source: libfaim/bstream.c @ 54b4a87

/*
 * 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;
}