gecko-dev/xpcom/ds/nsManifestLineReader.h

90 строки
2.3 KiB
C++

/* -*- 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 nsManifestLineReader_h__
#define nsManifestLineReader_h__
#include "nspr.h"
#include "nsDebug.h"
class nsManifestLineReader
{
public:
nsManifestLineReader() : mBase(nullptr) {}
~nsManifestLineReader() {}
void Init(char* base, uint32_t flen)
{
mBase = mCur = mNext = base;
mLength = 0;
mLimit = base + flen;
}
bool NextLine()
{
if(mNext >= mLimit)
return false;
mCur = mNext;
mLength = 0;
while(mNext < mLimit)
{
if(IsEOL(*mNext))
{
*mNext = '\0';
for(++mNext; mNext < mLimit; ++mNext)
if(!IsEOL(*mNext))
break;
return true;
}
++mNext;
++mLength;
}
return false;
}
int ParseLine(char** chunks, int* lengths, int maxChunks)
{
NS_ASSERTION(mCur && maxChunks && chunks, "bad call to ParseLine");
int found = 0;
chunks[found++] = mCur;
if(found < maxChunks)
{
char *lastchunk = mCur;
int *lastlength = lengths;
for(char* cur = mCur; *cur; cur++)
{
if(*cur == ',')
{
*cur = 0;
// always fill in the previous chunk's length
*lastlength++ = cur - lastchunk;
chunks[found++] = lastchunk = cur+1;
if(found == maxChunks)
break;
}
}
// crazy pointer math - calculate the length of the final chunk
*lastlength = (mCur + mLength) - lastchunk;
}
return found;
}
char* LinePtr() {return mCur;}
uint32_t LineLength() {return mLength;}
bool IsEOL(char c) {return c == '\n' || c == '\r';}
private:
char* mCur;
uint32_t mLength;
char* mNext;
char* mBase;
char* mLimit;
};
#endif