Fixed compressBound calculation for quick deflate strategy. Worse case is 9 bits...

diff --git a/compress.c b/compress.c
index 5adcf653c202d5c9a705703a463edd9361788378..3c29ddea18dd11e25e3988921cdba4d1b79e48d2 100644 (file)
--- a/compress.c
+++ b/compress.c
@@ -75,5 +75,11 @@ int ZEXPORT PREFIX(compress)(unsigned char *dest, z_size_t *destLen, const unsig
    this function needs to be updated.
  */
 z_size_t ZEXPORT PREFIX(compressBound)(z_size_t sourceLen) {
+#ifdef X86_QUICK_STRATEGY
+    /* Quick deflate strategy worse case is 9 bits per literal, rounded to nearest byte,
+       plus the size of block & gzip headers and footers */
+    return sourceLen + ((sourceLen + 13 + 7) >> 3) + 18;
+#else
     return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + (sourceLen >> 25) + 13;
+#endif
 }