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Merge pull request #991 from Fenny/master
🚀 improve json encoding
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| package json | ||
|
|
||
| import ( | ||
| "unsafe" | ||
| ) | ||
|
|
||
| var endianness int | ||
|
|
||
| func init() { | ||
| var b [2]byte | ||
| *(*uint16)(unsafe.Pointer(&b)) = uint16(0xABCD) | ||
|
|
||
| switch b[0] { | ||
| case 0xCD: | ||
| endianness = 0 // LE | ||
| case 0xAB: | ||
| endianness = 1 // BE | ||
| default: | ||
| panic("could not determine endianness") | ||
| } | ||
| } | ||
|
|
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| // "00010203...96979899" cast to []uint16 | ||
| var intLELookup = [100]uint16{ | ||
| 0x3030, 0x3130, 0x3230, 0x3330, 0x3430, 0x3530, 0x3630, 0x3730, 0x3830, 0x3930, | ||
| 0x3031, 0x3131, 0x3231, 0x3331, 0x3431, 0x3531, 0x3631, 0x3731, 0x3831, 0x3931, | ||
| 0x3032, 0x3132, 0x3232, 0x3332, 0x3432, 0x3532, 0x3632, 0x3732, 0x3832, 0x3932, | ||
| 0x3033, 0x3133, 0x3233, 0x3333, 0x3433, 0x3533, 0x3633, 0x3733, 0x3833, 0x3933, | ||
| 0x3034, 0x3134, 0x3234, 0x3334, 0x3434, 0x3534, 0x3634, 0x3734, 0x3834, 0x3934, | ||
| 0x3035, 0x3135, 0x3235, 0x3335, 0x3435, 0x3535, 0x3635, 0x3735, 0x3835, 0x3935, | ||
| 0x3036, 0x3136, 0x3236, 0x3336, 0x3436, 0x3536, 0x3636, 0x3736, 0x3836, 0x3936, | ||
| 0x3037, 0x3137, 0x3237, 0x3337, 0x3437, 0x3537, 0x3637, 0x3737, 0x3837, 0x3937, | ||
| 0x3038, 0x3138, 0x3238, 0x3338, 0x3438, 0x3538, 0x3638, 0x3738, 0x3838, 0x3938, | ||
| 0x3039, 0x3139, 0x3239, 0x3339, 0x3439, 0x3539, 0x3639, 0x3739, 0x3839, 0x3939, | ||
| } | ||
|
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| var intBELookup = [100]uint16{ | ||
| 0x3030, 0x3031, 0x3032, 0x3033, 0x3034, 0x3035, 0x3036, 0x3037, 0x3038, 0x3039, | ||
| 0x3130, 0x3131, 0x3132, 0x3133, 0x3134, 0x3135, 0x3136, 0x3137, 0x3138, 0x3139, | ||
| 0x3230, 0x3231, 0x3232, 0x3233, 0x3234, 0x3235, 0x3236, 0x3237, 0x3238, 0x3239, | ||
| 0x3330, 0x3331, 0x3332, 0x3333, 0x3334, 0x3335, 0x3336, 0x3337, 0x3338, 0x3339, | ||
| 0x3430, 0x3431, 0x3432, 0x3433, 0x3434, 0x3435, 0x3436, 0x3437, 0x3438, 0x3439, | ||
| 0x3530, 0x3531, 0x3532, 0x3533, 0x3534, 0x3535, 0x3536, 0x3537, 0x3538, 0x3539, | ||
| 0x3630, 0x3631, 0x3632, 0x3633, 0x3634, 0x3635, 0x3636, 0x3637, 0x3638, 0x3639, | ||
| 0x3730, 0x3731, 0x3732, 0x3733, 0x3734, 0x3735, 0x3736, 0x3737, 0x3738, 0x3739, | ||
| 0x3830, 0x3831, 0x3832, 0x3833, 0x3834, 0x3835, 0x3836, 0x3837, 0x3838, 0x3839, | ||
| 0x3930, 0x3931, 0x3932, 0x3933, 0x3934, 0x3935, 0x3936, 0x3937, 0x3938, 0x3939, | ||
| } | ||
|
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| var intLookup = [2]*[100]uint16{&intLELookup, &intBELookup} | ||
|
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| func appendInt(b []byte, n int64) []byte { | ||
| return formatInteger(b, uint64(n), n < 0) | ||
| } | ||
|
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| func appendUint(b []byte, n uint64) []byte { | ||
| return formatInteger(b, n, false) | ||
| } | ||
|
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| func formatInteger(out []byte, n uint64, negative bool) []byte { | ||
| if !negative { | ||
| if n < 10 { | ||
| return append(out, byte(n+'0')) | ||
| } else if n < 100 { | ||
| u := intLELookup[n] | ||
| return append(out, byte(u), byte(u>>8)) | ||
| } | ||
| } else { | ||
| n = -n | ||
| } | ||
|
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| lookup := intLookup[endianness] | ||
|
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| var b [22]byte | ||
| u := (*[11]uint16)(unsafe.Pointer(&b)) | ||
| i := 11 | ||
|
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| for n >= 100 { | ||
| j := n % 100 | ||
| n /= 100 | ||
| i-- | ||
| u[i] = lookup[j] | ||
| } | ||
|
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| i-- | ||
| u[i] = lookup[n] | ||
|
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| i *= 2 // convert to byte index | ||
| if n < 10 { | ||
| i++ // remove leading zero | ||
| } | ||
| if negative { | ||
| i-- | ||
| b[i] = '-' | ||
| } | ||
|
|
||
| return append(out, b[i:]...) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| package json | ||
|
|
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| import ( | ||
| "math" | ||
| "strconv" | ||
| "testing" | ||
| ) | ||
|
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| func TestAppendInt(t *testing.T) { | ||
| var ints []int64 | ||
| for i := 0; i < 64; i++ { | ||
| u := uint64(1) << i | ||
| ints = append(ints, int64(u-1), int64(u), int64(u+1), -int64(u)) | ||
| } | ||
|
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| var std [20]byte | ||
| var our [20]byte | ||
|
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| for _, i := range ints { | ||
| expected := strconv.AppendInt(std[:], i, 10) | ||
| actual := appendInt(our[:], i) | ||
| if string(expected) != string(actual) { | ||
| t.Fatalf("appendInt(%d) = %v, expected = %v", i, string(actual), string(expected)) | ||
| } | ||
| } | ||
| } | ||
|
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| func benchStd(b *testing.B, n int64) { | ||
| var buf [20]byte | ||
| b.ResetTimer() | ||
| for i := 0; i < b.N; i++ { | ||
| strconv.AppendInt(buf[:0], n, 10) | ||
| } | ||
| } | ||
|
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| func benchNew(b *testing.B, n int64) { | ||
| var buf [20]byte | ||
| b.ResetTimer() | ||
| for i := 0; i < b.N; i++ { | ||
| appendInt(buf[:0], n) | ||
| } | ||
| } | ||
|
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| func BenchmarkAppendIntStd1(b *testing.B) { | ||
| benchStd(b, 1) | ||
| } | ||
|
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| func BenchmarkAppendInt1(b *testing.B) { | ||
| benchNew(b, 1) | ||
| } | ||
|
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| func BenchmarkAppendIntStdMinI64(b *testing.B) { | ||
| benchStd(b, math.MinInt64) | ||
| } | ||
|
|
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| func BenchmarkAppendIntMinI64(b *testing.B) { | ||
| benchNew(b, math.MinInt64) | ||
| } |
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