Merge to XFA: Move lcms2 into third_party

Original Review URL: https://codereview.chromium.org/1181943008.
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1187273006.

1 files changed, 707 insertions, 0 deletions

diff --git a/third_party/lcms2-2.6/src/cmserr.c b/third_party/lcms2-2.6/src/cmserr.c
new file mode 100644
index 0000000000..743b4f5034
--- /dev/null
+++ b/third_party/lcms2-2.6/src/cmserr.c
@@ -0,0 +1,707 @@
+//---------------------------------------------------------------------------------
+//
+//  Little Color Management System
+//  Copyright (c) 1998-2012 Marti Maria Saguer
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the Software
+// is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
+// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+//---------------------------------------------------------------------------------
+
+#include "lcms2_internal.h"
+
+// I am so tired about incompatibilities on those functions that here are some replacements
+// that hopefully would be fully portable.
+
+// compare two strings ignoring case
+int CMSEXPORT cmsstrcasecmp(const char* s1, const char* s2)
+{
+    register const unsigned char *us1 = (const unsigned char *)s1,
+                                 *us2 = (const unsigned char *)s2;
+
+    while (toupper(*us1) == toupper(*us2++))
+        if (*us1++ == '\0')
+            return 0;
+
+    return (toupper(*us1) - toupper(*--us2));
+}
+
+// long int because C99 specifies ftell in such way (7.19.9.2)
+long int CMSEXPORT cmsfilelength(FILE* f)
+{
+    long int p , n;
+
+    p = ftell(f); // register current file position
+
+    if (fseek(f, 0, SEEK_END) != 0) {
+        return -1;
+    }
+
+    n = ftell(f);
+    fseek(f, p, SEEK_SET); // file position restored
+
+    return n;
+}
+
+#if 0
+// Memory handling ------------------------------------------------------------------
+//
+// This is the interface to low-level memory management routines. By default a simple
+// wrapping to malloc/free/realloc is provided, although there is a limit on the max
+// amount of memoy that can be reclaimed. This is mostly as a safety feature to prevent 
+// bogus or evil code to allocate huge blocks that otherwise lcms would never need.
+
+#define MAX_MEMORY_FOR_ALLOC  ((cmsUInt32Number)(1024U*1024U*512U))
+
+// User may override this behaviour by using a memory plug-in, which basically replaces
+// the default memory management functions. In this case, no check is performed and it
+// is up to the plug-in writter to keep in the safe side. There are only three functions
+// required to be implemented: malloc, realloc and free, although the user may want to
+// replace the optional mallocZero, calloc and dup as well.
+
+cmsBool   _cmsRegisterMemHandlerPlugin(cmsContext ContextID, cmsPluginBase* Plugin);
+
+// *********************************************************************************
+
+// This is the default memory allocation function. It does a very coarse
+// check of amout of memory, just to prevent exploits
+static
+void* _cmsMallocDefaultFn(cmsContext ContextID, cmsUInt32Number size)
+{
+    if (size > MAX_MEMORY_FOR_ALLOC) return NULL;  // Never allow over maximum
+
+    return (void*) malloc(size);
+
+    cmsUNUSED_PARAMETER(ContextID);
+}
+
+// Generic allocate & zero
+static
+void* _cmsMallocZeroDefaultFn(cmsContext ContextID, cmsUInt32Number size)
+{
+    void *pt = _cmsMalloc(ContextID, size);
+    if (pt == NULL) return NULL;
+
+    memset(pt, 0, size);
+    return pt;
+}
+
+
+// The default free function. The only check proformed is against NULL pointers
+static
+void _cmsFreeDefaultFn(cmsContext ContextID, void *Ptr)
+{
+    // free(NULL) is defined a no-op by C99, therefore it is safe to
+    // avoid the check, but it is here just in case...
