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bazel / bazel / 930ee3ca66d710ccf76adbaab38f5974667f897b / . / src / tools / singlejar / output_jar.cc
blob: 80eaede63ac7b6407b18dd64d8196d5d3936b5ba [file] [log] [blame]
// Copyright 2016 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.
/*
* The implementation of the OutputJar methods.
*/
#include "src/tools/singlejar/output_jar.h"
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include "src/tools/singlejar/combiners.h"
#include "src/tools/singlejar/diag.h"
#include "src/tools/singlejar/input_jar.h"
#include "src/tools/singlejar/mapped_file.h"
#include "src/tools/singlejar/options.h"
#include "src/tools/singlejar/zip_headers.h"
#include <zlib.h>
#define TODO(cond, msg) \
if (!(cond)) { \
diag_errx(2, "%s:%d: TODO(asmundak): " msg, __FILE__, __LINE__); \
}
OutputJar::OutputJar()
: options_(nullptr),
file_(nullptr),
outpos_(0),
buffer_(nullptr),
entries_(0),
duplicate_entries_(0),
cen_(nullptr),
cen_size_(0),
cen_capacity_(0),
spring_handlers_("META-INF/spring.handlers"),
spring_schemas_("META-INF/spring.schemas"),
protobuf_meta_handler_("protobuf.meta", false),
manifest_("META-INF/MANIFEST.MF"),
build_properties_("build-data.properties") {
known_members_.emplace(spring_handlers_.filename(),
EntryInfo{&spring_handlers_});
known_members_.emplace(spring_schemas_.filename(),
EntryInfo{&spring_schemas_});
known_members_.emplace(manifest_.filename(), EntryInfo{&manifest_});
known_members_.emplace(protobuf_meta_handler_.filename(),
EntryInfo{&protobuf_meta_handler_});
manifest_.Append(
"Manifest-Version: 1.0\r\n"
"Created-By: singlejar\r\n");
}
static std::string Basename(const std::string& path) {
size_t pos = path.rfind('/');
if (pos == std::string::npos) {
return path;
} else {
return std::string(path, pos + 1);
}
}
int OutputJar::Doit(Options *options) {
if (nullptr != options_) {
diag_errx(1, "%s:%d: Doit() can be called only once.", __FILE__, __LINE__);
}
options_ = options;
// Register the handler for the build-data.properties file unless
// --exclude_build_data is present. Otherwise we do not generate this file,
// and it will be copied from the first source archive containing it.
if (!options_->exclude_build_data) {
known_members_.emplace(build_properties_.filename(),
EntryInfo{&build_properties_});
}
build_properties_.AddProperty("build.target", options_->output_jar.c_str());
if (options_->verbose) {
fprintf(stderr, "combined_file_name=%s\n", options_->output_jar.c_str());
if (!options_->main_class.empty()) {
fprintf(stderr, "main_class=%s\n", options_->main_class.c_str());
}
if (!options_->java_launcher.empty()) {
fprintf(stderr, "java_launcher_file=%s\n",
options_->java_launcher.c_str());
}
fprintf(stderr, "%ld source files\n", options_->input_jars.size());
fprintf(stderr, "%ld manifest lines\n", options_->manifest_lines.size());
}
if (!Open()) {
exit(1);
}
// Copy launcher if it is set.
if (!options_->java_launcher.empty()) {
const char *const launcher_path = options_->java_launcher.c_str();
int in_fd = open(launcher_path, O_RDONLY);
struct stat statbuf;
if (file_ == nullptr || fstat(in_fd, &statbuf)) {
diag_err(1, "%s", launcher_path);
}
// TODO(asmundak): Consider going back to sendfile() or reflink
// (BTRFS_IOC_CLONE/XFS_IOC_CLONE) here. The launcher preamble can
// be very large for targets with many native deps.
