fbreader/src/formats/pdb/PluckerTextStream.cpp

   1 /*
   2  * Copyright (C) 2004-2008 Geometer Plus <contact@geometerplus.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA.
  18  */
  19
  20 #include <string.h>
  21
  22 #include <ZLFile.h>
  23 #include <ZLZDecompressor.h>
  24
  25 #include "PluckerTextStream.h"
  26 #include "PdbReader.h"
  27 #include "DocDecompressor.h"
  28
  29 PluckerTextStream::PluckerTextStream(ZLFile &file) : PdbStream(file) {
  30         myFullBuffer = 0;
  31 }
  32
  33 PluckerTextStream::~PluckerTextStream() {
  34         close();
  35 }
  36
  37 bool PluckerTextStream::open() {
  38         if (!PdbStream::open()) {
  39                 return false;
  40         }
  41
  42         PdbUtil::readUnsignedShort(*myBase, myCompressionVersion);
  43
  44         myBuffer = new char[65536];
  45         myFullBuffer = new char[65536];
  46
  47         myRecordIndex = 0;
  48
  49         return true;
  50 }
  51
  52 bool PluckerTextStream::fillBuffer() {
  53         while (myBufferOffset == myBufferLength) {
  54                 if (myRecordIndex + 1 > myHeader.Offsets.size() - 1) {
  55                         return false;
  56                 }
  57                 ++myRecordIndex;
  58                 size_t currentOffset = myHeader.Offsets[myRecordIndex];
  59                 if (currentOffset < myBase->offset()) {
  60                         return false;
  61                 }
  62                 myBase->seek(currentOffset, true);
  63                 size_t nextOffset =
  64                         (myRecordIndex + 1 < myHeader.Offsets.size()) ?
  65                                 myHeader.Offsets[myRecordIndex + 1] : myBase->sizeOfOpened();
  66                 if (nextOffset < currentOffset) {
  67                         return false;
  68                 }
  69                 processRecord(nextOffset - currentOffset);
  70         }
  71         return true;
  72 }
  73
  74 void PluckerTextStream::close() {
  75         if (myFullBuffer != 0) {
  76                 delete[] myFullBuffer;
  77                 myFullBuffer = 0;
  78         }
  79         PdbStream::close();
  80 }
  81
  82 void PluckerTextStream::processRecord(size_t recordSize) {
  83         myBase->seek(2, false);
  84
  85         unsigned short paragraphs;
  86         PdbUtil::readUnsignedShort(*myBase, paragraphs);
  87
  88         unsigned short size;
  89         PdbUtil::readUnsignedShort(*myBase, size);
  90
  91         unsigned char type;
  92         myBase->read((char*)&type, 1);
  93         if (type > 1) { // this record is not text record
  94                 return;
  95         }
  96
  97         myBase->seek(1, false);
  98
  99         std::vector<int> pars;
 100         for (int i = 0; i < paragraphs; ++i) {
 101                 unsigned short pSize;
 102                 PdbUtil::readUnsignedShort(*myBase, pSize);
 103                 pars.push_back(pSize);
 104                 myBase->seek(2, false);
 105         }
 106
 107         bool doProcess = false;
 108         if (type == 0) {
 109                 doProcess = myBase->read(myFullBuffer, size) == size;
 110         } else if (myCompressionVersion == 1) {
 111                 doProcess =
 112                         DocDecompressor().decompress(*myBase, myFullBuffer, recordSize - 8 - 4 * paragraphs, size) == size;
 113         } else if (myCompressionVersion == 2) {
 114                 myBase->seek(2, false);
 115                 doProcess =
 116                         ZLZDecompressor(recordSize - 10 - 4 * paragraphs).decompress(*myBase, myFullBuffer, size) == size;
 117         }
 118         if (doProcess) {
 119                 myBufferLength = 0;
 120                 myBufferOffset = 0;
 121
 122                 char *start = myFullBuffer;
 123                 char *end = myFullBuffer;
 124
 125                 for (std::vector<int>::const_iterator it = pars.begin(); it != pars.end(); ++it) {
 126                         start = end;
 127                         end = start + *it;
 128                         if (end > myFullBuffer + size) {
 129                                 break;
 130                         }
 131                         processTextParagraph(start, end);
 132                 }
 133         }
 134 }
 135
 136 void PluckerTextStream::processTextParagraph(char *start, char *end) {
 137         char *textStart = start;
 138         bool functionFlag = false;
 139         for (char *ptr = start; ptr < end; ++ptr) {
 140                 if (*ptr == 0) {
 141                         functionFlag = true;
 142                         if (ptr != textStart) {
 143                                 memcpy(myBuffer + myBufferLength, textStart, ptr - textStart);
 144                                 myBufferLength += ptr - textStart;
 145                         }
 146                 } else if (functionFlag) {
 147                         int paramCounter = ((unsigned char)*ptr) % 8;
 148                         if (end - ptr > paramCounter + 1) {
 149                                 ptr += paramCounter;
 150                         } else {
 151                                 ptr = end - 1;
 152                         }
 153                         functionFlag = false;
 154                         textStart = ptr + 1;
 155                 }
 156         }
 157         if (end != textStart) {
 158                 memcpy(myBuffer + myBufferLength, textStart, end - textStart);
 159                 myBufferLength += end - textStart;
 160         }
 161 }