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278 lines
8.9 KiB
278 lines
8.9 KiB
/* |
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* Copyright (c) 1994 Paul Vojta. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* NOTE: |
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* xdvi is based on prior work as noted in the modification history, below. |
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*/ |
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/* |
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* DVI previewer for X. |
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* |
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* Eric Cooper, CMU, September 1985. |
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* |
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* Code derived from dvi-imagen.c. |
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* |
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* Modification history: |
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* 1/1986 Modified for X.10 --Bob Scheifler, MIT LCS. |
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* 7/1988 Modified for X.11 --Mark Eichin, MIT |
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* 12/1988 Added 'R' option, toolkit, magnifying glass |
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* --Paul Vojta, UC Berkeley. |
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* 2/1989 Added tpic support --Jeffrey Lee, U of Toronto |
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* 4/1989 Modified for System V --Donald Richardson, Clarkson Univ. |
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* 3/1990 Added VMS support --Scott Allendorf, U of Iowa |
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* 7/1990 Added reflection mode --Michael Pak, Hebrew U of Jerusalem |
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* 1/1992 Added greyscale code --Till Brychcy, Techn. Univ. Muenchen |
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* and Lee Hetherington, MIT |
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* 4/1994 Added DPS support, bounding box |
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* --Ricardo Telichevesky |
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* and Luis Miguel Silveira, MIT RLE. |
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*/ |
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#include <kdebug.h> |
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#include <klocale.h> |
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#include <stdlib.h> |
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extern "C" { |
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#include "dvi.h" |
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} |
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#include "dvi_init.h" |
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#include "fontpool.h" |
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#include "xdvi.h" |
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void dvifile::process_preamble(void) |
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{ |
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command_pointer = dvi_Data; |
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Q_UINT8 magic_number = readUINT8(); |
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if (magic_number != PRE) { |
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errorMsg = i18n("The DVI file does not start with the preamble."); |
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return; |
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} |
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magic_number = readUINT8(); |
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if (magic_number != 2) { |
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errorMsg = i18n("The DVI file contains the wrong version of DVI output for this program. " |
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"Hint: If you use the typesetting system Omega, you have to use a special " |
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"program, such as oxdvi."); |
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return; |
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} |
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/** numerator, denominator and the magnification value that describe |
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how many centimeters there are in one TeX unit, as explained in |
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section A.3 of the DVI driver standard, Level 0, published by |
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the TUG DVI driver standards committee. */ |
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Q_UINT32 numerator = readUINT32(); |
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Q_UINT32 denominator = readUINT32(); |
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magnification = readUINT32(); |
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cmPerDVIunit = (double(numerator) / double(denominator)) * (double(magnification) / 1000.0) * (1.0 / 1e5); |
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// Read the generatorString (such as "TeX output ..." from the |
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// DVI-File). The variable "magic_number" holds the length of the |
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// string. |
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char job_id[300]; |
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magic_number = readUINT8(); |
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strncpy(job_id, (char *)command_pointer, magic_number); |
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job_id[magic_number] = '\0'; |
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generatorString = job_id; |
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} |
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/** find_postamble locates the beginning of the postamble and leaves |
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the file ready to start reading at that location. */ |
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void dvifile::find_postamble(void) |
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{ |
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// Move backwards through the TRAILER bytes |
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command_pointer = dvi_Data + size_of_file - 1; |
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while((*command_pointer == TRAILER) && (command_pointer > dvi_Data)) |
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command_pointer--; |
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if (command_pointer == dvi_Data) { |
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errorMsg = i18n("The DVI file is badly corrupted. KDVI was not able to find the postamble."); |
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return; |
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} |
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// And this is finally the pointer to the beginning of the postamble |
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command_pointer -= 4; |
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beginning_of_postamble = readUINT32(); |
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command_pointer = dvi_Data + beginning_of_postamble; |
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} |
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void dvifile::read_postamble(void) |
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{ |
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Q_UINT8 magic_byte = readUINT8(); |
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if (magic_byte != POST) { |
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errorMsg = i18n("The postamble does not begin with the POST command."); |
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return; |
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} |
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last_page_offset = readUINT32(); |
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// Skip the numerator, denominator and magnification, the largest |
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// box height and width and the maximal depth of the stack. These |
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// are not used at the moment. |
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command_pointer += 4 + 4 + 4 + 4 + 4 + 2; |
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// The number of pages is more interesting for us. |
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total_pages = readUINT16(); |
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// As a next step, read the font definitions. |
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Q_UINT8 cmnd = readUINT8(); |
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while (cmnd >= FNTDEF1 && cmnd <= FNTDEF4) { |
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Q_UINT32 TeXnumber = readUINT(cmnd-FNTDEF1+1); |
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Q_UINT32 checksum = readUINT32(); // Checksum of the font, as found by TeX in the TFM file |
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// Read scale and design factor, and the name of the font. All |
