test_compression.h

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/* Copyright (C) 2021 Wildfire Games.
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#include "lib/self_test.h"
 
#include "lib/self_test.h"
#include "lib/res/file/archive/compression.h"
 
#include <random>
 
class TestCompression : public CxxTest::TestSuite
{
public:
    void test_compress_decompress_compare()
    {
        // generate random input data
        // (limit values to 0..7 so that the data will actually be compressible)
        std::mt19937 engine(42);
        std::uniform_int_distribution<u8> distribution(0x00, 0x07);
        const size_t data_size = 10000;
        u8 data[data_size];
        for(size_t i = 0; i < data_size; i++)
            data[i] = distribution(engine);
 
        u8* cdata; size_t csize;
        u8 udata[data_size];
 
        // compress
        uintptr_t c = comp_alloc(CT_COMPRESSION, CM_DEFLATE);
        {
        TS_ASSERT(c != 0);
        const size_t csizeBound = comp_max_output_size(c, data_size);
        TS_ASSERT_OK(comp_alloc_output(c, csizeBound));
        const ssize_t cdata_produced = comp_feed(c, data, data_size);
        TS_ASSERT(cdata_produced >= 0);
        u32 checksum;
        TS_ASSERT_OK(comp_finish(c, &cdata, &csize, &checksum));
        TS_ASSERT(cdata_produced <= (ssize_t)csize);    // can't have produced more than total
        }
 
        // decompress
        uintptr_t d = comp_alloc(CT_DECOMPRESSION, CM_DEFLATE);
        {
        TS_ASSERT(d != 0);
        comp_set_output(d, udata, data_size);
        const ssize_t udata_produced = comp_feed(d, cdata, csize);
        TS_ASSERT(udata_produced >= 0);
        u8* udata_final; size_t usize_final; u32 checksum;
        TS_ASSERT_OK(comp_finish(d, &udata_final, &usize_final, &checksum));
        TS_ASSERT(udata_produced <= (ssize_t)usize_final);  // can't have produced more than total
        TS_ASSERT_EQUALS(udata_final, udata);   // output buffer address is same
        TS_ASSERT_EQUALS(usize_final, data_size);   // correct amount of output
        }
 
        comp_free(c);
        comp_free(d);
 
        // verify data survived intact
        TS_ASSERT_SAME_DATA(data, udata, data_size);
    }
};