Merge branch 'master' of D:\github\other\zz_urlencoder

Author: liigo

.cargo/config

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+[build]
+rustflags = ["-Ctarget-feature=+crt-static", "-Zunstable-options"]

.gitignore

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+target
+Cargo.lock

Cargo.toml

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+[package]
+authors = ["Liigo Zhuang <liigo@qq.com>"]
+name = "zz_urlencoder"
+version = "0.1.0"
+
+[dependencies]
+url = "1.4.0"
+
+[lib]
+crate-type = ["cdylib"]

src/lib.rs

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+extern crate url;
+
+use std::slice;
+use std::ptr;
+use url::form_urlencoded;
+
+/// 对input文本执行`application/x-www-form-urlencoded`编码，结果写入buf缓冲区
+///
+/// 参数input为UTF-8格式的文本数据地址，inputlen是其字节数
+/// 参数buf为结果缓冲区，buflen是其字节数
+///
+/// 如果缓冲区长度不足以存放编码结果文本，将返回实际所需缓冲区字节数的负值，保持缓冲区内容不变
+/// 如果缓冲区长度足够，将向其写入编码结果文本和结尾'\0'字符，并返回写入的字节数（正值）
+/// 
+/// by Liigo, 20170207.
+#[no_mangle]
+pub extern fn form_urlencode(input: i32, inputlen: i32, buf: i32, buflen: i32) -> i32 {
+    let utf8 = unsafe { 
+        slice::from_raw_parts_mut(input as *mut u8, inputlen as usize)
+    };
+
+    let ss: Vec<&str> = form_urlencoded::byte_serialize(utf8).collect();
+    let required_buflen = (ss.iter().map(|s| s.len()).sum::<usize>() + 1) as i32;
+
+    if buflen < required_buflen {
+        return 0 - required_buflen;
+    }
+    
+    let mut pbuf = buf as *mut u8;
+    for s in ss {
+        unsafe {
+            ptr::copy_nonoverlapping(s.as_ptr(), pbuf, s.len());
+            pbuf = pbuf.offset(s.len() as isize);
+        }
+    }
+    unsafe {
+        ptr::write(pbuf, 0); // write the ending '\0'
+    }
+    required_buflen
+}