add Unmarshal to convert TLVs to Go struct(s)

[alovak]

The bertlv.Unmarshal function allows you to unmarshal TLV data directly into Go structs using struct tags. Fields can be mapped to TLV tags using the bertlv struct tag:

type EMVData struct {
    DedicatedFileName   []byte `bertlv:"84"`
    ApplicationTemplate struct {
        ApplicationID                string `bertlv:"4F"`       // Will be converted to HEX string
        ApplicationLabel             string `bertlv:"50,ascii"` // Will be converted to ASCII string
        ApplicationPriorityIndicator []byte `bertlv:"87"`
    } `bertlv:"61"`
}

data := []bertlv.TLV{...} // Your TLV data
var emvData EMVData
err := bertlv.Unmarshal(data, &emvData)

// emvData.ApplicationTemplate.ApplicationID => "A0000000041010"
// emvData.ApplicationTemplate.ApplicationLabel => "Mastercard"
// emvData.ApplicationTemplate.ApplicationPriorityIndicator => []byte{0x.01}