[mirror_edk2.git] / MdePkg / Library / BaseLib / String.c

/** @file\r
  Unicode and ASCII string primatives.\r
\r
  Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
//\r
// Include common header file for this module.\r
//\r
\r
\r
#include "BaseLibInternals.h"\r
\r
/**\r
  Copies one Null-terminated Unicode string to another Null-terminated Unicode\r
  string and returns the new Unicode string.\r
\r
  This function copies the contents of the Unicode string Source to the Unicode\r
  string Destination, and returns Destination. If Source and Destination\r
  overlap, then the results are undefined.\r
\r
  If Destination is NULL, then ASSERT().\r
  If Destination is not aligned on a 16-bit boundary, then ASSERT().\r
  If Source is NULL, then ASSERT().\r
  If Source is not aligned on a 16-bit boundary, then ASSERT().\r
  If Source and Destination overlap, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and Source contains more than\r
  PcdMaximumUnicodeStringLength Unicode characters not including the \r
  Null-terminator, then ASSERT().\r
\r
  @param  Destination Pointer to a Null-terminated Unicode string.\r
  @param  Source      Pointer to a Null-terminated Unicode string.\r
\r
  @return Destiantion\r
\r
**/\r
CHAR16 *\r
EFIAPI\r
StrCpy (\r
  OUT     CHAR16                    *Destination,\r
  IN      CONST CHAR16              *Source\r
  )\r
{\r
  CHAR16                            *ReturnValue;\r
\r
  //\r
  // Destination cannot be NULL\r
  //\r
  ASSERT (Destination != NULL);\r
  ASSERT (((UINTN) Destination & 0x01) == 0);\r
\r
  //\r
  // Destination and source cannot overlap\r
  //\r
  ASSERT ((UINTN)(Destination - Source) > StrLen (Source));\r
  ASSERT ((UINTN)(Source - Destination) > StrLen (Source));\r
\r
  ReturnValue = Destination;\r
  while (*Source) {\r
    *(Destination++) = *(Source++);\r
  }\r
  *Destination = 0;\r
  return ReturnValue;\r
}\r
\r
/**\r
  Copies one Null-terminated Unicode string with a maximum length to another\r
  Null-terminated Unicode string with a maximum length and returns the new\r
  Unicode string.\r
\r
  This function copies the contents of the Unicode string Source to the Unicode\r
  string Destination, and returns Destination. At most, Length Unicode\r
  characters are copied from Source to Destination. If Length is 0, then\r
  Destination is returned unmodified. If Length is greater that the number of\r
  Unicode characters in Source, then Destination is padded with Null Unicode\r
  characters. If Source and Destination overlap, then the results are\r
  undefined.\r
\r
  If Length > 0 and Destination is NULL, then ASSERT().\r
  If Length > 0 and Destination is not aligned on a 16-bit boundary, then ASSERT().\r
  If Length > 0 and Source is NULL, then ASSERT().\r
  If Length > 0 and Source is not aligned on a 16-bit bounadry, then ASSERT().\r
  If Source and Destination overlap, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and Source contains more than\r
  PcdMaximumUnicodeStringLength Unicode characters not including the \r
  Null-terminator, then ASSERT().\r
\r
  @param  Destination Pointer to a Null-terminated Unicode string.\r
  @param  Source      Pointer to a Null-terminated Unicode string.\r
  @param  Length      Maximum number of Unicode characters to copy.\r
\r
  @return Destination\r
\r
**/\r
CHAR16 *\r
EFIAPI\r
StrnCpy (\r
  OUT     CHAR16                    *Destination,\r
  IN      CONST CHAR16              *Source,\r
  IN      UINTN                     Length\r
  )\r
{\r
  CHAR16                            *ReturnValue;\r
\r
  if (Length == 0) {\r
    return Destination;\r
  }\r
\r
  //\r
  // Destination cannot be NULL if Length is not zero\r
  //\r
  ASSERT (Destination != NULL);\r
  ASSERT (((UINTN) Destination & 0x01) == 0);\r
\r
  //\r
  // Destination and source cannot overlap\r
  // Q: Does Source have to be NULL-terminated?\r
  //\r
  ASSERT ((UINTN)(Destination - Source) > StrLen (Source));\r
  ASSERT ((UINTN)(Source - Destination) >= Length);\r
\r
  ReturnValue = Destination;\r
\r
  while ((*Source != L'\0') && (Length > 0)) {\r
    *(Destination++) = *(Source++);\r
    Length--;\r
  }\r
\r
  ZeroMem (Destination, Length * sizeof (*Destination));\r
  return ReturnValue;\r
}\r
\r
/**\r
  Returns the length of a Null-terminated Unicode string.\r
\r
  This function returns the number of Unicode characters in the Null-terminated\r
  Unicode string specified by String.\r
\r
  If String is NULL, then ASSERT().\r
  If String is not aligned on a 16-bit boundary, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and String contains more than\r
  PcdMaximumUnicodeStringLength Unicode characters not including the \r
  Null-terminator, then ASSERT().\r
\r
  @param  String  Pointer to a Null-terminated Unicode string.\r
\r
  @return The length of String.\r
\r
**/\r
UINTN\r
EFIAPI\r
StrLen (\r
  IN      CONST CHAR16              *String\r
  )\r
{\r
  UINTN                             Length;\r
\r
  ASSERT (String != NULL);\r
  ASSERT (((UINTN) String & 0x01) == 0);\r
\r
  for (Length = 0; *String != L'\0'; String++, Length++) {\r
    //\r
    // If PcdMaximumUnicodeStringLength is not zero,\r
    // length should not more than PcdMaximumUnicodeStringLength\r
    //\r
    if (PcdGet32 (PcdMaximumUnicodeStringLength) != 0) {\r
      ASSERT (Length < PcdGet32 (PcdMaximumUnicodeStringLength));\r
    }\r
  }\r
  return Length;\r
}\r
\r
/**\r
  Returns the size of a Null-terminated Unicode string in bytes, including the\r
  Null terminator.\r
\r
  This function returns the size, in bytes, of the Null-terminated Unicode\r
  string specified by String.\r
\r
  If String is NULL, then ASSERT().\r
  If String is not aligned on a 16-bit boundary, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and String contains more than\r
  PcdMaximumUnicodeStringLength Unicode characters not including the \r
  Null-terminator, then ASSERT().\r
\r
  @param  String  Pointer to a Null-terminated Unicode string.\r
\r
  @return The size of String.\r
\r
**/\r
UINTN\r
EFIAPI\r
StrSize (\r
  IN      CONST CHAR16              *String\r
  )\r
{\r
  return (StrLen (String) + 1) * sizeof (*String);\r
}\r
\r
/**\r
  Compares two Null-terminated Unicode strings, and returns the difference\r
  between the first mismatched Unicode characters.\r
\r
  This function compares the Null-terminated Unicode string FirstString to the\r
  Null-terminated Unicode string SecondString. If FirstString is identical to\r
  SecondString, then 0 is returned. Otherwise, the value returned is the first\r
  mismatched Unicode character in SecondString subtracted from the first\r
  mismatched Unicode character in FirstString.\r
\r
  If FirstString is NULL, then ASSERT().\r
  If FirstString is not aligned on a 16-bit boundary, then ASSERT().\r
  If SecondString is NULL, then ASSERT().\r
  If SecondString is not aligned on a 16-bit boundary, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and FirstString contains more\r
  than PcdMaximumUnicodeStringLength Unicode characters not including the \r
  Null-terminator, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and SecondString contains more\r
  than PcdMaximumUnicodeStringLength Unicode characters not including the \r
  Null-terminator, then ASSERT().\r
\r
  @param  FirstString   Pointer to a Null-terminated Unicode string.\r
  @param  SecondString  Pointer to a Null-terminated Unicode string.\r
\r
  @retval 0   FirstString is identical to SecondString.\r
  @retval !=0 FirstString is not identical to SecondString.\r
\r
**/\r
INTN\r
EFIAPI\r
StrCmp (\r
  IN      CONST CHAR16              *FirstString,\r
  IN      CONST CHAR16              *SecondString\r
  )\r
{\r
  //\r
  // ASSERT both strings are less long than PcdMaximumUnicodeStringLength\r
  //\r
  ASSERT (StrSize (FirstString) != 0);\r
  ASSERT (StrSize (SecondString) != 0);\r
\r
  while ((*FirstString != L'\0') && (*FirstString == *SecondString)) {\r
    FirstString++;\r
    SecondString++;\r
  }\r
  return *FirstString - *SecondString;\r
}\r
\r
/**\r
  Compares two Null-terminated Unicode strings with maximum lengths, and\r
  returns the difference between the first mismatched Unicode characters.\r
\r
