// 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;
    }
  }

  CMyComPtr<ISequentialOutStream> outStream;
  COutFileStream *outStreamSpec = NULL;
  if (stdOutMode)
  {
    outStream = new CStdOutFileStream;
    MY_SET_BINARY_MODE(stdout);
  }
  else
  {
    if (paramIndex >= nonSwitchStrings.Size())
      IncorrectCommand();
    const UString &outputName = nonSwitchStrings[paramIndex++]; 
    outStreamSpec = new COutFileStream;
    outStream = outStreamSpec;
    if (!outStreamSpec->Create(GetSystemString(outputName), true))
    {
      fprintf(stderr, "\nError: can not open output file %s\n", 
        (const char *)GetOemString(outputName));
      return 1;
    }
  }

  if (parser[NKey::kFilter86].ThereIs)
  {
    // -f86 switch is for x86 filtered mode: BCJ + LZMA.
    if (parser[NKey::kEOS].ThereIs || stdInMode)
      throw "Can not use stdin in this mode";
    UInt64 fileSize;
    inStreamSpec->File.GetLength(fileSize);
    if (fileSize > 0xF0000000)
      throw "File is too big";
    UInt32 inSize = (UInt32)fileSize;
    Byte *inBuffer = 0;
    if (inSize != 0)
    {
      inBuffer = (Byte *)MyAlloc((size_t)inSize); 
      if (inBuffer == 0)
        throw kCantAllocate;
    }
    
    UInt32 processedSize;
    if (ReadStream(inStream, inBuffer, (UInt32)inSize, &processedSize) != S_OK)
      throw "Can not read";
    if ((UInt32)inSize != processedSize)
      throw "Read size error";

    Byte *outBuffer = 0;
    size_t outSizeProcessed;
    if (encodeMode)
    {
      // we allocate 105% of original size for output buffer
      size_t outSize = (size_t)fileSize / 20 * 21 + (1 << 16);
      if (outSize != 0)
      {
        outBuffer = (Byte *)MyAlloc((size_t)outSize); 
        if (outBuffer == 0)
          throw kCantAllocate;
      }
      if (!dictionaryIsDefined)
        dictionary = 1 << 23;
      int res = LzmaRamEncode(inBuffer, inSize, outBuffer, outSize, &outSizeProcessed, 
          dictionary, parser[NKey::kFilter86].PostCharIndex == 0 ? SZ_FILTER_YES : SZ_FILTER_AUTO);
      if (res != 0)
      {
        fprintf(stderr, "\nEncoder error = %d\n", (int)res);
        return 1;
      }
    }
    else
    {
      size_t outSize;
      if (LzmaRamGetUncompressedSize(inBuffer, inSize, &outSize) != 0)
        throw "data error";
      if (outSize != 0)
      {
        outBuffer = (Byte *)MyAlloc(outSize); 
        if (outBuffer == 0)
          throw kCantAllocate;
      }
      int res = LzmaRamDecompress(inBuffer, inSize, outBuffer, outSize, &outSizeProcessed, malloc, free);
      if (res != 0)
        throw "LzmaDecoder error";
    }
    if (WriteStream(outStream, outBuffer, (UInt32)outSizeProcessed, &processedSize) != S_OK)
      throw kWriteError;
    MyFree(outBuffer);
    MyFree(inBuffer);
    return 0;
  }


  UInt64 fileSize;
  if (encodeMode)
  {
    NCompress::NLZMA::CEncoder *encoderSpec = new NCompress::NLZMA::CEncoder;
    CMyComPtr<ICompressCoder> encoder = encoderSpec;

    if (!dictionaryIsDefined)
      dictionary = 1 << 23;

    UInt32 posStateBits = 2;
    UInt32 litContextBits = 3; // for normal files
    // UInt32 litContextBits = 0; // for 32-bit data
    UInt32 litPosBits = 0;
    // UInt32 litPosBits = 2; // for 32-bit data
    UInt32 algorithm = 1;
    UInt32 numFastBytes = 128;
    UInt32 matchFinderCycles = 16 + numFastBytes / 2;
    bool matchFinderCyclesDefined = false;

    bool eos = parser[NKey::kEOS].ThereIs || stdInMode;
 
    if(parser[NKey::kMode].ThereIs)
      if (!GetNumber(parser[NKey::kMode].PostStrings[0], algorithm))
        IncorrectCommand();

    if(parser[NKey::kFastBytes].ThereIs)
      if (!GetNumber(parser[NKey::kFastBytes].PostStrings[0], numFastBytes))
        IncorrectCommand();
    matchFinderCyclesDefined = parser[NKey::kMatchFinderCycles].ThereIs;
    if (matchFinderCyclesDefined)
      if (!GetNumber(parser[NKey::kMatchFinderCycles].PostStrings[0], matchFinderCycles))
        IncorrectCommand();
    if(parser[NKey::kLitContext].ThereIs)
      if (!GetNumber(parser[NKey::kLitContext].PostStrings[0], litContextBits))
        IncorrectCommand();
    if(parser[NKey::kLitPos].ThereIs)
      if (!GetNumber(parser[NKey::kLitPos].PostStrings[0], litPosBits))
        IncorrectCommand();
    if(parser[NKey::kPosBits].ThereIs)
      if (!GetNumber(parser[NKey::kPosBits].PostStrings[0], posStateBits))
        IncorrectCommand();

