| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % DDDD J V V U U % |
| % D D J V V U U % |
| % D D J V V U U % |
| % D D J J V V U U % |
| % DDDD JJJ V UUU % |
| % % |
| % % |
| % Read DjVu Images. % |
| % % |
| % Software Design % |
| % Cristy % |
| % July 1992 % |
| % % |
| % % |
| % Copyright 1999-2020 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/blob.h" |
| #include "MagickCore/blob-private.h" |
| #include "MagickCore/cache.h" |
| #include "MagickCore/colormap.h" |
| #include "MagickCore/constitute.h" |
| #include "MagickCore/exception.h" |
| #include "MagickCore/exception-private.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" |
| #if defined(MAGICKCORE_DJVU_DELEGATE) |
| #include <libdjvu/ddjvuapi.h> |
| #endif |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % I s D J V U % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % IsDJVU() returns MagickTrue if the image format type, identified by the |
| % magick string, is DJVU. |
| % |
| % The format of the IsDJVU method is: |
| % |
| % MagickBooleanType IsDJVU(const unsigned char *magick,const size_t length) |
| % |
| % A description of each parameter follows: |
| % |
| % o magick: compare image format pattern against these bytes. |
| % |
| % o length: Specifies the length of the magick string. |
| % |
| */ |
| static MagickBooleanType IsDJVU(const unsigned char *magick,const size_t length) |
| { |
| if (length < 8) |
| return(MagickFalse); |
| if (memcmp(magick,"AT&TFORM",8) == 0) |
| return(MagickTrue); |
| return(MagickFalse); |
| } |
| |
| #if defined(MAGICKCORE_DJVU_DELEGATE) |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % R e a d D J V U I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % ReadDJVUImage() reads DJVU image and returns it. It allocates the memory |
| % necessary for the new Image structure and returns a pointer to the new |
| % image or set of images. |
| % |
| % The format of the ReadDJVUImage method is: |
| % |
| % Image *ReadDJVUImage(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. |
| % |
| */ |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| extern "C" { |
| #endif |
| |
| typedef struct _LoadContext |
| LoadContext; |
| |
| struct _LoadContext |
| { |
| ddjvu_context_t* context; |
| ddjvu_document_t *document; |
| ddjvu_page_t *page; |
| int streamid; |
| int pages; |
| Image *image; |
| }; |
| |
| #define BLOCKSIZE 65536 |
| #if 0 |
| static void |
| pump_data(Image *image, LoadContext* lc) |
| { |
| int blocksize = BLOCKSIZE; |
| char data[BLOCKSIZE]; |
| int size; |
| |
| /* i might check for a condition! */ |
| while ((size = (size_t) ReadBlob(image,(size_t) blocksize,data)) == blocksize) { |
| ddjvu_stream_write(lc->document, lc->streamid, data, size); |
| } |
| if (size) |
| ddjvu_stream_write(lc->document, lc->streamid, data, size); |
| ddjvu_stream_close(lc->document, lc->streamid, 0); |
| } |
| #endif |
| |
| /* returns NULL only after all is delivered! */ |
| static ddjvu_message_t* |
| pump_data_until_message(LoadContext *lc,Image *image) /* ddjvu_context_t *context, type ddjvu_document_type_t */ |
| { |
| size_t blocksize = BLOCKSIZE; |
| unsigned char data[BLOCKSIZE]; |
| size_t size; |
| ddjvu_message_t *message; |
| |
| /* i might check for a condition! */ |
| size=0; |
| while (!(message = ddjvu_message_peek(lc->context)) |
