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Add unpacktool
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elasota
240
unpacktool/StuffItParser.cpp
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240
unpacktool/StuffItParser.cpp
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#include "StuffItParser.h"
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#include "IFileReader.h"
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#include "UPByteSwap.h"
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#include "PLBigEndian.h"
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#include "CRC.h"
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#include "ArchiveDescription.h"
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#include "StuffItCommon.h"
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#include "StringCommon.h"
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#include <vector>
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bool StuffItParser::Check(IFileReader &reader)
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{
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if (!reader.SeekStart(0))
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return false;
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uint8_t bytes[14];
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if (!reader.ReadExact(bytes, sizeof(bytes)))
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return false;
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if (ParseUInt32BE(bytes + 10) == 0x724c6175)
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{
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if (ParseUInt32BE(bytes) == 0x53495421)
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return true;
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// Installer archives?
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if (bytes[0] == 'S'&&bytes[1] == 'T')
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{
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if (bytes[2] == 'i' && (bytes[3] == 'n' || (bytes[3] >= '0'&&bytes[3] <= '9'))) return true;
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else if (bytes[2] >= '0'&&bytes[2] <= '9'&&bytes[3] >= '0'&&bytes[3] <= '9') return true;
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}
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}
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return false;
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}
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#define SITFH_COMPRMETHOD 0 /* xadUINT8 rsrc fork compression method */
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#define SITFH_COMPDMETHOD 1 /* xadUINT8 data fork compression method */
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#define SITFH_FNAMESIZE 2 /* xadUINT8 filename size */
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#define SITFH_FNAME 3 /* xadUINT8 31 byte filename */
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#define SITFH_FNAME_CRC 34 /* xadUINT16 crc of filename + size */
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#define SITFH_UNK 36 /* xadUINT16 unknown, always 0x0986? */
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#define SITFH_RSRCLONG 38 /* xadUINT32 unknown rsrc fork value */
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#define SITFH_DATALONG 42 /* xadUINT32 unknown data fork value */
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#define SITFH_DATACHAR 46 /* xadUINT8 unknown data (yes, data) fork value */
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#define SITFH_RSRCCHAR 47 /* xadUINT8 unknown rsrc fork value */
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#define SITFH_CHILDCOUNT 48 /* xadUINT16 number of items in dir */
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#define SITFH_PREVOFFS 50 /* xadUINT32 offset of previous entry */
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#define SITFH_NEXTOFFS 54 /* xadUINT32 offset of next entry */
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#define SITFH_PARENTOFFS 58 /* xadUINT32 offset of parent entry */
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#define SITFH_CHILDOFFS 62 /* xadINT32 offset of first child entry, -1 for file entries */
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#define SITFH_FTYPE 66 /* xadUINT32 file type */
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#define SITFH_CREATOR 70 /* xadUINT32 file creator */
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#define SITFH_FNDRFLAGS 74 /* xadUINT16 Finder flags */
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#define SITFH_CREATIONDATE 76 /* xadUINT32 creation date */
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#define SITFH_MODDATE 80 /* xadUINT32 modification date */
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#define SITFH_RSRCLENGTH 84 /* xadUINT32 decompressed rsrc length */
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#define SITFH_DATALENGTH 88 /* xadUINT32 decompressed data length */
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#define SITFH_COMPRLENGTH 92 /* xadUINT32 compressed rsrc length */
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#define SITFH_COMPDLENGTH 96 /* xadUINT32 compressed data length */
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#define SITFH_RSRCCRC 100 /* xadUINT16 crc of rsrc fork */
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#define SITFH_DATACRC 102 /* xadUINT16 crc of data fork */
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#define SITFH_RSRCPAD 104 /* xadUINT8 rsrc padding bytes for encryption */
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#define SITFH_DATAPAD 105 /* xadUINT8 data padding bytes for encryption */
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#define SITFH_DATAUNK1 106 /* xadUINT8 unknown data value, always 0? */
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#define SITFH_DATAUNK2 107 /* xadUINT8 unknown data value, always 4 for encrypted? */
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#define SITFH_RSRCUNK1 108 /* xadUINT8 unknown rsrc value, always 0? */
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#define SITFH_RSRCUNK2 109 /* xadUINT8 unknown rsrc value, always 4 for encrypted? */
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#define SITFH_HDRCRC 110 /* xadUINT16 crc of file header */
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#define SIT_FILEHDRSIZE 112
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#define StuffItEncryptedFlag 0x80 // password protected bit
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#define StuffItStartFolder 0x20 // start of folder
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#define StuffItEndFolder 0x21 // end of folder
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#define StuffItFolderContainsEncrypted 0x10 // folder contains encrypted items bit
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#define StuffItMethodMask (~StuffItEncryptedFlag)
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#define StuffItFolderMask (~(StuffItEncryptedFlag|StuffItFolderContainsEncrypted))
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struct StuffItHeader
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{
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uint8_t m_signature[4];
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BEUInt16_t m_numRootFiles;
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BEUInt32_t m_totalSize;
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uint8_t m_signature2[4];
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uint8_t m_version;
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uint8_t m_reserved;
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BEUInt32_t m_headerSize; // In version 1, this is absent, header size is always 22
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BEUInt16_t m_crc;
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};
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void ParseMacFileInfo(ArchiveItem &item, const uint8_t *header, IFileReader::FilePos_t filePos)
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{
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item.m_macProperties.m_creationDate = ParseUInt32BE(header + SITFH_CREATIONDATE);
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item.m_macProperties.m_modifiedDate = ParseUInt32BE(header + SITFH_MODDATE);
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memcpy(item.m_macProperties.m_fileCreator, header + SITFH_CREATOR, 4);
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memcpy(item.m_macProperties.m_fileType, header + SITFH_FTYPE, 4);
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item.m_macProperties.m_finderFlags = ParseUInt16BE(header + SITFH_FNDRFLAGS);
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}
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ArchiveItemList *StuffItParser::Parse(IFileReader &reader)
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{
