/*
 * npunix.c
 *
 * Netscape Client Plugin API
 * - Wrapper function to interface with the Netscape Navigator
 *
 * dp Suresh <dp@netscape.com>
 *
 *----------------------------------------------------------------------
 * PLUGIN DEVELOPERS:
 *	YOU WILL NOT NEED TO EDIT THIS FILE.
 *----------------------------------------------------------------------
 */

#define XP_UNIX 1

#include <stdio.h>
#include "npapi.h"
#include "npupp.h"

/*
 * Define PLUGIN_TRACE to have the wrapper functions print
 * messages to stderr whenever they are called.
 */

#ifdef PLUGIN_TRACE
#include <stdio.h>
#define PLUGINDEBUGSTR(msg)	fprintf(stderr, "%s\n", msg)
#else
#define PLUGINDEBUGSTR(msg)
#endif


/***********************************************************************
 *
 * Globals
 *
 ***********************************************************************/

static NPNetscapeFuncs gNetscapeFuncs;	/* Netscape Function table */


/***********************************************************************
 *
 * Wrapper functions : plugin calling Netscape Navigator
 *
 * These functions let the plugin developer just call the APIs
 * as documented and defined in npapi.h, without needing to know
 * about the function table and call macros in npupp.h.
 *
 ***********************************************************************/

void
NPN_Version(int *plugin_major, int *plugin_minor,
	    int *netscape_major, int *netscape_minor)
{
    *plugin_major = NP_VERSION_MAJOR;
    *plugin_minor = NP_VERSION_MINOR;

    /* Major version is in high byte */
    *netscape_major = gNetscapeFuncs.version >> 8;
    /* Minor version is in low byte */
    *netscape_minor = gNetscapeFuncs.version & 0xFF;
}

NPError NPN_GetValue(NPP instance, NPNVariable variable, void *r_value)
{
    return CallNPN_GetValueProc(gNetscapeFuncs.getvalue,
				instance, variable, r_value);
}

NPError NPN_GetURL(NPP instance, const char *url, const char *window)
{
    return CallNPN_GetURLProc(gNetscapeFuncs.geturl, instance, url,
			      window);
}

NPError
NPN_PostURL(NPP instance, const char *url, const char *window,
	    uint32 len, const char *buf, NPBool file)
{
    return CallNPN_PostURLProc(gNetscapeFuncs.posturl, instance,
			       url, window, len, buf, file);
}

NPError NPN_RequestRead(NPStream * stream, NPByteRange * rangeList)
{
    return CallNPN_RequestReadProc(gNetscapeFuncs.requestread,
				   stream, rangeList);
}

NPError
NPN_NewStream(NPP instance, NPMIMEType type, const char *window,
	      NPStream ** stream_ptr)
{
    return CallNPN_NewStreamProc(gNetscapeFuncs.newstream, instance,
				 type, window, stream_ptr);
}

int32 NPN_Write(NPP instance, NPStream * stream, int32 len, void *buffer)
{
    return CallNPN_WriteProc(gNetscapeFuncs.write, instance,
			     stream, len, buffer);
}

NPError NPN_DestroyStream(NPP instance, NPStream * stream, NPError reason)
{
    return CallNPN_DestroyStreamProc(gNetscapeFuncs.destroystream,
				     instance, stream, reason);
}

void NPN_Status(NPP instance, const char *message)
{
    CallNPN_StatusProc(gNetscapeFuncs.status, instance, message);
}

const char *NPN_UserAgent(NPP instance)
{
    return CallNPN_UserAgentProc(gNetscapeFuncs.uagent, instance);
}

void *NPN_MemAlloc(uint32 size)
{
    return CallNPN_MemAllocProc(gNetscapeFuncs.memalloc, size);
}

void NPN_MemFree(void *ptr)
{
    CallNPN_MemFreeProc(gNetscapeFuncs.memfree, ptr);
}

uint32 NPN_MemFlush(uint32 size)
{
    return CallNPN_MemFlushProc(gNetscapeFuncs.memflush, size);
}

void NPN_ReloadPlugins(NPBool reloadPages)
{
    CallNPN_ReloadPluginsProc(gNetscapeFuncs.reloadplugins, reloadPages);
}

