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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. 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.
 *
 * 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.
 */

#include "cx/utils.h"

#include "cx/buffer.h"

#include <gtest/gtest.h>

TEST(Utils, cx_stream_bncopy) {
    CxBuffer source, target;
    char sbuf[32], tbuf[32];
    memset(tbuf, 0, 32);
    cxBufferInit(&source, sbuf, 32, nullptr, 0);
    cxBufferInit(&target, tbuf, 32, nullptr, 0);
    cxBufferPutString(&source, "This is a stream copy test.");
    cxBufferSeek(&source, 0, SEEK_SET);

    char tmp[4];
    size_t result = cx_stream_bncopy(&source, &target,
                                     (cx_read_func) cxBufferRead,
                                     (cx_write_func) cxBufferWrite,
                                     tmp, 4, 20);
    EXPECT_EQ(20, result);
    EXPECT_EQ(20, target.size);
    EXPECT_STREQ("This is a stream cop\0", tbuf);

    result = cx_stream_bcopy(&source, &target,
                             (cx_read_func) cxBufferRead,
                             (cx_write_func) cxBufferWrite,
                             nullptr, 16);

    EXPECT_EQ(7, result);
    EXPECT_EQ(27, target.size);
    EXPECT_STREQ("This is a stream copy test.\0", tbuf);

    cxBufferDestroy(&source);
    cxBufferDestroy(&target);
}

TEST(Utils, cx_stream_ncopy) {
    CxBuffer source, target;
    char sbuf[32], tbuf[32];
    memset(tbuf, 0, 32);
    cxBufferInit(&source, sbuf, 32, nullptr, 0);
    cxBufferInit(&target, tbuf, 32, nullptr, 0);
    cxBufferPutString(&source, "This is a stream copy test.");
    cxBufferSeek(&source, 0, SEEK_SET);

    size_t result = cx_stream_ncopy(&source, &target,
                                    (cx_read_func) cxBufferRead,
                                    (cx_write_func) cxBufferWrite,
                                    20);
    EXPECT_EQ(20, result);
    EXPECT_EQ(20, target.size);
    EXPECT_STREQ("This is a stream cop\0", tbuf);

    result = cx_stream_copy(&source, &target,
                            (cx_read_func) cxBufferRead,
                            (cx_write_func) cxBufferWrite);

    EXPECT_EQ(7, result);
    EXPECT_EQ(27, target.size);
    EXPECT_STREQ("This is a stream copy test.\0", tbuf);

    cxBufferDestroy(&source);
    cxBufferDestroy(&target);
}

TEST(Utils, ForN) {
    unsigned j;
    j = 0;
    cx_for_n(i, 50) {
        EXPECT_EQ(i, j);
        j++;
    }
}

TEST(Utils, swap_ptr) {
    int i = 5;
    int j = 8;
    int *ip = &i;
    int *jp = &j;
    cx_swap_ptr(ip, jp);
    EXPECT_EQ(ip, &j);
    EXPECT_EQ(jp, &i);
}

TEST(Utils, szmul) {
    size_t r;
    int e;
    e = cx_szmul(5, 7, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(35, r);

    size_t s = SIZE_MAX & ~3;

    e = cx_szmul(s / 4, 2, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(s / 2, r);
    e = cx_szmul(2, s / 4, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(s / 2, r);

    e = cx_szmul(s / 4, 4, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(s, r);

    e = cx_szmul(4, s / 4, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(s, r);

    e = cx_szmul(s / 4, 5, &r);
    EXPECT_NE(0, e);

    e = cx_szmul(5, s / 4, &r);
    EXPECT_NE(0, e);

    e = cx_szmul(SIZE_MAX - 4, 0, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(0, r);

    e = cx_szmul(0, SIZE_MAX - 1, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(0, r);

    e = cx_szmul(SIZE_MAX, 0, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(0, r);

    e = cx_szmul(0, SIZE_MAX, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(0, r);

    e = cx_szmul(0, 0, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(0, r);
}

#ifdef CX_SZMUL_BUILTIN

// also test the custom implementation
struct Utils_szmul_impl : ::testing::Test {
#undef CX_SZMUL_BUILTIN

#include "../src/szmul.c"

#define CX_SZMUL_BUILTIN
};

TEST_F(Utils_szmul_impl, Test) {
    size_t r;
    int e;
    e = cx_szmul_impl(5, 7, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(35, r);

    size_t s = SIZE_MAX & ~3;

    e = cx_szmul_impl(s / 4, 2, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(s / 2, r);
    e = cx_szmul_impl(2, s / 4, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(s / 2, r);

    e = cx_szmul_impl(s / 4, 4, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(s, r);

    e = cx_szmul_impl(4, s / 4, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(s, r);

    e = cx_szmul_impl(s / 4, 5, &r);
    EXPECT_NE(0, e);

    e = cx_szmul_impl(5, s / 4, &r);
    EXPECT_NE(0, e);

    e = cx_szmul_impl(SIZE_MAX - 4, 0, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(0, r);

    e = cx_szmul_impl(0, SIZE_MAX - 1, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(0, r);

    e = cx_szmul_impl(SIZE_MAX, 0, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(0, r);

    e = cx_szmul_impl(0, SIZE_MAX, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(0, r);

    e = cx_szmul_impl(0, 0, &r);
    EXPECT_EQ(0, e);
    EXPECT_EQ(0, r);
}

#endif // CX_SZMUL_BUILTIN