ssize_t byte_count = AppendFile(in_fd, 0, statbuf.st_size);
if (byte_count < 0) {
diag_err(1, "%s:%d: Cannot copy %s to %s", __FILE__, __LINE__,
launcher_path, options_->output_jar.c_str());
} else if (byte_count != statbuf.st_size) {
diag_err(1, "%s:%d: Copied only %ld bytes out of %" PRIu64 " from %s",
__FILE__, __LINE__, byte_count, statbuf.st_size, launcher_path);
}
close(in_fd);
if (options_->verbose) {
fprintf(stderr, "Prepended %s (%" PRIu64 " bytes)\n", launcher_path,
statbuf.st_size);
}
}
if (!options_->main_class.empty()) {
build_properties_.AddProperty("main.class", options_->main_class);
manifest_.Append("Main-Class: ");
manifest_.Append(options_->main_class);
manifest_.Append("\r\n");
}
for (auto &manifest_line : options_->manifest_lines) {
if (!manifest_line.empty()) {
manifest_.Append(manifest_line);
if (manifest_line[manifest_line.size() - 1] != '\n') {
manifest_.Append("\r\n");
}
}
}
for (auto &build_info_line : options_->build_info_lines) {
build_properties_.Append(build_info_line);
build_properties_.Append("\n");
}
for (auto &build_info_file : options_->build_info_files) {
MappedFile mapped_file;
if (!mapped_file.Open(build_info_file)) {
diag_err(1, "%s:%d: Bad build info file %s", __FILE__, __LINE__,
build_info_file.c_str());
}
const char *data = reinterpret_cast<const char *>(mapped_file.start());
const char *data_end = reinterpret_cast<const char *>(mapped_file.end());
// TODO(asmundak): this isn't right, we should parse properties file.
while (data < data_end) {
const char *next_data = strchr(static_cast<const char *>(data), '\n');
if (next_data) {
++next_data;
} else {
next_data = data_end;
}
build_properties_.Append(data, next_data - data);
data = next_data;
}
mapped_file.Close();
}
for (auto &rpath : options_->classpath_resources) {
ClasspathResource(Basename(rpath), rpath);
}
for (auto &rdesc : options_->resources) {
// A resource description is either NAME or PATH:NAME
std::size_t colon = rdesc.find_first_of(':');
if (0 == colon) {
diag_errx(1, "%s:%d: Bad resource description %s", __FILE__, __LINE__,
rdesc.c_str());
}
if (std::string::npos == colon) {
ClasspathResource(rdesc, rdesc);
} else {
ClasspathResource(rdesc.substr(colon + 1), rdesc.substr(0, colon));
}
}
// Ready to write zip entries. Decide whether created entries should be
// compressed.
bool compress = options_->force_compression || options_->preserve_compression;
// First, write a directory entry for the META-INF, followed by the manifest
// file, followed by the build properties file.
WriteMetaInf();
manifest_.Append("\r\n");
WriteEntry(manifest_.OutputEntry(compress));
if (!options_->exclude_build_data) {
WriteEntry(build_properties_.OutputEntry(compress));
}
// Then classpath resources.
for (auto &classpath_resource : classpath_resources_) {
bool do_compress = compress;
if (do_compress && !options_->nocompress_suffixes.empty()) {
for (auto &suffix : options_->nocompress_suffixes) {
auto entry_name = classpath_resource->filename();
if (entry_name.length() >= suffix.size() &&
!entry_name.compare(entry_name.length() - suffix.size(),
suffix.size(), suffix)) {
do_compress = false;
break;
}
}
}
// Add parent directory entries.
size_t pos = classpath_resource->filename().find('/');
while (pos != std::string::npos) {
std::string dir(classpath_resource->filename(), 0, pos + 1);
if (NewEntry(dir)) {
WriteDirEntry(dir, nullptr, 0);
}
pos = classpath_resource->filename().find('/', pos + 1);
}
WriteEntry(classpath_resource->OutputEntry(do_compress));
}
// Then copy source files' contents.
for (int ix = 0; ix < options_->input_jars.size(); ++ix) {
if (!AddJar(ix)) {
exit(1);
}
}
// All entries written, write Central Directory and close.
Close();
return 0;
}
OutputJar::~OutputJar() {
if (file_) {
diag_warnx("%s:%d: Close() should be called first", __FILE__, __LINE__);
}
}
// Try to perform I/O in units of this size.
