HID_CFM.c

/*
    File:       HID_CFM.c
 
    Contains:   Implementation of the CFM interfaces to the HID Utilities bundle
    
    DRI: George Warner
 
    Copyright:  Copyright © 2002 Apple Computer, Inc., All Rights Reserved
 
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 */
 
//includes
 
#include "HID_Utilities_CFM.h"
 
// ==================================
 
// types
 
typedef unsigned char (*fpHIDBuildDeviceListtype) (unsigned long usagePage, unsigned long usage);
typedef void (*fpHIDReleaseDeviceListtype) (void);
typedef unsigned char (*fpHIDHaveDeviceListtype) (void);
typedef unsigned long (*fpHIDCountDevicestype) (void);
typedef unsigned long (*fpHIDCountDeviceElementstype) (pRecDevice pDevice, HIDElementTypeMask typeMask);
typedef pRecDevice (*fpHIDGetFirstDevicetype) (void);
typedef pRecDevice (*fpHIDGetNextDevicetype) (pRecDevice pDevice);
typedef pRecElement (*fpHIDGetFirstDeviceElementtype) (pRecDevice pDevice, HIDElementTypeMask typeMask);
typedef pRecElement (*fpHIDGetNextDeviceElementtype) (pRecElement pElement, HIDElementTypeMask typeMask);
typedef pRecElement (*fpHIDGetPreviousDeviceElementtype) (pRecElement pElement, HIDElementTypeMask typeMask);
typedef void (*fpHIDGetTypeNametype) (unsigned long type, char * cstrName);
typedef void (*fpHIDGetUsageNametype) (long valueUsagePage, long valueUsage, char * cstrName);
typedef unsigned long  (*fpHIDQueueElementtype) (pRecDevice pDevice, pRecElement pElement);
typedef unsigned long  (*fpHIDQueueDevicetype) (pRecDevice pDevice);
typedef unsigned long  (*fpHIDDequeueElementtype) (pRecDevice pDevice, pRecElement pElement);
typedef unsigned long  (*fpHIDDequeueDevicetype) (pRecDevice pDevice);
typedef unsigned char (*fpHIDGetEventtype) (pRecDevice pDevice, void * pHIDEvent);
typedef long (*fpHIDGetElementValuetype) (pRecDevice pDevice, pRecElement pElement);
typedef long (*fpHIDCalibrateValuetype) (long value, pRecElement pElement);
typedef long (*fpHIDScaleValuetype) (long value, pRecElement pElement);
typedef unsigned char (*fpHIDConfigureActiontype) (pRecDevice * ppDevice, pRecElement * ppElement, float timeout);
typedef void (*fpHIDSaveElementConfigtype) (FILE * fileRef, pRecDevice pDevice, pRecElement pElement, long actionCookie);
typedef long (*fpHIDRestoreElementConfigtype) (FILE * fileRef, pRecDevice * ppDevice, pRecElement * ppElement);
 
// function pointers
fpHIDBuildDeviceListtype fpHIDBuildDeviceList = NULL;
fpHIDReleaseDeviceListtype fpHIDReleaseDeviceList = NULL;
fpHIDHaveDeviceListtype fpHIDHaveDeviceList = NULL;
fpHIDCountDevicestype fpHIDCountDevices = NULL;
fpHIDCountDeviceElementstype fpHIDCountDeviceElements = NULL;
fpHIDGetFirstDevicetype fpHIDGetFirstDevice = NULL;
fpHIDGetNextDevicetype fpHIDGetNextDevice = NULL;
fpHIDGetFirstDeviceElementtype fpHIDGetFirstDeviceElement = NULL;
fpHIDGetNextDeviceElementtype fpHIDGetNextDeviceElement = NULL;
fpHIDGetPreviousDeviceElementtype fpHIDGetPreviousDeviceElement = NULL;
fpHIDGetTypeNametype fpHIDGetTypeName = NULL;
fpHIDGetUsageNametype fpHIDGetUsageName = NULL;
fpHIDQueueElementtype fpHIDQueueElement = NULL;
fpHIDQueueDevicetype fpHIDQueueDevice = NULL;
fpHIDDequeueElementtype fpHIDDequeueElement = NULL;
fpHIDDequeueDevicetype fpHIDDequeueDevice = NULL;
fpHIDGetEventtype fpHIDGetEvent = NULL;
fpHIDGetElementValuetype fpHIDGetElementValue = NULL;
fpHIDCalibrateValuetype fpHIDCalibrateValue = NULL;
fpHIDScaleValuetype fpHIDScaleValue = NULL;
fpHIDConfigureActiontype fpHIDConfigureAction = NULL;
fpHIDSaveElementConfigtype fpHIDSaveElementConfig = NULL;
fpHIDRestoreElementConfigtype fpHIDRestoreElementConfig = NULL;
 
