_advance(aim_bstream_t *bs, int n)
{
if (aim_bstream_empty(bs) < n)
return 0; /* XXX throw an exception */
bs->offset += n;
return n;
}
faim_internal fu8_t aimbs_get8(aim_bstream_t *bs)
{
if (aim_bstream_empty(bs) < 1)
return 0; /* XXX throw an exception */
bs->offset++;
return aimutil_get8(bs->data + bs->offset - 1);
}
faim_internal fu16_t aimbs_get16(aim_bstream_t *bs)
{
if (aim_bstream_empty(bs) < 2)
return 0; /* XXX throw an exception */
bs->offset += 2;
return aimutil_get16(bs->data + bs->offset - 2);
}
faim_internal fu32_t aimbs_get32(aim_bstream_t *bs)
{
if (aim_bstream_empty(bs) < 4)
return 0; /* XXX throw an exception */
bs->offset += 4;
return aimutil_get32(bs->data + bs->offset - 4);
}
faim_internal fu8_t aimbs_getle8(aim_bstream_t *bs)
{
if (aim_bstream_empty(bs) < 1)
return 0; /* XXX throw an exception */
bs->offset++;
return aimutil_getle8(bs->data + bs->offset - 1);
}
faim_internal fu16_t aimbs_getle16(aim_bstream_t *bs)
{
if (aim_bstream_empty(bs) < 2)
return 0; /* XXX throw an exception */
bs->offset += 2;
return aimutil_getle16(bs->data + bs->offset - 2);
}
faim_internal fu32_t aimbs_getle32(aim_bstream_t *bs)
{
if (aim_bstream_empty(bs) < 4)
return 0; /* XXX throw an exception */
bs->offset += 4;
return aimutil_getle32(bs->data + bs->offset - 4);
}
faim_internal int aimbs_put8(aim_bstream_t *bs, fu8_t v)
{
if (aim_bstream_empty(bs) < 1)
return 0; /* XXX throw an exception */
bs->offset += aimutil_put8(bs->data + bs->offset, v);
return 1;
}
faim_internal int aimbs_put16(aim_bstream_t *bs, fu16_t v)
{
if (aim_bstream_empty(bs) < 2)
return 0; /* XXX throw an exception */
bs->offset += aimutil_put16(bs->data + bs->offset, v);
return 2;
}
faim_internal int aimbs_put32(aim_bstream_t *bs, fu32_t v)
{
if (aim_bstream_empty(bs) < 4)
return 0; /* XXX throw an exception */
bs->offset += aimutil_put32(bs->data + bs->offset, v);
return 1;
}
faim_internal int aimbs_putle8(aim_bstream_t *bs, fu8_t v)
{
if (aim_bstream_empty(bs) < 1)
return 0; /* XXX throw an exception */
bs->offset += aimutil_putle8(bs->data + bs->offset, v);
return 1;
}
faim_internal int aimbs_putle16(aim_bstream_t *bs, fu16_t v)
{
if (aim_bstream_empty(bs) < 2)
return 0; /* XXX throw an exception */
bs->offset += aimutil_putle16(bs->data + bs->offset, v);
return 2;
}
faim_internal int aimbs_putle32(aim_bstream_t *bs, fu32_t v)
{
if (aim_bstream_empty(bs) < 4)
return 0; /* XXX throw an exception */
bs->offset += aimutil_putle32(bs->data + bs->offset, v);
return 1;
}
faim_internal int aimbs_getrawbuf(aim_bstream_t *bs, fu8_t *buf, int len)
{
if (aim_bstream_empty(bs) < len)
return 0;
memcpy(buf, bs->data + bs->offset, len);
bs->offset += len;
return len;
}
faim_internal fu8_t *aimbs_getraw(aim_bstream_t *bs, int len)
{
fu8_t *ob;
if (!(ob = malloc(len)))
return NULL;
if (aimbs_getrawbuf(bs, ob, len) < len) {
free(ob);
return NULL;
}
return ob;
}
faim_internal char *aimbs_getstr(aim_bstream_t *bs, int len)
{
char *ob;
if (!(ob = malloc(len+1)))
return NULL;
if (aimbs_getrawbuf(bs, ob, len) < len) {
free(ob);
return NULL;
}
ob[len] = '\0';
return ob;
}
faim_internal int aimbs_putraw(aim_bstream_t *bs, const fu8_t *v, int len)
{
if (aim_bstream_empty(bs) < len)
return 0; /* XXX throw an exception */
memcpy(bs->data + bs->offset, v, len);
bs->offset += len;
return len;
}
faim_internal int aimbs_putbs(aim_bstream_t *bs, aim_bstream_t *srcbs, int len)
{
if (aim_bstream_empty(srcbs) < len)
return 0; /* XXX throw exception (underrun) */
if (aim_bstream_empty(bs) < len)
return 0; /* XXX throw exception (overflow) */
memcpy(bs->data + bs->offset, srcbs->data + srcbs->offset, len);
bs->offset += len;
srcbs->offset += len;
return len;
}
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