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-rw-r--r--libziparchive/zip_archive.cc271
-rw-r--r--libziparchive/zip_archive_test.cc88
2 files changed, 269 insertions, 90 deletions
diff --git a/libziparchive/zip_archive.cc b/libziparchive/zip_archive.cc
index 858234446..4ba91dfb9 100644
--- a/libziparchive/zip_archive.cc
+++ b/libziparchive/zip_archive.cc
@@ -85,7 +85,8 @@ struct EocdRecord {
// Length of the central directory comment.
uint16_t comment_length;
private:
- DISALLOW_IMPLICIT_CONSTRUCTORS(EocdRecord);
+ EocdRecord() = default;
+ DISALLOW_COPY_AND_ASSIGN(EocdRecord);
} __attribute__((packed));
// A structure representing the fixed length fields for a single
@@ -138,7 +139,8 @@ struct CentralDirectoryRecord {
// beginning of this archive.
uint32_t local_file_header_offset;
private:
- DISALLOW_IMPLICIT_CONSTRUCTORS(CentralDirectoryRecord);
+ CentralDirectoryRecord() = default;
+ DISALLOW_COPY_AND_ASSIGN(CentralDirectoryRecord);
} __attribute__((packed));
// The local file header for a given entry. This duplicates information
@@ -175,7 +177,8 @@ struct LocalFileHeader {
// will appear immediately after the entry file name.
uint16_t extra_field_length;
private:
- DISALLOW_IMPLICIT_CONSTRUCTORS(LocalFileHeader);
+ LocalFileHeader() = default;
+ DISALLOW_COPY_AND_ASSIGN(LocalFileHeader);
} __attribute__((packed));
struct DataDescriptor {
@@ -189,10 +192,10 @@ struct DataDescriptor {
// Uncompressed size of the entry.
uint32_t uncompressed_size;
private:
- DISALLOW_IMPLICIT_CONSTRUCTORS(DataDescriptor);
+ DataDescriptor() = default;
+ DISALLOW_COPY_AND_ASSIGN(DataDescriptor);
} __attribute__((packed));
-#undef DISALLOW_IMPLICIT_CONSTRUCTORS
static const uint32_t kGPBDDFlagMask = 0x0008; // mask value that signifies that the entry has a DD
@@ -324,35 +327,6 @@ struct ZipArchive {
}
};
-static int32_t CopyFileToFile(int fd, uint8_t* begin, const uint32_t length, uint64_t *crc_out) {
- static const uint32_t kBufSize = 32768;
- uint8_t buf[kBufSize];
-
- uint32_t count = 0;
- uint64_t crc = 0;
- while (count < length) {
- uint32_t remaining = length - count;
-
- // Safe conversion because kBufSize is narrow enough for a 32 bit signed
- // value.
- ssize_t get_size = (remaining > kBufSize) ? kBufSize : remaining;
- ssize_t actual = TEMP_FAILURE_RETRY(read(fd, buf, get_size));
-
- if (actual != get_size) {
- ALOGW("CopyFileToFile: copy read failed (" ZD " vs " ZD ")", actual, get_size);
- return kIoError;
- }
-
- memcpy(begin + count, buf, get_size);
- crc = crc32(crc, buf, get_size);
- count += get_size;
- }
-
- *crc_out = crc;
-
- return 0;
-}
-
/*
* Round up to the next highest power of 2.
*
@@ -972,6 +946,128 @@ int32_t Next(void* cookie, ZipEntry* data, ZipEntryName* name) {
return kIterationEnd;
}
+class Writer {
+ public:
+ virtual bool Append(uint8_t* buf, size_t buf_size) = 0;
+ virtual ~Writer() {}
+ protected:
+ Writer() = default;
+ private:
+ DISALLOW_COPY_AND_ASSIGN(Writer);
+};
+
+// A Writer that writes data to a fixed size memory region.
+// The size of the memory region must be equal to the total size of
+// the data appended to it.