+
+    if (Ptr) free(Ptr);
+
+    cmsUNUSED_PARAMETER(ContextID);
+}
+
+// The default realloc function. Again it checks for exploits. If Ptr is NULL,
+// realloc behaves the same way as malloc and allocates a new block of size bytes.
+static
+void* _cmsReallocDefaultFn(cmsContext ContextID, void* Ptr, cmsUInt32Number size)
+{
+
+    if (size > MAX_MEMORY_FOR_ALLOC) return NULL;  // Never realloc over 512Mb
+
+    return realloc(Ptr, size);
+
+    cmsUNUSED_PARAMETER(ContextID);
+}
+
+
+// The default calloc function. Allocates an array of num elements, each one of size bytes
+// all memory is initialized to zero.
+static
+void* _cmsCallocDefaultFn(cmsContext ContextID, cmsUInt32Number num, cmsUInt32Number size)
+{
+    cmsUInt32Number Total = num * size;
+
+    // Preserve calloc behaviour
+    if (Total == 0) return NULL;
+
+    // Safe check for overflow.
+    if (num >= UINT_MAX / size) return NULL;
+
+    // Check for overflow
+    if (Total < num || Total < size) {
+        return NULL;
+    }
+
+    if (Total > MAX_MEMORY_FOR_ALLOC) return NULL;  // Never alloc over 512Mb
+
+    return _cmsMallocZero(ContextID, Total);
+}
+
+// Generic block duplication
+static
+void* _cmsDupDefaultFn(cmsContext ContextID, const void* Org, cmsUInt32Number size)
+{
+    void* mem;
+
+    if (size > MAX_MEMORY_FOR_ALLOC) return NULL;  // Never dup over 512Mb
+
+    mem = _cmsMalloc(ContextID, size);
+
+    if (mem != NULL && Org != NULL)
+        memmove(mem, Org, size);
+
+    return mem;
+}
+
+
+// Pointers to memory manager functions in Context0
+_cmsMemPluginChunkType _cmsMemPluginChunk = { _cmsMallocDefaultFn, _cmsMallocZeroDefaultFn, _cmsFreeDefaultFn, 
+                                              _cmsReallocDefaultFn, _cmsCallocDefaultFn,    _cmsDupDefaultFn
+                                            };
+
+
+// Reset and duplicate memory manager
+void _cmsAllocMemPluginChunk(struct _cmsContext_struct* ctx, const struct _cmsContext_struct* src)
+{
+    _cmsAssert(ctx != NULL);
+
+    if (src != NULL) {    
+
+        // Duplicate
+        ctx ->chunks[MemPlugin] = _cmsSubAllocDup(ctx ->MemPool, src ->chunks[MemPlugin], sizeof(_cmsMemPluginChunkType));  
+    }
+    else {
+
+        // To reset it, we use the default allocators, which cannot be overriden
+        ctx ->chunks[MemPlugin] = &ctx ->DefaultMemoryManager;
+    } 
+}
+
+// Auxiliar to fill memory management functions from plugin (or context 0 defaults)
+void _cmsInstallAllocFunctions(cmsPluginMemHandler* Plugin, _cmsMemPluginChunkType* ptr)
+{
+    if (Plugin == NULL) {
+
+        memcpy(ptr, &_cmsMemPluginChunk, sizeof(_cmsMemPluginChunk));
+    }
+    else {
+
+        ptr ->MallocPtr  = Plugin -> MallocPtr;
+        ptr ->FreePtr    = Plugin -> FreePtr;
+        ptr ->ReallocPtr = Plugin -> ReallocPtr;
+
+        // Make sure we revert to defaults
+        ptr ->MallocZeroPtr= _cmsMallocZeroDefaultFn;
+        ptr ->CallocPtr    = _cmsCallocDefaultFn;
+        ptr ->DupPtr       = _cmsDupDefaultFn;
+      
+        if (Plugin ->MallocZeroPtr != NULL) ptr ->MallocZeroPtr = Plugin -> MallocZeroPtr;
+        if (Plugin ->CallocPtr != NULL)     ptr ->CallocPtr     = Plugin -> CallocPtr;
+        if (Plugin ->DupPtr != NULL)        ptr ->DupPtr        = Plugin -> DupPtr;
+        
+    }
+}
+
+
+// Plug-in replacement entry
+cmsBool  _cmsRegisterMemHandlerPlugin(cmsContext ContextID, cmsPluginBase *Data)
+{
+    cmsPluginMemHandler* Plugin = (cmsPluginMemHandler*) Data;     
+    _cmsMemPluginChunkType* ptr;
+
+    // NULL forces to reset to defaults. In this special case, the defaults are stored in the context structure. 
