Add unsigned char cast
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@ -351,7 +351,7 @@ binascii_a2b_base64(self, args)
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if ( this_ch == BASE64_PAD )
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npad++;
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this_ch = table_a2b_base64[(*ascii_data) & 0x7f];
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if ( this_ch == -1 ) continue;
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if ( this_ch == (unsigned char) -1 ) continue;
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/*
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** Shift it in on the low end, and see if there's
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** a byte ready for output.
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