Modules/clmodule.c - platform/external/python/cpython2 - Gitiles

 /***********************************************************
 Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The
 Netherlands.

                         All Rights Reserved

 Permission to use, copy, modify, and distribute this software and its
 documentation for any purpose and without fee is hereby granted,
 provided that the above copyright notice appear in all copies and that
 both that copyright notice and this permission notice appear in
 supporting documentation, and that the names of Stichting Mathematisch
 Centrum or CWI not be used in advertising or publicity pertaining to
 distribution of the software without specific, written prior permission.

 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 ******************************************************************/


 /* Cl objects */

 #include <stdarg.h>
 #include <cl.h>
 #include "allobjects.h"
 #include "modsupport.h"		/* For getargs() etc. */
 #include "ceval.h"		/* For call_object() */

 typedef struct {
 	OB_HEAD
 	int ob_isCompressor;	/* Compressor or Decompressor */
 	CL_CompressorHdl ob_compressorHdl;
 	long ob_dataMaxSize;
 	long ob_frameSize;
 	object *ob_callbackFunc;
 	object *ob_callbackID;
 	object *ob_data;
 } clobject;

 #define CheckCompressor(self)	if ((self)->ob_compressorHdl == NULL) { \
 					err_setstr(RuntimeError, "(de)compressor not active"); \
 					return NULL; \
 					}

 extern typeobject Cltype;	/* Really static, forward */

 #define is_clobject(v)		((v)->ob_type == &Cltype)

 static object *ClError;		/* exception cl.error */

 static int error_handler_called = 0;

 static void
 cl_ErrorHandler(long errnum, const char *fmt, ...)
 {
 	va_list ap;
 	char errbuf[BUFSIZ];	/* hopefully big enough */
 	char *p;

 	if (err_occurred())	/* don't change existing error */
 		return;
 	error_handler_called = 1;
 	va_start(ap, fmt);
 	vsprintf(errbuf, fmt, ap);
 	va_end(ap);
 	p = &errbuf[strlen(errbuf) - 1]; /* swat the line feed */
 	if (*p == '\n')
 		*p = 0;
 	err_setstr(ClError, errbuf);
 }

 static object *
 doClose(self, args, close_func)
 	clobject *self;
 	object *args;
 	long (*close_func) PROTO((CL_CompressorHdl));
 {
 	CheckCompressor(self);

 	if (!getnoarg(args))
 		return NULL;

 	if ((*close_func)(self->ob_compressorHdl) == FAILURE) {
 		if (!error_handler_called)
 			err_setstr(ClError, "CloseCompressor failed");
 		return NULL;
 	}

 	self->ob_compressorHdl = NULL;

 	INCREF(None);
 	return None;
 }

 static object *
 clm_CloseCompressor(self, args)
 	clobject *self;
 	object *args;
 {
 	return doClose(self, args, clCloseCompressor);
 }

 static object *
 clm_CloseDecompressor(self, args)
 	clobject *self;
 	object *args;
 {
 	return doClose(self, args, clCloseDecompressor);
 }

 static object *
 clm_Compress(self, args)
 	clobject *self;
 	object *args;
 {
 	object *data;
 	long frameIndex, numberOfFrames, dataSize;

 	CheckCompressor(self);

 	if (!getargs(args, "(ii)", &frameIndex, &numberOfFrames))
 		return NULL;

 	dataSize = self->ob_dataMaxSize;
 	data = newsizedstringobject(NULL, dataSize);
 	if (data == NULL)
 		return NULL;

 	error_handler_called = 0;
 	if (clCompress(self->ob_compressorHdl, frameIndex, numberOfFrames,
 		       &dataSize, (void *) getstringvalue(data)) == FAILURE) {
 		DECREF(data);
 		if (!error_handler_called && !err_occurred())
 			err_setstr(ClError, "compress failed");
 		return NULL;
 	}

 	if (dataSize < self->ob_dataMaxSize)
 		if (resizestring(&data, dataSize))
 			return NULL;

 	if (dataSize > self->ob_dataMaxSize) {
 		/* we didn't get all data */
 		DECREF(data);
 		err_setstr(ClError, "buffer too small for compressed image");
 		return NULL;
 	}

 	return data;
 }

 static object *
 clm_Decompress(self, args)
 	clobject *self;
 	object *args;
 {
 	object *data;
 	long frameIndex, numberOfFrames;

 	CheckCompressor(self);

 	if (!getargs(args, "(ii)", &frameIndex, &numberOfFrames))
 		return NULL;

 	data = newsizedstringobject(NULL,
 				    numberOfFrames * self->ob_frameSize);
 	if (data == NULL)
 		return NULL;

 	error_handler_called = 0;
 	if (clDecompress(self->ob_compressorHdl, frameIndex, numberOfFrames,
 			 (void *) getstringvalue(data)) == FAILURE) {
 		DECREF(data);
 		if (!error_handler_called && !err_occurred())
 			err_setstr(ClError, "decompress failed");
 		return NULL;
 	}

 	return data;
 }

 static object *
 clm_GetCompressorInfo(self, args)
 	clobject *self;
 	object *args;
 {
 	long result, infoSize;
 	void *info;
 	object *infoObject, *res;

