fix for files with incomplete DCT data

diff --git a/lib/pdf/xpdf-changes.patch b/lib/pdf/xpdf-changes.patch
index e829b2e..a4e27bc 100644 (file)
--- a/lib/pdf/xpdf-changes.patch
+++ b/lib/pdf/xpdf-changes.patch
@@ -1052,6 +1052,56 @@
  #endif
  #include <string.h>
  #include <ctype.h>
+@@ -2456,6 +2460,9 @@
+   // check for an EOB run
+   if (eobRun > 0) {
+     while (i <= scanInfo.lastCoeff) {
++      if(i>=64) {
++        return gFalse;
++      }
+       j = dctZigZag[i++];
+       if (data[j] != 0) {
+       if ((bit = readBit()) == EOF) {
+@@ -2480,6 +2487,9 @@
+     if (c == 0xf0) {
+       k = 0;
+       while (k < 16) {
++        if(i>=64) {
++        return gFalse;
++      }
+       j = dctZigZag[i++];
+       if (data[j] == 0) {
+         ++k;
+@@ -2505,6 +2515,9 @@
+       }
+       eobRun += 1 << j;
+       while (i <= scanInfo.lastCoeff) {
++      if(i>=64) {
++        return gFalse;
++      }
+       j = dctZigZag[i++];
+       if (data[j] != 0) {
+         if ((bit = readBit()) == EOF) {
+@@ -2527,6 +2540,9 @@
+       }
+       k = 0;
+       do {
++      if(i>=64) {
++        return gFalse;
++      }
+       j = dctZigZag[i++];
+       while (data[j] != 0) {
+         if ((bit = readBit()) == EOF) {
+@@ -2535,6 +2551,9 @@
+         if (bit) {
+           data[j] += 1 << scanInfo.al;
+         }
++        if(i>=64) {
++          return gFalse;
++        }
+         j = dctZigZag[i++];
+       }
+       ++k;
 --- xpdf/Stream.h.orig 2010-05-18 11:22:18.000000000 -0700
 +++ xpdf/Stream.h      2010-05-18 11:22:18.000000000 -0700
 @@ -41,7 +41,8 @@