source: Vago/quazip-0.7.2/doc/latex/classQuaChecksum32.tex@ 1049

\section{QuaChecksum32 Class Reference}
\label{classQuaChecksum32}\index{QuaChecksum32@{QuaChecksum32}}


Checksum interface.  




{\ttfamily \#include $<$quazip/quachecksum32.h$>$}



Inheritance diagram for QuaChecksum32:
\nopagebreak
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\begin{center}
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\includegraphics[width=190pt]{classQuaChecksum32__inherit__graph}
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\subsection*{Public Member Functions}
\begin{DoxyCompactItemize}
\item 
virtual quint32 {\bf calculate} (const {\bf QByteArray} \&data)=0
\begin{DoxyCompactList}\small\item\em Calculates the checksum for data. \end{DoxyCompactList}\item 
virtual void {\bf reset} ()=0\label{classQuaChecksum32_ad3f5db3c76b00069db9bda333cb49d57}

\begin{DoxyCompactList}\small\item\em Resets the calculation on a checksun for a stream. \end{DoxyCompactList}\item 
virtual void {\bf update} (const {\bf QByteArray} \&buf)=0
\begin{DoxyCompactList}\small\item\em Updates the calculated checksum for the stream. \end{DoxyCompactList}\item 
virtual quint32 {\bf value} ()=0
\begin{DoxyCompactList}\small\item\em Value of the checksum calculated for the stream passed throw \doxyref{update()}{p.}{classQuaChecksum32_a63a6ed3171f9243214d307da67557f7e}. \end{DoxyCompactList}\end{DoxyCompactItemize}


\subsection{Detailed Description}
Checksum interface. 

This is an interface for 32 bit checksums. Classes implementing this interface can calcunate a certin checksum in a single step: 
\begin{DoxyCode}
 QChecksum32 *crc32 = new QuaCrc32(); 
 rasoult = crc32->calculate(data);
\end{DoxyCode}
 or by streaming the data: 
\begin{DoxyCode}
 QChecksum32 *crc32 = new QuaCrc32(); 
 while(!fileA.atEnd())
     crc32->update(fileA.read(bufSize));
 resoultA = crc32->value();
 crc32->reset();
 while(!fileB.atEnd())
     crc32->update(fileB.read(bufSize));
 resoultB = crc32->value();
\end{DoxyCode}
 

\subsection{Member Function Documentation}
\index{QuaChecksum32@{QuaChecksum32}!calculate@{calculate}}
\index{calculate@{calculate}!QuaChecksum32@{QuaChecksum32}}
\subsubsection[{calculate}]{\setlength{\rightskip}{0pt plus 5cm}virtual quint32 QuaChecksum32::calculate (
\begin{DoxyParamCaption}
\item[{const {\bf QByteArray} \&}]{data}
\end{DoxyParamCaption}
)\hspace{0.3cm}{\ttfamily  [pure virtual]}}\label{classQuaChecksum32_a14d800fcfd55b2ae11ef07d3924fe0b1}


Calculates the checksum for data. 

{\itshape data\/} source data \begin{DoxyReturn}{Returns}
data checksum
\end{DoxyReturn}
This function has no efect on the value returned by \doxyref{value()}{p.}{classQuaChecksum32_afd836e7534194fce08356be6a8336da7}. 

Implemented in {\bf QuaAdler32} \doxyref{}{p.}{classQuaAdler32_a350e84fd000ebfa3c33503336a7b21bb}, and {\bf QuaCrc32} \doxyref{}{p.}{classQuaCrc32_aaf6fdf6e36e55c97bf9eab6ec65ecb9e}.

\index{QuaChecksum32@{QuaChecksum32}!update@{update}}
\index{update@{update}!QuaChecksum32@{QuaChecksum32}}
\subsubsection[{update}]{\setlength{\rightskip}{0pt plus 5cm}virtual void QuaChecksum32::update (
\begin{DoxyParamCaption}
\item[{const {\bf QByteArray} \&}]{buf}
\end{DoxyParamCaption}
)\hspace{0.3cm}{\ttfamily  [pure virtual]}}\label{classQuaChecksum32_a63a6ed3171f9243214d307da67557f7e}


Updates the calculated checksum for the stream. 

{\itshape buf\/} next portion of data from the stream 

Implemented in {\bf QuaAdler32} \doxyref{}{p.}{classQuaAdler32_aba24f7b16aa0cdc26f81a9ad687fc653}, and {\bf QuaCrc32} \doxyref{}{p.}{classQuaCrc32_a5015d80e04afe6e6d094155b7e99888e}.

\index{QuaChecksum32@{QuaChecksum32}!value@{value}}
\index{value@{value}!QuaChecksum32@{QuaChecksum32}}
\subsubsection[{value}]{\setlength{\rightskip}{0pt plus 5cm}virtual quint32 QuaChecksum32::value (
\begin{DoxyParamCaption}
{}
\end{DoxyParamCaption}
)\hspace{0.3cm}{\ttfamily  [pure virtual]}}\label{classQuaChecksum32_afd836e7534194fce08356be6a8336da7}


Value of the checksum calculated for the stream passed throw \doxyref{update()}{p.}{classQuaChecksum32_a63a6ed3171f9243214d307da67557f7e}. 

\begin{DoxyReturn}{Returns}
checksum 
\end{DoxyReturn}


Implemented in {\bf QuaAdler32} \doxyref{}{p.}{classQuaAdler32_a2022e1db95c23cef220b335e44d74fb1}, and {\bf QuaCrc32} \doxyref{}{p.}{classQuaCrc32_a957ce46a53862f75c89d6a3ac4f73389}.



The documentation for this class was generated from the following file:\begin{DoxyCompactItemize}
\item 
quazip/quachecksum32.h\end{DoxyCompactItemize}