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diff --git a/converter/other/pnmtops.c b/converter/other/pnmtops.c
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index 24dc7df..e393931 100644
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--- a/converter/other/pnmtops.c
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+++ b/converter/other/pnmtops.c
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@@ -1909,6 +1909,7 @@ convertPage(FILE * const ifP,
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/* The file stream which is the head of the filter chain; we write to
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this and filtered stuff comes out the other end.
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*/
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+ FILE * filterChainOfP;
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pnm_readpaminit(ifP, &inpam, PAM_STRUCT_SIZE(tuple_type));
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@@ -1951,7 +1952,11 @@ convertPage(FILE * const ifP,
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initOutputEncoder(&oe, inpam.width, bitsPerSample,
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rle, flate, ascii85, psFilter);
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- spawnFilters(stdout, &oe, &feedFileP, filterPidList);
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+ fflush(stdout);
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+ filterChainOfP = fdopen(dup(fileno(stdout)), "w");
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+ /* spawnFilters() closes this. See FILE MANAGEMENT above */
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+
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+ spawnFilters(filterChainOfP, &oe, &feedFileP, filterPidList);
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convertRaster(&inpam, bitsPerSample, psFilter, feedFileP);
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