132 lines
2.9 KiB
Go
132 lines
2.9 KiB
Go
package Compression
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import (
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"github.com/OpenDiablo2/OpenDiablo2/Common"
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)
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var sLookup = []int{
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0x0007, 0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E,
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0x0010, 0x0011, 0x0013, 0x0015, 0x0017, 0x0019, 0x001C, 0x001F,
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0x0022, 0x0025, 0x0029, 0x002D, 0x0032, 0x0037, 0x003C, 0x0042,
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0x0049, 0x0050, 0x0058, 0x0061, 0x006B, 0x0076, 0x0082, 0x008F,
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0x009D, 0x00AD, 0x00BE, 0x00D1, 0x00E6, 0x00FD, 0x0117, 0x0133,
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0x0151, 0x0173, 0x0198, 0x01C1, 0x01EE, 0x0220, 0x0256, 0x0292,
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0x02D4, 0x031C, 0x036C, 0x03C3, 0x0424, 0x048E, 0x0502, 0x0583,
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0x0610, 0x06AB, 0x0756, 0x0812, 0x08E0, 0x09C3, 0x0ABD, 0x0BD0,
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0x0CFF, 0x0E4C, 0x0FBA, 0x114C, 0x1307, 0x14EE, 0x1706, 0x1954,
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0x1BDC, 0x1EA5, 0x21B6, 0x2515, 0x28CA, 0x2CDF, 0x315B, 0x364B,
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0x3BB9, 0x41B2, 0x4844, 0x4F7E, 0x5771, 0x602F, 0x69CE, 0x7462,
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0x7FFF,
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}
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var sLookup2 = []int{
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-1, 0, -1, 4, -1, 2, -1, 6,
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-1, 1, -1, 5, -1, 3, -1, 7,
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-1, 1, -1, 5, -1, 3, -1, 7,
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-1, 2, -1, 4, -1, 6, -1, 8,
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}
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func WavDecompress(data []byte, channelCount int) []byte {
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Array1 := []int{0x2c, 0x2c}
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Array2 := make([]int, channelCount)
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input := Common.CreateStreamReader(data)
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output := Common.CreateStreamWriter()
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input.GetByte()
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shift := input.GetByte()
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for i := 0; i < channelCount; i++ {
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temp := input.GetInt16()
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Array2[i] = int(temp)
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output.PushSWord(temp)
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}
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channel := channelCount - 1
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for input.GetPosition() < input.GetSize() {
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value := input.GetByte()
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if channelCount == 2 {
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channel = 1 - channel
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}
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if (value & 0x80) != 0 {
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switch value & 0x7f {
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case 0:
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if Array1[channel] != 0 {
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Array1[channel]--
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}
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output.PushSWord(int16(Array2[channel]))
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break
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case 1:
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Array1[channel] += 8
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if Array1[channel] > 0x58 {
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Array1[channel] = 0x58
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}
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if channelCount == 2 {
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channel = 1 - channel
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}
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break
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case 2:
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break
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default:
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Array1[channel] -= 8
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if Array1[channel] < 0 {
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Array1[channel] = 0
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}
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if channelCount == 2 {
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channel = 1 - channel
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}
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break
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}
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} else {
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temp1 := sLookup[Array1[channel]]
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temp2 := temp1 >> shift
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if (value & 1) != 0 {
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temp2 += temp1 >> 0
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}
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if (value & 2) != 0 {
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temp2 += temp1 >> 1
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}
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if (value & 4) != 0 {
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temp2 += temp1 >> 2
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}
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if (value & 8) != 0 {
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temp2 += temp1 >> 3
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}
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if (value & 0x10) != 0 {
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temp2 += temp1 >> 4
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}
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if (value & 0x20) != 0 {
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temp2 += temp1 >> 5
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}
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temp3 := Array2[channel]
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if (value & 0x40) != 0 {
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temp3 -= temp2
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if temp3 <= -32768 {
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temp3 = -32768
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}
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} else {
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temp3 += temp2
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if temp3 >= 32767 {
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temp3 = 32767
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}
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}
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Array2[channel] = temp3
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output.PushSWord(int16(temp3))
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Array1[channel] += sLookup2[value&0x1f]
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if Array1[channel] < 0 {
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Array1[channel] = 0
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} else {
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if Array1[channel] > 0x58 {
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Array1[channel] = 0x58
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}
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}
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}
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}
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return output.GetBytes()
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}
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