Function ValidateDataDescriptor

Bcore/src/main/cpp/ziparchive/zip_archive.cc:460–490

}

static int32_t ValidateDataDescriptor(MappedZipFile& mapped_zip, ZipEntry* entry) {
  uint8_t ddBuf[sizeof(DataDescriptor) + sizeof(DataDescriptor::kOptSignature)];
  off64_t offset = entry->offset;
  if (entry->method != kCompressStored) {
    offset += entry->compressed_length;
  } else {
    offset += entry->uncompressed_length;
  }

  if (!mapped_zip.ReadAtOffset(ddBuf, sizeof(ddBuf), offset)) {
    return kIoError;
  }

  const uint32_t ddSignature = *(reinterpret_cast<const uint32_t*>(ddBuf));
  const uint16_t ddOffset = (ddSignature == DataDescriptor::kOptSignature) ? 4 : 0;
  const DataDescriptor* descriptor = reinterpret_cast<const DataDescriptor*>(ddBuf + ddOffset);

  // Validate that the values in the data descriptor match those in the central
  // directory.
  if (entry->compressed_length != descriptor->compressed_size ||
      entry->uncompressed_length != descriptor->uncompressed_size ||
      entry->crc32 != descriptor->crc32) {
    //chensenhua  ALOGW("Zip: size/crc32 mismatch. expected {%" PRIu32 ", %" PRIu32 ", %" PRIx32
    //chensenhua      "}, was {%" PRIu32 ", %" PRIu32 ", %" PRIx32 "}",
    //chensenhua     entry->compressed_length, entry->uncompressed_length, entry->crc32,
    //chensenhua     descriptor->compressed_size, descriptor->uncompressed_size, descriptor->crc32);
    return kInconsistentInformation;
  }

  return 0;
}

static int32_t FindEntry(const ZipArchive* archive, const int ent, ZipEntry* data) {
  const uint16_t nameLen = archive->hash_table[ent].name_length;