Function FindMethod

rEFIt_UEFI/Platform/FixBiosDsdt.cpp:1360–1373

if (!FindMethod(dsdt, len, "DTGP")) return address of size field. Assume size not more then 0x0FFF = 4095 bytes assuming only short methods

// return address of size field. Assume size not more then 0x0FFF = 4095 bytes
//assuming only short methods
UINT32 FindMethod (UINT8 *dsdt, UINT32 len, CONST CHAR8* Name)
{
  UINT32 i;
  for (i = 0; len >= 7 && i < len - 7; i++) {
    if (((dsdt[i] == 0x14) || (dsdt[i+1] == 0x14) || (i>0 && dsdt[i-1] == 0x14)) &&
        (dsdt[i+3] == Name[0]) && (dsdt[i+4] == Name[1]) &&
        (dsdt[i+5] == Name[2]) && (dsdt[i+6] == Name[3])
        ){
      if (i>0 && dsdt[i-1] == 0x14) return i;
      return (dsdt[i+1] == 0x14)?(i+2):(i+1); //pointer to size field
    }
  }
  return 0;
}

//this procedure corrects size of outer method. Embedded methods is not proposed
// adr - a place of changes