From e9e50fe2c6ebef9df7d5884afe2092c3fb12cb08 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Wed, 17 Dec 2025 16:09:12 +0000
Subject: [PATCH 1/2] Avoid pre-decrement of pointer in big-endian CRC
 calculation.

---
 .../Demonstrations/Watermark/lib/zlib-1.2.8/crc32.c           | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/Projects/32L4P5GDISCOVERY/Demonstrations/Watermark/lib/zlib-1.2.8/crc32.c b/Projects/32L4P5GDISCOVERY/Demonstrations/Watermark/lib/zlib-1.2.8/crc32.c
index 730565e88..5ac41a21a 100644
--- a/Projects/32L4P5GDISCOVERY/Demonstrations/Watermark/lib/zlib-1.2.8/crc32.c
+++ b/Projects/32L4P5GDISCOVERY/Demonstrations/Watermark/lib/zlib-1.2.8/crc32.c
@@ -285,7 +285,7 @@ local unsigned long crc32_little(crc, buf, len)
 }
 
 /* ========================================================================= */
-#define DOBIG4 c ^= *++buf4; \
+#define DOBIG4 c ^= *buf4++; \
         c = crc_table[4][c & 0xff] ^ crc_table[5][(c >> 8) & 0xff] ^ \
             crc_table[6][(c >> 16) & 0xff] ^ crc_table[7][c >> 24]
 #define DOBIG32 DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4
@@ -307,7 +307,6 @@ local unsigned long crc32_big(crc, buf, len)
     }
 
     buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
-    buf4--;
     while (len >= 32) {
         DOBIG32;
         len -= 32;
@@ -316,7 +315,6 @@ local unsigned long crc32_big(crc, buf, len)
         DOBIG4;
         len -= 4;
     }
-    buf4++;
     buf = (const unsigned char FAR *)buf4;
 
     if (len) do {

From 3fe27c6ab2aad56a4008526be06a0cb28c3758d4 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Wed, 17 Dec 2025 16:24:53 +0000
Subject: [PATCH 2/2] Remove offset pointer optimization in inftrees.c.

---
 .../Watermark/lib/zlib-1.2.8/inftrees.c       | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/Projects/32L4P5GDISCOVERY/Demonstrations/Watermark/lib/zlib-1.2.8/inftrees.c b/Projects/32L4P5GDISCOVERY/Demonstrations/Watermark/lib/zlib-1.2.8/inftrees.c
index ec4b4ce67..c4fee9f6b 100644
--- a/Projects/32L4P5GDISCOVERY/Demonstrations/Watermark/lib/zlib-1.2.8/inftrees.c
+++ b/Projects/32L4P5GDISCOVERY/Demonstrations/Watermark/lib/zlib-1.2.8/inftrees.c
@@ -58,7 +58,7 @@ int ZLIB_INTERNAL inflate_table(codetype type, unsigned short FAR *lens, unsigne
     code FAR *next;             /* next available space in table */
     const unsigned short FAR *base;     /* base value table to use */
     const unsigned short FAR *extra;    /* extra bits table to use */
-    int end;                    /* use base and extra for symbol > end */
+    unsigned match;             /* use base and extra for symbol >= match */
     unsigned short count[MAXBITS+1];    /* number of codes of each length */
     unsigned short offs[MAXBITS+1];     /* offsets in table for each length */
     static const unsigned short lbase[31] = { /* Length codes 257..285 base */
@@ -185,19 +185,17 @@ int ZLIB_INTERNAL inflate_table(codetype type, unsigned short FAR *lens, unsigne
     switch (type) {
     case CODES:
         base = extra = work;    /* dummy value--not used */
-        end = 19;
+        match = 20;
         break;
     case LENS:
         base = lbase;
-        base -= 257;
         extra = lext;
-        extra -= 257;
-        end = 256;
+        match = 257;
         break;
     default:            /* DISTS */
         base = dbase;
         extra = dext;
-        end = -1;
+        match = 0;
     }
 
     /* initialize state for loop */
@@ -220,14 +218,13 @@ int ZLIB_INTERNAL inflate_table(codetype type, unsigned short FAR *lens, unsigne
     for (;;) {
         /* create table entry */
         here.bits = (unsigned char)(len - drop);
-        if ((int)(work[sym]) < end) {
+        if (work[sym] + 1 < match) {
             here.op = (unsigned char)0;
             here.val = work[sym];
         }
-        else if ((int)(work[sym]) > end) {
-            here.op = (unsigned char)(extra[work[sym]]);
-            here.val = base[work[sym]];
-        }
+        else if (work[sym] >= match) {
+            here.op = (unsigned char)(extra[work[sym] - match]);
+            here.val = base[work[sym] - match];
         else {
             here.op = (unsigned char)(32 + 64);         /* end of block */
             here.val = 0;