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87 lines
3.2 KiB
C++
87 lines
3.2 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2022 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 7 End-User License
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Agreement and JUCE Privacy Policy.
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End User License Agreement: www.juce.com/juce-7-licence
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Privacy Policy: www.juce.com/juce-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce::midi_ci
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{
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/**
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Utility functions for working with data formats used by property exchange
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messages.
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@tags{Audio}
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*/
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struct Encodings
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{
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/** Text in ACK and NAK messages can't be utf-8 or ASCII because each byte only has 7 usable bits.
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The encoding rules are in section 5.10.4 of the CI spec.
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*/
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static String stringFrom7BitText (Span<const std::byte> bytes);
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/** Text in ACK and NAK messages can't be utf-8 or ASCII because each byte only has 7 usable bits.
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The encoding rules are in section 5.10.4 of the CI spec.
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*/
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static std::vector<std::byte> stringTo7BitText (const String& text);
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/** Converts a list of bytes representing a 7-bit ASCII string to JSON. */
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static var jsonFrom7BitText (Span<const std::byte> bytes)
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{
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return JSON::parse (stringFrom7BitText (bytes));
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}
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/** Converts a JSON object to a list of bytes in 7-bit ASCII format. */
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static std::vector<std::byte> jsonTo7BitText (const var& v)
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{
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return stringTo7BitText (JSON::toString (v, true));
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}
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/** Each group of seven stored bytes is transmitted as eight bytes.
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First, the sign bits of the seven bytes are sent, followed by the low-order 7 bits of each byte.
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*/
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static std::vector<std::byte> toMcoded7 (Span<const std::byte> bytes);
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/** Each group of seven stored bytes is transmitted as eight bytes.
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First, the sign bits of the seven bytes are sent, followed by the low-order 7 bits of each byte.
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*/
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static std::vector<std::byte> fromMcoded7 (Span<const std::byte> bytes);
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/** Attempts to encode the provided byte span using the specified encoding.
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The ASCII encoding does not make any changes to the input stream, but
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encoding will fail if any byte has its most significant bit set.
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*/
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static std::optional<std::vector<std::byte>> tryEncode (Span<const std::byte> bytes,
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Encoding mutualEncoding);
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/** Decodes the provided byte span using the specified encoding.
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All bytes of the input must be 7-bit values, i.e. all most-significant bits
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are unset.
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*/
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static std::vector<std::byte> decode (Span<const std::byte> bytes, Encoding mutualEncoding);
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Encodings() = delete;
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};
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} // namespace juce::midi_ci
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