  This function compares the Null-terminated Unicode string FirstString to the\r
  Null-terminated Unicode string SecondString. At most, Length Unicode\r
  characters will be compared. If Length is 0, then 0 is returned. If\r
  FirstString is identical to SecondString, then 0 is returned. Otherwise, the\r
  value returned is the first mismatched Unicode character in SecondString\r
  subtracted from the first mismatched Unicode character in FirstString.\r
\r
  If Length > 0 and FirstString is NULL, then ASSERT().\r
  If Length > 0 and FirstString is not aligned on a 16-bit bounadary, then ASSERT().\r
  If Length > 0 and SecondString is NULL, then ASSERT().\r
  If Length > 0 and SecondString is not aligned on a 16-bit bounadary, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and FirstString contains more\r
  than PcdMaximumUnicodeStringLength Unicode characters not including the\r
  Null-terminator, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and SecondString contains more\r
  than PcdMaximumUnicodeStringLength Unicode characters not including the\r
  Null-terminator, then ASSERT().\r
\r
  @param  FirstString   Pointer to a Null-terminated Unicode string.\r
  @param  SecondString  Pointer to a Null-terminated Unicode string.\r
  @param  Length        Maximum number of Unicode characters to compare.\r
\r
  @retval 0   FirstString is identical to SecondString.\r
  @retval !=0 FirstString is not identical to SecondString.\r
\r
**/\r
INTN\r
EFIAPI\r
StrnCmp (\r
  IN      CONST CHAR16              *FirstString,\r
  IN      CONST CHAR16              *SecondString,\r
  IN      UINTN                     Length\r
  )\r
{\r
  if (Length == 0) {\r
    return 0;\r
  }\r
\r
  //\r
  // ASSERT both strings are less long than PcdMaximumUnicodeStringLength.\r
  // Length tests are performed inside StrLen().\r
  //\r
  ASSERT (StrSize (FirstString) != 0);\r
  ASSERT (StrSize (SecondString) != 0);\r
\r
  while ((*FirstString != L'\0') &&\r
         (*FirstString == *SecondString) &&\r
         (Length > 1)) {\r
    FirstString++;\r
    SecondString++;\r
    Length--;\r
  }\r
\r
  return *FirstString - *SecondString;\r
}\r
\r
/**\r
  Concatenates one Null-terminated Unicode string to another Null-terminated\r
  Unicode string, and returns the concatenated Unicode string.\r
\r
  This function concatenates two Null-terminated Unicode strings. The contents\r
  of Null-terminated Unicode string Source are concatenated to the end of\r
  Null-terminated Unicode string Destination. The Null-terminated concatenated\r
  Unicode String is returned. If Source and Destination overlap, then the\r
  results are undefined.\r
\r
  If Destination is NULL, then ASSERT().\r
  If Source is NULL, then ASSERT().\r
  If Source and Destination overlap, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and Destination contains more\r
  than PcdMaximumUnicodeStringLength Unicode characters not including the\r
  Null-terminator, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and Source contains more than\r
  PcdMaximumUnicodeStringLength Unicode characters not including the\r
  Null-terminator, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and concatenating Destination\r
  and Source results in a Unicode string with more than\r
  PcdMaximumUnicodeStringLength Unicode characters not including the\r
  Null-terminator, then ASSERT().\r
\r
  @param  Destination Pointer to a Null-terminated Unicode string.\r
  @param  Source      Pointer to a Null-terminated Unicode string.\r
\r
  @return Destination\r
\r
**/\r
CHAR16 *\r
EFIAPI\r
StrCat (\r
  IN OUT  CHAR16                    *Destination,\r
  IN      CONST CHAR16              *Source\r
  )\r
{\r
  StrCpy (Destination + StrLen (Destination), Source);\r
\r
  //\r
  // Size of the resulting string should never be zero.\r
  // PcdMaximumUnicodeStringLength is tested inside StrLen().\r
  //\r
  ASSERT (StrSize (Destination) != 0);\r
  return Destination;\r
}\r
\r
/**\r
  Concatenates one Null-terminated Unicode string with a maximum length to the\r
  end of another Null-terminated Unicode string, and returns the concatenated\r
  Unicode string.\r
\r
  This function concatenates two Null-terminated Unicode strings. The contents\r
  of Null-terminated Unicode string Source are concatenated to the end of\r
  Null-terminated Unicode string Destination, and Destination is returned. At\r
  most, Length Unicode characters are concatenated from Source to the end of\r
  Destination, and Destination is always Null-terminated. If Length is 0, then\r
  Destination is returned unmodified. If Source and Destination overlap, then\r
  the results are undefined.\r
\r
  If Destination is NULL, then ASSERT().\r
  If Length > 0 and Destination is not aligned on a 16-bit boundary, then ASSERT().\r
  If Length > 0 and Source is NULL, then ASSERT().\r
  If Length > 0 and Source is not aligned on a 16-bit boundary, then ASSERT().\r
  If Source and Destination overlap, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and Destination contains more\r
  than PcdMaximumUnicodeStringLength Unicode characters not including the\r
  Null-terminator, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and Source contains more than\r
  PcdMaximumUnicodeStringLength Unicode characters not including the\r
  Null-terminator, then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and concatenating Destination\r
  and Source results in a Unicode string with more than\r
  PcdMaximumUnicodeStringLength Unicode characters not including the\r
  Null-terminator, then ASSERT().\r
\r
  @param  Destination Pointer to a Null-terminated Unicode string.\r
  @param  Source      Pointer to a Null-terminated Unicode string.\r
  @param  Length      Maximum number of Unicode characters to concatenate from\r
                      Source.\r
\r
  @return Destination\r
\r
**/\r
CHAR16 *\r
EFIAPI\r
StrnCat (\r
  IN OUT  CHAR16                    *Destination,\r
  IN      CONST CHAR16              *Source,\r
  IN      UINTN                     Length\r
  )\r
{\r
  StrnCpy (Destination + StrLen (Destination), Source, Length);\r
\r
  //\r
  // Size of the resulting string should never be zero.\r
  // PcdMaximumUnicodeStringLength is tested inside StrLen().\r
  //\r
  ASSERT (StrSize (Destination) != 0);\r
  return Destination;\r
}\r
\r
/**\r
  Returns the first occurance of a Null-terminated Unicode sub-string \r
  in a Null-terminated Unicode string.\r
\r
  This function scans the contents of the Null-terminated Unicode string \r
  specified by String and returns the first occurrence of SearchString.  \r
  If SearchString is not found in String, then NULL is returned.  If \r
  the length of SearchString is zero, then String is \r
  returned.\r
  \r
  If String is NULL, then ASSERT().\r
  If String is not aligned on a 16-bit boundary, then ASSERT().\r
  If SearchString is NULL, then ASSERT().\r
  If SearchString is not aligned on a 16-bit boundary, then ASSERT().\r
\r
  If PcdMaximumUnicodeStringLength is not zero, and SearchString \r
  or String contains more than PcdMaximumUnicodeStringLength Unicode \r
  characters not including the Null-terminator, then ASSERT().\r
\r
  @param  String                  Pointer to a Null-terminated Unicode string.\r
  @param  SearchString  Pointer to a Null-terminated Unicode string to search for.\r
\r
  @retval NULL            If the SearchString does not appear in String.\r
  @retval !NULL           If there is a match.\r
\r
**/\r
CHAR16 *\r
EFIAPI\r
StrStr (\r
  IN      CONST CHAR16                *String,\r
  IN      CONST CHAR16                *SearchString\r
  )\r
{\r
  CONST CHAR16 *FirstMatch;\r
  CONST CHAR16 *SearchStringTmp;\r
\r
  //\r
  // ASSERT both strings are less long than PcdMaximumUnicodeStringLength.\r
  // Length tests are performed inside StrLen().\r
  //\r
  ASSERT (StrSize (String) != 0);\r
  ASSERT (StrSize (SearchString) != 0);\r
\r
  while (*String != '\0') {\r
    SearchStringTmp = SearchString;\r
    FirstMatch = String;\r
    \r
    while ((*String == *SearchStringTmp) \r
            && (*SearchStringTmp != '\0') \r
            && (*String != '\0')) {\r
      String++;\r
      SearchStringTmp++;\r
    } \r
    \r