| && (size = (size_t) ReadBlob(image,(size_t) blocksize,data)) == blocksize) { |
| ddjvu_stream_write(lc->document, lc->streamid, (char *) data, size); |
| } |
| if (message) |
| return message; |
| if (size) |
| ddjvu_stream_write(lc->document, lc->streamid, (char *) data, size); |
| ddjvu_stream_close(lc->document, lc->streamid, 0); |
| return NULL; |
| } |
| #define DEBUG 0 |
| |
| #if DEBUG |
| static const char *message_tag_name(ddjvu_message_tag_t tag) |
| { |
| static char* names[] = |
| { |
| "ERROR", |
| "INFO", |
| "NEWSTREAM", |
| "DOCINFO", |
| "PAGEINFO", |
| "RELAYOUT", |
| "REDISPLAY", |
| "CHUNK", |
| "THUMBNAIL", |
| "PROGRESS", |
| }; |
| if (tag <= DDJVU_PROGRESS) |
| return names[tag]; |
| else { |
| /* bark! */ |
| return 0; |
| } |
| } |
| #endif |
| |
| /* write out nice info on the message, |
| * and store in *user* data the info on progress. |
| * */ |
| int |
| process_message(ddjvu_message_t *message) |
| { |
| |
| #if 0 |
| ddjvu_context_t* context= message->m_any.context; |
| #endif |
| |
| if (! message) |
| return(-1); |
| #if DEBUG |
| printf("*** %s: %s.\n",__FUNCTION__, message_tag_name(message->m_any.tag)); |
| #endif |
| |
| |
| switch (message->m_any.tag){ |
| case DDJVU_DOCINFO: |
| { |
| ddjvu_document_t* document= message->m_any.document; |
| /* ddjvu_document_decoding_status is set by libdjvu! */ |
| /* we have some info on the document */ |
| LoadContext *lc = (LoadContext *) ddjvu_document_get_user_data(document); |
| lc->pages = ddjvu_document_get_pagenum(document); |
| #if DEBUG |
| printf("the doc has %d pages\n", ddjvu_document_get_pagenum(document)); |
| #endif |
| break; |
| } |
| case DDJVU_CHUNK: |
| #if DEBUG |
| printf("the name of the chunk is: %s\n", message->m_chunk.chunkid); |
| #endif |
| break; |
| |
| |
| case DDJVU_RELAYOUT: |
| case DDJVU_PAGEINFO: |
| { |
| #if 0 |
| ddjvu_page_t* page = message->m_any.page; |
| page_info* info = ddjvu_page_get_user_data(page); |
| |
| printf("page decoding status: %d %s%s%s\n", |
| ddjvu_page_decoding_status(page), |
| status_color, status_name(ddjvu_page_decoding_status(page)), color_reset); |
| |
| printf("the page LAYOUT changed: width x height: %d x %d @ %d dpi. Version %d, type %d\n", |
| // printf("page info:\n width x height: %d x %d @ %d dpi, version %d, type %d\n", |
| ddjvu_page_get_width(page), |
| ddjvu_page_get_height(page), |
| ddjvu_page_get_resolution(page), |
| ddjvu_page_get_version(page), |
| /* DDJVU_PAGETYPE_BITONAL */ |
| ddjvu_page_get_type(page)); |
| |
| info->info = 1; |
| #endif |
| break; |
| } |
| |
| case DDJVU_REDISPLAY: |
| { |
| |
| #if 0 |
| ddjvu_page_t* page = message->m_any.page; |
| page_info* info = ddjvu_page_get_user_data(page); |
| |
| printf("the page can/should be REDISPLAYED\n"); |
| info->display = 1; |
| #endif |
| break; |
| } |
| |
| case DDJVU_PROGRESS: |
| #if DEBUG |
| printf("PROGRESS:\n"); |
| #endif |
| break; |
| case DDJVU_ERROR: |
| printf("simply ERROR!\n message:\t%s\nfunction:\t%s(file %s)\nlineno:\t%d\n", |
| message->m_error.message, |
| message->m_error.function, |
| message->m_error.filename, |
| message->m_error.lineno); |
| break; |
| case DDJVU_INFO: |
| #if DEBUG |
| printf("INFO: %s!\n", message->m_info.message); |
| #endif |
| break; |
| default: |
| printf("unexpected\n"); |
| }; |
| return(message->m_any.tag); |
| } |
| |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| } |
