lzmaalone.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。

// LzmaAlone.cpp

#include "StdAfx.h"

#include "../../../Common/MyWindows.h"
#include "../../../Common/MyInitGuid.h"

#include <stdio.h>

#if defined(_WIN32) || defined(OS2) || defined(MSDOS)
#include <fcntl.h>
#include <io.h>
#define MY_SET_BINARY_MODE(file) _setmode(_fileno(file), O_BINARY)
#else
#define MY_SET_BINARY_MODE(file)
#endif

#include "../../../Common/CommandLineParser.h"
#include "../../../Common/StringConvert.h"
#include "../../../Common/StringToInt.h"

#include "../../Common/FileStreams.h"
#include "../../Common/StreamUtils.h"

#include "../LZMA/LZMADecoder.h"
#include "../LZMA/LZMAEncoder.h"

#include "LzmaBenchCon.h"
#include "LzmaRam.h"

#ifdef COMPRESS_MF_MT
#include "../../../Windows/System.h"
#endif

#include "../../MyVersion.h"

extern "C"
{
#include "LzmaRamDecode.h"
}

using namespace NCommandLineParser;

#ifdef _WIN32
bool g_IsNT = false;
static inline bool IsItWindowsNT()
{
  OSVERSIONINFO versionInfo;
  versionInfo.dwOSVersionInfoSize = sizeof(versionInfo);
  if (!::GetVersionEx(&versionInfo)) 
    return false;
  return (versionInfo.dwPlatformId == VER_PLATFORM_WIN32_NT);
}
#endif

static const char *kCantAllocate = "Can not allocate memory";
static const char *kReadError = "Read error";
static const char *kWriteError = "Write error";

namespace NKey {
enum Enum
{
  kHelp1 = 0,
  kHelp2,
  kMode,
  kDictionary,
  kFastBytes,
  kMatchFinderCycles,
  kLitContext,
  kLitPos,
  kPosBits,
  kMatchFinder,
  kMultiThread,
  kEOS,
  kStdIn,
  kStdOut,
  kFilter86
};
}

static const CSwitchForm kSwitchForms[] = 
{
  { L"?",  NSwitchType::kSimple, false },
  { L"H",  NSwitchType::kSimple, false },
  { L"A", NSwitchType::kUnLimitedPostString, false, 1 },
  { L"D", NSwitchType::kUnLimitedPostString, false, 1 },
  { L"FB", NSwitchType::kUnLimitedPostString, false, 1 },
  { L"MC", NSwitchType::kUnLimitedPostString, false, 1 },
  { L"LC", NSwitchType::kUnLimitedPostString, false, 1 },
  { L"LP", NSwitchType::kUnLimitedPostString, false, 1 },
  { L"PB", NSwitchType::kUnLimitedPostString, false, 1 },
  { L"MF", NSwitchType::kUnLimitedPostString, false, 1 },
  { L"MT", NSwitchType::kUnLimitedPostString, false, 0 },
  { L"EOS", NSwitchType::kSimple, false },
  { L"SI",  NSwitchType::kSimple, false },
  { L"SO",  NSwitchType::kSimple, false },
  { L"F86",  NSwitchType::kPostChar, false, 0, 0, L"+" }
};

static const int kNumSwitches = sizeof(kSwitchForms) / sizeof(kSwitchForms[0]);

static void PrintHelp()
{
  fprintf(stderr, "\nUsage:  LZMA <e|d> inputFile outputFile [<switches>...]\n"
             "  e: encode file\n"
             "  d: decode file\n"
             "  b: Benchmark\n"
    "<Switches>\n"
    "  -a{N}:  set compression mode - [0, 1], default: 1 (max)\n"
    "  -d{N}:  set dictionary - [0,30], default: 23 (8MB)\n"
    "  -fb{N}: set number of fast bytes - [5, 273], default: 128\n"
    "  -mc{N}: set number of cycles for match finder\n"
    "  -lc{N}: set number of literal context bits - [0, 8], default: 3\n"
    "  -lp{N}: set number of literal pos bits - [0, 4], default: 0\n"
    "  -pb{N}: set number of pos bits - [0, 4], default: 2\n"
    "  -mf{MF_ID}: set Match Finder: [bt2, bt3, bt4, hc4], default: bt4\n"
    "  -mt{N}: set number of CPU threads\n"
    "  -eos:   write End Of Stream marker\n"
    "  -si:    read data from stdin\n"
    "  -so:    write data to stdout\n"
    );
}

static void PrintHelpAndExit(const char *s)
{
  fprintf(stderr, "\nError: %s\n\n", s);
  PrintHelp();
  throw -1;
}

