diff options
Diffstat (limited to 'CPP/7zip/Archive/GptHandler.cpp')
| -rw-r--r-- | CPP/7zip/Archive/GptHandler.cpp | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/CPP/7zip/Archive/GptHandler.cpp b/CPP/7zip/Archive/GptHandler.cpp new file mode 100644 index 00000000..2e0e7a57 --- /dev/null +++ b/CPP/7zip/Archive/GptHandler.cpp @@ -0,0 +1,386 @@ +// GptHandler.cpp + +#include "StdAfx.h" + +#include "../../../C/7zCrc.h" +#include "../../../C/CpuArch.h" + +#include "../../Common/ComTry.h" +#include "../../Common/IntToString.h" +#include "../../Common/MyBuffer.h" + +#include "../../Windows/PropVariantUtils.h" + +#include "../Common/RegisterArc.h" +#include "../Common/StreamUtils.h" + +#include "HandlerCont.h" + +#define Get16(p) GetUi16(p) +#define Get32(p) GetUi32(p) +#define Get64(p) GetUi64(p) + +using namespace NWindows; + +namespace NArchive { +namespace NGpt { + +#define SIGNATURE { 'E', 'F', 'I', ' ', 'P', 'A', 'R', 'T', 0, 0, 1, 0 } + +static const unsigned k_SignatureSize = 12; +static const Byte k_Signature[k_SignatureSize] = SIGNATURE; + +static const UInt32 kSectorSize = 512; + +static const CUInt32PCharPair g_PartitionFlags[] = +{ + { 0, "Sys" }, + { 1, "Ignore" }, + { 2, "Legacy" }, + { 60, "Win-Read-only" }, + { 62, "Win-Hidden" }, + { 63, "Win-Not-Automount" } +}; + +static const unsigned kNameLen = 36; + +struct CPartition +{ + Byte Type[16]; + Byte Id[16]; + UInt64 FirstLba; + UInt64 LastLba; + UInt64 Flags; + Byte Name[kNameLen * 2]; + + bool IsUnused() const + { + for (unsigned i = 0; i < 16; i++) + if (Type[i] != 0) + return false; + return true; + } + + UInt64 GetSize() const { return (LastLba - FirstLba + 1) * kSectorSize; } + UInt64 GetPos() const { return FirstLba * kSectorSize; } + UInt64 GetEnd() const { return (LastLba + 1) * kSectorSize; } + + void Parse(const Byte *p) + { + memcpy(Type, p, 16); + memcpy(Id, p + 16, 16); + FirstLba = Get64(p + 32); + LastLba = Get64(p + 40); + Flags = Get64(p + 48); + memcpy(Name, p + 56, kNameLen * 2); + } +}; + + +struct CPartType +{ + UInt32 Id; + const char *Ext; + const char *Type; +}; + +static const CPartType kPartTypes[] = +{ + // { 0x0, 0, "Unused" }, + { 0xC12A7328, 0, "EFI System" }, + { 0x024DEE41, 0, "MBR" }, + + { 0xE3C9E316, 0, "Windows MSR" }, + { 0xEBD0A0A2, 0, "Windows BDP" }, + { 0x5808C8AA, 0, "Windows LDM Metadata" }, + { 0xAF9B60A0, 0, "Windows LDM Data" }, + { 0xDE94BBA4, 0, "Windows Recovery" }, + // { 0x37AFFC90, 0, "IBM GPFS" }, + // { 0xE75CAF8F, 0, "Windows Storage Spaces" }, + + { 0x83BD6B9D, 0, "FreeBSD Boot" }, + { 0x516E7CB4, 0, "FreeBSD Data" }, + { 0x516E7CB5, 0, "FreeBSD Swap" }, + { 0x516E7CB6, "ufs", "FreeBSD UFS" }, + { 0x516E7CB8, 0, "FreeBSD Vinum" }, + { 0x516E7CB8, "zfs", "FreeBSD ZFS" }, + + { 0x48465300, "hfsx", "HFS+" }, +}; + +static int FindPartType(const Byte *guid) +{ + UInt32 val = Get32(guid); + for (unsigned i = 0; i < ARRAY_SIZE(kPartTypes); i++) + if (kPartTypes[i].Id == val) + return i; + return -1; +} + +static inline char GetHex(unsigned t) { return (char)(((t < 10) ? ('0' + t) : ('A' + (t - 10)))); } + +static void PrintHex(unsigned v, char *s) +{ + s[0] = GetHex((v >> 4) & 0xF); + s[1] = GetHex(v & 0xF); +} + +static void ConvertUInt16ToHex4Digits(UInt32 val, char *s) throw() +{ + PrintHex(val >> 8, s); + PrintHex(val & 0xFF, s + 2); +} + +static void GuidToString(const Byte *g, char *s) +{ + ConvertUInt32ToHex8Digits(Get32(g ), s); s += 8; *s++ = '-'; + ConvertUInt16ToHex4Digits(Get16(g + 4), s); s += 4; *s++ = '-'; + ConvertUInt16ToHex4Digits(Get16(g + 6), s); s += 4; *s++ = '-'; + for (unsigned i = 0; i < 8; i++) + { + if (i == 2) + *s++ = '-'; + PrintHex(g[8 + i], s); + s += 2; + } + *s = 0; +} + + +class CHandler: public CHandlerCont +{ + CRecordVector<CPartition> _items; + UInt64 _totalSize; + Byte Guid[16]; + + CByteBuffer _buffer; + + HRESULT Open2(IInStream *stream); + virtual UInt64 GetItemPos(UInt32 index) const { return _items[index].GetPos(); } + virtual UInt64 GetItemSize(UInt32 index) const { return _items[index].GetSize(); } +public: + INTERFACE_IInArchive_Cont(;) +}; + + +HRESULT CHandler::Open2(IInStream *stream) +{ + _buffer.Alloc(kSectorSize * 2); + RINOK(ReadStream_FALSE(stream, _buffer, kSectorSize * 2)); + + const Byte *buf = _buffer; + if (buf[0x1FE] != 0x55 || buf[0x1FF] != 0xAA) + return S_FALSE; + + buf += kSectorSize; + if (memcmp(buf, k_Signature, k_SignatureSize) != 0) + return S_FALSE; + { + // if (Get32(buf + 8) != 0x10000) return S_FALSE; // revision + UInt32 headerSize = Get32(buf + 12); // = 0x5C usually + if (headerSize > kSectorSize) + return S_FALSE; + UInt32 crc = Get32(buf + 0x10); + SetUi32(_buffer + kSectorSize + 0x10, 0); + if (CrcCalc(_buffer + kSectorSize, headerSize) != crc) + return S_FALSE; + } + // UInt32 reserved = Get32(buf + 0x14); + UInt64 curLba = Get64(buf + 0x18); + if (curLba != 1) + return S_FALSE; + UInt64 backupLba = Get64(buf + 0x20); + // UInt64 firstUsableLba = Get64(buf + 0x28); + // UInt64 lastUsableLba = Get64(buf + 0x30); + memcpy(Guid, buf + 0x38, 16); + UInt64 tableLba = Get64(buf + 0x48); + if (tableLba < 2) + return S_FALSE; + UInt32 numEntries = Get32(buf + 0x50); + UInt32 entrySize = Get32(buf + 0x54); // = 128 usually + UInt32 entriesCrc = Get32(buf + 0x58); + + if (entrySize < 128 + || entrySize > (1 << 12) + || numEntries > (1 << 16) + || tableLba < 2 + || tableLba >= ((UInt64)1 << (64 - 10))) + return S_FALSE; + + UInt32 tableSize = entrySize * numEntries; + UInt32 tableSizeAligned = (tableSize + kSectorSize - 1) & ~(kSectorSize - 1); + _buffer.Alloc(tableSizeAligned); + UInt64 tableOffset = tableLba * kSectorSize; + RINOK(stream->Seek(tableOffset, STREAM_SEEK_SET, NULL)); + RINOK(ReadStream_FALSE(stream, _buffer, tableSizeAligned)); + + if (CrcCalc(_buffer, tableSize) != entriesCrc) + return S_FALSE; + + _totalSize = tableOffset + tableSizeAligned; + + for (UInt32 i = 0; i < numEntries; i++) + { + CPartition item; + item.Parse(_buffer + i * entrySize); + if (item.IsUnused()) + continue; + UInt64 endPos = item.GetEnd(); + if (_totalSize < endPos) + _totalSize = endPos; + _items.Add(item); + } + + UInt64 end = (backupLba + 1) * kSectorSize; + if (_totalSize < end) + _totalSize = end; + + return S_OK; +} + +STDMETHODIMP CHandler::Open(IInStream *stream, + const UInt64 * /* maxCheckStartPosition */, + IArchiveOpenCallback * /* openArchiveCallback */) +{ + COM_TRY_BEGIN + Close(); + RINOK(Open2(stream)); + _stream = stream; + return S_OK; + COM_TRY_END +} + +STDMETHODIMP CHandler::Close() +{ + _totalSize = 0; + memset(Guid, 0, sizeof(Guid)); + _items.Clear(); + _stream.Release(); + return S_OK; +} + +static const Byte kProps[] = +{ + kpidPath, + kpidSize, + kpidFileSystem, + kpidCharacts, + kpidOffset, + kpidId +}; + +static const Byte kArcProps[] = +{ + kpidId +}; + +IMP_IInArchive_Props +IMP_IInArchive_ArcProps + +STDMETHODIMP CHandler::GetArchiveProperty(PROPID propID, PROPVARIANT *value) +{ + COM_TRY_BEGIN + NCOM::CPropVariant prop; + switch (propID) + { + case kpidMainSubfile: + { + if (_items.Size() == 1) + prop = (UInt32)0; + break; + } + case kpidPhySize: prop = _totalSize; break; + case kpidId: + { + char s[48]; + GuidToString(Guid, s); + prop = s; + break; + } + } + prop.Detach(value); + return S_OK; + COM_TRY_END +} + +STDMETHODIMP CHandler::GetNumberOfItems(UInt32 *numItems) +{ + *numItems = _items.Size(); + return S_OK; +} + +STDMETHODIMP CHandler::GetProperty(UInt32 index, PROPID propID, PROPVARIANT *value) +{ + COM_TRY_BEGIN + NCOM::CPropVariant prop; + + const CPartition &item = _items[index]; + + switch (propID) + { + case kpidPath: + { + UString s; + for (unsigned i = 0; i < kNameLen; i++) + { + wchar_t c = (wchar_t)Get16(item.Name + i * 2); + if (c == 0) + break; + s += c; + } + { + int typeIndex = FindPartType(item.Type); + s += L'.'; + const char *ext = "img"; + if (typeIndex >= 0 && kPartTypes[(unsigned)typeIndex].Ext) + ext = kPartTypes[(unsigned)typeIndex].Ext; + s.AddAscii(ext); + } + prop = s; + break; + } + + case kpidSize: + case kpidPackSize: prop = item.GetSize(); break; + case kpidOffset: prop = item.GetPos(); break; + + case kpidFileSystem: + { + char s[48]; + const char *res; + int typeIndex = FindPartType(item.Type); + if (typeIndex >= 0 && kPartTypes[(unsigned)typeIndex].Type) + res = kPartTypes[(unsigned)typeIndex].Type; + else + { + GuidToString(item.Type, s); + res = s; + } + prop = res; + break; + } + + case kpidId: + { + char s[48]; + GuidToString(item.Id, s); + prop = s; + break; + } + + case kpidCharacts: FLAGS64_TO_PROP(g_PartitionFlags, item.Flags, prop); break; + } + + prop.Detach(value); + return S_OK; + COM_TRY_END +} + +REGISTER_ARC_I( + "GPT", "gpt mbr", NULL, 0xCB, + k_Signature, + kSectorSize, + 0, + NULL) + +}} |