112 lines
2.9 KiB
Go
112 lines
2.9 KiB
Go
package d2dt1
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import (
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"fmt"
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"github.com/OpenDiablo2/OpenDiablo2/d2common"
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)
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// DT1 represents a DT1 file.
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type DT1 struct {
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Tiles []Tile
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}
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// BlockDataFormat represents the format of the block data
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type BlockDataFormat int16
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const (
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// BlockFormatRLE specifies the block format is RLE encoded
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BlockFormatRLE BlockDataFormat = 0
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// BlockFormatIsometric specifies the block format isometrically encoded
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BlockFormatIsometric BlockDataFormat = 1
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)
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// LoadDT1 loads a DT1 record
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//nolint:funlen Can't reduce
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func LoadDT1(fileData []byte) (*DT1, error) {
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result := &DT1{}
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br := d2common.CreateStreamReader(fileData)
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ver1 := br.GetInt32()
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ver2 := br.GetInt32()
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if ver1 != 7 || ver2 != 6 {
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return nil, fmt.Errorf("expected to have a version of 7.6, but got %d.%d instead", ver1, ver2)
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}
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br.SkipBytes(260) //nolint:gomnd // Unknown data
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numberOfTiles := br.GetInt32()
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br.SetPosition(uint64(br.GetInt32()))
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result.Tiles = make([]Tile, numberOfTiles)
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for tileIdx := range result.Tiles {
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newTile := Tile{}
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newTile.Direction = br.GetInt32()
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newTile.RoofHeight = br.GetInt16()
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newTile.MaterialFlags = NewMaterialFlags(br.GetUInt16())
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newTile.Height = br.GetInt32()
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newTile.Width = br.GetInt32()
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br.SkipBytes(4) //nolint:gomnd // Unknown data
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newTile.Type = br.GetInt32()
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newTile.Style = br.GetInt32()
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newTile.Sequence = br.GetInt32()
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newTile.RarityFrameIndex = br.GetInt32()
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br.SkipBytes(4) //nolint:gomnd // Unknown data
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for i := range newTile.SubTileFlags {
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newTile.SubTileFlags[i] = NewSubTileFlags(br.GetByte())
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}
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br.SkipBytes(7) //nolint:gomnd // Unknown data
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newTile.blockHeaderPointer = br.GetInt32()
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newTile.blockHeaderSize = br.GetInt32()
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newTile.Blocks = make([]Block, br.GetInt32())
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br.SkipBytes(12) //nolint:gomnd // Unknown data
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result.Tiles[tileIdx] = newTile
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}
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for tileIdx := range result.Tiles {
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tile := &result.Tiles[tileIdx]
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br.SetPosition(uint64(tile.blockHeaderPointer))
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for blockIdx := range tile.Blocks {
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result.Tiles[tileIdx].Blocks[blockIdx].X = br.GetInt16()
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result.Tiles[tileIdx].Blocks[blockIdx].Y = br.GetInt16()
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br.SkipBytes(2) //nolint:gomnd // Unknown data
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result.Tiles[tileIdx].Blocks[blockIdx].GridX = br.GetByte()
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result.Tiles[tileIdx].Blocks[blockIdx].GridY = br.GetByte()
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formatValue := br.GetInt16()
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if formatValue == 1 {
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result.Tiles[tileIdx].Blocks[blockIdx].Format = BlockFormatIsometric
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} else {
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result.Tiles[tileIdx].Blocks[blockIdx].Format = BlockFormatRLE
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}
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result.Tiles[tileIdx].Blocks[blockIdx].Length = br.GetInt32()
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br.SkipBytes(2) //nolint:gomnd // Unknown data
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result.Tiles[tileIdx].Blocks[blockIdx].FileOffset = br.GetInt32()
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}
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for blockIndex, block := range tile.Blocks {
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br.SetPosition(uint64(tile.blockHeaderPointer + block.FileOffset))
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encodedData := br.ReadBytes(int(block.Length))
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tile.Blocks[blockIndex].EncodedData = encodedData
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}
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}
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return result, nil
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}
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