/* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % RRRR L AAA % % R R L A A % % RRRR L AAAAA % % R R L A A % % R R LLLLL A A % % % % % % Read Alias/Wavefront Image Format % % % % Software Design % % Cristy % % July 1992 % % % % % % Copyright 1999-2021 ImageMagick Studio LLC, a non-profit organization % % dedicated to making software imaging solutions freely available. % % % % You may not use this file except in compliance with the License. You may % % obtain a copy of the License at % % % % https://imagemagick.org/script/license.php % % % % Unless required by applicable law or agreed to in writing, software % % distributed under the License is distributed on an "AS IS" BASIS, % % WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. % % See the License for the specific language governing permissions and % % limitations under the License. % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % */ /* Include declarations. */ #include "MagickCore/studio.h" #include "MagickCore/property.h" #include "MagickCore/blob.h" #include "MagickCore/blob-private.h" #include "MagickCore/cache.h" #include "MagickCore/exception.h" #include "MagickCore/exception-private.h" #include "MagickCore/image.h" #include "MagickCore/image-private.h" #include "MagickCore/list.h" #include "MagickCore/magick.h" #include "MagickCore/memory_.h" #include "MagickCore/monitor.h" #include "MagickCore/monitor-private.h" #include "MagickCore/pixel-accessor.h" #include "MagickCore/quantum-private.h" #include "MagickCore/static.h" #include "MagickCore/string_.h" #include "MagickCore/module.h" /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % R e a d R L A I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % ReadRLAImage() reads a run-length encoded Wavefront RLA image file % and returns it. It allocates the memory necessary for the new Image % structure and returns a pointer to the new image. % % Note: This module was contributed by Lester Vecsey (master@internexus.net). % % The format of the ReadRLAImage method is: % % Image *ReadRLAImage(const ImageInfo *image_info,ExceptionInfo *exception) % % A description of each parameter follows: % % o image_info: the image info. % % o exception: return any errors or warnings in this structure. % */ static Image *ReadRLAImage(const ImageInfo *image_info,ExceptionInfo *exception) { typedef struct _WindowFrame { short left, right, bottom, top; } WindowFrame; typedef struct _RLAInfo { WindowFrame window, active_window; short frame, storage_type, number_channels, number_matte_channels, number_auxiliary_channels, revision; char gamma[16+1], red_primary[24+1], green_primary[24+1], blue_primary[24+1], white_point[24+1]; int job_number; char name[128+1], description[128+1], program[64+1], machine[32+1], user[32+1], date[20+1], aspect[24+1], aspect_ratio[8+1], chan[32+1]; short field; char time[12], filter[32]; short bits_per_channel, matte_type, matte_bits, auxiliary_type, auxiliary_bits; char auxiliary[32+1], space[36+1]; int next; } RLAInfo; Image *image; int channel, length, runlength; MagickBooleanType status; MagickOffsetType offset, *scanlines; ssize_t i, x; Quantum *q; ssize_t count, y; RLAInfo rla_info; unsigned char byte; /* Open image file. */ assert(image_info != (const ImageInfo *) NULL); assert(image_info->signature == MagickCoreSignature); if (image_info->debug != MagickFalse) (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s", image_info->filename); assert(exception != (ExceptionInfo *) NULL); assert(exception->signature == MagickCoreSignature); image=AcquireImage(image_info,exception); status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception); if (status == MagickFalse) { image=DestroyImageList(image); return((Image *) NULL); } (void) memset(&rla_info,0,sizeof(rla_info)); rla_info.window.left=(short) ReadBlobMSBShort(image); rla_info.window.right=(short) ReadBlobMSBShort(image); rla_info.window.bottom=(short) ReadBlobMSBShort(image); rla_info.window.top=(short) ReadBlobMSBShort(image); rla_info.active_window.left=(short) ReadBlobMSBShort(image); rla_info.active_window.right=(short) ReadBlobMSBShort(image); rla_info.active_window.bottom=(short) ReadBlobMSBShort(image); rla_info.active_window.top=(short) ReadBlobMSBShort(image); rla_info.frame=(short) ReadBlobMSBShort(image); rla_info.storage_type=(short) ReadBlobMSBShort(image); rla_info.number_channels=(short) ReadBlobMSBShort(image); if (rla_info.number_channels < 0) ThrowReaderException(CorruptImageError,"ImproperImageHeader"); rla_info.number_matte_channels=(short) ReadBlobMSBShort(image); if (rla_info.number_matte_channels < 0) ThrowReaderException(CorruptImageError,"ImproperImageHeader"); if ((rla_info.number_channels > 3) || (rla_info.number_matte_channels > 3)) ThrowReaderException(CoderError,"Unsupported number of channels"); if (rla_info.number_channels == 0) rla_info.number_channels=3; rla_info.number_channels+=rla_info.number_matte_channels; rla_info.number_auxiliary_channels=(short) ReadBlobMSBShort(image); rla_info.revision=(short) ReadBlobMSBShort(image); (void) ReadBlob(image,16,(unsigned char *) rla_info.gamma); (void) ReadBlob(image,24,(unsigned char *) rla_info.red_primary); (void) ReadBlob(image,24,(unsigned char *) rla_info.green_primary); (void) ReadBlob(image,24,(unsigned char *) rla_info.blue_primary); (void) ReadBlob(image,24,(unsigned char *) rla_info.white_point); rla_info.job_number=ReadBlobMSBSignedLong(image); (void) ReadBlob(image,128,(unsigned char *) rla_info.name); (void) ReadBlob(image,128,(unsigned char *) rla_info.description); rla_info.description[127]='\0'; (void) ReadBlob(image,64,(unsigned char *) rla_info.program); (void) ReadBlob(image,32,(unsigned char *) rla_info.machine); (void) ReadBlob(image,32,(unsigned char *) rla_info.user); (void) ReadBlob(image,20,(unsigned char *) rla_info.date); (void) ReadBlob(image,24,(unsigned char *) rla_info.aspect); (void) ReadBlob(image,8,(unsigned char *) rla_info.aspect_ratio); (void) ReadBlob(image,32,(unsigned char *) rla_info.chan); rla_info.field=(short) ReadBlobMSBShort(image); (void) ReadBlob(image,12,(unsigned char *) rla_info.time); (void) ReadBlob(image,32,(unsigned char *) rla_info.filter); rla_info.bits_per_channel=(short) ReadBlobMSBShort(image); rla_info.matte_type=(short) ReadBlobMSBShort(image); rla_info.matte_bits=(short) ReadBlobMSBShort(image); rla_info.auxiliary_type=(short) ReadBlobMSBShort(image); rla_info.auxiliary_bits=(short) ReadBlobMSBShort(image); (void) ReadBlob(image,32,(unsigned char *) rla_info.auxiliary); count=ReadBlob(image,36,(unsigned char *) rla_info.space); if ((size_t) count != 36) ThrowReaderException(CorruptImageError,"UnableToReadImageData"); rla_info.next=ReadBlobMSBSignedLong(image); /* Initialize image structure. */ image->alpha_trait=rla_info.number_matte_channels != 0 ? BlendPixelTrait : UndefinedPixelTrait; image->columns=(size_t) (rla_info.active_window.right- rla_info.active_window.left+1); image->rows=(size_t) (rla_info.active_window.top- rla_info.active_window.bottom+1); if (image_info->ping != MagickFalse) { (void) CloseBlob(image); return(GetFirstImageInList(image)); } status=SetImageExtent(image,image->columns,image->rows,exception); if (status == MagickFalse) return(DestroyImageList(image)); scanlines=(MagickOffsetType *) AcquireQuantumMemory(image->rows, sizeof(*scanlines)); if (scanlines == (MagickOffsetType *) NULL) ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed"); if (*rla_info.description != '\0') (void) SetImageProperty(image,"comment",rla_info.description,exception); /* Read offsets to each scanline data. */ for (i=0; i < (ssize_t) image->rows; i++) scanlines[i]=(MagickOffsetType) ReadBlobMSBSignedLong(image); if (EOFBlob(image) != MagickFalse) { scanlines=(MagickOffsetType *) RelinquishMagickMemory(scanlines); ThrowReaderException(CorruptImageError,"ImproperImageHeader"); } /* Read image data. */ for (y=0; y < (ssize_t) image->rows; y++) { offset=SeekBlob(image,scanlines[image->rows-y-1],SEEK_SET); if (offset < 0) { scanlines=(MagickOffsetType *) RelinquishMagickMemory(scanlines); ThrowReaderException(CorruptImageError,"ImproperImageHeader"); } x=0; for (channel=0; channel < (int) rla_info.number_channels; channel++) { length=ReadBlobMSBSignedShort(image); while (length > 0) { byte=(unsigned char) ReadBlobByte(image); runlength=byte; if (byte > 127) runlength=byte-256; length--; if (length == 0) break; if (runlength < 0) { while (runlength < 0) { q=GetAuthenticPixels(image,(ssize_t) (x % image->columns),y,1,1, exception); if (q == (Quantum *) NULL) break; byte=(unsigned char) ReadBlobByte(image); length--; switch (channel) { case 0: { SetPixelRed(image,ScaleCharToQuantum(byte),q); break; } case 1: { SetPixelGreen(image,ScaleCharToQuantum(byte),q); break; } case 2: { SetPixelBlue(image,ScaleCharToQuantum(byte),q); break; } case 3: default: { SetPixelAlpha(image,ScaleCharToQuantum(byte),q); break; } } if (SyncAuthenticPixels(image,exception) == MagickFalse) break; x++; runlength++; } continue; } byte=(unsigned char) ReadBlobByte(image); length--; runlength++; do { q=GetAuthenticPixels(image,(ssize_t) (x % image->columns),y,1,1, exception); if (q == (Quantum *) NULL) break; switch (channel) { case 0: { SetPixelRed(image,ScaleCharToQuantum(byte),q); break; } case 1: { SetPixelGreen(image,ScaleCharToQuantum(byte),q); break; } case 2: { SetPixelBlue(image,ScaleCharToQuantum(byte),q); break; } case 3: default: { SetPixelAlpha(image,ScaleCharToQuantum(byte),q); break; } } if (SyncAuthenticPixels(image,exception) == MagickFalse) break; x++; runlength--; } while (runlength > 0); } } if ((x/(ssize_t) rla_info.number_channels) > (ssize_t) image->columns) { scanlines=(MagickOffsetType *) RelinquishMagickMemory(scanlines); ThrowReaderException(CorruptImageError,"CorruptImage"); } if (EOFBlob(image) != MagickFalse) break; status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y, image->rows); if (status == MagickFalse) break; } scanlines=(MagickOffsetType *) RelinquishMagickMemory(scanlines); if (EOFBlob(image) != MagickFalse) ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile", image->filename); (void) CloseBlob(image); return(GetFirstImageInList(image)); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % R e g i s t e r R L A I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % RegisterRLAImage() adds attributes for the RLA image format to % the list of supported formats. The attributes include the image format % tag, a method to read and/or write the format, whether the format % supports the saving of more than one frame to the same file or blob, % whether the format supports native in-memory I/O, and a brief % description of the format. % % The format of the RegisterRLAImage method is: % % size_t RegisterRLAImage(void) % */ ModuleExport size_t RegisterRLAImage(void) { MagickInfo *entry; entry=AcquireMagickInfo("RLA","RLA","Alias/Wavefront image"); entry->decoder=(DecodeImageHandler *) ReadRLAImage; entry->flags^=CoderAdjoinFlag; entry->flags|=CoderDecoderSeekableStreamFlag; (void) RegisterMagickInfo(entry); return(MagickImageCoderSignature); } /* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % % % % % % U n r e g i s t e r R L A I m a g e % % % % % % % %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % % UnregisterRLAImage() removes format registrations made by the % RLA module from the list of supported formats. % % The format of the UnregisterRLAImage method is: % % UnregisterRLAImage(void) % */ ModuleExport void UnregisterRLAImage(void) { (void) UnregisterMagickInfo("RLA"); }