diff --git a/indra/llimagej2coj/llimagej2coj2.cpp b/indra/llimagej2coj/llimagej2coj2.cpp
index 437ea88c94..c3f7f3d9bc 100644
--- a/indra/llimagej2coj/llimagej2coj2.cpp
+++ b/indra/llimagej2coj/llimagej2coj2.cpp
@@ -33,6 +33,7 @@
 #include "lltimer.h"
 //#include "llmemory.h"
 
+#define OPENJPEG_VERSION "2.1" // This actually needs to be in openjpeg.h
 
 struct ndUserdata
 {
@@ -126,23 +127,16 @@ OPJ_BOOL nd_opj_stream_seek_fn(OPJ_OFF_T p_nb_bytes, void * p_user_data)
 	return OPJ_TRUE;
 }
 
-const char* fallbackEngineInfoLLImageJ2CImpl()
-{
-	static std::string version_string =
-		std::string("OpenJPEG: 2.1, Runtime: ")
-		+ opj_version();
-	return version_string.c_str();
-}
-
+// Factory function: see declaration in llimagej2c.cpp
 LLImageJ2CImpl* fallbackCreateLLImageJ2CImpl()
 {
 	return new LLImageJ2COJ();
 }
 
-void fallbackDestroyLLImageJ2CImpl(LLImageJ2CImpl* impl)
+std::string LLImageJ2COJ::getEngineInfo() const
 {
-	delete impl;
-	impl = NULL;
+	return std::string("OpenJPEG: " OPENJPEG_VERSION ", Runtime: ")
+		+ opj_version();
 }
 
 // Return string from message, eliminating final \n if present
@@ -200,19 +194,19 @@ LLImageJ2COJ::~LLImageJ2COJ()
 {
 }
 
-BOOL LLImageJ2COJ::initDecode(LLImageJ2C &base, LLImageRaw &raw_image, int discard_level, int* region)
+bool LLImageJ2COJ::initDecode(LLImageJ2C &base, LLImageRaw &raw_image, int discard_level, int* region)
 {
 	// No specific implementation for this method in the OpenJpeg case
-	return FALSE;
+	return false;
 }
 
-BOOL LLImageJ2COJ::initEncode(LLImageJ2C &base, LLImageRaw &raw_image, int blocks_size, int precincts_size, int levels)
+bool LLImageJ2COJ::initEncode(LLImageJ2C &base, LLImageRaw &raw_image, int blocks_size, int precincts_size, int levels)
 {
 	// No specific implementation for this method in the OpenJpeg case
-	return FALSE;
+	return false;
 }
 
-BOOL LLImageJ2COJ::decodeImpl(LLImageJ2C &base, LLImageRaw &raw_image, F32 decode_time, S32 first_channel, S32 max_channel_count)
+bool LLImageJ2COJ::decodeImpl(LLImageJ2C &base, LLImageRaw &raw_image, F32 decode_time, S32 first_channel, S32 max_channel_count)
 {
 	// <FS:Techwolf Lupindo> texture comment metadata reader
 	U8* c_data = base.getData();
@@ -304,7 +298,7 @@ BOOL LLImageJ2COJ::decodeImpl(LLImageJ2C &base, LLImageRaw &raw_image, F32 decod
 			opj_image_destroy(image);
 		}
 
-		return TRUE; // done
+		return true; // done
 	}
 
 	// sometimes we get bad data out of the cache - check to see if the decode succeeded
@@ -314,8 +308,8 @@ BOOL LLImageJ2COJ::decodeImpl(LLImageJ2C &base, LLImageRaw &raw_image, F32 decod
 		{
 			// if we didn't get the discard level we're expecting, fail
 			opj_image_destroy(image);
-			base.mDecoding = FALSE;
-			return TRUE;
+			base.mDecoding = false;
+			return true;
 		}
 	}
 	
@@ -327,7 +321,7 @@ BOOL LLImageJ2COJ::decodeImpl(LLImageJ2C &base, LLImageRaw &raw_image, F32 decod
 			opj_image_destroy(image);
 		}
 			
