src/native/vm/cldc1.1/com_sun_cldc_io_ResourceInputStream.cpp

   1 /* src/native/vm/cldc1.1/com_sun_cldc_io_ResourceInputStream.cpp
   2
   3    Copyright (C) 2007, 2008
   4    CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
   5
   6    This file is part of CACAO.
   7
   8    This program is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU General Public License as
  10    published by the Free Software Foundation; either version 2, or (at
  11    your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.
  22
  23 */
  24
  25
  26 #include "config.h"
  27
  28 #include <sys/stat.h>
  29 #include <sys/mman.h>
  30 #include <fcntl.h>
  31 #include <errno.h>
  32 #include <zlib.h>
  33
  34 #include "mm/memory.hpp"
  35
  36 #include "native/jni.hpp"
  37 #include "native/llni.h"
  38 #include "native/native.hpp"
  39
  40 #if defined(ENABLE_JNI_HEADERS)
  41 # include "native/include/com_sun_cldc_io_ResourceInputStream.h"
  42 #endif
  43
  44 #include "threads/mutex.hpp"
  45
  46 #include "vm/jit/builtin.hpp"
  47 #include "vm/exceptions.hpp"
  48 #include "vm/javaobjects.hpp"
  49 #include "vm/string.hpp"
  50 #include "vm/types.h"
  51 #include "vm/vm.hpp" /* REMOVE ME: temporarily */
  52 #include "vm/zip.hpp"
  53
  54
  55 static java_handle_t* zip_read_resource(list_classpath_entry *lce, utf *name)
  56 {
  57         hashtable_zipfile_entry *htzfe;
  58         lfh                      lfh;
  59         u1                      *indata;
  60         u1                      *outdata;
  61         z_stream                 zs;
  62         int                      err;
  63
  64         classinfo *ci;
  65
  66         /* try to find the class in the current archive */
  67
  68         htzfe = zip_find(lce, name);
  69
  70         if (htzfe == NULL)
  71                 return NULL;
  72
  73         /* read stuff from local file header */
  74
  75         lfh.filenamelength   = SUCK_LE_U2(htzfe->data + LFH_FILE_NAME_LENGTH);
  76         lfh.extrafieldlength = SUCK_LE_U2(htzfe->data + LFH_EXTRA_FIELD_LENGTH);
  77
  78         indata = htzfe->data +
  79                 LFH_HEADER_SIZE +
  80                 lfh.filenamelength +
  81                 lfh.extrafieldlength;
  82
  83         /* allocate buffer for uncompressed data */
  84
  85         outdata = MNEW(u1, htzfe->uncompressedsize);
  86
  87         /* how is the file stored? */
  88
  89         switch (htzfe->compressionmethod) {
  90         case Z_DEFLATED:
  91                 /* fill z_stream structure */
  92
  93                 zs.next_in   = indata;
  94                 zs.avail_in  = htzfe->compressedsize;
  95                 zs.next_out  = outdata;
  96                 zs.avail_out = htzfe->uncompressedsize;
  97
  98                 zs.zalloc = Z_NULL;
  99                 zs.zfree  = Z_NULL;
 100                 zs.opaque = Z_NULL;
 101
 102                 /* initialize this inflate run */
 103
 104                 if (inflateInit2(&zs, -MAX_WBITS) != Z_OK)
 105                         vm_abort("zip_get: inflateInit2 failed: %s", strerror(errno));
 106
 107                 /* decompress the file into buffer */
 108
 109                 err = inflate(&zs, Z_SYNC_FLUSH);
 110
 111                 if ((err != Z_STREAM_END) && (err != Z_OK))
 112                         vm_abort("zip_get: inflate failed: %s", strerror(errno));
 113
 114                 /* finish this inflate run */
 115
 116                 if (inflateEnd(&zs) != Z_OK)
 117                         vm_abort("zip_get: inflateEnd failed: %s", strerror(errno));
 118                 break;
 119
 120         case 0:
 121                 /* uncompressed file, just copy the data */
 122                 MCOPY(outdata, indata, u1, htzfe->compressedsize);
 123                 break;
 124
 125         default:
 126                 vm_abort("zip_get: unknown compression method %d",
 127                                  htzfe->compressionmethod);
 128         }
 129
 130         // Create a file descriptor object.