 	CheckCompressor(self);

 	if (!getnoarg(args))
 		return NULL;

 	error_handler_called = 0;
 	if (clGetCompressorInfo(self->ob_compressorHdl, &infoSize, &info) == FAILURE) {
 		if (!error_handler_called)
 			err_setstr(ClError, "getcompressorinfo failed");
 		return NULL;
 	}

 	return newsizedstringobject((char *) info, infoSize);
 }

 static object *
 clm_GetDefault(self, args)
 	clobject *self;
 	object *args;
 {
 	long initial, result;

 	CheckCompressor(self);

 	if (!getargs(args, "i", &initial))
 		return NULL;

 	error_handler_called = 0;
 	result = clGetDefault(self->ob_compressorHdl, initial);
 	if (error_handler_called)
 		return NULL;

 	return newintobject(result);
 }

 static object *
 clm_GetMinMax(self, args)
 	clobject *self;
 	object *args;
 {
 	long param, min, max;

 	CheckCompressor(self);

 	if (!getargs(args, "i", &param))
 		return NULL;

 	error_handler_called = 0;
 	clGetMinMax(self->ob_compressorHdl, param, &min, &max);
 	if (error_handler_called)
 		return NULL;

 	return mkvalue("(ii)", min, max);
 }

 static object *
 clm_GetName(self, args)
 	clobject *self;
 	object *args;
 {
 	long descriptor;
 	char *name;

 	CheckCompressor(self);

 	if (!getargs(args, "i", &descriptor))
 		return NULL;

 	error_handler_called = 0;
 	name = clGetName(self->ob_compressorHdl, descriptor);
 	if (error_handler_called)
 		return NULL;
 	if (name == NULL) {
 		err_setstr(ClError, "getname failed");
 		return NULL;
 	}

 	return newstringobject(name);
 }

 static object *
 doParams(self, args, func, modified)
 	clobject *self;
 	object *args;
 	void (*func)(CL_CompressorHdl, long *, long);
 	int modified;
 {
 	object *list, *v;
 	long *PVbuffer;
 	long length;
 	int i;

 	CheckCompressor(self);

 	if (!getargs(args, "O", &list))
 		return NULL;
 	if (!is_listobject(list)) {
 		err_badarg();
 		return NULL;
 	}
 	length = getlistsize(list);
 	PVbuffer = NEW(long, length);
 	if (PVbuffer == NULL)
 		return err_nomem();
 	for (i = 0; i < length; i++) {
 		v = getlistitem(list, i);
 		if (!is_intobject(v)) {
 			DEL(PVbuffer);
 			err_badarg();
 			return NULL;
 		}
 		PVbuffer[i] = getintvalue(v);
 	}

 	error_handler_called = 0;
 	(*func)(self->ob_compressorHdl, PVbuffer, length);
 	if (error_handler_called)
 		return NULL;

 	if (modified) {
 		for (i = 0; i < length; i++)
 			setlistitem(list, i, newintobject(PVbuffer[i]));
 	}

 	DEL(PVbuffer);

 	INCREF(None);
 	return None;
 }

 static object *
 clm_GetParams(self, args)
 	object *self, *args;
 {
 	return doParams(self, args, clGetParams, 1);
 }

 static object *
 clm_SetParams(self, args)
 	object *self, *args;
 {
 	return doParams(self, args, clSetParams, 0);
 }

 static object *
 clm_QueryParams(self, args)
 	clobject *self;
 	object *args;
 {
 	long bufferlength;
 	long *PVbuffer;
 	object *list;
 	int i;

 	CheckCompressor(self);

 	if (!getnoarg(args))
 		return NULL;

 	error_handler_called = 0;
 	bufferlength = clQueryParams(self->ob_compressorHdl, 0, 0);
 	if (error_handler_called)
 		return NULL;

 	PVbuffer = NEW(long, bufferlength);
 	if (PVbuffer == NULL)
 		return err_nomem();

 	bufferlength = clQueryParams(self->ob_compressorHdl, PVbuffer,
 				     bufferlength);
 	if (error_handler_called) {
 		DEL(PVbuffer);
 		return NULL;
 	}

 	list = newlistobject(bufferlength);
 	if (list == NULL) {
 		DEL(PVbuffer);
 		return NULL;
 	}

 	for (i = 0; i < bufferlength; i++) {
 		if (i & 1)
 			setlistitem(list, i, newintobject(PVbuffer[i]));
 		else
 			setlistitem(list, i, newstringobject((char *) PVbuffer[i]));
 	}

