Example #1
0
        internal ZipFileHeader(ZipFileInfo fileInfo, bool zip64)
            : this()
        {
            this.flags             = ZipFileFlags.None;
            this.compressionMethod = fileInfo.CompressionMethod;
            this.fileName          = Path.Combine(fileInfo.Path, fileInfo.Name);
            CompressionEngine.DateTimeToDosDateAndTime(
                fileInfo.LastWriteTime, out this.lastModDate, out this.lastModTime);
            this.zip64 = zip64;

            if (this.zip64)
            {
                this.compressedSize   = UInt32.MaxValue;
                this.uncompressedSize = UInt32.MaxValue;
                this.diskStart        = UInt16.MaxValue;
                this.versionMadeBy    = 45;
                this.versionNeeded    = 45;
                ZipExtraFileField field = new ZipExtraFileField();
                field.fieldType = ZipExtraFileFieldType.ZIP64;
                field.SetZip64Data(
                    fileInfo.CompressedLength,
                    fileInfo.Length,
                    0,
                    fileInfo.ArchiveNumber);
                this.extraFields = new ZipExtraFileField[] { field };
            }
            else
            {
                this.compressedSize   = (uint)fileInfo.CompressedLength;
                this.uncompressedSize = (uint)fileInfo.Length;
                this.diskStart        = (ushort)fileInfo.ArchiveNumber;
            }
        }
Example #2
0
        internal bool Read(Stream stream, bool central)
        {
            long startPos = stream.Position;

            if (stream.Length - startPos <
                (central ? CFH_FIXEDSIZE : LFH_FIXEDSIZE))
            {
                return false;
            }

            BinaryReader reader = new BinaryReader(stream);
            uint sig = reader.ReadUInt32();

            if (sig == SPANSIG || sig == SPANSIG2)
            {
                // Spanned zip files may optionally begin with a special marker.
                // Just ignore it and move on.
                sig = reader.ReadUInt32();
            }

            if (sig != (central ? CFHSIG : LFHSIG))
            {
                return false;
            }

            this.versionMadeBy = (central ? reader.ReadUInt16() : (ushort) 0);
            this.versionNeeded = reader.ReadUInt16();
            this.flags = (ZipFileFlags) reader.ReadUInt16();
            this.compressionMethod = (ZipCompressionMethod) reader.ReadUInt16();
            this.lastModTime = reader.ReadInt16();
            this.lastModDate = reader.ReadInt16();
            this.crc32 = reader.ReadUInt32();
            this.compressedSize = reader.ReadUInt32();
            this.uncompressedSize = reader.ReadUInt32();

            this.zip64 = this.uncompressedSize == UInt32.MaxValue;

            int fileNameLength = reader.ReadUInt16();
            int extraFieldLength = reader.ReadUInt16();
            int fileCommentLength;

            if (central)
            {
                fileCommentLength = reader.ReadUInt16();

                this.diskStart = reader.ReadUInt16();
                this.internalFileAttrs = reader.ReadUInt16();
                this.externalFileAttrs = reader.ReadUInt32();
                this.localHeaderOffset = reader.ReadUInt32();
            }
            else
            {
                fileCommentLength = 0;
                this.diskStart = 0;
                this.internalFileAttrs = 0;
                this.externalFileAttrs = 0;
                this.localHeaderOffset = 0;
            }

            if (stream.Length - stream.Position <
                fileNameLength + extraFieldLength + fileCommentLength)
            {
                return false;
            }

            Encoding headerEncoding = ((this.flags | ZipFileFlags.UTF8) != 0 ?
                Encoding.UTF8 : Encoding.GetEncoding(CultureInfo.CurrentCulture.TextInfo.OEMCodePage));

            byte[] fileNameBytes = reader.ReadBytes(fileNameLength);
            this.fileName = headerEncoding.GetString(fileNameBytes);

            List<ZipExtraFileField> fields = new List<ZipExtraFileField>();
            while (extraFieldLength > 0)
            {
                ZipExtraFileField field = new ZipExtraFileField();
                if (!field.Read(stream, ref extraFieldLength))
                {
                    return false;
                }
                fields.Add(field);
                if (field.fieldType == ZipExtraFileFieldType.ZIP64)
                {
                    this.zip64 = true;
                }
            }
            this.extraFields = fields.ToArray();

            byte[] fileCommentBytes = reader.ReadBytes(fileCommentLength);
            this.fileComment = headerEncoding.GetString(fileCommentBytes);

            return true;
        }
Example #3
0
        internal bool Read(Stream stream, bool central)
        {
            long startPos = stream.Position;

            if (stream.Length - startPos <
                (central ? CFH_FIXEDSIZE : LFH_FIXEDSIZE))
            {
                return(false);
            }

