/
dispatch.c
3257 lines (3030 loc) · 101 KB
/
dispatch.c
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/*
* @(#)dispatch.c 1.9 98/03/22
*
* Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
* Copyright (c) 2007-2013 Timothy Wall. All Rights Reserved.
* Copyright (c) 2007 Wayne Meissner. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* <p/>
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
#if defined(_WIN32)
#ifdef _MSC_VER
#pragma warning( disable : 4201 ) /* nameless struct/union (jni_md.h) */
#endif
#ifndef UNICODE
#define UNICODE
#endif
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <psapi.h>
#define STRTYPE wchar_t*
#define NAME2CSTR(ENV,JSTR) newWideCString(ENV,JSTR)
#ifdef _WIN32_WCE
#include <tlhelp32.h>
#define DEFAULT_LOAD_OPTS 0 /* altered search path unsupported on CE */
#undef GetProcAddress
#define GetProcAddress GetProcAddressA
#else
/* See http://msdn.microsoft.com/en-us/library/ms682586(VS.85).aspx:
* "Note that the standard search strategy and the alternate search strategy
* specified by LoadLibraryEx with LOAD_WITH_ALTERED_SEARCH_PATH differ in
* just one way: The standard search begins in the calling application's
* directory, and the alternate search begins in the directory of the
* executable module that LoadLibraryEx is loading."
*/
#define DEFAULT_LOAD_OPTS LOAD_WITH_ALTERED_SEARCH_PATH
#endif
#define LOAD_LIBRARY(NAME,OPTS) (NAME ? LoadLibraryExW(NAME, NULL, OPTS) : GetModuleHandleW(NULL))
#define LOAD_ERROR(BUF,LEN) w32_format_error(GetLastError(), BUF, LEN)
#define STR_ERROR(CODE,BUF,LEN) w32_format_error(CODE, BUF, LEN)
#define FREE_LIBRARY(HANDLE) (((HANDLE)==GetModuleHandleW(NULL) || FreeLibrary(HANDLE))?0:-1)
#define FIND_ENTRY(HANDLE, NAME) w32_find_entry(env, HANDLE, NAME)
#else
#include <dlfcn.h>
#include <errno.h>
#define STRTYPE char*
#ifdef __APPLE__
#define NAME2CSTR(ENV,JSTR) newCStringUTF8(ENV,JSTR)
#else
#define NAME2CSTR(ENV,JSTR) newCString(ENV,JSTR)
#endif
#define DEFAULT_LOAD_OPTS (RTLD_LAZY|RTLD_GLOBAL)
#define LOAD_LIBRARY(NAME,OPTS) dlopen(NAME, OPTS)
#define LOAD_ERROR(BUF,LEN) (snprintf(BUF, LEN, "%s", dlerror()), BUF)
#define STR_ERROR(CODE,BUF,LEN) (strerror_r(CODE, BUF, LEN), BUF)
#define FREE_LIBRARY(HANDLE) dlclose(HANDLE)
#define FIND_ENTRY(HANDLE, NAME) dlsym(HANDLE, NAME)
#endif
#ifdef _AIX
#pragma alloca
#undef LOAD_LIBRARY
#define DEFAULT_LOAD_OPTS (RTLD_MEMBER| RTLD_LAZY | RTLD_GLOBAL)
#define LOAD_LIBRARY(NAME,OPTS) dlopen(NAME, OPTS)
#endif
#include <stdlib.h>
// Force XSI-compliant strerror_r (http://unixhelp.ed.ac.uk/CGI/man-cgi?strerror)
#define _XOPEN_SOURCE 600
#include <string.h>
#include <wchar.h>
#include <jni.h>
#ifndef NO_JAWT
#include <jawt.h>
#include <jawt_md.h>
#endif
#include "dispatch.h"
/* Native memory fault protection */
#ifdef HAVE_PROTECTION
#define PROTECT is_protected()
#endif
#include "protect.h"
#define ON_ERROR() throwByName(env, EError, "Invalid memory access")
#define PSTART() PROTECTED_START()
#define PEND() PROTECTED_END(ON_ERROR())
#ifdef HAVE_PROTECTION
static int _protect;
#undef PROTECT
#define PROTECT _protect
#endif
#ifdef __cplusplus
extern "C" {
#endif
#ifdef _WIN32
static char*
w32_format_error(int error, char* buf, int len) {
wchar_t* wbuf = NULL;
int wlen =
FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS|FORMAT_MESSAGE_ALLOCATE_BUFFER,
NULL, error, 0, (LPWSTR)&wbuf, 0, NULL);
if (wlen > 0) {
