Example #1
0
        // Write the local file header
        // TODO: ZipHelperStream.WriteLocalHeader is not yet used and needs checking for ZipFile and ZipOuptutStream usage
        void WriteLocalHeader(ZipEntry entry, EntryPatchData patchData)
        {
            CompressionMethod method = entry.CompressionMethod;
            bool headerInfoAvailable = true; // How to get this?
            bool patchEntryHeader = false;

            WriteLEInt(ZipConstants.LocalHeaderSignature);

            WriteLEShort(entry.Version);
            WriteLEShort(entry.Flags);
            WriteLEShort((byte)method);
            WriteLEInt((int)entry.DosTime);

            if (headerInfoAvailable == true)
            {
                WriteLEInt((int)entry.Crc);
                if (entry.LocalHeaderRequiresZip64)
                {
                    WriteLEInt(-1);
                    WriteLEInt(-1);
                }
                else
                {
                    WriteLEInt(entry.IsCrypted ? (int)entry.CompressedSize + ZipConstants.CryptoHeaderSize : (int)entry.CompressedSize);
                    WriteLEInt((int)entry.Size);
                }
            }
            else
            {
                if (patchData != null)
                {
                    patchData.CrcPatchOffset = stream_.Position;
                }
                WriteLEInt(0);	// Crc

                if (patchData != null)
                {
                    patchData.SizePatchOffset = stream_.Position;
                }

                // For local header both sizes appear in Zip64 Extended Information
                if (entry.LocalHeaderRequiresZip64 && patchEntryHeader)
                {
                    WriteLEInt(-1);
                    WriteLEInt(-1);
                }
                else
                {
                    WriteLEInt(0);	// Compressed size
                    WriteLEInt(0);	// Uncompressed size
                }
            }

            byte[] name = ZipConstants.ConvertToArray(entry.Flags, entry.Name);

            if (name.Length > 0xFFFF)
            {
                throw new ZipException("Entry name too long.");
            }

            ZipExtraData ed = new ZipExtraData(entry.ExtraData);

            if (entry.LocalHeaderRequiresZip64 && (headerInfoAvailable || patchEntryHeader))
            {
                ed.StartNewEntry();
                if (headerInfoAvailable)
                {
                    ed.AddLeLong(entry.Size);
                    ed.AddLeLong(entry.CompressedSize);
                }
                else
                {
                    ed.AddLeLong(-1);
                    ed.AddLeLong(-1);
                }
                ed.AddNewEntry(1);

                if (!ed.Find(1))
                {
                    throw new ZipException("Internal error cant find extra data");
                }

                if (patchData != null)
                {
                    patchData.SizePatchOffset = ed.CurrentReadIndex;
                }
            }
            else
            {
                ed.Delete(1);
            }

            byte[] extra = ed.GetEntryData();

            WriteLEShort(name.Length);
            WriteLEShort(extra.Length);

            if (name.Length > 0)
            {
                stream_.Write(name, 0, name.Length);
            }

            if (entry.LocalHeaderRequiresZip64 && patchEntryHeader)
            {
                patchData.SizePatchOffset += stream_.Position;
            }

            if (extra.Length > 0)
            {
                stream_.Write(extra, 0, extra.Length);
            }
        }
Example #2
0
        public ZipEntry(ZipEntry entry)
        {
            if (entry == null)
            {
                throw new ArgumentNullException("entry");
            }

            known = entry.known;
            name = entry.name;
            size = entry.size;
            compressedSize = entry.compressedSize;
            crc = entry.crc;
            dosTime = entry.dosTime;
            method = entry.method;
            comment = entry.comment;
            versionToExtract = entry.versionToExtract;
            versionMadeBy = entry.versionMadeBy;
            externalFileAttributes = entry.externalFileAttributes;
            flags = entry.flags;

            zipFileIndex = entry.zipFileIndex;
            offset = entry.offset;

            forceZip64_ = entry.forceZip64_;

            if (entry.extra != null)
            {
                extra = new byte[entry.extra.Length];
                Array.Copy(entry.extra, 0, extra, 0, entry.extra.Length);
            }
        }
Example #3
0
        /// <summary>
        /// Write a data descriptor.
        /// </summary>
        /// <param name="entry">The entry to write a descriptor for.</param>
        /// <returns>Returns the number of descriptor bytes written.</returns>
        public int WriteDataDescriptor(ZipEntry entry)
        {
            if (entry == null)
            {
                throw new ArgumentNullException("entry");
            }

            int result = 0;

            // Add data descriptor if flagged as required
            if ((entry.Flags & (int)GeneralBitFlags.Descriptor) != 0)
            {
                // The signature is not PKZIP originally but is now described as optional
                // in the PKZIP Appnote documenting trhe format.
                WriteLEInt(ZipConstants.DataDescriptorSignature);
                WriteLEInt(unchecked((int)(entry.Crc)));

                result += 8;

                if (entry.LocalHeaderRequiresZip64)
                {
                    WriteLELong(entry.CompressedSize);
                    WriteLELong(entry.Size);
                    result += 16;
                }
                else
                {
                    WriteLEInt((int)entry.CompressedSize);
                    WriteLEInt((int)entry.Size);
                    result += 8;
                }
            }

            return result;
        }