[patch] xpdf-3.02pl2.patch

xpdf-3.02pl2.patch (text/plain), 20.35 KB, created by Robert Buchholz (RETIRED) on 2007-11-07 11:35:46 UTC

diff -c -r xpdf-3.02pl1.orig/xpdf/Stream.cc xpdf-3.02/xpdf/Stream.cc
*** xpdf-3.02pl1.orig/xpdf/Stream.cc	Thu Oct 25 15:47:38 2007
--- xpdf-3.02/xpdf/Stream.cc	Thu Oct 25 15:48:19 2007
***************
*** 1243,1265 ****
    columns = columnsA;
    if (columns < 1) {
      columns = 1;
!   }
!   if (columns + 4 <= 0) {
!     columns = INT_MAX - 4;
    }
    rows = rowsA;
    endOfBlock = endOfBlockA;
    black = blackA;
!   refLine = (short *)gmallocn(columns + 3, sizeof(short));
!   codingLine = (short *)gmallocn(columns + 2, sizeof(short));
  
    eof = gFalse;
    row = 0;
    nextLine2D = encoding < 0;
    inputBits = 0;
!   codingLine[0] = 0;
!   codingLine[1] = refLine[2] = columns;
!   a0 = 1;
  
    buf = EOF;
  }
--- 1243,1268 ----
    columns = columnsA;
    if (columns < 1) {
      columns = 1;
!   } else if (columns > INT_MAX - 2) {
!     columns = INT_MAX - 2;
    }
    rows = rowsA;
    endOfBlock = endOfBlockA;
    black = blackA;
!   // 0 <= codingLine[0] < codingLine[1] < ... < codingLine[n] = columns
!   // ---> max codingLine size = columns + 1
!   // refLine has one extra guard entry at the end
!   // ---> max refLine size = columns + 2
!   codingLine = (int *)gmallocn(columns + 1, sizeof(int));
!   refLine = (int *)gmallocn(columns + 2, sizeof(int));
  
    eof = gFalse;
    row = 0;
    nextLine2D = encoding < 0;
    inputBits = 0;
!   codingLine[0] = columns;
!   a0i = 0;
!   outputBits = 0;
  
    buf = EOF;
  }
***************
*** 1278,1286 ****
    row = 0;
    nextLine2D = encoding < 0;
    inputBits = 0;
!   codingLine[0] = 0;
!   codingLine[1] = columns;
!   a0 = 1;
    buf = EOF;
  
    // skip any initial zero bits and end-of-line marker, and get the 2D
--- 1281,1289 ----
    row = 0;
    nextLine2D = encoding < 0;
    inputBits = 0;
!   codingLine[0] = columns;
!   a0i = 0;
!   outputBits = 0;
    buf = EOF;
  
    // skip any initial zero bits and end-of-line marker, and get the 2D
***************
*** 1297,1507 ****
    }
  }
  
  int CCITTFaxStream::lookChar() {
    short code1, code2, code3;
!   int a0New;
!   GBool err, gotEOL;
!   int ret;
!   int bits, i;
  
!   // if at eof just return EOF
!   if (eof && codingLine[a0] >= columns) {
!     return EOF;
    }
  
