This library provides UCS2 to UFT8 or vise versa functions to
manipulate UCS2/UTF8 strings. This library is currently used
by edk2 port of open source jansson library.

Signed-off-by: Abner Chang <abner.chang@hpe.com>

Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Nickle Wang <nickle.wang@hpe.com>
Cc: Peter O'Hanley <peter.ohanley@hpe.com>
Reviewed-by: Nickle Wang <nickle.wang@hpe.com>
Acked-by: Leif Lindholm <leif@nuviainc.com>
---
 RedfishPkg/RedfishPkg.dec                     |   4 +
 RedfishPkg/RedfishLibs.dsc.inc                |   1 +
 RedfishPkg/RedfishPkg.dsc                     |   1 +
 .../BaseUcs2Utf8Lib/BaseUcs2Utf8Lib.inf       |  31 ++
 RedfishPkg/Include/Library/BaseUcs2Utf8Lib.h  |  61 +++
 .../Library/BaseUcs2Utf8Lib/BaseUcs2Utf8Lib.c | 421 ++++++++++++++++++
 6 files changed, 519 insertions(+)
 create mode 100644 RedfishPkg/Library/BaseUcs2Utf8Lib/BaseUcs2Utf8Lib.inf
 create mode 100644 RedfishPkg/Include/Library/BaseUcs2Utf8Lib.h
 create mode 100644 RedfishPkg/Library/BaseUcs2Utf8Lib/BaseUcs2Utf8Lib.c

diff --git a/RedfishPkg/RedfishPkg.dec b/RedfishPkg/RedfishPkg.dec
index 89a2a6de1e..4cae8c3a4a 100644
--- a/RedfishPkg/RedfishPkg.dec
+++ b/RedfishPkg/RedfishPkg.dec
@@ -20,6 +20,10 @@
   ##  @libraryclass Platform Redfish Host Interface Library
   #   Platform implementation-specific Redfish Host Interface.
   RedfishPlatformHostInterfaceLib|Include/Library/RedfishHostInterfaceLib.h
+  ##  @libraryclass  This library provides UCS2 to UTF8 manipulation
+  #   functions.
+  #
+  Ucs2Utf8Lib|Include/Library/BaseUcs2Utf8Lib.h
 
   ##  @libraryclass Platform Redfish Credential Library
   #   Platform implementation-specific Redfish Credential Interface.
diff --git a/RedfishPkg/RedfishLibs.dsc.inc b/RedfishPkg/RedfishLibs.dsc.inc
index df21664f4e..271d838db6 100644
--- a/RedfishPkg/RedfishLibs.dsc.inc
+++ b/RedfishPkg/RedfishLibs.dsc.inc
@@ -12,5 +12,6 @@
 ##
 !if $(REDFISH_ENABLE) == TRUE
   RestExLib|RedfishPkg/Library/DxeRestExLib/DxeRestExLib.inf
+  Ucs2Utf8Lib|RedfishPkg/Library/BaseUcs2Utf8Lib/BaseUcs2Utf8Lib.inf
 !endif
 
diff --git a/RedfishPkg/RedfishPkg.dsc b/RedfishPkg/RedfishPkg.dsc
index 5d9476bc79..15355493e2 100644
--- a/RedfishPkg/RedfishPkg.dsc
+++ b/RedfishPkg/RedfishPkg.dsc
@@ -50,5 +50,6 @@
   RedfishPkg/Library/PlatformHostInterfaceLibNull/PlatformHostInterfaceLibNull.inf
   RedfishPkg/Library/PlatformCredentialLibNull/PlatformCredentialLibNull.inf
   RedfishPkg/Library/DxeRestExLib/DxeRestExLib.inf
+  RedfishPkg/Library/BaseUcs2Utf8Lib/BaseUcs2Utf8Lib.inf
 
   !include RedfishPkg/Redfish.dsc.inc
diff --git a/RedfishPkg/Library/BaseUcs2Utf8Lib/BaseUcs2Utf8Lib.inf b/RedfishPkg/Library/BaseUcs2Utf8Lib/BaseUcs2Utf8Lib.inf
new file mode 100644
index 0000000000..beb7e77892
--- /dev/null
+++ b/RedfishPkg/Library/BaseUcs2Utf8Lib/BaseUcs2Utf8Lib.inf
@@ -0,0 +1,31 @@
+## @file
+# UCS2 to UTF8 manipulation library.