    if (*SearchStringTmp == '\0') {\r
      return (CHAR16 *) FirstMatch;\r
    }\r
\r
    if (SearchStringTmp == SearchString) {\r
      //\r
      // If no character from SearchString match,\r
      // move the pointer to the String under search\r
      // by one character.\r
      //\r
      String++;\r
    }\r
  }\r
\r
  return NULL;\r
}\r
\r
/**\r
  Check if a Unicode character is a decimal character.\r
\r
  This internal function checks if a Unicode character is a \r
  decimal character. The valid decimal character is from\r
  L'0' to L'9'.\r
\r
\r
  @param  Char  The character to check against.\r
\r
  @retval TRUE  If the Char is a decmial character.\r
  @retval FALSE Otherwise.\r
\r
**/\r
STATIC\r
BOOLEAN\r
InternalIsDecimalDigitCharacter (\r
  IN      CHAR16                    Char\r
  )\r
{\r
  return (BOOLEAN) (Char >= L'0' && Char <= L'9');\r
}\r
\r
/**\r
  Convert a Unicode character to upper case only if \r
  it maps to a valid small-case ASCII character.\r
\r
  This internal function only deal with Unicode character\r
  which maps to a valid small-case ASII character, i.e.\r
  L'a' to L'z'. For other Unicode character, the input character\r
  is returned directly.\r
\r
\r
  @param  Char  The character to convert.\r
\r
  @retval LowerCharacter   If the Char is with range L'a' to L'z'.\r
  @retval Unchanged        Otherwise.\r
\r
**/\r
STATIC\r
CHAR16\r
InternalCharToUpper (\r
  IN      CHAR16                    Char\r
  )\r
{\r
  if (Char >= L'a' && Char <= L'z') {\r
    return (CHAR16) (Char - (L'a' - L'A'));\r
  }\r
\r
  return Char;\r
}\r
\r
/**\r
  Convert a Unicode character to numerical value.\r
\r
  This internal function only deal with Unicode character\r
  which maps to a valid hexadecimal ASII character, i.e.\r
  L'0' to L'9', L'a' to L'f' or L'A' to L'F'. For other \r
  Unicode character, the value returned does not make sense.\r
\r
  @param  Char  The character to convert.\r
\r
  @retval UINTN   The numerical value converted.\r
\r
**/\r
STATIC\r
UINTN\r
InternalHexCharToUintn (\r
  IN      CHAR16                    Char\r
  )\r
{\r
  if (InternalIsDecimalDigitCharacter (Char)) {\r
    return Char - L'0';\r
  }\r
\r
  return (UINTN) (10 + InternalCharToUpper (Char) - L'A');\r
}\r
\r
/**\r
  Check if a Unicode character is a hexadecimal character.\r
\r
  This internal function checks if a Unicode character is a \r
  decimal character.  The valid hexadecimal character is \r
  L'0' to L'9', L'a' to L'f', or L'A' to L'F'.\r
\r
\r
  @param  Char  The character to check against.\r
\r
  @retval TRUE  If the Char is a hexadecmial character.\r
  @retval FALSE Otherwise.\r
\r
**/\r
STATIC\r
BOOLEAN\r
InternalIsHexaDecimalDigitCharacter (\r
  IN      CHAR16                    Char\r
  )\r
{\r
\r
  return (BOOLEAN) (InternalIsDecimalDigitCharacter (Char) ||\r
    (Char >= L'A' && Char <= L'F') ||\r
    (Char >= L'a' && Char <= L'f'));\r
}\r
\r
/**\r
  Convert a Null-terminated Unicode decimal string to a value of \r
  type UINTN.\r
\r
  This function returns a value of type UINTN by interpreting the contents \r
  of the Unicode string specified by String as a decimal number. The format \r
  of the input Unicode string String is:\r
  \r
                  [spaces] [decimal digits].\r
                  \r
  The valid decimal digit character is in the range [0-9]. The \r
  function will ignore the pad space, which includes spaces or \r
  tab characters, before [decimal digits]. The running zero in the \r
  beginning of [decimal digits] will be ignored. Then, the function \r
  stops at the first character that is a not a valid decimal character \r
  or a Null-terminator, whichever one comes first. \r
  \r
  If String is NULL, then ASSERT().\r
  If String is not aligned in a 16-bit boundary, then ASSERT().  \r
  If String has only pad spaces, then 0 is returned.\r
  If String has no pad spaces or valid decimal digits, \r
  then 0 is returned.\r
  If the number represented by String overflows according \r
  to the range defined by UINTN, then ASSERT().\r
  \r
  If PcdMaximumUnicodeStringLength is not zero, and String contains \r
  more than PcdMaximumUnicodeStringLength Unicode characters not including \r
  the Null-terminator, then ASSERT().\r
\r
  @param  String                Pointer to a Null-terminated Unicode string.\r
\r
  @retval UINTN           \r
\r
**/\r
UINTN\r
EFIAPI\r
StrDecimalToUintn (\r
  IN      CONST CHAR16                *String\r
  )\r
{\r
  UINTN     Result;\r
  \r
  //\r
  // ASSERT String is less long than PcdMaximumUnicodeStringLength.\r
  // Length tests are performed inside StrLen().\r
  //\r
  ASSERT (StrSize (String) != 0);\r
\r
  //\r
  // Ignore the pad spaces (space or tab)\r
  //\r
  while ((*String == L' ') || (*String == L'\t')) {\r
    String++;\r
  }\r
\r
  //\r
  // Ignore leading Zeros after the spaces\r
  //\r
  while (*String == L'0') {\r
    String++;\r
  }\r
\r
  Result = 0;\r
\r
  while (InternalIsDecimalDigitCharacter (*String)) {\r
    //\r
    // If the number represented by String overflows according \r
    // to the range defined by UINTN, then ASSERT().\r
    //\r
    ASSERT ((Result < QUIENT_MAX_UINTN_DIVIDED_BY_10) ||\r
      ((Result == QUIENT_MAX_UINTN_DIVIDED_BY_10) &&\r
      (*String - L'0') <= REMINDER_MAX_UINTN_DIVIDED_BY_10)\r
      );\r
\r
    Result = Result * 10 + (*String - L'0');\r
    String++;\r
  }\r
  \r
  return Result;\r
}\r
\r
\r
/**\r
  Convert a Null-terminated Unicode decimal string to a value of \r
  type UINT64.\r
\r
  This function returns a value of type UINT64 by interpreting the contents \r
  of the Unicode string specified by String as a decimal number. The format \r
  of the input Unicode string String is:\r
  \r
                  [spaces] [decimal digits].\r
                  \r
  The valid decimal digit character is in the range [0-9]. The \r
  function will ignore the pad space, which includes spaces or \r
  tab characters, before [decimal digits]. The running zero in the \r
  beginning of [decimal digits] will be ignored. Then, the function \r
  stops at the first character that is a not a valid decimal character \r
  or a Null-terminator, whichever one comes first. \r
  \r
  If String is NULL, then ASSERT().\r
  If String is not aligned in a 16-bit boundary, then ASSERT().  \r
  If String has only pad spaces, then 0 is returned.\r
  If String has no pad spaces or valid decimal digits, \r
  then 0 is returned.\r
  If the number represented by String overflows according \r
  to the range defined by UINT64, then ASSERT().\r
  \r
  If PcdMaximumUnicodeStringLength is not zero, and String contains \r
  more than PcdMaximumUnicodeStringLength Unicode characters not including \r
  the Null-terminator, then ASSERT().\r
\r
  @param  String                Pointer to a Null-terminated Unicode string.\r
\r
  @retval UINT64           \r
\r
**/\r
UINT64\r
EFIAPI\r
StrDecimalToUint64 (\r
  IN      CONST CHAR16                *String\r
  )\r
{\r
  UINT64     Result;\r
  \r
  //\r
  // ASSERT String is less long than PcdMaximumUnicodeStringLength.\r
  // Length tests are performed inside StrLen().\r
  //\r
  ASSERT (StrSize (String) != 0);\r
\r
  //\r
  // Ignore the pad spaces (space or tab)\r
  //\r
  while ((*String == L' ') || (*String == L'\t')) {\r
    String++;\r
  }\r
\r
  //\r
  // Ignore leading Zeros after the spaces\r
  //\r
  while (*String == L'0') {\r
    String++;\r
  }\r
\r
  Result = 0;\r
\r
  while (InternalIsDecimalDigitCharacter (*String)) {\r
    //\r
    // If the number represented by String overflows according \r
    // to the range defined by UINTN, then ASSERT().\r
    //\r
    ASSERT ((Result < QUIENT_MAX_UINT64_DIVIDED_BY_10) || \r
      ((Result == QUIENT_MAX_UINT64_DIVIDED_BY_10) && \r
      (*String - L'0') <= REMINDER_MAX_UINT64_DIVIDED_BY_10)\r
      );\r
\r
    Result = MultU64x32 (Result, 10) + (*String - L'0');\r
    String++;\r
  }\r
  \r
  return Result;\r
}\r
\r
/**\r
  Convert a Null-terminated Unicode hexadecimal string to a value of type UINTN.\r
\r
  This function returns a value of type UINTN by interpreting the contents \r
  of the Unicode string specified by String as a hexadecimal number. \r
  The format of the input Unicode string String is:\r