// (128KB is the default max request size for fuse filesystems.)
static const size_t kBufferSize = 128<<10;
bool OutputJar::Open() {
if (file_) {
diag_errx(1, "%s:%d: Cannot open output archive twice", __FILE__, __LINE__);
}
// Set execute bits since we may produce an executable output file.
int fd = open(path(), O_CREAT|O_WRONLY|O_TRUNC, 0777);
if (fd < 0) {
diag_warn("%s:%d: %s", __FILE__, __LINE__, path());
return false;
}
file_ = fdopen(fd, "w");
if (file_ == nullptr) {
diag_warn("%s:%d: fdopen of %s", __FILE__, __LINE__, path());
close(fd);
return false;
}
outpos_ = 0;
buffer_.reset(new char[kBufferSize]);
setbuffer(file_, buffer_.get(), kBufferSize);
if (options_->verbose) {
fprintf(stderr, "Writing to %s\n", path());
}
return true;
}
bool OutputJar::AddJar(int jar_path_index) {
const std::string& input_jar_path = options_->input_jars[jar_path_index];
InputJar input_jar;
if (!input_jar.Open(input_jar_path)) {
return false;
}
const CDH *jar_entry;
const LH *lh;
while ((jar_entry = input_jar.NextEntry(&lh))) {
const char *file_name = jar_entry->file_name();
auto file_name_length = jar_entry->file_name_length();
if (!file_name_length) {
diag_errx(
1, "%s:%d: Bad central directory record in %s at offset 0x%" PRIx64,
__FILE__, __LINE__, input_jar_path.c_str(),
input_jar.CentralDirectoryRecordOffset(jar_entry));
}
// Special files that cannot be handled by looking up known_members_ map:
// * ignore *.SF, *.RSA, *.DSA
// (TODO(asmundak): should this be done only in META-INF?
//
if (ends_with(file_name, file_name_length, ".SF") ||
ends_with(file_name, file_name_length, ".RSA") ||
ends_with(file_name, file_name_length, ".DSA")) {
continue;
}
bool include_entry = true;
if (!options_->include_prefixes.empty()) {
for (auto& prefix : options_->include_prefixes) {
if ((include_entry =
(prefix.size() <= file_name_length &&
0 == strncmp(file_name, prefix.c_str(), prefix.size())))) {
break;
}
}
}
if (!include_entry) {
continue;
}
bool is_file = (file_name[file_name_length - 1] != '/');
if (is_file &&
begins_with(file_name, file_name_length, "META-INF/services/")) {
// The contents of the META-INF/services/<SERVICE> on the output is the
// concatenation of the META-INF/services/<SERVICE> files from all inputs.
std::string service_path(file_name, file_name_length);
if (NewEntry(service_path)) {
// Create a concatenator and add it to the known_members_ map.
// The call to Merge() below will then take care of the rest.
Concatenator *service_handler = new Concatenator(service_path);
service_handlers_.emplace_back(service_handler);
known_members_.emplace(service_path, EntryInfo{service_handler});
}
} else {
ExtraHandler(jar_entry);
}
// Install a new entry unless it is already present. All the plain (non-dir)
// entries that require a combiner have been already installed, so the call
// will add either a directory entry whose handler will ignore subsequent
// duplicates, or an ordinary plain entry, for which we save the index of
// the first input jar (in order to provide diagnostics on duplicate).
auto got =
known_members_.emplace(std::string(file_name, file_name_length),
EntryInfo{is_file ? nullptr : &null_combiner_,
is_file ? jar_path_index: -1});
if (!got.second) {
auto &entry_info = got.first->second;
// Handle special entries (the ones that have a combiner).
if (entry_info.combiner_ != nullptr) {
entry_info.combiner_->Merge(jar_entry, lh);
continue;
}
// Plain file entry. If duplicates are not allowed, bail out. Otherwise
// just ignore this entry.
if (options_->no_duplicates ||
(options_->no_duplicate_classes &&
ends_with(file_name, file_name_length, ".class"))) {
diag_errx(1, "%s:%d: %.*s is present both in %s and %s", __FILE__,
__LINE__, file_name_length, file_name,
options_->input_jars[entry_info.input_jar_index_].c_str(),
input_jar_path.c_str());
} else {
duplicate_entries_++;
continue;
}
}
// For the file entries, decide whether output should be compressed.
if (is_file) {
bool input_compressed =
jar_entry->compression_method() != Z_NO_COMPRESSION;
bool output_compressed =
options_->force_compression ||
(options_->preserve_compression && input_compressed);
if (output_compressed && !options_->nocompress_suffixes.empty()) {
for (auto &suffix : options_->nocompress_suffixes) {
if (file_name_length >= suffix.size() &&
!strncmp(file_name + file_name_length - suffix.size(),
suffix.c_str(), suffix.size())) {
output_compressed = false;
break;
}
}
}
if (input_compressed != output_compressed) {
Concatenator combiner(jar_entry->file_name_string());
if (!combiner.Merge(jar_entry, lh)) {
diag_err(1, "%s:%d: cannot add %.*s", __FILE__, __LINE__,
jar_entry->file_name_length(), jar_entry->file_name());
}
WriteEntry(combiner.OutputEntry(output_compressed));
continue;
}
}
// Now we have to copy:
// local header
// file data
// data descriptor, if present.