| #endif |
| |
| |
| #define RGB 1 |
| |
| /* |
| * DjVu advertised readiness to provide bitmap: So get it! |
| * we use the RGB format! |
| */ |
| static void |
| get_page_image(LoadContext *lc, ddjvu_page_t *page, int x, int y, int w, int h, ExceptionInfo *exception ) { |
| ddjvu_format_t |
| *format; |
| |
| ddjvu_page_type_t |
| type; |
| |
| Image |
| *image; |
| |
| int |
| ret, |
| stride; |
| |
| unsigned char |
| *q; |
| |
| ddjvu_rect_t rect; |
| rect.x = x; |
| rect.y = y; |
| rect.w = (unsigned int) w; /* /10 */ |
| rect.h = (unsigned int) h; /* /10 */ |
| |
| image = lc->image; |
| type = ddjvu_page_get_type(lc->page); |
| |
| /* stride of this temporary buffer: */ |
| stride = (type == DDJVU_PAGETYPE_BITONAL)? |
| (image->columns + 7)/8 : image->columns *3; |
| |
| q = (unsigned char *) AcquireQuantumMemory(image->rows,stride); |
| if (q == (unsigned char *) NULL) |
| return; |
| |
| format = ddjvu_format_create( |
| (type == DDJVU_PAGETYPE_BITONAL)?DDJVU_FORMAT_LSBTOMSB : DDJVU_FORMAT_RGB24, |
| /* DDJVU_FORMAT_RGB24 |
| * DDJVU_FORMAT_RGBMASK32*/ |
| /* DDJVU_FORMAT_RGBMASK32 */ |
| 0, NULL); |
| |
| #if 0 |
| /* fixme: ThrowReaderException is a macro, which uses `exception' variable */ |
| if (format == NULL) |
| { |
| abort(); |
| /* ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed"); */ |
| } |
| |
| #endif |
| ddjvu_format_set_row_order(format, 1); |
| ddjvu_format_set_y_direction(format, 1); |
| |
| ret = ddjvu_page_render(page, |
| DDJVU_RENDER_COLOR, /* ddjvu_render_mode_t */ |
| &rect, |
| &rect, /* mmc: ?? */ |
| format, |
| stride, /* ?? */ |
| (char*)q); |
| (void) ret; |
| ddjvu_format_release(format); |
| |
| |
| if (type == DDJVU_PAGETYPE_BITONAL) { |
| /* */ |
| #if DEBUG |
| printf("%s: expanding BITONAL page/image\n", __FUNCTION__); |
| #endif |
| size_t bit, byte; |
| |
| for (y=0; y < (ssize_t) image->rows; y++) |
| { |
| Quantum * o = QueueAuthenticPixels(image,0,y,image->columns,1,exception); |
| if (o == (Quantum *) NULL) |
| break; |
| bit=0; |
| byte=0; |
| |
| /* fixme: the non-aligned, last =<7 bits ! that's ok!!!*/ |
| for (x= 0; x < (ssize_t) image->columns; x++) |
| { |
| if (bit == 0) byte= (size_t) q[(y * stride) + (x / 8)]; |
| |
| SetPixelIndex(image,(Quantum) (((byte & 0x01) != 0) ? 0x00 : 0x01),o); |
| bit++; |
| if (bit == 8) |
| bit=0; |
| byte>>=1; |
| o+=GetPixelChannels(image); |
| } |
| if (SyncAuthenticPixels(image,exception) == MagickFalse) |
| break; |
| } |
| if (!image->ping) |
| SyncImage(image,exception); |
| } else { |
| #if DEBUG |
| printf("%s: expanding PHOTO page/image\n", __FUNCTION__); |
| #endif |
| /* now transfer line-wise: */ |
| ssize_t i; |
| #if 0 |
| /* old: */ |
| char* r; |
| #else |
| register Quantum *r; |
| unsigned char *s; |
| #endif |
| s=q; |
| for (i = 0;i< (ssize_t) image->rows; i++) |
| { |
| #if DEBUG |
| if (i % 1000 == 0) printf("%d\n",i); |
| #endif |
| r = QueueAuthenticPixels(image,0,i,image->columns,1,exception); |
| if (r == (Quantum *) NULL) |
| break; |
| for (x=0; x < (ssize_t) image->columns; x++) |
| { |
| SetPixelRed(image,ScaleCharToQuantum(*s++),r); |
| SetPixelGreen(image,ScaleCharToQuantum(*s++),r); |
| SetPixelBlue(image,ScaleCharToQuantum(*s++),r); |
| r+=GetPixelChannels(image); |
| } |
| |
| (void) SyncAuthenticPixels(image,exception); |
| } |
| } |
| q=(unsigned char *) RelinquishMagickMemory(q); |
