/** @file
  Unicode Collation protocol that follows the UEFI 2.0 specification.
  This protocol is used to allow code running in the boot services environment
  to perform lexical comparison functions on Unicode strings for given languages.

Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef __UNICODE_COLLATION_H__
#define __UNICODE_COLLATION_H__

#define EFI_UNICODE_COLLATION_PROTOCOL2_GUID \
  { \
    0xa4c751fc, 0x23ae, 0x4c3e, {0x92, 0xe9, 0x49, 0x64, 0xcf, 0x63, 0xf3, 0x49 } \
  }

typedef struct _EFI_UNICODE_COLLATION_PROTOCOL EFI_UNICODE_COLLATION_PROTOCOL;

///
/// Protocol data structures and defines
///
#define EFI_UNICODE_BYTE_ORDER_MARK  (CHAR16) (0xfeff)

//
// Protocol member functions
//

/**
  Performs a case-insensitive comparison of two Null-terminated strings.

  @param  This A pointer to the EFI_UNICODE_COLLATION_PROTOCOL instance.
  @param  Str1 A pointer to a Null-terminated string.
  @param  Str2 A pointer to a Null-terminated string.

  @retval 0   Str1 is equivalent to Str2.
  @retval >0  Str1 is lexically greater than Str2.
  @retval <0  Str1 is lexically less than Str2.

**/
typedef
INTN
(EFIAPI *EFI_UNICODE_COLLATION_STRICOLL)(
  IN EFI_UNICODE_COLLATION_PROTOCOL         *This,
  IN CHAR16                                 *Str1,
  IN CHAR16                                 *Str2
  );

/**
  Performs a case-insensitive comparison of a Null-terminated
  pattern string and a Null-terminated string.

  @param  This    A pointer to the EFI_UNICODE_COLLATION_PROTOCOL instance.
  @param  String  A pointer to a Null-terminated string.
  @param  Pattern A pointer to a Null-terminated pattern string.

  @retval TRUE    Pattern was found in String.
  @retval FALSE   Pattern was not found in String.

**/
typedef
BOOLEAN
(EFIAPI *EFI_UNICODE_COLLATION_METAIMATCH)(
  IN EFI_UNICODE_COLLATION_PROTOCOL         *This,
  IN CHAR16                                 *String,
  IN CHAR16                                 *Pattern
  );

/**
  Converts all the characters in a Null-terminated string to
  lower case characters.

  @param  This   A pointer to the EFI_UNICODE_COLLATION_PROTOCOL instance.
  @param  String A pointer to a Null-terminated string.

**/
typedef
VOID
(EFIAPI *EFI_UNICODE_COLLATION_STRLWR)(
  IN EFI_UNICODE_COLLATION_PROTOCOL         *This,
  IN OUT CHAR16                             *Str
  );

/**
  Converts all the characters in a Null-terminated string to upper
  case characters.

  @param  This   A pointer to the EFI_UNICODE_COLLATION_PROTOCOL instance.
  @param  String A pointer to a Null-terminated string.

**/
typedef
VOID
(EFIAPI *EFI_UNICODE_COLLATION_STRUPR)(
  IN EFI_UNICODE_COLLATION_PROTOCOL         *This,
  IN OUT CHAR16                             *Str
  );

/**
  Converts an 8.3 FAT file name in an OEM character set to a Null-terminated
  string.

  @param  This    A pointer to the EFI_UNICODE_COLLATION_PROTOCOL instance.
  @param  FatSize The size of the string Fat in bytes.
  @param  Fat     A pointer to a Null-terminated string that contains an 8.3 file
                  name using an 8-bit OEM character set.
  @param  String  A pointer to a Null-terminated string. The string must
                  be allocated in advance to hold FatSize characters.

**/
typedef
VOID
(EFIAPI *EFI_UNICODE_COLLATION_FATTOSTR)(
  IN EFI_UNICODE_COLLATION_PROTOCOL         *This,
  IN UINTN                                  FatSize,
  IN CHAR8                                  *Fat,
  OUT CHAR16                                *String
  );

/**
  Converts a Null-terminated string to legal characters in a FAT
  filename using an OEM character set.

  @param  This    A pointer to the EFI_UNICODE_COLLATION_PROTOCOL instance.
  @param  String  A pointer to a Null-terminated string.
  @param  FatSize The size of the string Fat in bytes.
  @param  Fat     A pointer to a string that contains the converted version of
                  String using legal FAT characters from an OEM character set.

  @retval TRUE    One or more conversions failed and were substituted with '_'
  @retval FALSE   None of the conversions failed.

**/
typedef
BOOLEAN
(EFIAPI *EFI_UNICODE_COLLATION_STRTOFAT)(
  IN EFI_UNICODE_COLLATION_PROTOCOL         *This,
  IN CHAR16                                 *String,
  IN UINTN                                  FatSize,
  OUT CHAR8                                 *Fat
  );

///
/// The EFI_UNICODE_COLLATION_PROTOCOL is used to perform case-insensitive
/// comparisons of strings.
///
struct _EFI_UNICODE_COLLATION_PROTOCOL {
  EFI_UNICODE_COLLATION_STRICOLL      StriColl;
  EFI_UNICODE_COLLATION_METAIMATCH    MetaiMatch;
  EFI_UNICODE_COLLATION_STRLWR        StrLwr;
  EFI_UNICODE_COLLATION_STRUPR        StrUpr;

  //
  // for supporting fat volumes
  //
  EFI_UNICODE_COLLATION_FATTOSTR      FatToStr;
  EFI_UNICODE_COLLATION_STRTOFAT      StrToFat;

  ///
  /// A Null-terminated ASCII string array that contains one or more language codes.
  /// When this field is used for UnicodeCollation2, it is specified in RFC 4646 format.
  /// When it is used for UnicodeCollation, it is specified in ISO 639-2 format.
  ///
  CHAR8                               *SupportedLanguages;
};

extern EFI_GUID  gEfiUnicodeCollation2ProtocolGuid;

#endif