First part of chapter 7

diff --git a/ch7-file-and-storage/Cargo.lock b/ch7-file-and-storage/Cargo.lock
new file mode 100644 (file)
index 0000000..21b858a
--- /dev/null
+++ b/ch7-file-and-storage/Cargo.lock
@@ -0,0 +1,114 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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+
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+ "serde",
+]
+
+[[package]]
+name = "ch7-file-and-storage"
+version = "0.1.0"
+dependencies = [
+ "bincode",
+ "serde",
+ "serde_cbor",
+ "serde_derive",
+ "serde_json",
+]
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+ "syn",
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diff --git a/ch7-file-and-storage/Cargo.toml b/ch7-file-and-storage/Cargo.toml
new file mode 100644 (file)
index 0000000..1cbb580
--- /dev/null
+++ b/ch7-file-and-storage/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "ch7-file-and-storage"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bincode = "1"
+serde = "1"
+serde_cbor = "0.11"
+serde_derive = "1"
+serde_json = "1"
\ No newline at end of file

diff --git a/ch7-file-and-storage/src/fview.rs b/ch7-file-and-storage/src/fview.rs
new file mode 100644 (file)
index 0000000..2f18dc4
--- /dev/null
+++ b/ch7-file-and-storage/src/fview.rs
@@ -0,0 +1,29 @@
+use std::fs::File;
+use std::io::prelude::*;
+use std::env;
+
+const BYTES_PER_LINE: usize = 16;
+
+pub fn run() {
+
+    let arg1 = env::args().nth(1);
+    let fname = arg1.expect("Usage: fview FILENAME");
+
+    let mut f = File::open(&fname).expect("Unable to open file.");
+    let mut pos = 0;
+    let mut buffer = [0; BYTES_PER_LINE];
+
+    while let Ok(_) = f.read_exact(&mut buffer) {
+        print!("[0x{:08x}] ", pos);
+        for byte in &buffer {
+            match *byte {
+                0x00 => print!(".  "),
+                0xff => print!("## "),
+                _ => print!("{:02x} ", byte),
+            }
+        }
+
+        println!("");
+        pos += BYTES_PER_LINE;
+    }
+}
\ No newline at end of file

diff --git a/ch7-file-and-storage/src/main.rs b/ch7-file-and-storage/src/main.rs
new file mode 100644 (file)
index 0000000..af9214d
--- /dev/null
+++ b/ch7-file-and-storage/src/main.rs
@@ -0,0 +1,18 @@
+use std::fs::File;
+use std::fs::OpenOptions;
+use std::io::prelude::*;
+
+mod serde;
+mod fview;
+
+fn main() {
+    //serde::run();
+    //fview::run();
+
+    let mut f = OpenOptions::new().read(true).write(true).create(true).open("test.txt").expect("File can't be opened");
+    let mut content = String::new();
+    match f.read_to_string(&mut content) {
+        Ok(bytes_read) => println!("File content: \"{}\", bytes read: {}", content, bytes_read),
+        Err(err) => println!("Can't read file: {}", err),
+    }
+}

diff --git a/ch7-file-and-storage/src/serde.rs b/ch7-file-and-storage/src/serde.rs
new file mode 100644 (file)
index 0000000..663958b
--- /dev/null
+++ b/ch7-file-and-storage/src/serde.rs
@@ -0,0 +1,33 @@
+use bincode::serialize as to_bincode;
+use serde_cbor::to_vec as to_cbor;
+use serde_json::to_string as to_json;
+use serde_derive::Serialize;
+
+#[derive(Serialize)]
+struct City {
+    name: String,
+    population: usize,
+    latitude: f64,
+    longitude: f64,
+}
+
+pub fn run() {
+    let calabar = City {
+        name: String::from("Calabar"),
+        population: 470_000,
+        latitude: 4.95,
+        longitude: 8.33,
+    };
+
+    let as_json = to_json(&calabar).unwrap();
+    let as_cbor = to_cbor(&calabar).unwrap();
+    let as_bincode = to_bincode(&calabar).unwrap();
+
+    println!("json:\n{}\n", &as_json);
+    println!("cbor:\n{:?}\n", &as_cbor);
+    println!("bincode:\n{:?}\n", &as_bincode);
+
+    println!("json (as UTF8):\n{}\n", String::from_utf8_lossy(as_json.as_bytes()));
+    println!("cbor (as UTF8):\n{:?}\n", String::from_utf8_lossy(&as_cbor));
+    println!("bincode (as UTF8):\n{:?}\n", String::from_utf8_lossy(&as_bincode));
+}
\ No newline at end of file