411 lines
9.6 KiB
Go
411 lines
9.6 KiB
Go
package msgp
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import (
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"math"
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"reflect"
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"time"
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)
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// ensure 'sz' extra bytes in 'b' btw len(b) and cap(b)
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func ensure(b []byte, sz int) ([]byte, int) {
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l := len(b)
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c := cap(b)
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if c-l < sz {
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o := make([]byte, (2*c)+sz) // exponential growth
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n := copy(o, b)
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return o[:n+sz], n
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}
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return b[:l+sz], l
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}
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// AppendMapHeader appends a map header with the
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// given size to the slice
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func AppendMapHeader(b []byte, sz uint32) []byte {
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switch {
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case sz <= 15:
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return append(b, wfixmap(uint8(sz)))
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case sz <= math.MaxUint16:
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o, n := ensure(b, 3)
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prefixu16(o[n:], mmap16, uint16(sz))
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return o
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default:
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o, n := ensure(b, 5)
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prefixu32(o[n:], mmap32, sz)
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return o
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}
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}
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// AppendArrayHeader appends an array header with
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// the given size to the slice
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func AppendArrayHeader(b []byte, sz uint32) []byte {
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switch {
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case sz <= 15:
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return append(b, wfixarray(uint8(sz)))
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case sz <= math.MaxUint16:
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o, n := ensure(b, 3)
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prefixu16(o[n:], marray16, uint16(sz))
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return o
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default:
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o, n := ensure(b, 5)
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prefixu32(o[n:], marray32, sz)
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return o
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}
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}
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// AppendNil appends a 'nil' byte to the slice
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func AppendNil(b []byte) []byte { return append(b, mnil) }
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// AppendFloat64 appends a float64 to the slice
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func AppendFloat64(b []byte, f float64) []byte {
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o, n := ensure(b, Float64Size)
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prefixu64(o[n:], mfloat64, math.Float64bits(f))
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return o
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}
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// AppendFloat32 appends a float32 to the slice
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func AppendFloat32(b []byte, f float32) []byte {
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o, n := ensure(b, Float32Size)
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prefixu32(o[n:], mfloat32, math.Float32bits(f))
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return o
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}
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// AppendInt64 appends an int64 to the slice
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func AppendInt64(b []byte, i int64) []byte {
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if i >= 0 {
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switch {
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case i <= math.MaxInt8:
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return append(b, wfixint(uint8(i)))
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case i <= math.MaxInt16:
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o, n := ensure(b, 3)
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putMint16(o[n:], int16(i))
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return o
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case i <= math.MaxInt32:
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o, n := ensure(b, 5)
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putMint32(o[n:], int32(i))
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return o
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default:
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o, n := ensure(b, 9)
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putMint64(o[n:], i)
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return o
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}
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}
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switch {
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case i >= -32:
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return append(b, wnfixint(int8(i)))
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case i >= math.MinInt8:
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o, n := ensure(b, 2)
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putMint8(o[n:], int8(i))
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return o
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case i >= math.MinInt16:
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o, n := ensure(b, 3)
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putMint16(o[n:], int16(i))
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return o
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case i >= math.MinInt32:
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o, n := ensure(b, 5)
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putMint32(o[n:], int32(i))
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return o
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default:
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o, n := ensure(b, 9)
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putMint64(o[n:], i)
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return o
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}
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}
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// AppendInt appends an int to the slice
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func AppendInt(b []byte, i int) []byte { return AppendInt64(b, int64(i)) }
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// AppendInt8 appends an int8 to the slice
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func AppendInt8(b []byte, i int8) []byte { return AppendInt64(b, int64(i)) }
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// AppendInt16 appends an int16 to the slice
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func AppendInt16(b []byte, i int16) []byte { return AppendInt64(b, int64(i)) }
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// AppendInt32 appends an int32 to the slice
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func AppendInt32(b []byte, i int32) []byte { return AppendInt64(b, int64(i)) }
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// AppendUint64 appends a uint64 to the slice
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func AppendUint64(b []byte, u uint64) []byte {
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switch {
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case u <= (1<<7)-1:
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return append(b, wfixint(uint8(u)))
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case u <= math.MaxUint8:
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o, n := ensure(b, 2)
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putMuint8(o[n:], uint8(u))
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return o
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case u <= math.MaxUint16:
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o, n := ensure(b, 3)
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putMuint16(o[n:], uint16(u))
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return o
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case u <= math.MaxUint32:
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o, n := ensure(b, 5)
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putMuint32(o[n:], uint32(u))
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return o
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default:
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o, n := ensure(b, 9)
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putMuint64(o[n:], u)
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return o
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}
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}
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// AppendUint appends a uint to the slice
