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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}
48 lines
1.3 KiB
C++
48 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_writer.h"
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#include <vector>
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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(BoundedByteWriterTest, CanWriteData) {
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std::vector<uint8_t> data(14);
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BoundedByteWriter<8> writer(data);
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writer.Store32<0>(0x01020304);
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writer.Store16<4>(0x0506);
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writer.Store8<6>(0x07);
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writer.Store8<7>(0x08);
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uint8_t variable_data[] = {0, 0, 0, 0, 3, 0};
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writer.CopyToVariableData(variable_data);
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BoundedByteWriter<6> sub = writer.sub_writer<6>(0);
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sub.Store32<0>(0x09000000);
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sub.Store16<2>(0x0102);
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BoundedByteWriter<2> sub2 = writer.sub_writer<2>(4);
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sub2.Store8<1>(0x04);
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EXPECT_THAT(data, ElementsAre(1, 2, 3, 4, 5, 6, 7, 8, 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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