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/*
* Copyright (c) 2013 Zhen, LLC. http://zhen.io. All rights reserved.
* Use of this source code is governed by the Apache 2.0 license.
*
*/
package encoding
import (
"fmt"
)
func FloorBy(value, factor int) int {
return value - value%factor
}
func CeilBy(value, factor int) int {
return value + factor - value%factor
}
func LeadingBitPosition(x uint32) int32 {
//return 32 - int32(nlz1a(x))
return int32(bitlen(uint64(x)))
}
func DeltaMaxBits(initoffset int32, buf []int32) int32 {
var mask int32
for _, v := range buf {
mask |= v - initoffset
initoffset = v
}
return LeadingBitPosition(uint32(mask))
}
func MaxBits(buf []int32) int32 {
var mask int32
for _, v := range buf {
mask |= v
}
return LeadingBitPosition(uint32(mask))
}
func PrintInt32sInBits(buf []int32) {
fmt.Println(" 10987654321098765432109876543210")
for i, v := range buf {
fmt.Printf("%4d: %20d %032b\n", i, v, uint32(v))
}
}
func Delta(in, out []int32, offset int32) {
for i, v := range in {
out[i] = v - offset
offset = v
}
}
func InverseDelta(in, out []int32, offset int32) {
for i, v := range in {
out[i] = v + offset
offset = out[i]
}
}
// https://developers.google.com/protocol-buffers/docs/encoding#types
func ZigZagDelta(in, out []int32) {
offset := int32(0)
for i, v := range in {
n := v - offset
out[i] = (n << 1) ^ (n >> 31)
offset = v
}
}
func InverseZigZagDelta(in, out []int32) {
offset := int32(0)
for i, v := range in {
//n := int32(uint32(v) >> 1) ^ (-(v & 1))
n := int32(uint32(v)>>1) ^ ((v << 31) >> 31)
out[i] = n + offset
offset = out[i]
}
}
// Copied from http://www.hackersdelight.org/hdcodetxt/nlz.c.txt - nlz1a
func nlz1a(x uint32) uint32 {
var n uint32 = 0
if x <= 0 {
return (^x >> 26) & 32
}
n = 1
if (x >> 16) == 0 {
n = n + 16
x = x << 16
}
if (x >> 24) == 0 {
n = n + 8
x = x << 8
}
if (x >> 28) == 0 {
n = n + 4
x = x << 4
}
if (x >> 30) == 0 {
n = n + 2
x = x << 2
}
n = n - (x >> 31)
return n
}
func nlz2(x uint32) uint32 {
var y uint32
var n uint32 = 32
y = x >> 16
if y != 0 {
n = n - 16
x = y
}
y = x >> 8
if y != 0 {
n = n - 8
x = y
}
y = x >> 4
if y != 0 {
n = n - 4
x = y
}
y = x >> 2
if y != 0 {
n = n - 2
x = y
}
y = x >> 1
if y != 0 {
return n - 2
}
return n - x
}
/* The following are unrolled versions, but they are probably slower due to range checks */
func UnrolledDelta128(in, out []int32, offset int32) {
out[0] = in[0] - offset
out[1] = in[1] - in[0]
out[2] = in[2] - in[1]
out[3] = in[3] - in[2]
out[4] = in[4] - in[3]
out[5] = in[5] - in[4]
out[6] = in[6] - in[5]
out[7] = in[7] - in[6]
out[8] = in[8] - in[7]
out[9] = in[9] - in[8]
out[10] = in[10] - in[9]
out[11] = in[11] - in[10]
out[12] = in[12] - in[11]
out[13] = in[13] - in[12]
out[14] = in[14] - in[13]
out[15] = in[15] - in[14]
out[16] = in[16] - in[15]
out[17] = in[17] - in[16]
out[18] = in[18] - in[17]
out[19] = in[19] - in[18]
out[20] = in[20] - in[19]
out[21] = in[21] - in[20]
out[22] = in[22] - in[21]
out[23] = in[23] - in[22]
out[24] = in[24] - in[23]
