6.11

1 files changed, 0 insertions, 368 deletions

diff --git a/zen/dst_hack.cpp b/zen/dst_hack.cpp
deleted file mode 100644
index b38f73b4..00000000
--- a/zen/dst_hack.cpp
+++ /dev/null
@@ -1,368 +0,0 @@
-#include "dst_hack.h"
-#include <bitset>
-#include "basic_math.h"
-#include "long_path_prefix.h"
-#include "utf.h"
-#include "assert_static.h"
-#include "int64.h"
-#include "file_error.h"
-#include "dll.h"
-
-using namespace zen;
-
-
-namespace
-{
-//fast ::GetVolumePathName() clone: let's hope it's not too simple (doesn't honor mount points)
-Zstring getVolumeName(const Zstring& filepath)
-{
-    //this call is expensive: ~1.5 ms!
-    //    if (!::GetVolumePathName(filepath.c_str(), //__in   LPCTSTR lpszFileName,
-    //                             fsName,           //__out  LPTSTR lpszVolumePathName,
-    //                             BUFFER_SIZE))     //__in   DWORD cchBufferLength
-    // ...
-    //    Zstring volumePath = appendSeparator(fsName);
-
-    const Zstring nameFmt = appendSeparator(removeLongPathPrefix(filepath)); //throw()
-
-    if (startsWith(nameFmt, Zstr("\\\\"))) //UNC path: "\\ComputerName\SharedFolder\"
-    {
-        size_t nameSize = nameFmt.size();
-        const size_t posFirstSlash = nameFmt.find(Zstr("\\"), 2);
-        if (posFirstSlash != Zstring::npos)
-        {
-            nameSize = posFirstSlash + 1;
-            const size_t posSecondSlash = nameFmt.find(Zstr("\\"), posFirstSlash + 1);
-            if (posSecondSlash != Zstring::npos)
-                nameSize = posSecondSlash + 1;
-        }
-        return Zstring(nameFmt.c_str(), nameSize); //include trailing backslash!
-    }
-    else //local path: "C:\Folder\"
-    {
-        const size_t pos = nameFmt.find(Zstr(":\\"));
-        if (pos == 1) //expect single letter volume
-            return Zstring(nameFmt.c_str(), 3);
-    }
-
-    return Zstring();
-}
-}
-
-
-bool dst::isFatDrive(const Zstring& filepath) //throw()
-{
-    const Zstring volumePath = getVolumeName(filepath);
-    if (volumePath.empty())
-        return false;
-
-    const DWORD bufferSize = MAX_PATH + 1;
-	wchar_t fsName[bufferSize] = {};
-
-    //suprisingly fast: ca. 0.03 ms per call!
-    if (!::GetVolumeInformation(appendSeparator(volumePath).c_str(), //__in_opt   LPCTSTR lpRootPathName,
-                                nullptr,     //__out      LPTSTR lpVolumeNameBuffer,
-                                0,           //__in       DWORD nVolumeNameSize,
-                                nullptr,     //__out_opt  LPDWORD lpVolumeSerialNumber,
-                                nullptr,     //__out_opt  LPDWORD lpMaximumComponentLength,
-                                nullptr,     //__out_opt  LPDWORD lpFileSystemFlags,
-                                fsName,      //__out      LPTSTR lpFileSystemNameBuffer,
-                                bufferSize)) //__in       DWORD nFileSystemNameSize
-    {
-        assert(false); //shouldn't happen
-        return false;
-    }
-    //DST hack seems to be working equally well for FAT and FAT32 (in particular creation time has 10^-2 s precision as advertised)
-    return fsName == Zstring(L"FAT") ||
-           fsName == Zstring(L"FAT32");
-}
-
-
-/*
-bool dst::isFatDrive(HANDLE hFile) //throw()
-{
-Requires Windows Vista!
