diff options
Diffstat (limited to 'src/com/github/junrar/rarfile/FileNameDecoder.java')
-rw-r--r-- | src/com/github/junrar/rarfile/FileNameDecoder.java | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/com/github/junrar/rarfile/FileNameDecoder.java b/src/com/github/junrar/rarfile/FileNameDecoder.java new file mode 100644 index 0000000..aee1179 --- /dev/null +++ b/src/com/github/junrar/rarfile/FileNameDecoder.java @@ -0,0 +1,76 @@ +/* + * + * Original author: alpha_lam + * Creation date: ? + * + * Source: $HeadURL$ + * Last changed: $LastChangedDate$ + * + * + * the unrar licence applies to all junrar source and binary distributions + * you are not allowed to use this source to re-create the RAR compression algorithm + * + * Here some html entities which can be used for escaping javadoc tags: + * "&": "&" or "&" + * "<": "<" or "<" + * ">": ">" or ">" + * "@": "@" + */ +package com.github.junrar.rarfile; + +public class FileNameDecoder { + public static int getChar(byte [] name,int pos){ + return name[pos]&0xff; + } + + public static String decode(byte [] name,int encPos){ + int decPos = 0; + int flags = 0; + int flagBits = 0; + + int low = 0; + int high = 0; + int highByte = getChar(name,encPos++); + StringBuffer buf = new StringBuffer(); + while(encPos < name.length){ + if(flagBits == 0){ + flags = getChar(name,encPos++); + flagBits = 8; + } + switch(flags >> 6){ + case 0: + buf.append((char)(getChar(name,encPos++))); + ++decPos; + break; + case 1: + buf.append((char)(getChar(name,encPos++)+(highByte<<8))); + ++decPos; + break; + case 2: + low = getChar(name,encPos); + high = getChar(name,encPos+1); + buf.append((char)((high << 8) + low)); + ++decPos; + encPos += 2; + break; + case 3: + int length = getChar(name,encPos++); + if((length&0x80)!=0){ + int correction = getChar(name,encPos++); + for(length=(length&0x7f)+2;length>0&&decPos<name.length;length--,decPos++){ + low = (getChar(name,decPos) + correction)&0xff; + buf.append((char)((highByte << 8) + low)); + } + }else{ + for(length+=2;length>0&&decPos<name.length;length--,decPos++){ + buf.append((char)(getChar(name,decPos))); + } + } + break; + } + flags = (flags << 2) & 0xff; + flagBits -= 2; + } + return buf.toString(); + } +} |