JRIEnv *NPN_GetJavaEnv()
{
    return CallNPN_GetJavaEnvProc(gNetscapeFuncs.getJavaEnv);
}

jref NPN_GetJavaPeer(NPP instance)
{
    return CallNPN_GetJavaPeerProc(gNetscapeFuncs.getJavaPeer, instance);
}


/***********************************************************************
 *
 * Wrapper functions : Netscape Navigator -> plugin
 *
 * These functions let the plugin developer just create the APIs
 * as documented and defined in npapi.h, without needing to 
 * install those functions in the function table or worry about
 * setting up globals for 68K plugins.
 *
 ***********************************************************************/

NPError
Private_New(NPMIMEType pluginType, NPP instance, uint16 mode,
	    int16 argc, char *argn[], char *argv[], NPSavedData * saved)
{
    NPError ret;
    PLUGINDEBUGSTR("New");
    ret = NPP_New(pluginType, instance, mode, argc, argn, argv, saved);
    return ret;
}

NPError Private_Destroy(NPP instance, NPSavedData ** save)
{
    PLUGINDEBUGSTR("Destroy");
    return NPP_Destroy(instance, save);
}

NPError Private_SetWindow(NPP instance, NPWindow * window)
{
    NPError err;
    PLUGINDEBUGSTR("SetWindow");
    err = NPP_SetWindow(instance, window);
    return err;
}

NPError
Private_NewStream(NPP instance, NPMIMEType type, NPStream * stream,
		  NPBool seekable, uint16 * stype)
{
    NPError err;
    PLUGINDEBUGSTR("NewStream");
    err = NPP_NewStream(instance, type, stream, seekable, stype);
    return err;
}

int32 Private_WriteReady(NPP instance, NPStream * stream)
{
    unsigned int result;
    PLUGINDEBUGSTR("WriteReady");
    result = NPP_WriteReady(instance, stream);
    return result;
}

int32
Private_Write(NPP instance, NPStream * stream, int32 offset, int32 len,
	      void *buffer)
{
    unsigned int result;
    PLUGINDEBUGSTR("Write");
    result = NPP_Write(instance, stream, offset, len, buffer);
    return result;
}

void
Private_StreamAsFile(NPP instance, NPStream * stream, const char *fname)
{
    PLUGINDEBUGSTR("StreamAsFile");
    NPP_StreamAsFile(instance, stream, fname);
}


NPError
Private_DestroyStream(NPP instance, NPStream * stream, NPError reason)
{
    NPError err;
    PLUGINDEBUGSTR("DestroyStream");
    err = NPP_DestroyStream(instance, stream, reason);
    return err;
}


void Private_Print(NPP instance, NPPrint * platformPrint)
{
    PLUGINDEBUGSTR("Print");
    NPP_Print(instance, platformPrint);
}

JRIGlobalRef Private_GetJavaClass(void)
{
    jref clazz = NPP_GetJavaClass();
    if (clazz) {
	JRIEnv *env = NPN_GetJavaEnv();
	return JRI_NewGlobalRef(env, clazz);
    }
    return NULL;
}

/*********************************************************************** 
 *
 * These functions are located automagically by netscape.
 *
 ***********************************************************************/

/*
 * NP_GetMIMEDescription
 *	- Netscape needs to know about this symbol
 *	- Netscape uses the return value to identify when an object instance
 *	  of this plugin should be created.
 */
char *NP_GetMIMEDescription(void)
{
    return NPP_GetMIMEDescription();
}

/*
 * NP_GetValue [optional]
 *	- Netscape needs to know about this symbol.
 *	- Interfaces with plugin to get values for predefined variables
 *	  that the navigator needs.
 */
NPError NP_GetValue(void *future, NPPVariable variable, void *value)
{
    return NPP_GetValue(future, variable, value);
}

/*
 * NP_Initialize
 *	- Netscape needs to know about this symbol.
 *	- It calls this function after looking up its symbol before it
 *	  is about to create the first ever object of this kind.
 *
 * PARAMETERS
 *    nsTable	- The netscape function table. If developers just use these
 *		  wrappers, they dont need to worry about all these function
 *		  tables.
 * RETURN
 *    pluginFuncs
 *		- This functions needs to fill the plugin function table
 *		  pluginFuncs and return it. Netscape Navigator plugin
 *		  library will use this function table to call the plugin.
 *
 */
NPError
NP_Initialize(NPNetscapeFuncs * nsTable, NPPluginFuncs * pluginFuncs)
{
    NPError err = NPERR_NO_ERROR;

