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use crate::error::Result;
use crate::reader::BinaryReader;
use std::io::{Read, Seek};
/// The critical preamble containing addresses and acquisition date.
#[derive(Debug)]
pub struct RawFileInfoPreamble {
pub method_file_present: bool,
pub year: u16,
pub month: u16,
pub day_of_week: u16,
pub day: u16,
pub hour: u16,
pub minute: u16,
pub second: u16,
pub millisecond: u16,
pub controller_count: u32,
/// File offset to the scan data stream.
pub data_addr: u64,
/// File offset to the first RunHeader (may be a non-MS controller in multi-controller files).
pub run_header_addr: u64,
/// All run header addresses (one per controller). Index 0 == run_header_addr.
pub run_header_addrs: Vec<u64>,
/// Second RunHeader address (for multi-controller files).
pub run_header_addr_2: u64,
}
/// RawFileInfo: preamble + label strings + computer name.
#[derive(Debug)]
pub struct RawFileInfo {
pub preamble: RawFileInfoPreamble,
pub label_headings: Vec<String>,
pub computer_name: String,
}
impl RawFileInfo {
pub(crate) fn read<R: Read + Seek>(r: &mut BinaryReader<R>, version: u32) -> Result<Self> {
let preamble = RawFileInfoPreamble::read(r, version)?;
// 5 label heading strings + computer name
let mut label_headings = Vec::with_capacity(5);
for _ in 0..5 {
label_headings.push(r.read_pascal_string()?);
}
let computer_name = r.read_pascal_string()?;
Ok(Self {
preamble,
label_headings,
computer_name,
})
}
}
impl RawFileInfoPreamble {
pub(crate) fn read<R: Read + Seek>(r: &mut BinaryReader<R>, version: u32) -> Result<Self> {
let method_file_present = r.read_u32()? != 0;
let year = r.read_u16()?;
let month = r.read_u16()?;
let day_of_week = r.read_u16()?;
let day = r.read_u16()?;
let hour = r.read_u16()?;
let minute = r.read_u16()?;
let second = r.read_u16()?;
let millisecond = r.read_u16()?;
if version >= 64 {
// Version 66 layout
let _unk2 = r.read_u32()?;
let _data_addr_32 = r.read_u32()?; // defunct
let controller_count = r.read_u32()?;
let _controller_n2 = r.read_u32()?;
let _unk5 = r.read_u32()?;
let _unk6 = r.read_u32()?;
let _run_header_addr_32 = r.read_u32()?; // defunct
// Skip unknown_area[1]: 760 bytes
r.skip(760)?;
// Controller address table. Layout is:
// [data_addr: u64] [u32] [u32] -- scan data entry
// [run_hdr[0]: u64] [u32] [u32] -- controller 0
// [run_hdr[1]: u64] [u32] [u32] -- controller 1
// ... (for every controller beyond 2, each entry is 16 bytes
// and lives at the start of what used to be "unknown_area[2]")
// [padding zeros to fill 1048-byte region]
//
// The total region (from data_addr through the skip) is 1048 bytes for
// a 2-controller file. Each extra controller takes 16 bytes from the skip.
let data_addr = r.read_u64()?;
let _unk7 = r.read_u32()?;
let _unk8 = r.read_u32()?;
let mut run_header_addrs = Vec::new();
// Always read at least 2 entries for compatibility
let n_read = controller_count.max(2) as usize;
for _ in 0..n_read {
let addr = r.read_u64()?;
let _unk_a = r.read_u32()?;
let _unk_b = r.read_u32()?;
run_header_addrs.push(addr);
}
let run_header_addr = run_header_addrs[0];
let run_header_addr_2 = run_header_addrs.get(1).copied().unwrap_or(0);
// Remaining padding to reach end of address-table region.
// The region size differs by file version:
// v64: 1032 bytes (data entry + up to ~2 controller entries + padding)
// v66+: 1048 bytes (one extra slot for the additional controller table)
let used_bytes = 16usize + n_read * 16;
let total_region = if version >= 66 { 1048usize } else { 1032usize };
let remaining = total_region.saturating_sub(used_bytes);
r.skip(remaining)?;
Ok(Self {
method_file_present,
year,
month,
day_of_week,
day,
hour,
minute,
second,
millisecond,
controller_count,
data_addr,
run_header_addr,
run_header_addrs,
run_header_addr_2,
})
} else {
// Pre-v64 (32-bit addresses)
let _unk2 = r.read_u32()?;
let data_addr = r.read_u32()? as u64;
let controller_count = r.read_u32()?;
let _controller_n2 = r.read_u32()?;
let _unk5 = r.read_u32()?;
let _unk6 = r.read_u32()?;
let run_header_addr = r.read_u32()? as u64;
let _unk7 = r.read_u32()?;
let _unk8 = r.read_u32()?;
let run_header_addr_2 = r.read_u32()? as u64;
// Skip unknown_area: 744 bytes
r.skip(744)?;
Ok(Self {
method_file_present,
year,
month,
day_of_week,
day,
hour,
minute,
second,
millisecond,
controller_count,
data_addr,
run_header_addr,
run_header_addrs: vec![run_header_addr, run_header_addr_2],
run_header_addr_2,
})
}
}
}