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unittest.c
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unittest.c
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/*
* unittest.c - unit tests for hcpak
*
* Copyright (C) 2008 Jussi Mäki <[email protected]>
*/
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include "util.h"
#include "heap.h"
#include "huffman.h"
#include "bitfile.h"
static u32 bits_to_integer(u8 *bits, int bit_count)
{
u32 out = 0;
u8 bit_pos = 0;
if (bit_count > 32) return -1;
while (bit_count > 0) {
if (bit_pos > 7) {
bits++;
bit_pos = 0;
}
/* set the rightmost bit */
out |= !!(*bits & (1 << (7-bit_pos)));
bit_pos++;
bit_count--;
/* shift the output left by one bit */
if (bit_count) out = out << 1;
}
return out;
}
void test_heap(void)
{
struct heap *h;
struct hcnode a, b, c, d, e;
struct hcnode *nodes[3];
d.frequency = 4;
e.frequency = 5;
b.frequency = 2;
c.frequency = 3;
a.frequency = 1;
nodes[0] = &a; nodes[1] = &b; nodes[2] = &c;
nodes[3] = &d; nodes[4] = &e;
h = heap_build(nodes, 5);
assert (1 == heap_extract_min(h)->frequency);
assert (2 == heap_extract_min(h)->frequency);
assert (3 == heap_extract_min(h)->frequency);
assert (4 == heap_extract_min(h)->frequency);
assert (5 == heap_extract_min(h)->frequency);
heap_free(h);
}
void test_huffman(void)
{
struct hcnode *root, *n;
/* This example is from CLRS */
u32 freqs[] = {5, 9, 12, 13, 16, 45};
int chars[] = {'f','e','c','b','d','a'};
u32 expect_codes[] = {0xc, 0xd, 0x4, 0x5, 0x7, 0x0};
int count = 6, i;
struct hcnode **nodes;
nodes = huffman_init(freqs, chars, 6);
root = huffman(nodes, 6);
huffman_make_codes(root);
for (i=0; i<count; i++) {
n = nodes[i];
/* printf("code for character %c (freq %d): %x (len %d) (expecting %x)\n", n->character, n->frequency, bits_to_integer(n->code, n->code_len), n->code_len, expect_codes[i]); */
assert(bits_to_integer(n->code, n->code_len) == expect_codes[i]);
}
}
void test_huffman2(void)
{
struct hcnode *root, *n;
unsigned int freqs[256];
int chars[256];
int count = 256, i;
struct hcnode **nodes;
for(i=0; i<count; i++) {
freqs[i] = i;
chars[i] = i;
}
nodes = huffman_init(freqs, chars, 256);
root = huffman(nodes, 256);
huffman_make_codes(root);
for (i=0; i<count; i++) {
n = nodes[i];
printf("code for character %d: 0x%x\n", n->character, bits_to_integer(n->code, n->code_len));
}
}
void test_bitfile(void)
{
struct bitfile *bf;
char buf[20] = {0,};
u8 res;
u32 res32;
int ret = 0;
bf = bitfile_open("bitfile.test", "w");
assert (bf != NULL);
bitfile_put_bytes(bf, (u8*)"HCPAK", 5);
bitfile_put_byte(bf, 'a');
bitfile_put_byte(bf, 'b');
bitfile_put_byte(bf, 'c');
bitfile_put_byte(bf, 'd');
bitfile_put_bit(bf, 0);
bitfile_put_bit(bf, 0);
bitfile_put_bit(bf, 1);
bitfile_put_bit(bf, 1);
bitfile_put_byte(bf, 'e');
bitfile_put_byte(bf, 'f');
bitfile_put_u32(bf, (u32)123456);
res = 0xff;
bitfile_put_bits(bf, &res, 5);
bitfile_put_bit(bf, 1);
bitfile_put_bit(bf, 0);
bitfile_put_bit(bf, 1);
bitfile_put_bit(bf, 0);
/* bitfile_put_byte(bf, 'f'); */
bitfile_close(bf);
bf = bitfile_open("bitfile.test", "r");
assert (bf != NULL);
bitfile_get_bytes(bf, (u8*)buf, 5);
buf[5] = '\0';
assert(!memcmp(buf, "HCPAK", 5));
/* printf("HCPAK: '%s'\n", buf); */
ret += bitfile_get_byte(bf, &res); /* printf("a: %c\n", res); */ assert(res == 'a');
ret += bitfile_get_byte(bf, &res); /* printf("b: %c\n", res); */ assert(res == 'b');
ret += bitfile_get_byte(bf, &res); /* printf("c: %c\n", res); */ assert(res == 'c');
ret += bitfile_get_byte(bf, &res); /* printf("d: %c\n", res); */ assert(res == 'd');
ret += bitfile_get_bit(bf, &res); /* printf("0: %d\n", res); */ assert(res == 0);
ret += bitfile_get_bit(bf, &res); /* printf("0: %d\n", res); */ assert(res == 0);
ret += bitfile_get_bit(bf, &res); /* printf("1: %d\n", res); */ assert(res == 1);
ret += bitfile_get_bit(bf, &res); /* printf("1: %d\n", res); */ assert(res == 1);
ret += bitfile_get_byte(bf, &res); /* printf("e: %c\n", res); */ assert(res == 'e');