+    // Remaining plug-ins does NOT have any copy in the context structure, but this is somehow special as the
+    // context internal data should be malloce'd by using those functions. 
+    if (Data == NULL) {
+
+       struct _cmsContext_struct* ctx = ( struct _cmsContext_struct*) ContextID;
+
+       // Return to the default allocators
+        if (ContextID != NULL) {
+            ctx->chunks[MemPlugin] = (void*) &ctx->DefaultMemoryManager;
+        }
+        return TRUE;
+    }
+
+    // Check for required callbacks
+    if (Plugin -> MallocPtr == NULL ||
+        Plugin -> FreePtr == NULL ||
+        Plugin -> ReallocPtr == NULL) return FALSE;
+
+    // Set replacement functions
+    ptr = (_cmsMemPluginChunkType*) _cmsContextGetClientChunk(ContextID, MemPlugin);
+    if (ptr == NULL) 
+        return FALSE;
+
+    _cmsInstallAllocFunctions(Plugin, ptr);
+    return TRUE;
+}
+#else
+#include "../../../core/include/fxcrt/fx_memory.h"
+#include "../../../core/include/fxcrt/fx_system.h"
+
+cmsBool  _cmsRegisterMemHandlerPlugin(cmsContext ContextID, cmsPluginBase* Plugin)
+{
+	return TRUE;
+}
+
+// Generic allocate
+void* CMSEXPORT _cmsMalloc(cmsContext ContextID, cmsUInt32Number size)
+{
+    return FXMEM_DefaultAlloc(size, 1);
+}
+
+// Generic allocate & zero
+void* CMSEXPORT _cmsMallocZero(cmsContext ContextID, cmsUInt32Number size)
+{
+	void* p = FXMEM_DefaultAlloc(size, 1);
+	if (p) FXSYS_memset(p, 0, size);
+	return p;
+}
+
+// Generic calloc
+void* CMSEXPORT _cmsCalloc(cmsContext ContextID, cmsUInt32Number num, cmsUInt32Number size)
+{
+	cmsUInt32Number total = num * size;
+	if (total == 0 || total / size != num || total >= 512 * 1024 * 1024)
+		return NULL;
+
+	return _cmsMallocZero(ContextID, num * size);
+}
+
+// Generic reallocate
+void* CMSEXPORT _cmsRealloc(cmsContext ContextID, void* Ptr, cmsUInt32Number size)
+{
+	return FXMEM_DefaultRealloc(Ptr, size, 1);
+}
+
+// Generic free memory
+void CMSEXPORT _cmsFree(cmsContext ContextID, void* Ptr)
+{
+	if (Ptr != NULL) FXMEM_DefaultFree(Ptr, 0);
+}
+
+// Generic block duplication
+void* CMSEXPORT _cmsDupMem(cmsContext ContextID, const void* Org, cmsUInt32Number size)
+{
+	void* p = FXMEM_DefaultAlloc(size, 1);
+	FXSYS_memmove(p, Org, size);
+	return p;
+}
+
+_cmsMemPluginChunkType _cmsMemPluginChunk = {_cmsMalloc, _cmsMallocZero, _cmsFree, 
+	                                         _cmsRealloc, _cmsCalloc,    _cmsDupMem
+                                            };
+
+void _cmsAllocMemPluginChunk(struct _cmsContext_struct* ctx, const struct _cmsContext_struct* src)
+{
+	_cmsAssert(ctx != NULL);
+
+	if (src != NULL) {    
+
+		// Duplicate
+		ctx ->chunks[MemPlugin] = _cmsSubAllocDup(ctx ->MemPool, src ->chunks[MemPlugin], sizeof(_cmsMemPluginChunkType));  
+	}
+	else {
+
+		// To reset it, we use the default allocators, which cannot be overriden
+		ctx ->chunks[MemPlugin] = &ctx ->DefaultMemoryManager;
+	} 
+}
+
+void _cmsInstallAllocFunctions(cmsPluginMemHandler* Plugin, _cmsMemPluginChunkType* ptr)