    PLUGINDEBUGSTR("NP_Initialize");

    /* validate input parameters */

    if ((nsTable == NULL) || (pluginFuncs == NULL))
	err = NPERR_INVALID_FUNCTABLE_ERROR;

    /*
     * Check the major version passed in Netscape's function table.
     * We won't load if the major version is newer than what we expect.
     * Also check that the function tables passed in are big enough for
     * all the functions we need (they could be bigger, if Netscape added
     * new APIs, but that's OK with us -- we'll just ignore them).
     *
     */

    if (err == NPERR_NO_ERROR) {
	if ((nsTable->version >> 8) > NP_VERSION_MAJOR)
	    err = NPERR_INCOMPATIBLE_VERSION_ERROR;
	if (nsTable->size < sizeof(NPNetscapeFuncs))
	    err = NPERR_INVALID_FUNCTABLE_ERROR;
	if (pluginFuncs->size < sizeof(NPPluginFuncs))
	    err = NPERR_INVALID_FUNCTABLE_ERROR;
    }


    if (err == NPERR_NO_ERROR) {
	/*
	 * Copy all the fields of Netscape function table into our
	 * copy so we can call back into Netscape later.  Note that
	 * we need to copy the fields one by one, rather than assigning
	 * the whole structure, because the Netscape function table
	 * could actually be bigger than what we expect.
	 */
	gNetscapeFuncs.version = nsTable->version;
	gNetscapeFuncs.size = nsTable->size;
	gNetscapeFuncs.posturl = nsTable->posturl;
	gNetscapeFuncs.geturl = nsTable->geturl;
	gNetscapeFuncs.requestread = nsTable->requestread;
	gNetscapeFuncs.newstream = nsTable->newstream;
	gNetscapeFuncs.write = nsTable->write;
	gNetscapeFuncs.destroystream = nsTable->destroystream;
	gNetscapeFuncs.status = nsTable->status;
	gNetscapeFuncs.uagent = nsTable->uagent;
	gNetscapeFuncs.memalloc = nsTable->memalloc;
	gNetscapeFuncs.memfree = nsTable->memfree;
	gNetscapeFuncs.memflush = nsTable->memflush;
	gNetscapeFuncs.reloadplugins = nsTable->reloadplugins;
	gNetscapeFuncs.getJavaEnv = nsTable->getJavaEnv;
	gNetscapeFuncs.getJavaPeer = nsTable->getJavaPeer;
	gNetscapeFuncs.getvalue = nsTable->getvalue;

	/*
	 * Set up the plugin function table that Netscape will use to
	 * call us.  Netscape needs to know about our version and size
	 * and have a UniversalProcPointer for every function we
	 * implement.
	 */
	pluginFuncs->version = (NP_VERSION_MAJOR << 8) + NP_VERSION_MINOR;
	pluginFuncs->size = sizeof(NPPluginFuncs);
	pluginFuncs->newp = NewNPP_NewProc(Private_New);
	pluginFuncs->destroy = NewNPP_DestroyProc(Private_Destroy);
	pluginFuncs->setwindow = NewNPP_SetWindowProc(Private_SetWindow);
	pluginFuncs->newstream = NewNPP_NewStreamProc(Private_NewStream);
	pluginFuncs->destroystream =
	    NewNPP_DestroyStreamProc(Private_DestroyStream);
	pluginFuncs->asfile =
	    NewNPP_StreamAsFileProc(Private_StreamAsFile);
	pluginFuncs->writeready =
	    NewNPP_WriteReadyProc(Private_WriteReady);
	pluginFuncs->write = NewNPP_WriteProc(Private_Write);
	pluginFuncs->print = NewNPP_PrintProc(Private_Print);
	pluginFuncs->event = NULL;
	pluginFuncs->javaClass = Private_GetJavaClass();

	err = NPP_Initialize();
    }

    return err;
}

/*
 * NP_Shutdown [optional]
 *	- Netscape needs to know about this symbol.
 *	- It calls this function after looking up its symbol after
 *	  the last object of this kind has been destroyed.
 *
 */
NPError NP_Shutdown(void)
{
    PLUGINDEBUGSTR("NP_Shutdown");
    NPP_Shutdown();
    return NPERR_NO_ERROR;
}