    // read the next row
!   err = gFalse;
!   if (codingLine[a0] >= columns) {
  
      // 2-D encoding
      if (nextLine2D) {
-       // state:
-       //   a0New = current position in coding line (0 <= a0New <= columns)
-       //   codingLine[a0] = last change in coding line
-       //                    (black-to-white if a0 is even,
-       //                     white-to-black if a0 is odd)
-       //   refLine[b1] = next change in reference line of opposite color
-       //                 to a0
-       // invariants:
-       //   0 <= codingLine[a0] <= a0New
-       //           <= refLine[b1] <= refLine[b1+1] <= columns
-       //   0 <= a0 <= columns+1
-       //   refLine[0] = 0
-       //   refLine[n] = refLine[n+1] = columns
-       //     -- for some 1 <= n <= columns+1
-       // end condition:
-       //   0 = codingLine[0] <= codingLine[1] < codingLine[2] < ...
-       //     < codingLine[n-1] < codingLine[n] = columns
-       //     -- where 1 <= n <= columns+1
        for (i = 0; codingLine[i] < columns; ++i) {
  	refLine[i] = codingLine[i];
        }
!       refLine[i] = refLine[i + 1] = columns;
!       b1 = 1;
!       a0New = codingLine[a0 = 0] = 0;
!       do {
  	code1 = getTwoDimCode();
  	switch (code1) {
  	case twoDimPass:
! 	  if (refLine[b1] < columns) {
! 	    a0New = refLine[b1 + 1];
! 	    b1 += 2;
  	  }
  	  break;
  	case twoDimHoriz:
! 	  if ((a0 & 1) == 0) {
! 	    code1 = code2 = 0;
  	    do {
! 	      code1 += code3 = getWhiteCode();
  	    } while (code3 >= 64);
  	    do {
! 	      code2 += code3 = getBlackCode();
  	    } while (code3 >= 64);
  	  } else {
- 	    code1 = code2 = 0;
  	    do {
! 	      code1 += code3 = getBlackCode();
  	    } while (code3 >= 64);
  	    do {
! 	      code2 += code3 = getWhiteCode();
  	    } while (code3 >= 64);
  	  }
! 	  if (code1 > 0 || code2 > 0) {
! 	    if (a0New + code1 <= columns) {
! 	      codingLine[a0 + 1] = a0New + code1;
! 	    } else {
! 	      codingLine[a0 + 1] = columns;
! 	    }
! 	    ++a0;
! 	    if (codingLine[a0] + code2 <= columns) {
! 	      codingLine[a0 + 1] = codingLine[a0] + code2;
! 	    } else {
! 	      codingLine[a0 + 1] = columns;
! 	    }
! 	    ++a0;
! 	    a0New = codingLine[a0];
! 	    while (refLine[b1] <= a0New && refLine[b1] < columns) {
! 	      b1 += 2;
  	    }
  	  }
  	  break;
! 	case twoDimVert0:
! 	  if (refLine[b1] < columns) {
! 	    a0New = codingLine[++a0] = refLine[b1];
! 	    ++b1;
! 	    while (refLine[b1] <= a0New && refLine[b1] < columns) {
! 	      b1 += 2;
  	    }
- 	  } else {
- 	    a0New = codingLine[++a0] = columns;
  	  }
  	  break;
  	case twoDimVertR1:
! 	  if (refLine[b1] + 1 < columns) {
! 	    a0New = codingLine[++a0] = refLine[b1] + 1;
! 	    ++b1;
! 	    while (refLine[b1] <= a0New && refLine[b1] < columns) {
! 	      b1 += 2;
  	    }
- 	  } else {
- 	    a0New = codingLine[++a0] = columns;
  	  }
  	  break;
! 	case twoDimVertL1:
! 	  if (refLine[b1] - 1 > a0New || (a0 == 0 && refLine[b1] == 1)) {
! 	    a0New = codingLine[++a0] = refLine[b1] - 1;
! 	    --b1;
! 	    while (refLine[b1] <= a0New && refLine[b1] < columns) {
! 	      b1 += 2;
  	    }
  	  }
  	  break;
! 	case twoDimVertR2:
! 	  if (refLine[b1] + 2 < columns) {
! 	    a0New = codingLine[++a0] = refLine[b1] + 2;
! 	    ++b1;
! 	    while (refLine[b1] <= a0New && refLine[b1] < columns) {
! 	      b1 += 2;
  	    }
- 	  } else {
- 	    a0New = codingLine[++a0] = columns;
  	  }
  	  break;
  	case twoDimVertL2:
! 	  if (refLine[b1] - 2 > a0New || (a0 == 0 && refLine[b1] == 2)) {
! 	    a0New = codingLine[++a0] = refLine[b1] - 2;
! 	    --b1;
! 	    while (refLine[b1] <= a0New && refLine[b1] < columns) {
! 	      b1 += 2;
  	    }
! 	  }
! 	  break;
! 	case twoDimVertR3:
! 	  if (refLine[b1] + 3 < columns) {
! 	    a0New = codingLine[++a0] = refLine[b1] + 3;
! 	    ++b1;
! 	    while (refLine[b1] <= a0New && refLine[b1] < columns) {
! 	      b1 += 2;
  	    }
- 	  } else {
- 	    a0New = codingLine[++a0] = columns;
  	  }
  	  break;
! 	case twoDimVertL3:
! 	  if (refLine[b1] - 3 > a0New || (a0 == 0 && refLine[b1] == 3)) {
! 	    a0New = codingLine[++a0] = refLine[b1] - 3;
! 	    --b1;
! 	    while (refLine[b1] <= a0New && refLine[b1] < columns) {
! 	      b1 += 2;
  	    }
  	  }
  	  break;
  	case EOF:
  	  eof = gTrue;
! 	  codingLine[a0 = 0] = columns;
! 	  return EOF;
  	default:
  	  error(getPos(), "Bad 2D code %04x in CCITTFax stream", code1);
  	  err = gTrue;
  	  break;
  	}
!       } while (codingLine[a0] < columns);
  