+{
+	if (Plugin == NULL) {
+
+		memcpy(ptr, &_cmsMemPluginChunk, sizeof(_cmsMemPluginChunk));
+	}
+	else {
+
+		ptr ->MallocPtr  = Plugin -> MallocPtr;
+		ptr ->FreePtr    = Plugin -> FreePtr;
+		ptr ->ReallocPtr = Plugin -> ReallocPtr;
+
+		// Make sure we revert to defaults
+		ptr ->MallocZeroPtr= _cmsMallocZero;
+		ptr ->CallocPtr    = _cmsCalloc;
+		ptr ->DupPtr       = _cmsDupMem;
+
+		if (Plugin ->MallocZeroPtr != NULL) ptr ->MallocZeroPtr = Plugin -> MallocZeroPtr;
+		if (Plugin ->CallocPtr != NULL)     ptr ->CallocPtr     = Plugin -> CallocPtr;
+		if (Plugin ->DupPtr != NULL)        ptr ->DupPtr        = Plugin -> DupPtr;
+
+	}
+}
+#endif
+
+// ********************************************************************************************
+
+// Sub allocation takes care of many pointers of small size. The memory allocated in
+// this way have be freed at once. Next function allocates a single chunk for linked list
+// I prefer this method over realloc due to the big inpact on xput realloc may have if
+// memory is being swapped to disk. This approach is safer (although that may not be true on all platforms)
+static
+_cmsSubAllocator_chunk* _cmsCreateSubAllocChunk(cmsContext ContextID, cmsUInt32Number Initial)
+{
+    _cmsSubAllocator_chunk* chunk;
+
+    // 20K by default
+    if (Initial == 0)
+        Initial = 20*1024;
+
+    // Create the container
+    chunk = (_cmsSubAllocator_chunk*) _cmsMallocZero(ContextID, sizeof(_cmsSubAllocator_chunk));
+    if (chunk == NULL) return NULL;
+
+    // Initialize values
+    chunk ->Block     = (cmsUInt8Number*) _cmsMalloc(ContextID, Initial);
+    if (chunk ->Block == NULL) {
+
+        // Something went wrong
+        _cmsFree(ContextID, chunk);
+        return NULL;
+    }
+
+    chunk ->BlockSize = Initial;
+    chunk ->Used      = 0;
+    chunk ->next      = NULL;
+
+    return chunk;
+}
+
+// The suballocated is nothing but a pointer to the first element in the list. We also keep
+// the thread ID in this structure.
+_cmsSubAllocator* _cmsCreateSubAlloc(cmsContext ContextID, cmsUInt32Number Initial)
+{
+    _cmsSubAllocator* sub;
+
+    // Create the container
+    sub = (_cmsSubAllocator*) _cmsMallocZero(ContextID, sizeof(_cmsSubAllocator));
+    if (sub == NULL) return NULL;
+
+    sub ->ContextID = ContextID;
+
+    sub ->h = _cmsCreateSubAllocChunk(ContextID, Initial);
+    if (sub ->h == NULL) {
+        _cmsFree(ContextID, sub);
+        return NULL;
+    }
+
+    return sub;
+}
+
+
+// Get rid of whole linked list
+void _cmsSubAllocDestroy(_cmsSubAllocator* sub)
+{
+    _cmsSubAllocator_chunk *chunk, *n;
+
+    for (chunk = sub ->h; chunk != NULL; chunk = n) {
+
+        n = chunk->next;
+        if (chunk->Block != NULL) _cmsFree(sub ->ContextID, chunk->Block);
+        _cmsFree(sub ->ContextID, chunk);
+    }
+
+    // Free the header
+    _cmsFree(sub ->ContextID, sub);
+}
+
+
+// Get a pointer to small memory block.
