/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

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

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#include <sys/types.h>

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <stdarg.h>

#include <limits.h>

#include <com_sun_java_util_jar_pack_NativeUnpack.h>

#include "jni_util.h"

#include "defines.h"

#include "bytes.h"

#include "utils.h"

#include "coding.h"

#include "bands.h"

#include "constants.h"

#include "zip.h"

#include "unpack.h"

static jfieldID  unpackerPtrFID;

static jmethodID currentInstMID;

static jmethodID readInputMID;

static jclass    NIclazz;

static jmethodID getUnpackerPtrMID;

static char* dbg = null;

#define THROW_IOE(x) JNU_ThrowIOException(env,x)

#define CHECK_EXCEPTION_RETURN_VOID_THROW_IOE(CERVTI_exception, CERVTI_message) \

    do { \

        if ((env)->ExceptionOccurred()) { \

            THROW_IOE(CERVTI_message); \

            return; \

        } \

        if ((CERVTI_exception) == NULL) { \

                THROW_IOE(CERVTI_message); \

                return; \

        } \

    } while (JNI_FALSE)

#define CHECK_EXCEPTION_RETURN_VALUE(CERL_exception, CERL_return_value) \

    do { \

        if ((env)->ExceptionOccurred()) { \

            return CERL_return_value; \

        } \

        if ((CERL_exception) == NULL) { \

            return CERL_return_value; \

        } \

    } while (JNI_FALSE)

// If these useful macros aren't defined in jni_util.h then define them here

#ifndef CHECK_NULL_RETURN

#define CHECK_NULL_RETURN(x, y) \

    do { \

        if ((x) == NULL) return (y); \

    } while (JNI_FALSE)

#endif

#ifndef CHECK_EXCEPTION_RETURN

#define CHECK_EXCEPTION_RETURN(env, y) \

    do { \

        if ((*env)->ExceptionCheck(env)) return (y); \

    } while (JNI_FALSE)

#endif

static jlong read_input_via_jni(unpacker* self,

                                void* buf, jlong minlen, jlong maxlen);

static unpacker* get_unpacker(JNIEnv *env, jobject pObj, bool noCreate=false) {

  unpacker* uPtr;

  jlong p = env->CallLongMethod(pObj, getUnpackerPtrMID);

  uPtr = (unpacker*)jlong2ptr(p);

  if (uPtr == null) {

    if (noCreate)  return null;

    uPtr = new unpacker();

    if (uPtr == null) {

      THROW_IOE(ERROR_ENOMEM);

      return null;

    }

    //fprintf(stderr, "get_unpacker(%p) uPtr=%p initializing\n", pObj, uPtr);

    uPtr->init(read_input_via_jni);

    uPtr->jniobj = (void*) env->NewGlobalRef(pObj);

    env->SetLongField(pObj, unpackerPtrFID, ptr2jlong(uPtr));

  }

  uPtr->jnienv = env;  // keep refreshing this in case of MT access

  return uPtr;

}

// This is the harder trick:  Pull the current state out of mid-air.

static unpacker* get_unpacker() {

  //fprintf(stderr, "get_unpacker()\n");

  JavaVM* vm = null;

  jsize nVM = 0;

  jint retval = JNI_GetCreatedJavaVMs(&vm, 1, &nVM);

  // other VM implements may differ, thus for correctness, we need these checks

  if (retval != JNI_OK || nVM != 1)

    return null;

  void* envRaw = null;

  vm->GetEnv(&envRaw, JNI_VERSION_1_1);

  JNIEnv* env = (JNIEnv*) envRaw;

  //fprintf(stderr, "get_unpacker() env=%p\n", env);

  CHECK_NULL_RETURN(env, NULL);

  jobject pObj = env->CallStaticObjectMethod(NIclazz, currentInstMID);

  // We should check upon the known non-null variable because here we want to check

  // only for pending exceptions. If pObj is null we'll deal with it later.

  CHECK_EXCEPTION_RETURN_VALUE(env, NULL);

  //fprintf(stderr, "get_unpacker0() pObj=%p\n", pObj);

  if (pObj != null) {

    // Got pObj and env; now do it the easy way.

    return get_unpacker(env, pObj);

  }

  // this should really not happen, if it does something is seriously

  // wrong throw an exception

  THROW_IOE(ERROR_INTERNAL);

  return null;

}

static void free_unpacker(JNIEnv *env, jobject pObj, unpacker* uPtr) {

  if (uPtr != null) {

    //fprintf(stderr, "free_unpacker(%p) uPtr=%p\n", pObj, uPtr);

    env->DeleteGlobalRef((jobject) uPtr->jniobj);

    uPtr->jniobj = null;

    uPtr->free();

    delete uPtr;

    env->SetLongField(pObj, unpackerPtrFID, (jlong)null);

