7zupdate.cpp

一个7ZIP的解压源码。比较详细。里面含有四种语言的实现代码。

// UpdateMain.cpp

#include "StdAfx.h"

#include "7zUpdate.h"
#include "7zFolderInStream.h"
#include "7zEncode.h"
#include "7zHandler.h"
#include "7zOut.h"

#include "../../Compress/Copy/CopyCoder.h"
#include "../../Common/ProgressUtils.h"
#include "../../Common/LimitedStreams.h"
#include "../../Common/LimitedStreams.h"
#include "../Common/ItemNameUtils.h"

namespace NArchive {
namespace N7z {

static const wchar_t *kMatchFinderForBCJ2_LZMA = L"BT2";
static const UInt32 kDictionaryForBCJ2_LZMA = 1 << 20;
static const UInt32 kAlgorithmForBCJ2_LZMA = 1;
static const UInt32 kNumFastBytesForBCJ2_LZMA = 64;

static HRESULT WriteRange(IInStream *inStream, ISequentialOutStream *outStream, 
    UInt64 position, UInt64 size, ICompressProgressInfo *progress)
{
  RINOK(inStream->Seek(position, STREAM_SEEK_SET, 0));
  CLimitedSequentialInStream *streamSpec = new CLimitedSequentialInStream;
  CMyComPtr<CLimitedSequentialInStream> inStreamLimited(streamSpec);
  streamSpec->SetStream(inStream);
  streamSpec->Init(size);

  NCompress::CCopyCoder *copyCoderSpec = new NCompress::CCopyCoder;
  CMyComPtr<ICompressCoder> copyCoder = copyCoderSpec;
  RINOK(copyCoder->Code(inStreamLimited, outStream, NULL, NULL, progress));
  return (copyCoderSpec->TotalSize == size ? S_OK : E_FAIL);
}

static int GetReverseSlashPos(const UString &name)
{
  int slashPos = name.ReverseFind(L'/');
  #ifdef _WIN32
  int slash1Pos = name.ReverseFind(L'\\');
  slashPos = MyMax(slashPos, slash1Pos);
  #endif
  return slashPos;
}

int CUpdateItem::GetExtensionPos() const
{
  int slashPos = GetReverseSlashPos(Name);
  int dotPos = Name.ReverseFind(L'.');
  if (dotPos < 0 || (dotPos < slashPos && slashPos >= 0))
    return Name.Length();
  return dotPos + 1;
}

UString CUpdateItem::GetExtension() const
{
  return Name.Mid(GetExtensionPos());
}

#define RINOZ(x) { int __tt = (x); if (__tt != 0) return __tt; }

static int CompareBuffers(const CByteBuffer &a1, const CByteBuffer &a2)
{
  size_t c1 = a1.GetCapacity();
  size_t c2 = a2.GetCapacity();
  RINOZ(MyCompare(c1, c2));
  for (size_t i = 0; i < c1; i++)
    RINOZ(MyCompare(a1[i], a2[i]));
  return 0;
}

static int CompareCoders(const CCoderInfo &c1, const CCoderInfo &c2)
{
  RINOZ(MyCompare(c1.NumInStreams, c2.NumInStreams));
  RINOZ(MyCompare(c1.NumOutStreams, c2.NumOutStreams));
  RINOZ(MyCompare(c1.MethodID, c2.MethodID));
  return CompareBuffers(c1.Properties, c2.Properties);
}

static int CompareBindPairs(const CBindPair &b1, const CBindPair &b2)
{
  RINOZ(MyCompare(b1.InIndex, b2.InIndex));
  return MyCompare(b1.OutIndex, b2.OutIndex);
}

static int CompareFolders(const CFolder &f1, const CFolder &f2)
{
  int s1 = f1.Coders.Size();
  int s2 = f2.Coders.Size();
  RINOZ(MyCompare(s1, s2));
  int i;
  for (i = 0; i < s1; i++)
    RINOZ(CompareCoders(f1.Coders[i], f2.Coders[i]));
  s1 = f1.BindPairs.Size();
  s2 = f2.BindPairs.Size();
  RINOZ(MyCompare(s1, s2));
  for (i = 0; i < s1; i++)
    RINOZ(CompareBindPairs(f1.BindPairs[i], f2.BindPairs[i]));
  return 0;
}

static int CompareFiles(const CFileItem &f1, const CFileItem &f2)
{
  return MyStringCompareNoCase(f1.Name, f2.Name);
}

static int CompareFolderRefs(const int *p1, const int *p2, void *param)
{
  int i1 = *p1;
  int i2 = *p2;
  const CArchiveDatabaseEx &db = *(const CArchiveDatabaseEx *)param;
  RINOZ(CompareFolders(
      db.Folders[i1],
      db.Folders[i2]));
  RINOZ(MyCompare(
      db.NumUnPackStreamsVector[i1],
      db.NumUnPackStreamsVector[i2]));
  if (db.NumUnPackStreamsVector[i1] == 0)
    return 0;
  return CompareFiles(
      db.Files[db.FolderStartFileIndex[i1]],
      db.Files[db.FolderStartFileIndex[i2]]);
}

