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/* xmlj_io.c -

   Copyright (C) 2003, 2004 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

#include "xmlj_io.h"

#include "xmlj_error.h"

#include "xmlj_node.h"

#include "xmlj_sax.h"

#include "xmlj_util.h"

#include <math.h>

#include <string.h>

#include <stdio.h>

#include <stdarg.h>

#include <libxml/xmlIO.h>

#include <libxml/parserInternals.h>

#include <pthread.h>

#define MIN(a, b) (((a) < (b)) ? (a) : (b))

#define UNSIGN(a) (((a) < 0) ? ((a) + 0x100) : (a))

#define DETECT_BUFFER_SIZE 50

typedef struct _OutputStreamContext

{

  JNIEnv *env;

  jobject outputStream;

  jmethodID outputStreamWriteFunc;

  jmethodID outputStreamCloseFunc;

}

OutputStreamContext;

typedef struct _InputStreamContext

{

  JNIEnv *env;

  jobject inputStream;

  jmethodID inputStreamReadFunc;

  jmethodID inputStreamCloseFunc;

  jobject bufferByteArray;

  jint bufferLength;

}

InputStreamContext;

InputStreamContext *xmljNewInputStreamContext (JNIEnv * env,

                                               jobject inputStream);

void xmljFreeInputStreamContext (InputStreamContext * inContext);

int xmljInputReadCallback (void *context, char *buffer, int len);

int xmljInputCloseCallback (void *context);

int xmljOutputWriteCallback (void *context, const char *buffer, int len);

int xmljOutputCloseCallback (void *context);

OutputStreamContext *xmljNewOutputStreamContext (JNIEnv * env,

                                                 jobject outputStream);

void

xmljFreeOutputStreamContext (OutputStreamContext * outContext);

xmlCharEncoding

xmljDetectCharEncoding (JNIEnv * env, jbyteArray buffer);

int

xmljOutputWriteCallback (void *context, const char *buffer, int len)

{

  OutputStreamContext *outContext;

  JNIEnv *env;

  jbyteArray byteArray;

  outContext = (OutputStreamContext *) context;

  env = outContext->env;

  byteArray = (*env)->NewByteArray (env, len);

  if (0 != byteArray)

    {

      (*env)->SetByteArrayRegion (env, byteArray, 0, len, (jbyte *) buffer);

      (*env)->CallVoidMethod (env,

                              outContext->outputStream,

                              outContext->outputStreamWriteFunc, byteArray);

      (*env)->DeleteLocalRef (env, byteArray);

      return (*env)->ExceptionOccurred (env) ? -1 : len;

    }

  else

    {

      /* Out of memory, signal error */

      return -1;

    }

}

int

xmljOutputCloseCallback (void *context)

{

  OutputStreamContext *outContext;

  JNIEnv *env;

  outContext = (OutputStreamContext *) context;

  env = outContext->env;

  (*env)->CallVoidMethod (env,

                          outContext->outputStream,

                          outContext->outputStreamCloseFunc);

  return (*env)->ExceptionOccurred (env) ? -1 : 0;

}

int

xmljInputReadCallback (void *context, char *buffer, int len)

{

  InputStreamContext *inContext;

  JNIEnv *env;

  jint nread;

  int offset;

  inContext = (InputStreamContext *) context;

  env = inContext->env;

  nread = 0;

  for (offset = 0; offset < len && nread >= 0;)

    {

      nread = (*env)->CallIntMethod (env,

                                     inContext->inputStream,

                                     inContext->inputStreamReadFunc,

                                     inContext->bufferByteArray,

                                     0, MIN (len - offset,

                                             inContext->bufferLength));

      if (nread > 0)

        {

          (*env)->GetByteArrayRegion (env,

                                      inContext->bufferByteArray,

                                      0, nread, ((jbyte *) buffer) + offset);

          offset += nread;

        }

    }

  return (*env)->ExceptionOccurred (env) ? -1 : offset;

}

int

xmljInputCloseCallback (void *context)