      // 1-D encoding
      } else {
!       codingLine[a0 = 0] = 0;
!       while (1) {
  	code1 = 0;
! 	do {
! 	  code1 += code3 = getWhiteCode();
! 	} while (code3 >= 64);
! 	codingLine[a0+1] = codingLine[a0] + code1;
! 	++a0;
! 	if (codingLine[a0] >= columns) {
! 	  break;
! 	}
! 	code2 = 0;
! 	do {
! 	  code2 += code3 = getBlackCode();
! 	} while (code3 >= 64);
! 	codingLine[a0+1] = codingLine[a0] + code2;
! 	++a0;
! 	if (codingLine[a0] >= columns) {
! 	  break;
  	}
        }
      }
  
-     if (codingLine[a0] != columns) {
-       error(getPos(), "CCITTFax row is wrong length (%d)", codingLine[a0]);
-       // force the row to be the correct length
-       while (codingLine[a0] > columns) {
- 	--a0;
-       }
-       codingLine[++a0] = columns;
-       err = gTrue;
-     }
- 
      // byte-align the row
      if (byteAlign) {
        inputBits &= ~7;
--- 1300,1529 ----
    }
  }
  
+ inline void CCITTFaxStream::addPixels(int a1, int blackPixels) {
+   if (a1 > codingLine[a0i]) {
+     if (a1 > columns) {
+       error(getPos(), "CCITTFax row is wrong length (%d)", a1);
+       err = gTrue;
+       a1 = columns;
+     }
+     if ((a0i & 1) ^ blackPixels) {
+       ++a0i;
+     }
+     codingLine[a0i] = a1;
+   }
+ }
+ 
+ inline void CCITTFaxStream::addPixelsNeg(int a1, int blackPixels) {
+   if (a1 > codingLine[a0i]) {
+     if (a1 > columns) {
+       error(getPos(), "CCITTFax row is wrong length (%d)", a1);
+       err = gTrue;
+       a1 = columns;
+     }
+     if ((a0i & 1) ^ blackPixels) {
+       ++a0i;
+     }
+     codingLine[a0i] = a1;
+   } else if (a1 < codingLine[a0i]) {
+     if (a1 < 0) {
+       error(getPos(), "Invalid CCITTFax code");
+       err = gTrue;
+       a1 = 0;
+     }
+     while (a0i > 0 && a1 <= codingLine[a0i - 1]) {
+       --a0i;
+     }
+     codingLine[a0i] = a1;
+   }
+ }
+ 
  int CCITTFaxStream::lookChar() {
    short code1, code2, code3;
!   int b1i, blackPixels, i, bits;
!   GBool gotEOL;
  
!   if (buf != EOF) {
!     return buf;
    }
  
    // read the next row
!   if (outputBits == 0) {
! 
!     // if at eof just return EOF
!     if (eof) {
!       return EOF;
!     }
! 
!     err = gFalse;
  
