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alter FUNCTION dbo.base64_decode
(
@encoded_text varchar(8000)
)
RETURNS varchar(8000)
AS
BEGIN
DECLARE
@output varbinary(8000),
@block_start int,
@encoded_length int,
@decoded_length int,
@mapr binary(122)
IF LEN(@encoded_text) & 3 > 0
OR @encoded_text LIKE '%[^ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=]%' COLLATE Latin1_General_Bin
RETURN NULL
SET @output = 0x
-- The nth byte of @mapr contains the base64 value of the character with an ASCII value of n.
-- eg. 65th byte = 0x00 = 0 = value of 'A'
SET @mapr =
0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF -- 1-33
+ 0xFFFFFFFFFFFFFFFFFFFF3EFFFFFF3F3435363738393A3B3C3DFFFFFF00FFFFFF -- 33-64
+ 0x000102030405060708090A0B0C0D0E0F10111213141516171819FFFFFFFFFFFF -- 65-96
+ 0x1A1B1C1D1E1F202122232425262728292A2B2C2D2E2F30313233 -- 97-122
--get the number of blocks to be decoded
SET @encoded_length = LEN(@encoded_text)
SET @decoded_length = @encoded_length / 4 * 3
--for each block
SET @block_start = 1
WHILE @block_start < @encoded_length
BEGIN
--decode the block and add to output
--BINARY values between 1 and 4 bytes can be implicitly cast to INT
SET @output = @output +
CAST(CAST(
SUBSTRING(@mapr, ASCII(SUBSTRING(@encoded_text, @block_start , 1)), 1) * 262144
+ SUBSTRING(@mapr, ASCII(SUBSTRING(@encoded_text, @block_start + 1, 1)), 1) * 4096
+ SUBSTRING(@mapr, ASCII(SUBSTRING(@encoded_text, @block_start + 2, 1)), 1) * 64
+ SUBSTRING(@mapr, ASCII(SUBSTRING(@encoded_text, @block_start + 3, 1)), 1)
AS int) AS binary(3))
SET @block_start = @block_start + 4
END
IF RIGHT(@encoded_text, 2) = '=='
SET @decoded_length = @decoded_length - 2
ELSE IF RIGHT(@encoded_text, 1) = '='
SET @decoded_length = @decoded_length - 1
RETURN LEFT(CAST(@output AS varchar(8000)), @decoded_length)
END
GO
CREATE FUNCTION dbo.ucs2_to_utf8(
@ucs2 varbinary(max)
)
RETURNS varbinary(max)
AS
/*
U-00000000 ... U-0000007F 0xxxxxxx
U-00000080 ... U-000007FF 110xxxxx 10xxxxxx
U-00000800 ... U-0000FFFF 1110xxxx 10xxxxxx 10xxxxxx
*/
BEGIN
DECLARE
@output varbinary(max),
@i int,
@code int
SET @output = 0x
SET @i = 1
WHILE 1 = 1
BEGIN
SET @code = CAST(SUBSTRING(@ucs2,@i+1,1) + SUBSTRING(@ucs2,@i,1) AS int)
IF @code = 0
BREAK
IF @code >= 0x0800
SET @output = @output +
CAST(@code / 4096 + 224 AS binary(1)) +
CAST((@code % 4096) / 64 + 128 AS binary(1)) +
CAST((@code % 4096) % 64 + 128 AS binary(1))
ELSE IF @code >= 0x0080
SET @output = @output +
CAST(@code / 64 + 192 AS binary(1)) +
CAST(@code % 64 + 128 AS binary(1))
ELSE
SET @output = @output + CAST(@code AS binary(1))
SET @i = @i + 2
END
RETURN @output
END
CREATE FUNCTION dbo.utf8_to_ucs2(
@utf8 varbinary(max)
)
