#include <string.h>

#include "base32.h"

	char b32hash[53];
	memset(b32hash, 0, 53);

		for (i = 0; i < BLAKE3_BYTES; i++)
			printf("%02x", hash->bytes[i]);
		printf("\n");

		base32_encode_hash(b32hash, hash->bytes);
		printf("%s\n", b32hash);
		/* for (i = 0; i < BLAKE3_BYTES; i++) */
		/* 	printf("%02x", hash->bytes[i]); */
		/* printf("\n"); */

void base32_encode_hash(char *dst, uint8_t const *in);

/**
 * Base32 encoding/decoding - for now only supports presenting blake3 hashes (32
 * bytes).
 */

 * (4) does not validate the 33rd byte to be a "1" meaning blake3.

static const char BASE32_ENC[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567=";
/**
 * Base32 encoding for hashes. This routine only handles (and assumes) inputs of
 * length 32. Additionally, it doesn't do any padding.
 *
 * The output should large enough to hold 53 character. One interesting feature
 * of Pijul's use of base32 is that the hash type is appended to the output as
 * an extra byte where 1 = BLAKE3. This is the reason that all blake3-hashed
 * change files end with "C".
 */
void
base32_encode_hash(char *dst, uint8_t const *hash)
{
	uint8_t b[5];
	int i, j;
	for (i = 0; i < 6; i++) {
		for (j = 0; j < 5; j++)
			b[j] = hash[i * 5 + j];
		*dst++ = BASE32_ENC[b[0] >> 3];
		*dst++ = BASE32_ENC[(b[0] & 0x7) << 2 | (b[1] & 0xc0) >> 6];
		*dst++ = BASE32_ENC[(b[1] & 0x3e) >> 1];
		*dst++ = BASE32_ENC[(b[1] & 0x1) << 4 | (b[2] & 0xf0) >> 4];
		*dst++ = BASE32_ENC[(b[2] & 0x0f) << 1 | (b[3] & 0x80) >> 7];
		*dst++ = BASE32_ENC[(b[3] & 0x7c) >> 2];
		*dst++ = BASE32_ENC[(b[3] & 0x3) << 3 | (b[4] & 0xe0) >> 5];
		*dst++ = BASE32_ENC[b[4] & 0x1f];
	}
	b[0] = hash[30];
	b[1] = hash[31];
	b[2] = 1; /* Blake3 */
	b[3] = b[4] = 0;
	*dst++ = BASE32_ENC[b[0] >> 3];
	*dst++ = BASE32_ENC[(b[0] & 0x7) << 2 | (b[1] & 0xc0) >> 6];
	*dst++ = BASE32_ENC[(b[1] & 0x3e) >> 1];
	*dst++ = BASE32_ENC[(b[1] & 0x1) << 4 | (b[2] & 0xf0) >> 4];
	*dst++ = BASE32_ENC[(b[2] & 0x0f) << 1 | (b[3] & 0x80) >> 7];
}