+class MemoryWriter : public Writer {
+ public:
+ MemoryWriter(uint8_t* buf, size_t size) : Writer(),
+ buf_(buf), size_(size), bytes_written_(0) {
+ }
+
+ virtual bool Append(uint8_t* buf, size_t buf_size) override {
+ if (bytes_written_ + buf_size > size_) {
+ ALOGW("Zip: Unexpected size " ZD " (declared) vs " ZD " (actual)",
+ size_, bytes_written_ + buf_size);
+ return false;
+ }
+
+ memcpy(buf_ + bytes_written_, buf, buf_size);
+ bytes_written_ += buf_size;
+ return true;
+ }
+
+ private:
+ uint8_t* const buf_;
+ const size_t size_;
+ size_t bytes_written_;
+};
+
+// A Writer that appends data to a file |fd| at its current position.
+// The file will be truncated to the end of the written data.
+class FileWriter : public Writer {
+ public:
+
+ // Creates a FileWriter for |fd| and prepare to write |entry| to it,
+ // guaranteeing that the file descriptor is valid and that there's enough
+ // space on the volume to write out the entry completely and that the file
+ // is truncated to the correct length.
+ //
+ // Returns a valid FileWriter on success, |nullptr| if an error occurred.
+ static std::unique_ptr<FileWriter> Create(int fd, const ZipEntry* entry) {
+ const uint32_t declared_length = entry->uncompressed_length;
+ const off64_t current_offset = lseek64(fd, 0, SEEK_CUR);
+ if (current_offset == -1) {
+ ALOGW("Zip: unable to seek to current location on fd %d: %s", fd, strerror(errno));
+ return nullptr;
+ }
+
+ int result = 0;
+#if defined(__linux__)
+ if (declared_length > 0) {
+ // Make sure we have enough space on the volume to extract the compressed
+ // entry. Note that the call to ftruncate below will change the file size but
+ // will not allocate space on disk and this call to fallocate will not
+ // change the file size.
+ result = TEMP_FAILURE_RETRY(fallocate(fd, 0, current_offset, declared_length));
+ if (result == -1) {
+ ALOGW("Zip: unable to allocate space for file to %" PRId64 ": %s",
+ static_cast<int64_t>(declared_length + current_offset), strerror(errno));
+ return std::unique_ptr<FileWriter>(nullptr);
+ }
+ }
+#endif // __linux__
+
+ result = TEMP_FAILURE_RETRY(ftruncate(fd, declared_length + current_offset));
+ if (result == -1) {
+ ALOGW("Zip: unable to truncate file to %" PRId64 ": %s",
+ static_cast<int64_t>(declared_length + current_offset), strerror(errno));
+ return std::unique_ptr<FileWriter>(nullptr);
+ }
+
+ return std::unique_ptr<FileWriter>(new FileWriter(fd, declared_length));
+ }
+
+ virtual bool Append(uint8_t* buf, size_t buf_size) override {
+ if (total_bytes_written_ + buf_size > declared_length_) {
+ ALOGW("Zip: Unexpected size " ZD " (declared) vs " ZD " (actual)",
+ declared_length_, total_bytes_written_ + buf_size);
+ return false;
+ }
+
+ // Keep track of the start position so we can calculate the
+ // total number of bytes written.