   }

}

unpacker* unpacker::current() {

  return get_unpacker();

}

// Callback for fetching data, Java style.  Calls NativeUnpack.readInputFn().

static jlong read_input_via_jni(unpacker* self,

                                void* buf, jlong minlen, jlong maxlen) {

  JNIEnv* env = (JNIEnv*) self->jnienv;

  jobject pbuf = env->NewDirectByteBuffer(buf, maxlen);

  return env->CallLongMethod((jobject) self->jniobj, readInputMID,

                             pbuf, minlen);

}

JNIEXPORT void JNICALL

Java_com_sun_java_util_jar_pack_NativeUnpack_initIDs(JNIEnv *env, jclass clazz) {

#ifndef PRODUCT

  dbg = getenv("DEBUG_ATTACH");

  while( dbg != null) { sleep(10); }

#endif

  NIclazz = (jclass) env->NewGlobalRef(clazz);

  unpackerPtrFID = env->GetFieldID(clazz, "unpackerPtr", "J");

  CHECK_EXCEPTION_RETURN_VOID_THROW_IOE(unpackerPtrFID, ERROR_INIT);

  currentInstMID = env->GetStaticMethodID(clazz, "currentInstance",

                                          "()Ljava/lang/Object;");

  CHECK_EXCEPTION_RETURN_VOID_THROW_IOE(currentInstMID, ERROR_INIT);

  readInputMID = env->GetMethodID(clazz, "readInputFn",

                                  "(Ljava/nio/ByteBuffer;J)J");

  CHECK_EXCEPTION_RETURN_VOID_THROW_IOE(readInputMID, ERROR_INIT);

  getUnpackerPtrMID = env->GetMethodID(clazz, "getUnpackerPtr", "()J");

  CHECK_EXCEPTION_RETURN_VOID_THROW_IOE(getUnpackerPtrMID, ERROR_INIT);

}

JNIEXPORT jlong JNICALL

Java_com_sun_java_util_jar_pack_NativeUnpack_start(JNIEnv *env, jobject pObj,

                                   jobject pBuf, jlong offset) {

  // try to get the unpacker pointer the hard way first, we do this to ensure

  // valid object pointers and env is intact, if not now is good time to bail.

  unpacker* uPtr = get_unpacker();

  //fprintf(stderr, "start(%p) uPtr=%p initializing\n", pObj, uPtr);

  CHECK_EXCEPTION_RETURN_VALUE(uPtr, -1);

  // redirect our io to the default log file or whatever.

  uPtr->redirect_stdio();

  void*  buf    = null;

  size_t buflen = 0;

  if (pBuf != null) {

    buf    = env->GetDirectBufferAddress(pBuf);

    buflen = (size_t)env->GetDirectBufferCapacity(pBuf);

    if (buflen == 0)  buf = null;

    if (buf == null) { THROW_IOE(ERROR_INTERNAL); return 0; }

    if ((size_t)offset >= buflen)

      { buf = null; buflen = 0; }

    else

      { buf = (char*)buf + (size_t)offset; buflen -= (size_t)offset; }

  }

  // before we start off we make sure there is no other error by the time we

  // get here

  if (uPtr->aborting()) {

    THROW_IOE(uPtr->get_abort_message());

    return 0;

  }

  uPtr->start(buf, buflen);

  if (uPtr->aborting()) {

    THROW_IOE(uPtr->get_abort_message());

    return 0;

  }

  return ((jlong)

          uPtr->get_segments_remaining() << 32)

    + uPtr->get_files_remaining();

}

JNIEXPORT jboolean JNICALL

Java_com_sun_java_util_jar_pack_NativeUnpack_getNextFile(JNIEnv *env, jobject pObj,

                                         jobjectArray pParts) {

  unpacker* uPtr = get_unpacker(env, pObj);

  CHECK_EXCEPTION_RETURN_VALUE(uPtr, false);

  unpacker::file* filep = uPtr->get_next_file();

  if (uPtr->aborting()) {

    THROW_IOE(uPtr->get_abort_message());

    return false;

  }

  CHECK_NULL_RETURN(filep, false);

  assert(filep == &uPtr->cur_file);

  int pidx = 0, iidx = 0;

  jintArray pIntParts = (jintArray) env->GetObjectArrayElement(pParts, pidx++);