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func AppendUint(b []byte, u uint) []byte { return AppendUint64(b, uint64(u)) }
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// AppendUint8 appends a uint8 to the slice
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func AppendUint8(b []byte, u uint8) []byte { return AppendUint64(b, uint64(u)) }
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// AppendByte is analogous to AppendUint8
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func AppendByte(b []byte, u byte) []byte { return AppendUint8(b, uint8(u)) }
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// AppendUint16 appends a uint16 to the slice
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func AppendUint16(b []byte, u uint16) []byte { return AppendUint64(b, uint64(u)) }
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// AppendUint32 appends a uint32 to the slice
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func AppendUint32(b []byte, u uint32) []byte { return AppendUint64(b, uint64(u)) }
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// AppendBytes appends bytes to the slice as MessagePack 'bin' data
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func AppendBytes(b []byte, bts []byte) []byte {
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sz := len(bts)
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var o []byte
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var n int
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switch {
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case sz <= math.MaxUint8:
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o, n = ensure(b, 2+sz)
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prefixu8(o[n:], mbin8, uint8(sz))
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n += 2
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case sz <= math.MaxUint16:
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o, n = ensure(b, 3+sz)
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prefixu16(o[n:], mbin16, uint16(sz))
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n += 3
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default:
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o, n = ensure(b, 5+sz)
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prefixu32(o[n:], mbin32, uint32(sz))
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n += 5
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}
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return o[:n+copy(o[n:], bts)]
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}
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// AppendBool appends a bool to the slice
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func AppendBool(b []byte, t bool) []byte {
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if t {
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return append(b, mtrue)
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}
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return append(b, mfalse)
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}
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// AppendString appends a string as a MessagePack 'str' to the slice
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func AppendString(b []byte, s string) []byte {
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sz := len(s)
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var n int
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var o []byte
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switch {
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case sz <= 31:
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o, n = ensure(b, 1+sz)
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o[n] = wfixstr(uint8(sz))
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n++
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case sz <= math.MaxUint8:
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o, n = ensure(b, 2+sz)
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prefixu8(o[n:], mstr8, uint8(sz))
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n += 2
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case sz <= math.MaxUint16:
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o, n = ensure(b, 3+sz)
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prefixu16(o[n:], mstr16, uint16(sz))
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n += 3
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default:
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o, n = ensure(b, 5+sz)
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prefixu32(o[n:], mstr32, uint32(sz))
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n += 5
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}
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return o[:n+copy(o[n:], s)]
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}
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// AppendStringFromBytes appends a []byte
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// as a MessagePack 'str' to the slice 'b.'
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func AppendStringFromBytes(b []byte, str []byte) []byte {
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sz := len(str)
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var n int
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var o []byte
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switch {
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case sz <= 31:
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o, n = ensure(b, 1+sz)
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o[n] = wfixstr(uint8(sz))
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n++
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case sz <= math.MaxUint8:
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o, n = ensure(b, 2+sz)
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prefixu8(o[n:], mstr8, uint8(sz))
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n += 2
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case sz <= math.MaxUint16:
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o, n = ensure(b, 3+sz)
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prefixu16(o[n:], mstr16, uint16(sz))
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n += 3
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default:
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o, n = ensure(b, 5+sz)
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prefixu32(o[n:], mstr32, uint32(sz))
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n += 5
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}
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return o[:n+copy(o[n:], str)]
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}
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// AppendComplex64 appends a complex64 to the slice as a MessagePack extension
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func AppendComplex64(b []byte, c complex64) []byte {
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o, n := ensure(b, Complex64Size)
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o[n] = mfixext8
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o[n+1] = Complex64Extension
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big.PutUint32(o[n+2:], math.Float32bits(real(c)))
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big.PutUint32(o[n+6:], math.Float32bits(imag(c)))
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return o
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}
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// AppendComplex128 appends a complex128 to the slice as a MessagePack extension
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func AppendComplex128(b []byte, c complex128) []byte {
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o, n := ensure(b, Complex128Size)
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o[n] = mfixext16
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o[n+1] = Complex128Extension
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big.PutUint64(o[n+2:], math.Float64bits(real(c)))
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big.PutUint64(o[n+10:], math.Float64bits(imag(c)))
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return o
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}
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// AppendTime appends a time.Time to the slice as a MessagePack extension
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func AppendTime(b []byte, t time.Time) []byte {
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o, n := ensure(b, TimeSize)
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t = t.UTC()
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o[n] = mext8
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o[n+1] = 12
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o[n+2] = TimeExtension
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putUnix(o[n+3:], t.Unix(), int32(t.Nanosecond()))
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return o
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}
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// AppendMapStrStr appends a map[string]string to the slice
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// as a MessagePack map with 'str'-type keys and values
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func AppendMapStrStr(b []byte, m map[string]string) []byte {
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sz := uint32(len(m))
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b = AppendMapHeader(b, sz)
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for key, val := range m {
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b = AppendString(b, key)
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b = AppendString(b, val)
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}
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return b
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}
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// AppendMapStrIntf appends a map[string]interface{} to the slice
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// as a MessagePack map with 'str'-type keys.
