/* 7zMain.c - Test application for 7z Decoder
2010-10-28 : Igor Pavlov : Public domain */

#include <stdio.h>
#include <string.h>

#include "7z/7z.h"
#include "7z/7zAlloc.h"
#include "7z/7zCrc.h"
#include "7z/7zFile.h"
#include "7z/7zVersion.h"

/*
#ifndef UNICODE
#define UNICODE
#endif
*/
#ifndef USE_WINDOWS_FILE
/* for mkdir */
#ifdef _WIN32
#include <direct.h>
#else
#include <sys/stat.h>
#include <errno.h>
#endif
#endif

static ISzAlloc g_Alloc = { SzAlloc, SzFree };

static int Buf_EnsureSize(CBuf *dest, size_t size)
{
  if (dest->size >= size)
    return 1;
  Buf_Free(dest, &g_Alloc);
  return Buf_Create(dest, size, &g_Alloc);
}

#ifndef _WIN32

static Byte kUtf8Limits[5] = { 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };

static Bool Utf16_To_Utf8(Byte *dest, size_t *destLen, const UInt16 *src, size_t srcLen)
{
  size_t destPos = 0, srcPos = 0;
  for (;;)
  {
    unsigned numAdds;
    UInt32 value;
    if (srcPos == srcLen)
    {
      *destLen = destPos;
      return True;
    }
    value = src[srcPos++];
    if (value < 0x80)
    {
      if (dest)
        dest[destPos] = (char)value;
      destPos++;
      continue;
    }
    if (value >= 0xD800 && value < 0xE000)
    {
      UInt32 c2;
      if (value >= 0xDC00 || srcPos == srcLen)
        break;
      c2 = src[srcPos++];
      if (c2 < 0xDC00 || c2 >= 0xE000)
        break;
      value = (((value - 0xD800) << 10) | (c2 - 0xDC00)) + 0x10000;
    }
    for (numAdds = 1; numAdds < 5; numAdds++)
      if (value < (((UInt32)1) << (numAdds * 5 + 6)))
        break;
    if (dest)
      dest[destPos] = (char)(kUtf8Limits[numAdds - 1] + (value >> (6 * numAdds)));
    destPos++;
    do
    {
      numAdds--;
      if (dest)
        dest[destPos] = (char)(0x80 + ((value >> (6 * numAdds)) & 0x3F));
      destPos++;
    }
    while (numAdds != 0);
  }
  *destLen = destPos;
  return False;
}

static SRes Utf16_To_Utf8Buf(CBuf *dest, const UInt16 *src, size_t srcLen)
{
  size_t destLen = 0;
  Bool res;
  Utf16_To_Utf8(NULL, &destLen, src, srcLen);
  destLen += 1;
  if (!Buf_EnsureSize(dest, destLen))
    return SZ_ERROR_MEM;
  res = Utf16_To_Utf8(dest->data, &destLen, src, srcLen);
  dest->data[destLen] = 0;
  return res ? SZ_OK : SZ_ERROR_FAIL;
}
#endif

static SRes Utf16_To_Char(CBuf *buf, const UInt16 *s, int fileMode)
{
  int len = 0;
  for (len = 0; s[len] != '\0'; len++);

  #ifdef _WIN32
  {
    int size = len * 3 + 100;
    if (!Buf_EnsureSize(buf, size))
      return SZ_ERROR_MEM;
    {
      char defaultChar = '_';
      BOOL defUsed;
      int numChars = WideCharToMultiByte(fileMode ?
          (
          #ifdef UNDER_CE
          CP_ACP
          #else
          AreFileApisANSI() ? CP_ACP : CP_OEMCP
          #endif
          ) : CP_OEMCP,
          0, s, len, (char *)buf->data, size, &defaultChar, &defUsed);
      if (numChars == 0 || numChars >= size)
        return SZ_ERROR_FAIL;
      buf->data[numChars] = 0;
      return SZ_OK;
    }
  }
  #else
  fileMode = fileMode;
  return Utf16_To_Utf8Buf(buf, s, len);
  #endif
}

static WRes MyCreateDir(const UInt16 *name)
{
  #ifdef USE_WINDOWS_FILE
  
  return CreateDirectoryW(name, NULL) ? 0 : GetLastError();
  
  #else

  CBuf buf;
  WRes res;
  Buf_Init(&buf);
  RINOK(Utf16_To_Char(&buf, name, 1));

  res =
  #ifdef _WIN32
  _mkdir((const char *)buf.data)
  #else
  mkdir((const char *)buf.data, 0777)
  #endif
  == 0 ? 0 : errno;
  Buf_Free(&buf, &g_Alloc);
  return res;
  
