libziparchive/unzip.cpp - android_system_core - Gitiles

 /*
  * Copyright (C) 2017 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 <errno.h>
 #include <fcntl.h>
 #include <fnmatch.h>
 #include <getopt.h>
 #include <inttypes.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>

 #include <set>
 #include <string>

 #include <android-base/file.h>
 #include <android-base/strings.h>
 #include <ziparchive/zip_archive.h>

 using android::base::EndsWith;
 using android::base::StartsWith;

 enum OverwriteMode {
   kAlways,
   kNever,
   kPrompt,
 };

 enum Role {
   kUnzip,
   kZipinfo,
 };

 static Role role;
 static OverwriteMode overwrite_mode = kPrompt;
 static bool flag_1 = false;
 static const char* flag_d = nullptr;
 static bool flag_l = false;
 static bool flag_p = false;
 static bool flag_q = false;
 static bool flag_v = false;
 static bool flag_x = false;
 static const char* archive_name = nullptr;
 static std::set<std::string> includes;
 static std::set<std::string> excludes;
 static uint64_t total_uncompressed_length = 0;
 static uint64_t total_compressed_length = 0;
 static size_t file_count = 0;

 static const char* g_progname;

 static void die(int error, const char* fmt, ...) {
   va_list ap;

   va_start(ap, fmt);
   fprintf(stderr, "%s: ", g_progname);
   vfprintf(stderr, fmt, ap);
   if (error != 0) fprintf(stderr, ": %s", strerror(error));
   fprintf(stderr, "\n");
   va_end(ap);
   exit(1);
 }

 static bool ShouldInclude(const std::string& name) {
   // Explicitly excluded?
   if (!excludes.empty()) {
     for (const auto& exclude : excludes) {
       if (!fnmatch(exclude.c_str(), name.c_str(), 0)) return false;
     }
   }

   // Implicitly included?
   if (includes.empty()) return true;

   // Explicitly included?
   for (const auto& include : includes) {
     if (!fnmatch(include.c_str(), name.c_str(), 0)) return true;
   }
   return false;
 }

 static bool MakeDirectoryHierarchy(const std::string& path) {
   // stat rather than lstat because a symbolic link to a directory is fine too.
   struct stat sb;
   if (stat(path.c_str(), &sb) != -1 && S_ISDIR(sb.st_mode)) return true;

   // Ensure the parent directories exist first.
   if (!MakeDirectoryHierarchy(android::base::Dirname(path))) return false;

   // Then try to create this directory.
   return (mkdir(path.c_str(), 0777) != -1);
 }

 static int CompressionRatio(int64_t uncompressed, int64_t compressed) {
   if (uncompressed == 0) return 0;
   return static_cast<int>((100LL * (uncompressed - compressed)) / uncompressed);
 }

 static void MaybeShowHeader(ZipArchiveHandle zah) {
   if (role == kUnzip) {
     // unzip has three formats.
     if (!flag_q) printf("Archive:  %s\n", archive_name);
     if (flag_v) {
       printf(
           " Length   Method    Size  Cmpr    Date    Time   CRC-32   Name\n"
           "--------  ------  ------- ---- ---------- ----- --------  ----\n");
     } else if (flag_l) {
       printf(
           "  Length      Date    Time    Name\n"
           "---------  ---------- -----   ----\n");
     }
   } else {
     // zipinfo.
     if (!flag_1 && includes.empty() && excludes.empty()) {
       ZipArchiveInfo info{GetArchiveInfo(zah)};
       printf("Archive:  %s\n", archive_name);
       printf("Zip file size: %" PRId64 " bytes, number of entries: %zu\n", info.archive_size,
              info.entry_count);
     }
   }
 }

 static void MaybeShowFooter() {
   if (role == kUnzip) {
     if (flag_v) {
       printf(
           "--------          -------  ---                            -------\n"
           "%8" PRId64 "         %8" PRId64 " %3d%%                            %zu file%s\n",
           total_uncompressed_length, total_compressed_length,
           CompressionRatio(total_uncompressed_length, total_compressed_length), file_count,
           (file_count == 1) ? "" : "s");
     } else if (flag_l) {
       printf(
           "---------                     -------\n"
           "%9" PRId64 "                     %zu file%s\n",
           total_uncompressed_length, file_count, (file_count == 1) ? "" : "s");
     }
   } else {
     if (!flag_1 && includes.empty() && excludes.empty()) {
       printf("%zu files, %" PRId64 " bytes uncompressed, %" PRId64 " bytes compressed: %3d%%\n",
              file_count, total_uncompressed_length, total_compressed_length,
              CompressionRatio(total_uncompressed_length, total_compressed_length));
     }
   }
 }

