Ejemplo n.º 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);
            }
        }