/*------------------------------------------------------------------------------
 *
 * Copyright (c) 2011-2025, EURid vzw. All rights reserved.
 * The YADIFA TM software product is provided under the BSD 3-clause license:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *        * Redistributions of source code must retain the above copyright
 *          notice, this list of conditions and the following disclaimer.
 *        * Redistributions in binary form must reproduce the above copyright
 *          notice, this list of conditions and the following disclaimer in the
 *          documentation and/or other materials provided with the distribution.
 *        * Neither the name of EURid nor the names of its contributors may be
 *          used to endorse or promote products derived from this software
 *          without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 *----------------------------------------------------------------------------*/

/**-----------------------------------------------------------------------------
 * @defgroup test
 * @ingroup test
 * @brief skeleton file
 *----------------------------------------------------------------------------*/

/*------------------------------------------------------------------------------
 *
 * skeleton test program, will not be installed with a "make install"
 *
 * To create a new test based on the skeleton:
 *
 * _ copy the folder
 * _ replace "skeleton" by the name of the test
 * _ add the test to the top level Makefile.am and configure.ac
 *
 *----------------------------------------------------------------------------*/

#include <dnscore/dnscore.h>
#include <dnscore/random.h>
#include <dnscore/digest.h>
#include <dnscore/zalloc.h>
#include <dnscore/format.h>

#include <dnscore/bytearray_input_stream.h>
#include <dnscore/buffer_input_stream.h>

#include <dnscore/bytearray_output_stream.h>
#include <dnscore/buffer_output_stream.h>

// read by various amounts of length
// read fully by various amounts of length

static random_ctx_t rndctx;

static uint8_t     *logger_channel_file_t;
static uint8_t     *file_tmp;
static size_t       file_size;
static uint8_t      file_digest[20];

#define MOSTLY_PRIMES_COUNT 1008

static int mostly_primes[MOSTLY_PRIMES_COUNT] = {
    4096, 4096, 4095, 1,    4095, 4097, 4097, 4095,