 static bool PromptOverwrite(const std::string& dst) {
   // TODO: [r]ename not implemented because it doesn't seem useful.
   printf("replace %s? [y]es, [n]o, [A]ll, [N]one: ", dst.c_str());
   fflush(stdout);
   while (true) {
     char* line = nullptr;
     size_t n;
     if (getline(&line, &n, stdin) == -1) {
       die(0, "(EOF/read error; assuming [N]one...)");
       overwrite_mode = kNever;
       return false;
     }
     if (n == 0) continue;
     char cmd = line[0];
     free(line);
     switch (cmd) {
       case 'y':
         return true;
       case 'n':
         return false;
       case 'A':
         overwrite_mode = kAlways;
         return true;
       case 'N':
         overwrite_mode = kNever;
         return false;
     }
   }
 }

 static void ExtractToPipe(ZipArchiveHandle zah, ZipEntry& entry, const std::string& name) {
   // We need to extract to memory because ExtractEntryToFile insists on
   // being able to seek and truncate, and you can't do that with stdout.
   uint8_t* buffer = new uint8_t[entry.uncompressed_length];
   int err = ExtractToMemory(zah, &entry, buffer, entry.uncompressed_length);
   if (err < 0) {
     die(0, "failed to extract %s: %s", name.c_str(), ErrorCodeString(err));
   }
   if (!android::base::WriteFully(1, buffer, entry.uncompressed_length)) {
     die(errno, "failed to write %s to stdout", name.c_str());
   }
   delete[] buffer;
 }

 static void ExtractOne(ZipArchiveHandle zah, ZipEntry& entry, const std::string& name) {
   // Bad filename?
   if (StartsWith(name, "/") || StartsWith(name, "../") || name.find("/../") != std::string::npos) {
     die(0, "bad filename %s", name.c_str());
   }

   // Where are we actually extracting to (for human-readable output)?
   std::string dst;
   if (flag_d) {
     dst = flag_d;
     if (!EndsWith(dst, "/")) dst += '/';
   }
   dst += name;

   // Ensure the directory hierarchy exists.
   if (!MakeDirectoryHierarchy(android::base::Dirname(name))) {
     die(errno, "couldn't create directory hierarchy for %s", dst.c_str());
   }

   // An entry in a zip file can just be a directory itself.
   if (EndsWith(name, "/")) {
     if (mkdir(name.c_str(), entry.unix_mode) == -1) {
       // If the directory already exists, that's fine.
       if (errno == EEXIST) {
         struct stat sb;
         if (stat(name.c_str(), &sb) != -1 && S_ISDIR(sb.st_mode)) return;
       }
       die(errno, "couldn't extract directory %s", dst.c_str());
     }
     return;
   }

   // Create the file.
   int fd = open(name.c_str(), O_CREAT | O_WRONLY | O_CLOEXEC | O_EXCL, entry.unix_mode);
   if (fd == -1 && errno == EEXIST) {
     if (overwrite_mode == kNever) return;
     if (overwrite_mode == kPrompt && !PromptOverwrite(dst)) return;
     // Either overwrite_mode is kAlways or the user consented to this specific case.
     fd = open(name.c_str(), O_WRONLY | O_CREAT | O_CLOEXEC | O_TRUNC, entry.unix_mode);
   }
   if (fd == -1) die(errno, "couldn't create file %s", dst.c_str());

   // Actually extract into the file.
   if (!flag_q) printf("  inflating: %s\n", dst.c_str());
   int err = ExtractEntryToFile(zah, &entry, fd);
   if (err < 0) die(0, "failed to extract %s: %s", dst.c_str(), ErrorCodeString(err));
   close(fd);
 }

 static void ListOne(const ZipEntry& entry, const std::string& name) {
   tm t = entry.GetModificationTime();
   char time[32];
   snprintf(time, sizeof(time), "%04d-%02d-%02d %02d:%02d", t.tm_year + 1900, t.tm_mon + 1,
            t.tm_mday, t.tm_hour, t.tm_min);
   if (flag_v) {
     printf("%8d  %s  %7d %3d%% %s %08x  %s\n", entry.uncompressed_length,
            (entry.method == kCompressStored) ? "Stored" : "Defl:N", entry.compressed_length,
            CompressionRatio(entry.uncompressed_length, entry.compressed_length), time, entry.crc32,
            name.c_str());
   } else {
     printf("%9d  %s   %s\n", entry.uncompressed_length, time, name.c_str());
   }
 }

 static void InfoOne(const ZipEntry& entry, const std::string& name) {
   if (flag_1) {
     // "android-ndk-r19b/sources/android/NOTICE"
     printf("%s\n", name.c_str());
     return;
   }

   int version = entry.version_made_by & 0xff;
   int os = (entry.version_made_by >> 8) & 0xff;

