66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
#pragma once
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#include <glacier/buffer/byte_buffer.h>
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#include <glacier/buffer/cap_buffer.h>
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#include <glacier/container/vector.h>
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#include <glacier/status/error_or.h>
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#include <glacier/status/status.h>
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namespace yunq {
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const uint64_t kHeaderSize = 24; // 4x uint32, 1x uint64
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struct MessageHeader {
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uint32_t ident;
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uint32_t core_length;
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uint32_t length;
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uint32_t crc32;
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uint64_t options;
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} __attribute__((packed));
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struct ExtensionPointer {
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uint32_t offset;
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uint32_t length;
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};
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class MessageView {
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public:
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MessageView(const glcr::ByteBuffer& buffer, uint64_t offset)
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: buffer_(buffer), offset_(offset) {}
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[[nodiscard]] glcr::Status CheckHeader() const;
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// TODO: Implement glcr::StatusOr
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template <typename T>
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glcr::ErrorOr<T> ReadField(uint64_t field_index) const;
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template <typename T>
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glcr::ErrorOr<glcr::Vector<T>> ReadRepeated(uint64_t field_index) const;
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glcr::ErrorOr<uint64_t> ReadCapability(uint64_t field_index) const;
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glcr::ErrorOr<uint64_t> ReadCapability(uint64_t field_index,
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const glcr::CapBuffer& caps) const;
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private:
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const glcr::ByteBuffer& buffer_;
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uint64_t offset_;
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uint64_t field_offset(uint64_t field_index) const {
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return offset_ + kHeaderSize + (8 * field_index);
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}
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};
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template <>
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glcr::ErrorOr<uint64_t> MessageView::ReadField<uint64_t>(
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uint64_t field_index) const;
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template <>
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glcr::ErrorOr<glcr::String> MessageView::ReadField<glcr::String>(
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uint64_t field_index) const;
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template <>
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glcr::ErrorOr<glcr::Vector<uint64_t>> MessageView::ReadRepeated<uint64_t>(
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uint64_t field_index) const;
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} // namespace yunq
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