mirror of
https://github.com/matrix-construct/construct
synced 2024-08-30 13:25:15 +02:00
687 lines
13 KiB
C++
687 lines
13 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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//
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// object
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//
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ircd::cbor::object::object(const const_buffer &buf)
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:item{buf}
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{
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const head &head{*this};
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if(unlikely(head.major() != major::OBJECT))
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throw type_error
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{
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"Supplied item is a '%s' and not an OBJECT", reflect(head.major())
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};
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}
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ircd::cbor::object::member
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ircd::cbor::object::operator[](const string_view &name)
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const
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{
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const_iterator it{*this};
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for(; it; ++it)
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{
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const string item{it->first};
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if(item.value() == name)
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return *it;
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}
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throw std::out_of_range
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{
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"object member not found"
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};
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}
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ircd::const_buffer
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ircd::cbor::object::value()
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const
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{
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return {};
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}
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size_t
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ircd::cbor::object::count()
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const
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{
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const head &head{*this};
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const positive &positive{head};
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return uint64_t(positive);
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}
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//
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// object::const_iterator
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//
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ircd::cbor::object::const_iterator::const_iterator(const cbor::object &object)
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:object{object}
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,state{[this]() -> member
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{
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if(!this->object.count())
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return {};
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const const_buffer &obuf{this->object};
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const head &head{obuf};
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const_buffer key
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{
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ircd::data(obuf) + head.length(), ircd::end(obuf)
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};
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const cbor::head &keyhead{key};
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switch(keyhead.major())
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{
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case major::POSITIVE:
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case major::NEGATIVE:
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case major::TAG:
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case major::PRIMITIVE:
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{
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std::get<1>(key) = std::get<0>(key) + keyhead.length();
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break;
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}
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case major::BINARY:
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case major::STRING:
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{
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const cbor::positive keypositive(keyhead);
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std::get<1>(key) = std::get<0>(key) + keyhead.length() + uint64_t(keypositive);
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break;
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}
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case major::ARRAY:
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case major::OBJECT:
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default: throw type_error
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{
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"Unknown major type; length of value unknown"
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};
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}
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const_buffer val
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{
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ircd::end(key), ircd::end(obuf)
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};
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const cbor::head &valhead{val};
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switch(valhead.major())
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{
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case major::POSITIVE:
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case major::NEGATIVE:
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case major::TAG:
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case major::PRIMITIVE:
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{
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std::get<1>(val) = std::get<0>(val) + valhead.length();
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break;
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}
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case major::BINARY:
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case major::STRING:
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{
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const cbor::positive valpositive(valhead);
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std::get<1>(val) = std::get<0>(val) + valhead.length() + uint64_t(valpositive);
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break;
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}
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case major::ARRAY:
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case major::OBJECT:
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default: throw type_error
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{
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"Unknown major type; length of value unknown"
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};
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}
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return { key, val };
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}()}
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{
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const const_buffer &obuf{this->object};
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if(unlikely(data(state.first) > data(obuf) + size(obuf)))
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throw buffer_underrun
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{
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"Object iteration leads beyond the supplied object buffer"
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};
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}
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ircd::cbor::object::const_iterator &
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ircd::cbor::object::const_iterator::operator++()
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{
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return *this;
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}
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//
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// array
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//
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ircd::cbor::array::array(const const_buffer &buf)
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:item{buf}
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{
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const head &head{*this};
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if(unlikely(head.major() != major::ARRAY))
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throw type_error
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{
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"Supplied item is a '%s' and not an ARRAY", reflect(head.major())
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};
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}
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ircd::cbor::item
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ircd::cbor::array::operator[](size_t i)
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const
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{
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const_iterator it{*this};
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for(; it && i > 0; --i, ++it);
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return *it;
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}
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ircd::cbor::array::const_iterator
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ircd::cbor::array::begin()
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const
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{
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const_iterator ret(*this);
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if(!this->count())
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return ret;
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const const_buffer &abuf{*this};
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const head &head{abuf};