    2,    3,    5,    7,    11,   13,   17,   19,   23,   29,   31,   37,   41,   43,   47,   53,   59,   61,   67,   71,   73,   79,   83,   89,   97,   101,  103,  107,  109,  113,  127,  131,  137,  139,  149,  151,  157,  163,  167,
    173,  179,  181,  191,  193,  197,  199,  211,  223,  227,  229,  233,  239,  241,  251,  257,  263,  269,  271,  277,  281,  283,  293,  307,  311,  313,  317,  331,  337,  347,  349,  353,  359,  367,  373,  379,  383,  389,  397,
    401,  409,  419,  421,  431,  433,  439,  443,  449,  457,  461,  463,  467,  479,  487,  491,  499,  503,  509,  521,  523,  541,  547,  557,  563,  569,  571,  577,  587,  593,  599,  601,  607,  613,  617,  619,  631,  641,  643,
    647,  653,  659,  661,  673,  677,  683,  691,  701,  709,  719,  727,  733,  739,  743,  751,  757,  761,  769,  773,  787,  797,  809,  811,  821,  823,  827,  829,  839,  853,  857,  859,  863,  877,  881,  883,  887,  907,  911,
    919,  929,  937,  941,  947,  953,  967,  971,  977,  983,  991,  997,  1009, 1013, 1019, 1021, 1031, 1033, 1039, 1049, 1051, 1061, 1063, 1069, 1087, 1091, 1093, 1097, 1103, 1109, 1117, 1123, 1129, 1151, 1153, 1163, 1171, 1181, 1187,
    1193, 1201, 1213, 1217, 1223, 1229, 1231, 1237, 1249, 1259, 1277, 1279, 1283, 1289, 1291, 1297, 1301, 1303, 1307, 1319, 1321, 1327, 1361, 1367, 1373, 1381, 1399, 1409, 1423, 1427, 1429, 1433, 1439, 1447, 1451, 1453, 1459, 1471, 1481,
    1483, 1487, 1489, 1493, 1499, 1511, 1523, 1531, 1543, 1549, 1553, 1559, 1567, 1571, 1579, 1583, 1597, 1601, 1607, 1609, 1613, 1619, 1621, 1627, 1637, 1657, 1663, 1667, 1669, 1693, 1697, 1699, 1709, 1721, 1723, 1733, 1741, 1747, 1753,
    1759, 1777, 1783, 1787, 1789, 1801, 1811, 1823, 1831, 1847, 1861, 1867, 1871, 1873, 1877, 1879, 1889, 1901, 1907, 1913, 1931, 1933, 1949, 1951, 1973, 1979, 1987, 1993, 1997, 1999, 2003, 2011, 2017, 2027, 2029, 2039, 2053, 2063, 2069,
    2081, 2083, 2087, 2089, 2099, 2111, 2113, 2129, 2131, 2137, 2141, 2143, 2153, 2161, 2179, 2203, 2207, 2213, 2221, 2237, 2239, 2243, 2251, 2267, 2269, 2273, 2281, 2287, 2293, 2297, 2309, 2311, 2333, 2339, 2341, 2347, 2351, 2357, 2371,
    2377, 2381, 2383, 2389, 2393, 2399, 2411, 2417, 2423, 2437, 2441, 2447, 2459, 2467, 2473, 2477, 2503, 2521, 2531, 2539, 2543, 2549, 2551, 2557, 2579, 2591, 2593, 2609, 2617, 2621, 2633, 2647, 2657, 2659, 2663, 2671, 2677, 2683, 2687,
    2689, 2693, 2699, 2707, 2711, 2713, 2719, 2729, 2731, 2741, 2749, 2753, 2767, 2777, 2789, 2791, 2797, 2801, 2803, 2819, 2833, 2837, 2843, 2851, 2857, 2861, 2879, 2887, 2897, 2903, 2909, 2917, 2927, 2939, 2953, 2957, 2963, 2969, 2971,
    2999, 3001, 3011, 3019, 3023, 3037, 3041, 3049, 3061, 3067, 3079, 3083, 3089, 3109, 3119, 3121, 3137, 3163, 3167, 3169, 3181, 3187, 3191, 3203, 3209, 3217, 3221, 3229, 3251, 3253, 3257, 3259, 3271, 3299, 3301, 3307, 3313, 3319, 3323,
    3329, 3331, 3343, 3347, 3359, 3361, 3371, 3373, 3389, 3391, 3407, 3413, 3433, 3449, 3457, 3461, 3463, 3467, 3469, 3491, 3499, 3511, 3517, 3527, 3529, 3533, 3539, 3541, 3547, 3557, 3559, 3571, 3581, 3583, 3593, 3607, 3613, 3617, 3623,