-		return TRUE;
+		return true;
 	}
 
 	// Copy image data into our raw image format (instead of the separate channel format
@@ -351,6 +345,16 @@ BOOL LLImageJ2COJ::decodeImpl(LLImageJ2C &base, LLImageRaw &raw_image, F32 decod
 	raw_image.resize(width, height, channels);
 	U8 *rawp = raw_image.getData();
 
+	// <FS:Ansariel> Port fix for MAINT-4327/MAINT-6584 to OpenJPEG decoder
+	if (!rawp)
+	{
+		base.setLastError("Memory error");
+		base.decodeFailed();
+		opj_image_destroy(image);
+		return true; // done
+	}
+	// <FS:Ansariel>
+
 	// first_channel is what channel to start copying from
 	// dest is what channel to copy to.  first_channel comes from the
 	// argument, dest always starts writing at channel zero.
@@ -374,18 +378,18 @@ BOOL LLImageJ2COJ::decodeImpl(LLImageJ2C &base, LLImageRaw &raw_image, F32 decod
 			LL_DEBUGS("Texture") << "ERROR -> decodeImpl: failed to decode image! (NULL comp data - OpenJPEG bug)" << LL_ENDL;
 			opj_image_destroy(image);
 
-			return TRUE; // done
+			return true; // done
 		}
 	}
 
 	/* free image data structure */
 	opj_image_destroy(image);
 
-	return TRUE; // done
+	return true; // done
 }
 
 
-BOOL LLImageJ2COJ::encodeImpl(LLImageJ2C &base, const LLImageRaw &raw_image, const char* comment_text, F32 encode_time, BOOL reversible)
+bool LLImageJ2COJ::encodeImpl(LLImageJ2C &base, const LLImageRaw &raw_image, const char* comment_text, F32 encode_time, bool reversible)
 {
 	const S32 MAX_COMPS = 5;
 	opj_cparameters_t parameters;	/* compression parameters */
@@ -495,7 +499,7 @@ BOOL LLImageJ2COJ::encodeImpl(LLImageJ2C &base, const LLImageRaw &raw_image, con
 	if (!bSuccess)
 	{
 		LL_DEBUGS("Texture") << "Failed to encode image." << LL_ENDL;
-		return FALSE;
+		return false;
 	}
 
 	codestream_length = pStreamdata->mOutput.size();
@@ -513,7 +517,7 @@ BOOL LLImageJ2COJ::encodeImpl(LLImageJ2C &base, const LLImageRaw &raw_image, con
 
 	/* free image data */
 	opj_image_destroy(image);
-	return TRUE;
+	return true;
 }
 
 inline S32 extractLong4( U8 const *aBuffer, int nOffset )
@@ -573,7 +577,7 @@ bool getMetadataFast( LLImageJ2C &aImage, S32 &aW, S32 &aH, S32 &aComps )
 	return true;
 }
 
-BOOL LLImageJ2COJ::getMetadata(LLImageJ2C &base)
+bool LLImageJ2COJ::getMetadata(LLImageJ2C &base)
 {
 	//
 	// FIXME: We get metadata by decoding the ENTIRE image.
@@ -589,7 +593,7 @@ BOOL LLImageJ2COJ::getMetadata(LLImageJ2C &base)
 	if ( getMetadataFast( base, width, height, img_components ) )
 	{
 		base.setSize(width, height, img_components);
-		return TRUE;
+		return true;
 	}
 
 	// Do it the old and slow way, decode the image with openjpeg
@@ -634,7 +638,7 @@ BOOL LLImageJ2COJ::getMetadata(LLImageJ2C &base)
 	if(!image)
 	{
 		LL_WARNS() << "ERROR -> getMetadata: failed to decode image!" << LL_ENDL;
-		return FALSE;
+		return false;
 	}
 
 	// Copy image data into our raw image format (instead of the separate channel format
@@ -647,5 +651,5 @@ BOOL LLImageJ2COJ::getMetadata(LLImageJ2C &base)
 
 	/* free image data structure */
 	opj_image_destroy(image);
-	return TRUE;
+	return true;
 }