RETURNS varbinary(max)
AS
BEGIN
DECLARE
@output varbinary(max),
@i int,
@next int,
@code int,
@tmp varbinary(1)
SET @output = 0x
SET @i = 1
SET @next = 0
WHILE 1 = 1
BEGIN
SET @tmp = SUBSTRING(@utf8,@i,1)
IF @tmp = 0x
BREAK
IF @tmp BETWEEN 0x01 AND 0x7F
SET @output = @output + @tmp + 0x00
ELSE IF @tmp BETWEEN 0xC0 AND 0xDF
BEGIN
SET @code = (CAST(@tmp AS int) & 0x1F) * 64
SET @next = 1
END
ELSE IF @tmp BETWEEN 0xE0 AND 0xEF
BEGIN
SET @code = (CAST(@tmp AS int) & 0x0F) * 4096
SET @next = 2
END
ELSE IF @tmp BETWEEN 0x80 AND 0xBF AND @next IN (1,2)
BEGIN
IF @next = 1
BEGIN
SET @code = @code + (CAST(@tmp AS int) & 0x3F)
SET @output = @output + CAST(NCHAR(@code) AS binary(2))
END
IF @next = 2
SET @code = @code + (CAST(@tmp AS int) & 0x3F) * 64
SET @next = @next - 1
END
ELSE
RETURN NULL
SET @i = @i + 1
END
RETURN @output
END
SELECT CAST(dbo.utf8_to_ucs2(dbo.base64_decode('6K+277yM6Kej5LiN5Ye65p2l5ZWK77yM5ZKL5Yqe5Yqe57G7')) AS nvarchar(max))
CREATE FUNCTION dbo.base64_decode
(
@encoded_text varchar(max)
)
RETURNS varbinary(max)
AS
BEGIN
DECLARE
@output varbinary(max),
@block_start int,
@encoded_length int,
@decoded_length int,
@mapr binary(122)
IF LEN(@encoded_text) & 3 > 0
OR @encoded_text LIKE '%[^ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=]%' COLLATE Latin1_General_Bin
RETURN NULL
SET @output = 0x
-- The nth byte of @mapr contains the base64 value of the character with an ASCII value of n.
-- eg. 65th byte = 0x00 = 0 = value of 'A'
SET @mapr =
0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF -- 1-33
+ 0xFFFFFFFFFFFFFFFFFFFF3EFFFFFF3F3435363738393A3B3C3DFFFFFF00FFFFFF -- 33-64
+ 0x000102030405060708090A0B0C0D0E0F10111213141516171819FFFFFFFFFFFF -- 65-96
+ 0x1A1B1C1D1E1F202122232425262728292A2B2C2D2E2F30313233 -- 97-122
--get the number of blocks to be decoded
SET @encoded_length = LEN(@encoded_text)
SET @decoded_length = @encoded_length / 4 * 3
--for each block
SET @block_start = 1
WHILE @block_start < @encoded_length
BEGIN
--decode the block and add to output
--BINARY values between 1 and 4 bytes can be implicitly cast to INT
SET @output = @output +
CAST(CAST(
SUBSTRING(@mapr, ASCII(SUBSTRING(@encoded_text, @block_start , 1)), 1) * 262144
+ SUBSTRING(@mapr, ASCII(SUBSTRING(@encoded_text, @block_start + 1, 1)), 1) * 4096
+ SUBSTRING(@mapr, ASCII(SUBSTRING(@encoded_text, @block_start + 2, 1)), 1) * 64
+ SUBSTRING(@mapr, ASCII(SUBSTRING(@encoded_text, @block_start + 3, 1)), 1)
AS int) AS binary(3))
SET @block_start = @block_start + 4
END
IF RIGHT(@encoded_text, 2) = '=='
SET @decoded_length = @decoded_length - 2
ELSE IF RIGHT(@encoded_text, 1) = '='
SET @decoded_length = @decoded_length - 1
RETURN SUBSTRING(@output, 1, @decoded_length)
END