311 lines
9.6 KiB
Rust
311 lines
9.6 KiB
Rust
use crate::byte_stream::{ByteStream, bit_mask, ByteStreamError};
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use serde::Deserialize;
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use std::fmt::{Write, Display, Formatter};
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use num_bigint::{BigUint, BigInt};
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use std::io::Cursor;
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use byteorder::{LittleEndian, ReadBytesExt};
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use std::string::FromUtf8Error;
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use crate::formatter::printers::print_bytes_as_array;
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#[derive(Debug, Clone)]
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pub enum FormatError {
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ByteSteamError(ByteStreamError),
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#[allow(dead_code)]
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NotSupported,
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StringParseError(FromUtf8Error),
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}
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impl From<ByteStreamError> for FormatError {
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fn from(e: ByteStreamError) -> Self {
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FormatError::ByteSteamError(e)
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}
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}
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impl From<FromUtf8Error> for FormatError {
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fn from(e: FromUtf8Error) -> Self {
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FormatError::StringParseError(e)
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}
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}
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impl Display for FormatError {
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fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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match self {
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FormatError::ByteSteamError(e) => writeln!(f, "Byte stream error: {}", e),
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FormatError::NotSupported => write!(f, "Field type not supported"),
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FormatError::StringParseError(e) => write!(f, "String parse error: {}", e)
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}
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}
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}
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#[derive(Debug, Deserialize, Clone)]
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#[serde(tag = "type")]
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pub enum FieldType {
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/// Unsigned Int
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UInt { bit_width: usize },
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/// Unsigned Int
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Int { bit_width: usize },
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/// Single Precession Float
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Float,
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/// Double Precession Float
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Double,
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/// Null Terminated String Field
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String { max_len: usize },
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/// Fixed Byte Length Field
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Bytes { max_len: usize },
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}
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#[derive(Debug, Deserialize, Clone)]
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pub struct Field {
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/// Field Name
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pub name: String,
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/// Field Type
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pub field_type: FieldType,
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}
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impl Field {
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fn format_int(byte_stream: &ByteStream, bit_ndx: usize, bit_width: usize) -> Result<(String, usize), FormatError> {
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let mut bytes = byte_stream.get_bytes(bit_ndx, bit_width)?;
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if let Some(last_byte) = bytes.last_mut() {
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let last_bit = ((bit_width - 1) % 8) as u8;
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let sign_bit = (*last_byte >> last_bit) & 0x1 == 1;
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if sign_bit {
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// Sign extend
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*last_byte |= !bit_mask(last_bit + 1)
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}
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let big_int = BigInt::from_signed_bytes_le(&bytes);
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Ok((big_int.to_string(), bit_width))
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}
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else {
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Err(ByteStreamError::OutOfRange.into())
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}
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}
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fn format_uint(byte_stream: &ByteStream, bit_ndx: usize, bit_width: usize) -> Result<(String, usize), FormatError> {
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let bytes = byte_stream.get_bytes(bit_ndx, bit_width)?;
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let big_int = BigUint::from_bytes_le(&bytes);
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Ok((big_int.to_string(), bit_width))
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}
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fn format_float(byte_stream: &ByteStream, bit_ndx: usize) -> Result<(String, usize), FormatError> {
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let bytes = byte_stream.get_bytes(bit_ndx, 32)?;
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let mut cursor = Cursor::new(bytes);
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Ok((cursor.read_f32::<LittleEndian>().unwrap().to_string(), 4))
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}
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fn format_double(byte_stream: &ByteStream, bit_ndx: usize) -> Result<(String, usize), FormatError> {
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let bytes = byte_stream.get_bytes(bit_ndx, 64)?;
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let mut cursor = Cursor::new(bytes);
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Ok((cursor.read_f64::<LittleEndian>().unwrap().to_string(), 4))
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}
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fn format_string(byte_stream: &ByteStream, mut bit_ndx: usize, max_byte_len: usize) -> Result<(String, usize), FormatError> {
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let mut string_bytes = Vec::new();
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for _ in 0..max_byte_len {
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let byte = byte_stream.get_bytes(bit_ndx, 8)?[0];
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if byte == 0 {
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break;
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}
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string_bytes.push(byte);
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bit_ndx += 8;
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}
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let byte_count = string_bytes.len();
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Ok((String::from_utf8(string_bytes)?, byte_count))
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}
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fn format_bytes(byte_stream: &ByteStream, bit_ndx: usize, max_byte_len: usize) -> Result<(String, usize), FormatError> {
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let data_remaining = byte_stream.len() - bit_ndx/8;
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let width = if max_byte_len < data_remaining {
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max_byte_len*8
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}
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else {
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data_remaining*8
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};
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let data = byte_stream.get_bytes(bit_ndx, width)?;
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Ok((print_bytes_as_array(&data), width))
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}
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fn format_data(&self, byte_stream: &ByteStream, bit_ndx: usize) -> Result<(String, usize), FormatError> {
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match self.field_type {
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FieldType::UInt { bit_width } => Self::format_uint(byte_stream, bit_ndx, bit_width),
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FieldType::Int { bit_width } => Self::format_int(byte_stream, bit_ndx, bit_width),
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FieldType::Float => Self::format_float(byte_stream, bit_ndx),
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FieldType::Double => Self::format_double(byte_stream, bit_ndx),
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FieldType::String {max_len} => Self::format_string(byte_stream, bit_ndx, max_len),