 	DEL(PVbuffer);

 	return list;
 }

 static struct methodlist compressor_methods[] = {
 	{"CloseCompressor",	clm_CloseCompressor},
 	{"Compress",		clm_Compress},
 	{"GetCompressorInfo",	clm_GetCompressorInfo},
 	{"GetDefault",		clm_GetDefault},
 	{"GetMinMax",		clm_GetMinMax},
 	{"GetName",		clm_GetName},
 	{"GetParams",		clm_GetParams},
 	{"QueryParams",		clm_QueryParams},
 	{"SetParams",		clm_SetParams},
 	{NULL,			NULL}		/* sentinel */
 };

 static struct methodlist decompressor_methods[] = {
 	{"CloseDecompressor",	clm_CloseDecompressor},
 	{"Decompress",		clm_Decompress},
 	{"GetDefault",		clm_GetDefault},
 	{"GetMinMax",		clm_GetMinMax},
 	{"GetName",		clm_GetName},
 	{"GetParams",		clm_GetParams},
 	{"QueryParams",		clm_QueryParams},
 	{"SetParams",		clm_SetParams},
 	{NULL,			NULL}		/* sentinel */
 };

 static void
 cl_dealloc(self)
 	clobject *self;
 {
 	if (self->ob_compressorHdl) {
 		if (self->ob_isCompressor)
 			clCloseCompressor(self->ob_compressorHdl);
 		else
 			clCloseDecompressor(self->ob_compressorHdl);
 	}
 	XDECREF(self->ob_callbackFunc);
 	XDECREF(self->ob_callbackID);
 	XDECREF(self->ob_data);
 	DEL(self);
 }

 static object *
 cl_getattr(self, name)
 	clobject *self;
 	char *name;
 {
 	if (self->ob_isCompressor)
 		return findmethod(compressor_methods, (object *)self, name);
 	else
 		return findmethod(decompressor_methods, (object *) self, name);
 }

 static typeobject Cltype = {
 	OB_HEAD_INIT(&Typetype)
 	0,			/*ob_size*/
 	"cl",			/*tp_name*/
 	sizeof(clobject),	/*tp_size*/
 	0,			/*tp_itemsize*/
 	/* methods */
 	cl_dealloc,		/*tp_dealloc*/
 	0,			/*tp_print*/
 	cl_getattr,		/*tp_getattr*/
 	0,			/*tp_setattr*/
 	0,			/*tp_compare*/
 	0,			/*tp_repr*/
 	0,			/*tp_as_number*/
 	0,			/*tp_as_sequence*/
 	0,			/*tp_as_mapping*/
 };

 static long
 GetFrame(callbackID, frameIndex, numberOfFrames, data)
 	void *callbackID;
 	long frameIndex;
 	long numberOfFrames;
 	void **data;
 {
 	object *args;
 	clobject *self = (clobject *) callbackID;
 	object *result;

 	args = mkvalue("(Oii)", self->ob_callbackID, frameIndex,
 		       numberOfFrames);
 	if (args == NULL)
 		return FAILURE;

 	result = call_object(self->ob_callbackFunc, args);
 	DECREF(args);
 	if (result == NULL)
 		return FAILURE;

 	if (!is_stringobject(result)) {
 		DECREF(result);
 		return FAILURE;
 	}

 	XDECREF(self->ob_data);
 	self->ob_data = result;

 	*data = (void *) getstringvalue(result);

 	return SUCCESS;
 }

 static long
 GetData(callbackID, frameIndex, numberOfFrames, dataSize, data)
 	void *callbackID;
 	long frameIndex;
 	long numberOfFrames;
 	long *dataSize;
 	void **data;
 {
 	object *args, *result;
 	clobject *self = (clobject *) callbackID;

 	args = mkvalue("(Oii)", self->ob_callbackID, frameIndex,
 		       numberOfFrames);
 	if (args == NULL)
 		return FAILURE;

 	result = call_object(self->ob_callbackFunc, args);
 	DECREF(args);
 	if (result == NULL)
 		return FAILURE;

 	if (!is_stringobject(result)) {
 		DECREF(result);
 		return FAILURE;
 	}

 	XDECREF(self->ob_data);
 	self->ob_data = result;

 	*dataSize = getstringsize(result);
 	*data = (void *) getstringvalue(result);

 	return SUCCESS;
 }

 static object *
 cl_OpenCompressor(self, args)
 	object *self, *args;
 {
 	CL_CompressionFormat compressionFormat;
 	long qualityFactor;
 	object *GetFrameCBPtr;
 	object *callbackID;
 	clobject *new;

 	if (!getargs(args, "((iiiiiiiiii)iOO)",
 		     &compressionFormat.width,
 		     &compressionFormat.height,
 		     &compressionFormat.frameSize,
 		     &compressionFormat.dataMaxSize,
 		     &compressionFormat.originalFormat,
 		     &compressionFormat.components,
 		     &compressionFormat.bitsPerComponent,
 		     &compressionFormat.frameRate,
 		     &compressionFormat.numberOfFrames,
 		     &compressionFormat.compressionScheme,
 		     &qualityFactor, &GetFrameCBPtr, &callbackID))
 		return NULL;