    3631, 3637, 3643, 3659, 3671, 3673, 3677, 3691, 3697, 3701, 3709, 3719, 3727, 3733, 3739, 3761, 3767, 3769, 3779, 3793, 3797, 3803, 3821, 3823, 3833, 3847, 3851, 3853, 3863, 3877, 3881, 3889, 3907, 3911, 3917, 3919, 3923, 3929, 3931,
    3943, 3947, 3967, 3989, 4001, 4003, 4007, 4013, 4019, 4021, 4027, 4049, 4051, 4057, 4073, 4079, 4091, 4093, 4099, 4111, 4127, 4129, 4133, 4139, 4153, 4157, 4159, 4177, 4201, 4211, 4217, 4219, 4229, 4231, 4241, 4243, 4253, 4259, 4261,
    4271, 4273, 4283, 4289, 4297, 4327, 4337, 4339, 4349, 4357, 4363, 4373, 4391, 4397, 4409, 4421, 4423, 4441, 4447, 4451, 4457, 4463, 4481, 4483, 4493, 4507, 4513, 4517, 4519, 4523, 4547, 4549, 4561, 4567, 4583, 4591, 4597, 4603, 4621,
    4637, 4639, 4643, 4649, 4651, 4657, 4663, 4673, 4679, 4691, 4703, 4721, 4723, 4729, 4733, 4751, 4759, 4783, 4787, 4789, 4793, 4799, 4801, 4813, 4817, 4831, 4861, 4871, 4877, 4889, 4903, 4909, 4919, 4931, 4933, 4937, 4943, 4951, 4957,
    4967, 4969, 4973, 4987, 4993, 4999, 5003, 5009, 5011, 5021, 5023, 5039, 5051, 5059, 5077, 5081, 5087, 5099, 5101, 5107, 5113, 5119, 5147, 5153, 5167, 5171, 5179, 5189, 5197, 5209, 5227, 5231, 5233, 5237, 5261, 5273, 5279, 5281, 5297,
    5303, 5309, 5323, 5333, 5347, 5351, 5381, 5387, 5393, 5399, 5407, 5413, 5417, 5419, 5431, 5437, 5441, 5443, 5449, 5471, 5477, 5479, 5483, 5501, 5503, 5507, 5519, 5521, 5527, 5531, 5557, 5563, 5569, 5573, 5581, 5591, 5623, 5639, 5641,
    5647, 5651, 5653, 5657, 5659, 5669, 5683, 5689, 5693, 5701, 5711, 5717, 5737, 5741, 5743, 5749, 5779, 5783, 5791, 5801, 5807, 5813, 5821, 5827, 5839, 5843, 5849, 5851, 5857, 5861, 5867, 5869, 5879, 5881, 5897, 5903, 5923, 5927, 5939,
    5953, 5981, 5987, 6007, 6011, 6029, 6037, 6043, 6047, 6053, 6067, 6073, 6079, 6089, 6091, 6101, 6113, 6121, 6131, 6133, 6143, 6151, 6163, 6173, 6197, 6199, 6203, 6211, 6217, 6221, 6229, 6247, 6257, 6263, 6269, 6271, 6277, 6287, 6299,
    6301, 6311, 6317, 6323, 6329, 6337, 6343, 6353, 6359, 6361, 6367, 6373, 6379, 6389, 6397, 6421, 6427, 6449, 6451, 6469, 6473, 6481, 6491, 6521, 6529, 6547, 6551, 6553, 6563, 6569, 6571, 6577, 6581, 6599, 6607, 6619, 6637, 6653, 6659,
    6661, 6673, 6679, 6689, 6691, 6701, 6703, 6709, 6719, 6733, 6737, 6761, 6763, 6779, 6781, 6791, 6793, 6803, 6823, 6827, 6829, 6833, 6841, 6857, 6863, 6869, 6871, 6883, 6899, 6907, 6911, 6917, 6947, 6949, 6959, 6961, 6967, 6971, 6977,
    6983, 6991, 6997, 7001, 7013, 7019, 7027, 7039, 7043, 7057, 7069, 7079, 7103, 7109, 7121, 7127, 7129, 7151, 7159, 7177, 7187, 7193, 7207, 7211, 7213, 7219, 7229, 7237, 7243, 7247, 7253, 7283, 7297, 7307, 7309, 7321, 7331, 7333, 7349,
    7351, 7369, 7393, 7411, 7417, 7433, 7451, 7457, 7459, 7477, 7481, 7487, 7489, 7499, 7507, 7517, 7523, 7529, 7537, 7541, 7547, 7549, 7559, 7561, 7573, 7577, 7583, 7589, 7591, 7603, 7607, 7621, 7639, 7643, 7649, 7669, 7673, 7681, 7687,
    7691, 7699, 7703, 7717, 7723, 7727, 7741, 7753, 7757, 7759, 7789, 7793, 7817, 7823, 7829, 7841, 7853, 7867, 7873, 7877, 7879, 7883, 7901, 7907, 7919};

