From e74686a4793d413aecb5167f6057ed8b56d6ac9d Mon Sep 17 00:00:00 2001
From: Mark Allen <mrallen1@yahoo.com>
Date: Wed, 17 Jan 2018 22:52:48 -0600
Subject: Add zlib patch to kerl when building between 17-19

---
 kerl | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 93 insertions(+), 1 deletion(-)

diff --git a/kerl b/kerl
index 92729f4..c3fe8b7 100755
--- a/kerl
+++ b/kerl
@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (c) 2016 Mark Allen
+# Copyright (c) 2016-2018 Mark Allen
 # Copyright (c) 2011, 2012 Spawngrid, Inc
 # Copyright (c) 2011 Evax Software <contact(at)evax(dot)org>
 #
@@ -563,6 +563,11 @@ maybe_patch_all()
             fi
         fi
     fi
+
+    # Maybe apply zlib patch
+    if [ "$1" -ge 17 -a "$1" -le 19 ]; then
+        apply_zlib_patch >> "$LOGFILE"
+    fi
 }
 
 maybe_patch_darwin()
@@ -1844,6 +1849,93 @@ index cc9bcc995..1b1912630 100644
 _END_PATCH
 }
 
+# https://github.com/erlang/otp/commit/e27119948fc6ab28bea81019720bddaac5b655a7.patch
+apply_zlib_patch()
+{
+
+    patch -p1 <<'_END_PATCH'
+diff --git a/erts/emulator/beam/external.c b/erts/emulator/beam/external.c
+index 656de7c49ad..4491d486837 100644
+--- a/erts/emulator/beam/external.c
++++ b/erts/emulator/beam/external.c
+@@ -1193,6 +1193,7 @@ typedef struct B2TContext_t {
+     } u;
+ } B2TContext;
+ 
++static B2TContext* b2t_export_context(Process*, B2TContext* src);
+ 
+ static uLongf binary2term_uncomp_size(byte* data, Sint size)
+ {
+@@ -1225,7 +1226,7 @@ static uLongf binary2term_uncomp_size(byte* data, Sint size)
+ 
+ static ERTS_INLINE int
+ binary2term_prepare(ErtsBinary2TermState *state, byte *data, Sint data_size,
+-		    B2TContext* ctx)
++		    B2TContext** ctxp, Process* p)
+ {
+     byte *bytes = data;
+     Sint size = data_size;
+@@ -1239,8 +1240,8 @@ binary2term_prepare(ErtsBinary2TermState *state, byte *data, Sint data_size,
+     size--;
+     if (size < 5 || *bytes != COMPRESSED) {
+ 	state->extp = bytes;
+-        if (ctx)
+-	    ctx->state = B2TSizeInit;
++        if (ctxp)
++	    (*ctxp)->state = B2TSizeInit;
+     }
+     else  {
+ 	uLongf dest_len = (Uint32) get_int32(bytes+1);
+@@ -1257,16 +1258,26 @@ binary2term_prepare(ErtsBinary2TermState *state, byte *data, Sint data_size,
+                 return -1;
+ 	    }
+ 	    state->extp = erts_alloc(ERTS_ALC_T_EXT_TERM_DATA, dest_len);
+-            ctx->reds -= dest_len;
++            if (ctxp)
++                (*ctxp)->reds -= dest_len;
+ 	}
+ 	state->exttmp = 1;
+-        if (ctx) {
++        if (ctxp) {
++            /*
++             * Start decompression by exporting trap context
++             * so we don't have to deal with deep-copying z_stream.
++             */
++            B2TContext* ctx = b2t_export_context(p, *ctxp);
++            ASSERT(state = &(*ctxp)->b2ts);
++            state = &ctx->b2ts;
++
+ 	    if (erl_zlib_inflate_start(&ctx->u.uc.stream, bytes, size) != Z_OK)
+ 		return -1;
+ 
+ 	    ctx->u.uc.dbytes = state->extp;
+ 	    ctx->u.uc.dleft = dest_len;
+ 	    ctx->state = B2TUncompressChunk;
++            *ctxp = ctx;
+         }
+ 	else {
+ 	    uLongf dlen = dest_len;
+@@ -1308,7 +1319,7 @@ erts_binary2term_prepare(ErtsBinary2TermState *state, byte *data, Sint data_size
+ {
+     Sint res;
+ 
+-    if (binary2term_prepare(state, data, data_size, NULL) < 0 ||
++    if (binary2term_prepare(state, data, data_size, NULL, NULL) < 0 ||
+         (res=decoded_size(state->extp, state->extp + state->extsize, 0, NULL)) < 0) {
+ 
+         if (state->exttmp)
+@@ -1435,7 +1446,7 @@ static Eterm binary_to_term_int(Process* p, Uint32 flags, Eterm bin, Binary* con
+             if (ctx->aligned_alloc) {
+                 ctx->reds -= bin_size / 8;
+             }
+-            if (binary2term_prepare(&ctx->b2ts, bytes, bin_size, ctx) < 0) {
++            if (binary2term_prepare(&ctx->b2ts, bytes, bin_size, &ctx, p) < 0) {
+ 		ctx->state = B2TBadArg;
+ 	    }
+             break;
+_END_PATCH
+}
+
 case "$1" in
     version)
         echo "$KERL_VERSION"
-- 
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