#include <r_util.h>

/* dex/dwarf uleb128 implementation */

R_API const ut8 *r_uleb128 (const ut8 *data, ut64 *v) {
	ut8 c;
	ut64 s, sum;
	for (s = sum = 0; ; s += 7) {
		c = *(data++) & 0xff;
		sum |= ((ut32) (c&0x7f) << s);
		if (!(c&0x80)) break;
	}
	if (v) *v = sum;
	return data;
}

R_API const ut8 *r_leb128 (const ut8 *data, st64 *v) {
	ut8 c;
	st64 s, sum;
	for (s = sum = 0;;) {
		c = *(data++) & 0x0ff;
		sum |= ((st64) (c & 0x7f) << s);
		s += 7;
		if (!(c & 0x80)) break;
	}
	if ((s < (8 * sizeof (sum))) && (c & 0x40)) {
		sum |= -(1 << s);
	}
	if (v) *v = sum;
	return data;
}

#if 0
main() {
	ut32 n;
	ut8 *buf = "\x10\x02\x90\x88";
	r_uleb128 (buf, &n);
	printf ("n = %d\n", n);
}
#endif