413 lines
16 KiB
Go
413 lines
16 KiB
Go
// Package d2compression is used for decompressing WAV files.
|
|
package d2compression
|
|
|
|
// MpqHuffman.go based on the original CS file
|
|
//
|
|
// Authors:
|
|
// Foole (fooleau@gmail.com)
|
|
// Tim Sarbin (tim.sarbin@gmail.com) (go translation)
|
|
//
|
|
// (C) 2006 Foole (fooleau@gmail.com)
|
|
// Based on code from StormLib by Ladislav Zezula and ShadowFlare
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining
|
|
// a copy of this software and associated documentation files (the
|
|
// "Software"), to deal in the Software without restriction, including
|
|
// without limitation the rights to use, copy, modify, merge, publish,
|
|
// distribute, sublicense, and/or sell copies of the Software, and to
|
|
// permit persons to whom the Software is furnished to do so, subject to
|
|
// the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be
|
|
// included in all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
//
|
|
|
|
import (
|
|
"log"
|
|
|
|
"github.com/OpenDiablo2/OpenDiablo2/d2common/d2datautils"
|
|
)
|
|
|
|
// linkedNode is a node which is both hierachcical (parent/child) and doubly linked (next/prev)
|
|
type linkedNode struct {
|
|
decompressedValue int
|
|
weight int
|
|
parent *linkedNode
|
|
child0 *linkedNode
|
|
prev *linkedNode
|
|
next *linkedNode
|
|
}
|
|
|
|
// createLinkedNode creates a linked node
|
|
func createLinkedNode(decompVal, weight int) *linkedNode {
|
|
result := &linkedNode{
|
|
decompressedValue: decompVal,
|
|
weight: weight,
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
func (v *linkedNode) getChild1() *linkedNode {
|
|
return v.child0.prev
|
|
}
|
|
|
|
func (v *linkedNode) insert(other *linkedNode) *linkedNode {
|
|
// 'next' should have a lower weight we should return the lower weight
|
|
if other.weight <= v.weight {
|
|
// insert before
|
|
if v.next != nil {
|
|
v.next.prev = other
|
|
other.next = v.next
|
|
}
|
|
|
|
v.next = other
|
|
|
|
other.prev = v
|
|
|
|
return other
|
|
}
|
|
|
|
if v.prev == nil {
|
|
// insert after
|
|
other.prev = nil
|
|
v.prev = other
|
|
other.next = v
|
|
} else {
|
|
v.prev.insert(other)
|
|
}
|
|
|
|
return v
|
|
}
|
|
|
|
//nolint:funlen // Makes no sense to split
|
|
func getPrimes() [][]byte {
|
|
return [][]byte{
|
|
{ //nolint:dupl we're not interested in duplicates here
|
|
// Compression type 0
|
|
0x0A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
|
|
},
|
|
{ //nolint:dupl we're not interested in duplicates here
|
|
// Compression type 1
|
|
0x54, 0x16, 0x16, 0x0D, 0x0C, 0x08, 0x06, 0x05, 0x06, 0x05, 0x06, 0x03, 0x04, 0x04, 0x03, 0x05,
|
|
0x0E, 0x0B, 0x14, 0x13, 0x13, 0x09, 0x0B, 0x06, 0x05, 0x04, 0x03, 0x02, 0x03, 0x02, 0x02, 0x02,
|
|
0x0D, 0x07, 0x09, 0x06, 0x06, 0x04, 0x03, 0x02, 0x04, 0x03, 0x03, 0x03, 0x03, 0x03, 0x02, 0x02,
|
|
0x09, 0x06, 0x04, 0x04, 0x04, 0x04, 0x03, 0x02, 0x03, 0x02, 0x02, 0x02, 0x02, 0x03, 0x02, 0x04,
|
|
0x08, 0x03, 0x04, 0x07, 0x09, 0x05, 0x03, 0x03, 0x03, 0x03, 0x02, 0x02, 0x02, 0x03, 0x02, 0x02,
|
|
0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x02, 0x01, 0x02, 0x02,
|
|
0x06, 0x0A, 0x08, 0x08, 0x06, 0x07, 0x04, 0x03, 0x04, 0x04, 0x02, 0x02, 0x04, 0x02, 0x03, 0x03,
