-\r
-\r
-/**\r
- Convert a nibble in the low 4 bits of a byte to a Unicode hexadecimal character.\r
-\r
- This function converts a nibble in the low 4 bits of a byte to a Unicode hexadecimal \r
- character For example, the nibble 0x01 and 0x0A will converted to L'1' and L'A' \r
- respectively.\r
-\r
- The upper nibble in the input byte will be masked off.\r
-\r
- @param Nibble The nibble which is in the low 4 bits of the input byte.\r
-\r
- @return The Unicode hexadecimal character.\r
- \r
-**/\r
-CHAR16\r
-NibbleToHexChar (\r
- IN UINT8 Nibble\r
- )\r
-{\r
- Nibble &= 0x0F;\r
- if (Nibble <= 0x9) {\r
- return (CHAR16)(Nibble + L'0');\r
- }\r
-\r
- return (CHAR16)(Nibble - 0xA + L'A');\r
-}\r
-\r
-/** \r
- Convert binary buffer to a Unicode String in a specified sequence. \r
-\r
- This function converts bytes in the memory block pointed by Buffer to a Unicode String Str. \r
- Each byte will be represented by two Unicode characters. For example, byte 0xA1 will \r
- be converted into two Unicode character L'A' and L'1'. In the output String, the Unicode Character \r
- for the Most Significant Nibble will be put before the Unicode Character for the Least Significant\r
- Nibble. The output string for the buffer containing a single byte 0xA1 will be L"A1". \r
- For a buffer with multiple bytes, the Unicode character produced by the first byte will be put into the \r
- the last character in the output string. The one next to first byte will be put into the\r
- character before the last character. This rules applies to the rest of the bytes. The Unicode\r
- character by the last byte will be put into the first character in the output string. For example,\r
- the input buffer for a 64-bits unsigned integrer 0x12345678abcdef1234 will be converted to\r
- a Unicode string equal to L"12345678abcdef1234".\r
-\r
- @param String Pointer to the buffer allocated for the convertion.\r
- @param StringLen On input: Pointer to length in bytes of buffer to hold the Unicode string.\r
- On output:If return EFI_SUCCESS, pointer to length of Unicode string converted.\r
- If return EFI_BUFFER_TOO_SMALL, pointer to length of string buffer desired.\r
- @param Buffer The pointer to a input buffer.\r
- @param BufferSizeInBytes Lenth in bytes of the input buffer.\r
- \r
- @retval EFI_SUCCESS The convertion is successfull. All bytes in Buffer has been convert to the corresponding\r
- Unicode character and placed into the right place in String.\r
- @retval EFI_BUFFER_TOO_SMALL StringSizeInBytes is smaller than 2 * N + 1the number of bytes required to\r
- complete the convertion. \r
-**/\r
-RETURN_STATUS\r
-EFIAPI\r
-BufToHexString (\r
- IN OUT CHAR16 *String,\r
- IN OUT UINTN *StringLen,\r
- IN CONST UINT8 *Buffer,\r
- IN UINTN BufferSizeInBytes\r
- )\r
-{\r
- UINTN Idx;\r
- UINT8 Byte;\r
- UINTN StrLen;\r
-\r
- //\r
- // Make sure string is either passed or allocate enough.\r
- // It takes 2 Unicode characters (4 bytes) to represent 1 byte of the binary buffer.\r
- // Plus the Unicode termination character.\r
- //\r
- StrLen = BufferSizeInBytes * 2;\r
- if (StrLen > ((*StringLen) - 1)) {\r
- *StringLen = StrLen + 1;\r
- return RETURN_BUFFER_TOO_SMALL;\r
- }\r
-\r
- *StringLen = StrLen + 1;\r
- //\r
- // Ends the string.\r
- //\r
- String[StrLen] = L'\0'; \r
-\r
- for (Idx = 0; Idx < BufferSizeInBytes; Idx++) {\r
-\r
- Byte = Buffer[Idx];\r
- String[StrLen - 1 - Idx * 2] = NibbleToHexChar (Byte);\r
- String[StrLen - 2 - Idx * 2] = NibbleToHexChar ((UINT8)(Byte >> 4));\r
- }\r
-\r
- return RETURN_SUCCESS;\r
-}\r
-\r
-\r
-/**\r
- Convert a Unicode string consisting of hexadecimal characters to a output byte buffer.\r
-\r
- This function converts a Unicode string consisting of characters in the range of Hexadecimal\r
- character (L'0' to L'9', L'A' to L'F' and L'a' to L'f') to a output byte buffer. The function will stop\r
- at the first non-hexadecimal character or the NULL character. The convertion process can be\r
- simply viewed as the reverse operations defined by BufToHexString. Two Unicode characters will be \r
- converted into one byte. The first Unicode character represents the Most Significant Nibble and the\r
- second Unicode character represents the Least Significant Nibble in the output byte. \r