      // 2-D encoding
      if (nextLine2D) {
        for (i = 0; codingLine[i] < columns; ++i) {
  	refLine[i] = codingLine[i];
        }
!       refLine[i++] = columns;
!       refLine[i] = columns;
!       codingLine[0] = 0;
!       a0i = 0;
!       b1i = 0;
!       blackPixels = 0;
!       // invariant:
!       // refLine[b1i-1] <= codingLine[a0i] < refLine[b1i] < refLine[b1i+1]
!       //                                                             <= columns
!       // exception at left edge:
!       //   codingLine[a0i = 0] = refLine[b1i = 0] = 0 is possible
!       // exception at right edge:
!       //   refLine[b1i] = refLine[b1i+1] = columns is possible
!       while (codingLine[a0i] < columns) {
  	code1 = getTwoDimCode();
  	switch (code1) {
  	case twoDimPass:
! 	  addPixels(refLine[b1i + 1], blackPixels);
! 	  if (refLine[b1i + 1] < columns) {
! 	    b1i += 2;
  	  }
  	  break;
  	case twoDimHoriz:
! 	  code1 = code2 = 0;
! 	  if (blackPixels) {
  	    do {
! 	      code1 += code3 = getBlackCode();
  	    } while (code3 >= 64);
  	    do {
! 	      code2 += code3 = getWhiteCode();
  	    } while (code3 >= 64);
  	  } else {
  	    do {
! 	      code1 += code3 = getWhiteCode();
  	    } while (code3 >= 64);
  	    do {
! 	      code2 += code3 = getBlackCode();
  	    } while (code3 >= 64);
  	  }
! 	  addPixels(codingLine[a0i] + code1, blackPixels);
! 	  if (codingLine[a0i] < columns) {
! 	    addPixels(codingLine[a0i] + code2, blackPixels ^ 1);
! 	  }
! 	  while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
! 	    b1i += 2;
! 	  }
! 	  break;
! 	case twoDimVertR3:
! 	  addPixels(refLine[b1i] + 3, blackPixels);
! 	  blackPixels ^= 1;
! 	  if (codingLine[a0i] < columns) {
! 	    ++b1i;
! 	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
! 	      b1i += 2;
  	    }
  	  }
  	  break;
! 	case twoDimVertR2:
! 	  addPixels(refLine[b1i] + 2, blackPixels);
! 	  blackPixels ^= 1;
! 	  if (codingLine[a0i] < columns) {
! 	    ++b1i;
! 	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
! 	      b1i += 2;
  	    }
  	  }
  	  break;
  	case twoDimVertR1:
! 	  addPixels(refLine[b1i] + 1, blackPixels);
! 	  blackPixels ^= 1;
! 	  if (codingLine[a0i] < columns) {
! 	    ++b1i;
! 	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
! 	      b1i += 2;
  	    }
  	  }
  	  break;
! 	case twoDimVert0:
! 	  addPixels(refLine[b1i], blackPixels);
! 	  blackPixels ^= 1;
! 	  if (codingLine[a0i] < columns) {
! 	    ++b1i;
! 	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
! 	      b1i += 2;
  	    }
  	  }
  	  break;
! 	case twoDimVertL3:
! 	  addPixelsNeg(refLine[b1i] - 3, blackPixels);
! 	  blackPixels ^= 1;
! 	  if (codingLine[a0i] < columns) {
! 	    if (b1i > 0) {
! 	      --b1i;
! 	    } else {
! 	      ++b1i;
! 	    }
! 	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
! 	      b1i += 2;
  	    }
  	  }
  	  break;
  	case twoDimVertL2:
! 	  addPixelsNeg(refLine[b1i] - 2, blackPixels);
! 	  blackPixels ^= 1;
! 	  if (codingLine[a0i] < columns) {
! 	    if (b1i > 0) {
! 	      --b1i;
! 	    } else {
! 	      ++b1i;
  	    }
! 	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
! 	      b1i += 2;
  	    }
  	  }
  	  break;
! 	case twoDimVertL1:
! 	  addPixelsNeg(refLine[b1i] - 1, blackPixels);
! 	  blackPixels ^= 1;
! 	  if (codingLine[a0i] < columns) {
! 	    if (b1i > 0) {
! 	      --b1i;
! 	    } else {
! 	      ++b1i;
! 	    }
! 	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
! 	      b1i += 2;
  	    }
  	  }
  	  break;
  	case EOF:
+ 	  addPixels(columns, 0);
  	  eof = gTrue;
! 	  break;
  	default:
  	  error(getPos(), "Bad 2D code %04x in CCITTFax stream", code1);
+ 	  addPixels(columns, 0);
  	  err = gTrue;
  	  break;
  	}
!       }
  
      // 1-D encoding
      } else {
!       codingLine[0] = 0;
!       a0i = 0;
!       blackPixels = 0;
!       while (codingLine[a0i] < columns) {
  	code1 = 0;
! 	if (blackPixels) {
! 	  do {
! 	    code1 += code3 = getBlackCode();
! 	  } while (code3 >= 64);
! 	} else {
! 	  do {
! 	    code1 += code3 = getWhiteCode();
! 	  } while (code3 >= 64);
  	}
+ 	addPixels(codingLine[a0i] + code1, blackPixels);
+ 	blackPixels ^= 1;
        }
      }
  