 	new = NEWOBJ(clobject, &Cltype);
 	if (new == 0)
 		return NULL;

 	new->ob_compressorHdl = NULL;
 	new->ob_callbackFunc = NULL;
 	new->ob_callbackID = NULL;
 	new->ob_data = NULL;

 	error_handler_called = 0;
 	if (clOpenCompressor(&compressionFormat, qualityFactor, GetFrame,
 			     (void *) new, &new->ob_compressorHdl) == FAILURE) {
 		DECREF(new);
 		if (!error_handler_called)
 			err_setstr(ClError, "opencompressor failed");
 		return NULL;
 	}

 	new->ob_isCompressor = 1;
 	new->ob_callbackFunc = GetFrameCBPtr;
 	XINCREF(new->ob_callbackFunc);
 	if (callbackID == NULL)
 		callbackID = None;
 	new->ob_callbackID = callbackID;
 	INCREF(new->ob_callbackID);
 	new->ob_data = NULL;
 	new->ob_dataMaxSize = compressionFormat.dataMaxSize;
 	new->ob_frameSize = compressionFormat.frameSize;

 	return new;
 }

 static object *
 cl_OpenDecompressor(self, args)
 	object *self, *args;
 {
 	CL_CompressionFormat compressionFormat;
 	long infoSize;
 	void *info;
 	object *GetDataCBPtr;
 	object *callbackID;
 	clobject *new;
 	object *res;

 	if (!getargs(args, "((iiiiiiiiii)s#OO)",
 		     &compressionFormat.width,
 		     &compressionFormat.height,
 		     &compressionFormat.frameSize,
 		     &compressionFormat.dataMaxSize,
 		     &compressionFormat.originalFormat,
 		     &compressionFormat.components,
 		     &compressionFormat.bitsPerComponent,
 		     &compressionFormat.frameRate,
 		     &compressionFormat.numberOfFrames,
 		     &compressionFormat.compressionScheme,
 		     &info, &infoSize, &GetDataCBPtr, &callbackID))
 		return NULL;

 	new = NEWOBJ(clobject, &Cltype);
 	if (new == 0)
 		return NULL;

 	new->ob_compressorHdl = NULL;
 	new->ob_callbackFunc = NULL;
 	new->ob_callbackID = NULL;
 	new->ob_data = NULL;

 	error_handler_called = 0;
 	if (clOpenDecompressor(&compressionFormat, infoSize, info, GetData,
 			       (void *) new, &new->ob_compressorHdl) == FAILURE) {
 		new->ob_compressorHdl = NULL; /* just in case... */
 		DECREF(new);
 		if (!error_handler_called)
 			err_setstr(ClError, "opendecompressor failed");
 		return NULL;
 	}

 	new->ob_isCompressor = 0;
 	new->ob_callbackFunc = GetDataCBPtr;
 	XINCREF(new->ob_callbackFunc);
 	if (callbackID == NULL)
 		callbackID = None;
 	new->ob_callbackID = callbackID;
 	XINCREF(new->ob_callbackID);
 	new->ob_data = NULL;
 	new->ob_dataMaxSize = compressionFormat.dataMaxSize;
 	new->ob_frameSize = compressionFormat.frameSize;

 	return new;
 }

 static object *
 cl_AddParam(self, args)
 	object *self, *args;
 {
 	char *name;
 	long type, min, max, initial, paramID;

 	if (!getargs(args, "(siiii)", &name, &type, &min, &max, &initial))
 		return NULL;

 	error_handler_called = 0;
 	if (clAddParam(name, type, min, max, initial, &paramID) == FAILURE) {
 		if (!error_handler_called)
 			err_setstr(ClError, "addparam failed");
 		return NULL;
 	}

 	return newintobject(paramID);
 }

 static object *
 cl_QueryParams(self, args)
 	object *self, *args;
 {
 	long handle, *PVbuffer, bufferlength;
 	object *list;
 	int i;

 	if (!getargs(args, "i", &handle))
 		return NULL;

 	error_handler_called = 0;
 	bufferlength = clQueryParams((CL_CompressorHdl) handle, 0, 0);
 	if (error_handler_called)
 		return NULL;

 	PVbuffer = NEW(long, bufferlength);
 	if (PVbuffer == NULL)
 		return err_nomem();

 	bufferlength = clQueryParams((CL_CompressorHdl) handle, PVbuffer,
 				     bufferlength);
 	if (error_handler_called) {
 		DEL(PVbuffer);
 		return NULL;
 	}

 	list = newlistobject(bufferlength);
 	if (list == NULL) {
 		DEL(PVbuffer);
 		return NULL;
 	}

 	for (i = 0; i < bufferlength; i++) {
 		if (i & 1)
 			setlistitem(list, i, newintobject(PVbuffer[i]));
 		else
 			setlistitem(list, i, newstringobject((char *) PVbuffer[i]));
 	}