WideCharToMultiByte(CP_UTF8, 0, wbuf, wlen+1, buf, len, NULL, NULL);
}
else {
*buf = 0;
}
if (wbuf) {
LocalFree(wbuf);
}
return buf;
}
static HANDLE
w32_find_entry(JNIEnv* env, HANDLE handle, const char* funname) {
void* func = NULL;
if (handle != GetModuleHandle(NULL)) {
func = GetProcAddress(handle, funname);
}
else {
#if defined(_WIN32_WCE)
/* CE has no EnumProcessModules, have to use an alternate API */
HANDLE snapshot;
if ((snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, 0)) != INVALID_HANDLE_VALUE) {
MODULEENTRY32 moduleInfo;
moduleInfo.dwSize = sizeof(moduleInfo);
if (Module32First(snapshot, &moduleInfo)) {
do {
if ((func = (void *) GetProcAddress(moduleInfo.hModule, funname))) {
break;
}
} while (Module32Next(snapshot, &moduleInfo));
}
CloseToolhelp32Snapshot(snapshot);
}
#else
HANDLE cur_proc = GetCurrentProcess ();
HMODULE *modules;
DWORD needed, i;
if (!EnumProcessModules (cur_proc, NULL, 0, &needed)) {
fail:
throwByName(env, EError, "Unexpected error enumerating modules");
return 0;
}
modules = (HMODULE*) alloca (needed);
if (!EnumProcessModules (cur_proc, modules, needed, &needed)) {
goto fail;
}
for (i = 0; i < needed / sizeof (HMODULE); i++) {
if ((func = (void *) GetProcAddress (modules[i], funname))) {
break;
}
}
#endif
}
return func;
}
#endif
#define MEMCPY(D,S,L) do { \
PSTART(); memcpy(D,S,L); PEND(); \
} while(0)
#define MEMSET(D,C,L) do { \
PSTART(); memset(D,C,L); PEND(); \
} while(0)
#define MASK_CC com_sun_jna_Function_MASK_CC
#define THROW_LAST_ERROR com_sun_jna_Function_THROW_LAST_ERROR
static jboolean preserve_last_error;
/* Cached class, field and method IDs */
static jclass classObject;
static jclass classClass;
static jclass classMethod;
static jclass classVoid, classPrimitiveVoid;
static jclass classBoolean, classPrimitiveBoolean;
static jclass classByte, classPrimitiveByte;
static jclass classCharacter, classPrimitiveCharacter;
static jclass classShort, classPrimitiveShort;
static jclass classInteger, classPrimitiveInteger;
static jclass classLong, classPrimitiveLong;
static jclass classFloat, classPrimitiveFloat;
static jclass classDouble, classPrimitiveDouble;
static jclass classString, classWString;
#ifndef NO_NIO_BUFFERS
static jclass classBuffer;
static jclass classByteBuffer;
static jclass classCharBuffer;
static jclass classShortBuffer;
static jclass classIntBuffer;
static jclass classLongBuffer;
static jclass classFloatBuffer;
static jclass classDoubleBuffer;
#endif /* NO_NIO_BUFFERS */
static jclass classPointer;
static jclass classNative;
static jclass classStructure;
static jclass classStructureByValue;
static jclass classCallback;
static jclass classCallbackReference;
static jclass classAttachOptions;
static jclass classNativeMapped;
static jclass classIntegerType;
static jclass classPointerType;
static jclass class_ffi_callback;
static jmethodID MID_Class_getComponentType;
static jmethodID MID_Object_toString;
static jmethodID MID_String_getBytes;
static jmethodID MID_String_getBytes2;
static jmethodID MID_String_toCharArray;
static jmethodID MID_String_init_bytes;
static jmethodID MID_Method_getReturnType;
static jmethodID MID_Method_getParameterTypes;
static jmethodID MID_Long_init;
static jmethodID MID_Integer_init;
static jmethodID MID_Short_init;
static jmethodID MID_Character_init;
static jmethodID MID_Byte_init;
static jmethodID MID_Boolean_init;
static jmethodID MID_Float_init;
static jmethodID MID_Double_init;