-    //dynamically load windows API function
-    typedef BOOL (WINAPI* GetVolumeInformationByHandleWFunc)(HANDLE  hFile,
-                                                             LPWSTR  lpVolumeNameBuffer,
-                                                             DWORD   nVolumeNameSize,
-                                                             LPDWORD lpVolumeSerialNumber,
-                                                             LPDWORD lpMaximumComponentLength,
-                                                             LPDWORD lpFileSystemFlags,
-                                                             LPWSTR  lpFileSystemNameBuffer,
-                                                             DWORD   nFileSystemNameSize);
-
-    const SysDllFun<GetVolumeInformationByHandleWFunc> getVolumeInformationByHandle(L"kernel32.dll", "GetVolumeInformationByHandleW");
-    if (!getVolumeInformationByHandle)
-    {
-        assert(false);
-        return false;
-    }
-
-    const size_t BUFFER_SIZE = MAX_PATH + 1;
-    wchar_t fsName[BUFFER_SIZE];
-
-    if (!getVolumeInformationByHandle(hFile,        //__in       HANDLE hFile,
-                                      nullptr,      //__out      LPTSTR lpVolumeNameBuffer,
-                                      0,            //__in       DWORD nVolumeNameSize,
-                                      nullptr,      //__out_opt  LPDWORD lpVolumeSerialNumber,
-                                      nullptr,      //__out_opt  LPDWORD lpMaximumComponentLength,
-                                      nullptr,      //__out_opt  LPDWORD lpFileSystemFlags,
-                                      fsName,       //__out      LPTSTR lpFileSystemNameBuffer,
-                                      BUFFER_SIZE)) //__in       DWORD nFileSystemNameSize
-    {
-        assert(false); //shouldn't happen
-        return false;
-    }
-    //DST hack seems to be working equally well for FAT and FAT32 (in particular creation time has 10^-2 s precision as advertised)
-    return fsName == Zstring(L"FAT") ||
-           fsName == Zstring(L"FAT32");
-}
-*/
-
-
-namespace
-{
-//convert std::uint64_t and std::int64_t to FILETIME
-inline
-FILETIME toFiletime(std::uint64_t number)
-{
-       ULARGE_INTEGER cvt = {};
-        cvt.QuadPart = number;
-
-    const FILETIME output = { cvt.LowPart, cvt.HighPart };
-    return output;
-}
-
-inline
-FILETIME toFiletime(std::int64_t number)
-{
-	return toFiletime(static_cast<std::uint64_t>(number));
-}
-
-inline
-std::uint64_t toUInt64(const FILETIME& fileTime)
-{
-    return get64BitUInt(fileTime.dwLowDateTime, fileTime.dwHighDateTime);
-}
-
-
-inline
-std::int64_t toInt64(const FILETIME& fileTime)
-{
-    return get64BitUInt(fileTime.dwLowDateTime, fileTime.dwHighDateTime); //convert unsigned to signed in return
-}
-
-
-inline
-FILETIME utcToLocal(const FILETIME& utcTime) //throw std::runtime_error
-{
-    //treat binary local time representation (which is invariant under DST time zone shift) as logical UTC:
-    FILETIME localTime = {};
-    if (!::FileTimeToLocalFileTime(
-            &utcTime,    //__in   const FILETIME *lpFileTime,
-            &localTime)) //__out  LPFILETIME lpLocalFileTime
-    {
-        const DWORD lastError = ::GetLastError(); //copy before directly or indirectly making other system calls!
-        throw std::runtime_error(utfCvrtTo<std::string>(_("Conversion error:") + L" FILETIME -> local FILETIME: " + L"(" +
-                                                        L"High: " + numberTo<std::wstring>(utcTime.dwHighDateTime) + L" " +
-                                                        L"Low: "  + numberTo<std::wstring>(utcTime.dwLowDateTime) + L") " + L"\n\n" + formatSystemError(L"FileTimeToLocalFileTime", lastError)));
-    }
-    return localTime;
-}
-
-
-inline
-FILETIME localToUtc(const FILETIME& localTime) //throw std::runtime_error
-{
-    //treat binary local time representation (which is invariant under DST time zone shift) as logical UTC:
-    FILETIME utcTime = {};
-    if (!::LocalFileTimeToFileTime(
-            &localTime, //__in   const FILETIME *lpLocalFileTime,
-            &utcTime))  //__out  LPFILETIME lpFileTime
-    {
-        const DWORD lastError = ::GetLastError(); //copy before directly or indirectly making other system calls!
