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1 | !7 |
2 | |
3 | set flag LeanMode. |
4 | |
5 | p {
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6 | ByteCountingLineReader r = new(new ByteArrayInputStream(toUtf8("Hello\r\nWorld\n")));
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7 | |
8 | S line = null; |
9 | do {
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10 | long count = r.byteCount(); |
11 | line = r.readLine(); |
12 | System.out.println("Line at byte " + count + ": " + line);
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13 | } while (line != null); |
14 | |
15 | r.close(); |
16 | } |
17 | |
18 | static class ByteCountingLineReader implements Closeable {
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19 | InputStream in; |
20 | long _byteCount; |
21 | int bufferedByte = -1; |
22 | boolean ended; |
23 | |
24 | // in should be a buffered stream! |
25 | ByteCountingLineReader(InputStream in) {
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26 | this.in = in; |
27 | } |
28 | |
29 | ByteCountingLineReader(File f) throws IOException {
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30 | in = new BufferedInputStream(new FileInputStream(f), 65536); |
31 | } |
32 | |
33 | String readLine() throws IOException {
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34 | ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
35 | if (ended) null; |
36 | while true {
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37 | int c = read(); |
38 | if (ended && baos.size() == 0) null; |
39 | if (ended || c == '\n') break; |
40 | if (c == '\r') {
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41 | c = read(); |
42 | if (c != '\n' && !ended) |
43 | bufferedByte = c; |
44 | break; |
45 | } |
46 | baos.write(c); |
47 | } |
48 | return fromUtf8(baos.toByteArray()); |
49 | } |
50 | |
51 | int read() throws IOException {
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52 | if (bufferedByte >= 0) {
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53 | int b = bufferedByte; |
54 | bufferedByte = -1; |
55 | return b; |
56 | } |
57 | int c = in.read(); |
58 | if (c < 0) ended = true; else ++_byteCount; |
59 | return c; |
60 | } |
61 | |
62 | long byteCount() {
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63 | return bufferedByte >= 0 ? _byteCount-1 : _byteCount; |
64 | } |
65 | |
66 | public void close() throws IOException {
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67 | if (in != null) try {
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68 | in.close(); |
69 | } finally { in = null; }
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70 | } |
71 | |
72 | bool ended() { ret ended; }
|
73 | } |
Posted at https://stackoverflow.com/questions/15092869/how-to-know-bytes-readoffset-of-bufferedreader?rq=1
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| Snippet ID: | #1014159 |
| Snippet name: | ByteCountingLineReader SSCCE for StackOverflow |
| Eternal ID of this version: | #1014159/12 |
| Text MD5: | 8cbb17011896b4764e057a01a6b1387d |
| Transpilation MD5: | 02b08f4a3dc953d0372068ac3485320a |
| Author: | stefan |
| Category: | javax / io |
| Type: | JavaX source code (desktop) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2018-04-15 14:13:03 |
| Source code size: | 1668 bytes / 73 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 377 / 918 |
| Version history: | 11 change(s) |
| Referenced in: | [show references] |