|
|
0x04, 0x03, 0x07, 0x07, 0x09, 0x06, 0x04, 0x03, 0x03, 0x02, 0x01, 0x02, 0x02, 0x02, 0x02, 0x02,
|
|
0x0A, 0x02, 0x02, 0x03, 0x02, 0x02, 0x01, 0x01, 0x02, 0x02, 0x02, 0x06, 0x03, 0x05, 0x02, 0x03,
|
|
0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x03, 0x01, 0x01, 0x01,
|
|
0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x04, 0x04, 0x04, 0x07, 0x09, 0x08, 0x0C, 0x02,
|
|
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x03,
|
|
0x04, 0x01, 0x02, 0x04, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01,
|
|
0x04, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
|
|
0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
|
|
0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x01, 0x01, 0x02, 0x02, 0x02, 0x06, 0x4B,
|
|
}, {
|
|
// Compression type 2 //nolint:dupl
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x27, 0x00, 0x00, 0x23, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0xFF, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x01, 0x01, 0x06, 0x0E, 0x10, 0x04,
|
|
0x06, 0x08, 0x05, 0x04, 0x04, 0x03, 0x03, 0x02, 0x02, 0x03, 0x03, 0x01, 0x01, 0x02, 0x01, 0x01,
|
|
0x01, 0x04, 0x02, 0x04, 0x02, 0x02, 0x02, 0x01, 0x01, 0x04, 0x01, 0x01, 0x02, 0x03, 0x03, 0x02,
|
|
0x03, 0x01, 0x03, 0x06, 0x04, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x02, 0x01, 0x01,
|
|
0x01, 0x29, 0x07, 0x16, 0x12, 0x40, 0x0A, 0x0A, 0x11, 0x25, 0x01, 0x03, 0x17, 0x10, 0x26, 0x2A,
|
|
0x10, 0x01, 0x23, 0x23, 0x2F, 0x10, 0x06, 0x07, 0x02, 0x09, 0x01, 0x01, 0x01, 0x01, 0x01,
|
|
}, { //nolint:dupl we're not interested in duplicates here
|
|
// Compression type 3 //nolint:dupl
|
|
0xFF, 0x0B, 0x07, 0x05, 0x0B, 0x02, 0x02, 0x02, 0x06, 0x02, 0x02, 0x01, 0x04, 0x02, 0x01, 0x03,
|
|
0x09, 0x01, 0x01, 0x01, 0x03, 0x04, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01,
|
|
0x05, 0x01, 0x01, 0x01, 0x0D, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
|
|
0x02, 0x01, 0x01, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01, 0x01,
|
|
0x0A, 0x04, 0x02, 0x01, 0x06, 0x03, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x01,
|
|
0x05, 0x02, 0x03, 0x04, 0x03, 0x03, 0x03, 0x02, 0x01, 0x01, 0x01, 0x02, 0x01, 0x02, 0x03, 0x03,
|
|
0x01, 0x03, 0x01, 0x01, 0x02, 0x05, 0x01, 0x01, 0x04, 0x03, 0x05, 0x01, 0x03, 0x01, 0x03, 0x03,
|
|
0x02, 0x01, 0x04, 0x03, 0x0A, 0x06, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
|
|
0x02, 0x02, 0x01, 0x0A, 0x02, 0x05, 0x01, 0x01, 0x02, 0x07, 0x02, 0x17, 0x01, 0x05, 0x01, 0x01,
|
|
0x0E, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
|
|
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
|
|
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
|
|
0x06, 0x02, 0x01, 0x04, 0x05, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01,
|
|
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
|
|
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x07, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01, 0x01,
|
|
0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x11,
|
|
}, { // Compression type 4 //nolint:dupl
|
|
0xFF, 0xFB, 0x98, 0x9A, 0x84, 0x85, 0x63, 0x64, 0x3E, 0x3E, 0x22, 0x22, 0x13, 0x13, 0x18, 0x17,
|
|