+#
+# Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+# (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
+#
+#    SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x0001001b
+  BASE_NAME                      = BaseUcs2Utf8Lib
+  FILE_GUID                      = 536646C3-46D0-4B12-ABC4-CDE1A33B5256
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = Ucs2Utf8Lib
+
+#
+#  VALID_ARCHITECTURES           = IA32 X64 ARM AARCH64 RISCV64
+#
+
+[Sources]
+  BaseUcs2Utf8Lib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  RedfishPkg/RedfishPkg.dec
+
+
diff --git a/RedfishPkg/Include/Library/BaseUcs2Utf8Lib.h b/RedfishPkg/Include/Library/BaseUcs2Utf8Lib.h
new file mode 100644
index 0000000000..c6989617df
--- /dev/null
+++ b/RedfishPkg/Include/Library/BaseUcs2Utf8Lib.h
@@ -0,0 +1,61 @@
+/** @file
+  UCS2 to UTF8 manipulation library header file.
+
+  Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+  (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
+
+    SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef BASE_UCS2UTF8_LIB_H_
+#define BASE_UCS2UTF8_LIB_H_
+
+///
+///  L"\u0000"
+///
+#define UNICODE_FORMAT_LEN         6
+#define UNICODE_FORMAT_CHAR_LEN    2
+#define UNICODE_FORMAT_CHAR_SIZE   3
+
+#define UTF8_BUFFER_FOR_UCS2_MAX_SIZE   3
+
+/**
+  Convert a UCS2 string to a UTF8 encoded string.
+
+  @param[in]    Ucs2Str                The provided UCS2 string.
+  @param[out]   Utf8StrAddr            The converted UTF8 string address. Caller
+                                       is responsible for Free this string.
+
+  @retval       EFI_INVALID_PARAMETER  One or more parameters are invalid.
+  @retval       EFI_OUT_OF_RESOURCES   System runs out of resources.
+  @retval       EFI_SUCCESS            The UTF8 encoded string has been converted.
+
+**/
+EFI_STATUS
+UCS2StrToUTF8 (
+  IN  CHAR16     *Ucs2Str,
+  OUT CHAR8      **Utf8StrAddr
+  );
+
+/**
+  Convert a UTF8 encoded string to a UCS2 string.
+
+  @param[in]    Utf8Str                The provided UTF8 encoded string.
+  @param[out]   Ucs2StrAddr            The converted UCS2 string address. Caller
+                                       is responsible for Free this string.
+
+  @retval       EFI_INVALID_PARAMETER  The UTF8 encoded string is not valid to
+                                       convert to UCS2 string.
+                                       One or more parameters are invalid.
+  @retval       EFI_OUT_OF_RESOURCES   System runs out of resources.
+  @retval       EFI_SUCCESS            The UCS2 string has been converted.
+
+**/
+EFI_STATUS
+UTF8StrToUCS2 (
+  IN  CHAR8      *Utf8Str,
+  OUT CHAR16     **Ucs2StrAddr
+  );
+
+#endif
diff --git a/RedfishPkg/Library/BaseUcs2Utf8Lib/BaseUcs2Utf8Lib.c b/RedfishPkg/Library/BaseUcs2Utf8Lib/BaseUcs2Utf8Lib.c
new file mode 100644
index 0000000000..891423734b
--- /dev/null
+++ b/RedfishPkg/Library/BaseUcs2Utf8Lib/BaseUcs2Utf8Lib.c
@@ -0,0 +1,421 @@
+/** @file
+  UCS2 to UTF8 manipulation library.