////////////////////////////////////////////////////////////

static int CompareEmptyItems(const int *p1, const int *p2, void *param)
{
  const CObjectVector<CUpdateItem> &updateItems = *(const CObjectVector<CUpdateItem> *)param;
  const CUpdateItem &u1 = updateItems[*p1];
  const CUpdateItem &u2 = updateItems[*p2];
  if (u1.IsDirectory != u2.IsDirectory)
    return (u1.IsDirectory) ? 1 : -1;
  if (u1.IsDirectory)
  {
    if (u1.IsAnti != u2.IsAnti)
      return (u1.IsAnti ? 1 : -1);
    int n = MyStringCompareNoCase(u1.Name, u2.Name);
    return -n;
  }
  if (u1.IsAnti != u2.IsAnti)
    return (u1.IsAnti ? 1 : -1);
  return MyStringCompareNoCase(u1.Name, u2.Name);
}

static const char *g_Exts = 
  " lzma 7z ace arc arj bz bz2 deb lzo lzx gz pak rpm sit tgz tbz tbz2 tgz cab ha lha lzh rar zoo" 
  " zip jar ear war msi"
  " 3gp avi mov mpeg mpg mpe wmv"
  " aac ape fla flac la mp3 m4a mp4 ofr ogg pac ra rm rka shn swa tta wv wma wav"
  " swf "
  " chm hxi hxs"
  " gif jpeg jpg jp2 png tiff  bmp ico psd psp"
  " awg ps eps cgm dxf svg vrml wmf emf ai md"
  " cad dwg pps key sxi"
  " max 3ds"
  " iso bin nrg mdf img pdi tar cpio xpi"
  " vfd vhd vud vmc vsv"
  " vmdk dsk nvram vmem vmsd vmsn vmss vmtm"
  " inl inc idl acf asa h hpp hxx c cpp cxx rc java cs pas bas vb cls ctl frm dlg def" 
  " f77 f f90 f95"
  " asm sql manifest dep "
  " mak clw csproj vcproj sln dsp dsw "
  " class "
  " bat cmd"
  " xml xsd xsl xslt hxk hxc htm html xhtml xht mht mhtml htw asp aspx css cgi jsp shtml"
  " awk sed hta js php php3 php4 php5 phptml pl pm py pyo rb sh tcl vbs"
  " text txt tex ans asc srt reg ini doc docx mcw dot rtf hlp xls xlr xlt xlw ppt pdf"
  " sxc sxd sxi sxg sxw stc sti stw stm odt ott odg otg odp otp ods ots odf"
  " abw afp cwk lwp wpd wps wpt wrf wri"
  " abf afm bdf fon mgf otf pcf pfa snf ttf"
  " dbf mdb nsf ntf wdb db fdb gdb"
  " exe dll ocx vbx sfx sys tlb awx com obj lib out o so "
  " pdb pch idb ncb opt";

int GetExtIndex(const char *ext)
{
  int extIndex = 1;
  const char *p = g_Exts;
  for (;;)
  {
    char c = *p++;
    if (c == 0)
      return extIndex;
    if (c == ' ')
      continue;
    int pos = 0;
    for (;;)
    {
      char c2 = ext[pos++];
      if (c2 == 0 && (c == 0 || c == ' '))
        return extIndex;
      if (c != c2)
        break;
      c = *p++;
    }
    extIndex++;
    for (;;)
    {
      if (c == 0)
        return extIndex;
      if (c == ' ')
        break;
      c = *p++;
    }
  }
}

struct CRefItem
{
  UInt32 Index;
  const CUpdateItem *UpdateItem;
  UInt32 ExtensionPos;
  UInt32 NamePos;
  int ExtensionIndex;
  CRefItem(UInt32 index, const CUpdateItem &updateItem, bool sortByType):
    Index(index),
    UpdateItem(&updateItem),
    ExtensionPos(0),
    NamePos(0),
    ExtensionIndex(0)
  {
    if (sortByType)
    {
      int slashPos = GetReverseSlashPos(updateItem.Name);
      NamePos = ((slashPos >= 0) ? (slashPos + 1) : 0);
      int dotPos = updateItem.Name.ReverseFind(L'.');
      if (dotPos < 0 || (dotPos < slashPos && slashPos >= 0))
        ExtensionPos = updateItem.Name.Length();
      else 
      {
        ExtensionPos = dotPos + 1;
        UString us = updateItem.Name.Mid(ExtensionPos);
        if (!us.IsEmpty())
        {
          us.MakeLower();
          int i;
          AString s;
          for (i = 0; i < us.Length(); i++)
          {
            wchar_t c = us[i];
            if (c >= 0x80)
              break;
            s += (char)c;
          }
          if (i == us.Length())
            ExtensionIndex = GetExtIndex(s);
          else
            ExtensionIndex = 0;
        }
      }
    }
  }
};

