NDFileNexus.h

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/*
 * NDFileTIFF.h
 * Writes NDArrays to NeXus (HDF) files.
 * John Hammonds
 * April 17, 2009
 */
 
#ifndef DRV_NDFileNexus_H
#define DRV_NDFileNexus_H
 
#include "NDPluginFile.h"
#include <napi.h>
#include <libxml/parser.h>
 
/* This version number is an attribute in the Nexus file to allow readers
 * to handle changes in the file contents */
#define NDNexusFileVersion 1.0
 
 
#define NDFileNexusTemplatePathString "TEMPLATE_FILE_PATH"
#define NDFileNexusTemplateFileString "TEMPLATE_FILE_NAME"
#define NDFileNexusTemplateValidString "TEMPLATE_FILE_VALID"
#define NUM_ND_FILE_NEXUS_PARAMS (sizeof(NDFileNexusParamString)/sizeof(NDFileNexusParamString[0]))
 
class NDPLUGIN_API NDFileNexus : public NDPluginFile {
public:
    NDFileNexus(const char *portName, int queueSize, int blockingCallbacks,
                 const char *NDArrayPort, int NDArrayAddr,
                 int priority, int stackSize);
 
    /* The methods that this class implements */
    virtual asynStatus openFile(const char *fileName, NDFileOpenMode_t openMode, NDArray *pArray);
    virtual asynStatus readFile(NDArray **pArray);
    virtual asynStatus writeFile(NDArray *pArray);
    virtual asynStatus closeFile();
    asynStatus writeOctet(asynUser *pasynUser, const char *value,
                                    size_t nChars, size_t *nActual);
protected:
    int NDFileNexusTemplatePath;
    #define FIRST_NDFILE_NEXUS_PARAM NDFileNexusTemplatePath
    int NDFileNexusTemplateFile;
    int NDFileNexusTemplateValid;
 
private:
    NXhandle nxFileHandle;
    xmlDoc *configDoc;
    xmlNodePtr rootNode;
    NDAttributeList *pFileAttributes;
    NXname dataPath;
    NXname dataName;
    int imageNumber;
 
    int processNode(xmlNode *curNode, NDArray *);
    int processStreamData(NDArray *);
    void getAttrTypeNSize(NDAttribute *pAttr, int *retType, int *retSize);
    void iterateNodes(xmlNode *curNode, NDArray *pArray);
    void findConstText(xmlNode *curNode, char *outtext);
    void * allocConstValue(int dataType, size_t length);
    void constTextToDataType(char *inText, int dataType, void *pValue);
    int typeStringToVal( const char * typeStr );
    void loadTemplateFile();
 
};
 
#endif