+
+  Copyright (c) 2018 - 2019, Intel Corporation. All rights reserved.<BR>
+  (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
+
+    SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+#include <Uefi.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/BaseUcs2Utf8Lib.h>
+#include <Library/DebugLib.h>
+#include <Library/MemoryAllocationLib.h>
+
+/**
+  Since each UCS2 character can be represented by 1-3 UTF8 encoded characters,
+  this function is used to retrieve the UTF8 encoding size for a UCS2 character.
+
+  @param[in]   Utf8Buffer       The buffer for UTF8 encoded data.
+
+  @retval      Return the size of UTF8 encoding string or 0 if it is not for
+               UCS2 format.
+
+**/
+UINT8
+GetUTF8SizeForUCS2 (
+  IN    CHAR8      *Utf8Buffer
+  )
+{
+  CHAR8    TempChar;
+  UINT8    Utf8Size;
+
+  ASSERT (Utf8Buffer != NULL);
+
+  TempChar = *Utf8Buffer;
+  if ((TempChar & 0xF0) == 0xF0) {
+
+    //
+    // This format is not for UCS2.
+    //
+    return 0;
+  }
+
+  Utf8Size = 1;
+  if ((TempChar & 0x80) == 0x80) {
+    if ((TempChar & 0xC0) == 0xC0) {
+
+      Utf8Size ++;
+      if ((TempChar & 0xE0) == 0xE0) {
+
+        Utf8Size ++;
+      }
+    }
+  }
+
+  return Utf8Size;
+}
+
+/**
+  Since each UCS2 character can be represented by the format: \uXXXX, this function
+  is used to retrieve the UCS2 character from a Unicode format.
+  Call MUST make sure there are at least 6 Bytes in the input UTF8 buffer.
+
+  @param[in]    Utf8Buffer             The buffer for UTF8 encoded data.
+  @param[out]   Ucs2Char               The converted UCS2 character.
+
+  @retval       EFI_INVALID_PARAMETER  Non-Ascii characters found in the hexadecimal
+                                       digits string, and can't be converted to a UCS2
+                                       character.
+  @retval       EFI_SUCCESS            The UCS2 character has been retrieved.
+
+**/
+EFI_STATUS
+GetUCS2CharByFormat (
+  IN    CHAR8      *Utf8Buffer,
+  OUT   CHAR16     *Ucs2Char
+  )
+{
+  UINT8     Num1;
+  UINT8     Num2;
+  UINT8     Index;
+  CHAR8     Ucs2CharFormat[UNICODE_FORMAT_CHAR_SIZE];  /// two Hexadecimal digits Ascii string, like "3F"
+
+  for (Index = 0; Index < 4; Index ++) {
+    if ((*(Utf8Buffer + 2 + Index) & 0x80) != 0x00) {
+      return EFI_INVALID_PARAMETER;
+    }
+  }
+
+  ZeroMem (Ucs2CharFormat, UNICODE_FORMAT_CHAR_SIZE);
+
+  //
+  // Get the First Number, Offset is 2
+  //
+  CopyMem (Ucs2CharFormat, Utf8Buffer + 2, UNICODE_FORMAT_CHAR_LEN);
+  Num1 = (UINT8) AsciiStrHexToUintn (Ucs2CharFormat);
+
+  //
+  // Get the Second Number, Offset is 4
+  //
+  CopyMem (Ucs2CharFormat, Utf8Buffer + 4, UNICODE_FORMAT_CHAR_LEN);
+  Num2 = (UINT8) AsciiStrHexToUintn (Ucs2CharFormat);
+
+  //
+  // Ucs2Char is Little-Endian
+  //
+  *((CHAR8 *) Ucs2Char)        = Num2;
+  *(((CHAR8 *) Ucs2Char) + 1) = Num1;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Convert a UCS2 character to UTF8 encoding string.