  #endif
}

static WRes OutFile_OpenUtf16(CSzFile *p, const UInt16 *name)
{
  #ifdef USE_WINDOWS_FILE
  return OutFile_OpenW(p, name);
  #else
  CBuf buf;
  WRes res;
  Buf_Init(&buf);
  RINOK(Utf16_To_Char(&buf, name, 1));
  res = OutFile_Open(p, (const char *)buf.data);
  Buf_Free(&buf, &g_Alloc);
  return res;
  #endif
}

static SRes PrintString(const UInt16 *s)
{
  CBuf buf;
  SRes res;
  Buf_Init(&buf);
  res = Utf16_To_Char(&buf, s, 0);
  if (res == SZ_OK)
    fputs((const char *)buf.data, stdout);
  Buf_Free(&buf, &g_Alloc);
  return res;
}

static void UInt64ToStr(UInt64 value, char *s)
{
  char temp[32];
  int pos = 0;
  do
  {
    temp[pos++] = (char)('0' + (unsigned)(value % 10));
    value /= 10;
  }
  while (value != 0);
  do
    *s++ = temp[--pos];
  while (pos);
  *s = '\0';
}

static char *UIntToStr(char *s, unsigned value, int numDigits)
{
  char temp[16];
  int pos = 0;
  do
    temp[pos++] = (char)('0' + (value % 10));
  while (value /= 10);
  for (numDigits -= pos; numDigits > 0; numDigits--)
    *s++ = '0';
  do
    *s++ = temp[--pos];
  while (pos);
  *s = '\0';
  return s;
}

#define PERIOD_4 (4 * 365 + 1)
#define PERIOD_100 (PERIOD_4 * 25 - 1)
#define PERIOD_400 (PERIOD_100 * 4 + 1)

static void ConvertFileTimeToString(const CNtfsFileTime *ft, char *s)
{
  unsigned year, mon, day, hour, min, sec;
  UInt64 v64 = (ft->Low | ((UInt64)ft->High << 32)) / 10000000;
  Byte ms[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  unsigned t;
  UInt32 v;
  sec = (unsigned)(v64 % 60); v64 /= 60;
  min = (unsigned)(v64 % 60); v64 /= 60;
  hour = (unsigned)(v64 % 24); v64 /= 24;

  v = (UInt32)v64;

  year = (unsigned)(1601 + v / PERIOD_400 * 400);
  v %= PERIOD_400;

  t = v / PERIOD_100; if (t ==  4) t =  3; year += t * 100; v -= t * PERIOD_100;
  t = v / PERIOD_4;   if (t == 25) t = 24; year += t * 4;   v -= t * PERIOD_4;
  t = v / 365;        if (t ==  4) t =  3; year += t;       v -= t * 365;

  if (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))
    ms[1] = 29;
  for (mon = 1; mon <= 12; mon++)
  {
    unsigned s = ms[mon - 1];
    if (v < s)
      break;
    v -= s;
  }
  day = (unsigned)v + 1;
  s = UIntToStr(s, year, 4); *s++ = '-';
  s = UIntToStr(s, mon, 2);  *s++ = '-';
  s = UIntToStr(s, day, 2);  *s++ = ' ';
  s = UIntToStr(s, hour, 2); *s++ = ':';
  s = UIntToStr(s, min, 2);  *s++ = ':';
  s = UIntToStr(s, sec, 2);
}

void PrintError(char *sz)
{
  printf("\nERROR: %s\n", sz);
}

#ifdef USE_WINDOWS_FILE
#define kEmptyAttribChar '.'
static void GetAttribString(UInt32 wa, Bool isDir, char *s)
{
  s[0] = (char)(((wa & FILE_ATTRIBUTE_DIRECTORY) != 0 || isDir) ? 'D' : kEmptyAttribChar);
  s[1] = (char)(((wa & FILE_ATTRIBUTE_READONLY) != 0) ? 'R': kEmptyAttribChar);
  s[2] = (char)(((wa & FILE_ATTRIBUTE_HIDDEN) != 0) ? 'H': kEmptyAttribChar);
  s[3] = (char)(((wa & FILE_ATTRIBUTE_SYSTEM) != 0) ? 'S': kEmptyAttribChar);
  s[4] = (char)(((wa & FILE_ATTRIBUTE_ARCHIVE) != 0) ? 'A': kEmptyAttribChar);
  s[5] = '\0';
}
#else
static void GetAttribString(UInt32, Bool, char *s)
{
  s[0] = '\0';
}
#endif