- The first pair of Unicode characters represents the last byte in the output buffer. The second pair of Unicode \r
- characters represent the the byte preceding the last byte. This rule applies to the rest pairs of bytes. \r
- The last pair represent the first byte in the output buffer. \r
-\r
- For example, a Unciode String L"12345678" will be converted into a buffer wil the following bytes \r
- (first byte is the byte in the lowest memory address): "0x78, 0x56, 0x34, 0x12".\r
-\r
- If String has N valid hexadecimal characters for conversion, the caller must make sure Buffer is at least \r
- N/2 (if N is even) or (N+1)/2 (if N if odd) bytes. \r
-\r
- @param Buffer The output buffer allocated by the caller.\r
- @param BufferSizeInBytes On input, the size in bytes of Buffer. On output, it is updated to \r
- contain the size of the Buffer which is actually used for the converstion.\r
- For Unicode string with 2*N hexadecimal characters (not including the \r
- tailing NULL character), N bytes of Buffer will be used for the output.\r
- @param String The input hexadecimal string.\r
- @param ConvertedStrLen The number of hexadecimal characters used to produce content in output\r
- buffer Buffer.\r
-\r
- @retval RETURN_BUFFER_TOO_SMALL The input BufferSizeInBytes is too small to hold the output. BufferSizeInBytes\r
- will be updated to the size required for the converstion.\r
- @retval RETURN_SUCCESS The convertion is successful or the first Unicode character from String\r
- is hexadecimal. If ConvertedStrLen is not NULL, it is updated\r
- to the number of hexadecimal character used for the converstion.\r
-**/\r
-RETURN_STATUS\r
-EFIAPI\r
-HexStringToBuf (\r
- OUT UINT8 *Buffer, \r
- IN OUT UINTN *BufferSizeInBytes,\r
- IN CONST CHAR16 *String,\r
- OUT UINTN *ConvertedStrLen OPTIONAL\r
- )\r
-{\r
- UINTN HexCnt;\r
- UINTN Idx;\r
- UINTN BufferLength;\r
- UINT8 Digit;\r
- UINT8 Byte;\r
-\r
- //\r
- // Find out how many hex characters the string has.\r
- //\r
- for (Idx = 0, HexCnt = 0; IsHexDigit (&Digit, String[Idx]); Idx++, HexCnt++);\r
-\r
- if (HexCnt == 0) {\r
- *ConvertedStrLen = 0;\r
- return RETURN_SUCCESS;\r
- }\r
- //\r
- // Two Unicode characters make up 1 buffer byte. Round up.\r
- //\r
- BufferLength = (HexCnt + 1) / 2; \r
-\r
- //\r
- // Test if buffer is passed enough.\r
- //\r
- if (BufferLength > (*BufferSizeInBytes)) {\r
- *BufferSizeInBytes = BufferLength;\r
- return RETURN_BUFFER_TOO_SMALL;\r
- }\r
-\r
- *BufferSizeInBytes = BufferLength;\r
-\r
- for (Idx = 0; Idx < HexCnt; Idx++) {\r
-\r
- IsHexDigit (&Digit, String[HexCnt - 1 - Idx]);\r
-\r
- //\r
- // For odd charaters, write the lower nibble for each buffer byte,\r
- // and for even characters, the upper nibble.\r
- //\r
- if ((Idx & 1) == 0) {\r
- Byte = Digit;\r
- } else {\r
- Byte = Buffer[Idx / 2];\r
- Byte &= 0x0F;\r
- Byte = (UINT8) (Byte | Digit << 4);\r
- }\r
-\r
- Buffer[Idx / 2] = Byte;\r
- }\r
-\r
- if (ConvertedStrLen != NULL) {\r
- *ConvertedStrLen = HexCnt;\r
- }\r
-\r
- return RETURN_SUCCESS;\r
-}\r
-\r
-\r
-/**\r
- Test if a Unicode character is a hexadecimal digit. If true, the input\r
- Unicode character is converted to a byte. \r
-\r
- This function tests if a Unicode character is a hexadecimal digit. If true, the input\r
- Unicode character is converted to a byte. For example, Unicode character\r
- L'A' will be converted to 0x0A. \r
-\r
- If Digit is NULL, then ASSERT().\r
- \r
- @param Digit The output hexadecimal digit.\r
- @param Char The input Unicode character.\r
-\r
- @retval TRUE Char is in the range of Hexadecimal number. Digit is updated\r
- to the byte value of the number.\r
- @retval FALSE Char is not in the range of Hexadecimal number. Digit is keep\r
- intact.\r
- \r
-**/\r
-BOOLEAN\r
-IsHexDigit (\r
- OUT UINT8 *Digit,\r
- IN CHAR16 Char\r
- )\r
-{\r
- ASSERT (Digit != NULL);\r
- \r
- if ((Char >= L'0') && (Char <= L'9')) {\r
- *Digit = (UINT8) (Char - L'0');\r
- return TRUE;\r
- }\r
-\r
- if ((Char >= L'A') && (Char <= L'F')) {\r
- *Digit = (UINT8) (Char - L'A' + 0x0A);\r
- return TRUE;\r
- }\r
-\r
- if ((Char >= L'a') && (Char <= L'f')) {\r
- *Digit = (UINT8) (Char - L'a' + 0x0A);\r
- return TRUE;\r
- }\r
-\r
- return FALSE;\r
-}\r
-\r
-\r