 	DEL(PVbuffer);

 	return list;
 }

 static struct methodlist cl_methods[] = {
 	{"AddParam",		cl_AddParam},
 	{"OpenCompressor",	cl_OpenCompressor},
 	{"OpenDecompressor",	cl_OpenDecompressor},
 	{"QueryParams",		cl_QueryParams},
 	{NULL,			NULL} /* Sentinel */
 };

 void
 initcl()
 {
 	object *m, *d;

 	m = initmodule("cl", cl_methods);
 	d = getmoduledict(m);

 	ClError = newstringobject("cl.error");
 	if (ClError == NULL || dictinsert(d, "error", ClError) != 0)
 		fatal("can't define cl.error");

 	(void) clSetErrorHandler(cl_ErrorHandler);
 }
	/***********************************************************
	Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The
	Netherlands.

	All Rights Reserved

	Permission to use, copy, modify, and distribute this software and its
	documentation for any purpose and without fee is hereby granted,
	provided that the above copyright notice appear in all copies and that
	both that copyright notice and this permission notice appear in
	supporting documentation, and that the names of Stichting Mathematisch
	Centrum or CWI not be used in advertising or publicity pertaining to
	distribution of the software without specific, written prior permission.

	STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
	THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
	FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
	FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
	OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

	******************************************************************/


	/* Cl objects */

	#include <stdarg.h>
	#include <cl.h>
	#include "allobjects.h"
	#include "modsupport.h" /* For getargs() etc. */
	#include "ceval.h" /* For call_object() */

	typedef struct {
	OB_HEAD
	int ob_isCompressor; /* Compressor or Decompressor */
	CL_CompressorHdl ob_compressorHdl;
	long ob_dataMaxSize;
	long ob_frameSize;
	object *ob_callbackFunc;
	object *ob_callbackID;
	object *ob_data;
	} clobject;

	#define CheckCompressor(self) if ((self)->ob_compressorHdl == NULL) { \
	err_setstr(RuntimeError, "(de)compressor not active"); \
	return NULL; \
	}

	extern typeobject Cltype; /* Really static, forward */

	#define is_clobject(v) ((v)->ob_type == &Cltype)

	static object ClError; / exception cl.error */

	static int error_handler_called = 0;

	static void
	cl_ErrorHandler(long errnum, const char *fmt, ...)
	{
	va_list ap;
	char errbuf[BUFSIZ]; /* hopefully big enough */
	char *p;

	if (err_occurred()) /* don't change existing error */
	return;
	error_handler_called = 1;
	va_start(ap, fmt);
	vsprintf(errbuf, fmt, ap);
	va_end(ap);
	p = &errbuf[strlen(errbuf) - 1]; /* swat the line feed */
	if (*p == '\n')
	*p = 0;
	err_setstr(ClError, errbuf);
	}

	static object *
	doClose(self, args, close_func)
	clobject *self;
	object *args;
	long (*close_func) PROTO((CL_CompressorHdl));
	{
	CheckCompressor(self);

	if (!getnoarg(args))
	return NULL;

	if ((*close_func)(self->ob_compressorHdl) == FAILURE) {
	if (!error_handler_called)
	err_setstr(ClError, "CloseCompressor failed");
	return NULL;
	}

	self->ob_compressorHdl = NULL;

	INCREF(None);
	return None;
	}

	static object *
	clm_CloseCompressor(self, args)
	clobject *self;
	object *args;
	{
	return doClose(self, args, clCloseCompressor);
	}

	static object *
	clm_CloseDecompressor(self, args)
	clobject *self;
	object *args;
	{
	return doClose(self, args, clCloseDecompressor);
	}

	static object *
	clm_Compress(self, args)
	clobject *self;
	object *args;
	{
	object *data;
	long frameIndex, numberOfFrames, dataSize;

	CheckCompressor(self);

	if (!getargs(args, "(ii)", &frameIndex, &numberOfFrames))
	return NULL;

	dataSize = self->ob_dataMaxSize;
	data = newsizedstringobject(NULL, dataSize);
	if (data == NULL)
	return NULL;

	error_handler_called = 0;
	if (clCompress(self->ob_compressorHdl, frameIndex, numberOfFrames,
	&dataSize, (void *) getstringvalue(data)) == FAILURE) {
	DECREF(data);
	if (!error_handler_called && !err_occurred())
	err_setstr(ClError, "compress failed");
	return NULL;
	}

	if (dataSize < self->ob_dataMaxSize)
	if (resizestring(&data, dataSize))
	return NULL;

	if (dataSize > self->ob_dataMaxSize) {
	/* we didn't get all data */
	DECREF(data);
	err_setstr(ClError, "buffer too small for compressed image");
	return NULL;
	}

	return data;
	}

	static object *
	clm_Decompress(self, args)
	clobject *self;
	object *args;
	{
	object *data;
	long frameIndex, numberOfFrames;

