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7d3c49a171
Packets, chunks, parameters and error causes - the SCTP entities that are sent on the wire - are buffers with fields that are stored in big endian and that generally consist of a fixed header size, and a variable sized part, that can e.g. be encoded sub-fields or serialized strings. The BoundedByteReader and BoundedByteWriter utilities make it easy to read those fields with as much aid from the compiler as possible, by having compile-time assertions that fields are not accessed outside the buffer's span. There are some byte reading functionality already in modules/rtp_rtcp, but that module would be a bit unfortunate to depend on, and doesn't have the compile time bounds checking that is the biggest feature of this abstraction of an rtc::ArrayView. Bug: webrtc:12614 Change-Id: I9fc641aff22221018dda9add4e2c44853c0f64f0 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/212967 Commit-Queue: Victor Boivie <boivie@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Tommi <tommi@webrtc.org> Cr-Commit-Position: refs/heads/master@{#33597}
43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
/*
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* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "net/dcsctp/packet/bounded_byte_reader.h"
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#include "api/array_view.h"
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#include "rtc_base/buffer.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/gunit.h"
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#include "test/gmock.h"
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namespace dcsctp {
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namespace {
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using ::testing::ElementsAre;
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TEST(BoundedByteReaderTest, CanLoadData) {
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uint8_t data[14] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4};
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BoundedByteReader<8> reader(data);
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EXPECT_EQ(reader.variable_data_size(), 6U);
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EXPECT_EQ(reader.Load32<0>(), 0x01020304U);
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EXPECT_EQ(reader.Load32<4>(), 0x05060708U);
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EXPECT_EQ(reader.Load16<4>(), 0x0506U);
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EXPECT_EQ(reader.Load8<4>(), 0x05U);
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EXPECT_EQ(reader.Load8<5>(), 0x06U);
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BoundedByteReader<6> sub = reader.sub_reader<6>(0);
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EXPECT_EQ(sub.Load16<0>(), 0x0900U);
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EXPECT_EQ(sub.Load32<0>(), 0x09000102U);
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EXPECT_EQ(sub.Load16<4>(), 0x0304U);
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EXPECT_THAT(reader.variable_data(), ElementsAre(9, 0, 1, 2, 3, 4));
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}
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} // namespace
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} // namespace dcsctp
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