   // TODO: Support suid/sgid? Non-Unix/non-FAT host file system attributes?
   const char* src_fs = "???";
   char mode[] = "???       ";
   if (os == 0) {
     src_fs = "fat";
     // https://docs.microsoft.com/en-us/windows/win32/fileio/file-attribute-constants
     int attrs = entry.external_file_attributes & 0xff;
     mode[0] = (attrs & 0x10) ? 'd' : '-';
     mode[1] = 'r';
     mode[2] = (attrs & 0x01) ? '-' : 'w';
     // The man page also mentions ".btm", but that seems to be obsolete?
     mode[3] = EndsWith(name, ".exe") || EndsWith(name, ".com") || EndsWith(name, ".bat") ||
                       EndsWith(name, ".cmd")
                   ? 'x'
                   : '-';
     mode[4] = (attrs & 0x20) ? 'a' : '-';
     mode[5] = (attrs & 0x02) ? 'h' : '-';
     mode[6] = (attrs & 0x04) ? 's' : '-';
   } else if (os == 3) {
     src_fs = "unx";
     mode[0] = S_ISDIR(entry.unix_mode) ? 'd' : (S_ISREG(entry.unix_mode) ? '-' : '?');
     mode[1] = entry.unix_mode & S_IRUSR ? 'r' : '-';
     mode[2] = entry.unix_mode & S_IWUSR ? 'w' : '-';
     mode[3] = entry.unix_mode & S_IXUSR ? 'x' : '-';
     mode[4] = entry.unix_mode & S_IRGRP ? 'r' : '-';
     mode[5] = entry.unix_mode & S_IWGRP ? 'w' : '-';
     mode[6] = entry.unix_mode & S_IXGRP ? 'x' : '-';
     mode[7] = entry.unix_mode & S_IROTH ? 'r' : '-';
     mode[8] = entry.unix_mode & S_IWOTH ? 'w' : '-';
     mode[9] = entry.unix_mode & S_IXOTH ? 'x' : '-';
   }

   char method[5] = "stor";
   if (entry.method == kCompressDeflated) {
     snprintf(method, sizeof(method), "def%c", "NXFS"[(entry.gpbf >> 1) & 0x3]);
   }

   // TODO: zipinfo (unlike unzip) sometimes uses time zone?
   // TODO: this uses 4-digit years because we're not barbarians unless interoperability forces it.
   tm t = entry.GetModificationTime();
   char time[32];
   snprintf(time, sizeof(time), "%04d-%02d-%02d %02d:%02d", t.tm_year + 1900, t.tm_mon + 1,
            t.tm_mday, t.tm_hour, t.tm_min);

   // "-rw-r--r--  3.0 unx      577 t- defX 19-Feb-12 16:09 android-ndk-r19b/sources/android/NOTICE"
   printf("%s %2d.%d %s %8d %c%c %s %s %s\n", mode, version / 10, version % 10, src_fs,
          entry.uncompressed_length, entry.is_text ? 't' : 'b',
          entry.has_data_descriptor ? 'X' : 'x', method, time, name.c_str());
 }

 static void ProcessOne(ZipArchiveHandle zah, ZipEntry& entry, const std::string& name) {
   if (role == kUnzip) {
     if (flag_l || flag_v) {
       // -l or -lv or -lq or -v.
       ListOne(entry, name);
     } else {
       // Actually extract.
       if (flag_p) {
         ExtractToPipe(zah, entry, name);
       } else {
         ExtractOne(zah, entry, name);
       }
     }
   } else {
     // zipinfo or zipinfo -1.
     InfoOne(entry, name);
   }
   total_uncompressed_length += entry.uncompressed_length;
   total_compressed_length += entry.compressed_length;
   ++file_count;
 }

 static void ProcessAll(ZipArchiveHandle zah) {
   MaybeShowHeader(zah);

   // libziparchive iteration order doesn't match the central directory.
   // We could sort, but that would cost extra and wouldn't match either.
   void* cookie;
   int err = StartIteration(zah, &cookie);
   if (err != 0) {
     die(0, "couldn't iterate %s: %s", archive_name, ErrorCodeString(err));
   }

