1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <errno.h>
18#include <stdio.h>
19#include <stdlib.h>
20
21#include <algorithm>
22#include <memory>
23#include <string>
24#include <vector>
25
26#include <ziparchive/zip_archive.h>
27#include <ziparchive/zip_archive_stream_entry.h>
28#include <ziparchive/zip_writer.h>
29
30static void usage() {
31  fprintf(stderr, "usage: bionic_tests_zipalign ALIGNMENT INPUT_ZIP_FILE OUTPUT_ZIP_FILE\n");
32  fprintf(stderr, "  ALIGNMENT:\n");
33  fprintf(stderr, "    The new alignment of all entries in the new zip file.\n");
34  fprintf(stderr, "  INPUT_ZIP_FILE:\n");
35  fprintf(stderr, "    The input zip file that will be read but left unmodified.\n");
36  fprintf(stderr, "  OUTPUT_ZIP_FILE:\n");
37  fprintf(stderr, "    The output zip file that will be created from the input file.\n");
38}
39
40using ZipData = std::pair<std::unique_ptr<ZipEntry>, std::unique_ptr<ZipString>>;
41
42static bool GetEntries(ZipArchiveHandle handle, std::vector<ZipData>* entries) {
43  void* cookie;
44  int32_t return_value = StartIteration(handle, &cookie, nullptr, nullptr);
45  if (return_value != 0) {
46    fprintf(stderr, "Unable to iterate over entries: %s\n", ErrorCodeString(return_value));
47    return false;
48  }
49
50  ZipEntry entry;
51  ZipString name;
52  while ((return_value = Next(cookie, &entry, &name)) == 0) {
53    entries->emplace_back(std::make_pair(std::make_unique<ZipEntry>(entry),
54                                         std::make_unique<ZipString>(name)));
55  }
56  if (return_value != -1) {
57    fprintf(stderr, "Error while iterating over zip entries: %s\n", ErrorCodeString(return_value));
58  } else {
59    // Sort by offset.
60    std::sort(entries->begin(), entries->end(),
61              [](ZipData& a, ZipData& b) { return a.first->offset < b.first->offset; });
62  }
63
64  EndIteration(cookie);
65  return return_value == -1;
66}
67
68static bool CreateAlignedZip(ZipArchiveHandle& handle, FILE* zip_dst, uint32_t alignment) {
69  std::vector<ZipData> entries;
70  // We will not free the memory created in entries since the program
71  // terminates right after this function is called.
72  if (!GetEntries(handle, &entries)) {
73    return false;
74  }
75
76  ZipWriter writer(zip_dst);
77
78  int32_t error;
79  for (auto& entry : entries) {
80    ZipEntry* zip_entry = entry.first.get();
81    ZipString* zip_str = entry.second.get();
82
83    size_t flags = 0;
84    if ((zip_entry->method & kCompressDeflated) != 0) {
85      flags |= ZipWriter::kCompress;
86    }
87    std::string zip_name(reinterpret_cast<const char*>(zip_str->name), zip_str->name_length);
88    error = writer.StartAlignedEntry(zip_name.c_str(), flags, alignment);
89    if (error != 0) {
90      fprintf(stderr, "StartAlignedEntry failed: %s\n", ZipWriter::ErrorCodeString(error));
91      return false;
92    }
93    std::unique_ptr<ZipArchiveStreamEntry> stream(
94        ZipArchiveStreamEntry::Create(handle, *zip_entry));
95    const std::vector<uint8_t>* data;
96    while ((data = stream->Read()) != nullptr) {
97      error = writer.WriteBytes(data->data(), data->size());
98      if (error != 0) {
99        fprintf(stderr, "WriteBytes failed: %s\n", ZipWriter::ErrorCodeString(error));
100        return false;
101      }
102    }
103    if (!stream->Verify()) {
104      fprintf(stderr, "Failed to verify zip stream writer entry.\n");
105      return false;
106    }
107    error = writer.FinishEntry();
108    if (error != 0) {
109      fprintf(stderr, "FinishEntry failed: %s\n", ZipWriter::ErrorCodeString(error));
110    }
111  }
112
113  error = writer.Finish();
114  if (error != 0) {
115    fprintf(stderr, "Finish failed: %s\n", ZipWriter::ErrorCodeString(error));
116    return false;
117  }
118  return true;
119}
120
121int main(int argc, char* argv[]) {
122  if (argc != 4) {
123    usage();
124    return 1;
125  }
126
127  char* end;
128  unsigned long int alignment = strtoul(argv[1], &end, 10);
129  if ((alignment == ULONG_MAX && errno == ERANGE) || *end != '\0') {
130    fprintf(stderr, "ALIGNMENT value is not a valid number: %s\n", argv[1]);
131    usage();
132    return 1;
133  }
134  if (((alignment - 1) & alignment) != 0) {
135    fprintf(stderr, "ALIGNMENT value is not a power of 2: %s\n", argv[1]);
136    return 1;
137  }
138
139  ZipArchiveHandle handle;
140
141  int32_t return_value = OpenArchive(argv[2], &handle);
142  if (return_value != 0) {
143    CloseArchive(handle);
144    fprintf(stderr, "Unable to open '%s': %s\n", argv[2], ErrorCodeString(return_value));
145    return 1;
146  }
147
148  FILE* zip_dst = fopen(argv[3], "we");
149  if (zip_dst == nullptr) {
150    fprintf(stderr, "Unable to create '%s': %s\n", argv[3], strerror(errno));
151    return 1;
152  }
153
154  bool success = CreateAlignedZip(handle, zip_dst, static_cast<uint32_t>(alignment));
155
156  CloseArchive(handle);
157  fclose(zip_dst);
158
159  return success ? 0 : 1;
160}
161