mirror of
https://github.com/OpenDiablo2/OpenDiablo2
synced 2024-09-30 15:15:56 -04:00
59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
// Package d2dcc contains the logic for loading and processing DCC files.
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package d2dcc
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import (
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"errors"
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"github.com/OpenDiablo2/OpenDiablo2/d2common"
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)
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const dccFileSignature = 0x74
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const directionOffsetMultiplier = 8
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// DCC represents a DCC file.
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type DCC struct {
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Signature int
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Version int
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NumberOfDirections int
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FramesPerDirection int
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Directions []*DCCDirection
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}
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// Load loads a DCC file.
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func Load(fileData []byte) (*DCC, error) {
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result := &DCC{}
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var bm = d2common.CreateBitMuncher(fileData, 0)
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result.Signature = int(bm.GetByte())
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if result.Signature != dccFileSignature {
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return nil, errors.New("signature expected to be 0x74 but it is not")
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}
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result.Version = int(bm.GetByte())
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result.NumberOfDirections = int(bm.GetByte())
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result.FramesPerDirection = int(bm.GetInt32())
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if bm.GetInt32() != 1 {
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return nil, errors.New("this value isn't 1. It has to be 1")
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}
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bm.GetInt32() // TotalSizeCoded
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directionOffsets := make([]int, result.NumberOfDirections)
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for i := 0; i < result.NumberOfDirections; i++ {
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directionOffsets[i] = int(bm.GetInt32())
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}
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result.Directions = make([]*DCCDirection, result.NumberOfDirections)
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for i := 0; i < result.NumberOfDirections; i++ {
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result.Directions[i] = CreateDCCDirection(d2common.CreateBitMuncher(
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fileData, directionOffsets[i]*directionOffsetMultiplier), result)
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}
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return result, nil
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}
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