--- /dev/null
+/**@file
+ Copyright (c) 2007, Intel Corporation
+
+ All rights reserved. This program and the accompanying materials
+ are licensed and made available under the terms and conditions of the BSD License
+ which accompanies this distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+
+**/
+
+#include "Setup.h"
+
+CHAR16
+NibbleToHexChar (
+ IN UINT8 Nibble
+ )
+/*++
+
+ Routine Description:
+ Converts the low nibble of a byte to hex unicode character.
+
+ Arguments:
+ Nibble - lower nibble of a byte.
+
+ Returns:
+ Hex unicode character.
+
+--*/
+{
+ Nibble &= 0x0F;
+ if (Nibble <= 0x9) {
+ return (CHAR16)(Nibble + L'0');
+ }
+
+ return (CHAR16)(Nibble - 0xA + L'A');
+}
+
+
+
+/**
+ Converts binary buffer to Unicode string.
+ At a minimum, any blob of data could be represented as a hex string.
+
+ @param Str Pointer to the string.
+ @param HexStringBufferLength Length in bytes of buffer to hold the hex string.
+ Includes tailing '\0' character. If routine return
+ with EFI_SUCCESS, containing length of hex string
+ buffer. If routine return with
+ EFI_BUFFER_TOO_SMALL, containg length of hex
+ string buffer desired.
+ @param Buf Buffer to be converted from.
+ @param Len Length in bytes of the buffer to be converted.
+
+ @retval EFI_SUCCESS Routine success.
+ @retval EFI_BUFFER_TOO_SMALL The hex string buffer is too small.
+
+**/
+EFI_STATUS
+R8_BufToHexString (
+ IN OUT CHAR16 *Str,
+ IN OUT UINTN *HexStringBufferLength,
+ IN UINT8 *Buf,
+ IN UINTN Len
+ )
+{
+ //
+ // Porting Guide:
+ // This library interface is simply obsolete.
+ // Include the source code to user code.
+ //
+ UINTN Idx;
+ UINT8 Byte;
+ UINTN StrLen;
+
+ //
+ // Make sure string is either passed or allocate enough.
+ // It takes 2 Unicode characters (4 bytes) to represent 1 byte of the binary buffer.
+ // Plus the Unicode termination character.
+ //
+ StrLen = Len * 2;
+ if (StrLen > ((*HexStringBufferLength) - 1)) {
+ *HexStringBufferLength = StrLen + 1;
+ return EFI_BUFFER_TOO_SMALL;
+ }
+
+ *HexStringBufferLength = StrLen + 1;
+ //
+ // Ends the string.
+ //
+ Str[StrLen] = L'\0';
+
+ for (Idx = 0; Idx < Len; Idx++) {
+
+ Byte = Buf[Idx];
+ Str[StrLen - 1 - Idx * 2] = NibbleToHexChar (Byte);
+ Str[StrLen - 2 - Idx * 2] = NibbleToHexChar ((UINT8)(Byte >> 4));
+ }
+
+ return EFI_SUCCESS;
+}
+
+
+
+
+/**
+ Converts Unicode string to binary buffer.
+ The conversion may be partial.
+ The first character in the string that is not hex digit stops the conversion.
+ At a minimum, any blob of data could be represented as a hex string.
+
+ @param Buf Pointer to buffer that receives the data.
+ @param Len Length in bytes of the buffer to hold converted
+ data. If routine return with EFI_SUCCESS,
+ containing length of converted data. If routine
+ return with EFI_BUFFER_TOO_SMALL, containg length
+ of buffer desired.
+ @param Str String to be converted from.
+ @param ConvertedStrLen Length of the Hex String consumed.
+
+ @retval EFI_SUCCESS Routine Success.
+ @retval EFI_BUFFER_TOO_SMALL The buffer is too small to hold converted data.
+
+**/
+EFI_STATUS
+R8_HexStringToBuf (
+ IN OUT UINT8 *Buf,
+ IN OUT UINTN *Len,
+ IN CHAR16 *Str,
+ OUT UINTN *ConvertedStrLen OPTIONAL
+ )
+{
+ //
+ // Porting Guide:
+ // This library interface is simply obsolete.
+ // Include the source code to user code.
+ //
+
+ UINTN HexCnt;
+ UINTN Idx;
+ UINTN BufferLength;
+ UINT8 Digit;
+ UINT8 Byte;
+
+ //
+ // Find out how many hex characters the string has.
+ //
+ for (Idx = 0, HexCnt = 0; R8_IsHexDigit (&Digit, Str[Idx]); Idx++, HexCnt++);
+
+ if (HexCnt == 0) {
+ *Len = 0;
+ return EFI_SUCCESS;
+ }
+ //
+ // Two Unicode characters make up 1 buffer byte. Round up.
+ //
+ BufferLength = (HexCnt + 1) / 2;
+
+ //
+ // Test if buffer is passed enough.
+ //
+ if (BufferLength > (*Len)) {
+ *Len = BufferLength;
+ return EFI_BUFFER_TOO_SMALL;
+ }
+
+ *Len = BufferLength;
+
+ for (Idx = 0; Idx < HexCnt; Idx++) {
+
+ R8_IsHexDigit (&Digit, Str[HexCnt - 1 - Idx]);
+
+ //
+ // For odd charaters, write the lower nibble for each buffer byte,
+ // and for even characters, the upper nibble.
+ //
+ if ((Idx & 1) == 0) {
+ Byte = Digit;
+ } else {
+ Byte = Buf[Idx / 2];
+ Byte &= 0x0F;
+ Byte = (UINT8) (Byte | Digit << 4);
+ }
+
+ Buf[Idx / 2] = Byte;
+ }
+
+ if (ConvertedStrLen != NULL) {
+ *ConvertedStrLen = HexCnt;
+ }
+
+ return EFI_SUCCESS;
+}
+
+
+
+
+/**
+ Determines if a Unicode character is a hexadecimal digit.
+ The test is case insensitive.
+
+ @param Digit Pointer to byte that receives the value of the hex
+ character.
+ @param Char Unicode character to test.
+
+ @retval TRUE If the character is a hexadecimal digit.
+ @retval FALSE Otherwise.
+
+**/
+BOOLEAN
+R8_IsHexDigit (
+ OUT UINT8 *Digit,
+ IN CHAR16 Char
+ )
+{
+ //
+ // Porting Guide:
+ // This library interface is simply obsolete.
+ // Include the source code to user code.
+ //
+
+ if ((Char >= L'0') && (Char <= L'9')) {
+ *Digit = (UINT8) (Char - L'0');
+ return TRUE;
+ }
+
+ if ((Char >= L'A') && (Char <= L'F')) {
+ *Digit = (UINT8) (Char - L'A' + 0x0A);
+ return TRUE;
+ }
+
+ if ((Char >= L'a') && (Char <= L'f')) {
+ *Digit = (UINT8) (Char - L'a' + 0x0A);
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+
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