  \r
                  [spaces][zeros][x][hexadecimal digits]. \r
\r
  The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F]. \r
  The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. \r
  If "x" appears in the input string, it must be prefixed with at least one 0. \r
  The function will ignore the pad space, which includes spaces or tab characters, \r
  before [zeros], [x] or [hexadecimal digit]. The running zero before [x] or \r
  [hexadecimal digit] will be ignored. Then, the decoding starts after [x] or the \r
  first valid hexadecimal digit. Then, the function stops at the first character that is \r
  a not a valid hexadecimal character or NULL, whichever one comes first.\r
\r
  If String is NULL, then ASSERT().\r
  If String is not aligned in a 16-bit boundary, then ASSERT().\r
  If String has only pad spaces, then zero is returned.\r
  If String has no leading pad spaces, leading zeros or valid hexadecimal digits, \r
  then zero is returned.\r
  If the number represented by String overflows according to the range defined by \r
  UINTN, then ASSERT().\r
\r
  If PcdMaximumUnicodeStringLength is not zero, and String contains more than \r
  PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, \r
  then ASSERT().\r
\r
  @param  String                Pointer to a Null-terminated Unicode string.\r
\r
  @retval UINTN\r
\r
**/\r
UINTN\r
EFIAPI\r
StrHexToUintn (\r
  IN      CONST CHAR16                *String\r
  )\r
{\r
  UINTN     Result;\r
\r
  //\r
  // ASSERT String is less long than PcdMaximumUnicodeStringLength.\r
  // Length tests are performed inside StrLen().\r
  //\r
  ASSERT (StrSize (String) != 0);\r
  \r
  //\r
  // Ignore the pad spaces (space or tab) \r
  //\r
  while ((*String == L' ') || (*String == L'\t')) {\r
    String++;\r
  }\r
\r
  //\r
  // Ignore leading Zeros after the spaces\r
  //\r
  while (*String == L'0') {\r
    String++;\r
  }\r
\r
  if (InternalCharToUpper (*String) == L'X') {\r
    ASSERT (*(String - 1)  == L'0');\r
    if (*(String - 1)  != L'0') {\r
      return 0;\r
    }\r
    //\r
    // Skip the 'X'\r
    //\r
    String++;\r
  }\r
\r
  Result = 0;\r
  \r
  while (InternalIsHexaDecimalDigitCharacter (*String)) {\r
    //\r
    // If the Hex Number represented by String overflows according \r
    // to the range defined by UINTN, then ASSERT().\r
    //\r
    ASSERT ((Result < QUIENT_MAX_UINTN_DIVIDED_BY_16) ||\r
      ((Result == QUIENT_MAX_UINTN_DIVIDED_BY_16) && \r
      (InternalHexCharToUintn (*String) <= REMINDER_MAX_UINTN_DIVIDED_BY_16))\r
      );\r
\r
    Result = (Result << 4) + InternalHexCharToUintn (*String);\r
    String++;\r
  }\r
\r
  return Result;\r
}\r
\r
\r
/**\r
  Convert a Null-terminated Unicode hexadecimal string to a value of type UINT64.\r
\r
  This function returns a value of type UINT64 by interpreting the contents \r
  of the Unicode string specified by String as a hexadecimal number. \r
  The format of the input Unicode string String is \r
  \r
                  [spaces][zeros][x][hexadecimal digits]. \r
\r
  The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F]. \r
  The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. \r
  If "x" appears in the input string, it must be prefixed with at least one 0. \r
  The function will ignore the pad space, which includes spaces or tab characters, \r
  before [zeros], [x] or [hexadecimal digit]. The running zero before [x] or \r
  [hexadecimal digit] will be ignored. Then, the decoding starts after [x] or the \r
  first valid hexadecimal digit. Then, the function stops at the first character that is \r
  a not a valid hexadecimal character or NULL, whichever one comes first.\r
\r
  If String is NULL, then ASSERT().\r
  If String is not aligned in a 16-bit boundary, then ASSERT().\r
  If String has only pad spaces, then zero is returned.\r
  If String has no leading pad spaces, leading zeros or valid hexadecimal digits, \r
  then zero is returned.\r
  If the number represented by String overflows according to the range defined by \r
  UINT64, then ASSERT().\r
\r
  If PcdMaximumUnicodeStringLength is not zero, and String contains more than \r
  PcdMaximumUnicodeStringLength Unicode characters not including the Null-terminator, \r
  then ASSERT().\r
\r
  @param  String                Pointer to a Null-terminated Unicode string.\r
\r
  @retval UINT64\r
\r
**/\r
UINT64\r
EFIAPI\r
StrHexToUint64 (\r
  IN      CONST CHAR16                *String\r
  )\r
{\r
  UINT64    Result;\r
\r
  //\r
  // ASSERT String is less long than PcdMaximumUnicodeStringLength.\r
  // Length tests are performed inside StrLen().\r
  //\r
  ASSERT (StrSize (String) != 0);\r
  \r
  //\r
  // Ignore the pad spaces (space or tab) \r
  //\r
  while ((*String == L' ') || (*String == L'\t')) {\r
    String++;\r
  }\r
\r
  //\r
  // Ignore leading Zeros after the spaces\r
  //\r
  while (*String == L'0') {\r
    String++;\r
  }\r
\r
  if (InternalCharToUpper (*String) == L'X') {\r
    ASSERT (*(String - 1)  == L'0');\r
    if (*(String - 1)  != L'0') {\r
      return 0;\r
    }\r
    //\r
    // Skip the 'X'\r
    //\r
    String++;\r
  }\r
\r
  Result = 0;\r
  \r
  while (InternalIsHexaDecimalDigitCharacter (*String)) {\r
    //\r
    // If the Hex Number represented by String overflows according \r
    // to the range defined by UINTN, then ASSERT().\r
    //\r
    ASSERT ((Result < QUIENT_MAX_UINT64_DIVIDED_BY_16)|| \r
      ((Result == QUIENT_MAX_UINT64_DIVIDED_BY_16) && \r
      (InternalHexCharToUintn (*String) <= REMINDER_MAX_UINT64_DIVIDED_BY_16))\r
      );\r
\r
    Result = LShiftU64 (Result, 4);\r
    Result = Result + InternalHexCharToUintn (*String);\r
    String++;\r
  }\r
\r
  return Result;\r
}\r
\r
/**\r
  Check if a ASCII character is a decimal character.\r
\r
  This internal function checks if a Unicode character is a \r
  decimal character. The valid decimal character is from\r
  '0' to '9'.\r
\r
  @param  Char  The character to check against.\r
\r
  @retval TRUE  If the Char is a decmial character.\r
  @retval FALSE Otherwise.\r
\r
**/\r
STATIC\r
BOOLEAN\r
InternalAsciiIsDecimalDigitCharacter (\r
  IN      CHAR8                     Char\r
  )\r
{\r
  return (BOOLEAN) (Char >= '0' && Char <= '9');\r
}\r
\r
/**\r
  Check if a ASCII character is a hexadecimal character.\r
\r
  This internal function checks if a ASCII character is a \r
  decimal character.  The valid hexadecimal character is \r
  L'0' to L'9', L'a' to L'f', or L'A' to L'F'.\r
\r
\r
  @param  Char  The character to check against.\r
\r
  @retval TRUE  If the Char is a hexadecmial character.\r
  @retval FALSE Otherwise.\r
\r
**/\r
STATIC\r
BOOLEAN\r
InternalAsciiIsHexaDecimalDigitCharacter (\r
  IN      CHAR8                    Char\r
  )\r
{\r
\r
  return (BOOLEAN) (InternalAsciiIsDecimalDigitCharacter (Char) ||\r
    (Char >= 'A' && Char <= 'F') ||\r
    (Char >= 'a' && Char <= 'f'));\r
}\r
\r
/**\r
  Convert a Null-terminated Unicode string to a Null-terminated \r
  ASCII string and returns the ASCII string.\r
  \r
  This function converts the content of the Unicode string Source \r
  to the ASCII string Destination by copying the lower 8 bits of \r
  each Unicode character. It returns Destination. The function terminates \r
  the ASCII string Destination  by appending a Null-terminator character \r
  at the end. The caller is responsible to make sure Destination points \r
  to a buffer with size equal or greater than (StrLen (Source) + 1) in bytes.\r
\r
  If Destination is NULL, then ASSERT().\r
  If Source is NULL, then ASSERT().\r
  If Source is not aligned on a 16-bit boundary, then ASSERT().\r
  If Source and Destination overlap, then ASSERT().\r
\r
  If any Unicode characters in Source contain non-zero value in \r
  the upper 8 bits, then ASSERT().\r
  \r
  If PcdMaximumUnicodeStringLength is not zero, and Source contains \r
  more than PcdMaximumUnicodeStringLength Unicode characters not including \r
  the Null-terminator, then ASSERT().\r
  \r
  If PcdMaximumAsciiStringLength is not zero, and Source contains more \r
  than PcdMaximumAsciiStringLength Unicode characters not including the \r
  Null-terminator, then ASSERT().\r
\r