}, { // Compression type 5 //nolint:dupl
|
|
0xFF, 0xF1, 0x9D, 0x9E, 0x9A, 0x9B, 0x9A, 0x97, 0x93, 0x93, 0x8C, 0x8E, 0x86, 0x88, 0x80, 0x82,
|
|
0x7C, 0x7C, 0x72, 0x73, 0x69, 0x6B, 0x5F, 0x60, 0x55, 0x56, 0x4A, 0x4B, 0x40, 0x41, 0x37, 0x37,
|
|
0x2F, 0x2F, 0x27, 0x27, 0x21, 0x21, 0x1B, 0x1C, 0x17, 0x17, 0x13, 0x13, 0x10, 0x10, 0x0D, 0x0D,
|
|
0x0B, 0x0B, 0x09, 0x09, 0x08, 0x08, 0x07, 0x07, 0x06, 0x05, 0x05, 0x04, 0x04, 0x04, 0x19, 0x18,
|
|
}, { //nolint:dupl we're not interested in duplicates here
|
|
// Compression type 6
|
|
0xC3, 0xCB, 0xF5, 0x41, 0xFF, 0x7B, 0xF7, 0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0xBF, 0xCC, 0xF2, 0x40, 0xFD, 0x7C, 0xF7, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x7A, 0x46,
|
|
}, { //nolint:dupl we're not interested in duplicates here
|
|
// Compression type 7
|
|
0xC3, 0xD9, 0xEF, 0x3D, 0xF9, 0x7C, 0xE9, 0x1E, 0xFD, 0xAB, 0xF1, 0x2C, 0xFC, 0x5B, 0xFE, 0x17,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0xBD, 0xD9, 0xEC, 0x3D, 0xF5, 0x7D, 0xE8, 0x1D, 0xFB, 0xAE, 0xF0, 0x2C, 0xFB, 0x5C, 0xFF, 0x18,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x70, 0x6C,
|
|
}, { // Compression type 8
|
|
0xBA, 0xC5, 0xDA, 0x33, 0xE3, 0x6D, 0xD8, 0x18, 0xE5, 0x94, 0xDA, 0x23, 0xDF, 0x4A, 0xD1, 0x10,
|
|
0xEE, 0xAF, 0xE4, 0x2C, 0xEA, 0x5A, 0xDE, 0x15, 0xF4, 0x87, 0xE9, 0x21, 0xF6, 0x43, 0xFC, 0x12,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0xB0, 0xC7, 0xD8, 0x33, 0xE3, 0x6B, 0xD6, 0x18, 0xE7, 0x95, 0xD8, 0x23, 0xDB, 0x49, 0xD0, 0x11,
|
|
0xE9, 0xB2, 0xE2, 0x2B, 0xE8, 0x5C, 0xDD, 0x15, 0xF1, 0x87, 0xE7, 0x20, 0xF7, 0x44, 0xFF, 0x13,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x5F, 0x9E,
|
|
},
|
|
}
|
|
}
|
|
|
|
func decode(input *d2datautils.BitStream, head *linkedNode) *linkedNode {
|
|
node := head
|
|
|
|
for node.child0 != nil {
|
|
bit := input.ReadBits(1)
|
|
if bit == -1 {
|
|
log.Fatal("unexpected end of file")
|
|
}
|
|
|
|
if bit == 0 {
|
|
node = node.child0
|
|
continue
|
|
}
|
|
|
|
node = node.getChild1()
|
|
}
|
|
|
|
return node
|
|
}
|
|
|
|
const (
|
|
decompVal1 = 256
|
|
decompVal2 = 257
|
|
)
|
|
|
|
func buildList(primeData []byte) *linkedNode {
|
|
root := createLinkedNode(decompVal1, 1)
|
|
root = root.insert(createLinkedNode(decompVal2, 1))
|
|
|
|
for i := 0; i < len(primeData); i++ {
|
|
if primeData[i] != 0 {
|
|
root = root.insert(createLinkedNode(i, int(primeData[i])))
|
|
}
|
|
}
|
|
|
|
return root
|
|
}
|
|
|
|
func insertNode(tail *linkedNode, decomp int) *linkedNode {
|
|
parent := tail
|
|
result := tail.prev // This will be the new tail after the tree is updated
|
|
|
|
temp := createLinkedNode(parent.decompressedValue, parent.weight)
|
|
temp.parent = parent
|
|
|
|
newnode := createLinkedNode(decomp, 0)
|
|
newnode.parent = parent
|
|
|
|
parent.child0 = newnode
|
|
|
|
tail.next = temp
|
|
temp.prev = tail
|
|
newnode.prev = temp
|
|
temp.next = newnode
|
|
|
|
adjustTree(newnode)
|
|
|
|
// ISSUE #680: For compression type 0, adjustTree should be
|
|
// called once for every value written and only once here
|
|
adjustTree(newnode)
|
|
|
|
return result
|
|
}
|
|
|
|
// This increases the weight of the new node and its antecendants
