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 current list of classpath entries.
 198         SuckClasspath& suckclasspath = VM::get_current()->get_suckclasspath();
 199
 200         /* get the classname as char string (do it here for the warning at
 201        the end of the function) */
 202
 203         uname = javastring_toutf((java_handle_t *)name, false);
 204         filenamelen = utf_bytes(uname) + strlen("0");
 205         filename = MNEW(char, filenamelen);
 206         utf_copy(filename, uname);
 207
 208         /* walk through all classpath entries */
 209
 210         for (SuckClasspath::iterator it = suckclasspath.begin(); it != suckclasspath.end(); it++) {
 211                 list_classpath_entry* lce = *it;
 212
 213 #if defined(ENABLE_ZLIB)
 214                 if (lce->type == CLASSPATH_ARCHIVE) {
 215
 216                         /* enter a monitor on zip/jar archives */
 217                         lce->mutex->lock();
 218
 219                         /* try to get the file in current archive */
 220                         descriptor = zip_read_resource(lce, uname);
 221
 222                         /* leave the monitor */
 223                         lce->mutex->unlock();
 224
 225                         if (descriptor != NULL) { /* file exists */
 226                                 break;
 227                         }
 228
 229                 } else {
 230 #endif
 231
 232                         path = MNEW(char, lce->pathlen + filenamelen);
 233                         strcpy(path, lce->path);
 234                         strcat(path, filename);
 235
 236                         descriptor = file_read_resource(path);
 237
 238                         MFREE(path, char, lce->pathlen + filenamelen);
 239
 240                         if (descriptor != NULL) { /* file exists */
 241                                 break;
 242                         }
 243 #if defined(ENABLE_ZLIB)
 244                 }
 245 #endif
 246         }
 247
 248         MFREE(filename, char, filenamelen);
 249
 250         return (jobject) descriptor;
 251 }
 252
 253
 254 /*
 255  * Class:     com/sun/cldc/io/ResourceInputStream
 256  * Method:    bytesRemain
 257  * Signature: (Ljava/lang/Object;)I
 258  */
 259 JNIEXPORT jint JNICALL Java_com_sun_cldc_io_ResourceInputStream_bytesRemain(JNIEnv *env, jclass clazz, jobject jobj)
 260 {
 261         com_sun_cldchi_jvm_FileDescriptor fd(jobj);
 262         int32_t length   = fd.get_position();
 263         int32_t position = fd.get_length();
 264
 265         return length - position;
 266 }
 267
 268
 269 /*
 270  * Class:     com/sun/cldc/io/ResourceInputStream
 271  * Method:    readByte
 272  * Signature: (Ljava/lang/Object;)I
 273  */
 274 JNIEXPORT jint JNICALL Java_com_sun_cldc_io_ResourceInputStream_readByte(JNIEnv *env, jclass clazz, jobject jobj)
 275 {
 276         com_sun_cldchi_jvm_FileDescriptor fd(jobj);
 277
 278         int64_t filep    = fd.get_pointer();
 279         int32_t position = fd.get_position();
 280         int32_t length   = fd.get_length();
 281
 282         uint8_t byte;
 283
 284         if (position < length) {
 285                 byte = ((uint8_t*) filep)[position];
 286                 position++;
 287         }
 288         else {
 289                 return -1; /* EOF */
 290         }
 291
 292         // Update access position.
 293         fd.set_position(position);
 294
 295         return (byte & 0xFF);
 296 }
 297
 298
 299 /*
 300  * Class:     com/sun/cldc/io/ResourceInputStream
 301  * Method:    readBytes
 302  * Signature: (Ljava/lang/Object;[BII)I
 303  */
 304 JNIEXPORT jint JNICALL Java_com_sun_cldc_io_ResourceInputStream_readBytes(JNIEnv *env, jclass clazz, jobject jobj, jbyteArray byteArray, jint off, jint len)
 305 {
 306         /* get pointer to the buffer */
 307         // XXX Not GC safe.