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func AppendMapStrIntf(b []byte, m map[string]interface{}) ([]byte, error) {
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sz := uint32(len(m))
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b = AppendMapHeader(b, sz)
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var err error
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for key, val := range m {
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b = AppendString(b, key)
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b, err = AppendIntf(b, val)
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if err != nil {
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return b, err
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}
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}
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return b, nil
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}
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// AppendIntf appends the concrete type of 'i' to the
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// provided []byte. 'i' must be one of the following:
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// - 'nil'
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// - A bool, float, string, []byte, int, uint, or complex
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// - A map[string]interface{} or map[string]string
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// - A []T, where T is another supported type
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// - A *T, where T is another supported type
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// - A type that satisfieds the msgp.Marshaler interface
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// - A type that satisfies the msgp.Extension interface
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func AppendIntf(b []byte, i interface{}) ([]byte, error) {
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if i == nil {
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return AppendNil(b), nil
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}
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// all the concrete types
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// for which we have methods
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switch i := i.(type) {
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case Marshaler:
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return i.MarshalMsg(b)
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case Extension:
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return AppendExtension(b, i)
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case bool:
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return AppendBool(b, i), nil
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case float32:
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return AppendFloat32(b, i), nil
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case float64:
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return AppendFloat64(b, i), nil
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case complex64:
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return AppendComplex64(b, i), nil
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case complex128:
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return AppendComplex128(b, i), nil
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case string:
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return AppendString(b, i), nil
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case []byte:
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return AppendBytes(b, i), nil
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case int8:
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return AppendInt8(b, i), nil
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case int16:
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return AppendInt16(b, i), nil
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case int32:
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return AppendInt32(b, i), nil
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case int64:
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return AppendInt64(b, i), nil
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case int:
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return AppendInt64(b, int64(i)), nil
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case uint:
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return AppendUint64(b, uint64(i)), nil
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case uint8:
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return AppendUint8(b, i), nil
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case uint16:
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return AppendUint16(b, i), nil
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case uint32:
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return AppendUint32(b, i), nil
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case uint64:
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return AppendUint64(b, i), nil
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case time.Time:
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return AppendTime(b, i), nil
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case map[string]interface{}:
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return AppendMapStrIntf(b, i)
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case map[string]string:
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return AppendMapStrStr(b, i), nil
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case []interface{}:
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b = AppendArrayHeader(b, uint32(len(i)))
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var err error
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for _, k := range i {
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b, err = AppendIntf(b, k)
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if err != nil {
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return b, err
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}
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}
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return b, nil
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}
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var err error
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v := reflect.ValueOf(i)
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switch v.Kind() {
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case reflect.Array, reflect.Slice:
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l := v.Len()
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b = AppendArrayHeader(b, uint32(l))
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for i := 0; i < l; i++ {
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b, err = AppendIntf(b, v.Index(i).Interface())
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if err != nil {
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return b, err
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}
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}
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return b, nil
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case reflect.Ptr:
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if v.IsNil() {
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return AppendNil(b), err
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}
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b, err = AppendIntf(b, v.Elem().Interface())
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return b, err
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default:
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return b, &ErrUnsupportedType{T: v.Type()}
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}
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}
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