int SevenZipUnCompress( char *fname, unsigned char ** ppBuf,size_t * lpdwSize)
{
  CFileInStream archiveStream;
  CLookToRead lookStream;
  CSzArEx db;
  SRes res;
  ISzAlloc allocImp;
  ISzAlloc allocTempImp;
  UInt16 *temp = NULL;
  size_t tempSize = 0;

  int bHasRomFile = 0;
  int bExtractRomOK = 0;
  //枚举文件，找到NES或者UNF文件，找不到直接返回
  allocImp.Alloc = SzAlloc;
  allocImp.Free = SzFree;

  allocTempImp.Alloc = SzAllocTemp;
  allocTempImp.Free = SzFreeTemp;

  if (InFile_Open(&archiveStream.file, fname))
  {
    return FALSE;
  }

  FileInStream_CreateVTable(&archiveStream);
  LookToRead_CreateVTable(&lookStream, False);
  
  lookStream.realStream = &archiveStream.s;
  LookToRead_Init(&lookStream);

  CrcGenerateTable();

  SzArEx_Init(&db);
  res = SzArEx_Open(&db, &lookStream.s, &allocImp, &allocTempImp);
  if (res == SZ_OK)
  {
      UInt32 i;

      UInt32 blockIndex = 0xFFFFFFFF; /* it can have any value before first call (if outBuffer = 0) */
      Byte *outBuffer = 0; /* it must be 0 before first call for each new archive. */

      for (i = 0; i < db.db.NumFiles; i++)
	  {
		  size_t offset = 0;
		  size_t outSizeProcessed = 0;
		  const CSzFileItem *f = db.db.Files + i;
		  size_t len;

		  len = SzArEx_GetFileNameUtf16(&db, i, NULL);

		  if (len > tempSize)
		  {
			  SzFree(NULL, temp);
			  tempSize = len;
			  temp = (UInt16 *)SzAlloc(NULL, tempSize * sizeof(temp[0]));
			  if (temp == 0)
			  {
				  res = SZ_ERROR_MEM;
				  break;
			  }
		  }
		  
		  SzArEx_GetFileNameUtf16(&db, i, temp);
		  //获取文件信息
		  {
			  char attr[8];
			  GetAttribString(f->AttribDefined ? f->Attrib : 0, f->IsDir, attr);// f->IsDir 文件是否是目录
			  
			  //UInt64ToStr(f->Size, s);//f->Size 文件大小
			  if(f->IsDir!=1)
			  {
				  //检测扩展名
				  if(len>5)
				  {
					  //"*.nes",
					  //"*.unf",
					  //"*.fds",
					  //"*.nsf",
					  if(wcsicmp(L".nes",&temp[len-5])==0)
					  {
						  bHasRomFile =1;
					  }
					  else if(wcsicmp(L".unf",&temp[len-5])==0)
					  {
						  bHasRomFile =1;
					  }
					  else if(wcsicmp(L".fds",&temp[len-5])==0)
					  {
						  bHasRomFile =1;
					  }
					  else if(wcsicmp(L".nsf",&temp[len-5])==0)
					  {
						  bHasRomFile =1;
					  }
				  }
				  //if( (f->Size>16000)&&(f->Size<10000000) )
				  //bHasRomFile =1;
			  }		  

			  if(bHasRomFile==0)
				  continue;
		  }

		  if (bHasRomFile)
		  {
			  res = SzArEx_Extract(&db, &lookStream.s, i,&blockIndex, ppBuf, lpdwSize,&offset, &outSizeProcessed,&allocImp, &allocTempImp);
			  if (res != SZ_OK)
				  continue;
			  else
			  {
				  bExtractRomOK = 1;
				  if(offset!=0)
				  {//重组
					  void *pRom = malloc(f->Size);
					  memcpy(pRom,*ppBuf+offset,f->Size);
					  *lpdwSize = f->Size;
					  free(*ppBuf);
					  *ppBuf = pRom;
				  }
			  }
		  }
		  if(bExtractRomOK)
			  break;
	  }//结束文件枚举循环	  
	  IAlloc_Free(&allocImp, outBuffer);
  }
  SzArEx_Free(&db, &allocImp);
  SzFree(NULL, temp);

  File_Close(&archiveStream.file);
  /*if (res == SZ_OK)
  {
    printf("\nEverything is Ok\n");
    return 0;
  }*/ 
  return bExtractRomOK;
}

/*

int MY_CDECL main(int c, char *v[])
{
	unsigned char *pBuf = 0;
	size_t fileLen;
	int i = SevenZipUnCompress(v[1],&pBuf,&fileLen);
	free(pBuf); pBuf = 0;
	printf("%d",i);
}
*/