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