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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "PdfUtils.h"
#include "jni.h"
#include <nativehelper/JNIHelp.h>
#include "fpdfview.h"
#define LOG_TAG "PdfUtils"
#include <utils/Log.h>
namespace android {
static int sUnmatchedPdfiumInitRequestCount = 0;
int getBlock(void* param, unsigned long position, unsigned char* outBuffer,
unsigned long size) {
const int fd = reinterpret_cast<intptr_t>(param);
const int readCount = pread(fd, outBuffer, size, position);
if (readCount < 0) {
ALOGE("Cannot read from file descriptor. Error:%d", errno);
return 0;
}
return 1;
}
// Check if the last pdfium command failed and if so, forward the error to java via an exception. If
// this function returns true an exception is pending.
bool forwardPdfiumError(JNIEnv* env) {
long error = FPDF_GetLastError();
switch (error) {
case FPDF_ERR_SUCCESS:
return false;
case FPDF_ERR_FILE:
jniThrowException(env, "java/io/IOException", "file not found or cannot be opened");
break;
case FPDF_ERR_FORMAT:
jniThrowException(env, "java/io/IOException", "file not in PDF format or corrupted");
break;
case FPDF_ERR_PASSWORD:
jniThrowException(env, "java/lang/SecurityException",
"password required or incorrect password");
break;
case FPDF_ERR_SECURITY:
jniThrowException(env, "java/lang/SecurityException", "unsupported security scheme");
break;
case FPDF_ERR_PAGE:
jniThrowException(env, "java/io/IOException", "page not found or content error");
break;
#ifdef PDF_ENABLE_XFA
case FPDF_ERR_XFALOAD:
jniThrowException(env, "java/lang/Exception", "load XFA error");
break;
case FPDF_ERR_XFALAYOUT:
jniThrowException(env, "java/lang/Exception", "layout XFA error");
break;
#endif // PDF_ENABLE_XFA
case FPDF_ERR_UNKNOWN:
default:
jniThrowExceptionFmt(env, "java/lang/Exception", "unknown error %d", error);
}
return true;
}
static void initializeLibraryIfNeeded(JNIEnv* env) {
if (sUnmatchedPdfiumInitRequestCount == 0) {
FPDF_InitLibrary();
}
sUnmatchedPdfiumInitRequestCount++;
}
static void destroyLibraryIfNeeded(JNIEnv* env, bool handleError) {
if (sUnmatchedPdfiumInitRequestCount == 1) {
FPDF_DestroyLibrary();
}
sUnmatchedPdfiumInitRequestCount--;
}
jlong nativeOpen(JNIEnv* env, jclass thiz, jint fd, jlong size) {
initializeLibraryIfNeeded(env);
FPDF_FILEACCESS loader;
loader.m_FileLen = size;
loader.m_Param = reinterpret_cast<void*>(intptr_t(fd));
loader.m_GetBlock = &getBlock;
FPDF_DOCUMENT document = FPDF_LoadCustomDocument(&loader, NULL);
if (!document) {
forwardPdfiumError(env);
destroyLibraryIfNeeded(env, false);
return -1;
}
return reinterpret_cast<jlong>(document);
}
void nativeClose(JNIEnv* env, jclass thiz, jlong documentPtr) {
FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);
FPDF_CloseDocument(document);
destroyLibraryIfNeeded(env, true);
}
jint nativeGetPageCount(JNIEnv* env, jclass thiz, jlong documentPtr) {
FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);
return FPDF_GetPageCount(document);
}
jboolean nativeScaleForPrinting(JNIEnv* env, jclass thiz, jlong documentPtr) {
FPDF_DOCUMENT document = reinterpret_cast<FPDF_DOCUMENT>(documentPtr);
FPDF_BOOL printScaling = FPDF_VIEWERREF_GetPrintScaling(document);
return printScaling ? JNI_TRUE : JNI_FALSE;
}
};
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