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if (!reader.SeekStart(0))
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return nullptr;
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IFileReader::FilePos_t base = reader.GetPosition();
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StuffItHeader archiveHeader;
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if (!reader.ReadExact(&archiveHeader, sizeof(archiveHeader)))
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return nullptr;
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uint32_t headerSize = 0;
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if (archiveHeader.m_version == 0)
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return nullptr;
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else if (archiveHeader.m_version == 1)
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headerSize = sizeof(archiveHeader);
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else
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headerSize = archiveHeader.m_headerSize;
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if (headerSize < sizeof(archiveHeader))
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return nullptr;
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reader.SeekCurrent(headerSize - sizeof(archiveHeader));
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IFileReader::FilePos_t totalsize = archiveHeader.m_totalSize;
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if (static_cast<IFileReader::FilePos_t>(totalsize) > static_cast<IFileReader::FilePos_t>(reader.FileSize()))
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return nullptr;
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ArchiveItemList rootList;
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std::vector<ArchiveItemList*> folderStack;
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folderStack.push_back(&rootList);
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while (reader.GetPosition() + SIT_FILEHDRSIZE <= totalsize + base)
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{
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uint8_t header[SIT_FILEHDRSIZE];
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if (!reader.ReadExact(header, SIT_FILEHDRSIZE))
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return nullptr;
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if (ParseUInt16BE(header + SITFH_HDRCRC) == XADCalculateCRC(0, header, 110, XADCRCTable_a001))
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{
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int resourcelength = ParseUInt32BE(header + SITFH_RSRCLENGTH);
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int resourcecomplen = ParseUInt32BE(header + SITFH_COMPRLENGTH);
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int datalength = ParseUInt32BE(header + SITFH_DATALENGTH);
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int datacomplen = ParseUInt32BE(header + SITFH_COMPDLENGTH);
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int datamethod = header[SITFH_COMPDMETHOD];
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int resourcemethod = header[SITFH_COMPRMETHOD];
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int datapadding = header[SITFH_DATAPAD];
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int resourcepadding = header[SITFH_RSRCPAD];
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int namelen = header[SITFH_FNAMESIZE];
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if (namelen > 31) namelen = 31;
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const uint8_t fileNameLength = header[SITFH_FNAMESIZE];
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if (fileNameLength > SITFH_FNAME_CRC - SITFH_FNAME)
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return false;
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std::vector<uint8_t> utf8FileName;
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StringCommon::ConvertMacRomanFileName(utf8FileName, header + SITFH_FNAME, fileNameLength);
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IFileReader::FilePos_t start = reader.GetPosition();
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ArchiveItemList *stackTop = folderStack.back();
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stackTop->m_items.push_back(ArchiveItem());
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ArchiveItem &addedItem = stackTop->m_items.back();
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addedItem.m_fileNameUTF8 = std::move(utf8FileName);
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if ((datamethod&StuffItFolderMask) == StuffItStartFolder ||
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(resourcemethod&StuffItFolderMask) == StuffItStartFolder)
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{
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addedItem.m_isDirectory = true;
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ParseMacFileInfo(addedItem, header, start);
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if ((datamethod&StuffItFolderContainsEncrypted) != 0 ||
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(resourcemethod&StuffItFolderContainsEncrypted) != 0)
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{
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return nullptr;
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}
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addedItem.m_children = new ArchiveItemList();
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folderStack.push_back(addedItem.m_children);
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}
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else if ((datamethod&StuffItFolderMask) == StuffItEndFolder ||
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(resourcemethod&StuffItFolderMask) == StuffItEndFolder)
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{
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if (folderStack.size() == 1)
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return nullptr;
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stackTop->m_items.pop_back();
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folderStack.pop_back();
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}
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else
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{
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ParseMacFileInfo(addedItem, header, start);
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if (resourcelength)
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{
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if (resourcemethod & StuffItEncryptedFlag)
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return nullptr;
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addedItem.m_resourceForkDesc.m_compressedSize = resourcecomplen;
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addedItem.m_resourceForkDesc.m_uncompressedSize = resourcelength;
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addedItem.m_resourceForkDesc.m_filePosition = start;
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addedItem.m_resourceForkDesc.m_compressionMethod = StuffItCommon::ResolveCompressionMethod(resourcemethod & StuffItMethodMask);
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}
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if (datalength)
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{
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if (datamethod & StuffItEncryptedFlag)
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return nullptr;
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addedItem.m_dataForkDesc.m_compressedSize = resourcecomplen;
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addedItem.m_dataForkDesc.m_uncompressedSize = datalength;
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addedItem.m_dataForkDesc.m_filePosition = start + resourcecomplen;
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addedItem.m_dataForkDesc.m_compressionMethod = StuffItCommon::ResolveCompressionMethod(datamethod & StuffItMethodMask);
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}
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if (!reader.SeekCurrent(resourcecomplen + datacomplen))
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return nullptr;
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}
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}
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else
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return nullptr;
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}
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if (folderStack.size() != 1)
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return nullptr;
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return new ArchiveItemList(std::move(rootList));
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}
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