+void*  _cmsSubAlloc(_cmsSubAllocator* sub, cmsUInt32Number size)
+{
+    cmsUInt32Number Free = sub -> h ->BlockSize - sub -> h -> Used;
+    cmsUInt8Number* ptr;
+
+    size = _cmsALIGNMEM(size);
+
+    // Check for memory. If there is no room, allocate a new chunk of double memory size.
+    if (size > Free) {
+
+        _cmsSubAllocator_chunk* chunk;
+        cmsUInt32Number newSize;
+
+        newSize = sub -> h ->BlockSize * 2;
+        if (newSize < size) newSize = size;
+
+        chunk = _cmsCreateSubAllocChunk(sub -> ContextID, newSize);
+        if (chunk == NULL) return NULL;
+
+        // Link list
+        chunk ->next = sub ->h;
+        sub ->h    = chunk;
+
+    }
+
+    ptr =  sub -> h ->Block + sub -> h ->Used;
+    sub -> h -> Used += size;
+
+    return (void*) ptr;
+}
+
+// Duplicate in pool
+void* _cmsSubAllocDup(_cmsSubAllocator* s, const void *ptr, cmsUInt32Number size)
+{
+    void *NewPtr;
+    
+    // Dup of null pointer is also NULL
+    if (ptr == NULL)
+        return NULL;
+
+    NewPtr = _cmsSubAlloc(s, size);
+
+    if (ptr != NULL && NewPtr != NULL) {
+        memcpy(NewPtr, ptr, size);
+    }
+
+    return NewPtr;
+}
+
+
+
+// Error logging ******************************************************************
+
+// There is no error handling at all. When a funtion fails, it returns proper value.
+// For example, all create functions does return NULL on failure. Other return FALSE
+// It may be interesting, for the developer, to know why the function is failing.
+// for that reason, lcms2 does offer a logging function. This function does recive
+// a ENGLISH string with some clues on what is going wrong. You can show this
+// info to the end user, or just create some sort of log.
+// The logging function should NOT terminate the program, as this obviously can leave
+// resources. It is the programmer's responsability to check each function return code
+// to make sure it didn't fail.
+
+// Error messages are limited to MAX_ERROR_MESSAGE_LEN
+
+#define MAX_ERROR_MESSAGE_LEN   1024
+
+// ---------------------------------------------------------------------------------------------------------
+
+// This is our default log error
+static void DefaultLogErrorHandlerFunction(cmsContext ContextID, cmsUInt32Number ErrorCode, const char *Text);
+
+// Context0 storage, which is global
+_cmsLogErrorChunkType _cmsLogErrorChunk = { DefaultLogErrorHandlerFunction };
+
+// Allocates and inits error logger container for a given context. If src is NULL, only initializes the value
+// to the default. Otherwise, it duplicates the value. The interface is standard across all context clients
+void _cmsAllocLogErrorChunk(struct _cmsContext_struct* ctx, 
+                            const struct _cmsContext_struct* src)
+{    
+    static _cmsLogErrorChunkType LogErrorChunk = { DefaultLogErrorHandlerFunction };
+    void* from;
+     
+     if (src != NULL) {
+        from = src ->chunks[Logger];       
+    }
+    else {
+       from = &LogErrorChunk;
+    }
+    
+    ctx ->chunks[Logger] = _cmsSubAllocDup(ctx ->MemPool, from, sizeof(_cmsLogErrorChunkType));   
+}
+
+// The default error logger does nothing.