//globals
 
CFURLRef gBundleURL = NULL;
CFBundleRef gBundle = NULL;
 
// ==================================
 
OSStatus SetupHIDCFM (void)
{
    Boolean didLoad = false; // Flag that indicates the status returned when attempting to load a bundle's executable code.
    CFBundleRef refMainBundle = NULL;
    CFURLRef refMainBundleURL = NULL, refPathBundleURL = NULL; 
 
    //  See the Core Foundation URL Services chapter for details.
    // get app bundle (even for a CFM app!)
    refMainBundle = CFBundleGetMainBundle(); 
    if (!refMainBundle)
    {
        DebugStr ("\pCould open main bundle");
        return paramErr;
    }
    // create a URL to the app bundle
    refMainBundleURL = CFBundleCopyBundleURL (refMainBundle); 
    if (!refMainBundleURL)
    {
        DebugStr ("\pCould not copy main bundle URL");
        return paramErr;
    }
    // create a URL that points to the app's directory
    refPathBundleURL = CFURLCreateCopyDeletingLastPathComponent (NULL, refMainBundleURL); 
    if (!refPathBundleURL)
    {
        DebugStr ("\pCould not create new parent URL deleting last path component");
        if (refMainBundleURL != NULL) 
            CFRelease (refMainBundleURL);
        return paramErr;
    }
    // create a URL to the HID library bundle
    gBundleURL = CFURLCreateCopyAppendingPathComponent (NULL, refPathBundleURL, CFSTR("HID.bundle"), true); 
    // release created URLs
    if (refMainBundleURL != NULL) 
        CFRelease (refMainBundleURL);
    if (refPathBundleURL != NULL) 
        CFRelease (refPathBundleURL);
    // did we actaully get a bundle URL
    if (!gBundleURL)
    {
        DebugStr ("\pCould create HID bundle URL");
        return paramErr;
    }
    // get the actual bundle for the HID library
    gBundle = CFBundleCreate (NULL, gBundleURL);
    if (!gBundle)
    {
        DebugStr ("\pCould not create HID MachO library bundle");
        return paramErr;
    }
    if (!CFBundleLoadExecutable (gBundle)) // If the code was successfully loaded, look for our function.
    {
        DebugStr ("\pCould not load MachO executable");
        return paramErr;
    }
    // Now that the code is loaded, search for the function we want by name.
    fpHIDBuildDeviceList = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDBuildDeviceList"));
    fpHIDReleaseDeviceList = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDReleaseDeviceList"));
    fpHIDHaveDeviceList = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDHaveDeviceList"));
    fpHIDCountDevices = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDCountDevices"));
    fpHIDCountDeviceElements = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDCountDeviceElements"));
    fpHIDGetFirstDevice = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDGetFirstDevice"));
    fpHIDGetNextDevice = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDGetNextDevice"));
    fpHIDGetFirstDeviceElement = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDGetFirstDeviceElement"));
    fpHIDGetNextDeviceElement = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDGetNextDeviceElement"));
    fpHIDGetPreviousDeviceElement = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDGetPreviousDeviceElement"));
    fpHIDGetTypeName = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDGetTypeName"));
    fpHIDGetUsageName = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDGetUsageName"));
    fpHIDQueueElement = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDQueueElement"));
    fpHIDQueueDevice = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDQueueDevice"));
    fpHIDDequeueElement = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDDequeueElement"));
    fpHIDDequeueDevice = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDDequeueDevice"));
    fpHIDGetEvent = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDGetEvent"));
    fpHIDGetElementValue = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDGetElementValue"));
    fpHIDCalibrateValue = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDCalibrateValue"));
    fpHIDScaleValue = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDScaleValue"));
    fpHIDConfigureAction = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDConfigureAction"));
    fpHIDSaveElementConfig = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDSaveElementConfig"));
    fpHIDRestoreElementConfig = (void *) CFBundleGetFunctionPointerForName (gBundle, CFSTR("HIDRestoreElementConfig"));
    return noErr;
}
 