off_t copy_from = jar_entry->local_header_offset();
size_t num_bytes = lh->size();
if (jar_entry->no_size_in_local_header()) {
const DDR *ddr = reinterpret_cast<const DDR *>(
lh->data() + jar_entry->compressed_file_size());
num_bytes +=
jar_entry->compressed_file_size() +
ddr->size(
ziph::zfield_has_ext64(jar_entry->compressed_file_size32()),
ziph::zfield_has_ext64(jar_entry->uncompressed_file_size32()));
} else {
num_bytes += lh->compressed_file_size();
}
off_t local_header_offset = Position();
// When normalize_timestamps is set, entry's timestamp is to be set to
// 01/01/1980 00:00:00 (or to 01/01/1980 00:00:02, if an entry is a .class
// file). This is somewhat expensive because we have to copy the local
// header to memory as input jar is memory mapped as read-only. Try to copy
// as little as possible.
uint16_t normalized_time = 0;
const UnixTimeExtraField *lh_field_to_remove = nullptr;
bool fix_timestamp = false;
if (options_->normalize_timestamps) {
if (ends_with(file_name, file_name_length, ".class")) {
normalized_time = 1;
}
lh_field_to_remove = lh->unix_time_extra_field();
fix_timestamp = jar_entry->last_mod_file_date() != 33 ||
jar_entry->last_mod_file_time() != normalized_time ||
lh_field_to_remove != nullptr;
}
if (fix_timestamp) {
uint8_t lh_buffer[512];
size_t lh_size = lh->size();
LH *lh_new = lh_size > sizeof(lh_buffer)
? reinterpret_cast<LH *>(malloc(lh_size))
: reinterpret_cast<LH *>(lh_buffer);
// Remove Unix timestamp field.
if (lh_field_to_remove != nullptr) {
auto from_end = ziph::byte_ptr(lh) + lh->size();
size_t removed_size = lh_field_to_remove->size();
size_t chunk1_size =
ziph::byte_ptr(lh_field_to_remove) - ziph::byte_ptr(lh);
size_t chunk2_size = lh->size() - (chunk1_size + removed_size);
memcpy(lh_new, lh, chunk1_size);
if (chunk2_size) {
memcpy(reinterpret_cast<uint8_t *>(lh_new) + chunk1_size,
from_end - chunk2_size, chunk2_size);
}
lh_new->extra_fields(lh_new->extra_fields(),
lh->extra_fields_length() - removed_size);
} else {
memcpy(lh_new, lh, lh_size);
}
lh_new->last_mod_file_date(33);
lh_new->last_mod_file_time(normalized_time);
// Now write these few bytes and adjust read/write positions accordingly.
if (!WriteBytes(lh_new, lh_new->size())) {
diag_err(1, "%s:%d: Cannot copy modified local header for %.*s",
__FILE__, __LINE__, file_name_length, file_name);
}
copy_from += lh_size;
num_bytes -= lh_size;
if (reinterpret_cast<uint8_t *>(lh_new) != lh_buffer) {
free(lh_new);
}
}
// Do the actual copy.
if (!WriteBytes(input_jar.mapped_start() + copy_from, num_bytes)) {
diag_err(1, "%s:%d: Cannot write %ld bytes of %.*s from %s", __FILE__,
__LINE__, num_bytes, file_name_length, file_name,
input_jar_path.c_str());
}
AppendToDirectoryBuffer(jar_entry, local_header_offset, normalized_time,
fix_timestamp);
++entries_;
}
return input_jar.Close();
}
off_t OutputJar::Position() {
if (file_ == nullptr) {
diag_err(1, "%s:%d: output file is not open", __FILE__, __LINE__);
}
// You'd think this could be "return ftell(file_);", but that
// generates a needless call to lseek. So instead we cache our
// current position in the output.
return outpos_;
}
// Writes an entry. The argument is the pointer to the contiguous block of
// memory containing Local Header for the entry, immediately followed by
// the data. The memory is freed after the data has been written.
void OutputJar::WriteEntry(void *buffer) {
if (buffer == nullptr) {
return;
}
LH *entry = reinterpret_cast<LH *>(buffer);
if (options_->verbose) {
fprintf(stderr, "%-.*s combiner has %lu bytes, %s to %lu\n",
entry->file_name_length(), entry->file_name(),
entry->uncompressed_file_size(),
entry->compression_method() == Z_NO_COMPRESSION ? "copied"
: "compressed",
entry->compressed_file_size());
}
// Set this entry's timestamp.
