253 lines
8.3 KiB
Rust
253 lines
8.3 KiB
Rust
//! QRCode encoder
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//!
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//! This crate provides a QR code and Micro QR code encoder for binary data.
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//!
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//! use qrcode::QrCode;
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//!
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//! let code = QrCode::new(b"Some content here.");
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//! match code {
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//! Err(err) => panic!("Failed to encode the QR code: {:?}", err),
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//! Ok(code) => {
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//! for y in 0 .. code.width() {
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//! for x in 0 .. code.width() {
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//! let color = if code[(x, y)] { "black" } else { "white" };
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//! // render color at position (x, y)
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//! }
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//! }
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//! }
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//! }
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//!
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#![cfg_attr(feature="bench", feature(test))] // Unstable libraries
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#[cfg(feature="bench")]
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extern crate test;
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extern crate num_traits;
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use std::ops::Index;
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pub use types::{QrResult, EcLevel, Version};
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pub mod types;
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pub mod bits;
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pub mod optimize;
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pub mod ec;
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pub mod canvas;
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/// The encoded QR code symbol.
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#[derive(Clone)]
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pub struct QrCode {
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content: Vec<bool>,
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version: Version,
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ec_level: EcLevel,
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width: usize,
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}
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impl QrCode {
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/// Constructs a new QR code which automatically encodes the given data.
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///
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/// This method uses the "medium" error correction level and automatically
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/// chooses the smallest QR code.
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///
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/// use qrcode::QrCode;
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///
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/// let code = QrCode::new(b"Some data").unwrap();
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///
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pub fn new<D: AsRef<[u8]>>(data: D) -> QrResult<QrCode> {
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QrCode::with_error_correction_level(data, EcLevel::M)
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}
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/// Constructs a new QR code which automatically encodes the given data at a
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/// specific error correction level.
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///
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/// This method automatically chooses the smallest QR code.
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///
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/// use qrcode::{QrCode, EcLevel};
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///
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/// let code = QrCode::with_error_correction_level(b"Some data", EcLevel::H).unwrap();
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///
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pub fn with_error_correction_level<D: AsRef<[u8]>>(data: D, ec_level: EcLevel) -> QrResult<QrCode> {
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let bits = try!(bits::encode_auto(data.as_ref(), ec_level));
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QrCode::with_bits(bits, ec_level)
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}
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/// Constructs a new QR code for the given version and error correction
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/// level.
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///
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/// use qrcode::{QrCode, Version, EcLevel};
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///
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/// let code = QrCode::with_version(b"Some data", Version::Normal(5), EcLevel::M).unwrap();
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///
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/// This method can also be used to generate Micro QR code.
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///
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/// use qrcode::{QrCode, Version, EcLevel};
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///
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/// let micro_code = QrCode::with_version(b"123", Version::Micro(1), EcLevel::L).unwrap();
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///
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pub fn with_version<D: AsRef<[u8]>>(data: D, version: Version, ec_level: EcLevel) -> QrResult<QrCode> {
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let mut bits = bits::Bits::new(version);
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try!(bits.push_optimal_data(data.as_ref()));
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try!(bits.push_terminator(ec_level));
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QrCode::with_bits(bits, ec_level)
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}
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/// Constructs a new QR code with encoded bits.
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///
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/// Use this method only if there are very special need to manipulate the
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/// raw bits before encoding. Some examples are:
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///
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/// * Encode data using specific character set with ECI
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/// * Use the FNC1 modes
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/// * Avoid the optimal segmentation algorithm
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///
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/// See the `Bits` structure for detail.
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///
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/// #![allow(unused_must_use)]
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///
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/// use qrcode::{QrCode, Version, EcLevel};
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/// use qrcode::bits::Bits;
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///
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/// let mut bits = Bits::new(Version::Normal(1));
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/// bits.push_eci_designator(9);
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/// bits.push_byte_data(b"\xca\xfe\xe4\xe9\xea\xe1\xf2 QR");
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/// bits.push_terminator(EcLevel::L);
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/// let qrcode = QrCode::with_bits(bits, EcLevel::L);
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///
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pub fn with_bits(bits: bits::Bits, ec_level: EcLevel) -> QrResult<QrCode> {
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let version = bits.version();
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let data = bits.into_bytes();
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let (encoded_data, ec_data) = try!(ec::construct_codewords(&*data, version, ec_level));
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let mut canvas = canvas::Canvas::new(version, ec_level);
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canvas.draw_all_functional_patterns();
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canvas.draw_data(&*encoded_data, &*ec_data);
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let canvas = canvas.apply_best_mask();
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Ok(QrCode {
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content: canvas.to_bools(),
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version: version,
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ec_level: ec_level,
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width: version.width() as usize,
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})
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}
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/// Gets the version of this QR code.
