Function sum_update

checksum.c:622–679

Feed data into a hash digest accumulator. */

/* Feed data into a hash digest accumulator. */
void sum_update(const char *p, int32 len)
{
#ifdef USE_OPENSSL
	if (cur_sum_evp_md) {
		EVP_DigestUpdate(ctx_evp, (uchar *)p, len);
	} else
#endif
	switch (cur_sum_nni->num) {
#ifdef SUPPORT_XXHASH
	  case CSUM_XXH64:
		XXH64_update(xxh64_state, p, len);
		break;
#endif
#ifdef SUPPORT_XXH3
	  case CSUM_XXH3_64:
		XXH3_64bits_update(xxh3_state, p, len);
		break;
	  case CSUM_XXH3_128:
		XXH3_128bits_update(xxh3_state, p, len);
		break;
#endif
	  case CSUM_MD5:
		md5_update(&ctx_md, (uchar *)p, len);
		break;
	  case CSUM_MD4:
	  case CSUM_MD4_OLD:
	  case CSUM_MD4_BUSTED:
	  case CSUM_MD4_ARCHAIC:
		if (len + sumresidue < CSUM_CHUNK) {
			memcpy(ctx_md.buffer + sumresidue, p, len);
			sumresidue += len;
			break;
		}

		if (sumresidue) {
			int32 i = CSUM_CHUNK - sumresidue;
			memcpy(ctx_md.buffer + sumresidue, p, i);
			mdfour_update(&ctx_md, (uchar *)ctx_md.buffer, CSUM_CHUNK);
			len -= i;
			p += i;
		}

		while (len >= CSUM_CHUNK) {
			mdfour_update(&ctx_md, (uchar *)p, CSUM_CHUNK);
			len -= CSUM_CHUNK;
			p += CSUM_CHUNK;
		}

		sumresidue = len;
		if (sumresidue)
			memcpy(ctx_md.buffer, p, sumresidue);
		break;
	  case CSUM_NONE:
		break;
	  default: /* paranoia to prevent missing case values */
		exit_cleanup(RERR_UNSUPPORTED);
	}
}