#ifndef NO_NIO_BUFFERS
static jmethodID MID_Buffer_position;
static jmethodID MID_ByteBuffer_array;
static jmethodID MID_ByteBuffer_arrayOffset;
static jmethodID MID_CharBuffer_array;
static jmethodID MID_CharBuffer_arrayOffset;
static jmethodID MID_ShortBuffer_array;
static jmethodID MID_ShortBuffer_arrayOffset;
static jmethodID MID_IntBuffer_array;
static jmethodID MID_IntBuffer_arrayOffset;
static jmethodID MID_LongBuffer_array;
static jmethodID MID_LongBuffer_arrayOffset;
static jmethodID MID_FloatBuffer_array;
static jmethodID MID_FloatBuffer_arrayOffset;
static jmethodID MID_DoubleBuffer_array;
static jmethodID MID_DoubleBuffer_arrayOffset;
#endif /* NO_NIO_BUFFERS */
static jmethodID MID_Pointer_init;
static jmethodID MID_Native_fromNative;
static jmethodID MID_Native_nativeType;
static jmethodID MID_Native_toNativeTypeMapped;
static jmethodID MID_Native_fromNativeTypeMapped;
static jmethodID MID_Structure_getTypeInfo;
static jmethodID MID_Structure_newInstance;
static jmethodID MID_Structure_read;
static jmethodID MID_Structure_write;
static jmethodID MID_CallbackReference_getCallback;
static jmethodID MID_CallbackReference_getFunctionPointer;
static jmethodID MID_CallbackReference_getNativeString;
static jmethodID MID_CallbackReference_initializeThread;
static jmethodID MID_NativeMapped_toNative;
static jmethodID MID_WString_init;
static jmethodID MID_ToNativeConverter_nativeType;
static jmethodID MID_ffi_callback_invoke;
static jfieldID FID_Boolean_value;
static jfieldID FID_Byte_value;
static jfieldID FID_Short_value;
static jfieldID FID_Character_value;
static jfieldID FID_Integer_value;
static jfieldID FID_Long_value;
static jfieldID FID_Float_value;
static jfieldID FID_Double_value;
static jfieldID FID_Pointer_peer;
static jfieldID FID_Structure_memory;
static jfieldID FID_Structure_typeInfo;
static jfieldID FID_IntegerType_value;
static jfieldID FID_PointerType_pointer;
/* Value of System property jna.encoding. */
static const char* jna_encoding = NULL;
/* Forward declarations */
static char* newCString(JNIEnv *env, jstring jstr);
static char* newCStringUTF8(JNIEnv *env, jstring jstr);
static char* newCStringEncoding(JNIEnv *env, jstring jstr, const char* encoding);
static wchar_t* newWideCString(JNIEnv *env, jstring jstr);
#ifndef NO_NIO_BUFFERS
static void* getBufferArray(JNIEnv*, jobject, jobject*, void **, void **);
static void* getDirectBufferAddress(JNIEnv*, jobject);
#endif
static char getArrayComponentType(JNIEnv *, jobject);
static ffi_type* getStructureType(JNIEnv *, jobject);
typedef void (JNICALL* release_t)(JNIEnv*,jarray,void*,jint);
#if 0
/** Invokes System.err.println (for debugging only). */
static void
println(JNIEnv* env, const char* msg) {
jclass cls = (*env)->FindClass(env, "java/lang/System");
jfieldID fid = (*env)->GetStaticFieldID(env, cls, "err",
"Ljava/io/PrintStream;");
jobject err = (*env)->GetStaticObjectField(env, cls, fid);
jclass pscls = (*env)->FindClass(env, "java/io/PrintStream");
jmethodID mid = (*env)->GetMethodID(env, pscls, "println",
"(Ljava/lang/String;)V");
jstring str = newJavaString(env, msg, JNI_FALSE);
(*env)->CallObjectMethod(env, err, mid, str);
}
#endif
/** Throw an exception by name */
void
throwByName(JNIEnv *env, const char *name, const char *msg)
{
jclass cls;
(*env)->ExceptionClear(env);
cls = (*env)->FindClass(env, name);
if (cls != NULL) { /* Otherwise an exception has already been thrown */