  CHECK_EXCEPTION_RETURN_VALUE(pIntParts, false);

  jint*     intParts  = env->GetIntArrayElements(pIntParts, null);

  intParts[iidx++] = (jint)( (julong)filep->size >> 32 );

  intParts[iidx++] = (jint)( (julong)filep->size >>  0 );

  intParts[iidx++] = filep->modtime;

  intParts[iidx++] = filep->deflate_hint() ? 1 : 0;

  env->ReleaseIntArrayElements(pIntParts, intParts, JNI_COMMIT);

  jstring filename = env->NewStringUTF(filep->name);

  CHECK_EXCEPTION_RETURN_VALUE(filename, false);

  env->SetObjectArrayElement(pParts, pidx++, filename);

  CHECK_EXCEPTION_RETURN_VALUE(uPtr, false);

  jobject pDataBuf = null;

  if (filep->data[0].len > 0) {

    pDataBuf = env->NewDirectByteBuffer(filep->data[0].ptr,

                                        filep->data[0].len);

    CHECK_EXCEPTION_RETURN_VALUE(pDataBuf, false);

  }

  env->SetObjectArrayElement(pParts, pidx++, pDataBuf);

  CHECK_EXCEPTION_RETURN_VALUE(uPtr, false);

  pDataBuf = null;

  if (filep->data[1].len > 0) {

    pDataBuf = env->NewDirectByteBuffer(filep->data[1].ptr,

                                        filep->data[1].len);

    CHECK_EXCEPTION_RETURN_VALUE(pDataBuf, false);

  }

  env->SetObjectArrayElement(pParts, pidx++, pDataBuf);

  CHECK_EXCEPTION_RETURN_VALUE(uPtr, false);

  return true;

}

JNIEXPORT jobject JNICALL

Java_com_sun_java_util_jar_pack_NativeUnpack_getUnusedInput(JNIEnv *env, jobject pObj) {

  unpacker* uPtr = get_unpacker(env, pObj);

  CHECK_EXCEPTION_RETURN_VALUE(uPtr, NULL);

  unpacker::file* filep = &uPtr->cur_file;

  if (uPtr->aborting()) {

    THROW_IOE(uPtr->get_abort_message());

    return null;

  }

  // We have fetched all the files.

  // Now swallow up any remaining input.

  if (uPtr->input_remaining() == 0) {

    return null;

  } else {

    bytes remaining_bytes;

    remaining_bytes.malloc(uPtr->input_remaining());

    remaining_bytes.copyFrom(uPtr->input_scan(), uPtr->input_remaining());

    return env->NewDirectByteBuffer(remaining_bytes.ptr, remaining_bytes.len);

  }

}

JNIEXPORT jlong JNICALL

Java_com_sun_java_util_jar_pack_NativeUnpack_finish(JNIEnv *env, jobject pObj) {

  unpacker* uPtr = get_unpacker(env, pObj, false);

  CHECK_EXCEPTION_RETURN_VALUE(uPtr, 0);

  size_t consumed = uPtr->input_consumed();

  free_unpacker(env, pObj, uPtr);

  return consumed;

}

JNIEXPORT jboolean JNICALL

Java_com_sun_java_util_jar_pack_NativeUnpack_setOption(JNIEnv *env, jobject pObj,

                                       jstring pProp, jstring pValue) {

  unpacker*   uPtr  = get_unpacker(env, pObj);

  CHECK_EXCEPTION_RETURN_VALUE(uPtr, false);

  const char* prop  = env->GetStringUTFChars(pProp, JNI_FALSE);

  CHECK_EXCEPTION_RETURN_VALUE(prop, false);

  const char* value = env->GetStringUTFChars(pValue, JNI_FALSE);

  CHECK_EXCEPTION_RETURN_VALUE(value, false);

  jboolean   retval = uPtr->set_option(prop, value);

  env->ReleaseStringUTFChars(pProp,  prop);

  env->ReleaseStringUTFChars(pValue, value);

  return retval;

}

JNIEXPORT jstring JNICALL

Java_com_sun_java_util_jar_pack_NativeUnpack_getOption(JNIEnv *env, jobject pObj,

                                       jstring pProp) {

  unpacker*   uPtr  = get_unpacker(env, pObj);

  CHECK_EXCEPTION_RETURN_VALUE(uPtr, NULL);

  const char* prop  = env->GetStringUTFChars(pProp, JNI_FALSE);

  CHECK_EXCEPTION_RETURN_VALUE(prop, NULL);

  const char* value = uPtr->get_option(prop);

  CHECK_EXCEPTION_RETURN_VALUE(value, NULL);

  env->ReleaseStringUTFChars(pProp, prop);

  return env->NewStringUTF(value);

}