+static
+void DefaultLogErrorHandlerFunction(cmsContext ContextID, cmsUInt32Number ErrorCode, const char *Text)
+{
+    // fprintf(stderr, "[lcms]: %s\n", Text);
+    // fflush(stderr);
+
+     cmsUNUSED_PARAMETER(ContextID);
+     cmsUNUSED_PARAMETER(ErrorCode);
+     cmsUNUSED_PARAMETER(Text);
+}
+
+// Change log error, context based
+void CMSEXPORT cmsSetLogErrorHandlerTHR(cmsContext ContextID, cmsLogErrorHandlerFunction Fn)
+{
+    _cmsLogErrorChunkType* lhg = (_cmsLogErrorChunkType*) _cmsContextGetClientChunk(ContextID, Logger);
+
+    if (lhg != NULL) {
+
+        if (Fn == NULL)
+            lhg -> LogErrorHandler = DefaultLogErrorHandlerFunction;
+        else
+            lhg -> LogErrorHandler = Fn;
+    }
+}
+
+// Change log error, legacy
+void CMSEXPORT cmsSetLogErrorHandler(cmsLogErrorHandlerFunction Fn)
+{
+    cmsSetLogErrorHandlerTHR(NULL, Fn);    
+}
+
+// Log an error
+// ErrorText is a text holding an english description of error.
+void CMSEXPORT cmsSignalError(cmsContext ContextID, cmsUInt32Number ErrorCode, const char *ErrorText, ...)
+{
+    va_list args;
+    char Buffer[MAX_ERROR_MESSAGE_LEN];
+    _cmsLogErrorChunkType* lhg;
+
+
+    va_start(args, ErrorText);
+    vsnprintf(Buffer, MAX_ERROR_MESSAGE_LEN-1, ErrorText, args);
+    va_end(args);
+
+    // Check for the context, if specified go there. If not, go for the global
+    lhg = (_cmsLogErrorChunkType*) _cmsContextGetClientChunk(ContextID, Logger);
+    if (lhg ->LogErrorHandler) {
+        lhg ->LogErrorHandler(ContextID, ErrorCode, Buffer);
+    }   
+}
+
+// Utility function to print signatures
+void _cmsTagSignature2String(char String[5], cmsTagSignature sig)
+{
+    cmsUInt32Number be;
+
+    // Convert to big endian
+    be = _cmsAdjustEndianess32((cmsUInt32Number) sig);
+
+    // Move chars
+    memmove(String, &be, 4);
+
+    // Make sure of terminator
+    String[4] = 0;
+}
+
+//--------------------------------------------------------------------------------------------------
+
+
+static
+void* defMtxCreate(cmsContext id)
+{
+    _cmsMutex* ptr_mutex = (_cmsMutex*) _cmsMalloc(id, sizeof(_cmsMutex));
+    _cmsInitMutexPrimitive(ptr_mutex);
+    return (void*) ptr_mutex;   
+}
+
+static
+void defMtxDestroy(cmsContext id, void* mtx)
+{
+    _cmsDestroyMutexPrimitive((_cmsMutex *) mtx); 
+    _cmsFree(id, mtx);
+}
+
+static
+cmsBool defMtxLock(cmsContext id, void* mtx)
+{
+    cmsUNUSED_PARAMETER(id);
+    return _cmsLockPrimitive((_cmsMutex *) mtx) == 0;     
+}
+
+static
+void defMtxUnlock(cmsContext id, void* mtx)
+{
+    cmsUNUSED_PARAMETER(id);
+    _cmsUnlockPrimitive((_cmsMutex *) mtx); 
+}
+
+
+
+// Pointers to memory manager functions in Context0
+_cmsMutexPluginChunkType _cmsMutexPluginChunk = { defMtxCreate, defMtxDestroy, defMtxLock, defMtxUnlock };
+
+// Allocate and init mutex container.
