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https://github.com/WerWolv/ImHex-Patterns.git
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patterns/7z: Added CompressData length and other improvements (#134)
* Update 7z.hexpat - v1.01 v1.01 --Minor changes. --CompressData lenght added --Output optimization * Update 7z.hexpat v1.02 -Minor Changes -Added Bzip2 verification
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jfsbrito
GitHub
@@ -1,98 +1,99 @@
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#include <std/io.pat>
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#include <std/mem.pat>
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#include <std/math.pat>
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#include <std/io.pat>
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#include <std/mem.pat>
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#include <std/math.pat>
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enum Type:u8{
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startPosition = 0x00,
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sizeStartHeader = 0x20,
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};
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enum TypeB:u48{
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sevenZipSignature = 0x1C27AFBC7A37,
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};
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enum Type:u8{
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startPosition = 0x00, // Start position
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sizeStartHeader = 0x20, // Size of start Header
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};
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struct StartHeader {
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enum TypeB:u48{
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sevenZipSignature = 0x1C27AFBC7A37, // Defining 7z signature
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};
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struct StartHeader {
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// File signature
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u48 signature [[color("FF0000")] ];
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// Version format
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u16 formatVersion [[color("00FF00")]];
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// CRC start header
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u32 crcOfTheFollowing20Bytes [[color("0000FF")]];
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// Relative offset of End Header
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u64 relativeOffsetEndHeader [[color("FFFF00")]];
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// Length of End Header
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u64 theLengthOfEndHeader [[color("00FFFF")]];
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// CRC of End Ender
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u32 crcOftheEndHeader [[color("FF00FF")]];
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// File size calculation
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u64 fileSize = relativeOffsetEndHeader + theLengthOfEndHeader + Type::sizeStartHeader;
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// Absolute offset calculation End Header
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u64 startEndHeader = relativeOffsetEndHeader + Type::sizeStartHeader;
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};
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StartHeader startheader @ Type::startPosition;
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struct CompressedData {
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// Start of compressed data
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u8 startOfCompressedData[4] [[color("C0C0C0")]];
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};
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CompressedData compresseddata @ Type::sizeStartHeader;
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u48 signature [[color("FF0000")] ];
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u16 formatVersion [[color("00FF00")]];
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u32 crcOfTheFollowing20Bytes [[color("0000FF")]];
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u64 relativeOffsetEndHeader [[color("FFFF00")]];
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u64 theLengthOfEndHeader [[color("00FFFF")]];
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u32 crcOftheEndHeader [[color("FF00FF")]];
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u64 fileSize = relativeOffsetEndHeader + theLengthOfEndHeader + Type::sizeStartHeader;
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u64 startEndHeader = relativeOffsetEndHeader + Type::sizeStartHeader;
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};
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struct EndHeader {
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// Set padding to place End Header in right position
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padding[startheader.relativeOffsetEndHeader];
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// Mark link to meta block
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u8 linkToMetaBlock [[color("FF0000")]];
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// Mark all End Header
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char fullEndHeader[startheader.theLengthOfEndHeader] [[color("63954A")]];
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// Detect LZMA signature
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u64 lzmaSignaturePosition = std::mem::find_sequence_in_range(0, addressof(fullEndHeader), addressof(fullEndHeader) + sizeof(fullEndHeader), 0x23, 0x03, 0x01, 0x01, 0x05, 0x5D);
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// Mark positions if LZMA signature was detected
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if(lzmaSignaturePosition != 0xFFFFFFFFFFFFFFFF){
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u48 lzmaSignature @ lzmaSignaturePosition [[color("0000FF")]];
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}
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};
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EndHeader endheader @ Type::sizeStartHeader;
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// Check 7z type
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if(startheader.signature == TypeB::sevenZipSignature){
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std::print("It is a 7z File Type");
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}else{
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std::print("The file is not 7z type");
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}
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StartHeader startheader @ Type::startPosition;
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std::print("Format Version {} ",startheader.formatVersion);
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struct CompressedData {
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u8 startOfCompressedData[4] [[color("C0C0C0")]];
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};
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// Version verification
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if(startheader.formatVersion == 0x0400){
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std::print("Major Version 0x00 || 0 - Minor Version 0x04 || 4");
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}
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CompressedData compresseddata @ Type::sizeStartHeader;
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struct EndHeader {
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padding[startheader.relativeOffsetEndHeader];
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u8 linkToMetaBlock [[color("FF0000")]];
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char fullEndHeader[startheader.theLengthOfEndHeader] [[color("63954A")]];
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u64 lzmaSignaturePosition = std::mem::find_sequence_in_range(0, addressof(fullEndHeader), addressof(fullEndHeader) + sizeof(fullEndHeader), 0x23, 0x03, 0x01, 0x01, 0x05, 0x5D);
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if(lzmaSignaturePosition != 0xFFFFFFFFFFFFFFFF){
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u48 lzmaSignature @ lzmaSignaturePosition [[color("0000FF")]];
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}
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};
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EndHeader endheader @ Type::sizeStartHeader;
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if(startheader.signature == TypeB::sevenZipSignature){
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std::print("It is a 7z File Type"); std::print("\n");
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// Verification of the compressed method is LZMA, Bzip2 or LZMA2
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if(compresseddata.startOfCompressedData[0] == Type::startPosition){
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std::print("Compressed Method LZMA");
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}else if(compresseddata.startOfCompressedData[0] == 0x42){
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std::print("Compressed Method Bzip2");
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}else{
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std::print("Compressed Method LZMA2");
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}
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std::print("Format Version {} ",startheader.formatVersion);
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if(startheader.formatVersion == 0x0400){
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std::print("CRC Start Header 0x{:X}",startheader.crcOfTheFollowing20Bytes);
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std::print("Major Version 0x00 Minor Version 0x04"); std::print("\n");
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}
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std::print("CRC End Header 0x{:X} ", startheader.crcOftheEndHeader);
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std::print("CRC of the following 20 bytes 0x{:X}",startheader.crcOfTheFollowing20Bytes); std::print("\n");
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std::print("CompressedData length 0x{:X} || {} bytes ",startheader.relativeOffsetEndHeader, startheader.relativeOffsetEndHeader);
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std::print("Relative offset of End Header {} ",startheader.relativeOffsetEndHeader); std::print("\n");
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std::print("Relative Offset of End Header 0x{:X} || {} bytes",startheader.relativeOffsetEndHeader, startheader.relativeOffsetEndHeader);
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std::print("The length of End Header {} ",startheader.theLengthOfEndHeader); std::print("\n");
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std::print("Offset to start End Header 0x{:X} || {} bytes",startheader.startEndHeader,startheader.startEndHeader);
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std::print("CRC of the End Header 0x{:X} ", startheader.crcOftheEndHeader); std::print("\n");
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std::print("End Header length 0x{:X} || {} bytes",startheader.theLengthOfEndHeader,startheader.theLengthOfEndHeader);
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std::print("Offset to start End Header {}",startheader.startEndHeader); std::print("\n");
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std::print("File size {} bytes",startheader.fileSize); std::print("\n");
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if(compresseddata.startOfCompressedData[0] == Type::startPosition){
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std::print("Compressed Method LZMA"); std::print("\n");
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}else{
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std::print("Compressed Method LZMA2"); std::print("\n");
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}
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std::print("File size 0x{:X} || {} bytes",startheader.fileSize, startheader.fileSize);
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