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npunix.c

/*
 * 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.
 */

/* #define PLUGIN_TRACE */
#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);
}


/***********************************************************************
 *
 * 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);
}

/*********************************************************************** 
 *
 * 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  = NULL;

            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;
}

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