-        throw std::runtime_error(utfCvrtTo<std::string>(_("Conversion error:") + L" local FILETIME -> FILETIME: " + L"(" +
-                                                        L"High: " + numberTo<std::wstring>(localTime.dwHighDateTime) + L" " +
-                                                        L"Low: "  + numberTo<std::wstring>(localTime.dwLowDateTime) + L") " + L"\n\n" + formatSystemError(L"LocalFileTimeToFileTime", lastError)));
-    }
-    return utcTime;
-}
-
-
-//struct FILETIME {DWORD dwLowDateTime; DWORD dwHighDateTime;};
-const FILETIME FAT_MIN_TIME = { 13374976, 27846544 }; //1980 \ both are valid max/min FAT dates for 2 second precision
-const FILETIME FAT_MAX_TIME = { 14487552, 37251238 }; //2107 /
-
-//http://en.wikipedia.org/wiki/File_Allocation_Table
-const size_t PRECISION_WRITE_TIME  = 20000000; //number of 100 ns per step -> 2 s
-const size_t PRECISION_CREATE_TIME =   100000; //                          -> 1/100 s
-
-/*
-Number of bits of information in create time: ln_2((FAT_MAX_TIME - FAT_MIN_TIME) / PRECISION_CREATE_TIME) = 38.55534023
-Number of bits of information in write time: 30.91148404
-*/
-//total size available to store data:
-const size_t CREATE_TIME_INFO_BITS = 38;
-//   I. indicator that offset in II) is present
-const size_t INDICATOR_EXISTING_BITS = 1;
-//  II. local<->UTC time offset
-const size_t UTC_LOCAL_OFFSET_BITS = 7;
-// III. indicator that offset in II) corresponds to current local write time (this could be a hash of the write time)
-const size_t WRITE_TIME_HASH_BITS = CREATE_TIME_INFO_BITS - INDICATOR_EXISTING_BITS - UTC_LOCAL_OFFSET_BITS;
-
-
-template <size_t precision> inline
-FILETIME encodeRawInformation(std::uint64_t rawInfo)
-{
-    rawInfo *= precision;
-    rawInfo += toUInt64(FAT_MIN_TIME);
-
-    assert(rawInfo <= toUInt64(FAT_MAX_TIME));
-    return toFiletime(rawInfo);
-}
-
-
-template <size_t precision> inline
-std::uint64_t extractRawInformation(const FILETIME& createTime)
-{
-    assert(toUInt64(FAT_MIN_TIME) <= toUInt64(createTime));
-    assert(toUInt64(createTime) <= toUInt64(FAT_MAX_TIME));
-
-    //FAT create time ranges from 1980 - 2107 (2^7 years) with 1/100 seconds precision
-    std::uint64_t rawInfo = toUInt64(createTime);
-
-    rawInfo -= toUInt64(FAT_MIN_TIME);
-    rawInfo /= precision;        //reduce precision (FILETIME has unit 10^-7 s)
-
-    assert(toUInt64(encodeRawInformation<precision>(rawInfo)) == toUInt64(createTime)); //must be reversible
-    return rawInfo;
-}
-
-
-//convert write time to it's minimal representation (no restriction to FAT range "1980 - 2107")
-inline
-std::uint64_t extractRawWriteTime(const FILETIME& writeTime)
-{
-    std::uint64_t rawInfo = toUInt64(writeTime);
-    assert(rawInfo % PRECISION_WRITE_TIME == 0U);
-    rawInfo /= PRECISION_WRITE_TIME;        //reduce precision (FILETIME has unit 10^-7 s)
-    return rawInfo;
-}
-
-
-//files with different resolution than 2 seconds are rounded up when written to FAT
-inline
-FILETIME roundToFatWriteTime(const FILETIME& writeTime)
-{
-    std::uint64_t rawData = toUInt64(writeTime);
-
-    if (rawData % PRECISION_WRITE_TIME != 0U)
-        rawData += PRECISION_WRITE_TIME;
-
-    rawData /= PRECISION_WRITE_TIME;
-    rawData *= PRECISION_WRITE_TIME;
-    return toFiletime(rawData);
-}
-
-
-//get 7-bit value representing time shift in number of quarter-hours
-std::bitset<UTC_LOCAL_OFFSET_BITS> getUtcLocalShift()
-{
-    FILETIME utcTime = FAT_MIN_TIME;
-    utcTime.dwHighDateTime += 5000000; //some arbitrary valid time
-
-    const FILETIME localTime = utcToLocal(utcTime);
-
-    const int timeShiftSec = static_cast<int>((toInt64(localTime) - toInt64(utcTime)) / 10000000); //time shift in seconds
-
-    const int timeShiftQuarter = timeShiftSec / (60 * 15); //time shift in quarter-hours
-
-    const int absValue = numeric::abs(timeShiftQuarter); //MSVC C++0x bug: std::bitset<>(unsigned long) is ambiguous
-
-    if (std::bitset < UTC_LOCAL_OFFSET_BITS - 1 > (absValue).to_ulong() != static_cast<unsigned long>(absValue) || //time shifts that big shouldn't be possible!
-        timeShiftSec % (60 * 15) != 0) //all known time shift have at least 15 minute granularity!
