Exemple #1
0
        /// <inheritdoc/>
        public byte[] Read(IDataStorerEntry entry)
        {
            Validation.NotNull("Entry", entry);

            ZipReadOnlyStorerEntry zip64Entry = entry as ZipReadOnlyStorerEntry;

            if (zip64Entry == null)
            {
                throw new InvalidEntryException(entry.Path);
            }

            byte[] data  = null;
            int    count = (int)zip64Entry.Size;

            if (zip64Entry.CompressionMethod == CompressionMethod.Store)
            {
                data = new byte[count];
                Buffer.BlockCopy(this.zipFileData, (int)zip64Entry.FileOffset, data, 0, count);
            }
            else
            {
                data = ZLibUtils.Inflate(this.zipFileData, (int)zip64Entry.FileOffset, (int)zip64Entry.CompressedSize, count);
            }

            if (zip64Entry.CRC32 != CRC32.Calculate(data))
            {
                throw new InvalidEntryException(entry.Path);
            }

            return(data);
        }
Exemple #2
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        private void ZipReadOnlyStorer_OneFile_Test(bool isZip64, bool enableCompression)
        {
            byte[] data = null;

            if (isZip64)
            {
                data = enableCompression ? zip64OneFileDeflate : zip64OneFileStore;
            }
            else
            {
                data = enableCompression ? zip32OneFileDeflate : zip32OneFileStore;
            }

            IReadOnlyDataStorer storer = ZipReadOnlyStorer.FromData(data);

            ZipReadOnlyStorerEntry entry = storer.Entries.FindOrDefault(e => e.Path == filePath1) as ZipReadOnlyStorerEntry;

            Assert.NotNull(fileData.SequenceEqual(storer.Read(entry)));
        }
Exemple #3
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        private void ZipReadOnlyStorer_OneFile_Test(bool isZip64, bool enableCompression, Func <ZipReadOnlyStorerEntry, object> selectValue, object value)
        {
            byte[] data = null;

            if (isZip64)
            {
                data = enableCompression ? zip64OneFileDeflate : zip64OneFileStore;
            }
            else
            {
                data = enableCompression ? zip32OneFileDeflate : zip32OneFileStore;
            }

            IReadOnlyDataStorer storer = ZipReadOnlyStorer.FromData(data);

            ZipReadOnlyStorerEntry entry = storer.Entries.FindOrDefault(e => e.Path == filePath1) as ZipReadOnlyStorerEntry;

            Assert.AreEqual(value, selectValue(entry));
        }
Exemple #4
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        private void ZipReadOnlyStorer_TwoFiles_Test(bool isZip64, bool enableCompression)
        {
            byte[] data = null;

            if (isZip64)
            {
                data = enableCompression ? zip64TwoFilesDeflate : zip64TwoFilesStore;
            }
            else
            {
                data = enableCompression ? zip32TwoFilesDeflate : zip32TwoFilesStore;
            }

            IReadOnlyDataStorer storer = ZipReadOnlyStorer.FromData(data);

            IReadOnlyList <IDataStorerEntry> entries = storer.Entries;
            ZipReadOnlyStorerEntry           entry1  = entries.FindOrDefault(e => e.Path == filePath1) as ZipReadOnlyStorerEntry;
            ZipReadOnlyStorerEntry           entry2  = entries.FindOrDefault(e => e.Path == filePath2) as ZipReadOnlyStorerEntry;

            Assert.NotNull(fileData.SequenceEqual(storer.Read(entry1)));
            Assert.NotNull(fileData.SequenceEqual(storer.Read(entry2)));
        }
Exemple #5
0
        /// <summary>
        /// Creates a new read-only zip storer from the data.
        /// </summary>
        /// <param name="data"> The data. </param>
        /// <returns> New read-only zip storer. </returns>
        /// <exception cref="Localization.ValueNullException">
        /// The exception that is thrown when data is null.
        /// </exception>
        /// <exception cref="InvalidDataException">
        /// The exception that is thrown when data is invalid.
        /// </exception>
        public static IReadOnlyDataStorer FromData(params byte[] data)
        {
            Validation.NotNull("Data", data);

            const int cfhSize   = 46; // fixed size of the central file header
            const int lfhSize   = 30; // fixed size of the local file header
            const int lfnOffset = 26; // relative offset to the size of the file name (local header)
            const int lefOffset = 28; // relative offset to the size of the extra field (local header)

            int length = data.Length;

            if (length < 22)
            {
                // Min length of the zip data is more than or equals to 22 bytes
                throw new InvalidDataException();
            }

            int lastIndex         = length - 1;
            int max               = length - 5;
            int signaturePosition = -1;

            for (int i = max; i >= 0; i--)
            {
                signaturePosition = lastIndex - i - 4;

                if (BytesConverter.ToUInt32(data, signaturePosition) == endOfCentralDirRecordSignature)
                {
                    bool isZip64           = false;
                    long centralDirEntries = BytesConverter.ToUInt16(data, signaturePosition + 10);
                    long centralDirSize    = BytesConverter.ToUInt32(data, signaturePosition + 12);
                    long centralDirOffset  = BytesConverter.ToUInt32(data, signaturePosition + 16);

                    if (centralDirOffset == zip64CentralDirSignature) // It is a Zip64 file
                    {
                        isZip64 = true;