   ZipEntry entry;
   std::string name;
   while ((err = Next(cookie, &entry, &name)) >= 0) {
     if (ShouldInclude(name)) ProcessOne(zah, entry, name);
   }

   if (err < -1) die(0, "failed iterating %s: %s", archive_name, ErrorCodeString(err));
   EndIteration(cookie);

   MaybeShowFooter();
 }

 static void ShowHelp(bool full) {
   if (role == kUnzip) {
     fprintf(full ? stdout : stderr, "usage: unzip [-d DIR] [-lnopqv] ZIP [FILE...] [-x FILE...]\n");
     if (!full) exit(EXIT_FAILURE);

     printf(
         "\n"
         "Extract FILEs from ZIP archive. Default is all files. Both the include and\n"
         "exclude (-x) lists use shell glob patterns.\n"
         "\n"
         "-d DIR	Extract into DIR\n"
         "-l	List contents (-lq excludes archive name, -lv is verbose)\n"
         "-n	Never overwrite files (default: prompt)\n"
         "-o	Always overwrite files\n"
         "-p	Pipe to stdout\n"
         "-q	Quiet\n"
         "-v	List contents verbosely\n"
         "-x FILE	Exclude files\n");
   } else {
     fprintf(full ? stdout : stderr, "usage: zipinfo [-1] ZIP [FILE...] [-x FILE...]\n");
     if (!full) exit(EXIT_FAILURE);

     printf(
         "\n"
         "Show information about FILEs from ZIP archive. Default is all files.\n"
         "Both the include and exclude (-x) lists use shell glob patterns.\n"
         "\n"
         "-1	Show filenames only, one per line\n"
         "-x FILE	Exclude files\n");
   }
   exit(EXIT_SUCCESS);
 }

 static void HandleCommonOption(int opt) {
   switch (opt) {
     case 'h':
       ShowHelp(true);
       break;
     case 'x':
       flag_x = true;
       break;
     case 1:
       // -x swallows all following arguments, so we use '-' in the getopt
       // string and collect files here.
       if (!archive_name) {
         archive_name = optarg;
       } else if (flag_x) {
         excludes.insert(optarg);
       } else {
         includes.insert(optarg);
       }
       break;
     default:
       ShowHelp(false);
       break;
   }
 }

 int main(int argc, char* argv[]) {
   // Who am I, and what am I doing?
   g_progname = basename(argv[0]);
   if (!strcmp(g_progname, "ziptool") && argc > 1) return main(argc - 1, argv + 1);
   if (!strcmp(g_progname, "unzip")) {
     role = kUnzip;
   } else if (!strcmp(g_progname, "zipinfo")) {
     role = kZipinfo;
   } else {
     die(0, "run as ziptool with unzip or zipinfo as the first argument, or symlink");
   }

   static const struct option opts[] = {
       {"help", no_argument, 0, 'h'},
   };

   if (role == kUnzip) {
     // `unzip -Z` is "zipinfo mode", so in that case just restart...
     if (argc > 1 && !strcmp(argv[1], "-Z")) {
       argv[1] = const_cast<char*>("zipinfo");
       return main(argc - 1, argv + 1);
     }

     int opt;
     while ((opt = getopt_long(argc, argv, "-d:hlnopqvx", opts, nullptr)) != -1) {
       switch (opt) {
         case 'd':
           flag_d = optarg;
           break;
         case 'l':
           flag_l = true;
           break;
         case 'n':
           overwrite_mode = kNever;
           break;
         case 'o':
           overwrite_mode = kAlways;
           break;
         case 'p':
           flag_p = flag_q = true;
           break;
         case 'q':
           flag_q = true;
           break;
         case 'v':
           flag_v = true;
           break;
         default:
           HandleCommonOption(opt);
           break;
       }
     }
   } else {
     int opt;
     while ((opt = getopt_long(argc, argv, "-1hx", opts, nullptr)) != -1) {
       switch (opt) {
         case '1':
           flag_1 = true;
           break;
         default:
           HandleCommonOption(opt);
           break;
       }
     }
   }

   if (!archive_name) die(0, "missing archive filename");

   // We can't support "-" to unzip from stdin because libziparchive relies on mmap.
   ZipArchiveHandle zah;
   int32_t err;
   if ((err = OpenArchive(archive_name, &zah)) != 0) {
     die(0, "couldn't open %s: %s", archive_name, ErrorCodeString(err));
   }

   // Implement -d by changing into that directory.
   // We'll create implicit directories based on paths in the zip file, but we
   // require that the -d directory already exists.
   if (flag_d && chdir(flag_d) == -1) die(errno, "couldn't chdir to %s", flag_d);

   ProcessAll(zah);