out[25] = in[25] - in[24]
out[26] = in[26] - in[25]
out[27] = in[27] - in[26]
out[28] = in[28] - in[27]
out[29] = in[29] - in[28]
out[30] = in[30] - in[29]
out[31] = in[31] - in[30]
out[32] = in[32] - in[31]
out[33] = in[33] - in[32]
out[34] = in[34] - in[33]
out[35] = in[35] - in[34]
out[36] = in[36] - in[35]
out[37] = in[37] - in[36]
out[38] = in[38] - in[37]
out[39] = in[39] - in[38]
out[40] = in[40] - in[39]
out[41] = in[41] - in[40]
out[42] = in[42] - in[41]
out[43] = in[43] - in[42]
out[44] = in[44] - in[43]
out[45] = in[45] - in[44]
out[46] = in[46] - in[45]
out[47] = in[47] - in[46]
out[48] = in[48] - in[47]
out[49] = in[49] - in[48]
out[50] = in[50] - in[49]
out[51] = in[51] - in[50]
out[52] = in[52] - in[51]
out[53] = in[53] - in[52]
out[54] = in[54] - in[53]
out[55] = in[55] - in[54]
out[56] = in[56] - in[55]
out[57] = in[57] - in[56]
out[58] = in[58] - in[57]
out[59] = in[59] - in[58]
out[60] = in[60] - in[59]
out[61] = in[61] - in[60]
out[62] = in[62] - in[61]
out[63] = in[63] - in[62]
out[64] = in[64] - in[63]
out[65] = in[65] - in[64]
out[66] = in[66] - in[65]
out[67] = in[67] - in[66]
out[68] = in[68] - in[67]
out[69] = in[69] - in[68]
out[70] = in[70] - in[69]
out[71] = in[71] - in[70]
out[72] = in[72] - in[71]
out[73] = in[73] - in[72]
out[74] = in[74] - in[73]
out[75] = in[75] - in[74]
out[76] = in[76] - in[75]
out[77] = in[77] - in[76]
out[78] = in[78] - in[77]
out[79] = in[79] - in[78]
out[80] = in[80] - in[79]
out[81] = in[81] - in[80]
out[82] = in[82] - in[81]
out[83] = in[83] - in[82]
out[84] = in[84] - in[83]
out[85] = in[85] - in[84]
out[86] = in[86] - in[85]
out[87] = in[87] - in[86]
out[88] = in[88] - in[87]
out[89] = in[89] - in[88]
out[90] = in[90] - in[89]
out[91] = in[91] - in[90]
out[92] = in[92] - in[91]
out[93] = in[93] - in[92]
out[94] = in[94] - in[93]
out[95] = in[95] - in[94]
out[96] = in[96] - in[95]
out[97] = in[97] - in[96]
out[98] = in[98] - in[97]
out[99] = in[99] - in[98]
out[100] = in[100] - in[99]
out[101] = in[101] - in[100]
out[102] = in[102] - in[101]
out[103] = in[103] - in[102]
out[104] = in[104] - in[103]
out[105] = in[105] - in[104]
out[106] = in[106] - in[105]
out[107] = in[107] - in[106]
out[108] = in[108] - in[107]
out[109] = in[109] - in[108]
out[110] = in[110] - in[109]
out[111] = in[111] - in[110]
out[112] = in[112] - in[111]
out[113] = in[113] - in[112]
out[114] = in[114] - in[113]
out[115] = in[115] - in[114]
out[116] = in[116] - in[115]
out[117] = in[117] - in[116]
out[118] = in[118] - in[117]
out[119] = in[119] - in[118]
out[120] = in[120] - in[119]
out[121] = in[121] - in[120]
out[122] = in[122] - in[121]
out[123] = in[123] - in[122]
out[124] = in[124] - in[123]
out[125] = in[125] - in[124]
out[126] = in[126] - in[125]
out[127] = in[127] - in[126]
}
func UnrolledInverseDelta128(in, out []int32, offset int32) {
out[0] = in[0] + offset
out[1] = in[1] + out[0]
out[2] = in[2] + out[1]
out[3] = in[3] + out[2]
out[4] = in[4] + out[3]
out[5] = in[5] + out[4]
out[6] = in[6] + out[5]
out[7] = in[7] + out[6]
