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//! Primitive type parsers (unsigned, signed, float, complex)
use super::helpers::{decode_isize, decode_usize};
use crate::types::VsfType;
use num_complex::Complex;
use std::io::{Error, ErrorKind};
// ==================== UNSIGNED INTEGERS ====================
pub fn parse_unsigned(data: &[u8], pointer: &mut usize) -> Result<VsfType, Error> {
if *pointer >= data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for unsigned size marker",
));
}
let size_byte = data[*pointer];
// Special case: u0 (boolean) has no size marker '0', just the value directly
// Format: [b'u', 0 or 255]
if size_byte == 0 || size_byte == 255 {
*pointer += 1;
return Ok(VsfType::u0(size_byte == 255));
}
*pointer += 1;
match size_byte {
b'0' => {
// Boolean: u0 with explicit '0' marker (alternative format)
if *pointer >= data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for u0",
));
}
let value = data[*pointer];
*pointer += 1;
match value {
0 => Ok(VsfType::u0(false)),
255 => Ok(VsfType::u0(true)),
_ => Err(Error::new(ErrorKind::InvalidData, "Invalid boolean value")),
}
}
b'3' => {
// u3: u8
if *pointer >= data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for u3",
));
}
let value = data[*pointer];
*pointer += 1;
Ok(VsfType::u3(value))
}
b'4' => {
// u4: u16
if *pointer + 2 > data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for u4",
));
}
let value = u16::from_be_bytes([data[*pointer], data[*pointer + 1]]);
*pointer += 2;
Ok(VsfType::u4(value))
}
b'5' => {
// u5: u32
if *pointer + 4 > data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for u5",
));
}
let value = u32::from_be_bytes([
data[*pointer],
data[*pointer + 1],
data[*pointer + 2],
data[*pointer + 3],
]);
*pointer += 4;
Ok(VsfType::u5(value))
}
b'6' => {
// u6: u64
if *pointer + 8 > data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for u6",
));
}
let value = u64::from_be_bytes([
data[*pointer],
data[*pointer + 1],
data[*pointer + 2],
data[*pointer + 3],
data[*pointer + 4],
data[*pointer + 5],
data[*pointer + 6],
data[*pointer + 7],
]);
*pointer += 8;
Ok(VsfType::u6(value))
}
b'7' => {
// u7: u128
if *pointer + 16 > data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for u7",
));
}
let value = u128::from_be_bytes([
data[*pointer],
data[*pointer + 1],
data[*pointer + 2],
data[*pointer + 3],
data[*pointer + 4],
data[*pointer + 5],
data[*pointer + 6],
data[*pointer + 7],
data[*pointer + 8],
data[*pointer + 9],
data[*pointer + 10],
data[*pointer + 11],
data[*pointer + 12],
data[*pointer + 13],
data[*pointer + 14],
data[*pointer + 15],
]);
*pointer += 16;
Ok(VsfType::u7(value))
}
_ => {
// Auto-sized u: decode as variable-length
*pointer -= 1; // Back up to re-read size marker
let value = decode_usize(data, pointer)?;
Ok(VsfType::u(value, false))
}
}
}
// ==================== SIGNED INTEGERS ====================
pub fn parse_signed(data: &[u8], pointer: &mut usize) -> Result<VsfType, Error> {
if *pointer >= data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for signed size marker",
));
}
let size_byte = data[*pointer];
*pointer += 1;
match size_byte {
b'3' => {
// i3: i8
if *pointer >= data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for i3",
));
}
let value = data[*pointer] as i8;
*pointer += 1;
Ok(VsfType::i3(value))
}
b'4' => {
// i4: i16
if *pointer + 2 > data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for i4",
));
}
let value = i16::from_be_bytes([data[*pointer], data[*pointer + 1]]);
*pointer += 2;
Ok(VsfType::i4(value))
}
b'5' => {
// i5: i32
if *pointer + 4 > data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for i5",
