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26 lines
573 B
Go
26 lines
573 B
Go
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/*
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* SPDX-License-Identifier: AGPL-3.0-only
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* Copyright (c) since 2023, v2rayA Organization <team@v2raya.org>
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*/
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package quicutils
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import "io"
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// BigEndianUvarint decodes a uint64 from buf and returns that value and the
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// number of bytes read (> 0).
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func BigEndianUvarint(buf []byte) (uint64, int, error) {
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if len(buf) == 0 {
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return 0, 0, io.ErrUnexpectedEOF
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}
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length := 1 << (buf[0] >> 6)
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if length == 0 {
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return 0, 0, io.ErrUnexpectedEOF
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}
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x := uint64(buf[0] & 0x3f)
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for i := 1; i < length; i++ {
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x = x<<8 | uint64(buf[i])
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}
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return x, length, nil
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}
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