-    {
-        const std::wstring errorMsg = _("Conversion error:") + L" Unexpected UTC <-> local time shift: " + L"(" + numberTo<std::wstring>(timeShiftSec) + L")";
-        throw std::runtime_error(utfCvrtTo<std::string>(errorMsg));
-    }
-
-    std::bitset<UTC_LOCAL_OFFSET_BITS> output(absValue);
-    output[UTC_LOCAL_OFFSET_BITS - 1] = timeShiftQuarter < 0; //sign bit
-    return output;
-}
-
-
-//get time-zone shift in seconds
-inline
-int convertUtcLocalShift(std::bitset<UTC_LOCAL_OFFSET_BITS> rawShift)
-{
-    const bool hasSign = rawShift[UTC_LOCAL_OFFSET_BITS - 1];
-    rawShift[UTC_LOCAL_OFFSET_BITS - 1] = false;
-
-    assert_static(UTC_LOCAL_OFFSET_BITS <= sizeof(unsigned long) * 8);
-    return hasSign ?
-           static_cast<int>(rawShift.to_ulong()) * 15 * 60 * -1 :
-           static_cast<int>(rawShift.to_ulong()) * 15 * 60;
-}
-}
-
-
-bool dst::fatHasUtcEncoded(const RawTime& rawTime) //"createTimeRaw" as retrieved by ::FindFirstFile() and ::GetFileAttributesEx(); throw std::runtime_error
-{
-    if (toUInt64(rawTime.createTimeRaw) < toUInt64(FAT_MIN_TIME) ||
-        toUInt64(FAT_MAX_TIME) < toUInt64(rawTime.createTimeRaw))
-    {
-        assert(false); //shouldn't be possible according to FAT specification
-        return false;
-    }
-
-    const std::uint64_t rawInfo = extractRawInformation<PRECISION_CREATE_TIME>(utcToLocal(rawTime.createTimeRaw));
-
-    assert_static(WRITE_TIME_HASH_BITS == 30);
-    return (extractRawWriteTime(utcToLocal(rawTime.writeTimeRaw)) & 0x3FFFFFFFU) == (rawInfo & 0x3FFFFFFFU) && //ensure write time wasn't changed externally
-           rawInfo >> (CREATE_TIME_INFO_BITS - INDICATOR_EXISTING_BITS) == 1U; //extended data available
-}
-
-
-dst::RawTime dst::fatEncodeUtcTime(const FILETIME& writeTimeRealUtc) //throw std::runtime_error
-{
-    const FILETIME fatWriteTimeUtc = roundToFatWriteTime(writeTimeRealUtc); //writeTimeRealUtc may have incompatible precision (NTFS)
-
-    //create time lets us store 40 bit of information
-
-    //indicator that utc time is encoded -> hopefully results in a date long way in the future; but even if this bit is accidentally set, we still have the hash!
-    std::uint64_t data = 1U;
-
-    const std::bitset<UTC_LOCAL_OFFSET_BITS> utcShift = getUtcLocalShift();
-    data <<= UTC_LOCAL_OFFSET_BITS;
-    data |= utcShift.to_ulong();
-
-    data <<= WRITE_TIME_HASH_BITS;
-    data |= extractRawWriteTime(utcToLocal(fatWriteTimeUtc)) & 0x3FFFFFFFU; //trim to last 30 bit of information
-    assert_static(WRITE_TIME_HASH_BITS == 30);
-
-    const FILETIME encodedData = localToUtc(encodeRawInformation<PRECISION_CREATE_TIME>(data)); //localToUtc: make sure data is physically saved as FAT local time
-    assert(toUInt64(FAT_MIN_TIME) <= toUInt64(encodedData));
-    assert(toUInt64(encodedData) <= toUInt64(FAT_MAX_TIME));
-
-    return RawTime(encodedData, fatWriteTimeUtc); //keep compatible with other applications, at least until DST shift actually occurs
-}
-
-
-FILETIME dst::fatDecodeUtcTime(const RawTime& rawTime) //return real UTC time; throw (std::runtime_error)
-{
-    if (!fatHasUtcEncoded(rawTime))
-        return rawTime.writeTimeRaw;
-
-    const std::uint64_t rawInfo = extractRawInformation<PRECISION_CREATE_TIME>(utcToLocal(rawTime.createTimeRaw));
-
-    const std::bitset<UTC_LOCAL_OFFSET_BITS> rawShift(static_cast<int>((rawInfo >> WRITE_TIME_HASH_BITS) & 0x7FU)); //static_cast<int>: a shame MSC... "unsigned long long" should be supported instead!
-    assert_static(UTC_LOCAL_OFFSET_BITS == 7);
-
-    const std::int64_t timeShiftSec = convertUtcLocalShift(rawShift);
-    const FILETIME writeTimeLocal = utcToLocal(rawTime.writeTimeRaw);
-
-    const std::int64_t realUTC = toInt64(writeTimeLocal) - timeShiftSec * 10000000;
-    return toFiletime(realUTC);
-}