931 lines
30 KiB
Rust
931 lines
30 KiB
Rust
//! The `bits` module encodes binary data into raw bits used in a QR code.
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use std::cmp::min;
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#[cfg(feature = "bench")]
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extern crate test;
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use crate::cast::{As, Truncate};
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use crate::optimize::{total_encoded_len, Optimizer, Parser, Segment};
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use crate::types::{EcLevel, Mode, QrError, QrResult, Version};
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//------------------------------------------------------------------------------
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//{{{ Bits
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/// The `Bits` structure stores the encoded data for a QR code.
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pub struct Bits {
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data: Vec<u8>,
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bit_offset: usize,
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version: Version,
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}
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impl Bits {
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/// Constructs a new, empty bits structure.
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pub fn new(version: Version) -> Self {
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Self { data: Vec::new(), bit_offset: 0, version }
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}
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/// Pushes an N-bit big-endian integer to the end of the bits.
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///
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/// Note: It is up to the developer to ensure that `number` really only is
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/// `n` bit in size. Otherwise the excess bits may stomp on the existing
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/// ones.
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fn push_number(&mut self, n: usize, number: u16) {
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debug_assert!(n == 16 || n < 16 && number < (1 << n), "{} is too big as a {}-bit number", number, n);
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let b = self.bit_offset + n;
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let last_index = self.data.len().wrapping_sub(1);
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match (self.bit_offset, b) {
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(0, 0..=8) => {
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self.data.push((number << (8 - b)).truncate_as_u8());
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}
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(0, _) => {
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self.data.push((number >> (b - 8)).truncate_as_u8());
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self.data.push((number << (16 - b)).truncate_as_u8());
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}
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(_, 0..=8) => {
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self.data[last_index] |= (number << (8 - b)).truncate_as_u8();
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}
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(_, 9..=16) => {
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self.data[last_index] |= (number >> (b - 8)).truncate_as_u8();
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self.data.push((number << (16 - b)).truncate_as_u8());
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}
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_ => {
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self.data[last_index] |= (number >> (b - 8)).truncate_as_u8();
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self.data.push((number >> (b - 16)).truncate_as_u8());
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self.data.push((number << (24 - b)).truncate_as_u8());
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}
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}
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self.bit_offset = b & 7;
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}
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/// Pushes an N-bit big-endian integer to the end of the bits, and check
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/// that the number does not overflow the bits.
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///
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/// Returns `Err(QrError::DataTooLong)` on overflow.
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fn push_number_checked(&mut self, n: usize, number: usize) -> QrResult<()> {
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if n > 16 || number >= (1 << n) {
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Err(QrError::DataTooLong)
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} else {
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self.push_number(n, number.as_u16());
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Ok(())
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}
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}
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/// Reserves `n` extra bits of space for pushing.
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fn reserve(&mut self, n: usize) {
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let extra_bytes = (n + (8 - self.bit_offset) % 8) / 8;
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self.data.reserve(extra_bytes);
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}
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/// Convert the bits into a bytes vector.
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pub fn into_bytes(self) -> Vec<u8> {
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self.data
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}
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/// Total number of bits currently pushed.
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pub fn len(&self) -> usize {
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if self.bit_offset == 0 {
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self.data.len() * 8
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} else {
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(self.data.len() - 1) * 8 + self.bit_offset
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}
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}
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/// Whether there are any bits pushed.
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pub fn is_empty(&self) -> bool {
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self.data.is_empty()
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}
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/// The maximum number of bits allowed by the provided QR code version and
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/// error correction level.