   CloseArchive(zah);
   return 0;
 }
	/*
	* Copyright (C) 2017 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 <errno.h>
	#include <fcntl.h>
	#include <fnmatch.h>
	#include <getopt.h>
	#include <inttypes.h>
	#include <stdarg.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <time.h>
	#include <unistd.h>

	#include <set>
	#include <string>

	#include <android-base/file.h>
	#include <android-base/strings.h>
	#include <ziparchive/zip_archive.h>

	using android::base::EndsWith;
	using android::base::StartsWith;

	enum OverwriteMode {
	kAlways,
	kNever,
	kPrompt,
	};

	enum Role {
	kUnzip,
	kZipinfo,
	};

	static Role role;
	static OverwriteMode overwrite_mode = kPrompt;
	static bool flag_1 = false;
	static const char* flag_d = nullptr;
	static bool flag_l = false;
	static bool flag_p = false;
	static bool flag_q = false;
	static bool flag_v = false;
	static bool flag_x = false;
	static const char* archive_name = nullptr;
	static std::set<std::string> includes;
	static std::set<std::string> excludes;
	static uint64_t total_uncompressed_length = 0;
	static uint64_t total_compressed_length = 0;
	static size_t file_count = 0;

	static const char* g_progname;

	static void die(int error, const char* fmt, ...) {
	va_list ap;

	va_start(ap, fmt);
	fprintf(stderr, "%s: ", g_progname);
	vfprintf(stderr, fmt, ap);
	if (error != 0) fprintf(stderr, ": %s", strerror(error));
	fprintf(stderr, "\n");
	va_end(ap);
	exit(1);
	}

	static bool ShouldInclude(const std::string& name) {
	// Explicitly excluded?
	if (!excludes.empty()) {
	for (const auto& exclude : excludes) {
	if (!fnmatch(exclude.c_str(), name.c_str(), 0)) return false;
	}
	}

	// Implicitly included?
	if (includes.empty()) return true;

	// Explicitly included?
	for (const auto& include : includes) {
	if (!fnmatch(include.c_str(), name.c_str(), 0)) return true;
	}
	return false;
	}

	static bool MakeDirectoryHierarchy(const std::string& path) {
	// stat rather than lstat because a symbolic link to a directory is fine too.
	struct stat sb;
	if (stat(path.c_str(), &sb) != -1 && S_ISDIR(sb.st_mode)) return true;

	// Ensure the parent directories exist first.
	if (!MakeDirectoryHierarchy(android::base::Dirname(path))) return false;

	// Then try to create this directory.
	return (mkdir(path.c_str(), 0777) != -1);
	}

	static int CompressionRatio(int64_t uncompressed, int64_t compressed) {
	if (uncompressed == 0) return 0;
	return static_cast<int>((100LL * (uncompressed - compressed)) / uncompressed);
	}

	static void MaybeShowHeader(ZipArchiveHandle zah) {
	if (role == kUnzip) {
	// unzip has three formats.
	if (!flag_q) printf("Archive: %s\n", archive_name);
	if (flag_v) {
	printf(
	" Length Method Size Cmpr Date Time CRC-32 Name\n"
	"-------- ------ ------- ---- ---------- ----- -------- ----\n");
	} else if (flag_l) {
	printf(
	" Length Date Time Name\n"
	"--------- ---------- ----- ----\n");
	}
	} else {
	// zipinfo.
	if (!flag_1 && includes.empty() && excludes.empty()) {
	ZipArchiveInfo info{GetArchiveInfo(zah)};
	printf("Archive: %s\n", archive_name);
	printf("Zip file size: %" PRId64 " bytes, number of entries: %zu\n", info.archive_size,
	info.entry_count);
	}
	}
	}

	static void MaybeShowFooter() {
	if (role == kUnzip) {
	if (flag_v) {
	printf(
	"-------- ------- --- -------\n"
	"%8" PRId64 " %8" PRId64 " %3d%% %zu file%s\n",
	total_uncompressed_length, total_compressed_length,
	CompressionRatio(total_uncompressed_length, total_compressed_length), file_count,
	(file_count == 1) ? "" : "s");
	} else if (flag_l) {
	printf(
	"--------- -------\n"
	"%9" PRId64 " %zu file%s\n",
	total_uncompressed_length, file_count, (file_count == 1) ? "" : "s");
	}
	} else {
	if (!flag_1 && includes.empty() && excludes.empty()) {
	printf("%zu files, %" PRId64 " bytes uncompressed, %" PRId64 " bytes compressed: %3d%%\n",
	file_count, total_uncompressed_length, total_compressed_length,
	CompressionRatio(total_uncompressed_length, total_compressed_length));
	}
	}
	}

