INTL_StrToUnicodeLen

Return memory requirement for INTL_StrToUnicode. Return the maximum memory requirement for text converted from the specified encoding to Unicode. Call this to prepare memory for INTL_StrToUnicode. The difference between INTL_TextToUnicodeLen is the input string is specified by a NULL terminated string.

Returns:: Size of Unicode to store the converted output (in UCS-2 units not bytes)
Parameters:: encoding - Specifies the encoding of text in src
src - Specifies the text to be converted
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