Nel caso sia utile, ecco una versione C ++ dello snippet Java pubblicato da Ribo:
struct decompressXML
{
// decompressXML -- Parse the 'compressed' binary form of Android XML docs
// such as for AndroidManifest.xml in .apk files
enum
{
endDocTag = 0x00100101,
startTag = 0x00100102,
endTag = 0x00100103
};
decompressXML(const BYTE* xml, int cb) {
// Compressed XML file/bytes starts with 24x bytes of data,
// 9 32 bit words in little endian order (LSB first):
// 0th word is 03 00 08 00
// 3rd word SEEMS TO BE: Offset at then of StringTable
// 4th word is: Number of strings in string table
// WARNING: Sometime I indiscriminently display or refer to word in
// little endian storage format, or in integer format (ie MSB first).
int numbStrings = LEW(xml, cb, 4*4);
// StringIndexTable starts at offset 24x, an array of 32 bit LE offsets
// of the length/string data in the StringTable.
int sitOff = 0x24; // Offset of start of StringIndexTable
// StringTable, each string is represented with a 16 bit little endian
// character count, followed by that number of 16 bit (LE) (Unicode) chars.
int stOff = sitOff + numbStrings*4; // StringTable follows StrIndexTable
// XMLTags, The XML tag tree starts after some unknown content after the
// StringTable. There is some unknown data after the StringTable, scan
// forward from this point to the flag for the start of an XML start tag.
int xmlTagOff = LEW(xml, cb, 3*4); // Start from the offset in the 3rd word.
// Scan forward until we find the bytes: 0x02011000(x00100102 in normal int)
for (int ii=xmlTagOff; ii<cb-4; ii+=4) {
if (LEW(xml, cb, ii) == startTag) {
xmlTagOff = ii; break;
}
} // end of hack, scanning for start of first start tag
// XML tags and attributes:
// Every XML start and end tag consists of 6 32 bit words:
// 0th word: 02011000 for startTag and 03011000 for endTag
// 1st word: a flag?, like 38000000
// 2nd word: Line of where this tag appeared in the original source file
// 3rd word: FFFFFFFF ??
// 4th word: StringIndex of NameSpace name, or FFFFFFFF for default NS
// 5th word: StringIndex of Element Name
// (Note: 01011000 in 0th word means end of XML document, endDocTag)
// Start tags (not end tags) contain 3 more words:
// 6th word: 14001400 meaning??
// 7th word: Number of Attributes that follow this tag(follow word 8th)
// 8th word: 00000000 meaning??
// Attributes consist of 5 words:
// 0th word: StringIndex of Attribute Name's Namespace, or FFFFFFFF
// 1st word: StringIndex of Attribute Name
// 2nd word: StringIndex of Attribute Value, or FFFFFFF if ResourceId used
// 3rd word: Flags?
// 4th word: str ind of attr value again, or ResourceId of value
// TMP, dump string table to tr for debugging
//tr.addSelect("strings", null);
//for (int ii=0; ii<numbStrings; ii++) {
// // Length of string starts at StringTable plus offset in StrIndTable
// String str = compXmlString(xml, sitOff, stOff, ii);
// tr.add(String.valueOf(ii), str);
//}
//tr.parent();
// Step through the XML tree element tags and attributes
int off = xmlTagOff;
int indent = 0;
int startTagLineNo = -2;
while (off < cb) {
int tag0 = LEW(xml, cb, off);
//int tag1 = LEW(xml, off+1*4);
int lineNo = LEW(xml, cb, off+2*4);
//int tag3 = LEW(xml, off+3*4);
int nameNsSi = LEW(xml, cb, off+4*4);
int nameSi = LEW(xml, cb, off+5*4);
if (tag0 == startTag) { // XML START TAG
int tag6 = LEW(xml, cb, off+6*4); // Expected to be 14001400