void TearDownHIDCFM (void)
{
    // disassociate function pointers
    fpHIDBuildDeviceList = NULL;
    fpHIDReleaseDeviceList = NULL;
    fpHIDHaveDeviceList = NULL;
    fpHIDCountDevices = NULL;
    fpHIDCountDeviceElements = NULL;
    fpHIDGetFirstDevice = NULL;
    fpHIDGetNextDevice = NULL;
    fpHIDGetFirstDeviceElement = NULL;
    fpHIDGetNextDeviceElement = NULL;
    fpHIDGetPreviousDeviceElement = NULL;
    fpHIDGetTypeName = NULL;
    fpHIDGetUsageName = NULL;
    fpHIDQueueElement = NULL;
    fpHIDQueueDevice = NULL;
    fpHIDDequeueElement = NULL;
    fpHIDDequeueDevice = NULL;
    fpHIDGetEvent = NULL;
    fpHIDGetElementValue = NULL;
    fpHIDCalibrateValue = NULL;
    fpHIDScaleValue = NULL;
    fpHIDConfigureAction = NULL;
    fpHIDSaveElementConfig = NULL;
    fpHIDRestoreElementConfig = NULL;
    if (gBundle != NULL)
    {
        CFBundleUnloadExecutable (gBundle);         //  Unload the bundle's executable code. 
        if (gBundleURL != NULL) 
            CFRelease (gBundleURL);
        CFRelease (gBundle);
    }
}
 
unsigned char HIDBuildDeviceList (unsigned long usagePage, unsigned long usage)
{
    return (*fpHIDBuildDeviceList) (usagePage, usage);
}
 
void HIDReleaseDeviceList (void)
{
    (*fpHIDReleaseDeviceList) ();
}
 
unsigned char HIDHaveDeviceList (void)
{
    return (*fpHIDHaveDeviceList) ();
}
 
unsigned long HIDCountDevices (void)
{
    return (*fpHIDCountDevices) ();
}
 
unsigned long HIDCountDeviceElements (pRecDevice pDevice, HIDElementTypeMask typeMask)
{
    return (*fpHIDCountDeviceElements) (pDevice, typeMask);
}
 
pRecDevice HIDGetFirstDevice (void)
{
    return (*fpHIDGetFirstDevice) ();
}
 
pRecDevice HIDGetNextDevice (pRecDevice pDevice)
{
    return (*fpHIDGetNextDevice) (pDevice);
}
 
pRecElement HIDGetFirstDeviceElement (pRecDevice pDevice, HIDElementTypeMask typeMask)
{
    return (*fpHIDGetFirstDeviceElement) (pDevice, typeMask);
}
 
pRecElement HIDGetNextDeviceElement (pRecElement pElement, HIDElementTypeMask typeMask)
{
    return (*fpHIDGetNextDeviceElement) (pElement, typeMask);
}
 
pRecElement HIDGetPreviousDeviceElement (pRecElement pElement, HIDElementTypeMask typeMask)
{
    return (*fpHIDGetPreviousDeviceElement) (pElement, typeMask);
}
 
void HIDGetTypeName (unsigned long type, char * cstrName)
{
    (*fpHIDGetTypeName) (type, cstrName);
}
 
void HIDGetUsageName (long valueUsagePage, long valueUsage, char * cstrName)
{
    (*fpHIDGetUsageName) (valueUsagePage, valueUsage, cstrName);
}
 
// ==================================
 
// Element Event Queue and Value Interfaces
 
unsigned long  HIDQueueElement (pRecDevice pDevice, pRecElement pElement)
{
    return (*fpHIDQueueElement) (pDevice, pElement);
}
 
unsigned long  HIDQueueDevice (pRecDevice pDevice)
{
    return (*fpHIDQueueDevice) (pDevice);
}
 
unsigned long  HIDDequeueElement (pRecDevice pDevice, pRecElement pElement)
{
    return (*fpHIDDequeueElement) (pDevice, pElement);
}
 
unsigned long  HIDDequeueDevice (pRecDevice pDevice)
{
    return (*fpHIDDequeueDevice) (pDevice);
}
 
unsigned char HIDGetEvent (pRecDevice pDevice, void * pHIDEvent)
{
    return (*fpHIDGetEvent) (pDevice, pHIDEvent);
}
 
long HIDGetElementValue (pRecDevice pDevice, pRecElement pElement)
{
    return (*fpHIDGetElementValue) (pDevice, pElement);
}
 
long HIDCalibrateValue (long value, pRecElement pElement)
{
    return (*fpHIDCalibrateValue) (value, pElement);
}
 
long HIDScaleValue (long value, pRecElement pElement)
{
    return (*fpHIDScaleValue) (value, pElement);
}
 
// ==================================
 
// Conguration and Save Interfaces
 
unsigned char HIDConfigureAction (pRecDevice * ppDevice, pRecElement * ppElement, float timeout)
{
    return (*fpHIDConfigureAction) (ppDevice, ppElement, timeout);
}
 
void HIDSaveElementConfig (FILE * fileRef, pRecDevice pDevice, pRecElement pElement, long actionCookie)
{
    (*fpHIDSaveElementConfig) (fileRef, pDevice, pElement, actionCookie);
}
 
long HIDRestoreElementConfig (FILE * fileRef, pRecDevice * ppDevice, pRecElement * ppElement)
{
    return (*fpHIDRestoreElementConfig) (fileRef, ppDevice, ppElement);
}