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// these are explained in section A.4 of the DVI driver standard, |
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// Level 0, published by the TUG DVI driver standards committee |
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Q_UINT32 scale = readUINT32(); |
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Q_UINT32 design = readUINT32(); |
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Q_UINT16 len = readUINT8() + readUINT8(); // Length of the font name, including the directory name |
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char *fontname = new char[len + 1]; |
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strncpy(fontname, (char *)command_pointer, len ); |
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fontname[len] = '\0'; |
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command_pointer += len; |
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#ifdef DEBUG_FONTS |
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kdDebug() << "Postamble: define font \"" << fontname << "\" scale=" << scale << " design=" << design << endl; |
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#endif |
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// According to section A.4 of the DVI driver standard, this font |
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// shall be enlarged by the following factor before it is used. |
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double enlargement_factor = (double(scale) * double(magnification))/(double(design) * 1000.0); |
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struct font *fontp = font_pool->appendx(fontname, checksum, scale, enlargement_factor, cmPerDVIunit); |
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// Insert font in dictionary and make sure the dictionary is big |
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// enough. |
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if (tn_table.size()-2 <= tn_table.count()) |
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// Not quite optimal. The size of the dictionary should be a |
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// prime for optimal performance. I don't care. |
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tn_table.resize(tn_table.size()*2); |
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tn_table.insert(TeXnumber, fontp); |
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// Read the next command |
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cmnd = readUINT8(); |
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} |
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if (cmnd != POSTPOST) { |
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errorMsg = i18n("The postamble contained a command other than FNTDEF."); |
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return; |
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} |
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// Now we remove all those fonts from the memory which are no longer |
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// in use. |
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font_pool->release_fonts(); |
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} |
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void dvifile::prepare_pages() |
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{ |
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#ifdef DEBUG_DVIFILE |
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kdDebug() << "prepare_pages" << endl; |
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#endif |
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page_offset = new Q_UINT32[total_pages+1]; |
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if (page_offset == 0) { |
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kdError(4300) << "No memory for page list!" << endl; |
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return; |
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} |
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page_offset[total_pages] = beginning_of_postamble; |
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Q_UINT16 i = total_pages-1; |
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page_offset[i] = last_page_offset; |
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// Follow back pointers through pages in the DVI file, storing the |
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// offsets in the page_offset table. |
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// @@@@ ADD CHECK FOR CONSISTENCY !!! NEVER LET THE COMMAND PTR POINT OUTSIDE THE ALLOCATED MEM !!!! |
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while (i > 0) { |
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command_pointer = dvi_Data + page_offset[i--]; |
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if (readUINT8() != BOP) { |
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errorMsg = i18n("The page %1 does not start with the BOP command.").arg(i+1); |
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return; |
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} |
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command_pointer += 10 * 4; |
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page_offset[i] = readUINT32(); |
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if ((dvi_Data+page_offset[i] < dvi_Data)||(dvi_Data+page_offset[i] > dvi_Data+size_of_file)) |
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page_offset[i] = 0; |
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} |
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} |
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dvifile::dvifile(QString fname, fontPool *pool, bool sourceSpecialMark) |
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{ |
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#ifdef DEBUG_DVIFILE |
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kdDebug() << "init_dvi_file: " << fname << endl; |
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#endif |
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errorMsg = QString::null; |
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dvi_Data = 0; |
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page_offset = 0; |
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font_pool = pool; |
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sourceSpecialMarker = sourceSpecialMark; |
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QFile file(fname); |
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filename = file.name(); |
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file.open( IO_ReadOnly ); |
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size_of_file = file.size(); |
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dvi_Data = new Q_UINT8[size_of_file]; |
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// Sets the end pointer for the bigEndianByteReader so that the |
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// whole memory buffer is readable |
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end_pointer = dvi_Data+size_of_file; |
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if (dvi_Data == 0) { |
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kdError() << i18n("Not enough memory to load the DVI-file."); |
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return; |
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} |
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file.readBlock((char *)dvi_Data, size_of_file); |
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file.close(); |
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if (file.status() != IO_Ok) { |
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kdError() << i18n("Could not load the DVI-file."); |
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return; |
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} |
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tn_table.clear(); |
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process_preamble(); |
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find_postamble(); |
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read_postamble(); |
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prepare_pages(); |
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return; |
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} |
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dvifile::~dvifile() |
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{ |
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#ifdef DEBUG_DVIFILE |
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kdDebug() << "destroy dvi-file" << endl; |
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#endif |
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if (dvi_Data != 0) |
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delete [] dvi_Data; |
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if (font_pool != 0) |
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font_pool->mark_fonts_as_unused(); |
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if (page_offset != NULL) |
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delete [] page_offset; |
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}
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