	static bool PromptOverwrite(const std::string& dst) {
	// TODO: [r]ename not implemented because it doesn't seem useful.
	printf("replace %s? [y]es, [n]o, [A]ll, [N]one: ", dst.c_str());
	fflush(stdout);
	while (true) {
	char* line = nullptr;
	size_t n;
	if (getline(&line, &n, stdin) == -1) {
	die(0, "(EOF/read error; assuming [N]one...)");
	overwrite_mode = kNever;
	return false;
	}
	if (n == 0) continue;
	char cmd = line[0];
	free(line);
	switch (cmd) {
	case 'y':
	return true;
	case 'n':
	return false;
	case 'A':
	overwrite_mode = kAlways;
	return true;
	case 'N':
	overwrite_mode = kNever;
	return false;
	}
	}
	}

	static void ExtractToPipe(ZipArchiveHandle zah, ZipEntry& entry, const std::string& name) {
	// We need to extract to memory because ExtractEntryToFile insists on
	// being able to seek and truncate, and you can't do that with stdout.
	uint8_t* buffer = new uint8_t[entry.uncompressed_length];
	int err = ExtractToMemory(zah, &entry, buffer, entry.uncompressed_length);
	if (err < 0) {
	die(0, "failed to extract %s: %s", name.c_str(), ErrorCodeString(err));
	}
	if (!android::base::WriteFully(1, buffer, entry.uncompressed_length)) {
	die(errno, "failed to write %s to stdout", name.c_str());
	}
	delete[] buffer;
	}

	static void ExtractOne(ZipArchiveHandle zah, ZipEntry& entry, const std::string& name) {
	// Bad filename?
	if (StartsWith(name, "/") \|\| StartsWith(name, "../") \|\| name.find("/../") != std::string::npos) {
	die(0, "bad filename %s", name.c_str());
	}

	// Where are we actually extracting to (for human-readable output)?
	std::string dst;
	if (flag_d) {
	dst = flag_d;
	if (!EndsWith(dst, "/")) dst += '/';
	}
	dst += name;

	// Ensure the directory hierarchy exists.
	if (!MakeDirectoryHierarchy(android::base::Dirname(name))) {
	die(errno, "couldn't create directory hierarchy for %s", dst.c_str());
	}

	// An entry in a zip file can just be a directory itself.
	if (EndsWith(name, "/")) {
	if (mkdir(name.c_str(), entry.unix_mode) == -1) {
	// If the directory already exists, that's fine.
	if (errno == EEXIST) {
	struct stat sb;
	if (stat(name.c_str(), &sb) != -1 && S_ISDIR(sb.st_mode)) return;
	}
	die(errno, "couldn't extract directory %s", dst.c_str());
	}
	return;
	}

	// Create the file.
	int fd = open(name.c_str(), O_CREAT \| O_WRONLY \| O_CLOEXEC \| O_EXCL, entry.unix_mode);
	if (fd == -1 && errno == EEXIST) {
	if (overwrite_mode == kNever) return;
	if (overwrite_mode == kPrompt && !PromptOverwrite(dst)) return;
	// Either overwrite_mode is kAlways or the user consented to this specific case.
	fd = open(name.c_str(), O_WRONLY \| O_CREAT \| O_CLOEXEC \| O_TRUNC, entry.unix_mode);
	}
	if (fd == -1) die(errno, "couldn't create file %s", dst.c_str());

	// Actually extract into the file.
	if (!flag_q) printf(" inflating: %s\n", dst.c_str());
	int err = ExtractEntryToFile(zah, &entry, fd);
	if (err < 0) die(0, "failed to extract %s: %s", dst.c_str(), ErrorCodeString(err));
	close(fd);
	}

	static void ListOne(const ZipEntry& entry, const std::string& name) {
	tm t = entry.GetModificationTime();
	char time[32];
	snprintf(time, sizeof(time), "%04d-%02d-%02d %02d:%02d", t.tm_year + 1900, t.tm_mon + 1,
	t.tm_mday, t.tm_hour, t.tm_min);
	if (flag_v) {
	printf("%8d %s %7d %3d%% %s %08x %s\n", entry.uncompressed_length,
	(entry.method == kCompressStored) ? "Stored" : "Defl:N", entry.compressed_length,
	CompressionRatio(entry.uncompressed_length, entry.compressed_length), time, entry.crc32,
	name.c_str());
	} else {
	printf("%9d %s %s\n", entry.uncompressed_length, time, name.c_str());
	}
	}

	static void InfoOne(const ZipEntry& entry, const std::string& name) {
	if (flag_1) {
	// "android-ndk-r19b/sources/android/NOTICE"
	printf("%s\n", name.c_str());
	return;
	}

	int version = entry.version_made_by & 0xff;
	int os = (entry.version_made_by >> 8) & 0xff;