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FieldType::Bytes {max_len} => Self::format_bytes(byte_stream, bit_ndx, max_len)
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}
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}
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}
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#[derive(Debug, Deserialize, Clone)]
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pub struct Format {
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/// Format Name
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pub name: String,
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/// Elements of the format
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pub fields: Vec<Field>,
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}
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impl Format {
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pub fn format_data(&self, data: &[u8]) -> Result<String, FormatError> {
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let mut format_str = String::new();
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let byte_stream = ByteStream::from(data);
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let mut bit_ndx: usize = 0;
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for field in &self.fields {
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match field.format_data(&byte_stream, bit_ndx) {
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Ok((data_str, bit_width)) => {
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bit_ndx += bit_width;
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writeln!(format_str, "{}: {}", field.name, data_str).unwrap();
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}
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Err(e) => {
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println!("Error formatting field: \"{}\": {}", field.name, e);
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return Err(e);
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}
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}
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}
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Ok(format_str)
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}
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}
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#[cfg(test)]
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mod tests {
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use crate::formatter::format::{FieldType, Field};
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use crate::byte_stream::ByteStream;
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#[test]
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fn test_format_int_4_bits() {
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let field = Field {field_type: FieldType::Int {bit_width: 4,}, name: "test".to_string()};
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for i in 0i8..7i8 {
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let mut byte_vec = Vec::new();
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byte_vec.push(i as u8);
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byte_vec.push((-i) as u8);
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let byte_steam = ByteStream::from(byte_vec);
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let (pos_output, _) = field.format_data(&byte_steam, 0).unwrap();
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let (neg_output, _) = field.format_data(&byte_steam, 8).unwrap();
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assert_eq!(pos_output, i.to_string());
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assert_eq!(neg_output, (-i).to_string());
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}
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}
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#[test]
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fn test_format_int_5_bits() {
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let field = Field {field_type: FieldType::Int {bit_width: 5,}, name: "test".to_string()};
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let byte_steam = ByteStream::from(vec![0x1B]);
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let (output, _) = field.format_data(&byte_steam, 0).unwrap();
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assert_eq!(output, "-5")
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}
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#[test]
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fn test_format_int_16_bits() {
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let field = Field {field_type: FieldType::Int {bit_width: 16,}, name: "test".to_string()};
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let byte_steam = ByteStream::from(vec![0xFC, 0xA5]);
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let (output, _) = field.format_data(&byte_steam, 0).unwrap();
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assert_eq!(output, "-23044")
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}
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#[test]
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fn test_format_int_16_bits_not_aligned() {
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let field = Field {field_type: FieldType::Int {bit_width: 16,}, name: "test".to_string()};
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let byte_steam = ByteStream::from(vec![0xC0, 0x5F, 0x0A]);
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let (output, _) = field.format_data(&byte_steam, 4).unwrap();
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assert_eq!(output, "-23044")
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}
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#[test]
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fn test_format_float() {
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let field = Field {field_type: FieldType::Float, name: "test".to_string()};
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let byte_steam = ByteStream::from(b"\x52\x58\xd2\xc3".to_vec());
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let (output, _) = field.format_data(&byte_steam, 0).unwrap();
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assert_eq!(output, "-420.69")
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}
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#[test]
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fn test_format_double() {
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let field = Field {field_type: FieldType::Double, name: "test".to_string()};
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let byte_steam = ByteStream::from(b"\xD7\xA3\x70\x3D\x0A\x4B\x7A\xC0".to_vec());
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let (output, _) = field.format_data(&byte_steam, 0).unwrap();
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assert_eq!(output, "-420.69")
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}
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#[test]
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fn test_format_float_err() {
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let field = Field {field_type: FieldType::Double, name: "test".to_string()};
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let byte_steam = ByteStream::from(b"\x3D\x70\xA3\xD7".to_vec());
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assert!(field.format_data(&byte_steam, 0).is_err())
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}
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#[test]
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fn test_format_string() {
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let field = Field {field_type: FieldType::String {max_len: 16}, name: "test".to_string()};
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let byte_steam = ByteStream::from(b"Hello World!\0".to_vec());
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let (output, _) = field.format_data(&byte_steam, 0).unwrap();
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assert_eq!(output, "Hello World!".to_string())
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}
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#[test]
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fn test_format_bytes() {
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let field = Field {field_type: FieldType::Bytes {max_len: 2}, name: "test".to_string()};
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let byte_steam = ByteStream::from(vec![0xDE, 0xAD, 0xBE, 0xEF]);
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let (output, _) = field.format_data(&byte_steam, 0).unwrap();
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assert_eq!(output, "[222, 173]")
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}
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#[test]
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fn test_format_bytes_max_len_bigger_than_data() {
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let field = Field {field_type: FieldType::Bytes {max_len: 64}, name: "test".to_string()};
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let byte_steam = ByteStream::from(vec![0xDE, 0xAD]);
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let (output, _) = field.format_data(&byte_steam, 0).unwrap();
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assert_eq!(output, "[222, 173]")
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}
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#[test]
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fn test_ccsds_apid_issue() {
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let field = Field {field_type: FieldType::UInt {bit_width: 11}, name: "test".to_string()};
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let byte_steam = ByteStream::from(vec![0xe0, 0xa1, 0xc0, 0x00, 0x05, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05]);
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let (output, _) = field.format_data(&byte_steam, 5).unwrap();
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assert_eq!(output, "1295")
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}
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}
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