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ret.state = { ircd::data(abuf) + head.length(), ircd::end(abuf) };
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const cbor::head &elemhead{ret.state};
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switch(elemhead.major())
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{
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case major::POSITIVE:
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case major::NEGATIVE:
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case major::TAG:
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case major::PRIMITIVE:
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{
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std::get<1>(ret.state) = std::get<0>(ret.state) + elemhead.length();
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break;
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}
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case major::BINARY:
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case major::STRING:
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{
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const cbor::positive elempositive(elemhead);
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std::get<1>(ret.state) = std::get<0>(ret.state) + elemhead.length() + uint64_t(elempositive);
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break;
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}
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case major::ARRAY:
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case major::OBJECT:
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default: throw type_error
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{
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"Unknown major type; length of value unknown"
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};
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}
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if(unlikely(data(ret.state) > data(abuf) + size(abuf)))
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throw buffer_underrun
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{
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"Array iteration leads beyond the supplied array buffer"
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};
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return ret;
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}
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ircd::cbor::array::const_iterator
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ircd::cbor::array::end()
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const
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{
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return {*this};
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}
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ircd::const_buffer
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ircd::cbor::array::value()
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const
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{
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return {};
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}
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size_t
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ircd::cbor::array::count()
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const
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{
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const head &head{*this};
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const positive &positive{head};
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return uint64_t(positive);
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}
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//
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// array::const_iterator
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//
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ircd::cbor::array::const_iterator::const_iterator(const cbor::array &array)
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:array{array}
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{
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}
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ircd::cbor::array::const_iterator &
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ircd::cbor::array::const_iterator::operator++()
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{
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const const_buffer &buf{this->array};
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state =
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{
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data(state) + size(state), data(buf) + size(buf)
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};
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if(data(state) == data(buf) + size(buf))
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return *this;
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assert(!!state);
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const head &head{state};
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switch(head.major())
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{
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case major::POSITIVE:
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case major::NEGATIVE:
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case major::TAG:
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case major::PRIMITIVE:
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{
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std::get<1>(state) = std::get<0>(state) + head.length();
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break;
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}
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case major::BINARY:
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case major::STRING:
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{
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const positive positive(head);
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std::get<1>(state) = std::get<0>(state) + head.length() + uint64_t(positive);
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break;
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}
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case major::ARRAY:
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case major::OBJECT:
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default: throw type_error
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{
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"Unknown major type; length of value unknown"
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};
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}
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if(unlikely(data(state) > data(buf) + size(buf)))
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throw buffer_underrun
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{
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"Array iteration leads beyond the supplied array buffer"
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};
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return *this;
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}
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//
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// string
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//
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ircd::cbor::string::string(const const_buffer &buf)
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:binary{buf}
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{
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const head &head{*this};
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if(unlikely(head.major() != major::STRING))
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throw type_error
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{
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"Supplied item is a '%s' and not a STRING",
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reflect(head.major())
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};
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}
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ircd::cbor::string::operator
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string_view()
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const
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{
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return value();
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}
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ircd::string_view
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ircd::cbor::string::value()
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const
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{
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const binary &bin{*this};
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return string_view{bin.value()};
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}
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//
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// binary
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//
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ircd::cbor::binary::binary(const const_buffer &buf)
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:positive
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{
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buf
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}
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{
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item &item{*this};
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const head &head{item};
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if(unlikely(head.major() != major::BINARY && head.major() != major::STRING))
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throw type_error
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{
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"Supplied item is a '%s' and not a BINARY or STRING",
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reflect(head.major())
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};
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const_buffer &itembuf{item};
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itembuf = value();
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if(unlikely(size(itembuf) > size(buf)))
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throw buffer_underrun
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{
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"Length of binary data item (%zu) exceeds supplied buffer (%zu)",
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size(itembuf),
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size(buf)
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};
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}
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ircd::const_buffer
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ircd::cbor::binary::value()
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const