| } |
| |
| |
| #if defined(MAGICKCORE_DJVU_DELEGATE) |
| |
| #if 0 |
| static int |
| get_page_line(LoadContext *lc, int row, QuantumInfo* quantum_info) |
| { |
| ddjvu_format_t |
| *format; |
| |
| int |
| ret; |
| |
| size_t |
| stride; |
| |
| unsigned char |
| *q; |
| |
| ddjvu_rect_t rect, pagerect; |
| rect.x = 0; |
| rect.y = row; |
| rect.w = lc->image->columns; /* /10 */ |
| rect.h = 1; /* /10 */ |
| |
| pagerect.x = 0; |
| pagerect.y = 0; |
| pagerect.w = lc->image->columns; |
| pagerect.h = lc->image->rows; |
| |
| |
| format = ddjvu_format_create( |
| #if RGB |
| DDJVU_FORMAT_RGB24 |
| #else |
| DDJVU_FORMAT_GREY8 |
| #endif |
| , |
| 0, NULL); |
| ddjvu_format_set_row_order(format, 1); |
| ddjvu_format_set_y_direction(format, 1); |
| |
| stride=1; |
| #if RGB |
| stride=3; |
| #endif |
| q = (unsigned char *) AcquireQuantumMemory(lc->image->columns,stride); |
| |
| ret = ddjvu_page_render(lc->page, |
| DDJVU_RENDER_COLOR, /* ddjvu_render_mode_t */ |
| &pagerect, |
| &rect, /* mmc: ?? */ |
| format, |
| pagerect.w * 3, /* ?? */ |
| (char*)q); |
| |
| ImportQuantumPixels(lc->image, |
| (CacheView *) NULL, |
| quantum_info, |
| #if RGB |
| RGBQuantum |
| #else |
| GrayQuantum |
| #endif |
| ,q,&lc->image->exception); |
| q=(unsigned char *) RelinquishMagickMemory(q); |
| ddjvu_format_release(format); |
| return ret; |
| } |
| #endif |
| #endif |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % R e a d O n e D J V U I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % ReadOneDJVUImage() reads a Portable Network Graphics (DJVU) image file |
| % (minus the 8-byte signature) and returns it. It allocates the memory |
| % necessary for the new Image structure and returns a pointer to the new |
| % image. |
| % |
| % The format of the ReadOneDJVUImage method is: |
| % |
| % Image *ReadOneDJVUImage(MngInfo *mng_info, const ImageInfo *image_info, |
| % ExceptionInfo *exception) |
| % |
| % A description of each parameter follows: |
| % |
| % o mng_info: Specifies a pointer to a MngInfo structure. |
| % |
| % o image_info: the image info. |
| % |
| % o exception: return any errors or warnings in this structure. |
| % |
| */ |
| |
| static Image *ReadOneDJVUImage(LoadContext* lc,const int pagenum, |
| const ImageInfo *image_info,ExceptionInfo *exception) |
| { |
| ddjvu_page_type_t |
| type; |
| |
| ddjvu_pageinfo_t info; |
| ddjvu_message_t *message; |
| Image *image; |
| int logging; |
| int tag; |
| MagickBooleanType status; |
| |
| /* so, we know that the page is there! Get its dimension, and */ |
| |
| /* Read one DJVU image */ |
| image = lc->image; |
| |
| /* register Quantum *q; */ |
| |
| logging=LogMagickEvent(CoderEvent,GetMagickModule(), " enter ReadOneDJVUImage()"); |
| (void) logging; |
| |
| #if DEBUG |
| printf("==== Loading the page %d\n", pagenum); |
| #endif |
| lc->page = ddjvu_page_create_by_pageno(lc->document, pagenum); /* 0? */ |
| |
| /* pump data untill the page is ready for rendering. */ |
| tag=(-1); |
| do { |
| while ((message = ddjvu_message_peek(lc->context))) |
| { |
| tag=process_message(message); |
| if (tag == 0) break; |
| ddjvu_message_pop(lc->context); |
| } |
| /* fixme: maybe exit? */ |
| /* if (lc->error) break; */ |
| |
| message = pump_data_until_message(lc,image); |
| if (message) |
| do { |
| tag=process_message(message); |
| if (tag == 0) break; |
