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106 lines
4.7 KiB
C++
106 lines
4.7 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE framework.
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Copyright (c) Raw Material Software Limited
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JUCE is an open source framework subject to commercial or open source
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licensing.
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By downloading, installing, or using the JUCE framework, or combining the
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JUCE framework with any other source code, object code, content or any other
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copyrightable work, you agree to the terms of the JUCE End User Licence
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Agreement, and all incorporated terms including the JUCE Privacy Policy and
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the JUCE Website Terms of Service, as applicable, which will bind you. If you
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do not agree to the terms of these agreements, we will not license the JUCE
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framework to you, and you must discontinue the installation or download
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process and cease use of the JUCE framework.
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JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
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JUCE Privacy Policy: https://juce.com/juce-privacy-policy
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JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
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Or:
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You may also use this code under the terms of the AGPLv3:
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https://www.gnu.org/licenses/agpl-3.0.en.html
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THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
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WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
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==============================================================================
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*/
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namespace juce::midi_ci::detail
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{
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/*
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Breaks up a large property exchange message into chunks of the requested size.
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Note that the header *must* fit inside the first block, so you must ensure
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that the header is small enough to fit inside the requested chunk size.
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*/
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class PropertyDataMessageChunker
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{
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auto tie() const { return std::tie (storage, body, source, dest, chunkSize, messageKind, requestId); }
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public:
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/* Constructs a chunker instance.
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@param storageIn backing storage where each chunk will be written
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@param chunkSizeIn the maximum size of each chunk
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@param messageKindIn the subID2 byte identifying the type of message in each chunk
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@param requestIdIn the id that should be included in all messages that are part of the same property exchange transaction
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@param headerIn the header bytes of the message. This is always JSON encoded as 7-bit ASCII text, see the MIDI-CI spec for full details
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@param sourceIn the MUID of the device sending the chunked messages
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@param destIn the MUID of the recipient of the chunked messages
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@param bodyIn a stream that can supply the data payload for this chunk sequence. All payload bytes *must* be 7-bit (MSB not set).
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*/
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PropertyDataMessageChunker (std::vector<std::byte>& storageIn,
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int chunkSizeIn,
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const std::byte messageKindIn,
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const std::byte requestIdIn,
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Span<const std::byte> headerIn,
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MUID sourceIn,
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MUID destIn,
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InputStream& bodyIn);
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/* Returns true if this chunker hasn't finished producing chunks. */
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explicit operator bool() const { return *this != PropertyDataMessageChunker(); }
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/* Allowing foreach usage. */
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auto begin() const { return *this; }
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/* Allow foreach usage. */
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auto end() const { return PropertyDataMessageChunker{}; }
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/* Writes the bytes of the next chunk, if any, into the storage buffer. */
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PropertyDataMessageChunker& operator++() noexcept;
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/* Checks whether the state of this chunker matches the state of another chunker, enabling foreach usage. */
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bool operator== (const PropertyDataMessageChunker& other) const noexcept { return tie() == other.tie(); }
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bool operator!= (const PropertyDataMessageChunker& other) const noexcept { return tie() != other.tie(); }
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/* Returns a span over the valid bytes in the output buffer. */
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Span<const std::byte> operator*() const noexcept;
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private:
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PropertyDataMessageChunker() = default;
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Span<const std::byte> getHeaderForBlock() const;
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int getRoomForBody() const;
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bool hasRoomForBody() const;
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void populateStorage() const;
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Span<const std::byte> header;
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std::vector<std::byte>* storage{};
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InputStream* body{};
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MUID source = MUID::makeUnchecked (0), dest = MUID::makeUnchecked (0);
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int chunkSize{};
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uint16_t thisChunk { 0x01 };
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std::byte messageKind{};
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std::byte requestId{};
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};
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} // namespace juce::midi_ci::detail
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