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#include <stdio.h>
#include <stdlib.h>
#include "sha256_mb.h"

#define TEST_LEN  (1024*1024)
#define TEST_BUFS 100
#ifndef RANDOMS
# define RANDOMS  10
#endif
#ifndef TEST_SEED
# define TEST_SEED 0x1234
#endif

#define UPDATE_SIZE		13*SHA256_BLOCK_SIZE
#define MAX_RAND_UPDATE_BLOCKS 	(TEST_LEN/(16*SHA256_BLOCK_SIZE))

#ifdef DEBUG
# define debug_char(x) putchar(x)
#else
# define debug_char(x) do {} while (0)
#endif

/* Reference digest global to reduce stack usage */
static uint32_t digest_ref[TEST_BUFS][SHA256_DIGEST_NWORDS];

extern void sha256_ref(uint8_t * input_data, uint32_t * digest, uint32_t len);

// Generates pseudo-random data

void rand_buffer(unsigned char *buf, const long buffer_size)
{
	long i;
	for (i = 0; i < buffer_size; i++)
		buf[i] = rand();
}

int main(void)
{
	SHA256_HASH_CTX_MGR *mgr = NULL;
	SHA256_HASH_CTX ctxpool[TEST_BUFS], *ctx = NULL;
	uint32_t i, j, fail = 0;
	int len_done, len_rem, len_rand;
	unsigned char *bufs[TEST_BUFS];
	unsigned char *buf_ptr[TEST_BUFS];
	uint32_t lens[TEST_BUFS];
	unsigned int joblen, jobs, t;

	printf("multibinary_sha256_update test, %d sets of %dx%d max: ", RANDOMS, TEST_BUFS,
	       TEST_LEN);

	srand(TEST_SEED);

	posix_memalign((void *)&mgr, 16, sizeof(SHA256_HASH_CTX_MGR));
	sha256_ctx_mgr_init(mgr);

	for (i = 0; i < TEST_BUFS; i++) {
		// Allocte and fill buffer
		bufs[i] = (unsigned char *)malloc(TEST_LEN);
		buf_ptr[i] = bufs[i];
		if (bufs[i] == NULL) {
			printf("malloc failed test aborted\n");
			return 1;
		}
		rand_buffer(bufs[i], TEST_LEN);

		// Init ctx contents
		hash_ctx_init(&ctxpool[i]);
		ctxpool[i].user_data = (void *)((uint64_t) i);

		// Run reference test
		sha256_ref(bufs[i], digest_ref[i], TEST_LEN);
	}

	// Run sb_sha256 tests
	for (i = 0; i < TEST_BUFS;) {
		len_done = (int)((unsigned long)buf_ptr[i] - (unsigned long)bufs[i]);
		len_rem = TEST_LEN - len_done;

		if (len_done == 0)
			ctx = sha256_ctx_mgr_submit(mgr,
						    &ctxpool[i],
						    buf_ptr[i], UPDATE_SIZE, HASH_FIRST);
		else if (len_rem <= UPDATE_SIZE)
			ctx = sha256_ctx_mgr_submit(mgr,
						    &ctxpool[i],
						    buf_ptr[i], len_rem, HASH_LAST);
		else
			ctx = sha256_ctx_mgr_submit(mgr,
						    &ctxpool[i],
						    buf_ptr[i], UPDATE_SIZE, HASH_UPDATE);

		// Add jobs while available or finished
		if ((ctx == NULL) || hash_ctx_complete(ctx)) {
			i++;
			continue;
		}
		// Resubmit unfinished job
		i = (unsigned long)(ctx->user_data);
		buf_ptr[i] += UPDATE_SIZE;
	}

	// Start flushing finished jobs, end on last flushed
	ctx = sha256_ctx_mgr_flush(mgr);
	while (ctx) {
		if (hash_ctx_complete(ctx)) {
			debug_char('-');
			ctx = sha256_ctx_mgr_flush(mgr);
			continue;
		}
		// Resubmit unfinished job
		i = (unsigned long)(ctx->user_data);
		buf_ptr[i] += UPDATE_SIZE;

		len_done = (int)((unsigned long)buf_ptr[i]
				 - (unsigned long)bufs[i]);
		len_rem = TEST_LEN - len_done;

		if (len_rem <= UPDATE_SIZE)
			ctx = sha256_ctx_mgr_submit(mgr,
						    &ctxpool[i],
						    buf_ptr[i], len_rem, HASH_LAST);
		else
			ctx = sha256_ctx_mgr_submit(mgr,
						    &ctxpool[i],
						    buf_ptr[i], UPDATE_SIZE, HASH_UPDATE);

		if (ctx == NULL)
			ctx = sha256_ctx_mgr_flush(mgr);
	}

	// Check digests
	for (i = 0; i < TEST_BUFS; i++) {
		for (j = 0; j < SHA256_DIGEST_NWORDS; j++) {
			if (ctxpool[i].job.result_digest[j] != digest_ref[i][j]) {
				fail++;
				printf("Test%d fixed size, digest%d fail %8X <=> %8X",
				       i, j, ctxpool[i].job.result_digest[j],
				       digest_ref[i][j]);
			}
		}
	}
	putchar('.');

