Initial community commit

Src/external_dependencies/openmpt-trunk/include/unrar/hash.cpp

@@ -0,0 +1,135 @@
+#include "rar.hpp"
+
+void HashValue::Init(HASH_TYPE Type)
+{
+  HashValue::Type=Type;
+
+  // Zero length data CRC32 is 0. It is important to set it when creating
+  // headers with no following data like directories or symlinks.
+  if (Type==HASH_RAR14 || Type==HASH_CRC32)
+    CRC32=0;
+  if (Type==HASH_BLAKE2)
+  {
+    // dd0e891776933f43c7d032b08a917e25741f8aa9a12c12e1cac8801500f2ca4f
+    // is BLAKE2sp hash of empty data. We init the structure to this value,
+    // so if we create a file or service header with no following data like
+    // "file copy" or "symlink", we set the checksum to proper value avoiding
+    // additional header type or size checks when extracting.
+    static byte EmptyHash[32]={
+      0xdd, 0x0e, 0x89, 0x17, 0x76, 0x93, 0x3f, 0x43,
+      0xc7, 0xd0, 0x32, 0xb0, 0x8a, 0x91, 0x7e, 0x25,
+      0x74, 0x1f, 0x8a, 0xa9, 0xa1, 0x2c, 0x12, 0xe1,
+      0xca, 0xc8, 0x80, 0x15, 0x00, 0xf2, 0xca, 0x4f
+    };
+    memcpy(Digest,EmptyHash,sizeof(Digest));
+  }
+}
+
+
+bool HashValue::operator == (const HashValue &cmp)
+{
+  if (Type==HASH_NONE || cmp.Type==HASH_NONE)
+    return true;
+  if (Type==HASH_RAR14 && cmp.Type==HASH_RAR14 || 
+      Type==HASH_CRC32 && cmp.Type==HASH_CRC32)
+    return CRC32==cmp.CRC32;
+  if (Type==HASH_BLAKE2 && cmp.Type==HASH_BLAKE2)
+    return memcmp(Digest,cmp.Digest,sizeof(Digest))==0;
+  return false;
+}
+
+
+DataHash::DataHash()
+{
+  blake2ctx=NULL;
+  HashType=HASH_NONE;
+#ifdef RAR_SMP
+  ThPool=NULL;
+  MaxThreads=0;
+#endif
+}
+
+
+DataHash::~DataHash()
+{
+#ifdef RAR_SMP
+  delete ThPool;
+#endif
+  cleandata(&CurCRC32, sizeof(CurCRC32));
+  if (blake2ctx!=NULL)
+  {
+    cleandata(blake2ctx, sizeof(blake2sp_state));
+    delete blake2ctx;
+  }
+}
+
+
+void DataHash::Init(HASH_TYPE Type,uint MaxThreads)
+{
+  if (blake2ctx==NULL)
+    blake2ctx=new blake2sp_state;
+  HashType=Type;
+  if (Type==HASH_RAR14)
+    CurCRC32=0;
+  if (Type==HASH_CRC32)
+    CurCRC32=0xffffffff; // Initial CRC32 value.
+  if (Type==HASH_BLAKE2)
+    blake2sp_init(blake2ctx);
+#ifdef RAR_SMP
+  DataHash::MaxThreads=Min(MaxThreads,MaxHashThreads);
+#endif
+}
+
+
+void DataHash::Update(const void *Data,size_t DataSize)
+{
+#ifndef SFX_MODULE
+  if (HashType==HASH_RAR14)
+    CurCRC32=Checksum14((ushort)CurCRC32,Data,DataSize);
+#endif
+  if (HashType==HASH_CRC32)
+    CurCRC32=CRC32(CurCRC32,Data,DataSize);
+
+  if (HashType==HASH_BLAKE2)
+  {
+#ifdef RAR_SMP
+    if (MaxThreads>1 && ThPool==NULL)
+      ThPool=new ThreadPool(BLAKE2_THREADS_NUMBER);
+    blake2ctx->ThPool=ThPool;
+    blake2ctx->MaxThreads=MaxThreads;
+#endif
+    blake2sp_update( blake2ctx, (byte *)Data, DataSize);
+  }
+}
+
+
+void DataHash::Result(HashValue *Result)
+{
+  Result->Type=HashType;
+  if (HashType==HASH_RAR14)
+    Result->CRC32=CurCRC32;
+  if (HashType==HASH_CRC32)
+    Result->CRC32=CurCRC32^0xffffffff;
+  if (HashType==HASH_BLAKE2)
+  {
+    // Preserve the original context, so we can continue hashing if necessary.
+    blake2sp_state res=*blake2ctx;
+    blake2sp_final(&res,Result->Digest);
+  }
+}
+
+
+uint DataHash::GetCRC32()
+{
+  return HashType==HASH_CRC32 ? CurCRC32^0xffffffff : 0;
+}
+
+
+bool DataHash::Cmp(HashValue *CmpValue,byte *Key)
+{
+  HashValue Final;
+  Result(&Final);
+  if (Key!=NULL)
+    ConvertHashToMAC(&Final,Key);
+  return Final==*CmpValue;
+}