2
* Licensed to the Apache Software Foundation (ASF) under one or more
3
* contributor license agreements. See the NOTICE file distributed with this
4
* work for additional information regarding copyright ownership. The ASF
5
* licenses this file to You under the Apache License, Version 2.0 (the
6
* "License"); you may not use this file except in compliance with the License.
7
* You may obtain a copy of the License at
9
* http://www.apache.org/licenses/LICENSE-2.0
11
* Unless required by applicable law or agreed to in writing, software
12
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
13
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
14
* License for the specific language governing permissions and limitations under
22
* Windows Native IO methods.
27
* Utility to format a Windows system error code into an exception.
29
void throwIOException(JNIEnv *env, DWORD error)
34
ioex = env->FindClass("java/io/IOException");
37
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
38
NULL, error, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &msg, 0, NULL );
39
env->ThrowNew(ioex, msg);
45
* Utility to throw Exceptions on bad input
47
void throwException(JNIEnv *env, const char *clazz, const char *msg)
49
jclass exc = env->FindClass(clazz);
52
env->ThrowNew(exc, msg);
57
* Opens a handle to a file.
59
* Class: org_apache_lucene_store_WindowsDirectory
61
* Signature: (Ljava/lang/String;)J
63
JNIEXPORT jlong JNICALL Java_org_apache_lucene_store_WindowsDirectory_open
64
(JNIEnv *env, jclass ignored, jstring filename)
69
if (filename == NULL) {
70
throwException(env, "java/lang/NullPointerException", "filename cannot be null");
74
fname = (char *) env->GetStringUTFChars(filename, NULL);
77
throwException(env, "java/lang/IllegalArgumentException", "invalid filename");
81
handle = CreateFile(fname, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
82
NULL, OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, NULL);
84
env->ReleaseStringUTFChars(filename, fname);
86
if (handle == INVALID_HANDLE_VALUE) {
87
throwIOException(env, GetLastError());
91
return (jlong) handle;
95
* Reads data into the byte array, starting at offset, for length characters.
96
* The read is positioned at pos.
98
* Class: org_apache_lucene_store_WindowsDirectory
100
* Signature: (J[BIIJ)I
102
JNIEXPORT jint JNICALL Java_org_apache_lucene_store_WindowsDirectory_read
103
(JNIEnv *env, jclass ignored, jlong fd, jbyteArray bytes, jint offset, jint length, jlong pos)
105
OVERLAPPED io = { 0 };
108
io.Offset = (DWORD) (pos & 0xFFFFFFFF);
109
io.OffsetHigh = (DWORD) ((pos >> 0x20) & 0x7FFFFFFF);
112
throwException(env, "java/lang/NullPointerException", "bytes cannot be null");
116
if (length <= 4096) { /* For small buffers, avoid GetByteArrayElements' copy */
119
if (ReadFile((HANDLE) fd, &buffer, length, &numRead, &io)) {
120
env->SetByteArrayRegion(bytes, offset, numRead, (const jbyte *) buffer);
122
throwIOException(env, GetLastError());
127
jbyte *buffer = env->GetByteArrayElements (bytes, NULL);
129
if (!ReadFile((HANDLE) fd, (void *)(buffer+offset), length, &numRead, &io)) {
130
throwIOException(env, GetLastError());
134
env->ReleaseByteArrayElements(bytes, buffer, numRead == 0 || numRead == -1 ? JNI_ABORT : 0);
141
* Closes a handle to a file
143
* Class: org_apache_lucene_store_WindowsDirectory
147
JNIEXPORT void JNICALL Java_org_apache_lucene_store_WindowsDirectory_close
148
(JNIEnv *env, jclass ignored, jlong fd)
150
if (!CloseHandle((HANDLE) fd)) {
151
throwIOException(env, GetLastError());
156
* Returns the length in bytes of a file.
158
* Class: org_apache_lucene_store_WindowsDirectory
162
JNIEXPORT jlong JNICALL Java_org_apache_lucene_store_WindowsDirectory_length
163
(JNIEnv *env, jclass ignored, jlong fd)
165
BY_HANDLE_FILE_INFORMATION info;
167
if (GetFileInformationByHandle((HANDLE) fd, (LPBY_HANDLE_FILE_INFORMATION) &info)) {
168
return (jlong) (((DWORDLONG) info.nFileSizeHigh << 0x20) + info.nFileSizeLow);
170
throwIOException(env, GetLastError());