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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// 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.
//
// ijar.cpp -- .jar -> _interface.jar tool.
//
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <errno.h>
#include <memory>
#include "third_party/ijar/zip.h"
namespace devtools_ijar {
bool verbose = false;
// Reads a JVM class from classdata_in (of the specified length), and
// writes out a simplified class to classdata_out, advancing the
// pointer. Returns true if the class should be kept.
bool StripClass(u1*& classdata_out, const u1* classdata_in, size_t in_length);
const char* CLASS_EXTENSION = ".class";
const size_t CLASS_EXTENSION_LENGTH = strlen(CLASS_EXTENSION);
// ZipExtractorProcessor that select only .class file and use
// StripClass to generate an interface class, storing as a new file
// in the specified ZipBuilder.
class JarStripperProcessor : public ZipExtractorProcessor {
public:
JarStripperProcessor() {}
virtual ~JarStripperProcessor() {}
virtual void Process(const char* filename, const u4 attr,
const u1* data, const size_t size);
virtual bool Accept(const char* filename, const u4 attr);
private:
// Not owned by JarStripperProcessor, see SetZipBuilder().
ZipBuilder* builder;
public:
// Set the ZipBuilder to add the ijar class to the output zip file.
// This pointer should not be deleted while this class is still in use and
// it should be set before any call to the Process() method.
void SetZipBuilder(ZipBuilder* builder) {
this->builder = builder;
}
};
bool JarStripperProcessor::Accept(const char* filename, const u4 attr) {
const size_t filename_len = strlen(filename);
if (filename_len < CLASS_EXTENSION_LENGTH ||
strcmp(filename + filename_len - CLASS_EXTENSION_LENGTH,
CLASS_EXTENSION) != 0) {
return false;
}
// skip module-info.class files, which don't need stripping
const char* slash = strrchr(filename, '/');
if (slash == NULL) {
slash = filename;
} else {
slash++;
}
if (strcmp(slash, "module-info.class") == 0) {
return false;
}
return true;
}
void JarStripperProcessor::Process(const char* filename, const u4 attr,
const u1* data, const size_t size) {
if (verbose) {
fprintf(stderr, "INFO: StripClass: %s\n", filename);
}
u1* buf = reinterpret_cast<u1*>(malloc(size));
u1* classdata_out = buf;
if (!StripClass(buf, data, size)) {
free(classdata_out);
return;
}
u1* q = builder->NewFile(filename, 0);
size_t out_length = buf - classdata_out;
memcpy(q, classdata_out, out_length);
builder->FinishFile(out_length, false, true);
free(classdata_out);
}
// Opens "file_in" (a .jar file) for reading, and writes an interface
// .jar to "file_out".
void OpenFilesAndProcessJar(const char *file_out, const char *file_in) {
JarStripperProcessor processor;
std::unique_ptr<ZipExtractor> in(ZipExtractor::Create(file_in, &processor));
if (in.get() == NULL) {
fprintf(stderr, "Unable to open Zip file %s: %s\n", file_in,
strerror(errno));
abort();
}
u8 output_length = in->CalculateOutputLength();
std::unique_ptr<ZipBuilder> out(ZipBuilder::Create(file_out, output_length));
if (out.get() == NULL) {
fprintf(stderr, "Unable to open output file %s: %s\n", file_out,
strerror(errno));
abort();
}
processor.SetZipBuilder(out.get());
// Process all files in the zip
if (in->ProcessAll() < 0) {
fprintf(stderr, "%s\n", in->GetError());
abort();
}
// Add dummy file, since javac doesn't like truly empty jars.
if (out->GetNumberFiles() == 0) {
out->WriteEmptyFile("dummy");
}
// Finish writing the output file
if (out->Finish() < 0) {
fprintf(stderr, "%s\n", out->GetError());
abort();
}
// Get all file size
size_t in_length = in->GetSize();
size_t out_length = out->GetSize();
if (verbose) {
fprintf(stderr, "INFO: produced interface jar: %s -> %s (%d%%).\n",
file_in, file_out,
static_cast<int>(100.0 * out_length / in_length));
}
}
} // namespace devtools_ijar
//
// main method
//
static void usage() {
fprintf(stderr, "Usage: ijar [-v] x.jar [x_interface.jar>]\n");
fprintf(stderr, "Creates an interface jar from the specified jar file.\n");
exit(1);
}
int main(int argc, char **argv) {
const char *filename_in = NULL;
const char *filename_out = NULL;
for (int ii = 1; ii < argc; ++ii) {
if (strcmp(argv[ii], "-v") == 0) {
devtools_ijar::verbose = true;
} else if (filename_in == NULL) {
filename_in = argv[ii];
} else if (filename_out == NULL) {
filename_out = argv[ii];
} else {
usage();
}
}
if (filename_in == NULL) {
usage();
}
// Guess output filename from input:
char filename_out_buf[PATH_MAX];
if (filename_out == NULL) {
size_t len = strlen(filename_in);
if (len > 4 && strncmp(filename_in + len - 4, ".jar", 4) == 0) {
strcpy(filename_out_buf, filename_in);
strcpy(filename_out_buf + len - 4, "-interface.jar");
filename_out = filename_out_buf;
} else {
fprintf(stderr, "Can't determine output filename since input filename "
"doesn't end with '.jar'.\n");
return 1;
}
}
if (devtools_ijar::verbose) {
fprintf(stderr, "INFO: writing to '%s'.\n", filename_out);
}
devtools_ijar::OpenFilesAndProcessJar(filename_out, filename_in);
return 0;
}
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