/* Xz.c - Xz
 2009-04-15 : Igor Pavlov : Public domain */
 
 #if defined(_WIN32)
 #include <WinSock2.h>
 #include <Windows.h>
 #endif
 
 #include "7zCrc.h"
 #include "CpuArch.h"
 #include "Xz.h"
 #include "XzCrc64.h"
 
 Byte XZ_SIG[XZ_SIG_SIZE] = { 0xFD, '7', 'z', 'X', 'Z', 0 };
 Byte XZ_FOOTER_SIG[XZ_FOOTER_SIG_SIZE] = { 'Y', 'Z' };
 
 unsigned Xz_WriteVarInt(Byte *buf, UInt64 v)
 {
   unsigned i = 0;
   do
   {
     buf[i++] = (Byte)((v & 0x7F) | 0x80);
     v >>= 7;
   }
   while (v != 0);
   buf[i - 1] &= 0x7F;
   return i;
 }
 
 void Xz_Construct(CXzStream *p)
 {
   p->numBlocks = p->numBlocksAllocated = 0;
   p->blocks = 0;
   p->flags = 0;
 }
 
 void Xz_Free(CXzStream *p, ISzAlloc *alloc)
 {
   alloc->Free(alloc, p->blocks);
   p->numBlocks = p->numBlocksAllocated = 0;
   p->blocks = 0;
 }
 
 unsigned XzFlags_GetCheckSize(CXzStreamFlags f)
 {
   int t = XzFlags_GetCheckType(f);
   return (t == 0) ? 0 : (4 << ((t - 1) / 3));
 }
 
 void XzCheck_Init(CXzCheck *p, int mode)
 {
   p->mode = mode;
   switch (mode)
   {
     case XZ_CHECK_CRC32: p->crc = CRC_INIT_VAL; break;
     case XZ_CHECK_CRC64: p->crc64 = CRC64_INIT_VAL; break;
     case XZ_CHECK_SHA256:
         p->sha = cl_hash_init("sha256");
         break;
   }
 }
 
 void XzCheck_Update(CXzCheck *p, const void *data, size_t size)
 {
   switch (p->mode)
   {
     case XZ_CHECK_CRC32: p->crc = CrcUpdate(p->crc, data, size); break;
     case XZ_CHECK_CRC64: p->crc64 = Crc64Update(p->crc64, data, size); break;
     case XZ_CHECK_SHA256:
         if ((p->sha))

             cl_update_hash(p->sha, (void *)data, size);

         break;
   }
 }
 
 int XzCheck_Final(CXzCheck *p, Byte *digest)
 {
   switch (p->mode)
   {
     case XZ_CHECK_CRC32:
       SetUi32(digest, CRC_GET_DIGEST(p->crc));
       break;
     case XZ_CHECK_CRC64:
     {
       int i;
       UInt64 v = CRC64_GET_DIGEST(p->crc64);
       for (i = 0; i < 8; i++, v >>= 8)
         digest[i] = (Byte)(v & 0xFF);
       break;
     }
     case XZ_CHECK_SHA256:
       if (!(p->sha))
           return 0;
 
       cl_finish_hash(p->sha, digest);
       break;
     default:
       return 0;
   }
   return 1;
 }