mirror of
https://github.com/archlinuxarm/PKGBUILDs.git
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22 lines
876 B
Diff
22 lines
876 B
Diff
diff -Naur old/jchuff.c new/jchuff.c
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--- old/jchuff.c 2014-11-27 06:48:21.009442853 -1000
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+++ new/jchuff.c 2014-11-27 06:48:46.289700004 -1000
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@@ -391,7 +391,16 @@
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#endif
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-#define BUFSIZE (DCTSIZE2 * 2)
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+/* Although it is exceedingly rare, it is possible for a Huffman-encoded
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+ * coefficient block to be larger than the 128-byte unencoded block. For each
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+ * of the 64 coefficients, PUT_BITS is invoked twice, and each invocation can
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+ * theoretically store 16 bits (for a maximum of 2048 bits or 256 bytes per
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+ * encoded block.) If, for instance, one artificially sets the AC
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+ * coefficients to alternating values of 32767 and -32768 (using the JPEG
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+ * scanning order-- 1, 8, 16, etc.), then this will produce an encoded block
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+ * larger than 200 bytes.
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+ */
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+#define BUFSIZE (DCTSIZE2 * 4)
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#define LOAD_BUFFER() { \
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if (state->free_in_buffer < BUFSIZE) { \
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