	// Run tests with random size and number of jobs
	for (t = 0; t < RANDOMS; t++) {
		jobs = rand() % (TEST_BUFS);

		for (i = 0; i < jobs; i++) {
			joblen = rand() % (TEST_LEN);
			rand_buffer(bufs[i], joblen);
			lens[i] = joblen;
			buf_ptr[i] = bufs[i];
			sha256_ref(bufs[i], digest_ref[i], lens[i]);
		}

		sha256_ctx_mgr_init(mgr);

		// Run sha256_sb jobs
		i = 0;
		while (i < jobs) {
			// Submit a new job
			len_rand = SHA256_BLOCK_SIZE +
			    SHA256_BLOCK_SIZE * (rand() % MAX_RAND_UPDATE_BLOCKS);

			if (lens[i] > len_rand)
				ctx = sha256_ctx_mgr_submit(mgr,
							    &ctxpool[i],
							    buf_ptr[i], len_rand, HASH_FIRST);
			else
				ctx = sha256_ctx_mgr_submit(mgr,
							    &ctxpool[i],
							    buf_ptr[i], lens[i], HASH_ENTIRE);

			// Returned ctx could be:
			//  - null context (we are just getting started and lanes aren't full yet), or
			//  - finished already (an ENTIRE we submitted or a previous LAST is returned), or
			//  - an unfinished ctx, we will resubmit

			if ((ctx == NULL) || hash_ctx_complete(ctx)) {
				i++;
				continue;
			} else {
				// unfinished ctx returned, choose another random update length and submit either
				// UPDATE or LAST depending on the amount of buffer remaining
				while ((ctx != NULL) && !(hash_ctx_complete(ctx))) {
					j = (unsigned long)(ctx->user_data);	// Get index of the returned ctx
					buf_ptr[j] = bufs[j] + ctx->total_length;
					len_rand = (rand() % SHA256_BLOCK_SIZE)
					    * (rand() % MAX_RAND_UPDATE_BLOCKS);
					len_rem = lens[j] - ctx->total_length;

					if (len_rem <= len_rand)	// submit the rest of the job as LAST
						ctx = sha256_ctx_mgr_submit(mgr,
									    &ctxpool[j],
									    buf_ptr[j],
									    len_rem,
									    HASH_LAST);
					else	// submit the random update length as UPDATE
						ctx = sha256_ctx_mgr_submit(mgr,
									    &ctxpool[j],
									    buf_ptr[j],
									    len_rand,
									    HASH_UPDATE);
				}	// Either continue submitting any contexts returned here as UPDATE/LAST, or
				// go back to submitting new jobs using the index i.

				i++;
			}
		}

		// Start flushing finished jobs, end on last flushed
		ctx = sha256_ctx_mgr_flush(mgr);
		while (ctx) {
			if (hash_ctx_complete(ctx)) {
				debug_char('-');
				ctx = sha256_ctx_mgr_flush(mgr);
				continue;
			}
			// Resubmit unfinished job
			i = (unsigned long)(ctx->user_data);
			buf_ptr[i] = bufs[i] + ctx->total_length;	// update buffer pointer
			len_rem = lens[i] - ctx->total_length;
			len_rand = (rand() % SHA256_BLOCK_SIZE)
			    * (rand() % MAX_RAND_UPDATE_BLOCKS);
			debug_char('+');
			if (len_rem <= len_rand)
				ctx = sha256_ctx_mgr_submit(mgr,
							    &ctxpool[i],
							    buf_ptr[i], len_rem, HASH_LAST);
			else
				ctx = sha256_ctx_mgr_submit(mgr,
							    &ctxpool[i],
							    buf_ptr[i], len_rand, HASH_UPDATE);

			if (ctx == NULL)
				ctx = sha256_ctx_mgr_flush(mgr);
		}

		// Check result digest
		for (i = 0; i < jobs; i++) {
			for (j = 0; j < SHA256_DIGEST_NWORDS; j++) {
				if (ctxpool[i].job.result_digest[j] != digest_ref[i][j]) {
					fail++;
					printf("Test%d, digest%d fail %8X <=> %8X\n",
					       i, j, ctxpool[i].job.result_digest[j],
					       digest_ref[i][j]);
				}
			}
		}
		if (fail) {
			printf("Test failed function check %d\n", fail);
			return fail;
		}

		putchar('.');
		fflush(0);
	}			// random test t

	if (fail)
		printf("Test failed function check %d\n", fail);
	else
		printf(" multibinary_sha256_update rand: Pass\n");

	return fail;
}
