130 lines
2.6 KiB
C++
130 lines
2.6 KiB
C++
// <edit>
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#include "linden_common.h"
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#include "llimagemetadatareader.h"
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LLJ2cParser::LLJ2cParser(U8* data,int data_size)
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{
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if(data && data_size)
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{
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mData.resize(data_size);
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//memcpy(&(mData[0]), data, data_size);
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std::copy(data,data+data_size,mData.begin());
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}
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mIter = mData.begin();
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}
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U8 LLJ2cParser::nextChar()
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{
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U8 rtn = 0x00;
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if(mIter != mData.end())
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{
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rtn = (*mIter);
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mIter++;
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}
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return rtn;
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}
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std::vector<U8> LLJ2cParser::nextCharArray(int len)
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{
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std::vector<U8> array;
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if(len > 0)
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{
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array.resize(len);
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for(S32 i = 0; i < len; i++)
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{
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array[i] = nextChar();
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}
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}
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return array;
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}
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std::vector<U8> LLJ2cParser::GetNextComment()
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{
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std::vector<U8> content;
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while (mIter != mData.end())
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{
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U8 marker = nextChar();
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if (marker == 0xff)
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{
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U8 marker_type = nextChar();
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if (marker_type == 0x4f)
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{
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continue;
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}
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if (marker_type == 0x90)
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{
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//llinfos << "FOUND 0x90" << llendl;
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break; //return empty vector
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}
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if (marker_type == 0x64)
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{
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//llinfos << "FOUND 0x64 COMMENT SECTION" << llendl;
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S32 len = ((S32)nextChar())*256 + (S32)nextChar();
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if (len > 3) content = nextCharArray(len - 2);
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return content;
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}
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}
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}
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content.clear(); //return empty vector by clear anything there
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return content;
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}
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//static
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std::string LLImageMetaDataReader::ExtractEncodedComment(U8* data,int data_size)
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{
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LLJ2cParser* parser = new LLJ2cParser(data,data_size);
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while(1)
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{
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std::vector<U8> comment = parser->GetNextComment();
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if (comment.empty()) break; //exit loop
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if (comment[1] == 0x00 && comment.size() == 130)
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{
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//llinfos << "FOUND PAYLOAD" << llendl;
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std::vector<U8> payload(128);
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S32 i;
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//memcpy(&(payload[0]), &(comment[2]), 128);
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std::copy(comment.begin()+2,comment.end(),payload.begin());
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if (payload[2] == payload[127])
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{
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// emkdu.dll
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for (i = 4; i < 128; i += 4)
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{
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payload[i] ^= payload[3];
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payload[i + 1] ^= payload[1];
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payload[i + 2] ^= payload[0];
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payload[i + 3] ^= payload[2];
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}
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}
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else if (payload[3] == payload[127])
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{
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// emkdu.dll or onyxkdu.dll
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for (i = 4; i < 128; i += 4)
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{
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payload[i] ^= payload[2];
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payload[i + 1] ^= payload[0];
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payload[i + 2] ^= payload[1];
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payload[i + 3] ^= payload[3];
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}
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}
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else
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{
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break;//exit loop
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}
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for (i = 4; i < 128; ++i)
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{
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if (payload[i] == 0) break;
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}
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if(i < 4) break;
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std::string result(payload.begin()+4,payload.begin()+i);
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//llinfos << "FOUND COMMENT: " << result << llendl;
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delete parser;
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return result;
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}
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}
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//end of loop
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delete parser;
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return "";
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}
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// </edit>
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