static void sha1(const void *buffer, size_t size, void *digest, size_t digest_size)
{
    digest_t ctx;
    digest_sha1_init(&ctx);
    digest_update(&ctx, buffer, size);
    digest_final_copy_bytes(&ctx, digest, digest_size);
}

static ya_result sha1_match(const void *buffer, size_t size)
{
    uint8_t digest[20];

    sha1(buffer, size, digest, sizeof(digest));

    if(memcmp(digest, file_digest, sizeof(file_digest)) == 0)
    {
        return SUCCESS;
    }
    else
    {
        const uint8_t *bytes = (const uint8_t *)buffer;
        for(size_t i = 0; i < file_size; ++i)
        {
            if(logger_channel_file_t[i] != bytes[i])
            {
                formatln("sha1_match: error at position %i/%i (%02x != %02x)", i, file_size, logger_channel_file_t[i], bytes[i]);

                size_t from = (i >= 32) ? i - 32 : 0;
                size_t to = MIN(i + 32, file_size);

                formatln("sha1_match: expected:");
                osprint_dump(termout, &logger_channel_file_t[from], to - from, 32, OSPRINT_DUMP_ALL);
                formatln("\nsha1_match: got:");
                osprint_dump(termout, &bytes[from], to - from, 32, OSPRINT_DUMP_ALL);
                println("");

                break;
            }
        }
        return ERROR;
    }
}

struct broken_input_stream_data
{
    input_stream_t filtered;
    size_t         offset;
};

typedef struct broken_input_stream_data broken_input_stream_data;

static ya_result                        broken_input_stream_read(input_stream_t *is, void *buffer_, uint32_t len)
{
    broken_input_stream_data *data = (broken_input_stream_data *)is->data;
    uint8_t                  *buffer = (uint8_t *)buffer_;
    ya_result                 ret;

    if((data->offset & 1) != 0)
    {
        uint32_t low_len = data->offset % len;
        if(low_len == 0)
        {
            low_len = 1;
        }

        len = low_len;
    }

    ret = input_stream_read(&data->filtered, buffer, len);

    if(ISOK(ret))
    {
        data->offset += ret;
    }

    return ret;
}

static ya_result broken_input_stream_skip(input_stream_t *is, uint32_t len)
{
    broken_input_stream_data *data = (broken_input_stream_data *)is->data;
    ya_result                 ret;

    if((data->offset & 1) == 0)
    {
        ret = input_stream_skip(&data->filtered, len);

        if(ISOK(ret))
        {
            data->offset += ret;
        }

        return ret;
    }
    else
    {
        return -1;
    }
}

static void broken_input_stream_close(input_stream_t *is)
{
    broken_input_stream_data *data = (broken_input_stream_data *)is->data;
    input_stream_close(&data->filtered);
    ZFREE_OBJECT(data);
    is->data = NULL;
    is->vtbl = NULL;
}

static const input_stream_vtbl broken_input_stream_vtbl = {
    broken_input_stream_read,
    broken_input_stream_skip,
    broken_input_stream_close,
    "broken_input_stream",
};

void broken_input_stream_init(input_stream_t *is, input_stream_t *filtered)
{
    broken_input_stream_data *data;
    ZALLOC_OBJECT_OR_DIE(data, broken_input_stream_data, GENERIC_TAG);
    data->filtered = *filtered;
    data->offset = 0;
    is->data = data;
    is->vtbl = &broken_input_stream_vtbl;
}

struct broken_output_stream_data
{
    output_stream_t filtered;
    size_t          offset;
};

typedef struct broken_output_stream_data broken_output_stream_data;

static ya_result                         broken_output_stream_write(output_stream_t *os, const uint8_t *buffer, uint32_t len)
{
    broken_output_stream_data *data = (broken_output_stream_data *)os->data;

    ya_result                  ret;

    if((data->offset & 1) != 0)
    {
        uint32_t low_len = data->offset % len;
        if(low_len == 0)
        {
            low_len = 1;
        }

        len = low_len;
    }

    ret = output_stream_write(&data->filtered, buffer, len);

    if(ISOK(ret))
    {
        data->offset += ret;
    }

    return len;
}

static ya_result broken_output_stream_flush(output_stream_t *os)
{
    broken_output_stream_data *data = (broken_output_stream_data *)os->data;

    output_stream_flush(&data->filtered);
    return SUCCESS;
}

static void broken_output_stream_close(output_stream_t *os)
{
    broken_output_stream_data *data = (broken_output_stream_data *)os->data;

    output_stream_close(&data->filtered);
    ZFREE_OBJECT(data);
    os->data = NULL;
    os->vtbl = NULL;
}

static const output_stream_vtbl broken_output_stream_vtbl = {
    broken_output_stream_write,
    broken_output_stream_flush,
    broken_output_stream_close,
    "broken_output_stream",
};

void broken_output_stream_init(output_stream_t *os, output_stream_t *filtered)
{
    broken_output_stream_data *data;
    ZALLOC_OBJECT_OR_DIE(data, broken_output_stream_data, GENERIC_TAG);
    data->filtered = *filtered;
    data->offset = 0;
    os->data = data;
    os->vtbl = &broken_output_stream_vtbl;
}

static ya_result test_input_read(input_stream_t *is, const char *prefix)
{
    ya_result ret = input_stream_read(is, file_tmp, file_size);

