/usr/include/thunderbird/nsReadLine.h is in thunderbird-dev 1:38.6.0+build1-0ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsReadLine_h__
#define nsReadLine_h__
#include "nsIInputStream.h"
#include "mozilla/Likely.h"
/**
* @file
* Functions to read complete lines from an input stream.
*
* To properly use the helper function in here (NS_ReadLine) the caller should
* create a nsLineBuffer<T> with new, and pass it to NS_ReadLine every time it
* wants a line out.
*
* When done, the object should be deleted.
*/
/**
* @internal
* Buffer size. This many bytes will be buffered. If a line is longer than this,
* the partial line will be appended to the out parameter of NS_ReadLine and the
* buffer will be emptied.
* Note: if you change this constant, please update the regression test in
* netwerk/test/unit/test_readline.js accordingly (bug 397850).
*/
#define kLineBufferSize 4096
/**
* @internal
* Line buffer structure, buffers data from an input stream.
* The buffer is empty when |start| == |end|.
* Invariant: |start| <= |end|
*/
template<typename CharT>
class nsLineBuffer {
public:
nsLineBuffer() : start(buf), end(buf) { }
CharT buf[kLineBufferSize+1];
CharT* start;
CharT* end;
};
/**
* Read a line from an input stream. Lines are separated by '\r' (0x0D) or '\n'
* (0x0A), or "\r\n" or "\n\r".
*
* @param aStream
* The stream to read from
* @param aBuffer
* The line buffer to use. A single line buffer must not be used with
* different input streams.
* @param aLine [out]
* The string where the line will be stored.
* @param more [out]
* Whether more data is available in the buffer. If true, NS_ReadLine may
* be called again to read further lines. Otherwise, further calls to
* NS_ReadLine will return an error.
*
* @retval NS_OK
* Read successful
* @retval error
* Input stream returned an error upon read. See
* nsIInputStream::read.
*/
template<typename CharT, class StreamType, class StringType>
nsresult
NS_ReadLine (StreamType* aStream, nsLineBuffer<CharT> * aBuffer,
StringType & aLine, bool *more)
{
CharT eolchar = 0; // the first eol char or 1 after \r\n or \n\r is found
aLine.Truncate();
while (1) { // will be returning out of this loop on eol or eof
if (aBuffer->start == aBuffer->end) { // buffer is empty. Read into it.
uint32_t bytesRead;
nsresult rv = aStream->Read(aBuffer->buf, kLineBufferSize, &bytesRead);
if (NS_FAILED(rv) || MOZ_UNLIKELY(bytesRead == 0)) {
*more = false;
return rv;
}
aBuffer->start = aBuffer->buf;
aBuffer->end = aBuffer->buf + bytesRead;
*(aBuffer->end) = '\0';
}
/*
* Walk the buffer looking for an end-of-line.
* There are 3 cases to consider:
* 1. the eol char is the last char in the buffer
* 2. the eol char + one more char at the end of the buffer
* 3. the eol char + two or more chars at the end of the buffer
* we need at least one char after the first eol char to determine if
* it's a \r\n or \n\r sequence (and skip over it), and we need one
* more char after the end-of-line to set |more| correctly.
*/
CharT* current = aBuffer->start;
if (MOZ_LIKELY(eolchar == 0)) {
for ( ; current < aBuffer->end; ++current) {
if (*current == '\n' || *current == '\r') {
eolchar = *current;
*current++ = '\0';
aLine.Append(aBuffer->start);
break;
}
}
}
if (MOZ_LIKELY(eolchar != 0)) {
for ( ; current < aBuffer->end; ++current) {
if ((eolchar == '\r' && *current == '\n') ||
(eolchar == '\n' && *current == '\r')) {
eolchar = 1;
continue;
}
aBuffer->start = current;
*more = true;
return NS_OK;
}
}
if (eolchar == 0)
aLine.Append(aBuffer->start);
aBuffer->start = aBuffer->end; // mark the buffer empty
}
}
#endif // nsReadLine_h__
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