                        int zip64CentralDirLocatorOffset = signaturePosition - 20;
                        if (BytesConverter.ToUInt32(data, zip64CentralDirLocatorOffset) != zip64EndOfCentralDirLocatorSignature)
                        {
                            // Not a ZIP64 central dir locator
                            throw new InvalidDataException();
                        }

                        int zip64CentralDirRecordOffset = (int)BytesConverter.ToUInt32(data, zip64CentralDirLocatorOffset + 8);
                        if (BytesConverter.ToUInt32(data, zip64CentralDirRecordOffset) != zip64EndOfCentralDirRecordSignature)
                        {
                            // Not a ZIP64 central dir record
                            throw new InvalidDataException();
                        }

                        centralDirEntries = (long)BytesConverter.ToUInt64(data, zip64CentralDirRecordOffset + 32);
                        centralDirSize    = (long)BytesConverter.ToUInt64(data, zip64CentralDirRecordOffset + 40);
                        centralDirOffset  = (long)BytesConverter.ToUInt64(data, zip64CentralDirRecordOffset + 48);
                    }

                    int centralDirStartIndex = (int)centralDirOffset;
                    int centralDirEndIndex   = centralDirStartIndex + (int)centralDirSize;

                    IDataStorerEntry[] fileEntries = new IDataStorerEntry[centralDirEntries];
                    int index = 0;

                    for (int pointer = centralDirStartIndex; pointer < centralDirEndIndex;)
                    {
                        if (BytesConverter.ToUInt32(data, pointer) != centralDirectoryFileHeaderSignature)
                        {
                            // Not a ZIP64 central dir file header
                            throw new InvalidDataException();
                        }

                        // 4 bytes, central directory file header signature
                        // 2 bytes, version made by
                        // 2 bytes, version needed to extract (minimum)
                        // 2 bytes, general purpose bit flag
                        ushort method         = BytesConverter.ToUInt16(data, pointer + 10); // 2 bytes, compression method
                        uint   modifyTime     = BytesConverter.ToUInt32(data, pointer + 12); // 2+2 bytes, file last modification time and date
                        uint   crc32          = BytesConverter.ToUInt32(data, pointer + 16); // 4 bytes, CRC-32
                        uint   compressedSize = BytesConverter.ToUInt32(data, pointer + 20); // 4 bytes, compressed size
                        uint   fileSize       = BytesConverter.ToUInt32(data, pointer + 24); // 4 bytes, uncompressed size
                        ushort fileNameSize   = BytesConverter.ToUInt16(data, pointer + 28); // 2 bytes, file name length
                        ushort extraFieldSize = BytesConverter.ToUInt16(data, pointer + 30); // 2 bytes, extra field length
                        ushort commentSize    = BytesConverter.ToUInt16(data, pointer + 32); // 2 bytes, file comment length
                                                                                             // 2+2=4 bytes, disk number where file starts (disk=0), internal file attributes
                                                                                             // 4 bytes, External file attributes
                        uint headerOffset = BytesConverter.ToUInt32(data, pointer + 42);     // 4 bytes, relative offset of header

                        uint headerSize             = (uint)(cfhSize + fileNameSize + extraFieldSize + commentSize);
                        int  commentsPointer        = (int)(pointer + headerSize - commentSize);
                        int  extraFieldBlockPointer = commentsPointer - extraFieldSize;

                        while (true)
                        {
                            if (extraFieldBlockPointer >= commentsPointer)
                            {
                                break;
                            }

                            if (BytesConverter.ToUInt16(data, extraFieldBlockPointer) == zip64ExtraBlockTagSignature)
                            {
                                if (fileSize == zip64CentralDirSignature)
                                {
                                    fileSize = BytesConverter.ToUInt32(data, extraFieldBlockPointer + 12);
                                }

                                if (compressedSize == zip64CentralDirSignature)
                                {
                                    compressedSize = BytesConverter.ToUInt32(data, extraFieldBlockPointer + 20);
                                }

                                if (headerOffset == zip64CentralDirSignature)
                                {
                                    headerOffset = BytesConverter.ToUInt32(data, extraFieldBlockPointer + 28);
                                }

                                break;
                            }
                            else
                            {
                                extraFieldBlockPointer += BytesConverter.ToUInt16(data, extraFieldBlockPointer + 2);
                            }
                        }

                        if (BytesConverter.ToUInt32(data, (int)headerOffset) != localFileHeaderSignature)
                        {
                            throw new InvalidDataException();
                        }

                        uint lfeSize = (uint)(BytesConverter.ToUInt16(data, (int)headerOffset + lfnOffset) + BytesConverter.ToUInt16(data, (int)headerOffset + lefOffset));

                        ZipReadOnlyStorerEntry fileEntry = new ZipReadOnlyStorerEntry(
                            utf8Encoding.GetString(data, cfhSize + pointer, fileNameSize),
                            fileSize,
                            (CompressionMethod)method,
                            compressedSize,
                            headerOffset,
                            (uint)(lfhSize + lfeSize + headerOffset),
                            crc32,
                            ZipStorerUtils.DosTimeToDateTime(modifyTime),
                            (commentSize > 0) ? utf8Encoding.GetString(data, (int)(pointer + headerSize - commentSize), commentSize) : ""
                            );

                        fileEntries[index++] = fileEntry;
                        pointer += (int)headerSize;
                    }

                    return(new ZipReadOnlyStorer(isZip64, data, fileEntries));
                }
            }

            throw new InvalidDataException();
        }