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{
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const item &item{*this};
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const const_buffer &buf{item};
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const head head{item};
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const positive &positive{*this};
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const uint64_t length{positive};
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return const_buffer
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{
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ircd::data(buf) + head.length(), length
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};
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}
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//
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// negative
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//
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ircd::cbor::negative::negative(const head &head)
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:positive{head}
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{
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}
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ircd::cbor::negative::operator
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int64_t()
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const
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{
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return value();
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}
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int64_t
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ircd::cbor::negative::value()
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const
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{
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const positive positive(*this);
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const uint64_t &val(positive);
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return 1 - val;
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}
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//
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// positive
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//
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ircd::cbor::positive::positive(const head &head)
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:item{head}
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{
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}
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ircd::cbor::positive::operator
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uint64_t()
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const
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{
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return value();
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}
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uint64_t
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ircd::cbor::positive::value()
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const
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{
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const head &head{*this};
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if(head.minor() > 23) switch(head.minor())
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{
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case minor::U8: return head.following<uint8_t>();
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case minor::U16: return ntoh(head.following<uint16_t>());
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case minor::U32: return ntoh(head.following<uint32_t>());
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case minor::U64: return ntoh(head.following<uint64_t>());
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default: throw parse_error
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{
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"Unknown minor type; length of value unknown"
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};
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}
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else return head.minor();
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}
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//
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// item
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//
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ircd::cbor::item::item(const const_buffer &buf)
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:const_buffer{buf}
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{}
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ircd::const_buffer
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ircd::cbor::item::value()
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const
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{
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return {};
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}
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ircd::cbor::item::operator
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ircd::cbor::head()
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const
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{
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const const_buffer &buf(*this);
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return cbor::head{buf};
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}
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//
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// head
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//
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/// Given a buffer of CBOR this function parses the head data and maintains
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/// a const_buffer span of the head. The span includes the leading head byte
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/// and one or more integer bytes following the leading byte. If the major
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/// type found in this head has a data payload which is not a following-integer
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/// then that data starts directly after this head buffer ends.
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///
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/// The argument buffer must be at least one byte and must at least cover the
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/// following-integer bytes (and can also be as large as possible).
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///
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ircd::cbor::head::head(const const_buffer &buf)
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:const_buffer{[&buf]
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{
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if(unlikely(size(buf) < sizeof(uint8_t)))
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throw buffer_underrun
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{
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"Item buffer is too small to contain a header"
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};
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const uint8_t &leading
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{
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*reinterpret_cast<const uint8_t *>(data(buf))
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};
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return const_buffer
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{
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data(buf), length(leading)
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};
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}()}
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{
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if(unlikely(size(*this) > size(buf)))
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throw buffer_underrun
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{
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"Item buffer is too small to contain full header"
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};
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}
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/// Pun a reference to the integer contained by the bytes following the head.
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/// If there are no bytes following the head because the integer is contained
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/// as bits packed into the leading head byte, this function will throw.
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///
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template<class T>
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const T &
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ircd::cbor::head::following()
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const
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{
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if(unlikely(size(following()) < sizeof(T)))
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throw buffer_underrun
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{
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"Buffer following header is too small (%zu) for type requiring %zu",
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size(following()),
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sizeof(T)
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};
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return *reinterpret_cast<const T *>(data(following()));
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}
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/// Return buffer spanning the integer bytes following this head. This may be
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/// an empty buffer if the integer byte is packed into bits of the leading
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/// byte (denoted by minor()).
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ircd::const_buffer
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ircd::cbor::head::following()
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const
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{
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return { data(*this) + 1, length() - 1 };
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}
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/// Extract the length of the head from the buffer (requires 1 byte of buffer)
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size_t
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ircd::cbor::head::length()
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const
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{
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return length(leading());
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}
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/// Extract the minor type from the reference to the leading byte in the head.