| ddjvu_message_pop(lc->context); |
| } while ((message = ddjvu_message_peek(lc->context))); |
| if (tag == 0) break; |
| } while (!ddjvu_page_decoding_done(lc->page)); |
| |
| ddjvu_document_get_pageinfo(lc->document, pagenum, &info); |
| |
| image->resolution.x = (float) info.dpi; |
| image->resolution.y =(float) info.dpi; |
| if (image_info->density != (char *) NULL) |
| { |
| int |
| flags; |
| |
| GeometryInfo |
| geometry_info; |
| |
| /* |
| Set rendering resolution. |
| */ |
| flags=ParseGeometry(image_info->density,&geometry_info); |
| image->resolution.x=geometry_info.rho; |
| image->resolution.y=geometry_info.sigma; |
| if ((flags & SigmaValue) == 0) |
| image->resolution.y=image->resolution.x; |
| info.width*=image->resolution.x/info.dpi; |
| info.height*=image->resolution.y/info.dpi; |
| info.dpi=(ssize_t) MagickMax(image->resolution.x,image->resolution.y); |
| } |
| type = ddjvu_page_get_type(lc->page); |
| |
| /* double -> float! */ |
| /* image->gamma = (float)ddjvu_page_get_gamma(lc->page); */ |
| |
| /* mmc: set image->depth */ |
| /* mmc: This from the type */ |
| |
| image->columns=(size_t) info.width; |
| image->rows=(size_t) info.height; |
| |
| /* mmc: bitonal should be palettized, and compressed! */ |
| if (type == DDJVU_PAGETYPE_BITONAL){ |
| image->colorspace = GRAYColorspace; |
| image->storage_class = PseudoClass; |
| image->depth = 8UL; /* i only support that? */ |
| image->colors= 2; |
| if (AcquireImageColormap(image,image->colors,exception) == MagickFalse) |
| ThrowReaderException(ResourceLimitError, |
| "MemoryAllocationFailed"); |
| } else { |
| image->colorspace = RGBColorspace; |
| image->storage_class = DirectClass; |
| /* fixme: MAGICKCORE_QUANTUM_DEPTH ?*/ |
| image->depth = 8UL; /* i only support that? */ |
| |
| image->alpha_trait = BlendPixelTrait; |
| /* is this useful? */ |
| } |
| status=SetImageExtent(image,image->columns,image->rows,exception); |
| if (status == MagickFalse) |
| return(DestroyImageList(image)); |
| #if DEBUG |
| printf("now filling %.20g x %.20g\n",(double) image->columns,(double) |
| image->rows); |
| #endif |
| |
| |
| #if 1 /* per_line */ |
| |
| /* q = QueueAuthenticPixels(image,0,0,image->columns,image->rows); */ |
| get_page_image(lc, lc->page, 0, 0, info.width, info.height, exception); |
| #else |
| int i; |
| for (i = 0;i< image->rows; i++) |
| { |
| printf("%d\n",i); |
| q = QueueAuthenticPixels(image,0,i,image->columns,1); |
| get_page_line(lc, i, quantum_info); |
| SyncAuthenticPixels(image); |
| } |
| |
| #endif /* per_line */ |
| |
| |
| #if DEBUG |
| printf("END: finished filling %.20g x %.20g\n",(double) image->columns, |
| (double) image->rows); |
| #endif |
| |
| if (!image->ping) |
| SyncImage(image,exception); |
| /* mmc: ??? Convert PNM pixels to runlength-encoded MIFF packets. */ |
| /* image->colors = */ |
| |
| /* how is the line padding / stride? */ |
| |
| if (lc->page) { |
| ddjvu_page_release(lc->page); |
| lc->page = NULL; |
| } |
| |
| /* image->page.y=mng_info->y_off[mng_info->object_id]; */ |
| if (tag == 0) |
| image=DestroyImage(image); |
| return image; |
| /* end of reading one DJVU page/image */ |
| } |
| |
| #if 0 |
| /* palette */ |
| if (AcquireImageColormap(image,2,exception) == MagickFalse) |
| ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed"); |
| /* |
| Monochrome colormap. mmc: this the default! |