 131         ci = load_class_bootstrap(utf_new_char("com/sun/cldchi/jvm/FileDescriptor"));
 132         java_handle_t* h = native_new_and_init(ci);
 133
 134         if (h == NULL)
 135                 return NULL;
 136
 137         com_sun_cldchi_jvm_FileDescriptor fd(h, (int64_t) outdata, 0, htzfe->uncompressedsize);
 138
 139         return fd.get_handle();
 140 }
 141
 142
 143 static java_handle_t* file_read_resource(char *path)
 144 {
 145         int len;
 146         struct stat statBuffer;
 147         u1 *filep;
 148         classinfo *ci;
 149         int fd;
 150
 151         fd = open(path, O_RDONLY);
 152
 153         if (fd > 0) {
 154
 155                 if (fstat(fd, &statBuffer) != -1) {
 156                         len = statBuffer.st_size;
 157                 } else {
 158                         return NULL;
 159                 }
 160
 161                 /* Map file into the memory */
 162                 filep = (u1*) mmap(0, len, PROT_READ, MAP_PRIVATE, fd, 0);
 163
 164                 /* Create a file descriptor object */
 165                 ci = load_class_bootstrap(utf_new_char("com/sun/cldchi/jvm/FileDescriptor"));
 166                 java_handle_t* h = native_new_and_init(ci);
 167
 168                 if (h == NULL)
 169                         return NULL;
 170
 171                 com_sun_cldchi_jvm_FileDescriptor fd(h, (int64_t) filep, 0, len);
 172
 173                 return fd.get_handle();
 174         }
 175         else {
 176                 return NULL;
 177         }
 178 }
 179
 180
 181 // Native functions are exported as C functions.
 182 extern "C" {
 183
 184 /*
 185  * Class:     com/sun/cldc/io/ResourceInputStream
 186  * Method:    open
 187  * Signature: (Ljava/lang/String;)Ljava/lang/Object;
 188  */
 189 JNIEXPORT jobject JNICALL Java_com_sun_cldc_io_ResourceInputStream_open(JNIEnv *env, jclass clazz, jstring name)
 190 {
 191         char *filename;
 192         s4 filenamelen;
 193         char *path;
 194         utf *uname;
 195         java_handle_t* descriptor;
 196
 197         /* get the classname as char string (do it here for the warning at
 198        the end of the function) */
 199
 200         uname = javastring_toutf((java_handle_t *)name, false);
 201         filenamelen = utf_bytes(uname) + strlen("0");
 202         filename = MNEW(char, filenamelen);
 203         utf_copy(filename, uname);
 204
 205         /* walk through all classpath entries */
 206
 207         for (List<list_classpath_entry*>::iterator it = list_classpath_entries->begin(); it != list_classpath_entries->end(); it++) {
 208                 list_classpath_entry* lce = *it;
 209
 210 #if defined(ENABLE_ZLIB)
 211                 if (lce->type == CLASSPATH_ARCHIVE) {
 212
 213                         /* enter a monitor on zip/jar archives */
 214                         lce->mutex->lock();
 215
 216                         /* try to get the file in current archive */
 217                         descriptor = zip_read_resource(lce, uname);
 218
 219                         /* leave the monitor */
 220                         lce->mutex->unlock();
 221
 222                         if (descriptor != NULL) { /* file exists */
 223                                 break;
 224                         }
 225
 226                 } else {
 227 #endif
 228
 229                         path = MNEW(char, lce->pathlen + filenamelen);
 230                         strcpy(path, lce->path);
 231                         strcat(path, filename);
 232
 233                         descriptor = file_read_resource(path);
 234
 235                         MFREE(path, char, lce->pathlen + filenamelen);
 236
 237                         if (descriptor != NULL) { /* file exists */
 238                                 break;
 239                         }
 240 #if defined(ENABLE_ZLIB)
 241                 }
 242 #endif
 243         }
 244
 245         MFREE(filename, char, filenamelen);
 246
 247         return (jobject) descriptor;
 248 }
 249
 250
 251 /*
 252  * Class:     com/sun/cldc/io/ResourceInputStream
 253  * Method:    bytesRemain
 254  * Signature: (Ljava/lang/Object;)I
 255  */
 256 JNIEXPORT jint JNICALL Java_com_sun_cldc_io_ResourceInputStream_bytesRemain(JNIEnv *env, jclass clazz, jobject jobj)
 257 {
 258         com_sun_cldchi_jvm_FileDescriptor fd(jobj);
 259         int32_t length   = fd.get_position();
 260         int32_t position = fd.get_length();
 261
 262         return length - position;
 263 }
 264
 265
 266 /*
 267  * Class:     com/sun/cldc/io/ResourceInputStream
 268  * Method:    readByte
 269  * Signature: (Ljava/lang/Object;)I
 270  */
 271 JNIEXPORT jint JNICALL Java_com_sun_cldc_io_ResourceInputStream_readByte(JNIEnv *env, jclass clazz, jobject jobj)
 272 {
 273         com_sun_cldchi_jvm_FileDescriptor fd(jobj);
 274
 275         int64_t filep    = fd.get_pointer();
 276         int32_t position = fd.get_position();
 277         int32_t length   = fd.get_length();
 278
 279         uint8_t byte;
 280
 281         if (position < length) {
 282                 byte = ((uint8_t*) filep)[position];
 283                 position++;
 284         }
 285         else {
 286                 return -1; /* EOF */
 287         }
 288
 289         // Update access position.