static int CompareUpdateItems(const CRefItem *p1, const CRefItem *p2, void *param)
{
  const CRefItem &a1 = *p1;
  const CRefItem &a2 = *p2;
  const CUpdateItem &u1 = *a1.UpdateItem;
  const CUpdateItem &u2 = *a2.UpdateItem;
  int n;
  if (u1.IsDirectory != u2.IsDirectory)
    return (u1.IsDirectory) ? 1 : -1;
  if (u1.IsDirectory)
  {
    if (u1.IsAnti != u2.IsAnti)
      return (u1.IsAnti ? 1 : -1);
    n = MyStringCompareNoCase(u1.Name, u2.Name);
    return -n;
  }
  bool sortByType = *(bool *)param;
  if (sortByType)
  {
    RINOZ(MyCompare(a1.ExtensionIndex, a2.ExtensionIndex))
    RINOZ(MyStringCompareNoCase(u1.Name + a1.ExtensionPos, u2.Name + a2.ExtensionPos));
    RINOZ(MyStringCompareNoCase(u1.Name + a1.NamePos, u2.Name + a2.NamePos));
    if (u1.IsLastWriteTimeDefined && u2.IsLastWriteTimeDefined)
      RINOZ(CompareFileTime(&u1.LastWriteTime, &u2.LastWriteTime));
    RINOZ(MyCompare(u1.Size, u2.Size))
  }
  return MyStringCompareNoCase(u1.Name, u2.Name);
}

struct CSolidGroup
{
  CCompressionMethodMode Method;
  CRecordVector<UInt32> Indices;
};

static wchar_t *g_ExeExts[] =
{
  L"dll",
  L"exe",
  L"ocx",
  L"sfx",
  L"sys"
};

static bool IsExeFile(const UString &ext)
{
  for (int i = 0; i < sizeof(g_ExeExts) / sizeof(g_ExeExts[0]); i++)
    if (ext.CompareNoCase(g_ExeExts[i]) == 0)
      return true;
  return false;
}

static const UInt64 k_LZMA  = 0x030101;
static const UInt64 k_BCJ   = 0x03030103;
static const UInt64 k_BCJ2  = 0x0303011B;

static bool GetMethodFull(UInt64 methodID, 
    UInt32 numInStreams, CMethodFull &methodResult)
{
  methodResult.Id = methodID;
  methodResult.NumInStreams = numInStreams;
  methodResult.NumOutStreams = 1;
  return true;
}

static bool MakeExeMethod(const CCompressionMethodMode &method, 
    bool bcj2Filter, CCompressionMethodMode &exeMethod)
{
  exeMethod = method;
  if (bcj2Filter)
  {
    CMethodFull methodFull;
    if (!GetMethodFull(k_BCJ2, 4, methodFull))
      return false;
    exeMethod.Methods.Insert(0, methodFull);
    if (!GetMethodFull(k_LZMA, 1, methodFull))
      return false;
    {
      CProp property;
      property.Id = NCoderPropID::kAlgorithm;
      property.Value = kAlgorithmForBCJ2_LZMA;
      methodFull.Properties.Add(property);
    }
    {
      CProp property;
      property.Id = NCoderPropID::kMatchFinder;
      property.Value = kMatchFinderForBCJ2_LZMA;
      methodFull.Properties.Add(property);
    }
    {
      CProp property;
      property.Id = NCoderPropID::kDictionarySize;
      property.Value = kDictionaryForBCJ2_LZMA;
      methodFull.Properties.Add(property);
    }
    {
      CProp property;
      property.Id = NCoderPropID::kNumFastBytes;
      property.Value = kNumFastBytesForBCJ2_LZMA;
      methodFull.Properties.Add(property);
    }

    exeMethod.Methods.Add(methodFull);
    exeMethod.Methods.Add(methodFull);
    CBind bind;

    bind.OutCoder = 0;
    bind.InStream = 0;

    bind.InCoder = 1;
    bind.OutStream = 0;
    exeMethod.Binds.Add(bind);

    bind.InCoder = 2;
    bind.OutStream = 1;
    exeMethod.Binds.Add(bind);