));
}
let value = i32::from_be_bytes([
data[*pointer],
data[*pointer + 1],
data[*pointer + 2],
data[*pointer + 3],
]);
*pointer += 4;
Ok(VsfType::i5(value))
}
b'6' => {
// i6: i64
if *pointer + 8 > data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for i6",
));
}
let value = i64::from_be_bytes([
data[*pointer],
data[*pointer + 1],
data[*pointer + 2],
data[*pointer + 3],
data[*pointer + 4],
data[*pointer + 5],
data[*pointer + 6],
data[*pointer + 7],
]);
*pointer += 8;
Ok(VsfType::i6(value))
}
b'7' => {
// i7: i128
if *pointer + 16 > data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for i7",
));
}
let value = i128::from_be_bytes([
data[*pointer],
data[*pointer + 1],
data[*pointer + 2],
data[*pointer + 3],
data[*pointer + 4],
data[*pointer + 5],
data[*pointer + 6],
data[*pointer + 7],
data[*pointer + 8],
data[*pointer + 9],
data[*pointer + 10],
data[*pointer + 11],
data[*pointer + 12],
data[*pointer + 13],
data[*pointer + 14],
data[*pointer + 15],
]);
*pointer += 16;
Ok(VsfType::i7(value))
}
_ => {
// Auto-sized i: decode as variable-length
*pointer -= 1; // Back up to re-read size marker
let value = decode_isize(data, pointer)?;
Ok(VsfType::i(value))
}
}
}
// ==================== IEEE FLOATS ====================
pub fn parse_float(data: &[u8], pointer: &mut usize) -> Result<VsfType, Error> {
if *pointer >= data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for float size marker",
));
}
let size_byte = data[*pointer];
*pointer += 1;
match size_byte {
b'5' => {
// f5: f32
if *pointer + 4 > data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for f5",
));
}
let value = f32::from_be_bytes([
data[*pointer],
data[*pointer + 1],
data[*pointer + 2],
data[*pointer + 3],
]);
*pointer += 4;
Ok(VsfType::f5(value))
}
b'6' => {
// f6: f64
if *pointer + 8 > data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for f6",
));
}
let value = f64::from_be_bytes([
data[*pointer],
data[*pointer + 1],
data[*pointer + 2],
data[*pointer + 3],
data[*pointer + 4],
data[*pointer + 5],
data[*pointer + 6],
data[*pointer + 7],
]);
*pointer += 8;
Ok(VsfType::f6(value))
}
_ => Err(Error::new(
ErrorKind::InvalidData,
"Invalid float size marker",
)),
}
}
// ==================== IEEE COMPLEX ====================
pub fn parse_complex(data: &[u8], pointer: &mut usize) -> Result<VsfType, Error> {
if *pointer >= data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for complex size marker",
));
}
let size_byte = data[*pointer];
*pointer += 1;
match size_byte {
b'5' => {
// j5: Complex<f32>
if *pointer + 8 > data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for j5",
));
}
let re = f32::from_be_bytes([
data[*pointer],
data[*pointer + 1],
data[*pointer + 2],
data[*pointer + 3],
]);
*pointer += 4;
let im = f32::from_be_bytes([
data[*pointer],
data[*pointer + 1],
data[*pointer + 2],
data[*pointer + 3],
]);
*pointer += 4;
Ok(VsfType::j5(Complex::new(re, im)))
}
b'6' => {
// j6: Complex<f64>
if *pointer + 16 > data.len() {
return Err(Error::new(
ErrorKind::UnexpectedEof,
"Not enough data for j6",
));
}
let re = f64::from_be_bytes([
data[*pointer],
data[*pointer + 1],
data[*pointer + 2],
data[*pointer + 3],
data[*pointer + 4],
data[*pointer + 5],
data[*pointer + 6],
data[*pointer + 7],
]);
*pointer += 8;
let im = f64::from_be_bytes([
data[*pointer],
data[*pointer + 1],
data[*pointer + 2],
data[*pointer + 3],
data[*pointer + 4],
data[*pointer + 5],
data[*pointer + 6],
data[*pointer + 7],
]);
*pointer += 8;
Ok(VsfType::j6(Complex::new(re, im)))
}
_ => Err(Error::new(
ErrorKind::InvalidData,
"Invalid complex size marker",
)),
}
}