    if(FAIL(ret))
    {
        formatln("%s: test_input_read: failure: %r", prefix, ret);
        return ret;
    }

    if((size_t)ret != file_size)
    {
        formatln("%s: test_input_read: short read: %i instead of %i", prefix, ret, file_size);
        return ERROR;
    }

    input_stream_close(is);

    if(ISOK(ret = sha1_match(file_tmp, ret)))
    {
        formatln("%s: test_input_read: digest SUCCESS", prefix);
    }
    else
    {
        formatln("%s: test_input_read: digest FAILURE", prefix);
    }

    return ret;
}

static ya_result test_input_readfully(input_stream_t *is, const char *prefix)
{
    ya_result ret = input_stream_read_fully(is, file_tmp, file_size);

    if(FAIL(ret))
    {
        formatln("%s: test_input_readfully: failure: %r", prefix, ret);
        return ret;
    }

    if((size_t)ret != file_size)
    {
        formatln("%s: test_input_readfully: short readfully: %i instead of %i", prefix, ret, file_size);
        return ERROR;
    }

    input_stream_close(is);

    if(ISOK(ret = sha1_match(file_tmp, ret)))
    {
        formatln("%s: test_input_readfully: digest SUCCESS", prefix);
    }
    else
    {
        formatln("%s: test_input_readfully: digest FAILURE", prefix);
    }

    return ret;
}

static ya_result test_input_readfully_by_bits(input_stream_t *is, const char *prefix)
{
    ya_result ret = SUCCESS;
    int32_t   remaining = file_size;
    size_t    offset = 0;
    int       index = 0;

    while(remaining > 0)
    {
        int32_t chunk = mostly_primes[index++ % MOSTLY_PRIMES_COUNT];
        if(chunk > remaining)
        {
            chunk = remaining;
        }

        remaining -= chunk;

        ret = input_stream_read_fully(is, &file_tmp[offset], chunk);

        if(FAIL(ret))
        {
            formatln("%s: test_input_readfully_by_bits: failure trying to read %i bytes (position %i): %r", prefix, chunk, offset, ret);
            return ret;
        }

        if(ret != chunk)
        {
            formatln("%s: test_input_readfully_by_bits: short read: %i instead of %i", prefix, ret, chunk);
            ret = ERROR;
            return ret;
        }

        offset += chunk;
    }

    input_stream_close(is);

    if(ISOK(ret = sha1_match(file_tmp, file_size)))
    {
        formatln("%s: test_input_readfully_by_bits: digest SUCCESS", prefix);
    }
    else
    {
        formatln("%s: test_input_readfully_by_bits: digest FAILURE", prefix);
        ret = ERROR;
    }

    return ret;
}

struct is_constructor
{
    ya_result (*init)(input_stream_t *is);
    const char *name;
};

static ya_result init_bytearray_input_stream_init_const(input_stream_t *is)
{
    bytearray_input_stream_init_const(is, logger_channel_file_t, file_size);
    return SUCCESS;
}

static ya_result init_bytearray_input_stream_init_notowned(input_stream_t *is)
{
    bytearray_input_stream_init(is, logger_channel_file_t, file_size, false);
    return SUCCESS;
}

static ya_result init_buffer_input_stream_4k_init(input_stream_t *is)
{
    bytearray_input_stream_init_const(is, logger_channel_file_t, file_size);
    buffer_input_stream_init(is, is, 4096);
    return SUCCESS;
}

static ya_result init_buffer_input_stream_1b_init(input_stream_t *is)
{
    bytearray_input_stream_init_const(is, logger_channel_file_t, file_size);
    buffer_input_stream_init(is, is, 1);
    return SUCCESS;
}

static ya_result init_buffer_input_stream_4k_broken_init(input_stream_t *is)
{
    bytearray_input_stream_init_const(is, logger_channel_file_t, file_size);
    broken_input_stream_init(is, is);
    buffer_input_stream_init(is, is, 4096);
    return SUCCESS;
}

static ya_result init_buffer_input_stream_1b_broken_init(input_stream_t *is)
{
    bytearray_input_stream_init_const(is, logger_channel_file_t, file_size);
    broken_input_stream_init(is, is);
    buffer_input_stream_init(is, is, 1);
    return SUCCESS;
}

