example/mzcat: support zlib
diff --git a/example/mzcat/mzcat.c b/example/mzcat/mzcat.c
index 3f7a900..3229f77 100644
--- a/example/mzcat/mzcat.c
+++ b/example/mzcat/mzcat.c
@@ -25,6 +25,7 @@
 - gzip
 - lzma
 - xz
+- zlib
 */
 
 #include <errno.h>
@@ -56,6 +57,7 @@
 // modules we use makes that process explicit. Preprocessing means that such
 // code simply isn't compiled.
 #define WUFFS_CONFIG__MODULES
+#define WUFFS_CONFIG__MODULE__ADLER32
 #define WUFFS_CONFIG__MODULE__BASE
 #define WUFFS_CONFIG__MODULE__BZIP2
 #define WUFFS_CONFIG__MODULE__CRC32
@@ -65,6 +67,7 @@
 #define WUFFS_CONFIG__MODULE__LZMA
 #define WUFFS_CONFIG__MODULE__SHA256
 #define WUFFS_CONFIG__MODULE__XZ
+#define WUFFS_CONFIG__MODULE__ZLIB
 
 // If building this program in an environment that doesn't easily accommodate
 // relative includes, you can use the script/inline-c-relative-includes.go
@@ -106,6 +109,7 @@
   wuffs_gzip__decoder gzip;
   wuffs_lzma__decoder lzma;
   wuffs_xz__decoder xz;
+  wuffs_zlib__decoder zlib;
 } g_potential_decoders;
 
 // ----
@@ -196,6 +200,15 @@
               &g_potential_decoders.lzma);
       break;
 
+    case 0x78:
+      status = wuffs_zlib__decoder__initialize(
+          &g_potential_decoders.zlib, sizeof g_potential_decoders.zlib,
+          WUFFS_VERSION, WUFFS_INITIALIZE__DEFAULT_OPTIONS);
+      io_transformer =
+          wuffs_zlib__decoder__upcast_as__wuffs_base__io_transformer(
+              &g_potential_decoders.zlib);
+      break;
+
     case 0xFD:
       status = wuffs_xz__decoder__initialize(
           &g_potential_decoders.xz, sizeof g_potential_decoders.xz,
diff --git a/test/mzcat-checksums-of-data.txt b/test/mzcat-checksums-of-data.txt
index cf0a0ff..7c917cc 100644
--- a/test/mzcat-checksums-of-data.txt
+++ b/test/mzcat-checksums-of-data.txt
@@ -1,6 +1,7 @@
 # Generated by script/print-mzcat-checksums.sh
 OK. 29058c73 test/data/256.bytes.bz2
 OK. 29058c73 test/data/256.bytes.gz
+OK. 2b581525 test/data/DCI-P3-D65.icc.zlib
 OK. 6ddef9db test/data/abraca.txt.bz2
 OK. b19df306 test/data/archive.tar.bz2
 OK. b19df306 test/data/archive.tar.gz
@@ -10,11 +11,14 @@
 OK. acef87f1 test/data/enwik5.xz
 OK. 3db2cdc6 test/data/midsummer.txt.bz2
 OK. 3db2cdc6 test/data/midsummer.txt.gz
+OK. 3db2cdc6 test/data/midsummer.txt.zlib
 OK. 519e8b87 test/data/pi.txt.bz2
 OK. 519e8b87 test/data/pi.txt.gz
+OK. 519e8b87 test/data/pi.txt.zlib
 OK. abe507ef test/data/romeo.txt.bz2
 OK. abe507ef test/data/romeo.txt.delta1.xz
 OK. abe507ef test/data/romeo.txt.gz
 OK. abe507ef test/data/romeo.txt.litonlylzma
 OK. abe507ef test/data/romeo.txt.lzma
 OK. abe507ef test/data/romeo.txt.xz
+OK. abe507ef test/data/romeo.txt.zlib