  @param  Source        Pointer to a Null-terminated Unicode string.\r
  @param  Destination   Pointer to a Null-terminated ASCII string.\r
\r
  @reture Destination\r
\r
**/\r
CHAR8 *\r
EFIAPI\r
UnicodeStrToAsciiStr (\r
  IN      CONST CHAR16                *Source,\r
  OUT     CHAR8                       *Destination\r
  )\r
{\r
  CHAR8                               *ReturnValue;\r
\r
  ASSERT (Destination != NULL);\r
\r
  //\r
  // ASSERT if Source is long than PcdMaximumUnicodeStringLength.\r
  // Length tests are performed inside StrLen().\r
  //\r
  ASSERT (StrSize (Source) != 0);\r
\r
  //\r
  // Source and Destination should not overlap\r
  //\r
  ASSERT ((UINTN) ((CHAR16 *) Destination -  Source) > StrLen (Source));\r
  ASSERT ((UINTN) ((CHAR8 *) Source - Destination) > StrLen (Source));\r
\r
\r
  ReturnValue = Destination;\r
  while (*Source != '\0') {\r
    //\r
    // If any Unicode characters in Source contain \r
    // non-zero value in the upper 8 bits, then ASSERT().\r
    //\r
    ASSERT (*Source < 0x100);\r
    *(Destination++) = (CHAR8) *(Source++);\r
  }\r
\r
  *Destination = '\0';\r
\r
  //\r
  // ASSERT Original Destination is less long than PcdMaximumAsciiStringLength.\r
  // Length tests are performed inside AsciiStrLen().\r
  //\r
  ASSERT (AsciiStrSize (ReturnValue) != 0);\r
\r
  return ReturnValue;\r
}\r
\r
\r
/**\r
  Copies one Null-terminated ASCII string to another Null-terminated ASCII\r
  string and returns the new ASCII string.\r
\r
  This function copies the contents of the ASCII string Source to the ASCII\r
  string Destination, and returns Destination. If Source and Destination\r
  overlap, then the results are undefined.\r
\r
  If Destination is NULL, then ASSERT().\r
  If Source is NULL, then ASSERT().\r
  If Source and Destination overlap, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero and Source contains more than\r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,\r
  then ASSERT().\r
\r
  @param  Destination Pointer to a Null-terminated ASCII string.\r
  @param  Source      Pointer to a Null-terminated ASCII string.\r
\r
  @return Destination\r
\r
**/\r
CHAR8 *\r
EFIAPI\r
AsciiStrCpy (\r
  OUT     CHAR8                     *Destination,\r
  IN      CONST CHAR8               *Source\r
  )\r
{\r
  CHAR8                             *ReturnValue;\r
\r
  //\r
  // Destination cannot be NULL\r
  //\r
  ASSERT (Destination != NULL);\r
\r
  //\r
  // Destination and source cannot overlap\r
  //\r
  ASSERT ((UINTN)(Destination - Source) > AsciiStrLen (Source));\r
  ASSERT ((UINTN)(Source - Destination) > AsciiStrLen (Source));\r
\r
  ReturnValue = Destination;\r
  while (*Source) {\r
    *(Destination++) = *(Source++);\r
  }\r
  *Destination = 0;\r
  return ReturnValue;\r
}\r
\r
/**\r
  Copies one Null-terminated ASCII string with a maximum length to another\r
  Null-terminated ASCII string with a maximum length and returns the new ASCII\r
  string.\r
\r
  This function copies the contents of the ASCII string Source to the ASCII\r
  string Destination, and returns Destination. At most, Length ASCII characters\r
  are copied from Source to Destination. If Length is 0, then Destination is\r
  returned unmodified. If Length is greater that the number of ASCII characters\r
  in Source, then Destination is padded with Null ASCII characters. If Source\r
  and Destination overlap, then the results are undefined.\r
\r
  If Destination is NULL, then ASSERT().\r
  If Source is NULL, then ASSERT().\r
  If Source and Destination overlap, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero, and Source contains more than\r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,\r
  then ASSERT().\r
\r
  @param  Destination Pointer to a Null-terminated ASCII string.\r
  @param  Source      Pointer to a Null-terminated ASCII string.\r
  @param  Length      Maximum number of ASCII characters to copy.\r
\r
  @return Destination\r
\r
**/\r
CHAR8 *\r
EFIAPI\r
AsciiStrnCpy (\r
  OUT     CHAR8                     *Destination,\r
  IN      CONST CHAR8               *Source,\r
  IN      UINTN                     Length\r
  )\r
{\r
  CHAR8                             *ReturnValue;\r
\r
  if (Length == 0) {\r
    return Destination;\r
  }\r
\r
  //\r
  // Destination cannot be NULL\r
  //\r
  ASSERT (Destination != NULL);\r
\r
  //\r
  // Destination and source cannot overlap\r
  //\r
  ASSERT ((UINTN)(Destination - Source) > AsciiStrLen (Source));\r
  ASSERT ((UINTN)(Source - Destination) >= Length);\r
\r
  ReturnValue = Destination;\r
\r
  while (*Source && Length > 0) {\r
    *(Destination++) = *(Source++);\r
    Length--;\r
  }\r
\r
  ZeroMem (Destination, Length * sizeof (*Destination));\r
  return ReturnValue;\r
}\r
\r
/**\r
  Returns the length of a Null-terminated ASCII string.\r
\r
  This function returns the number of ASCII characters in the Null-terminated\r
  ASCII string specified by String.\r
\r
  If String is NULL, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero and String contains more than\r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,\r
  then ASSERT().\r
\r
  @param  String  Pointer to a Null-terminated ASCII string.\r
\r
  @return The length of String.\r
\r
**/\r
UINTN\r
EFIAPI\r
AsciiStrLen (\r
  IN      CONST CHAR8               *String\r
  )\r
{\r
  UINTN                             Length;\r
\r
  ASSERT (String != NULL);\r
\r
  for (Length = 0; *String != '\0'; String++, Length++) {\r
    //\r
    // If PcdMaximumUnicodeStringLength is not zero,\r
    // length should not more than PcdMaximumUnicodeStringLength\r
    //\r
    if (PcdGet32 (PcdMaximumAsciiStringLength) != 0) {\r
      ASSERT (Length < PcdGet32 (PcdMaximumAsciiStringLength));\r
    }\r
  }\r
  return Length;\r
}\r
\r
/**\r
  Returns the size of a Null-terminated ASCII string in bytes, including the\r
  Null terminator.\r
\r
  This function returns the size, in bytes, of the Null-terminated ASCII string\r
  specified by String.\r
\r
  If String is NULL, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero and String contains more than\r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,\r
  then ASSERT().\r
\r
  @param  String  Pointer to a Null-terminated ASCII string.\r
\r
  @return The size of String.\r
\r
**/\r
UINTN\r
EFIAPI\r
AsciiStrSize (\r
  IN      CONST CHAR8               *String\r
  )\r
{\r
  return (AsciiStrLen (String) + 1) * sizeof (*String);\r
}\r
\r
/**\r
  Compares two Null-terminated ASCII strings, and returns the difference\r
  between the first mismatched ASCII characters.\r
\r
  This function compares the Null-terminated ASCII string FirstString to the\r
  Null-terminated ASCII string SecondString. If FirstString is identical to\r
  SecondString, then 0 is returned. Otherwise, the value returned is the first\r
  mismatched ASCII character in SecondString subtracted from the first\r
  mismatched ASCII character in FirstString.\r
\r
  If FirstString is NULL, then ASSERT().\r
  If SecondString is NULL, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero and FirstString contains more than\r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,\r
  then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero and SecondString contains more\r
  than PcdMaximumAsciiStringLength ASCII characters not including the\r
  Null-terminator, then ASSERT().\r
\r
  @param  FirstString   Pointer to a Null-terminated ASCII string.\r
  @param  SecondString  Pointer to a Null-terminated ASCII string.\r
\r
  @retval 0   FirstString is identical to SecondString.\r
  @retval !=0 FirstString is not identical to SecondString.\r
\r
**/\r
INTN\r
EFIAPI\r
AsciiStrCmp (\r
  IN      CONST CHAR8               *FirstString,\r
  IN      CONST CHAR8               *SecondString\r
  )\r
{\r
  //\r
  // ASSERT both strings are less long than PcdMaximumAsciiStringLength\r
  //\r
  ASSERT (AsciiStrSize (FirstString));\r
  ASSERT (AsciiStrSize (SecondString));\r
\r
  while ((*FirstString != '\0') && (*FirstString == *SecondString)) {\r
    FirstString++;\r
    SecondString++;\r
  }\r
\r
  return *FirstString - *SecondString;\r
}\r
\r
/**\r
  Converts a lowercase Ascii character to upper one\r
\r
  If Chr is lowercase Ascii character, then converts it to upper one.\r