    PROPID propIDs[] = 
    {
      NCoderPropID::kDictionarySize,
      NCoderPropID::kPosStateBits,
      NCoderPropID::kLitContextBits,
      NCoderPropID::kLitPosBits,
      NCoderPropID::kAlgorithm,
      NCoderPropID::kNumFastBytes,
      NCoderPropID::kMatchFinder,
      NCoderPropID::kEndMarker,
      NCoderPropID::kNumThreads,
      NCoderPropID::kMatchFinderCycles,
    };
    const int kNumPropsMax = sizeof(propIDs) / sizeof(propIDs[0]);

    PROPVARIANT properties[kNumPropsMax];
    for (int p = 0; p < 6; p++)
      properties[p].vt = VT_UI4;

    properties[0].ulVal = (UInt32)dictionary;
    properties[1].ulVal = (UInt32)posStateBits;
    properties[2].ulVal = (UInt32)litContextBits;
    properties[3].ulVal = (UInt32)litPosBits;
    properties[4].ulVal = (UInt32)algorithm;
    properties[5].ulVal = (UInt32)numFastBytes;

    properties[6].vt = VT_BSTR;
    properties[6].bstrVal = (BSTR)(const wchar_t *)mf;

    properties[7].vt = VT_BOOL;
    properties[7].boolVal = eos ? VARIANT_TRUE : VARIANT_FALSE;

    properties[8].vt = VT_UI4;
    properties[8].ulVal = (UInt32)numThreads;

    // it must be last in property list
    properties[9].vt = VT_UI4;
    properties[9].ulVal = (UInt32)matchFinderCycles;

    int numProps = kNumPropsMax;
    if (!matchFinderCyclesDefined)
      numProps--;

    if (encoderSpec->SetCoderProperties(propIDs, properties, numProps) != S_OK)
      IncorrectCommand();
    encoderSpec->WriteCoderProperties(outStream);

    if (eos || stdInMode)
      fileSize = (UInt64)(Int64)-1;
    else
      inStreamSpec->File.GetLength(fileSize);

    for (int i = 0; i < 8; i++)
    {
      Byte b = Byte(fileSize >> (8 * i));
      if (outStream->Write(&b, 1, 0) != S_OK)
      {
        fprintf(stderr, kWriteError);
        return 1;
      }
    }
    HRESULT result = encoder->Code(inStream, outStream, 0, 0, 0);
    if (result == E_OUTOFMEMORY)
    {
      fprintf(stderr, "\nError: Can not allocate memory\n");
      return 1;
    }   
    else if (result != S_OK)
    {
      fprintf(stderr, "\nEncoder error = %X\n", (unsigned int)result);
      return 1;
    }   
  }
  else
  {
    NCompress::NLZMA::CDecoder *decoderSpec = new NCompress::NLZMA::CDecoder;
    CMyComPtr<ICompressCoder> decoder = decoderSpec;
    const UInt32 kPropertiesSize = 5;
    Byte properties[kPropertiesSize];
    UInt32 processedSize;
    if (ReadStream(inStream, properties, kPropertiesSize, &processedSize) != S_OK)
    {
      fprintf(stderr, kReadError);
      return 1;
    }
    if (processedSize != kPropertiesSize)
    {
      fprintf(stderr, kReadError);
      return 1;
    }
    if (decoderSpec->SetDecoderProperties2(properties, kPropertiesSize) != S_OK)
    {
      fprintf(stderr, "SetDecoderProperties error");
      return 1;
    }
    fileSize = 0;
    for (int i = 0; i < 8; i++)
    {
      Byte b;
      if (inStream->Read(&b, 1, &processedSize) != S_OK)
      {
        fprintf(stderr, kReadError);
        return 1;
      }
      if (processedSize != 1)
      {
        fprintf(stderr, kReadError);
        return 1;
      }
      fileSize |= ((UInt64)b) << (8 * i);
    }
    if (decoder->Code(inStream, outStream, 0, &fileSize, 0) != S_OK)
    {
      fprintf(stderr, "Decoder error");
      return 1;
    }   
  }
  if (outStreamSpec != NULL)
  {
    if (outStreamSpec->Close() != S_OK)
    {
      fprintf(stderr, "File closing error");
      return 1;
    }
  }
  return 0;
}

int main(int n, const char *args[])
{
  try { return main2(n, args); }
  catch(const char *s) 
  { 
    fprintf(stderr, "\nError: %s\n", s);
    return 1; 
  }
  catch(...) 
  { 
    fprintf(stderr, "\nError\n");
    return 1; 
  }
}