out[8] = in[8] + out[7]
out[9] = in[9] + out[8]
out[10] = in[10] + out[9]
out[11] = in[11] + out[10]
out[12] = in[12] + out[11]
out[13] = in[13] + out[12]
out[14] = in[14] + out[13]
out[15] = in[15] + out[14]
out[16] = in[16] + out[15]
out[17] = in[17] + out[16]
out[18] = in[18] + out[17]
out[19] = in[19] + out[18]
out[20] = in[20] + out[19]
out[21] = in[21] + out[20]
out[22] = in[22] + out[21]
out[23] = in[23] + out[22]
out[24] = in[24] + out[23]
out[25] = in[25] + out[24]
out[26] = in[26] + out[25]
out[27] = in[27] + out[26]
out[28] = in[28] + out[27]
out[29] = in[29] + out[28]
out[30] = in[30] + out[29]
out[31] = in[31] + out[30]
out[32] = in[32] + out[31]
out[33] = in[33] + out[32]
out[34] = in[34] + out[33]
out[35] = in[35] + out[34]
out[36] = in[36] + out[35]
out[37] = in[37] + out[36]
out[38] = in[38] + out[37]
out[39] = in[39] + out[38]
out[40] = in[40] + out[39]
out[41] = in[41] + out[40]
out[42] = in[42] + out[41]
out[43] = in[43] + out[42]
out[44] = in[44] + out[43]
out[45] = in[45] + out[44]
out[46] = in[46] + out[45]
out[47] = in[47] + out[46]
out[48] = in[48] + out[47]
out[49] = in[49] + out[48]
out[50] = in[50] + out[49]
out[51] = in[51] + out[50]
out[52] = in[52] + out[51]
out[53] = in[53] + out[52]
out[54] = in[54] + out[53]
out[55] = in[55] + out[54]
out[56] = in[56] + out[55]
out[57] = in[57] + out[56]
out[58] = in[58] + out[57]
out[59] = in[59] + out[58]
out[60] = in[60] + out[59]
out[61] = in[61] + out[60]
out[62] = in[62] + out[61]
out[63] = in[63] + out[62]
out[64] = in[64] + out[63]
out[65] = in[65] + out[64]
out[66] = in[66] + out[65]
out[67] = in[67] + out[66]
out[68] = in[68] + out[67]
out[69] = in[69] + out[68]
out[70] = in[70] + out[69]
out[71] = in[71] + out[70]
out[72] = in[72] + out[71]
out[73] = in[73] + out[72]
out[74] = in[74] + out[73]
out[75] = in[75] + out[74]
out[76] = in[76] + out[75]
out[77] = in[77] + out[76]
out[78] = in[78] + out[77]
out[79] = in[79] + out[78]
out[80] = in[80] + out[79]
out[81] = in[81] + out[80]
out[82] = in[82] + out[81]
out[83] = in[83] + out[82]
out[84] = in[84] + out[83]
out[85] = in[85] + out[84]
out[86] = in[86] + out[85]
out[87] = in[87] + out[86]
out[88] = in[88] + out[87]
out[89] = in[89] + out[88]
out[90] = in[90] + out[89]
out[91] = in[91] + out[90]
out[92] = in[92] + out[91]
out[93] = in[93] + out[92]
out[94] = in[94] + out[93]
out[95] = in[95] + out[94]
out[96] = in[96] + out[95]
out[97] = in[97] + out[96]
out[98] = in[98] + out[97]
out[99] = in[99] + out[98]
out[100] = in[100] + out[99]
out[101] = in[101] + out[100]
out[102] = in[102] + out[101]
out[103] = in[103] + out[102]
out[104] = in[104] + out[103]
out[105] = in[105] + out[104]
out[106] = in[106] + out[105]
out[107] = in[107] + out[106]
out[108] = in[108] + out[107]
out[109] = in[109] + out[108]
out[110] = in[110] + out[109]
out[111] = in[111] + out[110]
out[112] = in[112] + out[111]
out[113] = in[113] + out[112]
out[114] = in[114] + out[113]
out[115] = in[115] + out[114]
out[116] = in[116] + out[115]
out[117] = in[117] + out[116]