\r
  If Value >= 0xA0, then ASSERT().\r
  If (Value & 0x0F) >= 0x0A, then ASSERT().\r
\r
  @param  chr   one Ascii character\r
\r
  @return The uppercase value of Ascii character \r
\r
**/\r
STATIC\r
CHAR8\r
AsciiToUpper (\r
  IN      CHAR8                     Chr\r
  )\r
{\r
  return (UINT8) ((Chr >= 'a' && Chr <= 'z') ? Chr - ('a' - 'A') : Chr);\r
}\r
\r
/**\r
  Convert a ASCII character to numerical value.\r
\r
  This internal function only deal with Unicode character\r
  which maps to a valid hexadecimal ASII character, i.e.\r
  '0' to '9', 'a' to 'f' or 'A' to 'F'. For other \r
  ASCII character, the value returned does not make sense.\r
\r
  @param  Char  The character to convert.\r
\r
  @retval UINTN   The numerical value converted.\r
\r
**/\r
STATIC\r
UINTN\r
InternalAsciiHexCharToUintn (\r
  IN      CHAR8                    Char\r
  )\r
{\r
  if (InternalIsDecimalDigitCharacter (Char)) {\r
    return Char - '0';\r
  }\r
\r
  return (UINTN) (10 + AsciiToUpper (Char) - 'A');\r
}\r
\r
\r
/**\r
  Performs a case insensitive comparison of two Null-terminated ASCII strings,\r
  and returns the difference between the first mismatched ASCII characters.\r
\r
  This function performs a case insensitive comparison of the Null-terminated\r
  ASCII string FirstString to the Null-terminated ASCII string SecondString. If\r
  FirstString is identical to SecondString, then 0 is returned. Otherwise, the\r
  value returned is the first mismatched lower case ASCII character in\r
  SecondString subtracted from the first mismatched lower case ASCII character\r
  in FirstString.\r
\r
  If FirstString is NULL, then ASSERT().\r
  If SecondString is NULL, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero and FirstString contains more than\r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,\r
  then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero and SecondString contains more\r
  than PcdMaximumAsciiStringLength ASCII characters not including the\r
  Null-terminator, then ASSERT().\r
\r
  @param  FirstString   Pointer to a Null-terminated ASCII string.\r
  @param  SecondString  Pointer to a Null-terminated ASCII string.\r
\r
  @retval 0   FirstString is identical to SecondString using case insensitive\r
              comparisons.\r
  @retval !=0 FirstString is not identical to SecondString using case\r
              insensitive comparisons.\r
\r
**/\r
INTN\r
EFIAPI\r
AsciiStriCmp (\r
  IN      CONST CHAR8               *FirstString,\r
  IN      CONST CHAR8               *SecondString\r
  )\r
{\r
  CHAR8  UpperFirstString;\r
  CHAR8  UpperSecondString;\r
\r
  //\r
  // ASSERT both strings are less long than PcdMaximumAsciiStringLength\r
  //\r
  ASSERT (AsciiStrSize (FirstString));\r
  ASSERT (AsciiStrSize (SecondString));\r
\r
  UpperFirstString  = AsciiToUpper (*FirstString);\r
  UpperSecondString = AsciiToUpper (*SecondString);\r
  while ((*FirstString != '\0') && (UpperFirstString == UpperSecondString)) {\r
    FirstString++;\r
    SecondString++;\r
    UpperFirstString  = AsciiToUpper (*FirstString);\r
    UpperSecondString = AsciiToUpper (*SecondString);\r
  }\r
\r
  return UpperFirstString - UpperSecondString;\r
}\r
\r
/**\r
  Compares two Null-terminated ASCII strings with maximum lengths, and returns\r
  the difference between the first mismatched ASCII characters.\r
\r
  This function compares the Null-terminated ASCII string FirstString to the\r
  Null-terminated ASCII  string SecondString. At most, Length ASCII characters\r
  will be compared. If Length is 0, then 0 is returned. If FirstString is\r
  identical to SecondString, then 0 is returned. Otherwise, the value returned\r
  is the first mismatched ASCII character in SecondString subtracted from the\r
  first mismatched ASCII character in FirstString.\r
\r
  If FirstString is NULL, then ASSERT().\r
  If SecondString is NULL, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero and FirstString contains more than\r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,\r
  then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero and SecondString contains more than\r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,\r
  then ASSERT().\r
\r
  @param  FirstString   Pointer to a Null-terminated ASCII string.\r
  @param  SecondString  Pointer to a Null-terminated ASCII string.\r
\r
  @retval 0   FirstString is identical to SecondString.\r
  @retval !=0 FirstString is not identical to SecondString.\r
\r
**/\r
INTN\r
EFIAPI\r
AsciiStrnCmp (\r
  IN      CONST CHAR8               *FirstString,\r
  IN      CONST CHAR8               *SecondString,\r
  IN      UINTN                     Length\r
  )\r
{\r
  if (Length == 0) {\r
    return 0;\r
  }\r
\r
  //\r
  // ASSERT both strings are less long than PcdMaximumAsciiStringLength\r
  //\r
  ASSERT (AsciiStrSize (FirstString));\r
  ASSERT (AsciiStrSize (SecondString));\r
\r
  while ((*FirstString != '\0') &&\r
         (*FirstString == *SecondString) &&\r
         (Length > 1)) {\r
    FirstString++;\r
    SecondString++;\r
    Length--;\r
  }\r
  return *FirstString - *SecondString;\r
}\r
\r
/**\r
  Concatenates one Null-terminated ASCII string to another Null-terminated\r
  ASCII string, and returns the concatenated ASCII string.\r
\r
  This function concatenates two Null-terminated ASCII strings. The contents of\r
  Null-terminated ASCII string Source are concatenated to the end of Null-\r
  terminated ASCII string Destination. The Null-terminated concatenated ASCII\r
  String is returned.\r
\r
  If Destination is NULL, then ASSERT().\r
  If Source is NULL, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero and Destination contains more than\r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,\r
  then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero and Source contains more than\r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,\r
  then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero and concatenating Destination and\r
  Source results in a ASCII string with more than PcdMaximumAsciiStringLength\r
  ASCII characters, then ASSERT().\r
\r
  @param  Destination Pointer to a Null-terminated ASCII string.\r
  @param  Source      Pointer to a Null-terminated ASCII string.\r
\r
  @return Destination\r
\r
**/\r
CHAR8 *\r
EFIAPI\r
AsciiStrCat (\r
  IN OUT CHAR8    *Destination,\r
  IN CONST CHAR8  *Source\r
  )\r
{\r
  AsciiStrCpy (Destination + AsciiStrLen (Destination), Source);\r
\r
  //\r
  // Size of the resulting string should never be zero.\r
  // PcdMaximumUnicodeStringLength is tested inside StrLen().\r
  //\r
  ASSERT (AsciiStrSize (Destination) != 0);\r
  return Destination;\r
}\r
\r
/**\r
  Concatenates one Null-terminated ASCII string with a maximum length to the\r
  end of another Null-terminated ASCII string, and returns the concatenated\r
  ASCII string.\r
\r
  This function concatenates two Null-terminated ASCII strings. The contents\r
  of Null-terminated ASCII string Source are concatenated to the end of Null-\r
  terminated ASCII string Destination, and Destination is returned. At most,\r
  Length ASCII characters are concatenated from Source to the end of\r
  Destination, and Destination is always Null-terminated. If Length is 0, then\r
  Destination is returned unmodified. If Source and Destination overlap, then\r
  the results are undefined.\r
\r
  If Destination is NULL, then ASSERT().\r
  If Source is NULL, then ASSERT().\r
  If Source and Destination overlap, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero, and Destination contains more than\r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,\r
  then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero, and Source contains more than\r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,\r
  then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero, and concatenating Destination and\r
  Source results in a ASCII string with more than PcdMaximumAsciiStringLength\r
  ASCII characters not including the Null-terminator, then ASSERT().\r
\r
  @param  Destination Pointer to a Null-terminated ASCII string.\r
  @param  Source      Pointer to a Null-terminated ASCII string.\r