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pub fn version(&self) -> Version {
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self.version
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}
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/// Gets the error correction level of this QR code.
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pub fn error_correction_level(&self) -> EcLevel {
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self.ec_level
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}
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/// Gets the number of modules per side, i.e. the width of this QR code.
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///
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/// The width here does not contain the quiet zone paddings.
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pub fn width(&self) -> usize {
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self.width
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}
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/// Gets the maximum number of allowed erratic modules can be introduced
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/// before the data becomes corrupted. Note that errors should not be
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/// introduced to functional modules.
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pub fn max_allowed_errors(&self) -> usize {
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ec::max_allowed_errors(self.version, self.ec_level).unwrap()
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}
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/// Checks whether a module at coordinate (x, y) is a functional module or
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/// not.
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pub fn is_functional(&self, x: usize, y: usize) -> bool {
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canvas::is_functional(self.version, self.version.width(), x as i16, y as i16)
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}
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/// Converts the QR code into a human-readable string. This is mainly for
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/// debugging only.
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pub fn to_debug_str(&self, on_char: char, off_char: char) -> String {
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let width = self.width;
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let mut k = 0;
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let mut res = String::with_capacity(width * (width + 1));
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for _ in 0 .. width {
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res.push('\n');
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for _ in 0 .. width {
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res.push(if self.content[k] { on_char } else { off_char });
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k += 1;
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}
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}
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res
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}
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/// Converts the QR code to a vector of booleans. Each entry represents the
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/// color of the module, with "true" means dark and "false" means light.
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pub fn to_vec(&self) -> Vec<bool> {
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self.content.clone()
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}
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/// Converts the QR code to a vector of booleans. Each entry represents the
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/// color of the module, with "true" means dark and "false" means light.
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pub fn into_vec(self) -> Vec<bool> {
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self.content
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}
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}
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impl Index<(usize, usize)> for QrCode {
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type Output = bool;
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fn index(&self, (x, y): (usize, usize)) -> &bool {
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let index = y * self.width + x;
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&self.content[index]
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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 {QrCode, Version, EcLevel};
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#[test]
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fn test_annex_i_qr() {
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// This uses the ISO Annex I as test vector.
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let code = QrCode::with_version(b"01234567", Version::Normal(1), EcLevel::M).unwrap();
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assert_eq!(&*code.to_debug_str('#', '.'), "\n\
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#######..#.##.#######\n\
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#.....#..####.#.....#\n\
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#.###.#.#.....#.###.#\n\
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#.###.#.##....#.###.#\n\
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#.###.#.#.###.#.###.#\n\
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#.....#.#...#.#.....#\n\
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#######.#.#.#.#######\n\
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........#..##........\n\
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#.#####..#..#.#####..\n\
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...#.#.##.#.#..#.##..\n\
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..#...##.#.#.#..#####\n\
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....#....#.....####..\n\
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...######..#.#..#....\n\
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........#.#####..##..\n\
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#######..##.#.##.....\n\
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#.....#.#.#####...#.#\n\
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#.###.#.#...#..#.##..\n\
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#.###.#.##..#..#.....\n\
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#.###.#.#.##.#..#.#..\n\
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#.....#........##.##.\n\
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#######.####.#..#.#..");
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}
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#[test]
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fn test_annex_i_micro_qr() {
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let code = QrCode::with_version(b"01234567", Version::Micro(2), EcLevel::L).unwrap();
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assert_eq!(&*code.to_debug_str('#', '.'), "\n\
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#######.#.#.#\n\
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#.....#.###.#\n\
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#.###.#..##.#\n\
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#.###.#..####\n\
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#.###.#.###..\n\
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#.....#.#...#\n\
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#######..####\n\
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.........##..\n\
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##.#....#...#\n\
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.##.#.#.#.#.#\n\
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###..#######.\n\
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...#.#....##.\n\
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###.#..##.###");
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}
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}
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