public unsafe void WriteBigTiffHeader()
{
//IFH
BigTiffImageFileHeader ifh = new BigTiffImageFileHeader();
ifh.ByteOrder = 0x4949;
ifh.Marker = 0x002B;
ifh.OffsetByteSize = 0x0008;
ifh.FirstIFD = 0x00000010;
//第一个IFD，这里只一个
BigTiffImageFileDirectory ifd = new BigTiffImageFileDirectory();
ifd.DECount = 10;
ifd.NextIFD = 0;
int headerLength = sizeof(BigTiffImageFileHeader) + Marshal.SizeOf(ifd.DECount) + BIGTIFF_DE_LENGTH * (int)ifd.DECount + Marshal.SizeOf(ifd.NextIFD); //tiff文件头长度，不包含DE的数据部分，按1个IFD，10个DE计算
int headerDataLength = 0;//DE的数据部分长度,
int headerDataOffset = headerLength;//DE的数据部分偏移量
this._ImageDataOffset = headerLength + headerDataLength;
byte[] headerData = new byte[this._ImageDataOffset];
//IFH
CopyData2Array((byte*)&ifh, sizeof(BigTiffImageFileHeader), headerData, 0);
//IFD
CopyData2Array((byte*)&(ifd.DECount), Marshal.SizeOf(ifd.DECount), headerData, sizeof(BigTiffImageFileHeader));
//DE
#region 开始逐条添加DE
int deLength = BIGTIFF_DE_LENGTH;
int deOffset = sizeof(BigTiffImageFileHeader) + Marshal.SizeOf(ifd.DECount);
fixed (BigTiffDirectoryEntry* deArray = new BigTiffDirectoryEntry[ifd.DECount])
{
int idx = 0;
//图像宽
deArray[idx] = new BigTiffDirectoryEntry { TagID = (ushort)TiffDETag.ImageWidth, DataType = (ushort)TiffDEDataType.LONG, Count = 1L, DataOrPtr = this._width };
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//图像高
idx = 1;
deArray[idx] = new BigTiffDirectoryEntry { TagID = (ushort)TiffDETag.ImageLength, DataType = (ushort)TiffDEDataType.LONG, Count = 1L, DataOrPtr = this._height };
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//颜色深度
idx = 2;
deArray[idx] = new BigTiffDirectoryEntry { TagID = (ushort)TiffDETag.BitsPerSample, DataType = (ushort)TiffDEDataType.SHORT, Count = 3L, DataOrPtr = 0x000800080008 };
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//图片压缩
idx = 3;
deArray[idx] = new BigTiffDirectoryEntry { TagID = (ushort)TiffDETag.Compression, DataType = (ushort)TiffDEDataType.SHORT, Count = 1L, DataOrPtr = 1 };
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//颜色空间
idx = 4;
deArray[idx] = new BigTiffDirectoryEntry { TagID = (ushort)TiffDETag.PhotometricInterpretation, DataType = (ushort)TiffDEDataType.SHORT, Count = 1L, DataOrPtr = 2 };
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//图像扫描线偏移量
idx = 5;
deArray[idx] = new BigTiffDirectoryEntry { TagID = (ushort)TiffDETag.StripOffsets, DataType = (ushort)TiffDEDataType.LONG, Count = 1L, DataOrPtr = (uint)headerData.Length };
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//方向
idx = 6;
deArray[idx] = new BigTiffDirectoryEntry { TagID = (ushort)TiffDETag.Orientation, DataType = (ushort)TiffDEDataType.SHORT, Count = 1L, DataOrPtr = 1 };
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//每像素样本
idx = 7;
deArray[idx] = new BigTiffDirectoryEntry { TagID = (ushort)TiffDETag.SamplesPerPixel, DataType = (ushort)TiffDEDataType.SHORT, Count = 1L, DataOrPtr = 3 };
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//每块行数
idx = 8;
deArray[idx] = new BigTiffDirectoryEntry { TagID = (ushort)TiffDETag.RowsPerStrip, DataType = (ushort)TiffDEDataType.LONG, Count = 1L, DataOrPtr = this._height };
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//每块的字节数
idx = 9;
deArray[idx] = new BigTiffDirectoryEntry { TagID = (ushort)TiffDETag.StripByteCounts, DataType = (ushort)TiffDEDataType.LONG, Count = 1L, DataOrPtr = (ulong)this.ImageDataLength };
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
}
#endregion
_fs.Write(headerData, 0, headerData.Length);
}
