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