| /* |
| * Copyright (C) 2012, Robin Rosenberg |
| * Copyright (C) 2010, 2013 Marc Strapetz <marc.strapetz@syntevo.com> and others |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Distribution License v. 1.0 which is available at |
| * https://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| package org.eclipse.jgit.util.io; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.eclipse.jgit.diff.RawText; |
| |
| /** |
| * An InputStream that expands LF to CRLF. |
| * |
| * Existing CRLF are not expanded to CRCRLF, but retained as is. |
| * |
| * Optionally, a binary check on the first 8000 bytes is performed and in case |
| * of binary files, canonicalization is turned off (for the complete file). |
| */ |
| public class AutoCRLFInputStream extends InputStream { |
| |
| static final int BUFFER_SIZE = 8096; |
| |
| private final byte[] single = new byte[1]; |
| |
| private final byte[] buf = new byte[BUFFER_SIZE]; |
| |
| private final InputStream in; |
| |
| private int cnt; |
| |
| private int ptr; |
| |
| private boolean isBinary; |
| |
| private boolean detectBinary; |
| |
| private byte last; |
| |
| /** |
| * Creates a new InputStream, wrapping the specified stream |
| * |
| * @param in |
| * raw input stream |
| * @param detectBinary |
| * whether binaries should be detected |
| * @since 2.0 |
| */ |
| public AutoCRLFInputStream(InputStream in, boolean detectBinary) { |
| this.in = in; |
| this.detectBinary = detectBinary; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int read() throws IOException { |
| final int read = read(single, 0, 1); |
| return read == 1 ? single[0] & 0xff : -1; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int read(byte[] bs, int off, int len) throws IOException { |
| if (len == 0) |
| return 0; |
| |
| if (cnt == -1) |
| return -1; |
| |
| int i = off; |
| final int end = off + len; |
| |
| while (i < end) { |
| if (ptr == cnt && !fillBuffer()) |
| break; |
| |
| byte b = buf[ptr++]; |
| if (isBinary || b != '\n') { |
| // Logic for binary files ends here |
| bs[i++] = last = b; |
| continue; |
| } |
| |
| if (b == '\n') { |
| if (last == '\r') { |
| bs[i++] = last = b; |
| continue; |
| } |
| bs[i++] = last = '\r'; |
| ptr--; |
| } else |
| bs[i++] = last = b; |
| } |
| int n = i == off ? -1 : i - off; |
| if (n > 0) |
| last = bs[i - 1]; |
| return n; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void close() throws IOException { |
| in.close(); |
| } |
| |
| private boolean fillBuffer() throws IOException { |
| cnt = 0; |
| while (cnt < buf.length) { |
| int n = in.read(buf, cnt, buf.length - cnt); |
| if (n < 0) { |
| break; |
| } |
| cnt += n; |
| } |
| if (cnt < 1) { |
| cnt = -1; |
| return false; |
| } |
| if (detectBinary) { |
| isBinary = RawText.isBinary(buf, cnt); |
| detectBinary = false; |
| } |
| ptr = 0; |
| return true; |
| } |
| } |