text to startconverting
@param count the number of characters in textto convert
@throws IndexOutOfBoundsException if start or start + count isout of bounds
@throws NullPointerException if text is null
NULL only if destSize is 0.
@param destStart The start of the range of the destination buffer to use.
@param destSize The size (capacity) of the destination buffer.If destSize is 0, then no output is produced, but the necessary buffer size is returned ("preflighting"). This does not validate the text against the options, for example, if letters are being unshaped, and spaces are being consumed following lamalef, this will not detect a lamalef without a corresponding space. An error will be thrown when the actual conversion is attempted.
@return The number of chars written to the destination buffer.If an error occurs, then no output was written, or it may be incomplete.
@throws ArabicShapingException if the text cannot be converted according to the options.
@stable ICU 2.0
text to start converting
@param count the number of characters in textto convert
@throws IndexOutOfBoundsException if start or start + count isout of bounds
@throws NullPointerException if text is null
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