(*env)->ThrowNew(env, cls, msg);
/* It's a good practice to clean up the local references. */
(*env)->DeleteLocalRef(env, cls);
}
}
/** Translate FFI errors into exceptions. */
jboolean
ffi_error(JNIEnv* env, const char* op, ffi_status status) {
char msg[256];
switch(status) {
case FFI_BAD_ABI:
snprintf(msg, sizeof(msg), "%s: Invalid calling convention", op);
throwByName(env, EIllegalArgument, msg);
return JNI_TRUE;
case FFI_BAD_TYPEDEF:
snprintf(msg, sizeof(msg),
"%s: Invalid structure definition (native typedef error)", op);
throwByName(env, EIllegalArgument, msg);
return JNI_TRUE;
default:
snprintf(msg, sizeof(msg), "%s failed (%d)", op, status);
throwByName(env, EError, msg);
return JNI_TRUE;
case FFI_OK:
return JNI_FALSE;
}
}
/* invoke the real native function */
static void
dispatch(JNIEnv *env, void* func, jint flags, jobjectArray arr,
ffi_type *ffi_return_type, void *resP)
{
int i, nargs;
jvalue* c_args;
char array_pt;
struct _array_elements {
jobject array;
void *elems;
release_t release;
} *array_elements;
volatile int array_count = 0;
ffi_cif cif;
ffi_type** ffi_types;
void** ffi_values;
ffi_abi abi;
ffi_status status;
char msg[128];
callconv_t callconv = flags & MASK_CC;
const char* volatile throw_type = NULL;
const char* volatile throw_msg = NULL;
nargs = (*env)->GetArrayLength(env, arr);
if (nargs > MAX_NARGS) {
snprintf(msg, sizeof(msg), "Too many arguments (max %ld)", MAX_NARGS);
throwByName(env, EUnsupportedOperation, msg);
return;
}
c_args = (jvalue*)alloca(nargs * sizeof(jvalue));
array_elements = (struct _array_elements*)
alloca(nargs * sizeof(struct _array_elements));
ffi_types = (ffi_type**)alloca(nargs * sizeof(ffi_type*));
ffi_values = (void**)alloca(nargs * sizeof(void*));
for (i = 0; i < nargs; i++) {
jobject arg = (*env)->GetObjectArrayElement(env, arr, i);
if (arg == NULL) {
c_args[i].l = NULL;
ffi_types[i] = &ffi_type_pointer;
ffi_values[i] = &c_args[i].l;
}
else if ((*env)->IsInstanceOf(env, arg, classBoolean)) {
c_args[i].i = (*env)->GetBooleanField(env, arg, FID_Boolean_value);
ffi_types[i] = &ffi_type_sint32;
ffi_values[i] = &c_args[i].i;
}
else if ((*env)->IsInstanceOf(env, arg, classByte)) {
c_args[i].b = (*env)->GetByteField(env, arg, FID_Byte_value);
ffi_types[i] = &ffi_type_sint8;
ffi_values[i] = &c_args[i].b;
}
else if ((*env)->IsInstanceOf(env, arg, classShort)) {
c_args[i].s = (*env)->GetShortField(env, arg, FID_Short_value);
ffi_types[i] = &ffi_type_sint16;
ffi_values[i] = &c_args[i].s;
}
else if ((*env)->IsInstanceOf(env, arg, classCharacter)) {
if (sizeof(wchar_t) == 2) {
c_args[i].c = (*env)->GetCharField(env, arg, FID_Character_value);
ffi_types[i] = &ffi_type_uint16;
ffi_values[i] = &c_args[i].c;
}
else if (sizeof(wchar_t) == 4) {
c_args[i].i = (*env)->GetCharField(env, arg, FID_Character_value);
ffi_types[i] = &ffi_type_uint32;
ffi_values[i] = &c_args[i].i;
}
else {
snprintf(msg, sizeof(msg), "Unsupported wchar_t size (%d)", (int)sizeof(wchar_t));
throw_type = EUnsupportedOperation;
throw_msg = msg;
goto cleanup;
}
}
else if ((*env)->IsInstanceOf(env, arg, classInteger)) {
c_args[i].i = (*env)->GetIntField(env, arg, FID_Integer_value);
ffi_types[i] = &ffi_type_sint32;
ffi_values[i] = &c_args[i].i;
}
else if ((*env)->IsInstanceOf(env, arg, classLong)) {
c_args[i].j = (*env)->GetLongField(env, arg, FID_Long_value);
ffi_types[i] = &ffi_type_sint64;
ffi_values[i] = &c_args[i].j;
}
else if ((*env)->IsInstanceOf(env, arg, classFloat)) {