out[118] = in[118] + out[117]
out[119] = in[119] + out[118]
out[120] = in[120] + out[119]
out[121] = in[121] + out[120]
out[122] = in[122] + out[121]
out[123] = in[123] + out[122]
out[124] = in[124] + out[123]
out[125] = in[125] + out[124]
out[126] = in[126] + out[125]
out[127] = in[127] + out[126]
}
func UnrolledLeadingBitFrequency128(in, freqs []int32) {
freqs[LeadingBitPosition(uint32(in[0]))]++
freqs[LeadingBitPosition(uint32(in[1]))]++
freqs[LeadingBitPosition(uint32(in[2]))]++
freqs[LeadingBitPosition(uint32(in[3]))]++
freqs[LeadingBitPosition(uint32(in[4]))]++
freqs[LeadingBitPosition(uint32(in[5]))]++
freqs[LeadingBitPosition(uint32(in[6]))]++
freqs[LeadingBitPosition(uint32(in[7]))]++
freqs[LeadingBitPosition(uint32(in[8]))]++
freqs[LeadingBitPosition(uint32(in[9]))]++
freqs[LeadingBitPosition(uint32(in[10]))]++
freqs[LeadingBitPosition(uint32(in[11]))]++
freqs[LeadingBitPosition(uint32(in[12]))]++
freqs[LeadingBitPosition(uint32(in[13]))]++
freqs[LeadingBitPosition(uint32(in[14]))]++
freqs[LeadingBitPosition(uint32(in[15]))]++
freqs[LeadingBitPosition(uint32(in[16]))]++
freqs[LeadingBitPosition(uint32(in[17]))]++
freqs[LeadingBitPosition(uint32(in[18]))]++
freqs[LeadingBitPosition(uint32(in[19]))]++
freqs[LeadingBitPosition(uint32(in[20]))]++
freqs[LeadingBitPosition(uint32(in[21]))]++
freqs[LeadingBitPosition(uint32(in[22]))]++
freqs[LeadingBitPosition(uint32(in[23]))]++
freqs[LeadingBitPosition(uint32(in[24]))]++
freqs[LeadingBitPosition(uint32(in[25]))]++
freqs[LeadingBitPosition(uint32(in[26]))]++
freqs[LeadingBitPosition(uint32(in[27]))]++
freqs[LeadingBitPosition(uint32(in[28]))]++
freqs[LeadingBitPosition(uint32(in[29]))]++
freqs[LeadingBitPosition(uint32(in[30]))]++
freqs[LeadingBitPosition(uint32(in[31]))]++
freqs[LeadingBitPosition(uint32(in[32]))]++
freqs[LeadingBitPosition(uint32(in[33]))]++
freqs[LeadingBitPosition(uint32(in[34]))]++
freqs[LeadingBitPosition(uint32(in[35]))]++
freqs[LeadingBitPosition(uint32(in[36]))]++
freqs[LeadingBitPosition(uint32(in[37]))]++
freqs[LeadingBitPosition(uint32(in[38]))]++
freqs[LeadingBitPosition(uint32(in[39]))]++
freqs[LeadingBitPosition(uint32(in[40]))]++
freqs[LeadingBitPosition(uint32(in[41]))]++
freqs[LeadingBitPosition(uint32(in[42]))]++
freqs[LeadingBitPosition(uint32(in[43]))]++
freqs[LeadingBitPosition(uint32(in[44]))]++
freqs[LeadingBitPosition(uint32(in[45]))]++
freqs[LeadingBitPosition(uint32(in[46]))]++
freqs[LeadingBitPosition(uint32(in[47]))]++
freqs[LeadingBitPosition(uint32(in[48]))]++
freqs[LeadingBitPosition(uint32(in[49]))]++
freqs[LeadingBitPosition(uint32(in[50]))]++
freqs[LeadingBitPosition(uint32(in[51]))]++
freqs[LeadingBitPosition(uint32(in[52]))]++
freqs[LeadingBitPosition(uint32(in[53]))]++
freqs[LeadingBitPosition(uint32(in[54]))]++
freqs[LeadingBitPosition(uint32(in[55]))]++
freqs[LeadingBitPosition(uint32(in[56]))]++
freqs[LeadingBitPosition(uint32(in[57]))]++
freqs[LeadingBitPosition(uint32(in[58]))]++
freqs[LeadingBitPosition(uint32(in[59]))]++
