From cb81ec6f9eb7d6544adac5f4acb463b868482d10 Mon Sep 17 00:00:00 2001
From: drfrugal <drfrugal@karazhan>
Date: Fri, 7 Mar 2025 22:13:13 +0100
Subject: creating README.md for each crate separately, for crates.io

---
 Cargo.lock     | 516 ++++++++++++++++++++++++++++-----------------------------
 cli/README.md  |  34 ++++
 lib/Cargo.toml |   2 +-
 lib/README.md  |  25 +++
 4 files changed, 318 insertions(+), 259 deletions(-)
 create mode 100644 cli/README.md
 create mode 100644 lib/README.md

diff --git a/Cargo.lock b/Cargo.lock
index fcccb58..e319f60 100644
--- a/Cargo.lock
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diff --git a/cli/README.md b/cli/README.md
new file mode 100644
index 0000000..046e697
--- /dev/null
+++ b/cli/README.md
@@ -0,0 +1,34 @@
+# zlib-header-cli
+CLI to print details about the 2 Byte zlib header, as defined in
+[RFC 1950](https://datatracker.ietf.org/doc/html/rfc1950).  
+This was initially written to reverse-engineer more details about Blizzard's proprietary MPQ archive format, which uses
+zlib streams to store data.  
+```
+Usage: zlib-header-cli [OPTIONS] [HEX4CHAR]
+
+Arguments:
+[HEX4CHAR]  A four-character hex string representing the ZlibHeader (Big Endian)
+
+Options:
+  -e, --explain  Explain the ZlibHeader struct and abbreviations
+  -h, --help     Print help
+```
+```
+drfrugal@karazhan:~$ zlib-header-cli 789C
+CM      8 (DEFLATE)
+CINFO   7 (Window: 32768 Bytes)
+FCHECK  28 (valid)
+FDICT   false (Preset Dictionary not used)
+FLEVEL  2 (default)
+```
+```
+drfrugal@karazhan:~$ zlib-header-cli --explain
+2 Byte zlib header according to https://datatracker.ietf.org/doc/html/rfc1950
+1st Byte - CMF (Compression Method and Flags)
+  0000_1111  CM      Compression Method   8, _ (DEFLATE, UNDEFINED)
+  1111_0000  CINFO   Compression Info     window size is 2.pow(CINFO + 8)
+2nd Byte - FLG (Flags)
+  0001_1111  FCHECK  Checksum Adjustment  valid if (CMF * 256 + FLG) % 31 == 0
+  0010_0000  FDICT   Preset Dictionary    a preset dictionary was used
+  1100_0000  FLEVEL  Compression Level    0, 1, 2, 3 (fastest, fast, default, best)
+```
diff --git a/lib/Cargo.toml b/lib/Cargo.toml
index a5e8c54..e364f9b 100644
--- a/lib/Cargo.toml
+++ b/lib/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "zlib-header"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2024"
 description = "Library to work with the 2 Byte zlib header, as defined in RFC 1950."
 license = "MIT"
diff --git a/lib/README.md b/lib/README.md
new file mode 100644
index 0000000..cbd6355
--- /dev/null
+++ b/lib/README.md
@@ -0,0 +1,25 @@
+# zlib-header
+Library to work with the 2 Byte zlib header, as defined in [RFC 1950](https://datatracker.ietf.org/doc/html/rfc1950).
+## Examples
+```
+use zlib_header::ZlibHeader;
+let cm = 8;
+let cinfo = 7;
+let fdict = false;
+let flevel = 2;
+let header = ZlibHeader::new(cm, cinfo, fdict, flevel);
+match header {
+  Ok(header) => {
+    println!("header is valid (strict): {}", header.is_valid_strict()); // header is valid (strict): true 
+  },
+  Err(err) => eprintln!("Unable to initialize zlib header: {:?}", err)
+}
+```
+```
+use zlib_header::ZlibHeader;
+let header = ZlibHeader::default();
+println!("Display: {}", header); // Display: 789C
+println!("Debug: {:?}", header); // Debug: ZlibHeader { DEFLATE | 32768 Bytes | default | Dictionary: false | valid }
+let bytes = [0x78, 0x9C];
+println!("header matches expected bytes: {}", header == bytes); // header matches expected bytes: true
+```
-- 
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