+
+  @param[in]    Ucs2Char               The provided UCS2 character.
+  @param[out]   Utf8Buffer             The converted UTF8 encoded data.
+
+  @retval      Return the size of UTF8 encoding data for this UCS2 character.
+
+**/
+UINT8
+UCS2CharToUTF8 (
+  IN  CHAR16     Ucs2Char,
+  OUT CHAR8      *Utf8Buffer
+  )
+{
+  UINT16    Ucs2Number;
+
+  ASSERT (Utf8Buffer != NULL);
+
+  Ucs2Number = (UINT16) Ucs2Char;
+  if (Ucs2Number <= 0x007F) {
+
+    //
+    // UTF8 format: 0xxxxxxx
+    //
+    *Utf8Buffer = Ucs2Char & 0x7F;
+    return 1;
+
+  } else if (Ucs2Number >= 0x0080 && Ucs2Number <= 0x07FF) {
+
+    //
+    // UTF8 format: 110xxxxx 10xxxxxx
+    //
+    *(Utf8Buffer + 1) = (Ucs2Char & 0x3F) | 0x80;
+    *Utf8Buffer       = ((Ucs2Char >> 6) & 0x1F) | 0xC0;
+    return 2;
+
+  } else {  /// Ucs2Number >= 0x0800 && Ucs2Number <= 0xFFFF
+
+    //
+    // UTF8 format: 1110xxxx 10xxxxxx 10xxxxxx
+    //
+    *(Utf8Buffer + 2) = (Ucs2Char & 0x3F) | 0x80;
+    *(Utf8Buffer + 1) = ((Ucs2Char >> 6) & 0x3F) | 0x80;
+    *Utf8Buffer       = ((Ucs2Char >> 12) & 0x0F) | 0xE0;
+    return 3;
+  }
+}
+
+/**
+  Convert a UTF8 encoded data to a UCS2 character.
+
+  @param[in]    Utf8Buffer             The provided UTF8 encoded data.
+  @param[out]   Ucs2Char               The converted UCS2 character.
+
+  @retval       EFI_INVALID_PARAMETER  The UTF8 encoded string is not valid or
+                                       not for UCS2 character.
+  @retval       EFI_SUCCESS            The converted UCS2 character.
+
+**/
+EFI_STATUS
+UTF8ToUCS2Char (
+  IN   CHAR8      *Utf8Buffer,
+  OUT  CHAR16     *Ucs2Char
+  )
+{
+  UINT8    Utf8Size;
+  CHAR8    *Ucs2Buffer;
+  CHAR8    TempChar1;
+  CHAR8    TempChar2;
+  CHAR8    TempChar3;
+
+  ASSERT (Utf8Buffer != NULL && Ucs2Char != NULL);
+  ZeroMem (Ucs2Char, sizeof (CHAR16));
+  Ucs2Buffer = (CHAR8 *) Ucs2Char;
+
+  Utf8Size = GetUTF8SizeForUCS2 (Utf8Buffer);
+  switch (Utf8Size) {
+
+    case 1:
+
+      //
+      // UTF8 format: 0xxxxxxx
+      //
+      TempChar1 = *Utf8Buffer;
+      if ((TempChar1 & 0x80) != 0x00) {
+        return EFI_INVALID_PARAMETER;
+      }
+
+      *Ucs2Buffer       = TempChar1;
+      *(Ucs2Buffer + 1) = 0;
+      break;
+
+    case 2:
+
+      //
+      // UTF8 format: 110xxxxx 10xxxxxx
+      //
+      TempChar1 = *Utf8Buffer;
+      if ((TempChar1 & 0xE0) != 0xC0) {
+        return EFI_INVALID_PARAMETER;
+      }
+
+      TempChar2 = *(Utf8Buffer + 1);
+      if ((TempChar2 & 0xC0) != 0x80) {
+        return EFI_INVALID_PARAMETER;
+      }
+
+      *Ucs2Buffer       = (TempChar1 << 6) + (TempChar2 & 0x3F);