static void IncorrectCommand()
{
  PrintHelpAndExit("Incorrect command");
}

static void WriteArgumentsToStringList(int numArguments, const char *arguments[], 
    UStringVector &strings)
{
  for(int i = 1; i < numArguments; i++)
    strings.Add(MultiByteToUnicodeString(arguments[i]));
}

static bool GetNumber(const wchar_t *s, UInt32 &value)
{
  value = 0;
  if (MyStringLen(s) == 0)
    return false;
  const wchar_t *end;
  UInt64 res = ConvertStringToUInt64(s, &end);
  if (*end != L'\0')
    return false;
  if (res > 0xFFFFFFFF)
    return false;
  value = UInt32(res);
  return true;
}

int main2(int n, const char *args[])
{
  #ifdef _WIN32
  g_IsNT = IsItWindowsNT();
  #endif

  fprintf(stderr, "\nLZMA " MY_VERSION_COPYRIGHT_DATE "\n");

  if (n == 1)
  {
    PrintHelp();
    return 0;
  }

  bool unsupportedTypes = (sizeof(Byte) != 1 || sizeof(UInt32) < 4 || sizeof(UInt64) < 4);
  if (unsupportedTypes)
  {
    fprintf(stderr, "Unsupported base types. Edit Common/Types.h and recompile");
    return 1;
  }   

  UStringVector commandStrings;
  WriteArgumentsToStringList(n, args, commandStrings);
  CParser parser(kNumSwitches);
  try
  {
    parser.ParseStrings(kSwitchForms, commandStrings);
  }
  catch(...) 
  {
    IncorrectCommand();
  }

  if(parser[NKey::kHelp1].ThereIs || parser[NKey::kHelp2].ThereIs)
  {
    PrintHelp();
    return 0;
  }
  const UStringVector &nonSwitchStrings = parser.NonSwitchStrings;

  int paramIndex = 0;
  if (paramIndex >= nonSwitchStrings.Size())
    IncorrectCommand();
  const UString &command = nonSwitchStrings[paramIndex++]; 

  bool dictionaryIsDefined = false;
  UInt32 dictionary = (UInt32)-1;
  if(parser[NKey::kDictionary].ThereIs)
  {
    UInt32 dicLog;
    if (!GetNumber(parser[NKey::kDictionary].PostStrings[0], dicLog))
      IncorrectCommand();
    dictionary = 1 << dicLog;
    dictionaryIsDefined = true;
  }
  UString mf = L"BT4";
  if (parser[NKey::kMatchFinder].ThereIs)
    mf = parser[NKey::kMatchFinder].PostStrings[0];

  UInt32 numThreads = (UInt32)-1;

  #ifdef COMPRESS_MF_MT
  if (parser[NKey::kMultiThread].ThereIs)
  {
    UInt32 numCPUs = NWindows::NSystem::GetNumberOfProcessors();
    const UString &s = parser[NKey::kMultiThread].PostStrings[0];
    if (s.IsEmpty())
      numThreads = numCPUs;
    else
      if (!GetNumber(s, numThreads))
        IncorrectCommand();
  }
  #endif

  if (command.CompareNoCase(L"b") == 0)
  {
    const UInt32 kNumDefaultItereations = 1;
    UInt32 numIterations = kNumDefaultItereations;
    {
      if (paramIndex < nonSwitchStrings.Size())
        if (!GetNumber(nonSwitchStrings[paramIndex++], numIterations))
          numIterations = kNumDefaultItereations;
    }
    return LzmaBenchCon(stderr, numIterations, numThreads, dictionary);
  }

  if (numThreads == (UInt32)-1)
    numThreads = 1;

  bool encodeMode = false;
  if (command.CompareNoCase(L"e") == 0)
    encodeMode = true;
  else if (command.CompareNoCase(L"d") == 0)
    encodeMode = false;
  else
    IncorrectCommand();

  bool stdInMode = parser[NKey::kStdIn].ThereIs;
  bool stdOutMode = parser[NKey::kStdOut].ThereIs;

  CMyComPtr<ISequentialInStream> inStream;
  CInFileStream *inStreamSpec = 0;
  if (stdInMode)
  {
    inStream = new CStdInFileStream;
    MY_SET_BINARY_MODE(stdin);
  }
  else
  {
    if (paramIndex >= nonSwitchStrings.Size())
      IncorrectCommand();
    const UString &inputName = nonSwitchStrings[paramIndex++]; 
    inStreamSpec = new CInFileStream;
    inStream = inStreamSpec;
    if (!inStreamSpec->Open(GetSystemString(inputName)))
    {
      fprintf(stderr, "\nError: can not open input file %s\n", 
          (const char *)GetOemString(inputName));
      return 1;
    }
  }