	// TODO: Support suid/sgid? Non-Unix/non-FAT host file system attributes?
	const char* src_fs = "???";
	char mode[] = "??? ";
	if (os == 0) {
	src_fs = "fat";
	// https://docs.microsoft.com/en-us/windows/win32/fileio/file-attribute-constants
	int attrs = entry.external_file_attributes & 0xff;
	mode[0] = (attrs & 0x10) ? 'd' : '-';
	mode[1] = 'r';
	mode[2] = (attrs & 0x01) ? '-' : 'w';
	// The man page also mentions ".btm", but that seems to be obsolete?
	mode[3] = EndsWith(name, ".exe") \|\| EndsWith(name, ".com") \|\| EndsWith(name, ".bat") \|\|
	EndsWith(name, ".cmd")
	? 'x'
	: '-';
	mode[4] = (attrs & 0x20) ? 'a' : '-';
	mode[5] = (attrs & 0x02) ? 'h' : '-';
	mode[6] = (attrs & 0x04) ? 's' : '-';
	} else if (os == 3) {
	src_fs = "unx";
	mode[0] = S_ISDIR(entry.unix_mode) ? 'd' : (S_ISREG(entry.unix_mode) ? '-' : '?');
	mode[1] = entry.unix_mode & S_IRUSR ? 'r' : '-';
	mode[2] = entry.unix_mode & S_IWUSR ? 'w' : '-';
	mode[3] = entry.unix_mode & S_IXUSR ? 'x' : '-';
	mode[4] = entry.unix_mode & S_IRGRP ? 'r' : '-';
	mode[5] = entry.unix_mode & S_IWGRP ? 'w' : '-';
	mode[6] = entry.unix_mode & S_IXGRP ? 'x' : '-';
	mode[7] = entry.unix_mode & S_IROTH ? 'r' : '-';
	mode[8] = entry.unix_mode & S_IWOTH ? 'w' : '-';
	mode[9] = entry.unix_mode & S_IXOTH ? 'x' : '-';
	}

	char method[5] = "stor";
	if (entry.method == kCompressDeflated) {
	snprintf(method, sizeof(method), "def%c", "NXFS"[(entry.gpbf >> 1) & 0x3]);
	}

	// TODO: zipinfo (unlike unzip) sometimes uses time zone?
	// TODO: this uses 4-digit years because we're not barbarians unless interoperability forces it.
	tm t = entry.GetModificationTime();
	char time[32];
	snprintf(time, sizeof(time), "%04d-%02d-%02d %02d:%02d", t.tm_year + 1900, t.tm_mon + 1,
	t.tm_mday, t.tm_hour, t.tm_min);

	// "-rw-r--r-- 3.0 unx 577 t- defX 19-Feb-12 16:09 android-ndk-r19b/sources/android/NOTICE"
	printf("%s %2d.%d %s %8d %c%c %s %s %s\n", mode, version / 10, version % 10, src_fs,
	entry.uncompressed_length, entry.is_text ? 't' : 'b',
	entry.has_data_descriptor ? 'X' : 'x', method, time, name.c_str());
	}

	static void ProcessOne(ZipArchiveHandle zah, ZipEntry& entry, const std::string& name) {
	if (role == kUnzip) {
	if (flag_l \|\| flag_v) {
	// -l or -lv or -lq or -v.
	ListOne(entry, name);
	} else {
	// Actually extract.
	if (flag_p) {
	ExtractToPipe(zah, entry, name);
	} else {
	ExtractOne(zah, entry, name);
	}
	}
	} else {
	// zipinfo or zipinfo -1.
	InfoOne(entry, name);
	}
	total_uncompressed_length += entry.uncompressed_length;
	total_compressed_length += entry.compressed_length;
	++file_count;
	}

	static void ProcessAll(ZipArchiveHandle zah) {
	MaybeShowHeader(zah);

	// libziparchive iteration order doesn't match the central directory.
	// We could sort, but that would cost extra and wouldn't match either.
	void* cookie;
	int err = StartIteration(zah, &cookie);
	if (err != 0) {
	die(0, "couldn't iterate %s: %s", archive_name, ErrorCodeString(err));
	}