ret += bitfile_get_byte(bf, &res); /* printf("f: %c\n", res); */ assert(res == 'f');
ret += bitfile_get_u32(bf, &res32);
assert (res32 == 123456);
ret += bitfile_get_bit(bf, &res); /* printf("1: %d\n", res); */ assert(res == 1);
ret += bitfile_get_bit(bf, &res); /* printf("1: %d\n", res); */ assert(res == 1);
ret += bitfile_get_bit(bf, &res); /* printf("1: %d\n", res); */ assert(res == 1);
ret += bitfile_get_bit(bf, &res); /* printf("1: %d\n", res); */ assert(res == 1);
ret += bitfile_get_bit(bf, &res); /* printf("1: %d\n", res); */ assert(res == 1);
ret += bitfile_get_bit(bf, &res); /* printf("1: %d\n", res); */ assert(res == 1);
ret += bitfile_get_bit(bf, &res); /* printf("0: %d\n", res); */ assert(res == 0);
ret += bitfile_get_bit(bf, &res); /* printf("1: %d\n", res); */ assert(res == 1);
ret += bitfile_get_bit(bf, &res); /* printf("0: %d\n", res); */ assert(res == 0);
assert(ret == 0);
/* try reading past the EOF */
assert(bitfile_get_byte(bf, &res) != 0);
/* try rewinding the file */
bitfile_rewind(bf);
bitfile_get_bytes(bf, (u8*)buf, 5);
buf[5] = '\0';
assert(!memcmp(buf, "HCPAK", 5));
/* printf("HCPAK: '%s'\n", buf); */
bitfile_close(bf);
}
void test_bitfile2(void)
{
struct bitfile *bf = bitfile_open("/dev/urandom", "r");
int i;
u8 res;
int sum = 0;
for(i=0; i<1000000; i++) {
bitfile_get_bit(bf, &res);
sum += res;
}
printf("the sum of first million bits from urandom: %d\n", sum);
bitfile_rewind(bf);
sum = 0;
for(i=0; i<1000000; i++) {
bitfile_get_bit(bf, &res);
sum += res;
}
printf("(again) the sum first million bits from urandom: %d\n", sum);
bitfile_close(bf);
}
void test_bitfile3(void)
{
u8 byte;
u32 word;
struct bitfile *bf = bitfile_open("/tmp/test", "r");
struct bitfile *bf2 = bitfile_open("/tmp/test.out", "w");
struct bitfile *bf3 = bitfile_open("/tmp/test.out2", "w");
struct bitfile *bf4 = bitfile_open("/tmp/test.out3", "w");
struct bitfile *bf5 = bitfile_open("/tmp/test.out4", "w");
while(bitfile_get_byte(bf, &byte) == 0) {
bitfile_put_byte(bf2, byte);
}
bitfile_rewind(bf);
while(bitfile_get_bit(bf, &byte) == 0) {
bitfile_put_bit(bf3, byte);
}
bitfile_rewind(bf);
while(bitfile_get_u32(bf, &word) == 0) {
bitfile_put_u32(bf4, word);
}
bitfile_rewind(bf);
{
u8 bytes[2];
u8 bits[4];
while(bitfile_get_byte(bf, &bytes[0]) == 0 &&
bitfile_get_byte(bf, &bytes[1]) == 0 &&
bitfile_get_bit(bf, &bits[0]) == 0 &&
bitfile_get_bit(bf, &bits[1]) == 0 &&
bitfile_get_bit(bf, &bits[2]) == 0 &&
bitfile_get_bit(bf, &bits[3]) == 0) {
u8 out = bits[0] << 7 | bits[1] << 6 |
bits[2] << 5 | bits[3] << 4;
u8 foo[3];
foo[0] = bytes[0];
foo[1] = bytes[1];
foo[2] = out;
bitfile_put_bits(bf5, (u8 *)&foo, 20);
/* bitfile_put_bit(bf5, bits[0]); */
/* bitfile_put_bit(bf5, bits[1]); */
/* bitfile_put_bit(bf5, bits[2]); */
/* bitfile_put_bit(bf5, bits[3]); */
}
}
bitfile_close(bf);
bitfile_close(bf2);
bitfile_close(bf3);
bitfile_close(bf4);
bitfile_close(bf5);
}
void test_bitfile4(void)
{
u8 foo = 170;
/* u8 foo2; */
/* u8 foo3[2] = {85, 85}; */
struct bitfile *bf = bitfile_open("/tmp/bf-test", "w");
bitfile_put_bit(bf, 0);
bitfile_put_bit(bf, 0);
bitfile_put_bit(bf, 0);
bitfile_put_bit(bf, 0);
bitfile_put_bit(bf, 0);
bitfile_put_byte(bf, foo);
bitfile_put_bit(bf, 1);
bitfile_put_bit(bf, 1);
bitfile_put_bit(bf, 1);
/* bitfile_put_bit(bf, 0); */
/* bitfile_put_bit(bf, 1); */
/* bitfile_put_bit(bf, 0); */
/* bitfile_put_bit(bf, 1); */
/* bitfile_put_bit(bf, 0); */
/* bitfile_put_bit(bf, 1); */
/* bitfile_put_bit(bf, 0); */
/* bitfile_put_bit(bf, 1); */
/* bitfile_put_bit(bf, 0); */
/* bitfile_put_bit(bf, 0); */
/* foo2 = foo << 4; */
/* bitfile_put_bits(bf, &foo, 4); */
/* bitfile_put_bits(bf, &foo2, 4); */
/* bitfile_put_bits(bf, &foo3, 10); */
/* bitfile_put_bits(bf, &foo3, 6); */
bitfile_close(bf);
}
int main(void)
{
test_heap();
test_huffman();
test_bitfile();
/* These are manual tests: */
/* test_huffman2(); */
/* test_bitfile2(); */
/* test_bitfile3(); */
test_bitfile4();
printf("Tests passed.\n");
return 0;
}