+      *(Ucs2Buffer + 1) = (TempChar1 >> 2) & 0x07;
+      break;
+
+    case 3:
+
+      //
+      // UTF8 format: 1110xxxx 10xxxxxx 10xxxxxx
+      //
+      TempChar1 = *Utf8Buffer;
+      if ((TempChar1 & 0xF0) != 0xE0) {
+        return EFI_INVALID_PARAMETER;
+      }
+
+      TempChar2 = *(Utf8Buffer + 1);
+      if ((TempChar2 & 0xC0) != 0x80) {
+        return EFI_INVALID_PARAMETER;
+      }
+
+      TempChar3 = *(Utf8Buffer + 2);
+      if ((TempChar3 & 0xC0) != 0x80) {
+        return EFI_INVALID_PARAMETER;
+      }
+
+      *Ucs2Buffer       = (TempChar2 << 6) + (TempChar3 & 0x3F);
+      *(Ucs2Buffer + 1) = (TempChar1 << 4) + ((TempChar2 >> 2) & 0x0F);
+
+      break;
+
+    default:
+
+      return EFI_INVALID_PARAMETER;
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Convert a UCS2 string to a UTF8 encoded string.
+
+  @param[in]    Ucs2Str                The provided UCS2 string.
+  @param[out]   Utf8StrAddr            The converted UTF8 string address. Caller
+                                       is responsible for Free this string.
+
+  @retval       EFI_INVALID_PARAMETER  One or more parameters are invalid.
+  @retval       EFI_OUT_OF_RESOURCES   System runs out of resources.
+  @retval       EFI_SUCCESS            The UTF8 encoded string has been converted.
+
+**/
+EFI_STATUS
+UCS2StrToUTF8 (
+  IN  CHAR16     *Ucs2Str,
+  OUT CHAR8      **Utf8StrAddr
+  )
+{
+  UINTN    Ucs2StrIndex;
+  UINTN    Ucs2StrLength;
+  CHAR8    *Utf8Str;
+  UINTN    Utf8StrLength;
+  UINTN    Utf8StrIndex;
+  CHAR8    Utf8Buffer[UTF8_BUFFER_FOR_UCS2_MAX_SIZE];
+  UINT8    Utf8BufferSize;
+
+  if (Ucs2Str == NULL || Utf8StrAddr == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Ucs2StrLength = StrLen (Ucs2Str);
+  Utf8StrLength = 0;
+
+  for (Ucs2StrIndex = 0; Ucs2StrIndex < Ucs2StrLength; Ucs2StrIndex ++) {
+
+    ZeroMem (Utf8Buffer, sizeof (Utf8Buffer));
+    Utf8BufferSize = UCS2CharToUTF8 (Ucs2Str[Ucs2StrIndex], Utf8Buffer);
+    Utf8StrLength += Utf8BufferSize;
+  }
+
+  Utf8Str = AllocateZeroPool (Utf8StrLength + 1);
+  if (Utf8Str == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  Utf8StrIndex = 0;
+  for (Ucs2StrIndex = 0; Ucs2StrIndex < Ucs2StrLength; Ucs2StrIndex ++) {
+
+    ZeroMem (Utf8Buffer, sizeof (Utf8Buffer));
+    Utf8BufferSize = UCS2CharToUTF8 (Ucs2Str[Ucs2StrIndex], Utf8Buffer);
+
+    CopyMem (Utf8Str + Utf8StrIndex, Utf8Buffer, Utf8BufferSize);
+    Utf8StrIndex += Utf8BufferSize;
+  }
+
+  Utf8Str[Utf8StrIndex] = '\0';
+  *Utf8StrAddr = Utf8Str;
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Convert a UTF8 encoded string to a UCS2 string.