	ZipEntry entry;
	std::string name;
	while ((err = Next(cookie, &entry, &name)) >= 0) {
	if (ShouldInclude(name)) ProcessOne(zah, entry, name);
	}

	if (err < -1) die(0, "failed iterating %s: %s", archive_name, ErrorCodeString(err));
	EndIteration(cookie);

	MaybeShowFooter();
	}

	static void ShowHelp(bool full) {
	if (role == kUnzip) {
	fprintf(full ? stdout : stderr, "usage: unzip [-d DIR] [-lnopqv] ZIP [FILE...] [-x FILE...]\n");
	if (!full) exit(EXIT_FAILURE);

	printf(
	"\n"
	"Extract FILEs from ZIP archive. Default is all files. Both the include and\n"
	"exclude (-x) lists use shell glob patterns.\n"
	"\n"
	"-d DIR Extract into DIR\n"
	"-l List contents (-lq excludes archive name, -lv is verbose)\n"
	"-n Never overwrite files (default: prompt)\n"
	"-o Always overwrite files\n"
	"-p Pipe to stdout\n"
	"-q Quiet\n"
	"-v List contents verbosely\n"
	"-x FILE Exclude files\n");
	} else {
	fprintf(full ? stdout : stderr, "usage: zipinfo [-1] ZIP [FILE...] [-x FILE...]\n");
	if (!full) exit(EXIT_FAILURE);

	printf(
	"\n"
	"Show information about FILEs from ZIP archive. Default is all files.\n"
	"Both the include and exclude (-x) lists use shell glob patterns.\n"
	"\n"
	"-1 Show filenames only, one per line\n"
	"-x FILE Exclude files\n");
	}
	exit(EXIT_SUCCESS);
	}

	static void HandleCommonOption(int opt) {
	switch (opt) {
	case 'h':
	ShowHelp(true);
	break;
	case 'x':
	flag_x = true;
	break;
	case 1:
	// -x swallows all following arguments, so we use '-' in the getopt
	// string and collect files here.
	if (!archive_name) {
	archive_name = optarg;
	} else if (flag_x) {
	excludes.insert(optarg);
	} else {
	includes.insert(optarg);
	}
	break;
	default:
	ShowHelp(false);
	break;
	}
	}

	int main(int argc, char* argv[]) {
	// Who am I, and what am I doing?
	g_progname = basename(argv[0]);
	if (!strcmp(g_progname, "ziptool") && argc > 1) return main(argc - 1, argv + 1);
	if (!strcmp(g_progname, "unzip")) {
	role = kUnzip;
	} else if (!strcmp(g_progname, "zipinfo")) {
	role = kZipinfo;
	} else {
	die(0, "run as ziptool with unzip or zipinfo as the first argument, or symlink");
	}

	static const struct option opts[] = {
	{"help", no_argument, 0, 'h'},
	};

	if (role == kUnzip) {
	// `unzip -Z` is "zipinfo mode", so in that case just restart...
	if (argc > 1 && !strcmp(argv[1], "-Z")) {
	argv[1] = const_cast<char*>("zipinfo");
	return main(argc - 1, argv + 1);
	}

	int opt;
	while ((opt = getopt_long(argc, argv, "-d:hlnopqvx", opts, nullptr)) != -1) {
	switch (opt) {
	case 'd':
	flag_d = optarg;
	break;
	case 'l':
	flag_l = true;
	break;
	case 'n':
	overwrite_mode = kNever;
	break;
	case 'o':
	overwrite_mode = kAlways;
	break;
	case 'p':
	flag_p = flag_q = true;
	break;
	case 'q':
	flag_q = true;
	break;
	case 'v':
	flag_v = true;
	break;
	default:
	HandleCommonOption(opt);
	break;
	}
	}
	} else {
	int opt;
	while ((opt = getopt_long(argc, argv, "-1hx", opts, nullptr)) != -1) {
	switch (opt) {
	case '1':
	flag_1 = true;
	break;
	default:
	HandleCommonOption(opt);
	break;
	}
	}
	}

	if (!archive_name) die(0, "missing archive filename");

	// We can't support "-" to unzip from stdin because libziparchive relies on mmap.
	ZipArchiveHandle zah;
	int32_t err;
	if ((err = OpenArchive(archive_name, &zah)) != 0) {
	die(0, "couldn't open %s: %s", archive_name, ErrorCodeString(err));
	}

	// Implement -d by changing into that directory.
	// We'll create implicit directories based on paths in the zip file, but we
	// require that the -d directory already exists.
	if (flag_d && chdir(flag_d) == -1) die(errno, "couldn't chdir to %s", flag_d);

	ProcessAll(zah);

	CloseArchive(zah);
	return 0;
	}