// MSDOS file timestamp format that Zip uses is described here:
// https://msdn.microsoft.com/en-us/library/9kkf9tah.aspx
// ("32-Bit Windows Time/Date Formats")
if (options_->normalize_timestamps) {
// Regular "normalized" timestamp is 01/01/1980 00:00:00, while for the
// .class file it is 01/01/1980 00:00:02
entry->last_mod_file_date(33);
entry->last_mod_file_time(
ends_with(entry->file_name(), entry->file_name_length(), ".class") ? 1
: 0);
} else {
struct tm tm;
// Time has 2-second resolution, so round up:
time_t t_adjusted = (time(nullptr) + 1) & ~1;
localtime_r(&t_adjusted, &tm);
uint16_t dos_date =
((tm.tm_year - 80) << 9) | ((tm.tm_mon + 1) << 5) | tm.tm_mday;
uint16_t dos_time =
(tm.tm_hour << 11) | (tm.tm_min << 5) | (tm.tm_sec >> 1);
entry->last_mod_file_time(dos_time);
entry->last_mod_file_date(dos_date);
}
uint8_t *data = reinterpret_cast<uint8_t *>(entry);
off_t output_position = Position();
if (!WriteBytes(data, entry->data() + entry->in_zip_size() - data)) {
diag_err(1, "%s:%d: write", __FILE__, __LINE__);
}
// Data written, allocate CDH space and populate CDH.
// Space needed for the CDH varies depending on whether output position field
// fits into 32 bits (we do not handle compressed/uncompressed entry sizes
// exceeding 32 bits at the moment).
uint16_t zip64_size = ziph::zfield_needs_ext64(output_position)
? Zip64ExtraField::space_needed(1)
: 0;
CDH *cdh = reinterpret_cast<CDH *>(
ReserveCdh(sizeof(CDH) + entry->file_name_length() +
entry->extra_fields_length() + zip64_size));
cdh->signature();
// Note: do not set the version to Unix 3.0 spec, otherwise
// unzip will think that 'external_attributes' field contains access mode
cdh->version(20);
cdh->version_to_extract(20); // 2.0
cdh->bit_flag(0x0);
cdh->compression_method(entry->compression_method());
cdh->last_mod_file_time(entry->last_mod_file_time());
cdh->last_mod_file_date(entry->last_mod_file_date());
cdh->crc32(entry->crc32());
TODO(entry->compressed_file_size32() != 0xFFFFFFFF, "Handle Zip64");
cdh->compressed_file_size32(entry->compressed_file_size32());
TODO(entry->uncompressed_file_size32() != 0xFFFFFFFF, "Handle Zip64");
cdh->uncompressed_file_size32(entry->uncompressed_file_size32());
cdh->file_name(entry->file_name(), entry->file_name_length());
cdh->extra_fields(entry->extra_fields(), entry->extra_fields_length());
if (zip64_size > 0) {
Zip64ExtraField *zip64_ef = reinterpret_cast<Zip64ExtraField *>(
cdh->extra_fields() + cdh->extra_fields_length());
zip64_ef->signature();
zip64_ef->attr_count(1);
zip64_ef->attr64(0, output_position);
cdh->local_header_offset32(0xFFFFFFFF);
// Field address argument points to the already existing field,
// so the call just updates the length.
cdh->extra_fields(cdh->extra_fields(),
cdh->extra_fields_length() + zip64_size);
} else {
cdh->local_header_offset32(output_position);
}
cdh->comment_length(0);
cdh->start_disk_nr(0);
cdh->internal_attributes(0);
cdh->external_attributes(0);
++entries_;
free(reinterpret_cast<void *>(entry));
}
void OutputJar::WriteMetaInf() {
std::string path("META-INF/");
// META_INF/ is always the first entry, and as such it should have an extra
// field with the tag 0xCAFE and zero bytes of data. This is not the part of
// the jar file spec, but Unix 'file' utility relies on it to distiguish jar
// file from zip file. See https://bugs.openjdk.java.net/browse/JDK-6808540
const uint8_t extra_fields[] = {0xFE, 0xCA, 0, 0};
const uint16_t n_extra_fields =
sizeof(extra_fields) / sizeof(extra_fields[0]);
WriteDirEntry(path, extra_fields, n_extra_fields);
}
// Writes a directory entry with the given name and extra fields.