c_args[i].f = (*env)->GetFloatField(env, arg, FID_Float_value);
ffi_types[i] = &ffi_type_float;
ffi_values[i] = &c_args[i].f;
}
else if ((*env)->IsInstanceOf(env, arg, classDouble)) {
c_args[i].d = (*env)->GetDoubleField(env, arg, FID_Double_value);
ffi_types[i] = &ffi_type_double;
ffi_values[i] = &c_args[i].d;
}
else if ((*env)->IsInstanceOf(env, arg, classPointer)) {
c_args[i].l = getNativeAddress(env, arg);
ffi_types[i] = &ffi_type_pointer;
ffi_values[i] = &c_args[i].l;
}
else if ((*env)->IsInstanceOf(env, arg, classStructure)) {
c_args[i].l = getStructureAddress(env, arg);
ffi_types[i] = getStructureType(env, arg);
ffi_values[i] = c_args[i].l;
if (!ffi_types[i]) {
snprintf(msg, sizeof(msg),
"Structure type info not initialized at argument %d", i);
throw_type = EIllegalState;
throw_msg = msg;
goto cleanup;
}
}
#ifndef NO_NIO_BUFFERS
else if ((*env)->IsInstanceOf(env, arg, classBuffer)) {
c_args[i].l = getDirectBufferAddress(env, arg);
ffi_types[i] = &ffi_type_pointer;
ffi_values[i] = &c_args[i].l;
if (c_args[i].l == NULL) {
c_args[i].l =
getBufferArray(env, arg, &array_elements[array_count].array,
&array_elements[array_count].elems,
(void**)&array_elements[array_count].release);
if (c_args[i].l == NULL) {
throw_type = EIllegalArgument;
throw_msg = "Buffer arguments must be direct or have a primitive backing array";
goto cleanup;
}
++array_count;
}
}
#endif /* NO_NIO_BUFFERS */
else if ((array_pt = getArrayComponentType(env, arg)) != 0
&& array_pt != 'L') {
void *ptr = NULL;
release_t release = NULL;
#define GET_ELEMS(TYPE) do {ptr=(*env)->Get##TYPE##ArrayElements(env,arg,NULL); release=(void*)(*env)->Release##TYPE##ArrayElements; }while(0)
switch(array_pt) {
case 'Z': GET_ELEMS(Boolean); break;
case 'B': GET_ELEMS(Byte); break;
case 'C': GET_ELEMS(Char); break;
case 'S': GET_ELEMS(Short); break;
case 'I': GET_ELEMS(Int); break;
case 'J': GET_ELEMS(Long); break;
case 'F': GET_ELEMS(Float); break;
case 'D': GET_ELEMS(Double); break;
}
if (!ptr) {
throw_type = EOutOfMemory;
throw_msg = "Could not obtain memory for primitive buffer";
goto cleanup;
}
c_args[i].l = ptr;
ffi_types[i] = &ffi_type_pointer;
ffi_values[i] = &c_args[i].l;
array_elements[array_count].array = arg;
array_elements[array_count].elems = ptr;
array_elements[array_count++].release = release;
}
else {
// Anything else, pass directly as a pointer
c_args[i].l = (void*)arg;
ffi_types[i] = &ffi_type_pointer;
ffi_values[i] = &c_args[i].l;
}
}
switch (callconv) {
case CALLCONV_C:
abi = FFI_DEFAULT_ABI;
break;
#ifdef _WIN32
case CALLCONV_STDCALL:
#if defined(_WIN64) || defined(_WIN32_WCE)
// Ignore requests for stdcall on win64/wince
abi = FFI_DEFAULT_ABI;
#else
abi = FFI_STDCALL;
#endif
break;
#endif // _WIN32
default:
snprintf(msg, sizeof(msg),
"Unrecognized calling convention: %d", (int)callconv);
throw_type = EIllegalArgument;
throw_msg = msg;
goto cleanup;
}
status = ffi_prep_cif(&cif, abi, nargs, ffi_return_type, ffi_types);
if (!ffi_error(env, "Native call setup", status)) {
PSTART();
if (flags & THROW_LAST_ERROR) {
SET_LAST_ERROR(0);
}
ffi_call(&cif, FFI_FN(func), resP, ffi_values);
if (flags & THROW_LAST_ERROR) {
int error = GET_LAST_ERROR();
if (error) {
char emsg[1024];
snprintf(msg, sizeof(msg), "[%d]%s", error, STR_ERROR(error, emsg, sizeof(emsg)));
throw_type = ELastError;
throw_msg = msg;
}
}
else if (preserve_last_error) {
JNA_set_last_error(GET_LAST_ERROR());
}
