/*********************************************************************** Copyright 2002-2011 Han The Thanh, This file is part of pdfTeX. pdfTeX is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. pdfTeX is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . This is experimental JBIG2 image support to pdfTeX. JBIG2 image decoding is part of Adobe PDF-1.4, and requires Acroread 5.0 or later. References ========== * 14492 FCD: Information technology -- coded representation of picture and audio information -- lossy/lossless coding of bi-level images / JBIG committee, 1999 July 16. This JBIG2 Working Draft is available from http://www.jpeg.org/public/fcd14492.pdf. The references in the C-code correspond to the sections of this document. * PDF Reference, 5th edition, version 1.6, 1985--2005 Adobe Systems Incorporated. Available online: http://partners.adobe.com/public/developer/en/pdf/PDFReference16.pdf News ==== 31 May 2006: no need to wait for endoffileflag in sequential access organization. 10 May 2006: ygetc() for some catching of broken JBIG2 files; modify to accept Example 3.4 from PDFRef 5th ed. with short end-of-file segment. 09 May 2006: pages_maketree() and segments_maketree() by AVL tree, some cleaning up. 06 May 2006: File list replaced by AVL tree; new_fileinfo(), new_pageinfo(). 04 May 2006: Updated for pdftex-1.40-beta-20060213. 08 Jan. 2003: Added flushjbig2page0objects() function. Now at the end of the pdfTeX run all pending page0 objects are written out. 08 Jan. 2003: Release on private webpage. 04 Jan. 2003: Completely rewritten. Now with some data structures. Rudimentary local file and image bookkeeping. Multiple image inclusion from one JBIG2 file. Only required page0 segments are marked for inclusion. 13 Nov. 2002: pdfcrypting removed. 08 Dec. 2002: bug in page 0 stream writing repaired. Strategy for multiple page inclusion from same JBIG2 file: When writing 1st image, create fresh PDF object for page 0, and include any page 0 segments from complete file (even if these segments are not needed for image). When writing next image, check by filename comparison if PDF object for page 0 of this JBIG2 file has already been written. This can only remember the file name for the direct predecessor JBIG2 image (but images of other types might come inbetween). If such page 0 PDF object exists, reference it. Else create fresh one. 09 Dec. 2002: JBIG2 seg. page numbers > 0 are now set to 1, see PDF Ref. ***********************************************************************/ #include "writejbig2.h" /**********************************************************************/ /**********************************************************************/ struct avl_table *file_tree = NULL; static int comp_file_entry(const void *pa, const void *pb, void *p) { return strcmp(((const FILEINFO *) pa)->filename, ((const FILEINFO *) pb)->filename); } static int comp_page_entry(const void *pa, const void *pb, void *p) { return ((const PAGEINFO *) pa)->pagenum - ((const PAGEINFO *) pb)->pagenum; } static int comp_segment_entry(const void *pa, const void *pb, void *p) { return ((const SEGINFO *) pa)->segnum - ((const SEGINFO *) pb)->segnum; } /**********************************************************************/ int ygetc(FILE * stream) { int c = getc(stream); if (c < 0) { if (c == EOF) pdftex_fail("getc() failed; premature end of JBIG2 image file"); else pdftex_fail("getc() failed (can't happen)"); } return c; } /**********************************************************************/ FILEINFO *new_fileinfo(void) { FILEINFO *fip; fip = xtalloc(1, FILEINFO); fip->file = NULL; fip->filename = NULL; fip->filesize = 0; initlinkedlist(&(fip->pages)); initlinkedlist(&(fip->page0)); fip->filehdrflags = 0; fip->sequentialaccess = false; fip->numofpages = 0; fip->streamstart = 0; fip->pdfpage0objnum = 0; fip->phase = INITIAL; return fip; } PAGEINFO *new_pageinfo(void) { PAGEINFO *pip; pip = xtalloc(1, PAGEINFO); initlinkedlist(&(pip->segments)); pip->pagenum = 0; pip->width = 0; pip->height = 0; pip->xres = 0; pip->yres = 0; pip->pagesegmentflags = 0; pip->stripinginfo = 0; pip->stripedheight = 0; return pip; } static void init_seginfo(SEGINFO * sip) { sip->segnum = 0; sip->isrefered = false; sip->refers = false; sip->seghdrflags = 0; sip->pageassocsizeflag = false; sip->reftosegcount = 0; sip->countofrefered = 0; sip->fieldlen = 0; sip->segnumwidth = 0; sip->segpage = 0; sip->segdatalen = 0; sip->hdrstart = 0; sip->hdrend = 0; sip->datastart = 0; sip->dataend = 0; sip->endofstripeflag = false; sip->endofpageflag = false; sip->pageinfoflag = false; sip->endoffileflag = false; } /**********************************************************************/ void initlinkedlist(LIST * lp) { lp->first = NULL; lp->last = NULL; lp->tree = NULL; } LIST *litem_append(LIST * lp) { LITEM *ip; ip = xtalloc(1, LITEM); if (lp->first == NULL) { lp->first = ip; ip->prev = NULL; } else { lp->last->next = ip; ip->prev = lp->last; } lp->last = ip; ip->next = NULL; ip->d = NULL; return lp; } /**********************************************************************/ void pages_maketree(LIST * plp) { LITEM *ip; void **aa; assert(plp->tree == NULL); plp->tree = avl_create(comp_page_entry, NULL, &avl_xallocator); assert(plp->tree != NULL); for (ip = plp->first; ip != NULL; ip = ip->next) { aa = avl_probe(plp->tree, (PAGEINFO *) ip->d); assert(aa != NULL); } } void segments_maketree(LIST * slp) { LITEM *ip; void **aa; assert(slp->tree == NULL); slp->tree = avl_create(comp_segment_entry, NULL, &avl_xallocator); assert(slp->tree != NULL); for (ip = slp->first; ip != NULL; ip = ip->next) { aa = avl_probe(slp->tree, (SEGINFO *) ip->d); assert(aa != NULL); } } /**********************************************************************/ PAGEINFO *find_pageinfo(LIST * plp, unsigned long pagenum) { PAGEINFO tmp; tmp.pagenum = pagenum; assert(plp->tree != NULL); return (PAGEINFO *) avl_find(plp->tree, &tmp); } SEGINFO *find_seginfo(LIST * slp, unsigned long segnum) { SEGINFO tmp; tmp.segnum = segnum; assert(slp->tree != NULL); return (SEGINFO *) avl_find(slp->tree, &tmp); } /**********************************************************************/ unsigned int read2bytes(FILE * f) { unsigned int c = ygetc(f); return (c << 8) + ygetc(f); } unsigned long read4bytes(FILE * f) { unsigned int l = read2bytes(f); return (l << 16) + read2bytes(f); } /**********************************************************************/ unsigned long getstreamlen(LITEM * slip, boolean refer) { SEGINFO *sip; unsigned long len = 0; for (; slip != NULL; slip = slip->next) { sip = slip->d; if (refer || sip->isrefered) len += sip->hdrend - sip->hdrstart + sip->dataend - sip->datastart; } return len; } /**********************************************************************/ void readfilehdr(FILEINFO * fip) { unsigned int i; /* Annex D.4 File header syntax */ /* Annex D.4.1 ID string */ unsigned char jbig2_id[] = { 0x97, 'J', 'B', '2', 0x0d, 0x0a, 0x1a, 0x0a }; xfseek(fip->file, 0, SEEK_SET, fip->filename); for (i = 0; i < 8; i++) if (ygetc(fip->file) != jbig2_id[i]) pdftex_fail ("readfilehdr(): reading JBIG2 image file failed: ID string missing"); /* Annex D.4.2 File header flags */ fip->filehdrflags = ygetc(fip->file); fip->sequentialaccess = (fip->filehdrflags & 0x01) ? true : false; if (fip->sequentialaccess) { /* Annex D.1 vs. Annex D.2 */ xfseek(fip->file, 0, SEEK_END, fip->filename); fip->filesize = (long) xftello(fip->file, fip->filename); xfseek(fip->file, 9, SEEK_SET, fip->filename); } /* Annex D.4.3 Number of pages */ if (!