  @param  Length      Maximum number of ASCII characters to concatenate from\r
                      Source.\r
\r
  @return Destination\r
\r
**/\r
CHAR8 *\r
EFIAPI\r
AsciiStrnCat (\r
  IN OUT  CHAR8                     *Destination,\r
  IN      CONST CHAR8               *Source,\r
  IN      UINTN                     Length\r
  )\r
{\r
  AsciiStrnCpy (Destination + AsciiStrLen (Destination), Source, Length);\r
\r
  //\r
  // Size of the resulting string should never be zero.\r
  // PcdMaximumUnicodeStringLength is tested inside StrLen().\r
  //\r
  ASSERT (AsciiStrSize (Destination) != 0);\r
  return Destination;\r
}\r
\r
/**\r
  Returns the first occurance of a Null-terminated ASCII sub-string \r
  in a Null-terminated ASCII string.\r
\r
  This function scans the contents of the ASCII string specified by String \r
  and returns the first occurrence of SearchString. If SearchString is not \r
  found in String, then NULL is returned. If the length of SearchString is zero, \r
  then String is returned.\r
  \r
  If String is NULL, then ASSERT().\r
  If SearchString is NULL, then ASSERT().\r
\r
  If PcdMaximumAsciiStringLength is not zero, and SearchString or \r
  String contains more than PcdMaximumAsciiStringLength Unicode characters \r
  not including the Null-terminator, then ASSERT().\r
\r
  @param  String          Pointer to a Null-terminated ASCII string.\r
  @param  SearchString    Pointer to a Null-terminated ASCII string to search for.\r
\r
  @retval NULL            If the SearchString does not appear in String.\r
  @retval !NULL           If there is a match.\r
\r
**/\r
CHAR8 *\r
EFIAPI\r
AsciiStrStr (\r
  IN      CONST CHAR8             *String,\r
  IN      CONST CHAR8             *SearchString\r
  )\r
{\r
  CONST CHAR8 *FirstMatch;\r
  CONST CHAR8 *SearchStringTmp;\r
\r
  //\r
  // ASSERT both strings are less long than PcdMaximumAsciiStringLength\r
  //\r
  ASSERT (AsciiStrSize (String) != 0);\r
  ASSERT (AsciiStrSize (SearchString) != 0);\r
\r
  while (*String != '\0') {\r
    SearchStringTmp = SearchString;\r
    FirstMatch = String;\r
    \r
    while ((*String == *SearchStringTmp) \r
            && (*SearchStringTmp != '\0') \r
            && (*String != '\0')) {\r
      String++;\r
      SearchStringTmp++;\r
    } \r
    \r
    if (*SearchStringTmp == '\0') {\r
      return (CHAR8 *) FirstMatch;\r
    }\r
\r
    if (SearchStringTmp == SearchString) {\r
      //\r
      // If no character from SearchString match,\r
      // move the pointer to the String under search\r
      // by one character.\r
      //\r
      String++;\r
    }\r
\r
  }\r
\r
  return NULL;\r
}\r
\r
/**\r
  Convert a Null-terminated ASCII decimal string to a value of type \r
  UINTN.\r
\r
  This function returns a value of type UINTN by interpreting the contents \r
  of the ASCII string String as a decimal number. The format of the input \r
  ASCII string String is:\r
  \r
                    [spaces] [decimal digits].\r
  \r
  The valid decimal digit character is in the range [0-9]. The function will \r
  ignore the pad space, which includes spaces or tab characters, before the digits. \r
  The running zero in the beginning of [decimal digits] will be ignored. Then, the \r
  function stops at the first character that is a not a valid decimal character or \r
  Null-terminator, whichever on comes first.\r
  \r
  If String has only pad spaces, then 0 is returned.\r
  If String has no pad spaces or valid decimal digits, then 0 is returned.\r
  If the number represented by String overflows according to the range defined by \r
  UINTN, then ASSERT().\r
  If String is NULL, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero, and String contains more than \r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, \r
  then ASSERT().\r
\r
  @param  String                Pointer to a Null-terminated ASCII string.\r
\r
  @retval UINTN           \r
\r
**/\r
UINTN\r
EFIAPI\r
AsciiStrDecimalToUintn (\r
  IN      CONST CHAR8               *String\r
  )\r
{\r
  UINTN     Result;\r
  \r
  //\r
  // ASSERT Strings is less long than PcdMaximumAsciiStringLength\r
  //\r
  ASSERT (AsciiStrSize (String) != 0);\r
\r
  //\r
  // Ignore the pad spaces (space or tab)\r
  //\r
  while ((*String == ' ') || (*String == '\t')) {\r
    String++;\r
  }\r
\r
  //\r
  // Ignore leading Zeros after the spaces\r
  //\r
  while (*String == '0') {\r
    String++;\r
  }\r
\r
  Result = 0;\r
\r
  while (InternalAsciiIsDecimalDigitCharacter (*String)) {\r
    //\r
    // If the number represented by String overflows according \r
    // to the range defined by UINTN, then ASSERT().\r
    //\r
    ASSERT ((Result < QUIENT_MAX_UINTN_DIVIDED_BY_10) ||\r
      ((Result == QUIENT_MAX_UINTN_DIVIDED_BY_10) && \r
      (*String - '0') <= REMINDER_MAX_UINTN_DIVIDED_BY_10)\r
      );\r
\r
    Result = Result * 10 + (*String - '0');\r
    String++;\r
  }\r
  \r
  return Result;\r
}\r
\r
\r
/**\r
  Convert a Null-terminated ASCII decimal string to a value of type \r
  UINT64.\r
\r
  This function returns a value of type UINT64 by interpreting the contents \r
  of the ASCII string String as a decimal number. The format of the input \r
  ASCII string String is:\r
  \r
                    [spaces] [decimal digits].\r
  \r
  The valid decimal digit character is in the range [0-9]. The function will \r
  ignore the pad space, which includes spaces or tab characters, before the digits. \r
  The running zero in the beginning of [decimal digits] will be ignored. Then, the \r
  function stops at the first character that is a not a valid decimal character or \r
  Null-terminator, whichever on comes first.\r
  \r
  If String has only pad spaces, then 0 is returned.\r
  If String has no pad spaces or valid decimal digits, then 0 is returned.\r
  If the number represented by String overflows according to the range defined by \r
  UINT64, then ASSERT().\r
  If String is NULL, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero, and String contains more than \r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, \r
  then ASSERT().\r
\r
  @param  String                Pointer to a Null-terminated ASCII string.\r
\r
  @retval UINT64           \r
\r
**/\r
UINT64\r
EFIAPI\r
AsciiStrDecimalToUint64 (\r
  IN      CONST CHAR8             *String\r
  )\r
{\r
  UINT64     Result;\r
  \r
  //\r
  // ASSERT Strings is less long than PcdMaximumAsciiStringLength\r
  //\r
  ASSERT (AsciiStrSize (String) != 0);\r
\r
  //\r
  // Ignore the pad spaces (space or tab)\r
  //\r
  while ((*String == ' ') || (*String == '\t')) {\r
    String++;\r
  }\r
\r
  //\r
  // Ignore leading Zeros after the spaces\r
  //\r
  while (*String == '0') {\r
    String++;\r
  }\r
\r
  Result = 0;\r
\r
  while (InternalAsciiIsDecimalDigitCharacter (*String)) {\r
    //\r
    // If the number represented by String overflows according \r
    // to the range defined by UINTN, then ASSERT().\r
    //\r
    ASSERT ((Result < QUIENT_MAX_UINT64_DIVIDED_BY_10) || \r
      ((Result == QUIENT_MAX_UINT64_DIVIDED_BY_10) && \r
      (*String - '0') <= REMINDER_MAX_UINT64_DIVIDED_BY_10)\r
      );\r
\r
    Result = MultU64x32 (Result, 10) + (*String - '0');\r
    String++;\r
  }\r
  \r
  return Result;\r
}\r
\r
/**\r
  Convert a Null-terminated ASCII hexadecimal string to a value of type UINTN.\r
\r
  This function returns a value of type UINTN by interpreting the contents of \r
  the ASCII string String as a hexadecimal number. The format of the input ASCII \r
  string String is:\r
  \r
                  [spaces][zeros][x][hexadecimal digits].\r
                  \r
  The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F]. \r
  The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. If "x" \r
  appears in the input string, it must be prefixed with at least one 0. The function \r
  will ignore the pad space, which includes spaces or tab characters, before [zeros], \r
  [x] or [hexadecimal digits]. The running zero before [x] or [hexadecimal digits] \r
  will be ignored. Then, the decoding starts after [x] or the first valid hexadecimal \r
  digit. Then, the function stops at the first character that is a not a valid \r
  hexadecimal character or Null-terminator, whichever on comes first.\r
  \r
