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62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
// Copyright (c) 2015 The Decred developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package dcrutil
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// bitflags contains a simple series of functions to handle bitwise boolean
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// operations in uint16s.
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// Flags16 is the type for 2 bytes of flags; not really used except in the
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// declaration below.
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type Flags16 uint16
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// Flag fields for uint16.
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const (
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FlagNone Flags16 = 0
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BlockValid = 1 << 0 // Describes whether TxTreeRegular is valid
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Flag01 = 1 << 1
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Flag02 = 1 << 2
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Flag03 = 1 << 3
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Flag04 = 1 << 4
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Flag05 = 1 << 5
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Flag06 = 1 << 6
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Flag07 = 1 << 7
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Flag08 = 1 << 8
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Flag09 = 1 << 9
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Flag10 = 1 << 10
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Flag11 = 1 << 11
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Flag12 = 1 << 12
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Flag13 = 1 << 13
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Flag14 = 1 << 14
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Flag15 = 1 << 15
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)
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// IsFlagSet16 returns true/false for a flag at flag field 'flag'.
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func IsFlagSet16(flags uint16, flag uint16) bool {
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return flags&flag != 0
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}
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// SetFlag16 sets a bit flag at flag position 'flag' to bool 'b'.
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func SetFlag16(flags *uint16, flag uint16, b bool) {
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if b {
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*flags = *flags | flag
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} else {
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*flags = *flags &^ flag
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}
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}
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// BoolArray16 is a bool array that is generated from a uint16 containing flags.
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type BoolArray16 [16]bool
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// GenerateBoolArray16 generates a BoolArray16 from a uint16 containing flags.
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func GenerateBoolArray16(flags uint16) BoolArray16 {
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var ba BoolArray16
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for i := uint8(0); i < 16; i++ {
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ba[i] = (flags&(1<<i) != 0)
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}
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return ba
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}
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