PROTECTED_END(do { throw_type=EError;throw_msg="Invalid memory access";} while(0));
}
cleanup:
// Release array elements
for (i=0;i < array_count;i++) {
array_elements[i].release(env, array_elements[i].array,
array_elements[i].elems, 0);
}
// Must raise any exception *after* all other JNI operations
if (throw_type) {
throwByName(env, throw_type, throw_msg);
}
}
/** Copy characters from the Java character array into native memory. */
static void
getChars(JNIEnv* env, wchar_t* volatile dst, jcharArray chars, volatile jint off, volatile jint len) {
PSTART();
if (sizeof(jchar) == sizeof(wchar_t)) {
(*env)->GetCharArrayRegion(env, chars, off, len, (jchar*)dst);
}
else {
jchar* buf;
int count = len > 1000 ? 1000 : len;
buf = (jchar *)alloca(count * sizeof(jchar));
if (!buf) {
throwByName(env, EOutOfMemory, "Can't read characters");
}
else {
while (len > 0) {
int i;
(*env)->GetCharArrayRegion(env, chars, off, count, buf);
for (i=0;i < count;i++) {
dst[i] = (wchar_t)buf[i];
}
dst += count;
off += count;
len -= count;
if (count > len) count = len;
}
}
}
PEND();
}
static void
setChars(JNIEnv* env, wchar_t* src, jcharArray chars, volatile jint off, volatile jint len) {
jchar* buf = (jchar*)src;
PSTART();
if (sizeof(jchar) == sizeof(wchar_t)) {
(*env)->SetCharArrayRegion(env, chars, off, len, buf);
}
else {
int count = len > 1000 ? 1000 : len;
buf = (jchar *)alloca(count * sizeof(jchar));
if (!buf) {
throwByName(env, EOutOfMemory, "Can't write characters");
}
else {
while (len > 0) {
int i;
for (i=0;i < count;i++) {
buf[i] = (jchar)src[off+i];
}
(*env)->SetCharArrayRegion(env, chars, off, count, buf);
off += count;
len -= count;
if (count > len) count = len;
}
}
}
PEND();
}
/* Translates a Java string to a C string using the String.getBytes
* method, which uses default platform encoding.
*/
static char *
newCString(JNIEnv *env, jstring jstr)
{
jbyteArray bytes = 0;
char *result = NULL;
bytes = (*env)->CallObjectMethod(env, jstr, MID_String_getBytes);
if (!(*env)->ExceptionCheck(env)) {
jint len = (*env)->GetArrayLength(env, bytes);
result = (char *)malloc(len + 1);
if (result == NULL) {
(*env)->DeleteLocalRef(env, bytes);
throwByName(env, EOutOfMemory, "Can't allocate C string");
return NULL;
}
(*env)->GetByteArrayRegion(env, bytes, 0, len, (jbyte *)result);
result[len] = 0; /* NUL-terminate */
}
(*env)->DeleteLocalRef(env, bytes);
return result;
}
/* Translates a Java string to a C string using the String.getBytes("UTF8")
* method, which uses UTF8 encoding.
*/
static char *
newCStringUTF8(JNIEnv *env, jstring jstr)
{
return newCStringEncoding(env, jstr, "UTF8");
}
static char*
newCStringEncoding(JNIEnv *env, jstring jstr, const char* encoding)
{
jbyteArray bytes = 0;
char *result = NULL;
if (!encoding) return newCString(env, jstr);
bytes = (*env)->CallObjectMethod(env, jstr, MID_String_getBytes2,
newJavaString(env, encoding, JNI_FALSE));
if (!(*env)->ExceptionCheck(env)) {
jint len = (*env)->GetArrayLength(env, bytes);
result = (char *)malloc(len + 1);
if (result == NULL) {
(*env)->DeleteLocalRef(env, bytes);
throwByName(env, EOutOfMemory, "Can't allocate C string");
return NULL;
}
(*env)->GetByteArrayRegion(env, bytes, 0, len, (jbyte *)result);
result[len] = 0; /* NUL-terminate */
}
(*env)->DeleteLocalRef(env, bytes);
return result;
}
/* Translates a Java string to a wide C string using the String.toCharArray
* method.
*/
// TODO: are any encoding changes required?