(fip->filehdrflags >> 1) & 0x01) /* known number of pages */ fip->numofpages = read4bytes(fip->file); /* --- at end of file header --- */ } /**********************************************************************/ /* for first reading of file; return value tells if header been read */ boolean readseghdr(FILEINFO * fip, SEGINFO * sip) { unsigned int i; sip->hdrstart = xftell(fip->file, fip->filename); if (fip->sequentialaccess && sip->hdrstart == fip->filesize) return false; /* no endoffileflag is ok for sequentialaccess */ /* 7.2.2 Segment number */ sip->segnum = read4bytes(fip->file); /* 7.2.3 Segment header flags */ sip->seghdrflags = ygetc(fip->file); checkseghdrflags(sip); if (fip->sequentialaccess && sip->endoffileflag) /* accept shorter segment, */ return true; /* makes it compliant with Example 3.4 of PDFRef. 5th ed. */ sip->pageassocsizeflag = ((sip->seghdrflags >> 6) & 0x01) ? true : false; /* 7.2.4 Referred-to segment count and retention flags */ sip->reftosegcount = (unsigned int) ygetc(fip->file); sip->countofrefered = sip->reftosegcount >> 5; if (sip->countofrefered < 5) sip->fieldlen = 1; else { sip->fieldlen = 5 + sip->countofrefered / 8; xfseek(fip->file, sip->fieldlen - 1, SEEK_CUR, fip->filename); } /* 7.2.5 Referred-to segment numbers */ if (sip->segnum <= 256) sip->segnumwidth = 1; else if (sip->segnum <= 65536) sip->segnumwidth = 2; else sip->segnumwidth = 4; for (i = 0; i < sip->countofrefered; i++) { switch (sip->segnumwidth) { case 1: (void) ygetc(fip->file); break; case 2: (void) read2bytes(fip->file); break; case 4: (void) read4bytes(fip->file); break; } } /* 7.2.6 Segment page association */ if (sip->pageassocsizeflag) sip->segpage = read4bytes(fip->file); else sip->segpage = ygetc(fip->file); /* 7.2.7 Segment data length */ sip->segdatalen = read4bytes(fip->file); sip->hdrend = (long) xftello(fip->file, fip->filename); /* ---- at end of segment header ---- */ return true; } /**********************************************************************/ /* for writing, marks refered page0 segments, sets segpage > 0 to 1 */ void writeseghdr(FILEINFO * fip, SEGINFO * sip) { unsigned int i; unsigned long referedseg = 0; /* 7.2.2 Segment number */ /* 7.2.3 Segment header flags */ /* 7.2.4 Referred-to segment count and retention flags */ for (i = 0; i < 5 + sip->fieldlen; i++) pdfout(ygetc(fip->file)); /* 7.2.5 Referred-to segment numbers */ for (i = 0; i < sip->countofrefered; i++) { switch (sip->segnumwidth) { case 1: referedseg = ygetc(fip->file); pdfout(referedseg); break; case 2: referedseg = read2bytes(fip->file); pdfout((referedseg >> 8) & 0xff); pdfout(referedseg & 0xff); break; case 4: referedseg = read4bytes(fip->file); pdfout((referedseg >> 24) & 0xff); pdfout((referedseg >> 16) & 0xff); pdfout((referedseg >> 8) & 0xff); pdfout(referedseg & 0xff); break; } if (fip->page0.last != NULL && !sip->refers) markpage0seg(fip, referedseg); } if (sip->countofrefered > 0) sip->refers = true; /* 7.2.6 Segment page association */ if (sip->pageassocsizeflag) for (i = 0; i < 3; i++) { (void) ygetc(fip->file); pdfout(0); } (void) ygetc(fip->file); pdfout((sip->segpage > 0) ? 1 : 0); /* 7.2.7 Segment data length */ for (i = 0; i < 4; i++) pdfout(ygetc(fip->file)); /* ---- at end of segment header ---- */ } /**********************************************************************/ /* for recursive marking of refered page0 segments */ void checkseghdr(FILEINFO * fip, SEGINFO * sip) { unsigned int i; unsigned long referedseg = 0; /* 7.2.2 Segment number */ /* 7.2.3 Segment header flags */ /* 7.2.4 Referred-to segment count and retention flags */ xfseek(fip->file, 5 + sip->fieldlen, SEEK_CUR, fip->filename); /* 7.2.5 Referred-to segment numbers */ for (i = 0; i < sip->countofrefered; i++) { switch (sip->segnumwidth) { case 1: referedseg = ygetc(fip->file); break; case 2: referedseg = read2bytes(fip->file); break; case 4: referedseg = read4bytes(fip->file); break; } if (!sip->refers) markpage0seg(fip, referedseg); } if (sip->countofrefered > 0) sip->refers = true; /* 7.2.6 Segment page association */ /* 7.2.7 Segment data length */ if (sip->pageassocsizeflag) xfseek(fip->file, 8, SEEK_CUR, fip->filename); else xfseek(fip->file, 5, SEEK_CUR, fip->filename); /* ---- at end of segment header ---- */ } /**********************************************************************/ void checkseghdrflags(SEGINFO * sip) { sip->endofstripeflag = false; sip->endofpageflag = false; sip->pageinfoflag = false; sip->endoffileflag = false; /* 7.3 Segment types */ switch (sip->seghdrflags & 0x3f) { case M_SymbolDictionary: case M_IntermediateTextRegion: case M_ImmediateTextRegion: case M_ImmediateLosslessTextRegion: case M_PatternDictionary: case M_IntermediateHalftoneRegion: case M_ImmediateHalftoneRegion: case M_ImmediateLosslessHalftoneRegion: case M_IntermediateGenericRegion: case M_ImmediateGenericRegion: case M_ImmediateLosslessGenericRegion: case M_IntermediateGenericRefinementRegion: case M_ImmediateGenericRefinementRegion: case M_ImmediateLosslessGenericRefinementRegion: break; case M_PageInformation: sip->pageinfoflag = true; break; case M_EndOfPage: sip->endofpageflag = true; break; case M_EndOfStripe: sip->endofstripeflag = true; break; case M_EndOfFile: sip->endoffileflag = true; break; case M_Profiles: case M_Tables: case M_Extension: break; default: pdftex_fail ("checkseghdrflags(): unknown segment type in JBIG2 image file"); break; } } /**********************************************************************/ void markpage0seg(FILEINFO * fip, unsigned long referedseg) { PAGEINFO *pip; SEGINFO *sip; pip = fip->page0.first->d; sip = find_seginfo(&(pip->segments), referedseg); if (sip != NULL) { if (!sip->refers && sip->countofrefered > 0) checkseghdr(fip, sip); sip->isrefered = true; } } /**********************************************************************/ unsigned long findstreamstart(FILEINFO * fip) { SEGINFO tmp; assert(!fip->sequentialaccess); /* D.2 Random-access organisation */ do /* find random-access stream start */ (void) readseghdr(fip, &tmp); while (!tmp.endoffileflag); fip->streamstart = tmp.hdrend; readfilehdr(fip); return fip->streamstart; } /**********************************************************************/ void rd_jbig2_info(FILEINFO * fip) { unsigned long seekdist = 0; /* for sequential-access only */ unsigned long streampos = 0; /* for random-access only */ unsigned long currentpage = 0; boolean sipavail = false; PAGEINFO *pip; SEGINFO *sip = NULL; LIST *plp, *slp; fip->file = xfopen(fip->filename, FOPEN_RBIN_MODE); readfilehdr(fip); if (!fip->sequentialaccess) /* D.2 Random-access organisation */ streampos = findstreamstart(fip); while (true) { /* loop over segments */ if (!sipavail) { sip = xtalloc(1, SEGINFO); sipavail = true; } init_seginfo(sip); if (!readseghdr(fip, sip) || sip->endoffileflag) break; if (sip->segpage > 0) { if (sip->segpage > currentpage) { plp = litem_append(&(fip->pages)); plp->last->d = new_pageinfo(); currentpage = sip->segpage; } pip = fip->pages.last->d; } else { if (fip->page0.last == NULL) { plp = litem_append(&(fip->page0)); plp->last->d = new_pageinfo(); } pip = fip->page0.last->d; } if (!sip->endofpageflag) { slp = litem_append(&(pip->segments)); slp->last->d = sip; sipavail = false; } if (!fip->sequentialaccess) sip->datastart = streampos; else sip->datastart = sip->hdrend; sip->dataend = sip->datastart + sip->segdatalen; if (!fip->sequentialaccess && (sip->pageinfoflag || sip->endofstripeflag)) xfseeko(fip->file, (off_t) sip->datastart, SEEK_SET, fip->filename); seekdist = sip->segdatalen; /* 7.4.8 Page information segment syntax */ if (sip->pageinfoflag) { pip->pagenum = sip->segpage; pip->width = read4bytes(fip->file); pip->height = read4bytes(fip->file); pip->xres = read4bytes(fip->file); pip->yres = read4bytes(fip->file); pip->pagesegmentflags = ygetc(fip->file); /* 7.4.8.6 Page striping information */ pip->stripinginfo = read2bytes(fip->file); seekdist -= 19; } if (sip->endofstripeflag) { pip->stripedheight = read4bytes(fip->file); seekdist -= 4; } if (!fip->sequentialaccess && (sip->pageinfoflag || sip->endofstripeflag)) xfseeko(fip->file, (off_t) sip->hdrend, SEEK_SET, fip->filename); if (!fip->sequentialaccess) streampos += sip->segdatalen; if (fip->sequentialaccess) xfseeko(fip->file, (off_t) seekdist, SEEK_CUR, fip->filename); if (sip->endofpageflag && currentpage && (pip->stripinginfo >> 15)) pip->height = pip->stripedheight; } fip->phase = HAVEINFO; if (sipavail) xfree(sip); xfclose(fip->file, fip->filename); } /**********************************************************************/ void wr_jbig2(FILEINFO * fip, unsigned long page) { LITEM *slip; PAGEINFO *pip; SEGINFO *sip; unsigned long i; if (page > 0) { pip = find_pageinfo(&(fip->pages), page); assert(pip != NULL); pdf_puts("/Type /XObject\n"); pdf_puts("/Subtype /Image\n"); pdf_printf("/Width %i\n", pip->width); pdf_printf("/Height %i\n", pip->height); pdf_puts("/ColorSpace /DeviceGray\n"); pdf_puts("/BitsPerComponent 1\n"); pdf_printf("/Length %lu\n", getstreamlen(pip->segments.first, true)); pdf_puts("/Filter [/JBIG2Decode]\n"); if (fip->page0.last != NULL) { if (fip->pdfpage0objnum == 0) { pdfcreateobj(0, 0); fip->pdfpage0objnum = objptr; } pdf_printf("/DecodeParms [<< /JBIG2Globals %lu 0 R >>]\n", fip->pdfpage0objnum); } } else { pip = find_pageinfo(&(fip->page0), page); assert(pip != NULL); pdfbegindict(fip->pdfpage0objnum, 0); pdf_printf("/Length %lu\n", getstreamlen(pip->segments.first, false)); } pdf_puts(">>\n"); pdf_puts("stream\n"); fip->file = xfopen(fip->filename, FOPEN_RBIN_MODE); for (slip = pip->segments.first; slip != NULL; slip = slip->next) { /* loop over page segments */ sip = slip->d; if (sip->isrefered || page > 0) { xfseeko(fip->file, (off_t) sip->hdrstart, SEEK_SET, fip->filename); /* mark refered-to page 0 segments, change segpages > 1 to 1 */ writeseghdr(fip, sip); xfseeko(fip->file, (off_t) sip->datastart, SEEK_SET, fip->filename); for (i = sip->datastart; i < sip->dataend; i++) pdfout(ygetc(fip->file)); } } pdfendstream(); xfclose(fip->file, fip->filename); } /**********************************************************************/ void read_jbig2_info(integer img) { FILEINFO *fip, tmp; PAGEINFO *pip; void **aa; if (jbig2_ptr(img)->selected_page < 1) pdftex_fail ("read_jbig2_info(): page %d not in JBIG2 image file; page must be > 0", (int) jbig2_ptr(img)->selected_page); if (file_tree == NULL) { file_tree = avl_create(comp_file_entry, NULL, &avl_xallocator); assert(file_tree != NULL); } tmp.filename = img_name(img); fip = (FILEINFO *) avl_find(file_tree, &tmp); if (fip == NULL) { fip = new_fileinfo(); fip->filename = xstrdup(img_name(img)); aa = avl_probe(file_tree, fip); assert(aa != NULL); } if (fip->phase == INITIAL) { rd_jbig2_info(fip); pages_maketree(&(fip->pages)); if (fip->page0.last != NULL) { pages_maketree(&(fip->page0)); pip = fip->page0.first->d; segments_maketree(&(pip->segments)); } } pip = find_pageinfo(&(fip->pages), jbig2_ptr(img)->selected_page); if (pip == NULL) pdftex_fail("read_jbig2_info(): page %d not found in JBIG2 image file", (int) jbig2_ptr(img)->selected_page); img_pages(img) = fip->numofpages; img_width(img) = pip->width; img_height(img) = pip->height; img_xres(img) = (int) (pip->xres * 0.0254 + 0.5); img_yres(img) = (int) (pip->yres * 0.0254 + 0.5); } /**********************************************************************/ void write_jbig2(integer img) { FILEINFO *fip, tmp; PAGEINFO *pip; assert(file_tree != NULL); tmp.filename = img_name(img); fip = (FILEINFO *) avl_find(file_tree, &tmp); assert(fip != NULL); assert(fip->phase == HAVEINFO); /* don't write before rd_jbig2_info() call */ pip = find_pageinfo(&(fip->pages), jbig2_ptr(img)->selected_page); assert(pip != NULL); wr_jbig2(fip, pip->pagenum); } /**********************************************************************/ void flushjbig2page0objects(void) { FILEINFO *fip; struct avl_traverser t; if (file_tree != NULL) { avl_t_init(&t, file_tree); for (fip = avl_t_first(&t, file_tree); fip != NULL; fip = avl_t_next(&t)) { if (fip->page0.last != NULL) wr_jbig2(fip, 0); } } } /**********************************************************************/