	CheckCompressor(self);

	if (!getargs(args, "(ii)", &frameIndex, &numberOfFrames))
	return NULL;

	data = newsizedstringobject(NULL,
	numberOfFrames * self->ob_frameSize);
	if (data == NULL)
	return NULL;

	error_handler_called = 0;
	if (clDecompress(self->ob_compressorHdl, frameIndex, numberOfFrames,
	(void *) getstringvalue(data)) == FAILURE) {
	DECREF(data);
	if (!error_handler_called && !err_occurred())
	err_setstr(ClError, "decompress failed");
	return NULL;
	}

	return data;
	}

	static object *
	clm_GetCompressorInfo(self, args)
	clobject *self;
	object *args;
	{
	long result, infoSize;
	void *info;
	object infoObject, res;

	CheckCompressor(self);

	if (!getnoarg(args))
	return NULL;

	error_handler_called = 0;
	if (clGetCompressorInfo(self->ob_compressorHdl, &infoSize, &info) == FAILURE) {
	if (!error_handler_called)
	err_setstr(ClError, "getcompressorinfo failed");
	return NULL;
	}

	return newsizedstringobject((char *) info, infoSize);
	}

	static object *
	clm_GetDefault(self, args)
	clobject *self;
	object *args;
	{
	long initial, result;

	CheckCompressor(self);

	if (!getargs(args, "i", &initial))
	return NULL;

	error_handler_called = 0;
	result = clGetDefault(self->ob_compressorHdl, initial);
	if (error_handler_called)
	return NULL;

	return newintobject(result);
	}

	static object *
	clm_GetMinMax(self, args)
	clobject *self;
	object *args;
	{
	long param, min, max;

	CheckCompressor(self);

	if (!getargs(args, "i", &param))
	return NULL;

	error_handler_called = 0;
	clGetMinMax(self->ob_compressorHdl, param, &min, &max);
	if (error_handler_called)
	return NULL;

	return mkvalue("(ii)", min, max);
	}

	static object *
	clm_GetName(self, args)
	clobject *self;
	object *args;
	{
	long descriptor;
	char *name;

	CheckCompressor(self);

	if (!getargs(args, "i", &descriptor))
	return NULL;

	error_handler_called = 0;
	name = clGetName(self->ob_compressorHdl, descriptor);
	if (error_handler_called)
	return NULL;
	if (name == NULL) {
	err_setstr(ClError, "getname failed");
	return NULL;
	}

	return newstringobject(name);
	}

	static object *
	doParams(self, args, func, modified)
	clobject *self;
	object *args;
	void (func)(CL_CompressorHdl, long , long);
	int modified;
	{
	object list, v;
	long *PVbuffer;
	long length;
	int i;

	CheckCompressor(self);

	if (!getargs(args, "O", &list))
	return NULL;
	if (!is_listobject(list)) {
	err_badarg();
	return NULL;
	}
	length = getlistsize(list);
	PVbuffer = NEW(long, length);
	if (PVbuffer == NULL)
	return err_nomem();
	for (i = 0; i < length; i++) {
	v = getlistitem(list, i);
	if (!is_intobject(v)) {
	DEL(PVbuffer);
	err_badarg();
	return NULL;
	}
	PVbuffer[i] = getintvalue(v);
	}

	error_handler_called = 0;
	(*func)(self->ob_compressorHdl, PVbuffer, length);
	if (error_handler_called)
	return NULL;

	if (modified) {
	for (i = 0; i < length; i++)
	setlistitem(list, i, newintobject(PVbuffer[i]));
	}

	DEL(PVbuffer);

	INCREF(None);
	return None;
	}

	static object *
	clm_GetParams(self, args)
	object self, args;
	{
	return doParams(self, args, clGetParams, 1);
	}

	static object *
	clm_SetParams(self, args)
	object self, args;
	{
	return doParams(self, args, clSetParams, 0);
	}

	static object *
	clm_QueryParams(self, args)
	clobject *self;
	object *args;
	{
	long bufferlength;
	long *PVbuffer;
	object *list;
	int i;

	CheckCompressor(self);

	if (!getnoarg(args))
	return NULL;

	error_handler_called = 0;
	bufferlength = clQueryParams(self->ob_compressorHdl, 0, 0);
	if (error_handler_called)
	return NULL;

	PVbuffer = NEW(long, bufferlength);
	if (PVbuffer == NULL)
	return err_nomem();

	bufferlength = clQueryParams(self->ob_compressorHdl, PVbuffer,
	bufferlength);
	if (error_handler_called) {
	DEL(PVbuffer);
	return NULL;
	}

	list = newlistobject(bufferlength);
	if (list == NULL) {
	DEL(PVbuffer);
	return NULL;
	}

	for (i = 0; i < bufferlength; i++) {
	if (i & 1)
	setlistitem(list, i, newintobject(PVbuffer[i]));
	else
	setlistitem(list, i, newstringobject((char *) PVbuffer[i]));
	}