static wchar_t *
newWideCString(JNIEnv *env, jstring str)
{
jcharArray chars = 0;
wchar_t *result = NULL;
chars = (*env)->CallObjectMethod(env, str, MID_String_toCharArray);
if (!(*env)->ExceptionCheck(env)) {
jint len = (*env)->GetArrayLength(env, chars);
result = (wchar_t *)malloc(sizeof(wchar_t) * (len + 1));
if (result == NULL) {
(*env)->DeleteLocalRef(env, chars);
throwByName(env, EOutOfMemory, "Can't allocate wide C string");
return NULL;
}
// TODO: ensure proper encoding conversion from jchar to native wchar_t
getChars(env, result, chars, 0, len);
if ((*env)->ExceptionCheck(env)) {
free((void *)result);
result = NULL;
}
else {
result[len] = 0; /* NUL-terminate */
}
}
(*env)->DeleteLocalRef(env, chars);
return result;
}
jobject
newJavaWString(JNIEnv *env, const wchar_t* ptr) {
jstring s = newJavaString(env, (const char*)ptr, JNI_TRUE);
return (*env)->NewObject(env, classWString, MID_WString_init, s);
}
/* Constructs a Java string from a char array (using the String(byte [])
* constructor, which uses default local encoding) or a short array (using the
* String(char[]) ctor, which uses the character values unmodified).
*/
jstring
newJavaString(JNIEnv *env, const char *ptr, jboolean wide)
{
volatile jstring result = 0;
PSTART();
if (ptr) {
if (wide) {
// TODO: proper conversion from native wchar_t to jchar, if any
jsize len = (int)wcslen((const wchar_t*)ptr);
if (sizeof(jchar) != sizeof(wchar_t)) {
// NOTE: while alloca may succeed here, writing to the stack
// memory may fail with really large buffers
jchar* buf = (jchar*)malloc(len * sizeof(jchar));
if (!buf) {
throwByName(env, EOutOfMemory, "Can't allocate space for conversion to Java String");
}
else {
int i;
for (i=0;i < len;i++) {
buf[i] = *((const wchar_t*)ptr + i);
}
result = (*env)->NewString(env, buf, len);
free((void*)buf);
}
}
else {
result = (*env)->NewString(env, (const jchar*)ptr, len);
}
}
else {
jbyteArray bytes = 0;
int len = (int)strlen(ptr);
bytes = (*env)->NewByteArray(env, len);
if (bytes != 0) {
(*env)->SetByteArrayRegion(env, bytes, 0, len, (jbyte *)ptr);
result = (*env)->NewObject(env, classString,
MID_String_init_bytes, bytes);
(*env)->DeleteLocalRef(env, bytes);
}
}
}
PEND();
return result;
}
jobject
newJavaPointer(JNIEnv *env, void *p)
{
jobject obj = NULL;
if (p != NULL) {
obj = (*env)->NewObject(env, classPointer, MID_Pointer_init, A2L(p));
}
return obj;
}
jobject
newJavaStructure(JNIEnv *env, void *data, jclass type)
{
if (data != NULL) {
volatile jobject obj = (*env)->CallStaticObjectMethod(env, classStructure, MID_Structure_newInstance, type, A2L(data));
if (obj == NULL) {
fprintf(stderr, "JNA: failed to create structure\n");
}
return obj;
}
return NULL;
}
jobject
newJavaCallback(JNIEnv* env, void* fptr, jclass type)
{
if (fptr != NULL) {
jobject ptr = newJavaPointer(env, fptr);
return (*env)->CallStaticObjectMethod(env, classCallbackReference,
MID_CallbackReference_getCallback,
type, ptr, JNI_TRUE);
}
return NULL;
}
void*
getNativeString(JNIEnv* env, jstring s, jboolean wide) {
if (s != NULL) {
jobject ptr = (*env)->CallStaticObjectMethod(env, classCallbackReference,
MID_CallbackReference_getNativeString,
s, wide);
if (!(*env)->ExceptionCheck(env)) {
return getNativeAddress(env, ptr);
}
}
return NULL;
}
int
get_conversion_flag(JNIEnv* env, jclass cls) {
int type = get_jtype(env, cls);
if (type == 's') {
return CVT_STRUCTURE_BYVAL;
}
if (type == '*') {
if ((*env)->IsAssignableFrom(env, cls, classPointer)) {
return CVT_POINTER;
}
if ((*env)->IsAssignableFrom(env, cls, classStructure)) {
return CVT_STRUCTURE;
}
if ((*env)->IsAssignableFrom(env, cls, classString)) {
return CVT_STRING;
}
if ((*env)->IsAssignableFrom(env, cls, classWString)) {
return CVT_WSTRING;
