private readonly bool ReadOnly;// readonly internal PngMetadata(ChunksList chunks) { chunkList = chunks; if (chunks is ChunksListForWrite) { ReadOnly = false; } else { ReadOnly = true; } }
public string GetHeader(string icon) { string ztxt = string.Empty; PngReader pngr = FileHelper.CreatePngReader(FileName); width = pngr.ImgInfo.Cols; height = pngr.ImgInfo.Rows; ChunksList clist = pngr.GetChunksList(); /*The File should only have one zTxt, this chunk stores our DMI information such as * sprite width, height, iconstates, directionals and frames among other things. */ foreach (PngChunkZTXT desc in clist.GetById("zTXt")) { ztxt = desc.GetVal(); break; } pngr.ShouldCloseStream = true; pngr.End(); return(ztxt); }
/// <summary> /// Constructs a PNGReader objet from a opened Stream /// </summary> /// <remarks>The constructor reads the signature and first chunk (IDHR)<seealso cref="FileHelper.CreatePngReader(string)"/> /// </remarks> /// /// <param name="inputStream"></param> /// <param name="filename">Optional, can be the filename or a description.</param> public PngReader(Stream inputStream, String filename) { this.filename = (filename == null) ? "" : filename; this.inputStream = inputStream; this.chunksList = new ChunksList(null); this.metadata = new PngMetadata(chunksList); this.offset = 0; // set default options this.CurrentChunkGroup = -1; this.ShouldCloseStream = true; this.MaxBytesMetadata = 5 * 1024 * 1024; this.MaxTotalBytesRead = 200 * 1024 * 1024; // 200MB this.SkipChunkMaxSize = 2 * 1024 * 1024; this.SkipChunkIds = new string[] { "fdAT" }; this.ChunkLoadBehaviour = Hjg.Pngcs.Chunks.ChunkLoadBehaviour.LOAD_CHUNK_ALWAYS; // starts reading: signature byte[] pngid = new byte[8]; PngHelperInternal.ReadBytes(inputStream, pngid, 0, pngid.Length); offset += pngid.Length; if (!PngCsUtils.arraysEqual(pngid, PngHelperInternal.PNG_ID_SIGNATURE)) { throw new PngjInputException("Bad PNG signature"); } CurrentChunkGroup = ChunksList.CHUNK_GROUP_0_IDHR; // reads first chunk IDHR int clen = PngHelperInternal.ReadInt4(inputStream); offset += 4; if (clen != 13) { throw new Exception("IDHR chunk len != 13 ?? " + clen); } byte[] chunkid = new byte[4]; PngHelperInternal.ReadBytes(inputStream, chunkid, 0, 4); if (!PngCsUtils.arraysEqual4(chunkid, ChunkHelper.b_IHDR)) { throw new PngjInputException("IHDR not found as first chunk??? [" + ChunkHelper.ToString(chunkid) + "]"); } offset += 4; PngChunkIHDR ihdr = (PngChunkIHDR)ReadChunk(chunkid, clen, false); bool alpha = (ihdr.Colormodel & 0x04) != 0; bool palette = (ihdr.Colormodel & 0x01) != 0; bool grayscale = (ihdr.Colormodel == 0 || ihdr.Colormodel == 4); // creates ImgInfo and imgLine, and allocates buffers ImgInfo = new ImageInfo(ihdr.Cols, ihdr.Rows, ihdr.Bitspc, alpha, grayscale, palette); rowb = new byte[ImgInfo.BytesPerRow + 1]; rowbprev = new byte[rowb.Length]; rowbfilter = new byte[rowb.Length]; interlaced = ihdr.Interlaced == 1; deinterlacer = interlaced ? new