+ const uint8_t* const start = buf;
+ size_t bytes_written = 0;
+ while (buf_size > 0) {
+ ssize_t bytes_written = TEMP_FAILURE_RETRY(write(fd_, buf, buf_size));
+ if (bytes_written == -1) {
+ ALOGW("Zip: unable to write " ZD " bytes to file; %s", buf_size, strerror(errno));
+ return false;
+ }
+
+ buf_size -= bytes_written;
+ buf += bytes_written;
+ }
+
+ total_bytes_written_ += static_cast<size_t>(
+ reinterpret_cast<uintptr_t>(buf) - reinterpret_cast<uintptr_t>(start));
+
+ return true;
+ }
+ private:
+ FileWriter(const int fd, const size_t declared_length) :
+ Writer(),
+ fd_(fd),
+ declared_length_(declared_length),
+ total_bytes_written_(0) {
+ }
+
+ const int fd_;
+ const size_t declared_length_;
+ size_t total_bytes_written_;
+};
+
// This method is using libz macros with old-style-casts
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wold-style-cast"
@@ -980,9 +1076,8 @@ static inline int zlib_inflateInit2(z_stream* stream, int window_bits) {
}
#pragma GCC diagnostic pop
-static int32_t InflateToFile(int fd, const ZipEntry* entry,
- uint8_t* begin, uint32_t length,
- uint64_t* crc_out) {
+static int32_t InflateEntryToWriter(int fd, const ZipEntry* entry,
+ Writer* writer, uint64_t* crc_out) {
const size_t kBufSize = 32768;
std::vector<uint8_t> read_buf(kBufSize);
std::vector<uint8_t> write_buf(kBufSize);
@@ -1057,12 +1152,10 @@ static int32_t InflateToFile(int fd, const ZipEntry* entry,
if (zstream.avail_out == 0 ||
(zerr == Z_STREAM_END && zstream.avail_out != kBufSize)) {
const size_t write_size = zstream.next_out - &write_buf[0];
- // The file might have declared a bogus length.
- if (write_size + write_count > length) {
- return -1;
+ if (!writer->Append(&write_buf[0], write_size)) {
+ // The file might have declared a bogus length.
+ return kInconsistentInformation;
}
- memcpy(begin + write_count, &write_buf[0], write_size);
- write_count += write_size;
zstream.next_out = &write_buf[0];
zstream.avail_out = kBufSize;
@@ -1083,8 +1176,41 @@ static int32_t InflateToFile(int fd, const ZipEntry* entry,
return 0;
}
-int32_t ExtractToMemory(ZipArchiveHandle handle,
- ZipEntry* entry, uint8_t* begin, uint32_t size) {
+static int32_t CopyEntryToWriter(int fd, const ZipEntry* entry, Writer* writer,
+ uint64_t *crc_out) {
+ static const uint32_t kBufSize = 32768;
+ std::vector<uint8_t> buf(kBufSize);
+
+ const uint32_t length = entry->uncompressed_length;
+ uint32_t count = 0;
+ uint64_t crc = 0;
+ while (count < length) {
+ uint32_t remaining = length - count;
+
+ // Safe conversion because kBufSize is narrow enough for a 32 bit signed
+ // value.
+ const ssize_t block_size = (remaining > kBufSize) ? kBufSize : remaining;
+ const ssize_t actual = TEMP_FAILURE_RETRY(read(fd, &buf[0], block_size));
+
+ if (actual != block_size) {
+ ALOGW("CopyFileToFile: copy read failed (" ZD " vs " ZD ")", actual, block_size);
+ return kIoError;
+ }
+
+ if (!writer->Append(&buf[0], block_size)) {
+ return kIoError;
+ }
+ crc = crc32(crc, &buf[0], block_size);
+ count += block_size;
+ }
+
+ *crc_out = crc;
+
+ return 0;
+}
+
+int32_t ExtractToWriter(ZipArchiveHandle handle,
+ ZipEntry* entry, Writer* writer) {
ZipArchive* archive = reinterpret_cast<ZipArchive*>(handle);
const uint16_t method = entry->method;
off64_t data_offset = entry->offset;
@@ -1098,9 +1224,9 @@ int32_t ExtractToMemory(ZipArchiveHandle handle,
int32_t return_value = -1;
uint64_t crc = 0;
if (method == kCompressStored) {
- return_value = CopyFileToFile(archive->fd, begin, size, &crc);
+ return_value = CopyEntryToWriter(archive->fd, entry, writer, &crc);
} else if (method == kCompressDeflated) {
- return_value = InflateToFile(archive->fd, entry, begin, size, &crc);
+ return_value = InflateEntryToWriter(archive->fd, entry, writer, &crc);
}
if (!return_value && entry->has_data_descriptor) {
@@ -1120,55 +1246,20 @@ int32_t ExtractToMemory(ZipArchiveHandle handle,
return return_value;
}
+int32_t ExtractToMemory(ZipArchiveHandle handle, ZipEntry* entry,
+ uint8_t* begin, uint32_t size) {
+ std::unique_ptr<Writer> writer(new MemoryWriter(begin, size));
+ return ExtractToWriter(handle, entry, writer.get());
+}
+
int32_t ExtractEntryToFile(ZipArchiveHandle handle,
ZipEntry* entry, int fd) {
- const uint32_t declared_length = entry->uncompressed_length;
-
- const off64_t current_offset = lseek64(fd, 0, SEEK_CUR);
- if (current_offset == -1) {
- ALOGW("Zip: unable to seek to current location on fd %d: %s", fd,
- strerror(errno));
+ std::unique_ptr<Writer> writer(FileWriter::Create(fd, entry));
+ if (writer.get() == nullptr) {
return kIoError;
}
- int result = 0;
-#if defined(__linux__)
- // Make sure we have enough space on the volume to extract the compressed
- // entry. Note that the call to ftruncate below will change the file size but
- // will not allocate space on disk.