{

  InputStreamContext *inContext;

  JNIEnv *env;

  inContext = (InputStreamContext *) context;

  env = inContext->env;

  (*env)->CallVoidMethod (env, inContext->inputStream,

                          inContext->inputStreamCloseFunc);

  return (*env)->ExceptionOccurred (env) ? -1 : 0;

}

InputStreamContext *

xmljNewInputStreamContext (JNIEnv * env, jobject inputStream)

{

  jclass inputStreamClass;

  InputStreamContext *result;

  inputStreamClass = (*env)->FindClass (env, "java/io/InputStream");

  if (inputStreamClass == NULL)

    {

      return NULL;

    }

  result = (InputStreamContext *) malloc (sizeof (InputStreamContext));

  if (result == NULL)

    {

      return NULL;

    }

  result->env = env;

  result->inputStream = inputStream;

  result->inputStreamReadFunc =

    (*env)->GetMethodID (env, inputStreamClass, "read", "([BII)I");

  result->inputStreamCloseFunc =

    (*env)->GetMethodID (env, inputStreamClass, "close", "()V");

  result->bufferLength = 4096;

  result->bufferByteArray = (*env)->NewByteArray (env, result->bufferLength);

  return result;

}

void

xmljFreeInputStreamContext (InputStreamContext * inContext)

{

  JNIEnv *env;

  env = inContext->env;

  (*env)->DeleteLocalRef (env, inContext->bufferByteArray);

  free (inContext);

}

OutputStreamContext *

xmljNewOutputStreamContext (JNIEnv * env, jobject outputStream)

{

  jclass outputStreamClass;

  OutputStreamContext *result;

  outputStreamClass = (*env)->FindClass (env, "java/io/OutputStream");

  if (outputStreamClass == NULL)

    {

      return NULL;

    }

  result = (OutputStreamContext *) malloc (sizeof (OutputStreamContext));

  if (result == NULL)

    {

      return NULL;

    }

  result->env = env;

  result->outputStream = outputStream;

  result->outputStreamWriteFunc =

    (*env)->GetMethodID (env, outputStreamClass, "write", "([B)V");

  result->outputStreamCloseFunc =

    (*env)->GetMethodID (env, outputStreamClass, "close", "()V");

  return result;

}

void

xmljFreeOutputStreamContext (OutputStreamContext * outContext)

{

  free (outContext);

}

SAXParseContext *

xmljNewSAXParseContext (JNIEnv * env, jobject obj, xmlParserCtxtPtr ctx,

                        jstring publicId, jstring systemId)

{

  SAXParseContext *ret;

  ret = (SAXParseContext *) malloc (sizeof (SAXParseContext));

  ret->env = env;

  ret->obj = obj;

  ret->ctx = ctx;

  ret->sax = ctx->sax;

  ret->loc = NULL;

  ret->publicId = publicId;

  ret->systemId = systemId;

  ret->startDTD = NULL;

  ret->externalEntityDecl = NULL;

  ret->internalEntityDecl = NULL;

  ret->resolveEntity = NULL;

  ret->notationDecl = NULL;

  ret->attributeDecl = NULL;

  ret->elementDecl = NULL;

  ret->unparsedEntityDecl = NULL;

  ret->setDocumentLocator = NULL;

  ret->startDocument = NULL;

  ret->endDocument = NULL;

  ret->startElement = NULL;

  ret->endElement = NULL;

  ret->characters = NULL;

  ret->ignorableWhitespace = NULL;

  ret->processingInstruction = NULL;

  ret->comment = NULL;

  ret->cdataBlock = NULL;

  ret->warning = NULL;

  ret->error = NULL;

  ret->fatalError = NULL;

  ret->resolveURIAndOpen = NULL;

  ret->stringClass = NULL;

  return ret;

}

void

xmljFreeSAXParseContext (SAXParseContext * saxCtx)

{

  free (saxCtx);

