83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
package raylib
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import (
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"encoding/binary"
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"io"
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"os"
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"unsafe"
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"github.com/gen2brain/raylib-go/rres"
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"github.com/gen2brain/raylib-go/rres/rreslib"
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)
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// LoadResource - Load resource from file by id
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// NOTE: Returns uncompressed data with parameters, search resource by id
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func LoadResource(reader io.ReadSeeker, rresID int, key []byte) (data rres.Data) {
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var fileHeader rres.FileHeader
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var infoHeader rres.InfoHeader
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reader.Seek(0, 0)
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// Read rres file header
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err := binary.Read(reader, binary.LittleEndian, &fileHeader)
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if err != nil {
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TraceLog(LogWarning, err.Error())
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return
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}
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// Verify "rRES" identifier
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if string(fileHeader.ID[:]) != "rRES" {
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TraceLog(LogWarning, "not a valid raylib resource file")
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return
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}
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reader.Seek(int64(unsafe.Sizeof(fileHeader)), os.SEEK_CUR)
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for i := 0; i < int(fileHeader.Count); i++ {
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// Read resource info and parameters
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err = binary.Read(reader, binary.LittleEndian, &infoHeader)
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if err != nil {
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TraceLog(LogWarning, err.Error())
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return
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}
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reader.Seek(int64(unsafe.Sizeof(infoHeader)), os.SEEK_CUR)
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if int(infoHeader.ID) == rresID {
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data.Type = uint32(infoHeader.DataType)
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data.Param1 = infoHeader.Param1
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data.Param2 = infoHeader.Param2
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data.Param3 = infoHeader.Param3
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data.Param4 = infoHeader.Param4
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// Read resource data block
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b := make([]byte, infoHeader.DataSize)
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reader.Read(b)
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// Decompress data
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data.Data, err = rreslib.Decompress(b, int(infoHeader.CompType))
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if err != nil {
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TraceLog(LogWarning, "[ID %d] %v", infoHeader.ID, err)
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}
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// Decrypt data
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data.Data, err = rreslib.Decrypt(key, data.Data, int(infoHeader.CryptoType))
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if err != nil {
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TraceLog(LogWarning, "[ID %d] %v", infoHeader.ID, err)
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}
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if data.Data != nil && len(data.Data) == int(infoHeader.UncompSize) {
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TraceLog(LogInfo, "[ID %d] Resource data loaded successfully", infoHeader.ID)
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}
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} else {
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// Skip required data to read next resource infoHeader
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reader.Seek(int64(infoHeader.DataSize), os.SEEK_CUR)
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}
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}
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if data.Data == nil {
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TraceLog(LogWarning, "[ID %d] Requested resource could not be found", rresID)
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}
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return
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}
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