- if (declared_length > 0) {
- result = TEMP_FAILURE_RETRY(fallocate(fd, 0, current_offset, declared_length));
- if (result == -1) {
- ALOGW("Zip: unable to allocate space for file to %" PRId64 ": %s",
- static_cast<int64_t>(declared_length + current_offset), strerror(errno));
- return kIoError;
- }
- }
-#endif // defined(__linux__)
-
- result = TEMP_FAILURE_RETRY(ftruncate(fd, declared_length + current_offset));
- if (result == -1) {
- ALOGW("Zip: unable to truncate file to %" PRId64 ": %s",
- static_cast<int64_t>(declared_length + current_offset), strerror(errno));
- return kIoError;
- }
-
- // Don't attempt to map a region of length 0. We still need the
- // ftruncate() though, since the API guarantees that we will truncate
- // the file to the end of the uncompressed output.
- if (declared_length == 0) {
- return 0;
- }
-
- android::FileMap map;
- if (!map.create(kTempMappingFileName, fd, current_offset, declared_length, false)) {
- return kMmapFailed;
- }
-
- const int32_t error = ExtractToMemory(handle, entry,
- reinterpret_cast<uint8_t*>(map.getDataPtr()),
- map.getDataLength());
- return error;
+ return ExtractToWriter(handle, entry, writer.get());
}
const char* ErrorCodeString(int32_t error_code) {
diff --git a/libziparchive/zip_archive_test.cc b/libziparchive/zip_archive_test.cc
index 64faa6de2..f8952ce65 100644
--- a/libziparchive/zip_archive_test.cc
+++ b/libziparchive/zip_archive_test.cc
@@ -23,6 +23,7 @@
#include <unistd.h>
#include <vector>
+#include <base/file.h>
#include <gtest/gtest.h>
static std::string test_data_dir;
@@ -228,6 +229,44 @@ static const uint32_t kEmptyEntriesZip[] = {
0x54557478, 0x13030005, 0x7552e25c, 0x01000b78, 0x00428904, 0x13880400,
0x4b500000, 0x00000605, 0x00010000, 0x004f0001, 0x00430000, 0x00000000 };
+// This is a zip file containing a single entry (ab.txt) that contains
+// 90072 repetitions of the string "ab\n" and has an uncompressed length
+// of 270216 bytes.