void OutputJar::WriteDirEntry(const std::string &name,
const uint8_t *extra_fields,
const uint16_t n_extra_fields) {
size_t lh_size = sizeof(LH) + name.size() + n_extra_fields;
LH *lh = reinterpret_cast<LH *>(malloc(lh_size));
lh->signature();
lh->version(20); // 2.0
lh->bit_flag(0); // TODO(asmundak): should I set UTF8 flag?
lh->compression_method(Z_NO_COMPRESSION);
lh->crc32(0);
lh->compressed_file_size32(0);
lh->uncompressed_file_size32(0);
lh->file_name(name.c_str(), name.size());
lh->extra_fields(extra_fields, n_extra_fields);
known_members_.emplace(name, EntryInfo{&null_combiner_});
WriteEntry(lh);
}
// Create output Central Directory entry for the input jar entry.
void OutputJar::AppendToDirectoryBuffer(const CDH *cdh, off_t lh_pos,
uint16_t normalized_time,
bool fix_timestamp) {
// While copying from the input CDH pointed to by 'cdh', we may need to drop
// Unix timestamp extra field, and we might need to change the number of
// attributes of the Zip64 extra field, or create it, or destroy it if entry's
// position relative to 4G boundary changes.
// The rest of the input CDH is copied.
// 1. Decide if we need to drop UnixTime.
size_t removed_unix_time_field_size = 0;
if (fix_timestamp) {
auto unix_time_field = cdh->unix_time_extra_field();
if (unix_time_field != nullptr) {
removed_unix_time_field_size = unix_time_field->size();
}
}
// 2. Figure out how many attributes input entry has and how many
// the output entry is going to have.
const Zip64ExtraField *zip64_ef = cdh->zip64_extra_field();
const int zip64_attr_count = zip64_ef == nullptr ? 0 : zip64_ef->attr_count();
const bool lh_pos_needs64 = ziph::zfield_needs_ext64(lh_pos);
size_t out_zip64_attr_count;
if (zip64_attr_count > 0) {
out_zip64_attr_count = zip64_attr_count;
// The number of attributes may remain the same, or it may increase or
// decrease by 1, depending on local_header_offset value.
if (ziph::zfield_has_ext64(cdh->local_header_offset32()) !=
lh_pos_needs64) {
if (lh_pos_needs64) {
out_zip64_attr_count += 1;
} else {
out_zip64_attr_count -= 1;
}
}
} else {
out_zip64_attr_count = lh_pos_needs64 ? 1 : 0;
}
const uint16_t zip64_size = Zip64ExtraField::space_needed(zip64_attr_count);
const uint16_t out_zip64_size =
Zip64ExtraField::space_needed(out_zip64_attr_count);
// Allocate output CDH and copy everything but extra fields.
const uint16_t ef_size = cdh->extra_fields_length();
const uint16_t out_ef_size =
(ef_size + out_zip64_size) - (removed_unix_time_field_size + zip64_size);
const size_t out_cdh_size = cdh->size() + out_ef_size - ef_size;
CDH *out_cdh = reinterpret_cast<CDH *>(ReserveCdr(out_cdh_size));
// Calculate ExtraFields boundaries in the input and output entries.
auto ef_begin = reinterpret_cast<const ExtraField *>(cdh->extra_fields());
auto ef_end =
reinterpret_cast<const ExtraField *>(ziph::byte_ptr(ef_begin) + ef_size);
// Copy [cdh..ef_begin) -> [out_cdh..out_ef_begin)
memcpy(out_cdh, cdh, ziph::byte_ptr(ef_begin) - ziph::byte_ptr(cdh));
auto out_ef_begin = reinterpret_cast<ExtraField *>(
const_cast<uint8_t *>(out_cdh->extra_fields()));
auto out_ef_end = reinterpret_cast<ExtraField *>(
reinterpret_cast<uint8_t *>(out_ef_begin) + out_ef_size);
// Copy [ef_end..cdh_end) -> [out_ef_end..out_cdh_end)
memcpy(out_ef_end, ef_end,
ziph::byte_ptr(cdh) + cdh->size() - ziph::byte_ptr(ef_end));
// Copy extra fields, dropping Zip64 and possibly UnixTime fields.