int numbAttrs = LEW(xml, cb, off+7*4); // Number of Attributes to follow
//int tag8 = LEW(xml, off+8*4); // Expected to be 00000000
off += 9*4; // Skip over 6+3 words of startTag data
std::string name = compXmlString(xml, cb, sitOff, stOff, nameSi);
//tr.addSelect(name, null);
startTagLineNo = lineNo;
// Look for the Attributes
std::string sb;
for (int ii=0; ii<numbAttrs; ii++) {
int attrNameNsSi = LEW(xml, cb, off); // AttrName Namespace Str Ind, or FFFFFFFF
int attrNameSi = LEW(xml, cb, off+1*4); // AttrName String Index
int attrValueSi = LEW(xml, cb, off+2*4); // AttrValue Str Ind, or FFFFFFFF
int attrFlags = LEW(xml, cb, off+3*4);
int attrResId = LEW(xml, cb, off+4*4); // AttrValue ResourceId or dup AttrValue StrInd
off += 5*4; // Skip over the 5 words of an attribute
std::string attrName = compXmlString(xml, cb, sitOff, stOff, attrNameSi);
std::string attrValue = attrValueSi!=-1
? compXmlString(xml, cb, sitOff, stOff, attrValueSi)
: "resourceID 0x"+toHexString(attrResId);
sb.append(" "+attrName+"=\""+attrValue+"\"");
//tr.add(attrName, attrValue);
}
prtIndent(indent, "<"+name+sb+">");
indent++;
} else if (tag0 == endTag) { // XML END TAG
indent--;
off += 6*4; // Skip over 6 words of endTag data
std::string name = compXmlString(xml, cb, sitOff, stOff, nameSi);
prtIndent(indent, "</"+name+"> (line "+toIntString(startTagLineNo)+"-"+toIntString(lineNo)+")");
//tr.parent(); // Step back up the NobTree
} else if (tag0 == endDocTag) { // END OF XML DOC TAG
break;
} else {
prt(" Unrecognized tag code '"+toHexString(tag0)
+"' at offset "+toIntString(off));
break;
}
} // end of while loop scanning tags and attributes of XML tree
prt(" end at offset "+off);
} // end of decompressXML
std::string compXmlString(const BYTE* xml, int cb, int sitOff, int stOff, int strInd) {
if (strInd < 0) return std::string("");
int strOff = stOff + LEW(xml, cb, sitOff+strInd*4);
return compXmlStringAt(xml, cb, strOff);
}
void prt(std::string str)
{
printf("%s", str.c_str());
}
void prtIndent(int indent, std::string str) {
char spaces[46];
memset(spaces, ' ', sizeof(spaces));
spaces[min(indent*2, sizeof(spaces) - 1)] = 0;
prt(spaces);
prt(str);
prt("\n");
}
// compXmlStringAt -- Return the string stored in StringTable format at
// offset strOff. This offset points to the 16 bit string length, which
// is followed by that number of 16 bit (Unicode) chars.
std::string compXmlStringAt(const BYTE* arr, int cb, int strOff) {
if (cb < strOff + 2) return std::string("");
int strLen = arr[strOff+1]<<8&0xff00 | arr[strOff]&0xff;
char* chars = new char[strLen + 1];
chars[strLen] = 0;
for (int ii=0; ii<strLen; ii++) {
if (cb < strOff + 2 + ii * 2)
{
chars[ii] = 0;
break;
}
chars[ii] = arr[strOff+2+ii*2];
}
std::string str(chars);
free(chars);
return str;
} // end of compXmlStringAt
// LEW -- Return value of a Little Endian 32 bit word from the byte array
// at offset off.
int LEW(const BYTE* arr, int cb, int off) {
return (cb > off + 3) ? ( arr[off+3]<<24&0xff000000 | arr[off+2]<<16&0xff0000
| arr[off+1]<<8&0xff00 | arr[off]&0xFF ) : 0;
} // end of LEW
std::string toHexString(DWORD attrResId)
{
char ch[20];
sprintf_s(ch, 20, "%lx", attrResId);
return std::string(ch);
}
std::string toIntString(int i)
{
char ch[20];
sprintf_s(ch, 20, "%ld", i);
return std::string(ch);
}
};
android.content.pm.PackageManager.queryXXmetodi (docs: developer.android.com/reference/android/content/pm/… ).