PngDeinterlacer(ImgInfo) : null; // some checks if (ihdr.Filmeth != 0 || ihdr.Compmeth != 0 || (ihdr.Interlaced & 0xFFFE) != 0) { throw new PngjInputException("compmethod or filtermethod or interlaced unrecognized"); } if (ihdr.Colormodel < 0 || ihdr.Colormodel > 6 || ihdr.Colormodel == 1 || ihdr.Colormodel == 5) { throw new PngjInputException("Invalid colormodel " + ihdr.Colormodel); } if (ihdr.Bitspc != 1 && ihdr.Bitspc != 2 && ihdr.Bitspc != 4 && ihdr.Bitspc != 8 && ihdr.Bitspc != 16) { throw new PngjInputException("Invalid bit depth " + ihdr.Bitspc); } }
public PngReader(Stream inputStream, string filename) { this.filename = ((filename == null) ? "" : filename); this.inputStream = inputStream; chunksList = new ChunksList(null); metadata = new PngMetadata(chunksList); offset = 0L; CurrentChunkGroup = -1; ShouldCloseStream = true; MaxBytesMetadata = 5242880L; MaxTotalBytesRead = 209715200L; SkipChunkMaxSize = 2097152; SkipChunkIds = new string[1] { "fdAT" }; ChunkLoadBehaviour = ChunkLoadBehaviour.LOAD_CHUNK_ALWAYS; byte[] array = new byte[8]; PngHelperInternal.ReadBytes(inputStream, array, 0, array.Length); offset += array.Length; if (!PngCsUtils.arraysEqual(array, PngHelperInternal.PNG_ID_SIGNATURE)) { throw new PngjInputException("Bad PNG signature"); } CurrentChunkGroup = 0; int num = PngHelperInternal.ReadInt4(inputStream); offset += 4L; if (num != 13) { throw new Exception("IDHR chunk len != 13 ?? " + num.ToString()); } byte[] array2 = new byte[4]; PngHelperInternal.ReadBytes(inputStream, array2, 0, 4); if (!PngCsUtils.arraysEqual4(array2, ChunkHelper.b_IHDR)) { throw new PngjInputException("IHDR not found as first chunk??? [" + ChunkHelper.ToString(array2) + "]"); } offset += 4L; PngChunkIHDR pngChunkIHDR = (PngChunkIHDR)ReadChunk(array2, num, skipforced: false); bool alpha = (pngChunkIHDR.Colormodel & 4) != 0; bool palette = (pngChunkIHDR.Colormodel & 1) != 0; bool grayscale = pngChunkIHDR.Colormodel == 0 || pngChunkIHDR.Colormodel == 4; ImgInfo = new ImageInfo(pngChunkIHDR.Cols, pngChunkIHDR.Rows, pngChunkIHDR.Bitspc, alpha, grayscale, palette); rowb = new byte[ImgInfo.BytesPerRow + 1]; rowbprev = new byte[rowb.Length]; rowbfilter = new byte[rowb.Length]; interlaced = (pngChunkIHDR.Interlaced == 1); deinterlacer = (interlaced ? new PngDeinterlacer(ImgInfo) : null); if (pngChunkIHDR.Filmeth != 0 || pngChunkIHDR.Compmeth != 0 || (pngChunkIHDR.Interlaced & 0xFFFE) != 0) { throw new PngjInputException("compmethod or filtermethod or interlaced unrecognized"); } if (pngChunkIHDR.Colormodel < 0 || pngChunkIHDR.Colormodel > 6 || pngChunkIHDR.Colormodel == 1 || pngChunkIHDR.Colormodel == 5) { throw new PngjInputException("Invalid colormodel " + pngChunkIHDR.Colormodel.ToString()); } if (pngChunkIHDR.Bitspc != 1 && pngChunkIHDR.Bitspc != 2 && pngChunkIHDR.Bitspc != 4 && pngChunkIHDR.Bitspc != 8 && pngChunkIHDR.Bitspc != 16) { throw new PngjInputException("Invalid bit depth " + pngChunkIHDR.Bitspc.ToString()); } }