/**
* Thread-safe abstract compression routine. Compresses memory from uncompressed buffer and writes it to compressed
* buffer. Updates CompressedSize with size of compressed data. Compression controlled by the passed in flags.
*
* @param Flags Flags to control what method to use and optionally control memory vs speed
* @param CompressedBuffer Buffer compressed data is going to be written to
* @param CompressedSize [in/out] Size of CompressedBuffer, at exit will be size of compressed data
* @param UncompressedBuffer Buffer containing uncompressed data
* @param UncompressedSize Size of uncompressed data in bytes
* @return true if compression succeeds, false if it fails because CompressedBuffer was too small or other reasons
*/
bool FCompression::CompressMemory( ECompressionFlags Flags, void* CompressedBuffer, int32& CompressedSize, const void* UncompressedBuffer, int32 UncompressedSize )
{
double CompressorStartTime = FPlatformTime::Seconds();
// make sure a valid compression scheme was provided
check(Flags & COMPRESS_ZLIB || Flags & COMPRESS_GZIP);
bool bCompressSucceeded = false;
Flags = CheckGlobalCompressionFlags(Flags);
switch(Flags & COMPRESSION_FLAGS_TYPE_MASK)
{
case COMPRESS_ZLIB:
bCompressSucceeded = appCompressMemoryZLIB(CompressedBuffer, CompressedSize, UncompressedBuffer, UncompressedSize);
break;
case COMPRESS_GZIP:
bCompressSucceeded = appCompressMemoryGZIP(CompressedBuffer, CompressedSize, UncompressedBuffer, UncompressedSize);
break;
default:
UE_LOG(LogCompression, Warning, TEXT("appCompressMemory - This compression type not supported"));
bCompressSucceeded = false;
}
// Keep track of compression time and stats.
CompressorTime += FPlatformTime::Seconds() - CompressorStartTime;
if( bCompressSucceeded )
{
CompressorSrcBytes += UncompressedSize;
CompressorDstBytes += CompressedSize;
}
return bCompressSucceeded;
}
/**
* Thread-safe abstract compression routine. Compresses memory from uncompressed buffer and writes it to compressed
* buffer. Updates CompressedSize with size of compressed data. Compression controlled by the passed in flags.
*
* @param Flags Flags to control what method to use and optionally control memory vs speed
* @param CompressedBuffer Buffer compressed data is going to be written to
* @param CompressedSize [in/out] Size of CompressedBuffer, at exit will be size of compressed data
* @param UncompressedBuffer Buffer containing uncompressed data
* @param UncompressedSize Size of uncompressed data in bytes
* @return true if compression succeeds, false if it fails because CompressedBuffer was too small or other reasons
*/
bool FCompression::CompressMemory( ECompressionFlags Flags, void* CompressedBuffer, int32& CompressedSize, const void* UncompressedBuffer, int32 UncompressedSize )
{
double CompressorStartTime = FPlatformTime::Seconds();
// make sure a valid compression scheme was provided
check(Flags & COMPRESS_ZLIB);
bool bCompressSucceeded = false;
static bool GAlwaysBiasCompressionForSize = false;
if (FPlatformProperties::HasEditorOnlyData())
{
static bool GTestedCmdLine = false;
if (!GTestedCmdLine && FCommandLine::IsInitialized())
{
GTestedCmdLine = true;
// Override compression settings wrt size.
GAlwaysBiasCompressionForSize = FParse::Param( FCommandLine::Get(), TEXT("BIASCOMPRESSIONFORSIZE") );
}
}
// Always bias for speed if option is set.
if( GAlwaysBiasCompressionForSize )
{
int32 NewFlags = Flags;
NewFlags &= ~COMPRESS_BiasSpeed;
NewFlags |= COMPRESS_BiasMemory;
Flags = (ECompressionFlags) NewFlags;
}
switch(Flags & COMPRESSION_FLAGS_TYPE_MASK)
{
case COMPRESS_ZLIB:
bCompressSucceeded = appCompressMemoryZLIB(CompressedBuffer, CompressedSize, UncompressedBuffer, UncompressedSize);
break;
default:
UE_LOG(LogCompression, Warning, TEXT("appCompressMemory - This compression type not supported"));
bCompressSucceeded = false;
}
// Keep track of compression time and stats.
CompressorTime += FPlatformTime::Seconds() - CompressorStartTime;
if( bCompressSucceeded )
{
CompressorSrcBytes += UncompressedSize;
CompressorDstBytes += CompressedSize;
}
return bCompressSucceeded;
}