| */ |
| image->colormap[0].red=QuantumRange; |
| image->colormap[0].green=QuantumRange; |
| image->colormap[0].blue=QuantumRange; |
| image->colormap[1].red=0; |
| image->colormap[1].green=0; |
| image->colormap[1].blue=0; |
| #endif |
| |
| static void djvu_close_lc(LoadContext* lc) |
| { |
| if (lc->document) |
| ddjvu_document_release(lc->document); |
| if (lc->context) |
| ddjvu_context_release(lc->context); |
| if (lc->page) |
| ddjvu_page_release(lc->page); |
| RelinquishMagickMemory(lc); |
| } |
| |
| static Image *ReadDJVUImage(const ImageInfo *image_info, |
| ExceptionInfo *exception) |
| { |
| const char |
| *url; |
| |
| ddjvu_message_t |
| *message; |
| |
| Image |
| *image, |
| *images; |
| |
| int |
| logging, |
| use_cache; |
| |
| LoadContext |
| *lc; |
| |
| MagickBooleanType |
| status; |
| |
| register ssize_t |
| i; |
| |
| /* |
| * 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); |
| |
| |
| logging = LogMagickEvent(CoderEvent,GetMagickModule(),"enter ReadDJVUImage()"); |
| (void) logging; |
| |
| image = AcquireImage(image_info,exception); /* mmc: ?? */ |
| |
| |
| lc = (LoadContext *) NULL; |
| status = OpenBlob(image_info,image,ReadBinaryBlobMode,exception); |
| if (status == MagickFalse) |
| ThrowReaderException(FileOpenError,"UnableToOpenFile"); |
| /* |
| Verify DJVU signature. |
| */ |
| #if 0 |
| count = ReadBlob(image,8,(unsigned char *) magic_number); |
| |
| /* IsDJVU(const unsigned char *magick,const size_t length) */ |
| if (memcmp(magic_number,"AT&TFORM",8) != 0) |
| ThrowReaderException(CorruptImageError,"ImproperImageHeader"); |
| #endif |
| |
| |
| /* |
| * Allocate a LoadContext structure. |
| */ |
| lc = (LoadContext *) AcquireMagickMemory(sizeof(*lc)); |
| if (lc == NULL) |
| ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed"); |
| |
| |
| /* |
| * Initialize members of the MngInfo structure. |
| */ |
| (void) memset(lc,0,sizeof(LoadContext)); |
| |
| lc->image = image; |
| lc->pages = 0; |
| lc->context = ddjvu_context_create("ImageMagick djvu loader"); /* g_program_name */ |
| |
| ddjvu_cache_set_size(lc->context, 1); /* right? */ |
| use_cache = 0; |
| /* document: here we don't have a filename, but, for the sake of generality, a FILE* ! */ |
| url="https://imagemagick.org/fake.djvu"; |
| lc->document = ddjvu_document_create(lc->context, url, use_cache); /* don't cache */ |
| ddjvu_document_set_user_data(lc->document, lc); |
| |
| |
| /* now we wait the message-request for data: */ |
| message = ddjvu_message_wait(lc->context); |
| |
| if (message->m_any.tag != DDJVU_NEWSTREAM) { |
| /* fixme: the djvu context, document! */ |
| |
| ddjvu_document_release(lc->document); |
| ddjvu_context_release(lc->context); |
| |
| RelinquishMagickMemory(lc); |
| |
| ThrowReaderException(ResourceLimitError,"Djvu initial message: unexpected type"); |
| return NULL; /* error! */ |
| }; |
| |
| lc->streamid = message->m_newstream.streamid; |
| ddjvu_message_pop(lc->context); |
| |
| message = pump_data_until_message(lc,image); |
| /* now process the messages: */ |
| |
| |
| if (message) do { |
| process_message(message); |
| ddjvu_message_pop(lc->context); |
| } while ((message = ddjvu_message_peek(lc->context))); |
| |
| /* fixme: i hope we have not read any messages pertinent(?) related to the page itself! */ |
| |
| while (lc->pages == 0) { |