+
+  @param[in]    Utf8Str                The provided UTF8 encoded string.
+  @param[out]   Ucs2StrAddr            The converted UCS2 string address. Caller
+                                       is responsible for Free this string.
+
+  @retval       EFI_INVALID_PARAMETER  The UTF8 encoded string is not valid to
+                                       convert to UCS2 string.
+                                       One or more parameters are invalid.
+  @retval       EFI_OUT_OF_RESOURCES   System runs out of resources.
+  @retval       EFI_SUCCESS            The UCS2 string has been converted.
+
+**/
+EFI_STATUS
+UTF8StrToUCS2 (
+  IN  CHAR8      *Utf8Str,
+  OUT CHAR16     **Ucs2StrAddr
+  )
+{
+  EFI_STATUS    Status;
+  UINTN         Utf8StrIndex;
+  UINTN         Utf8StrLength;
+  UINTN         Ucs2StrIndex;
+  UINT8         Utf8BufferSize;
+  CHAR16        *Ucs2StrTemp;
+
+  if (Utf8Str == NULL || Ucs2StrAddr == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // It is not an Ascii string, calculate string length.
+  //
+  Utf8StrLength = 0;
+  while (*(Utf8Str + Utf8StrLength) != '\0') {
+    Utf8StrLength ++;
+  }
+
+  //
+  // UCS2 string shall not be longer than the UTF8 string.
+  //
+  Ucs2StrTemp = AllocateZeroPool ((Utf8StrLength + 1) * sizeof (CHAR16));
+  if (Ucs2StrTemp == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  Utf8StrIndex = 0;
+  Ucs2StrIndex = 0;
+  while (Utf8Str[Utf8StrIndex] != '\0') {
+
+    if (CompareMem (Utf8Str + Utf8StrIndex, "\\u", 2) == 0 &&
+      Utf8StrLength - Utf8StrIndex >= UNICODE_FORMAT_LEN) {
+
+      Status = GetUCS2CharByFormat (Utf8Str + Utf8StrIndex, Ucs2StrTemp + Ucs2StrIndex);
+      if (!EFI_ERROR (Status)) {
+
+        Utf8StrIndex += UNICODE_FORMAT_LEN;
+        Ucs2StrIndex ++;
+      } else {
+
+        StrCpyS (Ucs2StrTemp + Ucs2StrIndex, 3, L"\\u");
+
+        Ucs2StrIndex += 2;
+        Utf8StrIndex += 2;
+      }
+    } else {
+
+      Utf8BufferSize = GetUTF8SizeForUCS2 (Utf8Str + Utf8StrIndex);
+      if (Utf8BufferSize == 0 || Utf8StrLength - Utf8StrIndex < Utf8BufferSize) {
+
+        FreePool (Ucs2StrTemp);
+        return EFI_INVALID_PARAMETER;
+      }
+
+      Status = UTF8ToUCS2Char (Utf8Str + Utf8StrIndex, Ucs2StrTemp + Ucs2StrIndex);
+      if (EFI_ERROR (Status)) {
+
+        FreePool (Ucs2StrTemp);
+        return EFI_INVALID_PARAMETER;
+      }
+
+      Ucs2StrIndex ++;
+      Utf8StrIndex += Utf8BufferSize;
+    }
+  }
+
+  *Ucs2StrAddr = AllocateZeroPool ((Ucs2StrIndex + 1) * sizeof (CHAR16));
+  if (*Ucs2StrAddr == NULL) {
+
+    FreePool (Ucs2StrTemp);
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  StrCpyS (*Ucs2StrAddr, Ucs2StrIndex + 1, Ucs2StrTemp);
+  *(*Ucs2StrAddr + Ucs2StrIndex) = L'\0';
+  FreePool (Ucs2StrTemp);
+
+  return EFI_SUCCESS;
+}
+
-- 
2.17.1



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