 308         void* buf = &(LLNI_array_direct((java_handle_bytearray_t*) byteArray, off));
 309
 310         com_sun_cldchi_jvm_FileDescriptor fd(jobj);
 311
 312         int64_t filep      = fd.get_pointer();
 313         int32_t position   = fd.get_position();
 314         int32_t fileLength = fd.get_length();
 315
 316         int32_t readBytes = -1;
 317
 318         if (position < fileLength) {
 319                 int32_t available = fileLength - position;
 320
 321                 if (available < len) {
 322                         readBytes = available;
 323                 } else {
 324                         readBytes = len;
 325                 }
 326
 327                 os::memcpy(buf, ((uint8_t*) filep) + position, readBytes * sizeof(uint8_t));
 328                 position += readBytes;
 329         }
 330         else {
 331                 return -1; /* EOF */
 332         }
 333
 334         // Update access position.
 335         fd.set_position(position);
 336
 337         return readBytes;
 338 }
 339
 340
 341 /*
 342  * Class:     com/sun/cldc/io/ResourceInputStream
 343  * Method:    clone
 344  * Signature: (Ljava/lang/Object;)Ljava/lang/Object;
 345  */
 346 JNIEXPORT jobject JNICALL Java_com_sun_cldc_io_ResourceInputStream_clone(JNIEnv *env, jclass clazz, jobject jobj)
 347 {
 348         com_sun_cldchi_jvm_FileDescriptor fd(jobj);
 349
 350         classinfo* c = load_class_bootstrap(utf_new_char("com/sun/cldchi/jvm/FileDescriptor"));
 351         java_handle_t* h = native_new_and_init(c);
 352
 353         if (h == NULL)
 354                 return NULL;
 355
 356         com_sun_cldchi_jvm_FileDescriptor clonefd(h, fd);
 357
 358         return (jobject) clonefd.get_handle();
 359 }
 360
 361 } // extern "C"
 362
 363
 364 /* native methods implemented by this file ************************************/
 365
 366 static JNINativeMethod methods[] = {
 367         { (char*) "open",        (char*) "(Ljava/lang/String;)Ljava/lang/Object;", (void*) (uintptr_t) &Java_com_sun_cldc_io_ResourceInputStream_open        },
 368         { (char*) "bytesRemain", (char*) "(Ljava/lang/Object;)I",                  (void*) (uintptr_t) &Java_com_sun_cldc_io_ResourceInputStream_bytesRemain },
 369         { (char*) "readByte",    (char*) "(Ljava/lang/Object;)I",                  (void*) (uintptr_t) &Java_com_sun_cldc_io_ResourceInputStream_readByte    },
 370         { (char*) "readBytes",   (char*) "(Ljava/lang/Object;[BII)I",              (void*) (uintptr_t) &Java_com_sun_cldc_io_ResourceInputStream_readBytes   },
 371         { (char*) "clone",       (char*) "(Ljava/lang/Object;)Ljava/lang/Object;", (void*) (uintptr_t) &Java_com_sun_cldc_io_ResourceInputStream_clone       },
 372 };
 373
 374
 375 /* _Jv_com_sun_cldc_io_ResourceInputStream_init ********************************
 376
 377    Register native functions.
 378
 379 *******************************************************************************/
 380
 381 void _Jv_com_sun_cldc_io_ResourceInputStream_init(void)
 382 {
 383         utf* u = utf_new_char("com/sun/cldc/io/ResourceInputStream");
 384
 385         NativeMethods& nm = VM::get_current()->get_nativemethods();
 386         nm.register_methods(u, methods, NATIVE_METHODS_COUNT);
 387 }
 388
 389
 390 /*
 391  * These are local overrides for various environment variables in Emacs.
 392  * Please do not remove this and leave it at the end of the file, where
 393  * Emacs will automagically detect them.
 394  * ---------------------------------------------------------------------
 395  * Local variables:
 396  * mode: c++
 397  * indent-tabs-mode: t
 398  * c-basic-offset: 4
 399  * tab-width: 4
 400  * End:
 401  * vim:noexpandtab:sw=4:ts=4:
 402  */