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Add write support for RandomAccessFile

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Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This commit is contained in:
Johannes Schindelin 2013-10-17 14:46:00 -05:00
parent 905ddfe613
commit 2c0a1c726d
2 changed files with 54 additions and 0 deletions
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46
classpath/java-io.cpp
View File

@ -898,6 +898,52 @@ Java_java_io_RandomAccessFile_readBytes(JNIEnv* e, jclass, jlong peer,
return (jint)bytesRead;
}
extern "C" JNIEXPORT jint JNICALL
Java_java_io_RandomAccessFile_writeBytes(JNIEnv* e, jclass, jlong peer,
jlong position, jbyteArray buffer,
int offset, int length)
{
#if !defined(WINAPI_FAMILY) || WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
int fd = (int)peer;
if(::lseek(fd, position, SEEK_SET) == -1) {
throwNewErrno(e, "java/io/IOException");
return -1;
}
uint8_t* dst = reinterpret_cast<uint8_t*>
(e->GetPrimitiveArrayCritical(buffer, 0));
int64_t bytesWritten = ::write(fd, dst + offset, length);
e->ReleasePrimitiveArrayCritical(buffer, dst, 0);
if(bytesWritten == -1) {
throwNewErrno(e, "java/io/IOException");
return -1;
}
#else
HANDLE hFile = (HANDLE)peer;
LARGE_INTEGER lPos;
lPos.QuadPart = position;
if(!SetFilePointerEx(hFile, lPos, nullptr, FILE_BEGIN)) {
throwNewErrno(e, "java/io/IOException");
return -1;
}
uint8_t* dst = reinterpret_cast<uint8_t*>
(e->GetPrimitiveArrayCritical(buffer, 0));
DWORD bytesWritten = 0;
if(!WriteFile(hFile, dst + offset, length, &bytesWritten, nullptr)) {
e->ReleasePrimitiveArrayCritical(buffer, dst, 0);
throwNewErrno(e, "java/io/IOException");
return -1;
}
e->ReleasePrimitiveArrayCritical(buffer, dst, 0);
#endif
return (jint)bytesWritten;
}
extern "C" JNIEXPORT void JNICALL
Java_java_io_RandomAccessFile_close(JNIEnv* /* e*/, jclass, jlong peer)
{

8
classpath/java/io/RandomAccessFile.java
View File

@ -131,6 +131,14 @@ public class RandomAccessFile {
private static native int readBytes(long peer, long position, byte[] buffer,
int offset, int length);
public void write(int b) throws IOException {
int count = writeBytes(peer, position, new byte[] { (byte)b }, 0, 1);
if (count > 0) position += count;
}
private static native int writeBytes(long peer, long position, byte[] buffer,
int offset, int length);
public void close() throws IOException {
if (peer != 0) {
close(peer);