1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141

// Copyright 2015, Igor Shaula
// Licensed under the MIT License <LICENSE or
// http://opensource.org/licenses/MIT>. This file
// may not be copied, modified, or distributed
// except according to those terms.

//! Traits for loading/saving Registry values
use std::slice;
use std::io;
use std::ffi::{OsStr,OsString};
use std::os::windows::ffi::{OsStrExt,OsStringExt};
use super::winapi::shared::winerror;
use super::{RegValue};
use super::enums::*;
use super::{to_utf16,v16_to_v8};

/// A trait for types that can be loaded from registry values.
///
/// **NOTE:** Uses `from_utf16_lossy` when converting to `String`.
///
/// **NOTE:** When converting to `String`, trailing `NULL` characters are trimmed
/// and line separating `NULL` characters in `REG_MULTI_SZ` are replaced by `\n`.
/// When converting to `OsString`, all `NULL` characters are left as is.
pub trait FromRegValue : Sized {
    fn from_reg_value(val: &RegValue) -> io::Result<Self>;
}

impl FromRegValue for String {
    fn from_reg_value(val: &RegValue) -> io::Result<String> {
        match val.vtype {
            REG_SZ | REG_EXPAND_SZ | REG_MULTI_SZ => {
                let words = unsafe {
                    slice::from_raw_parts(val.bytes.as_ptr() as *const u16, val.bytes.len() / 2)
                };
                let mut s = String::from_utf16_lossy(words);
                while s.ends_with('\u{0}') {s.pop();}
                if val.vtype == REG_MULTI_SZ {
                    return Ok(s.replace("\u{0}", "\n"))
                }
                Ok(s)
            },
            _ => werr!(winerror::ERROR_BAD_FILE_TYPE)
        }
    }
}

impl FromRegValue for OsString {
    fn from_reg_value(val: &RegValue) -> io::Result<OsString> {
        match val.vtype {
            REG_SZ | REG_EXPAND_SZ | REG_MULTI_SZ => {
                let words = unsafe {
                    slice::from_raw_parts(val.bytes.as_ptr() as *const u16, val.bytes.len() / 2)
                };
                let s = OsString::from_wide(words);
                Ok(s)
            },
            _ => werr!(winerror::ERROR_BAD_FILE_TYPE)
        }
    }
}

impl FromRegValue for u32 {
    fn from_reg_value(val: &RegValue) -> io::Result<u32> {
        match val.vtype {
            REG_DWORD => {
                Ok(unsafe{ *(val.bytes.as_ptr() as *const u32) })
            },
            _ => werr!(winerror::ERROR_BAD_FILE_TYPE)
        }
    }
}

impl FromRegValue for u64 {
    fn from_reg_value(val: &RegValue) -> io::Result<u64> {
        match val.vtype {
            REG_QWORD => {
                Ok(unsafe{ *(val.bytes.as_ptr() as *const u64) })
            },
            _ => werr!(winerror::ERROR_BAD_FILE_TYPE)
        }
    }
}

/// A trait for types that can be written into registry values.
///
/// **NOTE:** Adds trailing `NULL` character to `str` and `String` values
/// but **not** to `OsStr` values.
pub trait ToRegValue {
    fn to_reg_value(&self) -> RegValue;
}

impl ToRegValue for String {
    fn to_reg_value(&self) -> RegValue {
        RegValue{
            bytes: v16_to_v8(&to_utf16(self)),
            vtype: REG_SZ
        }
    }
}

impl<'a> ToRegValue for &'a str {
    fn to_reg_value(&self) -> RegValue {
        RegValue{
            bytes: v16_to_v8(&to_utf16(self)),
            vtype: REG_SZ
        }
    }
}

impl<'a> ToRegValue for &'a OsStr {
    fn to_reg_value(&self) -> RegValue {
        RegValue{
            bytes: v16_to_v8(&(self.encode_wide().collect::<Vec<_>>())),
            vtype: REG_SZ
        }
    }
}

impl ToRegValue for u32 {
    fn to_reg_value(&self) -> RegValue {
        let bytes: Vec<u8> = unsafe {
            slice::from_raw_parts((self as *const u32) as *const u8, 4).to_vec()
        };
        RegValue{
            bytes: bytes,
            vtype: REG_DWORD
        }
    }
}

impl ToRegValue for u64 {
    fn to_reg_value(&self) -> RegValue {
        let bytes: Vec<u8> = unsafe {
            slice::from_raw_parts((self as *const u64) as *const u8, 8).to_vec()
        };
        RegValue{
            bytes: bytes,
            vtype: REG_QWORD
        }
    }
}