| message = ddjvu_message_wait(lc->context); |
| process_message(message); |
| ddjvu_message_pop(lc->context); |
| } |
| |
| images=NewImageList(); |
| i=0; |
| if (image_info->number_scenes != 0) |
| i=image_info->scene; |
| for ( ; i < (ssize_t) lc->pages; i++) |
| { |
| image=ReadOneDJVUImage(lc,i,image_info,exception); |
| if (image == (Image *) NULL) |
| break; |
| image->scene=i; |
| AppendImageToList(&images,CloneImageList(image,exception)); |
| images->extent=GetBlobSize(image); |
| if (image_info->number_scenes != 0) |
| if (image->scene >= (image_info->scene+image_info->number_scenes-1)) |
| break; |
| } |
| djvu_close_lc(lc); |
| if (images != (Image *) NULL) |
| (void) CloseBlob(images); |
| if (image != (Image *) NULL) |
| image=DestroyImageList(image); |
| |
| #if 0 |
| if ((image->page.width == 0) && (image->page.height == 0)) |
| { |
| image->page.width = image->columns+image->page.x; |
| image->page.height = image->rows+image->page.y; |
| } |
| if (image->columns == 0 || image->rows == 0) |
| { |
| if (logging != MagickFalse) |
| (void) LogMagickEvent(CoderEvent,GetMagickModule(), |
| "exit ReadDJVUImage() with error."); |
| ThrowReaderException(CorruptImageError,"CorruptImage"); |
| } |
| |
| if (logging != MagickFalse) |
| (void) LogMagickEvent(CoderEvent,GetMagickModule(),"exit ReadDJVUImage()"); |
| #endif |
| |
| |
| return(GetFirstImageInList(images)); |
| } |
| #endif |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % R e g i s t e r D J V U I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % RegisterDJVUImage() adds attributes for the DJVU 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 RegisterDJVUImage method is: |
| % |
| % size_t RegisterDJVUImage(void) |
| % |
| */ |
| ModuleExport size_t RegisterDJVUImage(void) |
| { |
| char |
| version[MagickPathExtent]; |
| |
| MagickInfo |
| *entry; |
| |
| static const char |
| *DJVUNote = |
| { |
| "See http://www.djvuzone.org/ for details about the DJVU format. The\n" |
| "DJVU 1.2 specification is available there and at\n" |
| "ftp://swrinde.nde.swri.edu/pub/djvu/documents/." |
| }; |
| |
| *version='\0'; |
| #if defined(DJVU_LIBDJVU_VER_STRING) |
| (void) ConcatenateMagickString(version,"libdjvu ",MagickPathExtent); |
| (void) ConcatenateMagickString(version,DJVU_LIBDJVU_VER_STRING,MagickPathExtent); |
| #endif |
| entry=AcquireMagickInfo("DJVU","DJVU","Deja vu"); |
| #if defined(MAGICKCORE_DJVU_DELEGATE) |
| entry->decoder=(DecodeImageHandler *) ReadDJVUImage; |
| #endif |
| entry->magick=(IsImageFormatHandler *) IsDJVU; |
| entry->flags|=CoderRawSupportFlag; |
| entry->flags^=CoderAdjoinFlag; |
| if (*version != '\0') |
| entry->version=AcquireString(version); |
| entry->note=AcquireString(DJVUNote); |
| (void) RegisterMagickInfo(entry); |
| return(MagickImageCoderSignature); |
| } |
| |
| /* |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % % |
| % % |
| % % |
| % U n r e g i s t e r D J V U I m a g e % |
| % % |
| % % |
| % % |
| %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
| % |
| % UnregisterDJVUImage() removes format registrations made by the |
| % DJVU module from the list of supported formats. |
| % |
| % The format of the UnregisterDJVUImage method is: |
| % |
| % UnregisterDJVUImage(void) |
| % |
| */ |
| ModuleExport void UnregisterDJVUImage(void) |
| { |
| (void) UnregisterMagickInfo("DJVU"); |
| } |