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enum ircd::cbor::minor
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ircd::cbor::head::minor()
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const
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{
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return static_cast<enum minor>(minor(leading()));
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}
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/// Extract the major type from the reference to the leading byte in the head.
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enum ircd::cbor::major
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ircd::cbor::head::major()
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const
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{
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return static_cast<enum major>(major(leading()));
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}
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/// Reference the leading byte of the head.
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const uint8_t &
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ircd::cbor::head::leading()
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const
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{
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assert(size(*this) >= sizeof(uint8_t));
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return *reinterpret_cast<const uint8_t *>(data(*this));
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}
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/// Extract length of head from leading head byte (arg); this is the length of
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/// the integer following the leading head byte plus the one leading head
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/// byte. This length covers all bytes which come before item payload bytes
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/// (when such a payload exists). If this length is 1 then no integer bytes
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/// are following the leading head byte. The length/returned value is never 0.
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size_t
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ircd::cbor::head::length(const uint8_t &a)
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{
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switch(major(a))
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{
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case POSITIVE:
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case NEGATIVE:
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case BINARY:
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case STRING:
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case ARRAY:
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case OBJECT:
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case TAG:
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{
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if(minor(a) > 23) switch(minor(a))
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{
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case minor::U8: return 2;
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case minor::U16: return 3;
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case minor::U32: return 5;
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case minor::U64: return 9;
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default: throw type_error
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{
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"Unknown minor type (%u); length of header unknown", minor(a)
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};
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}
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else return 1;
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}
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case PRIMITIVE:
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{
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if(minor(a) > 23) switch(minor(a))
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{
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case FALSE:
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case TRUE:
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case NUL:
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case UD: return 1;
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case minor::F16: return 3;
|
|
case minor::F32: return 5;
|
|
case minor::F64: return 9;
|
|
default: throw type_error
|
|
{
|
|
"Unknown primitive minor type (%u); length of header unknown", minor(a)
|
|
};
|
|
}
|
|
else return 1;
|
|
}
|
|
|
|
default: throw type_error
|
|
{
|
|
"Unknown major type; length of header unknown"
|
|
};
|
|
}
|
|
}
|
|
|
|
/// Extract major type from leading head byte (arg)
|
|
uint8_t
|
|
ircd::cbor::head::major(const uint8_t &a)
|
|
{
|
|
// shift for higher 3 bits only
|
|
static const int &shift(5);
|
|
return a >> shift;
|
|
}
|
|
|
|
/// Extract minor type from leading head byte (arg)
|
|
uint8_t
|
|
ircd::cbor::head::minor(const uint8_t &a)
|
|
{
|
|
// mask of lower 5 bits only
|
|
static const uint8_t &mask
|
|
{
|
|
uint8_t(0xFF) >> 3
|
|
};
|
|
|
|
return a & mask;
|
|
}
|
|
|
|
//
|
|
// cbor.h
|
|
//
|
|
|
|
enum ircd::cbor::major
|
|
ircd::cbor::major(const const_buffer &buf)
|
|
{
|
|
const head head(buf);
|
|
return head.major();
|
|
}
|
|
|
|
ircd::string_view
|
|
ircd::cbor::reflect(const enum major &major)
|
|
{
|
|
switch(major)
|
|
{
|
|
case major::POSITIVE: return "POSITIVE";
|
|
case major::NEGATIVE: return "NEGATIVE";
|
|
case major::BINARY: return "BINARY";
|
|
case major::STRING: return "STRING";
|
|
case major::ARRAY: return "ARRAY";
|
|
case major::OBJECT: return "OBJECT";
|
|
case major::TAG: return "TAG";
|
|
case major::PRIMITIVE: return "PRIMITIVE";
|
|
}
|
|
|
|
return "??????";
|
|
}
|