}

xmlCharEncoding

xmljDetectCharEncoding (JNIEnv * env, jbyteArray buffer)

{

  xmlCharEncoding ret;

  jint nread;

  if (buffer == NULL)

    {

      return XML_CHAR_ENCODING_ERROR;

    }

  nread = (*env)->GetArrayLength (env, buffer);

  if (nread >= 5)

    {

      jbyte nativeBuffer[DETECT_BUFFER_SIZE + 1];

      unsigned char converted[DETECT_BUFFER_SIZE + 1];

      int i;

      memset (nativeBuffer, 0, DETECT_BUFFER_SIZE + 1);

      (*env)->GetByteArrayRegion (env, buffer, 0, nread, nativeBuffer);

      /* Convert from signed to unsigned */

      for (i = 0; i < DETECT_BUFFER_SIZE + 1; i++)

        {

          converted[i] = UNSIGN (nativeBuffer[i]);

        }

      ret = xmlDetectCharEncoding (converted, nread);

    }

  else

    {

      ret = XML_CHAR_ENCODING_NONE;

    }

  return ret;

}

xmlParserCtxtPtr

xmljNewParserContext (JNIEnv * env,

                      jobject inputStream,

                      jbyteArray detectBuffer,

                      jstring publicId,

                      jstring systemId,

                      jstring base,

                      jboolean validate,

                      jboolean coalesce,

                      jboolean expandEntities,

                      jboolean loadEntities)

{

  InputStreamContext *inputContext;

  xmlCharEncoding encoding;

  xmlParserCtxtPtr ctx;

  int options;

  encoding = xmljDetectCharEncoding (env, detectBuffer);

  if (encoding != XML_CHAR_ENCODING_ERROR)

    {

      inputContext = xmljNewInputStreamContext (env, inputStream);

      if (NULL != inputContext)

        {

          /* NOTE: userdata must be NULL for DOM to work */

          ctx = xmlCreateIOParserCtxt (NULL,

                                       NULL,

                                       xmljInputReadCallback,

                                       xmljInputCloseCallback,

                                       inputContext,

                                       encoding);

          if (NULL != ctx)

            {

              ctx->userData = ctx;

              /* Set parsing options */

              options = 0;

              if (validate)

                {

                  options |= XML_PARSE_DTDVALID;

                }

              if (coalesce)

                {

                  options |= XML_PARSE_NOCDATA;

                }

              if (expandEntities)

                {

                  options |= XML_PARSE_NOENT;

                }

              if (loadEntities)

                {

                  options |= XML_PARSE_DTDLOAD;

                }

              if (xmlCtxtUseOptions (ctx, options))

                {

                  xmljThrowException (env,

                                      "java/lang/RuntimeException",

                                      "Unable to set xmlParserCtxtPtr options");

                }

              if (base != NULL)

                {

                  ctx->input->directory =

                    (*env)->GetStringUTFChars (env, base, 0);

                }

              return ctx;

            }

          xmljFreeInputStreamContext (inputContext);

        }

    }

  return NULL;

}

void

xmljFreeParserContext (xmlParserCtxtPtr ctx)

{

  InputStreamContext *inputStreamContext = NULL;

  if (ctx->input != NULL && ctx->input->buf != NULL)

    {

      inputStreamContext

        = (InputStreamContext *) ctx->input->buf->context;

    }

  xmlFreeParserCtxt (ctx);

  if (inputStreamContext != NULL)

    {

      xmljFreeInputStreamContext (inputStreamContext);

    }

}

xmlDocPtr

xmljParseDocument (JNIEnv * env,

                   jobject self,

                   jobject in,

                   jbyteArray detectBuffer,

                   jstring publicId,

                   jstring systemId,

                   jstring base,

                   jboolean validate,

                   jboolean coalesce,

                   jboolean expandEntities,

                   jboolean contentHandler,

                   jboolean dtdHandler,

                   jboolean entityResolver,

                   jboolean errorHandler,

                   jboolean declarationHandler,

                   jboolean lexicalHandler,

                   int mode)