	DEL(PVbuffer);

	return list;
	}

	static struct methodlist compressor_methods[] = {
	{"CloseCompressor", clm_CloseCompressor},
	{"Compress", clm_Compress},
	{"GetCompressorInfo", clm_GetCompressorInfo},
	{"GetDefault", clm_GetDefault},
	{"GetMinMax", clm_GetMinMax},
	{"GetName", clm_GetName},
	{"GetParams", clm_GetParams},
	{"QueryParams", clm_QueryParams},
	{"SetParams", clm_SetParams},
	{NULL, NULL} /* sentinel */
	};

	static struct methodlist decompressor_methods[] = {
	{"CloseDecompressor", clm_CloseDecompressor},
	{"Decompress", clm_Decompress},
	{"GetDefault", clm_GetDefault},
	{"GetMinMax", clm_GetMinMax},
	{"GetName", clm_GetName},
	{"GetParams", clm_GetParams},
	{"QueryParams", clm_QueryParams},
	{"SetParams", clm_SetParams},
	{NULL, NULL} /* sentinel */
	};

	static void
	cl_dealloc(self)
	clobject *self;
	{
	if (self->ob_compressorHdl) {
	if (self->ob_isCompressor)
	clCloseCompressor(self->ob_compressorHdl);
	else
	clCloseDecompressor(self->ob_compressorHdl);
	}
	XDECREF(self->ob_callbackFunc);
	XDECREF(self->ob_callbackID);
	XDECREF(self->ob_data);
	DEL(self);
	}

	static object *
	cl_getattr(self, name)
	clobject *self;
	char *name;
	{
	if (self->ob_isCompressor)
	return findmethod(compressor_methods, (object *)self, name);
	else
	return findmethod(decompressor_methods, (object *) self, name);
	}

	static typeobject Cltype = {
	OB_HEAD_INIT(&Typetype)
	0, /ob_size/
	"cl", /tp_name/
	sizeof(clobject), /tp_size/
	0, /tp_itemsize/
	/* methods */
	cl_dealloc, /tp_dealloc/
	0, /tp_print/
	cl_getattr, /tp_getattr/
	0, /tp_setattr/
	0, /tp_compare/
	0, /tp_repr/
	0, /tp_as_number/
	0, /tp_as_sequence/
	0, /tp_as_mapping/
	};

	static long
	GetFrame(callbackID, frameIndex, numberOfFrames, data)
	void *callbackID;
	long frameIndex;
	long numberOfFrames;
	void **data;
	{
	object *args;
	clobject self = (clobject ) callbackID;
	object *result;

	args = mkvalue("(Oii)", self->ob_callbackID, frameIndex,
	numberOfFrames);
	if (args == NULL)
	return FAILURE;

	result = call_object(self->ob_callbackFunc, args);
	DECREF(args);
	if (result == NULL)
	return FAILURE;

	if (!is_stringobject(result)) {
	DECREF(result);
	return FAILURE;
	}

	XDECREF(self->ob_data);
	self->ob_data = result;

	data = (void ) getstringvalue(result);

	return SUCCESS;
	}

	static long
	GetData(callbackID, frameIndex, numberOfFrames, dataSize, data)
	void *callbackID;
	long frameIndex;
	long numberOfFrames;
	long *dataSize;
	void **data;
	{
	object args, result;
	clobject self = (clobject ) callbackID;

	args = mkvalue("(Oii)", self->ob_callbackID, frameIndex,
	numberOfFrames);
	if (args == NULL)
	return FAILURE;

	result = call_object(self->ob_callbackFunc, args);
	DECREF(args);
	if (result == NULL)
	return FAILURE;

	if (!is_stringobject(result)) {
	DECREF(result);
	return FAILURE;
	}

	XDECREF(self->ob_data);
	self->ob_data = result;

	*dataSize = getstringsize(result);
	data = (void ) getstringvalue(result);

	return SUCCESS;
	}

	static object *
	cl_OpenCompressor(self, args)
	object self, args;
	{
	CL_CompressionFormat compressionFormat;
	long qualityFactor;
	object *GetFrameCBPtr;
	object *callbackID;
	clobject *new;

	if (!getargs(args, "((iiiiiiiiii)iOO)",
	&compressionFormat.width,
	&compressionFormat.height,
	&compressionFormat.frameSize,
	&compressionFormat.dataMaxSize,
	&compressionFormat.originalFormat,
	&compressionFormat.components,
	&compressionFormat.bitsPerComponent,
	&compressionFormat.frameRate,
	&compressionFormat.numberOfFrames,
	&compressionFormat.compressionScheme,
	&qualityFactor, &GetFrameCBPtr, &callbackID))
	return NULL;

	new = NEWOBJ(clobject, &Cltype);
	if (new == 0)
	return NULL;

	new->ob_compressorHdl = NULL;
	new->ob_callbackFunc = NULL;
	new->ob_callbackID = NULL;
	new->ob_data = NULL;

