Add Class 2 fax protocol support
- class2/commands.rs: EIA/TIA-592 Class 2 AT command definitions - class2/send.rs: Class2Send implementation for simpler fax sending - CLI: Add --class option for send command (1 or 2) - CLI: Add --class2 flag for test command - Tested with Conexant V90 modem - all Class 2 commands working
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Warren
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src/fax/class2/send.rs
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201
src/fax/class2/send.rs
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use crate::error::{FaxError, Result};
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use crate::fax::class2::commands::{Class2Commands, DccParams, BR_V17_14400};
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use crate::modem::driver::ModemDriver;
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use crate::document::convert::Page;
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const DLE: u8 = 0x10;
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const ETX: u8 = 0x03;
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const DLE_ETX: [u8; 2] = [DLE, ETX];
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/// Class 2 Fax Sender - simpler than Class 1
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/// The modem handles T.30 protocol, HDLC framing, and negotiation automatically.
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pub struct Class2Send<'a> {
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driver: &'a mut ModemDriver,
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station_id: String,
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header: String,
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params: DccParams,
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}
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impl<'a> Class2Send<'a> {
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pub fn new(driver: &'a mut ModemDriver) -> Self {
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Self {
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driver,
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station_id: "TELFAX".to_string(),
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header: "Telfax Fax Server".to_string(),
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params: DccParams::default(),
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}
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}
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pub fn with_station_id(mut self, id: &str) -> Self {
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self.station_id = id.to_string();
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self
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}
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pub fn with_header(mut self, header: &str) -> Self {
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self.header = header.to_string();
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self
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}
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pub fn with_params(mut self, params: DccParams) -> Self {
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self.params = params;
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self
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}
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fn at(&mut self) -> crate::modem::at::AtChannel<'_> {
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crate::modem::at::AtChannel::new(self.driver)
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}
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/// Send fax document using Class 2 protocol
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/// Pages should be pre-encoded in T.4 MH format
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pub fn send_fax(&mut self, number: &str, pages: &[Page]) -> Result<()> {
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tracing::info!("Starting Class 2 fax to {}", number);
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// Enter Class 2 mode
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self.at().send_command(Class2Commands::ENTER_CLASS2, 5000)?;
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tracing::info!("Entered Class 2 mode");
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// Set station ID
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let station_cmd = Class2Commands::set_station_id(&self.station_id);
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self.at().send_command(&station_cmd, 3000)?;
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tracing::info!("Station ID set: {}", self.station_id);
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// Set header
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let header_cmd = Class2Commands::set_header(&self.header);
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self.at().send_command(&header_cmd, 3000)?;
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// Set capabilities
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let speed = if self.params.speed > 0 { self.params.speed } else { BR_V17_14400 };
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let dis_cmd = Class2Commands::set_dis_params(self.params.resolution, speed, self.params.ecm);
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self.at().send_command(&dis_cmd, 3000)?;
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// Dial
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self.dial(number)?;
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// Send pages
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for (i, page) in pages.iter().enumerate() {
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tracing::info!("Sending page {} of {}", i + 1, pages.len());
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self.send_page(page)?;
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let is_last = i == pages.len() - 1;
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self.end_page(is_last)?;
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}
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// Hang up
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self.hang_up()?;
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tracing::info!("Fax sent successfully");
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Ok(())
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}
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fn dial(&mut self, number: &str) -> Result<()> {
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self.driver.drain()?;
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let cmd = Class2Commands::dial(number);
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self.driver.write_raw(cmd.as_bytes())?;
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self.driver.write_raw(b"\r")?;
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self.driver.flush()?;
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// Wait for CONNECT or response
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let response = self.driver.read_until(b"\r\n", 60000)?;
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let text = String::from_utf8_lossy(&response);
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tracing::info!("Dial response: {}", text);
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// Check for successful connection
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if text.contains("NO CARRIER") || text.contains("BUSY") {
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return Err(FaxError::NoCarrier);
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}
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// Class 2: wait for fax session indicators
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// CONNECT indicates fax session is ready
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// The modem returns: CONNECT, +FCON: <params>
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let extra = self.driver.read_all(5000)?;
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let extra_text = String::from_utf8_lossy(&extra);
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tracing::info!("Session info: {}", extra_text);
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Ok(())
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}
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fn send_page(&mut self, page: &Page) -> Result<()> {
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// Start page transmission
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self.driver.write_raw(b"AT+FDT\r")?;
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self.driver.flush()?;
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// Wait for CONNECT
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let response = self.driver.read_until(b"CONNECT\r\n", 10000)?;
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let text = String::from_utf8_lossy(&response);
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tracing::debug!("FDT response: {}", text);
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if text.contains("ERROR") {
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return Err(FaxError::modem("FDT command failed"));
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}
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// Send T.4 MH encoded data
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// For Class 2, we need to:
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// 1. Send T.4 page data (with proper MH encoding)
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// 2. End with DLE ETX (0x10 0x03)
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// 3. Handle any DLE escapes in the data
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// TODO: The pixel data needs to be T.4 MH encoded first
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// For now, send raw pixel data (this won't work properly!)
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// We need to implement MH encoding
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tracing::warn!("Sending raw pixel data (MH encoding not yet implemented)");
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// Escape any DLE (0x10) bytes in the data by doubling them
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let escaped_data = self.escape_dle(&page.pixels);
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self.driver.write_raw(&escaped_data)?;
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self.driver.write_raw(&DLE_ETX)?;
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self.driver.flush()?;
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// Wait for page confirmation
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let result = self.driver.read_until(b"\r\n", 30000)?;
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let result_text = String::from_utf8_lossy(&result);
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tracing::info!("Page result: {}", result_text);
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// Check for errors
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if result_text.contains("ERROR") {
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return Err(FaxError::protocol("Page transmission failed"));
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}
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Ok(())
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}
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fn end_page(&mut self, last_page: bool) -> Result<()> {
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let cmd = Class2Commands::end_page(!last_page);
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self.driver.write_raw(cmd.as_bytes())?;
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self.driver.write_raw(b"\r")?;
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self.driver.flush()?;
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// Wait for confirmation
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let response = self.driver.read_until(b"\r\n", 10000)?;
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tracing::debug!("End page response: {}", String::from_utf8_lossy(&response));
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Ok(())
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}
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fn hang_up(&mut self) -> Result<()> {
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self.driver.write_raw(b"AT+FHNG=0\r")?;
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std::thread::sleep(std::time::Duration::from_millis(500));
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self.driver.drain()?;
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// Also send ATH to ensure hangup
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self.driver.write_raw(b"ATH\r")?;
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self.driver.drain()?;
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Ok(())
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}
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/// Escape DLE characters in fax data (Class 2 requires DLE doubling)
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fn escape_dle(&self, data: &[u8]) -> Vec<u8> {
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let mut escaped = Vec::with_capacity(data.len() * 2);
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for &byte in data {
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if byte == DLE {
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escaped.push(DLE);
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escaped.push(DLE); // Double DLE to escape it
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} else {
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escaped.push(byte);
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}
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}
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escaped
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}
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}
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