Commit cf4c7f2 for gzip

commit cf4c7f2d69abc58a2912de19dd17d2f096f80bd0
Author: Paul Eggert <eggert@cs.ucla.edu>
Date:   Thu Nov 12 18:23:07 2026 -0800

    gzip: ignore -DSMALL_MEM, -DMEDIUM_MEM

    This continues the cleanout of old 16-bit code.
    There is no reason to limit these array sizes nowadays.
    * deflate.c (window_size): Now const.  It was actually const
    before, despite its comment, which is now removed.

diff --git a/deflate.c b/deflate.c
index 5db492d..ef51e1c 100644
--- a/deflate.c
+++ b/deflate.c
@@ -84,20 +84,6 @@
  * Configuration parameters
  */

-/* Compile with MEDIUM_MEM to reduce the memory requirements or
- * with SMALL_MEM to use as little memory as possible. Use BIG_MEM if the
- * entire input file can be held in memory (not possible on 16 bit systems).
- * Warning: defining these symbols affects HASH_BITS (see below) and thus
- * affects the compression ratio. The compressed output
- * is still correct, and might even be smaller in some cases.
- */
-
-#ifdef SMALL_MEM
-#   define HASH_BITS  13  /* Number of bits used to hash strings */
-#endif
-#ifdef MEDIUM_MEM
-#   define HASH_BITS  14
-#endif
 #ifndef HASH_BITS
 #   define HASH_BITS  15
    /* For portability to 16 bit machines, do not use values above 15. */
@@ -151,8 +137,6 @@ typedef unsigned IPos;
  * WSIZE-MAX_MATCH bytes, but this ensures that IO is always
  * performed with a length multiple of the block size. Also, it limits
  * the window size to 64K, which is quite useful on MSDOS.
- * To do: limit the window size to WSIZE+BSZ if SMALL_MEM (the code would
- * be less efficient).
  */

 /* DECLARE(Pos, prev, WSIZE); */
@@ -164,9 +148,8 @@ typedef unsigned IPos;
 /* DECLARE(Pos, head, 1<<HASH_BITS); */
 /* Heads of the hash chains or NIL. */

-static ulg window_size = (ulg)2*WSIZE;
-/* window size, 2*WSIZE except for MMAP or BIG_MEM, where it is the
- * input file length plus MIN_LOOKAHEAD.
+static ulg const window_size = 2 * WSIZE;
+/* window size, always 2*WSIZE.
  */

 long block_start;
@@ -540,8 +523,6 @@ fill_window ()
         /* By the IN assertion, the window is not empty so we can't confuse
          * more == 0 with more == 64K on a 16 bit machine.
          */
-        Assert(window_size == (ulg)2*WSIZE, "no sliding with BIG_MEM");
-
         memcpy((char*)window, (char*)window+WSIZE, (unsigned)WSIZE);
         match_start -= WSIZE;
         strstart    -= WSIZE; /* we now have strstart >= MAX_DIST: */
diff --git a/gzip.h b/gzip.h
index fd497e6..5d15594 100644
--- a/gzip.h
+++ b/gzip.h
@@ -70,29 +70,17 @@ extern int method;         /* compression method */
  */

 #ifndef INBUFSIZ
-#  ifdef SMALL_MEM
-#    define INBUFSIZ  0x2000  /* input buffer size */
-#  else
 #    define INBUFSIZ  0x40000 /* input buffer size */
-#  endif
 #endif
 #define INBUF_EXTRA  64     /* required by unlzw() */

 #ifndef OUTBUFSIZ
-#  ifdef SMALL_MEM
-#    define OUTBUFSIZ   8192  /* output buffer size */
-#  else
 #    define OUTBUFSIZ 0x40000 /* output buffer size */
-#  endif
 #endif
 #define OUTBUF_EXTRA 2048   /* required by unlzw() */

 #ifndef DIST_BUFSIZE
-#  ifdef SMALL_MEM
-#    define DIST_BUFSIZE 0x2000 /* buffer for distances, see trees.c */
-#  else
 #    define DIST_BUFSIZE 0x8000 /* buffer for distances, see trees.c */
-#  endif
 #endif

 #define EXTERN(type, array)  extern type array[]
diff --git a/trees.c b/trees.c
index 10c79a8..9c27a0e 100644
--- a/trees.c
+++ b/trees.c
@@ -116,15 +116,7 @@ static int extra_blbits[BL_CODES]    /* extra bits for each bit length code */
 /* The three kinds of block type */

 #ifndef LIT_BUFSIZE
-#  ifdef SMALL_MEM
-#    define LIT_BUFSIZE  0x2000
-#  else
-#  ifdef MEDIUM_MEM
-#    define LIT_BUFSIZE  0x4000
-#  else
 #    define LIT_BUFSIZE  0x8000
-#  endif
-#  endif
 #endif
 #ifndef DIST_BUFSIZE
 #  define DIST_BUFSIZE  LIT_BUFSIZE