Attachment 134916 Details for Bug 103174 – patch on LZW decompression fixing this issue

[patch] patch on LZW decompression fixing this issue

poppler-lzw.patch (text/plain), 1012 bytes, created by k.dohmann on 2017-10-19 09:18:54 UTC

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Creator: k.dohmann

Created: 2017-10-19 09:18:54 UTC

Size: 1012 bytes

patch

obsolete

>diff --git a/poppler-0.57.0/poppler/Stream.cc b/poppler-0.57.0/poppler/Stream.cc
>index 606902f..f78fa0a 100644
>--- a/poppler-0.57.0/poppler/Stream.cc
>+++ b/poppler-0.57.0/poppler/Stream.cc
>@@ -1414,11 +1414,6 @@ GBool LZWStream::processNextCode() {
>     clearTable();
>     goto start;
>   }
>-  if (nextCode >= 4097) {
>-    error(errSyntaxError, getPos(),
>-         "Bad LZW stream - expected clear-table code");
>-    clearTable();
>-  }
> 
>   // process the next code
>   nextLength = seqLength + 1;
>@@ -1444,10 +1439,12 @@ GBool LZWStream::processNextCode() {
>   if (first) {
>     first = gFalse;
>   } else {
>-    table[nextCode].length = nextLength;
>-    table[nextCode].head = prevCode;
>-    table[nextCode].tail = newChar;
>-    ++nextCode;
>+    if (nextCode<=4096) {
>+      table[nextCode].length = nextLength;
>+      table[nextCode].head = prevCode;
>+      table[nextCode].tail = newChar;
>+      ++nextCode;
>+    }
>     if (nextCode + early == 512)
>       nextBits = 10;
>     else if (nextCode + early == 1024)

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Attachments on bug 103174: 134880 | 134916 | 134970

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