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b8b43e |
--- a/compress.c
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b8b43e |
+++ b/compress.c
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b8b43e |
@@ -5,9 +5,15 @@
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b8b43e |
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b8b43e |
/* @(#) $Id$ */
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b8b43e |
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b8b43e |
-#define ZLIB_INTERNAL
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b8b43e |
+#include "zutil.h"
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b8b43e |
#include "zlib.h"
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b8b43e |
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b8b43e |
+#ifdef DFLTCC
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+# include "contrib/s390/dfltcc.h"
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b8b43e |
+#else
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b8b43e |
+#define DEFLATE_BOUND_COMPLEN(source_len) 0
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b8b43e |
+#endif
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b8b43e |
+
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b8b43e |
/* ===========================================================================
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b8b43e |
Compresses the source buffer into the destination buffer. The level
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parameter has the same meaning as in deflateInit. sourceLen is the byte
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b8b43e |
@@ -81,6 +87,12 @@ int ZEXPORT compress (dest, destLen, source, sourceLen)
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b8b43e |
uLong ZEXPORT compressBound (sourceLen)
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b8b43e |
uLong sourceLen;
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{
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b8b43e |
+ uLong complen = DEFLATE_BOUND_COMPLEN(sourceLen);
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b8b43e |
+
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b8b43e |
+ if (complen > 0)
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b8b43e |
+ /* Architecture-specific code provided an upper bound. */
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b8b43e |
+ return complen + ZLIB_WRAPLEN;
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b8b43e |
+
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b8b43e |
return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
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b8b43e |
(sourceLen >> 25) + 13;
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b8b43e |
}
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b8b43e |
--- a/contrib/s390/dfltcc.h
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b8b43e |
+++ b/contrib/s390/dfltcc.h
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b8b43e |
@@ -12,6 +12,28 @@ void ZLIB_INTERNAL dfltcc_reset OF((z_streamp strm, uInt size));
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b8b43e |
voidpf ZLIB_INTERNAL dfltcc_alloc_window OF((z_streamp strm, uInt items,
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b8b43e |
uInt size));
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b8b43e |
void ZLIB_INTERNAL dfltcc_free_window OF((z_streamp strm, voidpf w));
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b8b43e |
+#define DFLTCC_BLOCK_HEADER_BITS 3
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b8b43e |
+#define DFLTCC_HLITS_COUNT_BITS 5
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b8b43e |
+#define DFLTCC_HDISTS_COUNT_BITS 5
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b8b43e |
+#define DFLTCC_HCLENS_COUNT_BITS 4
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b8b43e |
+#define DFLTCC_MAX_HCLENS 19
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b8b43e |
+#define DFLTCC_HCLEN_BITS 3
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b8b43e |
+#define DFLTCC_MAX_HLITS 286
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b8b43e |
+#define DFLTCC_MAX_HDISTS 30
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b8b43e |
+#define DFLTCC_MAX_HLIT_HDIST_BITS 7
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b8b43e |
+#define DFLTCC_MAX_SYMBOL_BITS 16
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b8b43e |
+#define DFLTCC_MAX_EOBS_BITS 15
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b8b43e |
+#define DFLTCC_MAX_PADDING_BITS 7
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b8b43e |
+#define DEFLATE_BOUND_COMPLEN(source_len) \
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b8b43e |
+ ((DFLTCC_BLOCK_HEADER_BITS + \
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b8b43e |
+ DFLTCC_HLITS_COUNT_BITS + \
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b8b43e |
+ DFLTCC_HDISTS_COUNT_BITS + \
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b8b43e |
+ DFLTCC_HCLENS_COUNT_BITS + \
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b8b43e |
+ DFLTCC_MAX_HCLENS * DFLTCC_HCLEN_BITS + \
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b8b43e |
+ (DFLTCC_MAX_HLITS + DFLTCC_MAX_HDISTS) * DFLTCC_MAX_HLIT_HDIST_BITS + \
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b8b43e |
+ (source_len) * DFLTCC_MAX_SYMBOL_BITS + \
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b8b43e |
+ DFLTCC_MAX_EOBS_BITS + \
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b8b43e |
+ DFLTCC_MAX_PADDING_BITS) >> 3)
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b8b43e |
int ZLIB_INTERNAL dfltcc_can_inflate OF((z_streamp strm));
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b8b43e |
typedef enum {
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b8b43e |
DFLTCC_INFLATE_CONTINUE,
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b8b43e |
diff --git a/contrib/s390/dfltcc_deflate.h b/contrib/s390/dfltcc_deflate.h
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b8b43e |
index 03f7f53..46acfc5 100644
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b8b43e |
--- a/contrib/s390/dfltcc_deflate.h
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b8b43e |
+++ b/contrib/s390/dfltcc_deflate.h
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b8b43e |
@@ -46,8 +46,7 @@ int ZLIB_INTERNAL dfltcc_deflate_get_dictionary OF((z_streamp strm,
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b8b43e |
#define DEFLATE_BOUND_ADJUST_COMPLEN(strm, complen, source_len) \
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b8b43e |
do { \
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b8b43e |
if (dfltcc_can_deflate((strm))) \
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b8b43e |
- (complen) = (3 + 5 + 5 + 4 + 19 * 3 + (286 + 30) * 7 + \
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b8b43e |
- (source_len) * 16 + 15 + 7) >> 3; \
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b8b43e |
+ (complen) = DEFLATE_BOUND_COMPLEN(source_len); \
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b8b43e |
} while (0)
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b8b43e |
#define DEFLATE_NEED_CONSERVATIVE_BOUND(strm) (dfltcc_can_deflate((strm)))
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b8b43e |
#define DEFLATE_HOOK dfltcc_deflate
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b8b43e |
diff --git a/zutil.h b/zutil.h
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b8b43e |
index 14277bc..cf90e49 100644
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b8b43e |
--- a/zutil.h
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b8b43e |
+++ b/zutil.h
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b8b43e |
@@ -87,6 +87,8 @@ extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
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b8b43e |
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b8b43e |
#define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */
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b8b43e |
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b8b43e |
+#define ZLIB_WRAPLEN 6 /* zlib format overhead */
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b8b43e |
+
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b8b43e |
/* target dependencies */
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b8b43e |
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b8b43e |
#if defined(MSDOS) || (defined(WINDOWS) && !defined(WIN32))
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