indy-crypto 0.4.3-dev-67

This is the shared crypto library for Hyperledger Indy components.
Documentation 
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use libc::c_char;

use std::ffi::CStr;
use std::str::Utf8Error;
use std::ffi::CString;

pub struct CTypesUtils {}

impl CTypesUtils {
    pub fn c_str_to_string(cstr: *const c_char) -> Result<Option<String>, Utf8Error> {
        if cstr.is_null() {
            return Ok(None);
        }

        unsafe {
            match CStr::from_ptr(cstr).to_str() {
                Ok(str) => Ok(Some(str.to_string())),
                Err(err) => Err(err)
            }
        }
    }

    pub fn string_to_cstring(s: String) -> CString {
        CString::new(s).unwrap()
    }
}

macro_rules! check_useful_c_byte_array {
    ($ptr:ident, $len:expr, $err1:expr, $err2:expr) => {
        if $ptr.is_null() {
            return $err1
        }

        if $len <= 0 {
            return $err2
        }

        let $ptr = unsafe { slice::from_raw_parts($ptr, $len) };
    }
}

macro_rules! check_useful_opt_c_byte_array {
    ($ptr:ident, $len:expr, $err1:expr, $err2:expr) => {
        if !$ptr.is_null() && $len <= 0 {
            return $err2
        }

        let $ptr = if $ptr.is_null() {
            None
        } else {
            unsafe { Some(slice::from_raw_parts($ptr, $len)) }
        };
    }
}

macro_rules! check_useful_c_reference {
    ($ptr:ident, $type:ty, $err:expr) => {
        if $ptr.is_null() {
            return $err
        }

        let $ptr: &$type = unsafe { &*($ptr as *const $type) };;
    }
}

macro_rules! check_useful_mut_c_reference {
    ($ptr:ident, $type:ty, $err:expr) => {
        if $ptr.is_null() {
            return $err
        }

        let $ptr: &mut $type = unsafe { &mut *($ptr as *mut $type) };;
    }
}

macro_rules! check_useful_opt_c_reference {
    ($ptr:ident, $type:ty) => {
        let $ptr: Option<&$type> = if $ptr.is_null() {
            None
        } else {
            Some(unsafe { & *($ptr as *const $type) })
        };
    }
}

macro_rules! check_useful_c_reference_array {
    ($ptrs:ident, $ptrs_len:ident, $type:ty, $err1:expr, $err2:expr) => {
        if $ptrs.is_null() {
            return $err1
        }

        if $ptrs_len <= 0 {
            return $err2
        }

        let $ptrs: Vec<&$type> =
            unsafe { slice::from_raw_parts($ptrs, $ptrs_len) }
                .iter()
                .map(|ptr| unsafe { &*(*ptr as *const $type) })
                .collect();
    }
}

macro_rules! check_useful_hashset {
    ($ptr:ident, $len:expr, $err1:expr, $err2:expr) => {
        if $ptr.is_null() {
            return $err1
        }

        let $ptr = HashSet::from_iter( unsafe {  slice::from_raw_parts($ptr, $len) }.iter().cloned());
    }
}

macro_rules! check_useful_c_ptr {
    ($ptr:ident, $err1:expr) => {
        if $ptr.is_null() {
            return $err1
        }
    }
}

macro_rules! check_useful_c_str {
    ($x:ident, $e:expr) => {
        let $x = match CTypesUtils::c_str_to_string($x) {
            Ok(Some(val)) => val,
            _ => return $e,
        };

        if $x.is_empty() {
            return $e
        }
    }
}

macro_rules! check_useful_opt_c_str {
    ($x:ident, $e:expr) => {
        let $x = match CTypesUtils::c_str_to_string($x) {
            Ok(opt_val) => opt_val,
            Err(_) => return $e
        };
    }
}

macro_rules! check_useful_c_callback {
    ($x:ident, $e:expr) => {
        let $x = match $x {
            Some($x) => $x,
            None => return $e
        };
    }
}