Iconv: Grow buffer size to continue iconv if output buffer is shortage #1094
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出力バッファの長さが不足したときサイズを拡大してiconvの変換処理を続行するように修正します。
出力バッファの初期サイズは入力に対して2倍以上の長さを確保します。
修正前は出力バッファの長さが不足したとき変換処理を中断して途中結果を返していました。
関連のissue: #76