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diff --git a/deflate.c b/deflate.c
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index 1ec7614..b724c8d 100644
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--- a/deflate.c
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+++ b/deflate.c
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@@ -1233,15 +1233,16 @@ local void lm_init (s)
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/* For 80x86 and 680x0, an optimized version will be provided in match.asm or
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* match.S. The code will be functionally equivalent.
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*/
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-local uInt longest_match(s, cur_match)
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+local uInt longest_match(s, pcur_match)
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deflate_state *s;
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- IPos cur_match; /* current match */
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+ IPos pcur_match; /* current match */
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{
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+ ptrdiff_t cur_match = pcur_match; /* extend to pointer width */
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unsigned chain_length = s->max_chain_length;/* max hash chain length */
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register Bytef *scan = s->window + s->strstart; /* current string */
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register Bytef *match; /* matched string */
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register int len; /* length of current match */
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- int best_len = (int)s->prev_length; /* best match length so far */
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+ ptrdiff_t best_len = s->prev_length; /* best match length so far */
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int nice_match = s->nice_match; /* stop if match long enough */
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IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
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s->strstart - (IPos)MAX_DIST(s) : NIL;
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@@ -1256,12 +1257,12 @@ local uInt longest_match(s, cur_match)
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* Try with and without -DUNALIGNED_OK to check.
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*/
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register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1;
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- register ush scan_start = *(ushf*)scan;
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- register ush scan_end = *(ushf*)(scan+best_len-1);
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+ register uInt scan_start = *(ushf*)scan;
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+ register uInt scan_end = *(ushf*)(scan+best_len-1);
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#else
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register Bytef *strend = s->window + s->strstart + MAX_MATCH;
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- register Byte scan_end1 = scan[best_len-1];
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- register Byte scan_end = scan[best_len];
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+ register uInt scan_end1 = scan[best_len-1];
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+ register uInt scan_end = scan[best_len];
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#endif
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/* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
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