}
if ((*env)->IsAssignableFrom(env, cls, classCallback)) {
return CVT_CALLBACK;
}
if ((*env)->IsAssignableFrom(env, cls, classIntegerType)) {
return CVT_INTEGER_TYPE;
}
if ((*env)->IsAssignableFrom(env, cls, classPointerType)) {
return CVT_POINTER_TYPE;
}
if ((*env)->IsAssignableFrom(env, cls, classNativeMapped)) {
return CVT_NATIVE_MAPPED;
}
}
return CVT_DEFAULT;
}
int
get_jtype_from_ffi_type(ffi_type* type) {
switch(type->type) {
// FIXME aliases 'C' on *nix; this will cause problems if anyone
// ever installs a type mapper for char/Character (not a common arg type)
case FFI_TYPE_UINT32: return 'Z';
case FFI_TYPE_SINT8: return 'B';
case FFI_TYPE_SINT16: return 'S';
case FFI_TYPE_UINT16: return 'C';
case FFI_TYPE_SINT32: return 'I';
case FFI_TYPE_SINT64: return 'J';
case FFI_TYPE_FLOAT: return 'F';
case FFI_TYPE_DOUBLE: return 'D';
default: return '*';
}
}
int
get_jtype(JNIEnv* env, jclass cls) {
if ((*env)->IsSameObject(env, classVoid, cls)
|| (*env)->IsSameObject(env, classPrimitiveVoid, cls))
return 'V';
if ((*env)->IsSameObject(env, classBoolean, cls)
|| (*env)->IsSameObject(env, classPrimitiveBoolean, cls))
return 'Z';
if ((*env)->IsSameObject(env, classByte, cls)
|| (*env)->IsSameObject(env, classPrimitiveByte, cls))
return 'B';
if ((*env)->IsSameObject(env, classCharacter, cls)
|| (*env)->IsSameObject(env, classPrimitiveCharacter, cls))
return 'C';
if ((*env)->IsSameObject(env,classShort, cls)
|| (*env)->IsSameObject(env, classPrimitiveShort, cls))
return 'S';
if ((*env)->IsSameObject(env, classInteger, cls)
|| (*env)->IsSameObject(env, classPrimitiveInteger, cls))
return 'I';
if ((*env)->IsSameObject(env, classLong, cls)
|| (*env)->IsSameObject(env, classPrimitiveLong, cls))
return 'J';
if ((*env)->IsSameObject(env, classFloat, cls)
|| (*env)->IsSameObject(env, classPrimitiveFloat, cls))
return 'F';
if ((*env)->IsSameObject(env, classDouble, cls)
|| (*env)->IsSameObject(env, classPrimitiveDouble, cls))
return 'D';
if ((*env)->IsAssignableFrom(env, cls, classStructure)) {
if ((*env)->IsAssignableFrom(env, cls, classStructureByValue))
return 's';
return '*';
}
if ((*env)->IsAssignableFrom(env, cls, classPointer)
|| (*env)->IsAssignableFrom(env, cls, classCallback)
|| (*env)->IsAssignableFrom(env, cls, classNativeMapped)
|| (*env)->IsAssignableFrom(env, cls, classWString)
|| (*env)->IsAssignableFrom(env, cls, classString))
return '*';
return -1;
}
jlong
getIntegerTypeValue(JNIEnv* env, jobject obj) {
return (*env)->GetLongField(env, obj, FID_IntegerType_value);
}
void*
getPointerTypeAddress(JNIEnv* env, jobject obj) {
return getNativeAddress(env, (*env)->GetObjectField(env, obj, FID_PointerType_pointer));
}
void *
getStructureAddress(JNIEnv *env, jobject obj) {
if (obj != NULL) {
jobject ptr = (*env)->GetObjectField(env, obj, FID_Structure_memory);
if (!(*env)->ExceptionCheck(env)) {
return getNativeAddress(env, ptr);
}
}
return NULL;
}
void
writeStructure(JNIEnv *env, jobject s) {
if (s != NULL) {
(*env)->CallVoidMethod(env, s, MID_Structure_write);
}
}
void *
getCallbackAddress(JNIEnv *env, jobject obj) {
if (obj != NULL) {
jobject ptr = (*env)->CallStaticObjectMethod(env, classCallbackReference, MID_CallbackReference_getFunctionPointer, obj, JNI_TRUE);
if (!(*env)->ExceptionCheck(env)) {
return getNativeAddress(env, ptr);
}
}
return NULL;
}
jobject
initializeThread(callback* cb, AttachOptions* args) {
JavaVM* jvm = cb->vm;
JNIEnv* env;
jobject group = NULL;
if ((*jvm)->AttachCurrentThread(jvm, (void *)&env, NULL) != JNI_OK) {
fprintf(stderr, "JNA: Can't attach native thread to VM for callback thread initialization\n");
return NULL;
}
(*env)->PushLocalFrame(env, 16);
{
jobject cbobj = (*env)->NewLocalRef(env, cb->object);