ExtraField *out_ef = out_ef_begin;
for (const ExtraField *ef = ef_begin; ef < ef_end; ef = ef->next()) {
if ((fix_timestamp && ef->is_unix_time()) || ef->is_zip64()) {
// Skip this one.
} else {
memcpy(out_ef, ef, ef->size());
out_ef = reinterpret_cast<ExtraField *>(
reinterpret_cast<uint8_t *>(out_ef) + ef->size());
}
}
// Set up Zip64 extra field if necessary.
if (out_zip64_size > 0) {
Zip64ExtraField *out_zip64_ef = reinterpret_cast<Zip64ExtraField *>(out_ef);
out_zip64_ef->signature();
out_zip64_ef->attr_count(out_zip64_attr_count);
int copy_count = out_zip64_attr_count < zip64_attr_count
? out_zip64_attr_count
: zip64_attr_count;
if (copy_count > 0) {
out_zip64_ef->attr64(0, zip64_ef->attr64(0));
if (copy_count > 1) {
out_zip64_ef->attr64(1, zip64_ef->attr64(1));
}
}
// Set 64-bit local_header_offset if necessary. It's always the last
// attribute.
if (lh_pos_needs64) {
out_zip64_ef->attr64(out_zip64_attr_count - 1, lh_pos);
}
}
out_cdh->extra_fields(ziph::byte_ptr(out_ef_begin), out_ef_size);
out_cdh->local_header_offset32(lh_pos_needs64 ? 0xFFFFFFFF : lh_pos);
if (fix_timestamp) {
out_cdh->last_mod_file_time(normalized_time);
out_cdh->last_mod_file_date(33);
}
}
uint8_t *OutputJar::ReserveCdr(size_t chunk_size) {
if (cen_size_ + chunk_size > cen_capacity_) {
cen_capacity_ += 1000000;
cen_ = reinterpret_cast<uint8_t *>(realloc(cen_, cen_capacity_));
if (!cen_) {
diag_errx(1, "%s:%d: Cannot allocate %ld bytes for the directory",
__FILE__, __LINE__, cen_capacity_);
}
}
uint8_t *entry = cen_ + cen_size_;
cen_size_ += chunk_size;
return entry;
}
uint8_t *OutputJar::ReserveCdh(size_t size) {
return static_cast<uint8_t *>(memset(ReserveCdr(size), 0, size));
}
// Write out combined jar.
bool OutputJar::Close() {
if (file_ == nullptr) {
return true;
}
for (auto &service_handler : service_handlers_) {
WriteEntry(service_handler->OutputEntry(options_->force_compression));
}
for (auto &extra_combiner : extra_combiners_) {
WriteEntry(extra_combiner->OutputEntry(options_->force_compression));
}
WriteEntry(spring_handlers_.OutputEntry(options_->force_compression));
WriteEntry(spring_schemas_.OutputEntry(options_->force_compression));
WriteEntry(protobuf_meta_handler_.OutputEntry(options_->force_compression));
// TODO(asmundak): handle manifest;
off_t output_position = Position();
bool write_zip64_ecd = output_position >= 0xFFFFFFFF || entries_ >= 0xFFFF ||
cen_size_ >= 0xFFFFFFFF;
size_t cen_size = cen_size_; // Save it before ReserveCdh updates it.
if (write_zip64_ecd) {
ECD64 *ecd64 = reinterpret_cast<ECD64 *>(ReserveCdh(sizeof(ECD64)));
ECD64Locator *ecd64_locator =
reinterpret_cast<ECD64Locator *>(ReserveCdh(sizeof(ECD64Locator)));
ECD *ecd = reinterpret_cast<ECD *>(ReserveCdh(sizeof(ECD)));
ecd64->signature();
ecd64->remaining_size(sizeof(ECD64) - 12);
ecd64->version(0x031E); // Unix, version 3.0
ecd64->version_to_extract(45); // 4.5 (Zip64 support)
ecd64->this_disk_entries(entries_);
ecd64->total_entries(entries_);
ecd64->cen_size(cen_size);
ecd64->cen_offset(output_position);
ecd64_locator->signature();
ecd64_locator->ecd64_offset(output_position + cen_size);
ecd64_locator->total_disks(1);
ecd->signature();
ecd->this_disk_entries16(0xFFFF);
ecd->total_entries16(0xFFFF);
// Java Compiler (javac) uses its own "optimized" Zip handler (see
// https://bugs.openjdk.java.net/browse/JDK-7018859) which may fail
// to handle 0xFFFFFFFF in the CEN size and CEN offset fields. Try
// to use 32-bit values here, too. Hopefully by the time we need to
// handle really large archives, this is fixes upstream. Note that this
// affects javac and javah only, 'jar' experiences no problems.