{

  xmlParserCtxtPtr ctx;

  SAXParseContext *saxCtx;

  xmlSAXHandlerPtr sax;

  ctx = xmljNewParserContext (env, in, detectBuffer, publicId, systemId, base,

                              validate, coalesce, expandEntities,

                              entityResolver);

  if (ctx != NULL)

    {

      saxCtx = xmljNewSAXParseContext (env, self, ctx, publicId, systemId);

      if (saxCtx != NULL)

        {

          sax = xmljNewSAXHandler (contentHandler,

                                   dtdHandler,

                                   entityResolver,

                                   errorHandler,

                                   declarationHandler,

                                   lexicalHandler);

          if (sax != NULL)

            {

              return xmljParseDocument2 (env,

                                         ctx,

                                         saxCtx,

                                         sax,

                                         mode);

            }

          xmljFreeSAXParseContext (saxCtx);

        }

      xmljFreeParserContext (ctx);

    }

  if (!(*env)->ExceptionOccurred (env))

    {

      xmljThrowException (env, "java/io/IOException",

                          "Unable to create parser context");

    }

  return NULL;

}

xmlDocPtr

xmljParseDocument2 (JNIEnv * env,

                    xmlParserCtxtPtr ctx,

                    SAXParseContext *saxCtx,

                    xmlSAXHandlerPtr sax,

                    int mode)

{

  xmlSAXHandlerPtr orig;

  xmlDocPtr doc;

  int ret;

  ctx->_private = saxCtx;

  ctx->userData = ctx;

  orig = ctx->sax;

  ctx->sax = sax;

  xmljSetThreadContext (saxCtx);

  ret = xmlParseDocument (ctx);

  doc = ctx->myDoc;

  if (ret || !doc)

    {

      const char *msg = ctx->lastError.message;

      switch (mode)

        {

        case 0:

          xmljSAXFatalError (ctx, msg);

          break;

        case 1:

          xmljThrowDOMException (env, ret, msg);

          break;

        case 2:

          xmljThrowException (env,

                              "javax/xml/transform/TransformerException",

                              msg);

        }

    }

  xmljClearThreadContext ();

  ctx->sax = orig;

  free(sax);

  xmljFreeSAXParseContext (saxCtx);

  xmljFreeParserContext (ctx);

  xmljClearStringCache ();

  return doc;

}

xmlParserInputPtr

xmljNewParserInput (JNIEnv * env,

                    jobject inputStream,

                    jbyteArray detectBuffer,

                    xmlParserCtxtPtr parserContext)

{

  xmlParserInputPtr ret;

  xmlParserInputBufferPtr input;

  xmlCharEncoding encoding;

  encoding = xmljDetectCharEncoding (env, detectBuffer);

  if (encoding != XML_CHAR_ENCODING_ERROR)

    {

      input = xmljNewParserInputBuffer (env, inputStream, encoding);

      if (input != NULL)

        {

          ret = xmlNewIOInputStream (parserContext, input, encoding);

          return ret;

        }

      xmlFreeParserInputBuffer (input);

    }

  return NULL;

}

xmlParserInputBufferPtr

xmljNewParserInputBuffer (JNIEnv * env,

                          jobject inputStream, xmlCharEncoding encoding)

{

  xmlParserInputBufferPtr ret;

  InputStreamContext *inputContext;

  inputContext = xmljNewInputStreamContext (env, inputStream);

  if (NULL != inputContext)

    {

      ret = xmlParserInputBufferCreateIO (&xmljInputReadCallback,

                                          &xmljInputCloseCallback,

                                          inputContext, encoding);

      if (ret != NULL)

        return ret;

      xmljFreeInputStreamContext (inputContext);

    }

  return NULL;

}

void

xmljSaveFileToJavaOutputStream (JNIEnv * env, jobject outputStream,

                                xmlDocPtr tree,

                                const char *outputEncodingName)

