如何反編譯base64文件流
㈠ 如何在delphi中實現對文件進行base64編碼
Base64 = Class(TObject)
private
FOStream: TStream;
FIStream: TStream;
Public
{ 輸入流 }
Property IStream : TStream Read FIStream Write FIStream;
{ 輸出流 }
Property OStream : TStream Read FOStream Write FOStream;
{ 編碼 }
Function Encode : Boolean;
{ 解碼 }
Function Decode : Boolean;
End;
implementation
const
SBase64 : string = '~#%&*+-';
UnBase64: array[0..255] of byte =
(128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //0-15
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //16-31
128,128,128, 58,128, 59, 60,128, 128,128, 61, 62,128, 63,128,128, //32-47
128,128, 0, 1, 2, 3, 4, 5, 6, 7,128,128,128,128,128,128, //48-63
128, 8, 9, 10, 11, 12, 13, 14, 15,128, 16, 17, 18, 19, 20,128, //64-79
21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,128,128,128,128,128, //80-95
128, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42,128, 43, 44, 45, //96-111
46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56,128,128,128, 57,128, //112-127
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //128-143
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //128-143
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //144-159
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //160-175
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //176-191
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //192-207
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //208-223
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //224-239
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128); //240-255
{ TBase64 }
function TBase64.Decode: Boolean;
var
j, k: integer;
b: byte;
W, Tmp : Byte; //用於閱讀流的臨時變數
begin
Result := FALSE;
If (FIStream <> Nil) And (FOStream <> Nil) Then
Begin
{ 初始化}
IStream.Position := 0;
OStream.Position := 0;
b := 0;
j := 0;
K := 2;
while (IStream.Position < IStream.Size) And (IStream.Read(Tmp, 1) = 1) And (Char(Tmp) <> '.') Do
Begin
if j = 0 then
begin
b := UnBase64[Tmp];
k := 2;
end
else begin
W := UnBase64[Tmp] or ((b shl k) and $C0);
OStream.Write(W, 1);
inc(k,2);
end;
inc(j);
j := j and 3;
end;
End;
end;
function TBase64.Encode: Boolean;
var
SBuffer : Array [1..4] Of Byte;
j, k: integer;
b: byte;
Tmp : Byte; {### 用於閱讀流的臨時變數 ###}
begin
Result := FALSE;
If (FIStream <> Nil) And (FOStream <> Nil) Then
Begin
{ 初始化 }
IStream.Position := 0;
OStream.Position := 0;
b := 0;j := 2; k := 2;
while IStream.Position < IStream.Size do
begin
If IStream.Read(Tmp, 1) = 1 Then
Begin
b := b or ((Tmp and $C0) shr k);
inc(k, 2);
SBuffer[j] := Byte(SBase64[(Tmp And $3F) + 1]);
inc(j);
if j > 4 then
begin
SBuffer[1] := Byte(SBase64[b + 1]);
b := 0;
j := 2;
k := 2;
OStream.Write(SBuffer, 4);
End;
End;
End;
{ 平整數據到 SBuffer }
if j <> 2 then
begin
SBuffer[j] := Ord('.');
SBuffer[1] := Byte(SBase64[b + 1]);
OStream.Write(SBuffer, j);
end
else Begin
SBuffer[1] := Ord('.');
OStream.Write(SBuffer, 1);
end;
Result := TRUE;
end;
end;
//--------------------------------------------------------------
翻譯成C++的：
class TBase64 : public TObject{
private:
TSream FOStream;
TStream FIStream;
public:
//輸入流
__property TStream IStream = { read = FIStream , write = FIStream };
//輸出流
__property TStream OStream = { read = FOStream , write = FOStream };
//編碼
bool Encode();
//解碼
bool Decode();
};
const char * SBase64 = "~#%&*+-";
const unsigned char UnBase64[256] ={