ecd->cen_size32(std::min(cen_size, static_cast<size_t>(0xFFFFFFFFUL)));
ecd->cen_offset32(
std::min(output_position, static_cast<off_t>(0x0FFFFFFFFL)));
} else {
ECD *ecd = reinterpret_cast<ECD *>(ReserveCdh(sizeof(ECD)));
ecd->signature();
ecd->this_disk_entries16((uint16_t)entries_);
ecd->total_entries16((uint16_t)entries_);
ecd->cen_size32(cen_size);
ecd->cen_offset32(output_position);
}
// Save Central Directory and wrap up.
if (!WriteBytes(cen_, cen_size_)) {
diag_err(1, "%s:%d: Cannot write central directory", __FILE__, __LINE__);
}
free(cen_);
if (fclose(file_)) {
diag_err(1, "%s:%d: %s", __FILE__, __LINE__, path());
}
file_ = nullptr;
// Free the buffer only after fclose(); stdio may flush data from the
// buffer on close.
buffer_.reset();
if (options_->verbose) {
fprintf(stderr, "Wrote %s with %d entries", path(), entries_);
if (duplicate_entries_) {
fprintf(stderr, ", skipped %d entries", duplicate_entries_);
}
fprintf(stderr, "\n");
}
return true;
}
bool IsDir(const std::string &path) {
struct stat st;
if (stat(path.c_str(), &st)) {
diag_warn("%s:%d: stat %s:", __FILE__, __LINE__, path.c_str());
return false;
}
return S_ISDIR(st.st_mode);
}
void OutputJar::ClasspathResource(const std::string &resource_name,
const std::string &resource_path) {
if (known_members_.count(resource_name)) {
if (options_->warn_duplicate_resources) {
diag_warnx(
"%s:%d: Duplicate resource name %s in the --classpath_resource or "
"--resource option",
__FILE__, __LINE__, resource_name.c_str());
// TODO(asmundak): this mimics old behaviour. Confirm that unless
// we run with --warn_duplicate_resources, the output zip file contains
// the concatenated contents of the all the resources with the same name.
return;
}
}
MappedFile mapped_file;
if (mapped_file.Open(resource_path)) {
Concatenator *classpath_resource = new Concatenator(resource_name);
classpath_resource->Append(
reinterpret_cast<const char *>(mapped_file.start()),
mapped_file.size());
classpath_resources_.emplace_back(classpath_resource);
known_members_.emplace(resource_name, EntryInfo{classpath_resource});
} else if (IsDir(resource_path)) {
// add an empty entry for the directory so its path ends up in the
// manifest
classpath_resources_.emplace_back(new Concatenator(resource_name + "/"));
known_members_.emplace(resource_name, EntryInfo{&null_combiner_});
} else {
diag_err(1, "%s:%d: %s", __FILE__, __LINE__, resource_path.c_str());
}
}
ssize_t OutputJar::AppendFile(int in_fd, off_t offset, size_t count) {
if (count == 0) {
return 0;
}
std::unique_ptr<void, decltype(free)*> buffer(malloc(kBufferSize), free);
if (buffer == nullptr) {
diag_err(1, "%s:%d: malloc", __FILE__, __LINE__);
}
ssize_t total_written = 0;
while (total_written < count) {
size_t len = std::min(kBufferSize, count - total_written);
ssize_t n_read = pread(in_fd, buffer.get(), len, offset + total_written);
if (n_read > 0) {
if (!WriteBytes(buffer.get(), n_read)) {
return -1;
}
total_written += n_read;
} else if (n_read == 0) {
break;
} else {
return -1;
}
}
return total_written;
}
void OutputJar::ExtraCombiner(const std::string &entry_name,
Combiner *combiner) {
extra_combiners_.emplace_back(combiner);
known_members_.emplace(entry_name, EntryInfo{combiner});
}
bool OutputJar::WriteBytes(const void *buffer, size_t count) {
size_t written = fwrite(buffer, 1, count, file_);
outpos_ += written;
return written == count;
}
void OutputJar::ExtraHandler(const CDH *) {}