struct is_constructor is_constructors[] = {{init_bytearray_input_stream_init_const, "bytearray_input_stream_init_const"},
                                           {init_bytearray_input_stream_init_notowned, "bytearray_input_stream_init(notowned)"},
                                           {init_buffer_input_stream_4k_init, "buffer_input_stream_4k_init"},
                                           {init_buffer_input_stream_1b_init, "buffer_input_stream_1b_init"},
                                           {init_buffer_input_stream_4k_broken_init, "buffer_input_stream_4k_broken_init"},
                                           {init_buffer_input_stream_1b_broken_init, "buffer_input_stream_1b_broken_init"},
                                           {NULL, NULL}};

struct os_constructor
{
    ya_result (*init)(output_stream_t *is);
    const char *name;
};

static ya_result init_bytearray_output_stream_init_const(output_stream_t *os)
{
    bytearray_output_stream_init(os, file_tmp, file_size);
    return SUCCESS;
}

static ya_result init_bytearray_output_stream_init_notowned(output_stream_t *os)
{
    bytearray_output_stream_init(os, file_tmp, file_size);
    return SUCCESS;
}

static ya_result init_buffer_output_stream_4k_init(output_stream_t *os)
{
    bytearray_output_stream_init(os, file_tmp, file_size);
    buffer_output_stream_init(os, os, 4096);
    return SUCCESS;
}

static ya_result init_buffer_output_stream_1b_init(output_stream_t *os)
{
    bytearray_output_stream_init(os, file_tmp, file_size);
    buffer_output_stream_init(os, os, 1);
    return SUCCESS;
}

static ya_result init_buffer_output_stream_4k_broken_init(output_stream_t *os)
{
    bytearray_output_stream_init(os, file_tmp, file_size);
    broken_output_stream_init(os, os);
    buffer_output_stream_init(os, os, 4096);
    return SUCCESS;
}

static ya_result init_buffer_output_stream_1b_broken_init(output_stream_t *os)
{
    bytearray_output_stream_init(os, file_tmp, file_size);
    broken_output_stream_init(os, os);
    buffer_output_stream_init(os, os, 1);
    return SUCCESS;
}

struct os_constructor os_constructors[] = {{init_bytearray_output_stream_init_const, "bytearray_output_stream_init_const"},
                                           {init_bytearray_output_stream_init_notowned, "bytearray_output_stream_init(notowned)"},
                                           {init_buffer_output_stream_4k_init, "buffer_output_stream_4k_init"},
                                           {init_buffer_output_stream_1b_init, "buffer_output_stream_1b_init"},
                                           {init_buffer_output_stream_4k_broken_init, "buffer_output_stream_4k_broken_init"},
                                           {init_buffer_output_stream_1b_broken_init, "buffer_output_stream_1b_broken_init"},
                                           {NULL, NULL}};

static ya_result      test_output_write(output_stream_t *os, const char *prefix)
{
    ya_result ret = output_stream_write(os, logger_channel_file_t, file_size);

    if(FAIL(ret))
    {
        formatln("%s: test_output_write: failure: %r", prefix, ret);
        return ret;
    }

    if((size_t)ret != file_size)
    {
        formatln("%s: test_output_write: short write: %i instead of %i", prefix, ret, file_size);
        return ERROR;
    }

    output_stream_close(os);

    if(ISOK(ret = sha1_match(file_tmp, file_size)))
    {
        formatln("%s: test_output_write: digest SUCCESS", prefix);
    }
    else
    {
        formatln("%s: test_output_write: digest FAILURE", prefix);
    }

    return ret;
}

static ya_result test_output_writefully(output_stream_t *os, const char *prefix)
{
    ya_result ret = output_stream_write_fully(os, logger_channel_file_t, file_size);

    if(FAIL(ret))
    {
        formatln("%s: test_output_writefully: failure: %r", prefix, ret);
        return ret;
    }

    if((size_t)ret != file_size)
    {
        formatln("%s: test_output_writefully: short writefully: %i instead of %i", prefix, ret, file_size);
        return ERROR;
    }

    output_stream_close(os);

    if(ISOK(ret = sha1_match(file_tmp, file_size)))
    {
        formatln("%s: test_output_writefully: digest SUCCESS", prefix);
    }
    else
    {
        formatln("%s: test_output_writefully: digest FAILURE", prefix);
    }