      // byte-align the row
      if (byteAlign) {
        inputBits &= ~7;
***************
*** 1560,1573 ****
      // this if we know the stream contains end-of-line markers because
      // the "just plow on" technique tends to work better otherwise
      } else if (err && endOfLine) {
!       do {
  	if (code1 == EOF) {
  	  eof = gTrue;
  	  return EOF;
  	}
  	eatBits(1);
! 	code1 = lookBits(13);
!       } while ((code1 >> 1) != 0x001);
        eatBits(12); 
        if (encoding > 0) {
  	eatBits(1);
--- 1582,1598 ----
      // this if we know the stream contains end-of-line markers because
      // the "just plow on" technique tends to work better otherwise
      } else if (err && endOfLine) {
!       while (1) {
! 	code1 = lookBits(13);
  	if (code1 == EOF) {
  	  eof = gTrue;
  	  return EOF;
  	}
+ 	if ((code1 >> 1) == 0x001) {
+ 	  break;
+ 	}
  	eatBits(1);
!       }
        eatBits(12); 
        if (encoding > 0) {
  	eatBits(1);
***************
*** 1575,1585 ****
        }
      }
  
!     a0 = 0;
!     outputBits = codingLine[1] - codingLine[0];
!     if (outputBits == 0) {
!       a0 = 1;
!       outputBits = codingLine[2] - codingLine[1];
      }
  
      ++row;
--- 1600,1610 ----
        }
      }
  
!     // set up for output
!     if (codingLine[0] > 0) {
!       outputBits = codingLine[a0i = 0];
!     } else {
!       outputBits = codingLine[a0i = 1];
      }
  
      ++row;
***************
*** 1587,1625 ****
  
    // get a byte
    if (outputBits >= 8) {
!     ret = ((a0 & 1) == 0) ? 0xff : 0x00;
!     if ((outputBits -= 8) == 0) {
!       ++a0;
!       if (codingLine[a0] < columns) {
! 	outputBits = codingLine[a0 + 1] - codingLine[a0];
!       }
      }
    } else {
      bits = 8;
!     ret = 0;
      do {
        if (outputBits > bits) {
! 	i = bits;
! 	bits = 0;
! 	if ((a0 & 1) == 0) {
! 	  ret |= 0xff >> (8 - i);
  	}
! 	outputBits -= i;
        } else {
! 	i = outputBits;
! 	bits -= outputBits;
! 	if ((a0 & 1) == 0) {
! 	  ret |= (0xff >> (8 - i)) << bits;
  	}
  	outputBits = 0;
! 	++a0;
! 	if (codingLine[a0] < columns) {
! 	  outputBits = codingLine[a0 + 1] - codingLine[a0];
  	}
        }
!     } while (bits > 0 && codingLine[a0] < columns);
    }
-   buf = black ? (ret ^ 0xff) : ret;
    return buf;
  }
  
--- 1612,1654 ----
  
    // get a byte
    if (outputBits >= 8) {
!     buf = (a0i & 1) ? 0x00 : 0xff;
!     outputBits -= 8;
!     if (outputBits == 0 && codingLine[a0i] < columns) {
!       ++a0i;
!       outputBits = codingLine[a0i] - codingLine[a0i - 1];
      }
    } else {
      bits = 8;
!     buf = 0;
      do {
        if (outputBits > bits) {
! 	buf <<= bits;
! 	if (!(a0i & 1)) {
! 	  buf |= 0xff >> (8 - bits);
  	}
! 	outputBits -= bits;
! 	bits = 0;
        } else {
! 	buf <<= outputBits;
! 	if (!(a0i & 1)) {
! 	  buf |= 0xff >> (8 - outputBits);
  	}
+ 	bits -= outputBits;
  	outputBits = 0;
! 	if (codingLine[a0i] < columns) {
! 	  ++a0i;
! 	  outputBits = codingLine[a0i] - codingLine[a0i - 1];
! 	} else if (bits > 0) {
! 	  buf <<= bits;
! 	  bits = 0;
  	}
        }
!     } while (bits);
!   }
!   if (black) {
!     buf ^= 0xff;
    }
    return buf;
  }
  
