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/*
* Copyright (c) 2015, 2018 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* 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 the copyright holders 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
* OWNER 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.
*
* Authors: Andreas Sandberg
*/
#include <gtest/gtest.h>
#include "base/circlebuf.hh"
const char data[] = {
0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf,
};
// Basic non-overflow functionality
TEST(CircleBufTest, BasicReadWriteNoOverflow)
{
CircleBuf<char> buf(8);
char foo[16];
// Write empty buffer, no overflow
buf.write(data, 8);
EXPECT_EQ(buf.size(), 8);
buf.peek(foo, 8);
EXPECT_EQ(memcmp(foo, data, 8), 0);
// Read 2
buf.read(foo, 2);
EXPECT_EQ(memcmp(foo, data, 2), 0);
EXPECT_EQ(buf.size(), 6);
buf.read(foo, 6);
EXPECT_EQ(memcmp(foo, data + 2, 6), 0);
EXPECT_EQ(buf.size(), 0);
}
// Basic single write overflow functionality
TEST(CircleBufTest, SingleWriteOverflow)
{
CircleBuf<char> buf(8);
char foo[16];
buf.write(data, 16);
EXPECT_EQ(buf.size(), 8);
buf.peek(foo, 8);
EXPECT_EQ(memcmp(data + 8, foo, 8), 0);
}
// Multi-write overflow functionality
TEST(CircleBufTest, MultiWriteOverflow)
{
CircleBuf<char> buf(8);
char foo[16];
// Write, no overflow, write overflow
buf.write(data, 6);
buf.write(data + 8, 6);
EXPECT_EQ(buf.size(), 8);
buf.peek(foo, 8);
EXPECT_EQ(memcmp(data + 4, foo, 2), 0);
EXPECT_EQ(memcmp(data + 8, foo + 2, 6), 0);
}
// Pointer wrap around
TEST(CircleBufTest, PointerWrapAround)
{
CircleBuf<char> buf(8);
char foo[16];
// _start == 0, _stop = 8
buf.write(data, 8);
// _start == 4, _stop = 8
buf.read(foo, 4);
// _start == 4, _stop = 12
buf.write(data + 8, 4);
EXPECT_EQ(buf.size(), 8);
// _start == 10, _stop = 12
// Normalized: _start == 2, _stop = 4
buf.read(foo + 4, 6);
EXPECT_EQ(buf.size(), 2);
EXPECT_EQ(memcmp(data, foo, 10), 0);
// Normalized: _start == 4, _stop = 4
buf.read(foo + 10, 2);
EXPECT_EQ(buf.size(), 0);
EXPECT_EQ(memcmp(data, foo, 12), 0);
}
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