    return ret;
}

static ya_result test_output_writefully_by_bits(output_stream_t *os, const char *prefix)
{
    ya_result ret = SUCCESS;
    int32_t   remaining = file_size;
    size_t    offset = 0;
    int       index = 0;

    while(remaining > 0)
    {
        int32_t chunk = mostly_primes[index++ % MOSTLY_PRIMES_COUNT];
        if(chunk > remaining)
        {
            chunk = remaining;
        }

        remaining -= chunk;

        ret = output_stream_write_fully(os, &logger_channel_file_t[offset], chunk);

        if(FAIL(ret))
        {
            formatln("%s: test_output_writefully_by_bits: failure trying to write %i bytes (position %i): %r", prefix, chunk, offset, ret);
            return ret;
        }

        if(ret != chunk)
        {
            formatln("%s: test_output_writefully_by_bits: short write: %i instead of %i", prefix, ret, chunk);
            ret = ERROR;
            return ret;
        }

        offset += chunk;
    }

    output_stream_close(os);

    if(ISOK(ret = sha1_match(file_tmp, file_size)))
    {
        formatln("%s: test_output_writefully_by_bits: digest SUCCESS", prefix);
    }
    else
    {
        formatln("%s: test_output_writefully_by_bits: digest FAILURE", prefix);
        ret = ERROR;
    }

    return ret;
}

static void      clear_tmp() { memset(file_tmp, 0xde, file_size); }

static ya_result test_is()
{
    input_stream_t is;
    ya_result      ret;

    for(int_fast32_t i = 0; is_constructors[i].name != NULL; ++i)
    {
        is_constructors[i].init(&is);
        ret = test_input_read(&is, is_constructors[i].name);
        clear_tmp();
        if(FAIL(ret))
        {
            return ret;
        }

        is_constructors[i].init(&is);
        ret = test_input_readfully(&is, is_constructors[i].name);
        clear_tmp();
        if(FAIL(ret))
        {
            return ret;
        }

        is_constructors[i].init(&is);
        ret = test_input_readfully_by_bits(&is, is_constructors[i].name);
        clear_tmp();
        if(FAIL(ret))
        {
            return ret;
        }

        formatln("%s: PASSED", is_constructors[i].name);
        flushout();
    }

    return SUCCESS;
}
static ya_result test_os()
{
    output_stream_t os;
    ya_result       ret;

    for(int_fast32_t i = 0; os_constructors[i].name != NULL; ++i)
    {
        os_constructors[i].init(&os);
        ret = test_output_write(&os, os_constructors[i].name);
        clear_tmp();
        if(FAIL(ret))
        {
            return ret;
        }

        os_constructors[i].init(&os);
        ret = test_output_writefully(&os, os_constructors[i].name);
        clear_tmp();
        if(FAIL(ret))
        {
            return ret;
        }

        os_constructors[i].init(&os);
        ret = test_output_writefully_by_bits(&os, os_constructors[i].name);
        clear_tmp();
        if(FAIL(ret))
        {
            return ret;
        }

        formatln("%s: PASSED", os_constructors[i].name);
        flushout();
    }

    return SUCCESS;
}

int main(int argc, char *argv[])
{
    (void)argc;
    (void)argv;

    /* initializes the core library */
    dnscore_init();

    // prepare some input data

    rndctx = random_init(0); // constant seed

    file_size = 0x8000000; // 128 MB
    logger_channel_file_t = malloc(file_size * 2);
    if(logger_channel_file_t == NULL)
    {
        return EXIT_FAILURE;
    }
    file_tmp = &logger_channel_file_t[file_size];

    for(size_t i = 0; i < file_size; i += 4)
    {
        SET_U32_AT(logger_channel_file_t[i], random_next(rndctx));
    }

    sha1(logger_channel_file_t, file_size, file_digest, sizeof(file_digest));

    // the input data is ready

    ya_result ret;

    ret = test_is();

    if(ISOK(ret))
    {
        ret = test_os();
    }

    flushout();
    flusherr();
    fflush(NULL);

    dnscore_finalize();

    return ISOK(ret) ? EXIT_SUCCESS : EXIT_FAILURE;
}