+void _cmsAllocMutexPluginChunk(struct _cmsContext_struct* ctx, 
+                                        const struct _cmsContext_struct* src)
+{
+    static _cmsMutexPluginChunkType MutexChunk = {defMtxCreate, defMtxDestroy, defMtxLock, defMtxUnlock };
+    void* from;
+     
+     if (src != NULL) {
+        from = src ->chunks[MutexPlugin];       
+    }
+    else {
+       from = &MutexChunk;
+    }
+    
+    ctx ->chunks[MutexPlugin] = _cmsSubAllocDup(ctx ->MemPool, from, sizeof(_cmsMutexPluginChunkType));   
+}
+
+// Register new ways to transform
+cmsBool  _cmsRegisterMutexPlugin(cmsContext ContextID, cmsPluginBase* Data)
+{
+    cmsPluginMutex* Plugin = (cmsPluginMutex*) Data;
+    _cmsMutexPluginChunkType* ctx = ( _cmsMutexPluginChunkType*) _cmsContextGetClientChunk(ContextID, MutexPlugin);
+
+    if (Data == NULL) {
+
+        // No lock routines
+        ctx->CreateMutexPtr = NULL; 
+        ctx->DestroyMutexPtr = NULL; 
+        ctx->LockMutexPtr = NULL;
+        ctx ->UnlockMutexPtr = NULL;
+        return TRUE;
+    }
+
+    // Factory callback is required
+    if (Plugin ->CreateMutexPtr == NULL || Plugin ->DestroyMutexPtr == NULL || 
+        Plugin ->LockMutexPtr == NULL || Plugin ->UnlockMutexPtr == NULL) return FALSE;
+
+
+    ctx->CreateMutexPtr  = Plugin->CreateMutexPtr;
+    ctx->DestroyMutexPtr = Plugin ->DestroyMutexPtr;
+    ctx ->LockMutexPtr   = Plugin ->LockMutexPtr;
+    ctx ->UnlockMutexPtr = Plugin ->UnlockMutexPtr;
+
+    // All is ok
+    return TRUE;
+}
+
+// Generic Mutex fns
+void* CMSEXPORT _cmsCreateMutex(cmsContext ContextID)
+{
+    _cmsMutexPluginChunkType* ptr = (_cmsMutexPluginChunkType*) _cmsContextGetClientChunk(ContextID, MutexPlugin);
+
+    if (ptr ->CreateMutexPtr == NULL) return NULL;
+
+    return ptr ->CreateMutexPtr(ContextID);
+}
+
+void CMSEXPORT _cmsDestroyMutex(cmsContext ContextID, void* mtx)
+{
+    _cmsMutexPluginChunkType* ptr = (_cmsMutexPluginChunkType*) _cmsContextGetClientChunk(ContextID, MutexPlugin);
+
+    if (ptr ->DestroyMutexPtr != NULL) {
+
+        ptr ->DestroyMutexPtr(ContextID, mtx);
+    }
+}
+
+cmsBool CMSEXPORT _cmsLockMutex(cmsContext ContextID, void* mtx)
+{
+    _cmsMutexPluginChunkType* ptr = (_cmsMutexPluginChunkType*) _cmsContextGetClientChunk(ContextID, MutexPlugin);
+
+    if (ptr ->LockMutexPtr == NULL) return TRUE;
+
+    return ptr ->LockMutexPtr(ContextID, mtx);
+}
+
+void CMSEXPORT _cmsUnlockMutex(cmsContext ContextID, void* mtx)
+{
+    _cmsMutexPluginChunkType* ptr = (_cmsMutexPluginChunkType*) _cmsContextGetClientChunk(ContextID, MutexPlugin);
+
+    if (ptr ->UnlockMutexPtr != NULL) {
+
+        ptr ->UnlockMutexPtr(ContextID, mtx);
+    }
+}