freqs[LeadingBitPosition(uint32(in[60]))]++
freqs[LeadingBitPosition(uint32(in[61]))]++
freqs[LeadingBitPosition(uint32(in[62]))]++
freqs[LeadingBitPosition(uint32(in[63]))]++
freqs[LeadingBitPosition(uint32(in[64]))]++
freqs[LeadingBitPosition(uint32(in[65]))]++
freqs[LeadingBitPosition(uint32(in[66]))]++
freqs[LeadingBitPosition(uint32(in[67]))]++
freqs[LeadingBitPosition(uint32(in[68]))]++
freqs[LeadingBitPosition(uint32(in[69]))]++
freqs[LeadingBitPosition(uint32(in[70]))]++
freqs[LeadingBitPosition(uint32(in[71]))]++
freqs[LeadingBitPosition(uint32(in[72]))]++
freqs[LeadingBitPosition(uint32(in[73]))]++
freqs[LeadingBitPosition(uint32(in[74]))]++
freqs[LeadingBitPosition(uint32(in[75]))]++
freqs[LeadingBitPosition(uint32(in[76]))]++
freqs[LeadingBitPosition(uint32(in[77]))]++
freqs[LeadingBitPosition(uint32(in[78]))]++
freqs[LeadingBitPosition(uint32(in[79]))]++
freqs[LeadingBitPosition(uint32(in[80]))]++
freqs[LeadingBitPosition(uint32(in[81]))]++
freqs[LeadingBitPosition(uint32(in[82]))]++
freqs[LeadingBitPosition(uint32(in[83]))]++
freqs[LeadingBitPosition(uint32(in[84]))]++
freqs[LeadingBitPosition(uint32(in[85]))]++
freqs[LeadingBitPosition(uint32(in[86]))]++
freqs[LeadingBitPosition(uint32(in[87]))]++
freqs[LeadingBitPosition(uint32(in[88]))]++
freqs[LeadingBitPosition(uint32(in[89]))]++
freqs[LeadingBitPosition(uint32(in[90]))]++
freqs[LeadingBitPosition(uint32(in[91]))]++
freqs[LeadingBitPosition(uint32(in[92]))]++
freqs[LeadingBitPosition(uint32(in[93]))]++
freqs[LeadingBitPosition(uint32(in[94]))]++
freqs[LeadingBitPosition(uint32(in[95]))]++
freqs[LeadingBitPosition(uint32(in[96]))]++
freqs[LeadingBitPosition(uint32(in[97]))]++
freqs[LeadingBitPosition(uint32(in[98]))]++
freqs[LeadingBitPosition(uint32(in[99]))]++
freqs[LeadingBitPosition(uint32(in[100]))]++
freqs[LeadingBitPosition(uint32(in[101]))]++
freqs[LeadingBitPosition(uint32(in[102]))]++
freqs[LeadingBitPosition(uint32(in[103]))]++
freqs[LeadingBitPosition(uint32(in[104]))]++
freqs[LeadingBitPosition(uint32(in[105]))]++
freqs[LeadingBitPosition(uint32(in[106]))]++
freqs[LeadingBitPosition(uint32(in[107]))]++
freqs[LeadingBitPosition(uint32(in[108]))]++
freqs[LeadingBitPosition(uint32(in[109]))]++
freqs[LeadingBitPosition(uint32(in[110]))]++
freqs[LeadingBitPosition(uint32(in[111]))]++
freqs[LeadingBitPosition(uint32(in[112]))]++
freqs[LeadingBitPosition(uint32(in[113]))]++
freqs[LeadingBitPosition(uint32(in[114]))]++
freqs[LeadingBitPosition(uint32(in[115]))]++
freqs[LeadingBitPosition(uint32(in[116]))]++
freqs[LeadingBitPosition(uint32(in[117]))]++
freqs[LeadingBitPosition(uint32(in[118]))]++
freqs[LeadingBitPosition(uint32(in[119]))]++
freqs[LeadingBitPosition(uint32(in[120]))]++
freqs[LeadingBitPosition(uint32(in[121]))]++
freqs[LeadingBitPosition(uint32(in[122]))]++
freqs[LeadingBitPosition(uint32(in[123]))]++
freqs[LeadingBitPosition(uint32(in[124]))]++
freqs[LeadingBitPosition(uint32(in[125]))]++
freqs[LeadingBitPosition(uint32(in[126]))]++
freqs[LeadingBitPosition(uint32(in[127]))]++
}