IO_Util.writeBytes

Excerpt_io_util.c

/*
From http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/native/java/io/io_util.c#l145
*/
void
writeBytes(JNIEnv *env, jobject this, jbyteArray bytes,
           jint off, jint len, jboolean append, jfieldID fid)
{
    jint n;
    char stackBuf[BUF_SIZE];
    char *buf = NULL;
    FD fd;

    if (IS_NULL(bytes)) {
        JNU_ThrowNullPointerException(env, NULL);
        return;
    }

    if (outOfBounds(env, off, len, bytes)) {
        JNU_ThrowByName(env, "java/lang/IndexOutOfBoundsException", NULL);
        return;
    }

    if (len == 0) {
        return;
    } else if (len > BUF_SIZE) {
        buf = malloc(len);
        if (buf == NULL) {
            JNU_ThrowOutOfMemoryError(env, NULL);
            return;
        }
    } else {
        buf = stackBuf;
    }

    (*env)->GetByteArrayRegion(env, bytes, off, len, (jbyte *)buf);

    if (!(*env)->ExceptionOccurred(env)) {
        off = 0;
        while (len > 0) {
            fd = GET_FD(this, fid);
            if (fd == -1) {
                JNU_ThrowIOException(env, "Stream Closed");
                break;
            }
            if (append == JNI_TRUE) {
                n = IO_Append(fd, buf+off, len);
            } else {
                n = IO_Write(fd, buf+off, len);
            }
            if (n == -1) {
                JNU_ThrowIOExceptionWithLastError(env, "Write error");
                break;
            }
            off += n;
            len -= n;
        }
    }
    if (buf != stackBuf) {
        free(buf);
    }
}