            BinaryReader reader = new BinaryReader(stream);
            uint         sig    = reader.ReadUInt32();

            if (sig == SPANSIG || sig == SPANSIG2)
            {
                // Spanned zip files may optionally begin with a special marker.
                // Just ignore it and move on.
                sig = reader.ReadUInt32();
            }

            if (sig != (central ? CFHSIG : LFHSIG))
            {
                return(false);
            }

            this.versionMadeBy     = (central ? reader.ReadUInt16() : (ushort)0);
            this.versionNeeded     = reader.ReadUInt16();
            this.flags             = (ZipFileFlags)reader.ReadUInt16();
            this.compressionMethod = (ZipCompressionMethod)reader.ReadUInt16();
            this.lastModTime       = reader.ReadInt16();
            this.lastModDate       = reader.ReadInt16();
            this.crc32             = reader.ReadUInt32();
            this.compressedSize    = reader.ReadUInt32();
            this.uncompressedSize  = reader.ReadUInt32();

            this.zip64 = this.uncompressedSize == UInt32.MaxValue;

            int fileNameLength   = reader.ReadUInt16();
            int extraFieldLength = reader.ReadUInt16();
            int fileCommentLength;

            if (central)
            {
                fileCommentLength = reader.ReadUInt16();

                this.diskStart         = reader.ReadUInt16();
                this.internalFileAttrs = reader.ReadUInt16();
                this.externalFileAttrs = reader.ReadUInt32();
                this.localHeaderOffset = reader.ReadUInt32();
            }
            else
            {
                fileCommentLength      = 0;
                this.diskStart         = 0;
                this.internalFileAttrs = 0;
                this.externalFileAttrs = 0;
                this.localHeaderOffset = 0;
            }

            if (stream.Length - stream.Position <
                fileNameLength + extraFieldLength + fileCommentLength)
            {
                return(false);
            }

            Encoding headerEncoding = ((this.flags | ZipFileFlags.UTF8) != 0 ?
                                       Encoding.UTF8 : Encoding.GetEncoding(CultureInfo.CurrentCulture.TextInfo.OEMCodePage));

            byte[] fileNameBytes = reader.ReadBytes(fileNameLength);
            this.fileName = headerEncoding.GetString(fileNameBytes);

            List <ZipExtraFileField> fields = new List <ZipExtraFileField>();

            while (extraFieldLength > 0)
            {
                ZipExtraFileField field = new ZipExtraFileField();
                if (!field.Read(stream, ref extraFieldLength))
                {
                    return(false);
                }
                fields.Add(field);
                if (field.fieldType == ZipExtraFileFieldType.ZIP64)
                {
                    this.zip64 = true;
                }
            }
            this.extraFields = fields.ToArray();

            byte[] fileCommentBytes = reader.ReadBytes(fileCommentLength);
            this.fileComment = headerEncoding.GetString(fileCommentBytes);

            return(true);
        }
Example #4
0
        internal ZipFileHeader(ZipFileInfo fileInfo, bool zip64)
            : this()
        {
            this.flags = ZipFileFlags.None;
            this.compressionMethod = fileInfo.CompressionMethod;
            this.fileName = Path.Combine(fileInfo.Path, fileInfo.Name);
            CompressionEngine.DateTimeToDosDateAndTime(
                fileInfo.LastWriteTime, out this.lastModDate, out this.lastModTime);
            this.zip64 = zip64;

            if (this.zip64)
            {
                this.compressedSize = UInt32.MaxValue;
                this.uncompressedSize = UInt32.MaxValue;
                this.diskStart = UInt16.MaxValue;
                this.versionMadeBy = 45;
                this.versionNeeded = 45;
                ZipExtraFileField field = new ZipExtraFileField();
                field.fieldType = ZipExtraFileFieldType.ZIP64;
                field.SetZip64Data(
                    fileInfo.CompressedLength,
                    fileInfo.Length,
                    0,
                    fileInfo.ArchiveNumber);
                this.extraFields = new ZipExtraFileField[] { field };
            }
            else
            {
                this.compressedSize = (uint) fileInfo.CompressedLength;
                this.uncompressedSize = (uint) fileInfo.Length;
                this.diskStart = (ushort) fileInfo.ArchiveNumber;
            }
        }