  If String has only pad spaces, then 0 is returned.\r
  If String has no leading pad spaces, leading zeros or valid hexadecimal digits, then\r
  0 is returned.\r
\r
  If the number represented by String overflows according to the range defined by UINTN, \r
  then ASSERT().\r
  If String is NULL, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero, \r
  and String contains more than PcdMaximumAsciiStringLength ASCII characters not including \r
  the Null-terminator, then ASSERT().\r
\r
  @param  String                Pointer to a Null-terminated ASCII string.\r
\r
  @retval UINTN\r
\r
**/\r
UINTN\r
EFIAPI\r
AsciiStrHexToUintn (\r
  IN      CONST CHAR8             *String\r
  )\r
{\r
  UINTN     Result;\r
\r
  //\r
  // ASSERT Strings is less long than PcdMaximumAsciiStringLength\r
  //\r
  ASSERT (AsciiStrSize (String) != 0);\r
  \r
  //\r
  // Ignore the pad spaces (space or tab) \r
  //\r
  while ((*String == ' ') || (*String == '\t')) {\r
    String++;\r
  }\r
\r
  //\r
  // Ignore leading Zeros after the spaces\r
  //\r
  while (*String == '0') {\r
    String++;\r
  }\r
\r
  if (AsciiToUpper (*String) == 'X') {\r
    ASSERT (*(String - 1)  == '0');\r
    if (*(String - 1)  != '0') {\r
      return 0;\r
    }\r
    //\r
    // Skip the 'X'\r
    //\r
    String++;\r
  }\r
\r
  Result = 0;\r
  \r
  while (InternalAsciiIsHexaDecimalDigitCharacter (*String)) {\r
    //\r
    // If the Hex Number represented by String overflows according \r
    // to the range defined by UINTN, then ASSERT().\r
    //\r
     ASSERT ((Result < QUIENT_MAX_UINTN_DIVIDED_BY_16) ||\r
       ((Result == QUIENT_MAX_UINTN_DIVIDED_BY_16) && \r
       (InternalAsciiHexCharToUintn (*String) <= REMINDER_MAX_UINTN_DIVIDED_BY_16))\r
       );\r
\r
    Result = (Result << 4) + InternalAsciiHexCharToUintn (*String);\r
    String++;\r
  }\r
\r
  return Result;\r
}\r
\r
\r
/**\r
  Convert a Null-terminated ASCII hexadecimal string to a value of type UINT64.\r
\r
  This function returns a value of type UINT64 by interpreting the contents of \r
  the ASCII string String as a hexadecimal number. The format of the input ASCII \r
  string String is:\r
  \r
                  [spaces][zeros][x][hexadecimal digits].\r
                  \r
  The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F]. \r
  The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. If "x" \r
  appears in the input string, it must be prefixed with at least one 0. The function \r
  will ignore the pad space, which includes spaces or tab characters, before [zeros], \r
  [x] or [hexadecimal digits]. The running zero before [x] or [hexadecimal digits] \r
  will be ignored. Then, the decoding starts after [x] or the first valid hexadecimal \r
  digit. Then, the function stops at the first character that is a not a valid \r
  hexadecimal character or Null-terminator, whichever on comes first.\r
  \r
  If String has only pad spaces, then 0 is returned.\r
  If String has no leading pad spaces, leading zeros or valid hexadecimal digits, then\r
  0 is returned.\r
\r
  If the number represented by String overflows according to the range defined by UINT64, \r
  then ASSERT().\r
  If String is NULL, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero, \r
  and String contains more than PcdMaximumAsciiStringLength ASCII characters not including \r
  the Null-terminator, then ASSERT().\r
\r
  @param  String                Pointer to a Null-terminated ASCII string.\r
\r
  @retval UINT64\r
\r
**/\r
UINT64\r
EFIAPI\r
AsciiStrHexToUint64 (\r
  IN      CONST CHAR8             *String\r
  )\r
{\r
  UINT64    Result;\r
\r
  //\r
  // ASSERT Strings is less long than PcdMaximumAsciiStringLength\r
  //\r
  ASSERT (AsciiStrSize (String) != 0);\r
  \r
  //\r
  // Ignore the pad spaces (space or tab) and leading Zeros\r
  //\r
  //\r
  // Ignore the pad spaces (space or tab) \r
  //\r
  while ((*String == ' ') || (*String == '\t')) {\r
    String++;\r
  }\r
\r
  //\r
  // Ignore leading Zeros after the spaces\r
  //\r
  while (*String == '0') {\r
    String++;\r
  }\r
\r
  if (AsciiToUpper (*String) == 'X') {\r
    ASSERT (*(String - 1)  == '0');\r
    if (*(String - 1)  != '0') {\r
      return 0;\r
    }\r
    //\r
    // Skip the 'X'\r
    //\r
    String++;\r
  }\r
\r
  Result = 0;\r
  \r
  while (InternalAsciiIsHexaDecimalDigitCharacter (*String)) {\r
    //\r
    // If the Hex Number represented by String overflows according \r
    // to the range defined by UINTN, then ASSERT().\r
    //\r
    ASSERT ((Result < QUIENT_MAX_UINT64_DIVIDED_BY_16) ||\r
      ((Result == QUIENT_MAX_UINT64_DIVIDED_BY_16) && \r
      (InternalAsciiHexCharToUintn (*String) <= REMINDER_MAX_UINT64_DIVIDED_BY_16))\r
      );\r
\r
    Result = LShiftU64 (Result, 4);\r
    Result = Result + InternalAsciiHexCharToUintn (*String);\r
    String++;\r
  }\r
\r
  return Result;\r
}\r
\r
\r
/**\r
  Convert one Null-terminated ASCII string to a Null-terminated \r
  Unicode string and returns the Unicode string.\r
\r
  This function converts the contents of the ASCII string Source to the Unicode \r
  string Destination, and returns Destination.  The function terminates the \r
  Unicode string Destination by appending a Null-terminator character at the end. \r
  The caller is responsible to make sure Destination points to a buffer with size \r
  equal or greater than ((AsciiStrLen (Source) + 1) * sizeof (CHAR16)) in bytes.\r
  \r
  If Destination is NULL, then ASSERT().\r
  If Destination is not aligned on a 16-bit boundary, then ASSERT().\r
  If Source is NULL, then ASSERT().\r
  If Source and Destination overlap, then ASSERT().\r
  If PcdMaximumAsciiStringLength is not zero, and Source contains more than \r
  PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator, \r
  then ASSERT().\r
  If PcdMaximumUnicodeStringLength is not zero, and Source contains more than \r
  PcdMaximumUnicodeStringLength ASCII characters not including the \r
  Null-terminator, then ASSERT().\r
\r
  @param  Source        Pointer to a Null-terminated ASCII string.\r
  @param  Destination   Pointer to a Null-terminated Unicode string.\r
\r
  @reture Destination\r
\r
**/\r
CHAR16 *\r
EFIAPI\r
AsciiStrToUnicodeStr (\r
  IN      CONST CHAR8               *Source,\r
  OUT     CHAR16                    *Destination\r
  )\r
{\r
  CHAR16                            *ReturnValue;\r
\r
  ASSERT (Destination != NULL);\r
\r
  //\r
  // ASSERT Source is less long than PcdMaximumAsciiStringLength\r
  //\r
  ASSERT (AsciiStrSize (Source) != 0);\r
\r
  //\r
  // Source and Destination should not overlap\r
  //\r
  ASSERT ((UINTN) ((CHAR8 *) Destination - Source) > AsciiStrLen (Source));\r
  ASSERT ((UINTN) (Source - (CHAR8 *) Destination) > (AsciiStrLen (Source) * sizeof (CHAR16)));\r
\r
 \r
  ReturnValue = Destination;\r
  while (*Source != '\0') {\r
    *(Destination++) = (CHAR16) *(Source++);\r
  }\r
  //\r
  // End the Destination with a NULL.\r
  //\r
  *Destination = '\0';\r
\r
  //\r
  // ASSERT Original Destination is less long than PcdMaximumUnicodeStringLength\r
  //\r
  ASSERT (StrSize (ReturnValue) != 0);\r
\r
  return ReturnValue;\r
}\r
\r
/**\r
  Converts an 8-bit value to an 8-bit BCD value.\r
\r
  Converts the 8-bit value specified by Value to BCD. The BCD value is\r
  returned.\r
\r
  If Value >= 100, then ASSERT().\r
\r
  @param  Value The 8-bit value to convert to BCD. Range 0..99.\r
\r
  @return The BCD value\r
\r
**/\r
UINT8\r
EFIAPI\r
DecimalToBcd8 (\r
  IN      UINT8                     Value\r
  )\r
{\r
  ASSERT (Value < 100);\r
  return (UINT8) (((Value / 10) << 4) | (Value % 10));\r
}\r
\r
/**\r
  Converts an 8-bit BCD value to an 8-bit value.\r
\r
  Converts the 8-bit BCD value specified by Value to an 8-bit value. The 8-bit\r
  value is returned.\r
\r
  If Value >= 0xA0, then ASSERT().\r
  If (Value & 0x0F) >= 0x0A, then ASSERT().\r
\r
  @param  Value The 8-bit BCD value to convert to an 8-bit value.\r
\r
  @return The 8-bit value is returned.\r
\r
**/\r
UINT8\r
EFIAPI\r
BcdToDecimal8 (\r
  IN      UINT8                     Value\r
  )\r
{\r
  ASSERT (Value < 0xa0);\r
  ASSERT ((Value & 0xf) < 0xa);\r
  return (UINT8) ((Value >> 4) * 10 + (Value & 0xf));\r
}\r
\r
\r