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //0-15
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //16-31
128,128,128, 58,128, 59, 60,128, 128,128, 61, 62,128, 63,128,128, //32-47
128,128, 0, 1, 2, 3, 4, 5, 6, 7,128,128,128,128,128,128, //48-63
128, 8, 9, 10, 11, 12, 13, 14, 15,128, 16, 17, 18, 19, 20,128, //64-79
21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,128,128,128,128,128, //80-95
128, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42,128, 43, 44, 45, //96-111
46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56,128,128,128, 57,128, //112-127
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //128-143
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //128-143
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //144-159
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //160-175
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //176-191
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //192-207
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //208-223
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128, //224-239
128,128,128,128,128,128,128,128, 128,128,128,128,128,128,128,128}; //240-255
㈡ base64 decode解密碼
首先說，BASE64不是加密，他只是把數據以16進治的形勢表現出來而已，你給的代碼也沒有加密！
代碼的內容是
eval(base64_decode('...............=='))
其意思如下：
1.使用base64_decode函數反編譯被BASE64編碼的內容
2.用eval函數執行base64_decode函數的執行結果
也就是說，把base64_decode函數的參數拿出來，再用base64_decode函數執行一下，輸出其結果就可以了。
base64_decode的使用方法參考下面鏈接。
---------------------------------------------------------
return;?>之後的代碼無法解讀，貌似2進治文件的內容。
之前的代碼如下，#後面的是下一行base64加密的部分
# $IIIIIIIIIIIl='base64_decode';$IIIIIIIIIIII='gzinflate';
eval(base64_decode('RlJzs='));
$OOO0O0O00=__FILE__;
$OOO000000=urldecode('%74%68%36%73%62%65%68%71%6c%61%34%63%6f%5f%73%61%64%66%70%6e%72');
$OO00O0000=3968;
$OOO0000O0=$OOO000000{4}.$OOO000000{9}.$OOO000000{3}.$OOO000000{5};
$OOO0000O0.=$OOO000000{2}.$OOO000000{10}.$OOO000000{13}.$OOO000000{16};
$OOO0000O0.=$OOO0000O0{3}.$OOO000000{11}.$OOO000000{12}.$OOO0000O0{7}.$OOO000000{5};
$O0O0000O0='OOO0000O0';
#$OO0OO0000=$OOO000000{17}.$OOO000000{12}.$OOO000000{18}.$OOO000000{5}.$OOO000000{19};
#if(!0)$O000O0O00=$OO0OO0000($OOO0O0O00,'rb');
#$OO0OO000O=$OOO000000{17}.$OOO000000{20}.$OOO000000{5}.$OOO000000{9}.$OOO000000{16};
#$OO0OO00O0=$OOO000000{14}.$OOO000000{0}.$OOO000000{20}.$OOO000000{0}.$OOO000000{20};
#$OO0OO000O($O000O0O00,1259);
#$OO00O00O0=($OOO0000O0($OO0OO00O0($OO0OO000O($O000O0O00,728),'mQX6dsqGnkzBUVHWcYufwbOrT/e1LI+=','#nopqrstuvwxyz0123456789+/')));
#eval($OO00O00O0);
eval(($$O0O0000O0('ZXZhbCgkT08wME8wME8wKTs=')));
return;
㈢ 幫你反編譯那Pubwin2007 java版的BASE64變形源碼了，請高手幫你看差別吧
這是什麼問題？說清楚點好不好
㈣ java web開發，頁面處理Base64編碼
以使用Oracle資料庫舉例,有兩種實現方式.
一種是使用Clob類型欄位,存放Base64編碼之後的圖片,WEB應用程序在獲取到該欄位(String對象)之後,使用Base64進行反編碼,然後輸出.
還有一種是使用Blob二進制大對象欄位,直接存儲對象的位元組流.可以是任意的對象,例如圖片,視頻,文件等,然後WEB應用程序通過獲取Blob對象重新構造位元組流成為原本的對象.
但是無論使用哪一種方式,在真是業務開發中非必要的情況下是絕對不推薦的,因為數據越大,存取資料庫所發生的性能消耗就越高,應用程序的效率就會比較低下.在後續的系統移至也無法通過SQL腳本進行,只能通過Oracle DMP的方式進行.因為無論是long,Clob還是Blob,都是無法通過簡單的SQL進行插入的,推薦的做法是在資料庫VARCHAR2欄位存放該文件(圖片,視頻,文件等)的WEB容器相對路徑,WEB應用程序僅僅通過該路徑對需要訪問的對象進行鏈接.
㈤ 如何把由音頻文件轉成的base64編碼 轉迴音頻文件
網上有一些在線的轉換的工具的，將圖片或者音頻轉換為base64b編碼，可以直接放到css中使用的
㈥ 有了BASE64碼後怎麼下載
在線加密解密工具
㈦ 如何反編譯 android 中 /data/dalvik-cache/arm 下的文件
使用oatmp，即可反編譯這個文件，其實雖然/data/dalvik-cache/arm/包名@[email protected]是以.dex結尾的，但實際它是一個oat文件，並不是dex文件。oat文件是ART虛擬機下的，一個ELF文件。而oatmp的使用方法，大致是adb shell oatmp --oat-file=(路徑)