forked from MTSR/mapserver
91 lines
1.6 KiB
Go
91 lines
1.6 KiB
Go
package mapblockparser
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import (
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"errors"
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"mapserver/coords"
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"strconv"
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)
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func Parse(data []byte, mtime int64, pos coords.MapBlockCoords) (*MapBlock, error) {
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if len(data) == 0 {
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return nil, errors.New("no data")
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}
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mapblock := NewMapblock()
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mapblock.Mtime = mtime
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mapblock.Pos = pos
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mapblock.Size = len(data)
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offset := 0
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// version
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mapblock.Version = data[0]
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//flags
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flags := data[1]
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mapblock.Underground = (flags & 0x01) == 0x01
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content_width := data[4]
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params_width := data[4]
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if content_width != 2 {
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return nil, errors.New("content_width = " + strconv.Itoa(int(content_width)))
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}
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if params_width != 2 {
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return nil, errors.New("params_width = " + strconv.Itoa(int(params_width)))
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}
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//mapdata (blocks)
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offset = 6
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//metadata
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count, err := parseMapdata(&mapblock, data[offset:])
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if err != nil {
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return nil, err
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}
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offset += count
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count, err = parseMetadata(&mapblock, data[offset:])
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if err != nil {
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return nil, err
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}
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offset += count
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//static objects
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offset++ //static objects version
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staticObjectsCount := readU16(data, offset)
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offset += 2
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for i := 0; i < staticObjectsCount; i++ {
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offset += 13
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dataSize := readU16(data, offset)
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offset += dataSize + 2
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}
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//timestamp
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offset += 4
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//mapping version
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offset++
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numMappings := readU16(data, offset)
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offset += 2
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for i := 0; i < numMappings; i++ {
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nodeId := readU16(data, offset)
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offset += 2
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nameLen := readU16(data, offset)
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offset += 2
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blockName := string(data[offset : offset+nameLen])
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offset += nameLen
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mapblock.BlockMapping[nodeId] = blockName
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}
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return &mapblock, nil
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}
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