***************
*** 1661,1666 ****
--- 1690,1698 ----
    code = 0; // make gcc happy
    if (endOfBlock) {
      code = lookBits(12);
+     if (code == EOF) {
+       return 1;
+     }
      if ((code >> 5) == 0) {
        p = &whiteTab1[code];
      } else {
***************
*** 1673,1678 ****
--- 1705,1713 ----
    } else {
      for (n = 1; n <= 9; ++n) {
        code = lookBits(n);
+       if (code == EOF) {
+ 	return 1;
+       }
        if (n < 9) {
  	code <<= 9 - n;
        }
***************
*** 1684,1689 ****
--- 1719,1727 ----
      }
      for (n = 11; n <= 12; ++n) {
        code = lookBits(n);
+       if (code == EOF) {
+ 	return 1;
+       }
        if (n < 12) {
  	code <<= 12 - n;
        }
***************
*** 1709,1717 ****
    code = 0; // make gcc happy
    if (endOfBlock) {
      code = lookBits(13);
      if ((code >> 7) == 0) {
        p = &blackTab1[code];
!     } else if ((code >> 9) == 0) {
        p = &blackTab2[(code >> 1) - 64];
      } else {
        p = &blackTab3[code >> 7];
--- 1747,1758 ----
    code = 0; // make gcc happy
    if (endOfBlock) {
      code = lookBits(13);
+     if (code == EOF) {
+       return 1;
+     }
      if ((code >> 7) == 0) {
        p = &blackTab1[code];
!     } else if ((code >> 9) == 0 && (code >> 7) != 0) {
        p = &blackTab2[(code >> 1) - 64];
      } else {
        p = &blackTab3[code >> 7];
***************
*** 1723,1728 ****
--- 1764,1772 ----
    } else {
      for (n = 2; n <= 6; ++n) {
        code = lookBits(n);
+       if (code == EOF) {
+ 	return 1;
+       }
        if (n < 6) {
  	code <<= 6 - n;
        }
***************
*** 1734,1739 ****
--- 1778,1786 ----
      }
      for (n = 7; n <= 12; ++n) {
        code = lookBits(n);
+       if (code == EOF) {
+ 	return 1;
+       }
        if (n < 12) {
  	code <<= 12 - n;
        }
***************
*** 1747,1752 ****
--- 1794,1802 ----
      }
      for (n = 10; n <= 13; ++n) {
        code = lookBits(n);
+       if (code == EOF) {
+ 	return 1;
+       }
        if (n < 13) {
  	code <<= 13 - n;
        }
***************
*** 1961,1966 ****
--- 2011,2022 ----
      // allocate a buffer for the whole image
      bufWidth = ((width + mcuWidth - 1) / mcuWidth) * mcuWidth;
      bufHeight = ((height + mcuHeight - 1) / mcuHeight) * mcuHeight;
+     if (bufWidth <= 0 || bufHeight <= 0 ||
+ 	bufWidth > INT_MAX / bufWidth / (int)sizeof(int)) {
+       error(getPos(), "Invalid image size in DCT stream");
+       y = height;
+       return;
+     }
      for (i = 0; i < numComps; ++i) {
        frameBuf[i] = (int *)gmallocn(bufWidth * bufHeight, sizeof(int));
        memset(frameBuf[i], 0, bufWidth * bufHeight * sizeof(int));
***************
*** 3036,3041 ****
--- 3092,3102 ----
    }
    scanInfo.firstCoeff = str->getChar();
    scanInfo.lastCoeff = str->getChar();
+   if (scanInfo.firstCoeff < 0 || scanInfo.lastCoeff > 63 ||
+       scanInfo.firstCoeff > scanInfo.lastCoeff) {
+     error(getPos(), "Bad DCT coefficient numbers in scan info block");
+     return gFalse;
+   }
    c = str->getChar();
    scanInfo.ah = (c >> 4) & 0x0f;
    scanInfo.al = c & 0x0f;
diff -c -r xpdf-3.02pl1.orig/xpdf/Stream.h xpdf-3.02/xpdf/Stream.h
*** xpdf-3.02pl1.orig/xpdf/Stream.h	Tue Feb 27 14:05:52 2007
--- xpdf-3.02/xpdf/Stream.h	Thu Oct 25 15:48:15 2007
***************
*** 528,540 ****
    int row;			// current row
    int inputBuf;			// input buffer
    int inputBits;		// number of bits in input buffer
!   short *refLine;		// reference line changing elements
!   int b1;			// index into refLine
!   short *codingLine;		// coding line changing elements
!   int a0;			// index into codingLine
    int outputBits;		// remaining ouput bits
    int buf;			// character buffer
  
    short getTwoDimCode();
    short getWhiteCode();
    short getBlackCode();
--- 528,542 ----
    int row;			// current row
    int inputBuf;			// input buffer
    int inputBits;		// number of bits in input buffer
!   int *codingLine;		// coding line changing elements
!   int *refLine;			// reference line changing elements
!   int a0i;			// index into codingLine
!   GBool err;			// error on current line
    int outputBits;		// remaining ouput bits
    int buf;			// character buffer
  
+   void addPixels(int a1, int black);
+   void addPixelsNeg(int a1, int black);
    short getTwoDimCode();
    short getWhiteCode();
    short getBlackCode();