isc/tests/buffer_test.c

/*
 * Copyright (C) 2014-2016  Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include <config.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

#include <atf-c.h>

#include "isctest.h"

#include <isc/buffer.h>
#include <isc/result.h>

ATF_TC(isc_buffer_reserve);
ATF_TC_HEAD(isc_buffer_reserve, tc) {
    atf_tc_set_md_var(tc, "descr", "reserve space in dynamic buffers");
}

ATF_TC_BODY(isc_buffer_reserve, tc) {
    isc_result_t result;
    isc_buffer_t *b;

    result = isc_test_begin(NULL, ISC_TRUE);
    ATF_REQUIRE_EQ(result, ISC_R_SUCCESS);

    b = NULL;
    result = isc_buffer_allocate(mctx, &b, 1024);
    ATF_CHECK_EQ(result, ISC_R_SUCCESS);
    ATF_CHECK_EQ(b->length, 1024);

    /*
     * 1024 bytes should already be available, so this call does
     * nothing.
     */
    result = isc_buffer_reserve(&b, 1024);
    ATF_CHECK_EQ(result, ISC_R_SUCCESS);
    ATF_CHECK(ISC_BUFFER_VALID(b));
    ATF_REQUIRE(b != NULL);
    ATF_CHECK_EQ(b->length, 1024);

    /*
     * This call should grow it to 2048 bytes as only 1024 bytes are
     * available in the buffer.
     */
    result = isc_buffer_reserve(&b, 1025);
    ATF_CHECK_EQ(result, ISC_R_SUCCESS);
    ATF_CHECK(ISC_BUFFER_VALID(b));
    ATF_REQUIRE(b != NULL);
    ATF_CHECK_EQ(b->length, 2048);

    /*
     * 2048 bytes should already be available, so this call does
     * nothing.
     */
    result = isc_buffer_reserve(&b, 2000);
    ATF_CHECK_EQ(result, ISC_R_SUCCESS);
    ATF_CHECK(ISC_BUFFER_VALID(b));
    ATF_REQUIRE(b != NULL);
    ATF_CHECK_EQ(b->length, 2048);

    /*
     * This call should grow it to 4096 bytes as only 2048 bytes are
     * available in the buffer.
     */
    result = isc_buffer_reserve(&b, 3000);
    ATF_CHECK_EQ(result, ISC_R_SUCCESS);
    ATF_CHECK(ISC_BUFFER_VALID(b));
    ATF_REQUIRE(b != NULL);
    ATF_CHECK_EQ(b->length, 4096);

    /* Consume some of the buffer so we can run the next test. */
    isc_buffer_add(b, 4096);

    /*
     * This call should fail and leave buffer untouched.
     */
    result = isc_buffer_reserve(&b, UINT_MAX);
    ATF_CHECK_EQ(result, ISC_R_NOMEMORY);
    ATF_CHECK(ISC_BUFFER_VALID(b));
    ATF_REQUIRE(b != NULL);
    ATF_CHECK_EQ(b->length, 4096);

    isc_buffer_free(&b);

    isc_test_end();
}

ATF_TC(isc_buffer_reallocate);
ATF_TC_HEAD(isc_buffer_reallocate, tc) {
    atf_tc_set_md_var(tc, "descr", "reallocate dynamic buffers");
}

ATF_TC_BODY(isc_buffer_reallocate, tc) {
    isc_result_t result;
    isc_buffer_t *b;

    result = isc_test_begin(NULL, ISC_TRUE);
    ATF_REQUIRE_EQ(result, ISC_R_SUCCESS);

    b = NULL;
    result = isc_buffer_allocate(mctx, &b, 1024);
    ATF_CHECK_EQ(result, ISC_R_SUCCESS);
    ATF_REQUIRE(b != NULL);
    ATF_CHECK_EQ(b->length, 1024);

    result = isc_buffer_reallocate(&b, 512);
    ATF_CHECK_EQ(result, ISC_R_NOSPACE);
    ATF_CHECK(ISC_BUFFER_VALID(b));
    ATF_REQUIRE(b != NULL);
    ATF_CHECK_EQ(b->length, 1024);

    result = isc_buffer_reallocate(&b, 1536);
    ATF_CHECK_EQ(result, ISC_R_SUCCESS);
    ATF_CHECK(ISC_BUFFER_VALID(b));
    ATF_REQUIRE(b != NULL);
    ATF_CHECK_EQ(b->length, 1536);

    isc_buffer_free(&b);

    isc_test_end();
}

ATF_TC(isc_buffer_dynamic);
ATF_TC_HEAD(isc_buffer_dynamic, tc) {
    atf_tc_set_md_var(tc, "descr", "dynamic buffer automatic reallocation");
}

ATF_TC_BODY(isc_buffer_dynamic, tc) {
    isc_result_t result;
    isc_buffer_t *b;
    size_t last_length = 10;
    int i;

    result = isc_test_begin(NULL, ISC_TRUE);
    ATF_REQUIRE_EQ(result, ISC_R_SUCCESS);

    b = NULL;
    result = isc_buffer_allocate(mctx, &b, last_length);
    ATF_CHECK_EQ(result, ISC_R_SUCCESS);
    ATF_REQUIRE(b != NULL);
    ATF_CHECK_EQ(b->length, last_length);

    isc_buffer_setautorealloc(b, ISC_TRUE);

    isc_buffer_putuint8(b, 1);

    for (i = 0; i < 1000; i++) {
        isc_buffer_putstr(b, "thisisa24charslongstring");
    }
    ATF_CHECK(b->length-last_length >= 1000*24);
    last_length+=1000*24;

    for (i = 0; i < 10000; i++) {
        isc_buffer_putuint8(b, 1);
    }

    ATF_CHECK(b->length-last_length >= 10000*1);
    last_length += 10000*1;

    for (i = 0; i < 10000; i++) {
        isc_buffer_putuint16(b, 1);
    }

    ATF_CHECK(b->length-last_length >= 10000*2);

    last_length += 10000*2;
    for (i = 0; i < 10000; i++) {
        isc_buffer_putuint24(b, 1);
    }
    ATF_CHECK(b->length-last_length >= 10000*3);

    last_length+=10000*3;

    for (i = 0; i < 10000; i++) {
        isc_buffer_putuint32(b, 1);
    }
    ATF_CHECK(b->length-last_length >= 10000*4);


    isc_buffer_free(&b);

    isc_test_end();
}

/*
 * Main
 */
ATF_TP_ADD_TCS(tp) {
    ATF_TP_ADD_TC(tp, isc_buffer_reserve);
    ATF_TP_ADD_TC(tp, isc_buffer_reallocate);
    ATF_TP_ADD_TC(tp, isc_buffer_dynamic);
    return (atf_no_error());
}