{

  OutputStreamContext *outputContext =

    xmljNewOutputStreamContext (env, outputStream);

  xmlCharEncoding outputEncoding = xmlParseCharEncoding (outputEncodingName);

  xmlOutputBufferPtr outputBuffer =

    xmlOutputBufferCreateIO (xmljOutputWriteCallback,

                             xmljOutputCloseCallback,

                             outputContext,

                             xmlGetCharEncodingHandler (outputEncoding));

  /* Write result to output stream */

  xmlSaveFileTo (outputBuffer, tree, outputEncodingName);

  xmljFreeOutputStreamContext (outputContext);

}

/*

jobject

xmljResolveURI (SaxErrorContext * saxErrorContext,

                const char *URL, const char *ID)

{

  JNIEnv *env = saxErrorContext->env;

  jstring hrefString = (*env)->NewStringUTF (env, URL);

  jstring baseString = saxErrorContext->systemId;

  jobject sourceWrapper = (*env)->CallObjectMethod (env,

                                                    saxErrorContext->

                                                    saxErrorAdapter,

                                                    saxErrorContext->

                                                    resolveURIMethodID,

                                                    hrefString,

                                                    baseString);

  (*env)->DeleteLocalRef (env, hrefString);

  if (NULL == sourceWrapper)

    {

      return NULL;

    }

  else

    {

      jobject sourceInputStream = (*env)->CallObjectMethod (env,

                                                            sourceWrapper,

                                                            saxErrorContext->

                                                            getInputStreamMethodID);

      (*env)->DeleteLocalRef (env, sourceWrapper);

      if ((*env)->ExceptionOccurred (env))

        {

          -* Report to ErrorAdapter here? *-

          return NULL;

        }

      return sourceInputStream;

    }

}*/

xmlDocPtr

xmljResolveURIAndOpen (SAXParseContext *saxContext,

                       const char *URL,

                       const char *ID)

{

  jobject libxmlDocument;

  xmlDocPtr doc;

  JNIEnv *env = saxContext->env;

  jstring hrefString = (*env)->NewStringUTF (env, URL);

  jstring baseString = saxContext->systemId;

  if (saxContext->resolveURIAndOpen == NULL)

    {

      jclass cls = (*env)->GetObjectClass (env, saxContext->obj);

      saxContext->resolveURIAndOpen =

        (*env)->GetMethodID (env, cls, "resolveURIAndOpen",

                             "Ljava/lang/String;Ljava/lang/String)Lgnu/xml/libxmlj/transform/LibxmlDocument;");

    }

  libxmlDocument =

    (*env)->CallObjectMethod (env,

                              saxContext->obj,

                              saxContext->resolveURIAndOpen,

                              hrefString,

                              baseString);

  doc = (xmlDocPtr) xmljGetNodeID (env, libxmlDocument);

  (*env)->DeleteLocalRef (env, libxmlDocument);

  if ((*env)->ExceptionOccurred (env))

    {

      /* Report to ErrorAdapter here? */

      return NULL;

    }

  else

    {

      return doc;

    }

}

/*xmlParserInputPtr

xmljLoadExternalEntity (const char *URL, const char *ID,

                        xmlParserCtxtPtr ctxt)

{

  SaxErrorContext *saxErrorContext = xmljGetThreadContext ();

  JNIEnv *env = saxErrorContext->env;

  jstring hrefString = (*env)->NewStringUTF (env, URL);

  jstring baseString = saxErrorContext->systemId;

  jobject sourceWrapper = (*env)->CallObjectMethod (env,

                                                    saxErrorContext->

                                                    saxErrorAdapter,

                                                    saxErrorContext->

                                                    resolveURIMethodID,

                                                    hrefString,

                                                    baseString);

  (*env)->DeleteLocalRef (env, hrefString);

  if (NULL == sourceWrapper)

    {

      return NULL;

    }

  else

    {

      InputStreamContext *inputContext;

      xmlParserInputBufferPtr inputBuffer;

      xmlParserInputPtr inputStream;