package?com.ctreber.aclib.codec;

import?java.io.IOException;

/**
?*?

?*?Byte?stream?decoder?for?1?2?and?4?byte?values?in?big?or?little?endian
?*?format.
?*?

?*?@author?©?Christian?Treber?ct@ctreber.com
?*/
public?abstract?class?AbstractDecoder?{
????/**?Highest?order?byte?comes?first.?*/
????public?static?final?int?BIG_ENDIAN?=?0;

????/**?Lowest?order?byte?comes?first.?*/
????public?static?final?int?LITTLE_ENDIAN?=?1;

????/**?Determines?the?byte?order?in?multi?byte?values.?*/
????private?int?_endianness?=?BIG_ENDIAN;

????protected?long?_pos;

????/**?Static?buffer?to?read?values?w/o?allocating?an?array?every?time.?*/
????private?final?byte[]?_readBuf?=?new?byte[4];

????/**
?????*?@return?A?one?byte?value?（aka?BYTE?unsigned?char）
?????*?@throws?java.io.IOException
?????*/
????public?short?readUInt1（）?throws?IOException?{
????????return?（short）?readValue（1）;
????}

????/**
?????*?@return?A?two?byte?value?（aka?WORD?unsigned?short）
?????*?@throws?java.io.IOException
?????*/
????public?int?readUInt2（）?throws?IOException?{
????????return?（int）?readValue（2）;
????}

????/**
?????*?@return?A?four?byte?value?（aka?DWORD?unsigned?long）.
?????*?@throws?java.io.IOException
?????*/
????public?long?readUInt4（）?throws?IOException?{
????????return?readValue（4）;
????}

????/**
?????*?@param?pEndianess
?????*????????????The?byte?order
?????*?@see?#BIG_ENDIAN
?????*?@see?#LITTLE_ENDIAN
?????*/
????public?void?setEndianess（final?int?pEndianess）?{
????????_endianness?=?pEndianess;
????}

????/**
?????*?@return?Current?position?in?file
?????*/
????public?long?getPos（）?{
????????return?_pos;
????}

????/**
?????*?@param?pPos
?????*????????????Position?to?advance?to.?Nothing?will?happen?if?the?position
?????*????????????has?already?been?passed.
?????*?@throws?java.io.IOException
?????*/
????public?abstract?void?seek（long?pPos）?throws?IOException;

????/**
?????*?Implemented?by?a?specific?decoder.
?????*?@param?pBytes
?????*????????????Bytes?to?read
?????*?@param?pBuffer
?????*????????????The?buffer?to?write?the?read?bytes?to.?If?null?a?buffer?is
?????*????????????reserved.
?????*?@return?Array?with?the?bytes?read.
?????*?@throws?java.io.IOException
?????*/
????public?abstract?byte[]?readBytes（long?pBytes?byte[]?pBuffer）
????????????throws?IOException;

????protected?long?readValue（final?int?pBytes）?throws?IOException?{
????????readBytes（pBytes?_readBuf）;
????????if?（pBytes?==?1）?{
????????????//?Shortcut:?endianness?plays?no?role?here.
????????????return?_readBuf[0]?&?0xFF;
????????}

????????long?lValue?=?0;
????????if?（_endianness?==?BIG_ENDIAN）?{
????????????for?（int?lByteNo?=?0;?lByteNo?????????????????lValue?<<=?8;
????????????????lValue?+=?_readBuf[lByteNo]?&?0xff;
????????????}
????????}?else?{
????????????for?（int?lByteNo?=?pBytes?-?1;?lByteNo?>=?0;?lByteNo--）?{
????????????????lValue?<<=?8;
????????????????lValue?+=?_readBuf[lByteNo]?&?0xff;
????????????}
????????}

????????return?lValue;
????}

????/**
?????*?Cal

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2012-05-16?10:15??yoyo\
?????目錄???????????0??2009-08-02?00:27??yoyo\lib\
?????文件???????46725??2009-08-02?00:27??yoyo\lib\commons-codec-1.3.jar
?????文件??????305001??2009-08-02?00:27??yoyo\lib\commons-httpclient-3.1.jar
?????文件???????52915??2009-08-02?00:27??yoyo\lib\commons-logging-1.1.jar
?????文件???????26202??2009-08-02?00:27??yoyo\lib\commons-logging-api.jar
?????文件??????266881??2009-08-02?00:27??yoyo\lib\examples.jar
?????文件??????103640??2009-08-02?00:27??yoyo\lib\jflac-1.2.jar
?????文件??????105446??2009-08-02?00:27??yoyo\lib\jl1.0.jar
?????文件??????138975??2009-08-02?00:27??yoyo\lib\jmactritonusspi1.74.jar
?????文件??????288699??2009-08-02?00:27??yoyo\lib\jna.jar
?????文件????????6839??2009-08-02?00:27??yoyo\lib\jogg-0.0.7.jar
?????文件???????58917??2009-08-02?00:27??yoyo\lib\jorbis-0.0.15.jar
?????文件???????99833??2009-08-02?00:27??yoyo\lib\jspeex0.9.7.jar
?????文件??????161477??2009-08-02?00:27??yoyo\lib\junit-4.4.jar
?????文件???????12578??2009-08-02?00:27??yoyo\lib\kj_dsp1.1.jar
?????文件???????24538??2009-08-02?00:27??yoyo\lib\mp3spi1.9.4.jar
?????文件??????102723??2009-08-02?00:27??yoyo\lib\tritonus_share.jar
?????文件???????13776??2009-08-02?00:27??yoyo\lib\vorbisspi1.0.2.jar
?????文件????????3477??2009-08-02?00:32??yoyo\ReadMe.txt
?????文件??????????24??2012-05-15?22:33??yoyo\run.bat
?????目錄???????????0??2009-08-02?18:45??yoyo\YOYOPlayer-源代碼\
?????文件????????3298??2008-12-27?20:15??yoyo\YOYOPlayer-源代碼\build-before-profiler.xml
?????文件????????2812??2008-12-27?20:15??yoyo\YOYOPlayer-源代碼\build-user.xml
?????文件?????????205??2008-12-27?20:15??yoyo\YOYOPlayer-源代碼\build.properties
?????文件????????3353??2008-12-27?20:15??yoyo\YOYOPlayer-源代碼\build.xml
?????目錄???????????0??2009-08-02?18:46??yoyo\YOYOPlayer-源代碼\lib\
?????文件???????46725??2008-12-27?20:14??yoyo\YOYOPlayer-源代碼\lib\commons-codec-1.3.jar
?????文件??????305001??2008-12-27?20:14??yoyo\YOYOPlayer-源代碼\lib\commons-httpclient-3.1.jar
?????文件???????52915??2008-12-27?20:14??yoyo\YOYOPlayer-源代碼\lib\commons-logging-1.1.jar
?????文件???????26202??2008-12-27?20:14??yoyo\YOYOPlayer-源代碼\lib\commons-logging-api.jar
............此處省略556個(gè)文件信息