	error_handler_called = 0;
	if (clOpenCompressor(&compressionFormat, qualityFactor, GetFrame,
	(void *) new, &new->ob_compressorHdl) == FAILURE) {
	DECREF(new);
	if (!error_handler_called)
	err_setstr(ClError, "opencompressor failed");
	return NULL;
	}

	new->ob_isCompressor = 1;
	new->ob_callbackFunc = GetFrameCBPtr;
	XINCREF(new->ob_callbackFunc);
	if (callbackID == NULL)
	callbackID = None;
	new->ob_callbackID = callbackID;
	INCREF(new->ob_callbackID);
	new->ob_data = NULL;
	new->ob_dataMaxSize = compressionFormat.dataMaxSize;
	new->ob_frameSize = compressionFormat.frameSize;

	return new;
	}

	static object *
	cl_OpenDecompressor(self, args)
	object self, args;
	{
	CL_CompressionFormat compressionFormat;
	long infoSize;
	void *info;
	object *GetDataCBPtr;
	object *callbackID;
	clobject *new;
	object *res;

	if (!getargs(args, "((iiiiiiiiii)s#OO)",
	&compressionFormat.width,
	&compressionFormat.height,
	&compressionFormat.frameSize,
	&compressionFormat.dataMaxSize,
	&compressionFormat.originalFormat,
	&compressionFormat.components,
	&compressionFormat.bitsPerComponent,
	&compressionFormat.frameRate,
	&compressionFormat.numberOfFrames,
	&compressionFormat.compressionScheme,
	&info, &infoSize, &GetDataCBPtr, &callbackID))
	return NULL;

	new = NEWOBJ(clobject, &Cltype);
	if (new == 0)
	return NULL;

	new->ob_compressorHdl = NULL;
	new->ob_callbackFunc = NULL;
	new->ob_callbackID = NULL;
	new->ob_data = NULL;

	error_handler_called = 0;
	if (clOpenDecompressor(&compressionFormat, infoSize, info, GetData,
	(void *) new, &new->ob_compressorHdl) == FAILURE) {
	new->ob_compressorHdl = NULL; /* just in case... */
	DECREF(new);
	if (!error_handler_called)
	err_setstr(ClError, "opendecompressor failed");
	return NULL;
	}

	new->ob_isCompressor = 0;
	new->ob_callbackFunc = GetDataCBPtr;
	XINCREF(new->ob_callbackFunc);
	if (callbackID == NULL)
	callbackID = None;
	new->ob_callbackID = callbackID;
	XINCREF(new->ob_callbackID);
	new->ob_data = NULL;
	new->ob_dataMaxSize = compressionFormat.dataMaxSize;
	new->ob_frameSize = compressionFormat.frameSize;

	return new;
	}

	static object *
	cl_AddParam(self, args)
	object self, args;
	{
	char *name;
	long type, min, max, initial, paramID;

	if (!getargs(args, "(siiii)", &name, &type, &min, &max, &initial))
	return NULL;

	error_handler_called = 0;
	if (clAddParam(name, type, min, max, initial, &paramID) == FAILURE) {
	if (!error_handler_called)
	err_setstr(ClError, "addparam failed");
	return NULL;
	}

	return newintobject(paramID);
	}

	static object *
	cl_QueryParams(self, args)
	object self, args;
	{
	long handle, *PVbuffer, bufferlength;
	object *list;
	int i;

	if (!getargs(args, "i", &handle))
	return NULL;

	error_handler_called = 0;
	bufferlength = clQueryParams((CL_CompressorHdl) handle, 0, 0);
	if (error_handler_called)
	return NULL;

	PVbuffer = NEW(long, bufferlength);
	if (PVbuffer == NULL)
	return err_nomem();

	bufferlength = clQueryParams((CL_CompressorHdl) handle, PVbuffer,
	bufferlength);
	if (error_handler_called) {
	DEL(PVbuffer);
	return NULL;
	}

	list = newlistobject(bufferlength);
	if (list == NULL) {
	DEL(PVbuffer);
	return NULL;
	}

	for (i = 0; i < bufferlength; i++) {
	if (i & 1)
	setlistitem(list, i, newintobject(PVbuffer[i]));
	else
	setlistitem(list, i, newstringobject((char *) PVbuffer[i]));
	}

	DEL(PVbuffer);

	return list;
	}

	static struct methodlist cl_methods[] = {
	{"AddParam", cl_AddParam},
	{"OpenCompressor", cl_OpenCompressor},
	{"OpenDecompressor", cl_OpenDecompressor},
	{"QueryParams", cl_QueryParams},
	{NULL, NULL} /* Sentinel */
	};

	void
	initcl()
	{
	object m, d;

	m = initmodule("cl", cl_methods);
	d = getmoduledict(m);

	ClError = newstringobject("cl.error");
	if (ClError == NULL \|\| dictinsert(d, "error", ClError) != 0)
	fatal("can't define cl.error");

	(void) clSetErrorHandler(cl_ErrorHandler);
	}