 290         fd.set_position(position);
 291
 292         return (byte & 0xFF);
 293 }
 294
 295
 296 /*
 297  * Class:     com/sun/cldc/io/ResourceInputStream
 298  * Method:    readBytes
 299  * Signature: (Ljava/lang/Object;[BII)I
 300  */
 301 JNIEXPORT jint JNICALL Java_com_sun_cldc_io_ResourceInputStream_readBytes(JNIEnv *env, jclass clazz, jobject jobj, jbyteArray byteArray, jint off, jint len)
 302 {
 303         /* get pointer to the buffer */
 304         // XXX Not GC safe.
 305         void* buf = &(LLNI_array_direct((java_handle_bytearray_t*) byteArray, off));
 306
 307         com_sun_cldchi_jvm_FileDescriptor fd(jobj);
 308
 309         int64_t filep      = fd.get_pointer();
 310         int32_t position   = fd.get_position();
 311         int32_t fileLength = fd.get_length();
 312
 313         int32_t readBytes = -1;
 314
 315         if (position < fileLength) {
 316                 int32_t available = fileLength - position;
 317
 318                 if (available < len) {
 319                         readBytes = available;
 320                 } else {
 321                         readBytes = len;
 322                 }
 323
 324                 os::memcpy(buf, ((uint8_t*) filep) + position, readBytes * sizeof(uint8_t));
 325                 position += readBytes;
 326         }
 327         else {
 328                 return -1; /* EOF */
 329         }
 330
 331         // Update access position.
 332         fd.set_position(position);
 333
 334         return readBytes;
 335 }
 336
 337
 338 /*
 339  * Class:     com/sun/cldc/io/ResourceInputStream
 340  * Method:    clone
 341  * Signature: (Ljava/lang/Object;)Ljava/lang/Object;
 342  */
 343 JNIEXPORT jobject JNICALL Java_com_sun_cldc_io_ResourceInputStream_clone(JNIEnv *env, jclass clazz, jobject jobj)
 344 {
 345         com_sun_cldchi_jvm_FileDescriptor fd(jobj);
 346
 347         classinfo* c = load_class_bootstrap(utf_new_char("com/sun/cldchi/jvm/FileDescriptor"));
 348         java_handle_t* h = native_new_and_init(c);
 349
 350         if (h == NULL)
 351                 return NULL;
 352
 353         com_sun_cldchi_jvm_FileDescriptor clonefd(h, fd);
 354
 355         return (jobject) clonefd.get_handle();
 356 }
 357
 358 } // extern "C"
 359
 360
 361 /* native methods implemented by this file ************************************/
 362
 363 static JNINativeMethod methods[] = {
 364         { (char*) "open",        (char*) "(Ljava/lang/String;)Ljava/lang/Object;", (void*) (uintptr_t) &Java_com_sun_cldc_io_ResourceInputStream_open        },
 365         { (char*) "bytesRemain", (char*) "(Ljava/lang/Object;)I",                  (void*) (uintptr_t) &Java_com_sun_cldc_io_ResourceInputStream_bytesRemain },
 366         { (char*) "readByte",    (char*) "(Ljava/lang/Object;)I",                  (void*) (uintptr_t) &Java_com_sun_cldc_io_ResourceInputStream_readByte    },
 367         { (char*) "readBytes",   (char*) "(Ljava/lang/Object;[BII)I",              (void*) (uintptr_t) &Java_com_sun_cldc_io_ResourceInputStream_readBytes   },
 368         { (char*) "clone",       (char*) "(Ljava/lang/Object;)Ljava/lang/Object;", (void*) (uintptr_t) &Java_com_sun_cldc_io_ResourceInputStream_clone       },
 369 };
 370
 371
 372 /* _Jv_com_sun_cldc_io_ResourceInputStream_init ********************************
 373
 374    Register native functions.
 375
 376 *******************************************************************************/
 377
 378 void _Jv_com_sun_cldc_io_ResourceInputStream_init(void)
 379 {
 380         utf* u = utf_new_char("com/sun/cldc/io/ResourceInputStream");
 381
 382         NativeMethods& nm = VM::get_current()->get_nativemethods();
 383         nm.register_methods(u, methods, NATIVE_METHODS_COUNT);
 384 }
 385
 386
 387 /*
 388  * These are local overrides for various environment variables in Emacs.
 389  * Please do not remove this and leave it at the end of the file, where
 390  * Emacs will automagically detect them.
 391  * ---------------------------------------------------------------------
 392  * Local variables:
 393  * mode: c++
 394  * indent-tabs-mode: t
 395  * c-basic-offset: 4
 396  * tab-width: 4
 397  * End:
 398  * vim:noexpandtab:sw=4:ts=4:
 399  */