    bind.InCoder = 3;
    bind.OutStream = 2;
    exeMethod.Binds.Add(bind);
  }
  else
  {
    CMethodFull methodFull;
    if (!GetMethodFull(k_BCJ, 1, methodFull))
      return false;
    exeMethod.Methods.Insert(0, methodFull);
    CBind bind;
    bind.OutCoder = 0;
    bind.InStream = 0;
    bind.InCoder = 1;
    bind.OutStream = 0;
    exeMethod.Binds.Add(bind);
  }
  return true;
}   

static void SplitFilesToGroups(
    const CCompressionMethodMode &method, 
    bool useFilters, bool maxFilter,
    const CObjectVector<CUpdateItem> &updateItems,
    CObjectVector<CSolidGroup> &groups)
{
  if (method.Methods.Size() != 1 || method.Binds.Size() != 0)
    useFilters = false;
  groups.Clear();
  groups.Add(CSolidGroup());
  groups.Add(CSolidGroup());
  CSolidGroup &generalGroup = groups[0];
  CSolidGroup &exeGroup = groups[1];
  generalGroup.Method = method;
  int i;
  for (i = 0; i < updateItems.Size(); i++)
  {
    const CUpdateItem &updateItem = updateItems[i];
    if (!updateItem.NewData)
      continue;
    if (!updateItem.HasStream())
      continue;
    if (useFilters)
    {
      const UString name = updateItem.Name;
      int dotPos = name.ReverseFind(L'.');
      if (dotPos >= 0)
      {
        UString ext = name.Mid(dotPos + 1);
        if (IsExeFile(ext))
        {
          exeGroup.Indices.Add(i);
          continue;
        }
      }
    }
    generalGroup.Indices.Add(i);
  }
  if (exeGroup.Indices.Size() > 0)
    if (!MakeExeMethod(method, maxFilter, exeGroup.Method))
      exeGroup.Method = method;
  for (i = 0; i < groups.Size();)
    if (groups[i].Indices.Size() == 0)
      groups.Delete(i);
    else
      i++;
}

static void FromUpdateItemToFileItem(const CUpdateItem &updateItem, 
    CFileItem &file)
{
  file.Name = NItemName::MakeLegalName(updateItem.Name);
  if (updateItem.AttributesAreDefined)
    file.SetAttributes(updateItem.Attributes);
  
  if (updateItem.IsCreationTimeDefined)
    file.SetCreationTime(updateItem.CreationTime);
  if (updateItem.IsLastWriteTimeDefined)
    file.SetLastWriteTime(updateItem.LastWriteTime);
  if (updateItem.IsLastAccessTimeDefined)
    file.SetLastAccessTime(updateItem.LastAccessTime);
  
  file.UnPackSize = updateItem.Size;
  file.IsDirectory = updateItem.IsDirectory;
  file.IsAnti = updateItem.IsAnti;
  file.HasStream = updateItem.HasStream();
}

static HRESULT Update2(
    DECL_EXTERNAL_CODECS_LOC_VARS
    IInStream *inStream,
    const CArchiveDatabaseEx *database,
    const CObjectVector<CUpdateItem> &updateItems,
    ISequentialOutStream *seqOutStream,
    IArchiveUpdateCallback *updateCallback,
    const CUpdateOptions &options)
{
  UInt64 numSolidFiles = options.NumSolidFiles;
  if (numSolidFiles == 0)
    numSolidFiles = 1;
  /*
  CMyComPtr<IOutStream> outStream;
  RINOK(seqOutStream->QueryInterface(IID_IOutStream, (void **)&outStream));
  if (!outStream)
    return E_NOTIMPL;
  */

  UInt64 startBlockSize = database != 0 ? database->ArchiveInfo.StartPosition: 0;
  if (startBlockSize > 0 && !options.RemoveSfxBlock)
  {
    RINOK(WriteRange(inStream, seqOutStream, 0, startBlockSize, NULL));
  }

  CRecordVector<int> fileIndexToUpdateIndexMap;
  if (database != 0)
  {
    fileIndexToUpdateIndexMap.Reserve(database->Files.Size());
    for (int i = 0; i < database->Files.Size(); i++)
      fileIndexToUpdateIndexMap.Add(-1);
  }
  int i;
  for(i = 0; i < updateItems.Size(); i++)
  {
    int index = updateItems[i].IndexInArchive;
    if (index != -1)
      fileIndexToUpdateIndexMap[index] = i;
  }

  CRecordVector<int> folderRefs;
  if (database != 0)
  {
    for(i = 0; i < database->Folders.Size(); i++)
    {
      CNum indexInFolder = 0;
      CNum numCopyItems = 0;
      CNum numUnPackStreams = database->NumUnPackStreamsVector[i];
      for (CNum fileIndex = database->FolderStartFileIndex[i];
      indexInFolder < numUnPackStreams; fileIndex++)
      {