|
|
// and adjusts the tree if needed
|
|
func adjustTree(newNode *linkedNode) {
|
|
current := newNode
|
|
|
|
for current != nil {
|
|
current.weight++
|
|
|
|
var insertpoint *linkedNode
|
|
|
|
var prev *linkedNode
|
|
|
|
// Go backwards thru the list looking for the insertion point
|
|
insertpoint = current
|
|
|
|
for {
|
|
prev = insertpoint.prev
|
|
if prev == nil {
|
|
break
|
|
}
|
|
|
|
if prev.weight >= current.weight {
|
|
break
|
|
}
|
|
|
|
insertpoint = prev
|
|
}
|
|
|
|
// No insertion point found
|
|
if insertpoint == current {
|
|
current = current.parent
|
|
continue
|
|
}
|
|
|
|
// The following code basically swaps insertpoint with current
|
|
|
|
// remove insert point
|
|
if insertpoint.prev != nil {
|
|
insertpoint.prev.next = insertpoint.next
|
|
}
|
|
|
|
insertpoint.next.prev = insertpoint.prev
|
|
|
|
// insert insertpoint after current
|
|
insertpoint.next = current.next
|
|
insertpoint.prev = current
|
|
|
|
if current.next != nil {
|
|
current.next.prev = insertpoint
|
|
}
|
|
|
|
current.next = insertpoint
|
|
|
|
// remove current
|
|
current.prev.next = current.next
|
|
current.next.prev = current.prev
|
|
|
|
// insert current after prev
|
|
if prev == nil {
|
|
log.Fatal("previous frame not defined!")
|
|
}
|
|
|
|
temp := prev.next
|
|
current.next = temp
|
|
current.prev = prev
|
|
temp.prev = current
|
|
prev.next = current
|
|
|
|
// Set up parent/child links
|
|
currentparent := current.parent
|
|
insertparent := insertpoint.parent
|
|
|
|
if currentparent.child0 == current {
|
|
currentparent.child0 = insertpoint
|
|
}
|
|
|
|
if currentparent != insertparent && insertparent.child0 == insertpoint {
|
|
insertparent.child0 = current
|
|
}
|
|
|
|
current.parent = insertparent
|
|
insertpoint.parent = currentparent
|
|
|
|
current = current.parent
|
|
}
|
|
}
|
|
|
|
func buildTree(tail *linkedNode) *linkedNode {
|
|
current := tail
|
|
|
|
for current != nil {
|
|
child0 := current
|
|
child1 := current.prev
|
|
|
|
if child1 == nil {
|
|
break
|
|
}
|
|
|
|
parent := createLinkedNode(0, child0.weight+child1.weight)
|
|
parent.child0 = child0
|
|
child0.parent = parent
|
|
child1.parent = parent
|
|
|
|
current.insert(parent)
|
|
current = current.prev.prev
|
|
}
|
|
|
|
return current
|
|
}
|
|
|
|
// HuffmanDecompress decompresses huffman-compressed data
|
|
//nolint:gomnd // binary decode magic
|
|
func HuffmanDecompress(data []byte) []byte {
|
|
comptype := data[0]
|
|
primes := getPrimes()
|
|
|
|
if comptype == 0 {
|
|
log.Panic("compression type 0 is not currently supported")
|
|
}
|
|
|
|
tail := buildList(primes[comptype])
|
|
head := buildTree(tail)
|
|
|
|
outputstream := d2datautils.CreateStreamWriter()
|
|
bitstream := d2datautils.CreateBitStream(data[1:])
|
|
|
|
var decoded int
|
|
|
|
Loop:
|
|
for {
|
|
node := decode(bitstream, head)
|
|
decoded = node.decompressedValue
|
|
switch decoded {
|
|
case 256:
|
|
break Loop
|
|
case 257:
|
|
newvalue := bitstream.ReadBits(8)
|
|
|
|
outputstream.PushByte(byte(newvalue))
|
|
tail = insertNode(tail, newvalue)
|
|
default:
|
|
outputstream.PushByte(byte(decoded))
|
|
}
|
|
}
|
|
|
|
return outputstream.GetBytes()
|
|
}
|