public unsafe void WriteBigTiffHeader()
{
//IFH
BigTiffImageFileHeader ifh = new BigTiffImageFileHeader();
ifh.ByteOrder = 0x4949;
ifh.Marker = 0x002B;
ifh.OffsetByteSize = 0x0008;
ifh.FirstIFD = 0x00000010;
//第一个IFD，这里只一个
BigTiffImageFileDirectory ifd = new BigTiffImageFileDirectory();
ifd.DECount = 10;
ifd.NextIFD = 0;
int headerLength = sizeof(BigTiffImageFileHeader) + Marshal.SizeOf(ifd.DECount) + BIGTIFF_DE_LENGTH * (int)ifd.DECount + Marshal.SizeOf(ifd.NextIFD); //tiff文件头长度，不包含DE的数据部分，按1个IFD，10个DE计算
int headerDataLength = 0; //DE的数据部分长度,
int headerDataOffset = headerLength; //DE的数据部分偏移量
this._ImageDataOffset = headerLength + headerDataLength;
byte[] headerData = new byte[this._ImageDataOffset];
//IFH
CopyData2Array((byte *)&ifh, sizeof(BigTiffImageFileHeader), headerData, 0);
//IFD
CopyData2Array((byte *)&(ifd.DECount), Marshal.SizeOf(ifd.DECount), headerData, sizeof(BigTiffImageFileHeader));
//DE
#region 开始逐条添加DE
int deLength = BIGTIFF_DE_LENGTH;
int deOffset = sizeof(BigTiffImageFileHeader) + Marshal.SizeOf(ifd.DECount);
fixed(BigTiffDirectoryEntry *deArray = new BigTiffDirectoryEntry[ifd.DECount])
{
int idx = 0;
//图像宽
deArray[idx] = new BigTiffDirectoryEntry {
TagID = (ushort)TiffDETag.ImageWidth, DataType = (ushort)TiffDEDataType.LONG, Count = 1L, DataOrPtr = this._width
};
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//图像高
idx = 1;
deArray[idx] = new BigTiffDirectoryEntry {
TagID = (ushort)TiffDETag.ImageLength, DataType = (ushort)TiffDEDataType.LONG, Count = 1L, DataOrPtr = this._height
};
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//颜色深度
idx = 2;
deArray[idx] = new BigTiffDirectoryEntry {
TagID = (ushort)TiffDETag.BitsPerSample, DataType = (ushort)TiffDEDataType.SHORT, Count = 3L, DataOrPtr = 0x000800080008
};
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//图片压缩
idx = 3;
deArray[idx] = new BigTiffDirectoryEntry {
TagID = (ushort)TiffDETag.Compression, DataType = (ushort)TiffDEDataType.SHORT, Count = 1L, DataOrPtr = 1
};
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//颜色空间
idx = 4;
deArray[idx] = new BigTiffDirectoryEntry {
TagID = (ushort)TiffDETag.PhotometricInterpretation, DataType = (ushort)TiffDEDataType.SHORT, Count = 1L, DataOrPtr = 2
};
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//图像扫描线偏移量
idx = 5;
deArray[idx] = new BigTiffDirectoryEntry {
TagID = (ushort)TiffDETag.StripOffsets, DataType = (ushort)TiffDEDataType.LONG, Count = 1L, DataOrPtr = (uint)headerData.Length
};
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//方向
idx = 6;
deArray[idx] = new BigTiffDirectoryEntry {
TagID = (ushort)TiffDETag.Orientation, DataType = (ushort)TiffDEDataType.SHORT, Count = 1L, DataOrPtr = 1
};
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//每像素样本
idx = 7;
deArray[idx] = new BigTiffDirectoryEntry {
TagID = (ushort)TiffDETag.SamplesPerPixel, DataType = (ushort)TiffDEDataType.SHORT, Count = 1L, DataOrPtr = 3
};
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//每块行数
idx = 8;
deArray[idx] = new BigTiffDirectoryEntry {
TagID = (ushort)TiffDETag.RowsPerStrip, DataType = (ushort)TiffDEDataType.LONG, Count = 1L, DataOrPtr = this._height
};
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
//每块的字节数
idx = 9;
deArray[idx] = new BigTiffDirectoryEntry {
TagID = (ushort)TiffDETag.StripByteCounts, DataType = (ushort)TiffDEDataType.LONG, Count = 1L, DataOrPtr = (ulong)this.ImageDataLength
};
CopyData2Array(deArray[idx], deLength, headerData, deOffset + idx * deLength);
}
#endregion
_fs.Write(headerData, 0, headerData.Length);
}
