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use internal_prelude::v1::*;
#[cfg(any(feature="alloc", feature="std"))]
pub trait PackedStructDebug {
fn fmt_fields(&self, fmt: &mut Formatter) -> Result<(), FmtError>;
fn packed_struct_display_header() -> &'static str;
}
pub struct DebugBinaryByteSlice<'a> {
pub bits: &'a Range<usize>,
pub slice: &'a [u8]
}
impl<'a> fmt::Binary for DebugBinaryByteSlice<'a> {
fn fmt(&self, fmt: &mut Formatter) -> fmt::Result {
for i in self.bits.start..(self.bits.end + 1) {
let byte = i / 8;
let bit = i % 8;
let bit = 7 - bit;
let src_byte = self.slice[byte];
let src_bit = (src_byte & (1 << bit)) == (1 << bit);
let s = if src_bit { "1" } else { "0" };
try!(fmt.write_str(s));
}
Ok(())
}
}
pub struct DebugBitField<'a> {
pub name: Cow<'a, str>,
pub bits: Range<usize>,
pub display_value: Cow<'a, str>
}
pub fn packable_fmt_fields(f: &mut Formatter, packed_bytes: &[u8], fields: &[DebugBitField]) -> fmt::Result {
if fields.len() == 0 {
return Ok(());
}
let max_field_length_name = fields.iter().map(|x| x.name.len()).max().unwrap();
let max_bit_width = fields.iter().map(|x| x.bits.len()).max().unwrap();
if max_bit_width > 32 {
for field in fields {
try!(write!(f, "{name:>0$} | {base_value:?}\r\n",
max_field_length_name + 1,
base_value = field.display_value,
name = field.name
));
}
} else {
for field in fields {
let debug_binary = DebugBinaryByteSlice {
bits: &field.bits,
slice: packed_bytes
};
try!(write!(f, "{name:>0$} | bits {bits_start:>3}:{bits_end:<3} | 0b{binary_value:>0width_bits$b}{dummy:>0spaces$} | {base_value:?}\r\n",
max_field_length_name + 1,
base_value = field.display_value,
binary_value = debug_binary,
dummy = "",
bits_start = field.bits.start,
bits_end = field.bits.end,
width_bits = field.bits.len(),
spaces = (max_bit_width - field.bits.len()) as usize,
name = field.name
));
}
}
Ok(())
}
pub struct PackedStructDisplay<'a, P: 'a, B: 'a> {
pub packed_struct: &'a P,
pub packed_struct_packed: PhantomData<B>,
pub header: bool,
pub raw_decimal: bool,
pub raw_hex: bool,
pub raw_binary: bool,
pub fields: bool
}
impl<'a, P, B> PackedStructDisplay<'a, P, B> {
pub fn new(packed_struct: &'a P) -> Self {
PackedStructDisplay {
packed_struct: packed_struct,
packed_struct_packed: Default::default(),
header: true,
raw_decimal: true,
raw_hex: true,
raw_binary: true,
fields: true
}
}
}
use packing::{PackedStruct, PackedStructSlice};
impl<'a, P, B> fmt::Display for PackedStructDisplay<'a, P, B> where P: PackedStruct<B> + PackedStructSlice + PackedStructDebug {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
match self.packed_struct.pack_to_vec() {
Ok(packed) => {
let l = packed.len();
if self.header {
try!(f.write_str(P::packed_struct_display_header()));
try!(f.write_str("\r\n"));
try!(f.write_str("\r\n"));
}
if self.raw_decimal {
try!(f.write_str("Decimal\r\n"));
try!(f.write_str("["));
for i in 0..l {
try!(write!(f, "{}", packed[i]));
if (i + 1) != l {
try!(f.write_str(", "));
}
}
try!(f.write_str("]"));
try!(f.write_str("\r\n"));
try!(f.write_str("\r\n"));
}
if self.raw_hex {
try!(f.write_str("Hex\r\n"));
try!(f.write_str("["));
for i in 0..l {
try!(write!(f, "0x{:X}", packed[i]));
if (i + 1) != l {
try!(f.write_str(", "));
}
}
try!(f.write_str("]"));
try!(f.write_str("\r\n"));
try!(f.write_str("\r\n"));
}
if self.raw_binary {
try!(f.write_str("Binary\r\n"));
try!(f.write_str("["));
for i in 0..l {
try!(write!(f, "0b{:08b}", packed[i]));
if (i + 1) != l {
try!(f.write_str(", "));
}
}
try!(f.write_str("]"));
try!(f.write_str("\r\n"));
try!(f.write_str("\r\n"));
}
if self.fields {
try!(self.packed_struct.fmt_fields(f));
}
},
Err(e) => {
write!(f, "Error packing for display: {:?}", e)?;
}
}
Ok(())
}
}