+static const uint16_t kAbZip[] = {
+ 0x4b50, 0x0403, 0x0014, 0x0000, 0x0008, 0x51d2, 0x4698, 0xc4b0,
+ 0x2cda, 0x011b, 0x0000, 0x1f88, 0x0004, 0x0006, 0x001c, 0x6261,
+ 0x742e, 0x7478, 0x5455, 0x0009, 0x7c03, 0x3a09, 0x7c55, 0x3a09,
+ 0x7555, 0x0b78, 0x0100, 0x8904, 0x0042, 0x0400, 0x1388, 0x0000,
+ 0xc2ed, 0x0d31, 0x0000, 0x030c, 0x7fa0, 0x3b2e, 0x22ff, 0xa2aa,
+ 0x841f, 0x45fc, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555, 0x5555,
+ 0x5555, 0x5555, 0x5555, 0x5555, 0xdd55, 0x502c, 0x014b, 0x1e02,
+ 0x1403, 0x0000, 0x0800, 0xd200, 0x9851, 0xb046, 0xdac4, 0x1b2c,
+ 0x0001, 0x8800, 0x041f, 0x0600, 0x1800, 0x0000, 0x0000, 0x0100,
+ 0x0000, 0xa000, 0x0081, 0x0000, 0x6100, 0x2e62, 0x7874, 0x5574,
+ 0x0554, 0x0300, 0x097c, 0x553a, 0x7875, 0x000b, 0x0401, 0x4289,
+ 0x0000, 0x8804, 0x0013, 0x5000, 0x054b, 0x0006, 0x0000, 0x0100,
+ 0x0100, 0x4c00, 0x0000, 0x5b00, 0x0001, 0x0000, 0x0000
+};
+
+static const uint8_t kAbTxtName[] = { 'a', 'b', '.', 't', 'x', 't' };
+static const uint16_t kAbTxtNameLength = sizeof(kAbTxtName);
+static const size_t kAbUncompressedSize = 270216;
+
static int make_temporary_file(const char* file_name_pattern) {
char full_path[1024];
// Account for differences between the host and the target.
@@ -275,6 +314,55 @@ TEST(ziparchive, EmptyEntries) {
close(output_fd);
}
+TEST(ziparchive, EntryLargerThan32K) {
+ char temp_file_pattern[] = "entry_larger_than_32k_test_XXXXXX";
+ int fd = make_temporary_file(temp_file_pattern);
+ ASSERT_NE(-1, fd);
+ ASSERT_TRUE(android::base::WriteFully(fd, reinterpret_cast<const uint8_t*>(kAbZip),
+ sizeof(kAbZip) - 1));
+ ZipArchiveHandle handle;
+ ASSERT_EQ(0, OpenArchiveFd(fd, "EntryLargerThan32KTest", &handle));
+
+ ZipEntry entry;
+ ZipEntryName ab_name;
+ ab_name.name = kAbTxtName;
+ ab_name.name_length = kAbTxtNameLength;
+ ASSERT_EQ(0, FindEntry(handle, ab_name, &entry));
+ ASSERT_EQ(kAbUncompressedSize, entry.uncompressed_length);
+
+ // Extract the entry to memory.
+ std::vector<uint8_t> buffer(kAbUncompressedSize);
+ ASSERT_EQ(0, ExtractToMemory(handle, &entry, &buffer[0], buffer.size()));
+
+ // Extract the entry to a file.
+ char output_file_pattern[] = "entry_larger_than_32k_test_output_XXXXXX";
+ int output_fd = make_temporary_file(output_file_pattern);
+ ASSERT_NE(-1, output_fd);
+ ASSERT_EQ(0, ExtractEntryToFile(handle, &entry, output_fd));
+
+ // Make sure the extracted file size is as expected.
+ struct stat stat_buf;
+ ASSERT_EQ(0, fstat(output_fd, &stat_buf));
+ ASSERT_EQ(kAbUncompressedSize, static_cast<size_t>(stat_buf.st_size));
+
+ // Read the file back to a buffer and make sure the contents are
+ // the same as the memory buffer we extracted directly to.
+ std::vector<uint8_t> file_contents(kAbUncompressedSize);
+ ASSERT_EQ(0, lseek64(output_fd, 0, SEEK_SET));
+ ASSERT_TRUE(android::base::ReadFully(output_fd, &file_contents[0], file_contents.size()));
+ ASSERT_EQ(file_contents, buffer);
+
+ for (int i = 0; i < 90072; ++i) {
+ const uint8_t* line = &file_contents[0] + (3 * i);
+ ASSERT_EQ('a', line[0]);
+ ASSERT_EQ('b', line[1]);
+ ASSERT_EQ('\n', line[2]);
+ }
+
+ close(fd);
+ close(output_fd);
+}
+
TEST(ziparchive, TrailerAfterEOCD) {
char temp_file_pattern[] = "trailer_after_eocd_test_XXXXXX";
int fd = make_temporary_file(temp_file_pattern);