59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
package d2dcc
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import (
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"errors"
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"github.com/OpenDiablo2/OpenDiablo2/d2common/d2datautils"
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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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directionOffsets []int
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fileData []byte
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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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fileData: fileData,
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}
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var bm = d2datautils.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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result.directionOffsets = make([]int, result.NumberOfDirections)
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for i := 0; i < result.NumberOfDirections; i++ {
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result.directionOffsets[i] = int(bm.GetInt32())
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}
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return result, nil
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}
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// DecodeDirection decodes and returns the given direction
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func (dcc *DCC) DecodeDirection(direction int) *DCCDirection {
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return CreateDCCDirection(d2datautils.CreateBitMuncher(dcc.fileData,
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dcc.directionOffsets[direction]*directionOffsetMultiplier), dcc)
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}
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