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pub fn max_len(&self, ec_level: EcLevel) -> QrResult<usize> {
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self.version.fetch(ec_level, &DATA_LENGTHS)
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}
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/// Version of the 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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}
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#[test]
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fn test_push_number() {
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let mut bits = Bits::new(Version::Normal(1));
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bits.push_number(3, 0b010); // 0:0 .. 0:3
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bits.push_number(3, 0b110); // 0:3 .. 0:6
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bits.push_number(3, 0b101); // 0:6 .. 1:1
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bits.push_number(7, 0b001_1010); // 1:1 .. 2:0
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bits.push_number(4, 0b1100); // 2:0 .. 2:4
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bits.push_number(12, 0b1011_0110_1101); // 2:4 .. 4:0
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bits.push_number(10, 0b01_1001_0001); // 4:0 .. 5:2
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bits.push_number(15, 0b111_0010_1110_0011); // 5:2 .. 7:1
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let bytes = bits.into_bytes();
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assert_eq!(
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bytes,
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vec![
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0b010__110__10, // 90
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0b1__001_1010, // 154
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0b1100__1011, // 203
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0b0110_1101, // 109
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0b01_1001_00, // 100
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0b01__111_001, // 121
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0b0_1110_001, // 113
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0b1__0000000, // 128
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]
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);
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}
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#[cfg(feature = "bench")]
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#[bench]
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fn bench_push_splitted_bytes(bencher: &mut test::Bencher) {
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bencher.iter(|| {
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let mut bits = Bits::new(Version::Normal(40));
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bits.push_number(4, 0b0101);
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for _ in 0..1024 {
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bits.push_number(8, 0b10101010);
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}
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bits.into_bytes()
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});
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}
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//}}}
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//------------------------------------------------------------------------------
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//{{{ Mode indicator
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/// An "extended" mode indicator, includes all indicators supported by QR code
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/// beyond those bearing data.
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#[derive(Copy, Clone)]
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pub enum ExtendedMode {
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/// ECI mode indicator, to introduce an ECI designator.
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Eci,
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/// The normal mode to introduce data.
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Data(Mode),
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/// FNC-1 mode in the first position.
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Fnc1First,
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/// FNC-1 mode in the second position.
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Fnc1Second,
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/// Structured append.
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StructuredAppend,
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}
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impl Bits {
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/// Push the mode indicator to the end of the bits.
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///
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/// If the mode is not supported in the provided version, this method
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/// returns `Err(QrError::UnsupportedCharacterSet)`.
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pub fn push_mode_indicator(&mut self, mode: ExtendedMode) -> QrResult<()> {
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#[allow(clippy::match_same_arms)]
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let number = match (self.version, mode) {
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(Version::Micro(1), ExtendedMode::Data(Mode::Numeric)) => return Ok(()),
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(Version::Micro(_), ExtendedMode::Data(Mode::Numeric)) => 0,
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(Version::Micro(_), ExtendedMode::Data(Mode::Alphanumeric)) => 1,
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(Version::Micro(_), ExtendedMode::Data(Mode::Byte)) => 0b10,
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(Version::Micro(_), ExtendedMode::Data(Mode::Kanji)) => 0b11,
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(Version::Micro(_), _) => return Err(QrError::UnsupportedCharacterSet),
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(_, ExtendedMode::Data(Mode::Numeric)) => 0b0001,
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(_, ExtendedMode::Data(Mode::Alphanumeric)) => 0b0010,
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(_, ExtendedMode::Data(Mode::Byte)) => 0b0100,
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(_, ExtendedMode::Data(Mode::Kanji)) => 0b1000,
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(_, ExtendedMode::Eci) => 0b0111,
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(_, ExtendedMode::Fnc1First) => 0b0101,
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(_, ExtendedMode::Fnc1Second) => 0b1001,
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(_, ExtendedMode::StructuredAppend) => 0b0011,
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};
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let bits = self.version.mode_bits_count();
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self.push_number_checked(bits, number).or(Err(QrError::UnsupportedCharacterSet))
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}
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}
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//}}}
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//------------------------------------------------------------------------------
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//{{{ ECI
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impl Bits {
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/// Push an ECI (Extended Channel Interpretation) designator to the bits.
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///
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/// An ECI designator is a 6-digit number to specify the character set of
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/// the following binary data. After calling this method, one could call
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/// `.push_byte_data()` or similar methods to insert the actual data, e.g.
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///
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/// #![allow(unused_must_use)]
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///
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/// use qrcode::bits::Bits;
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/// use qrcode::types::Version;
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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); // 9 = ISO-8859-7 (Greek).
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/// bits.push_byte_data(b"\xa1\xa2\xa3\xa4\xa5"); // ΑΒΓΔΕ
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///
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///
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/// The full list of ECI designator values can be found from
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/// <http://strokescribe.com/en/ECI.html>. Some example values are:
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///
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/// ECI # | Character set
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/// ------|-------------------------------------
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/// 3 | ISO-8859-1 (Western European)
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/// 20 | Shift JIS (Japanese)
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/// 23 | Windows 1252 (Latin 1) (Western European)
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/// 25 | UTF-16 Big Endian
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/// 26 | UTF-8
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/// 28 | Big 5 (Traditional Chinese)
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/// 29 | GB-18030 (Simplified Chinese)
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/// 30 | EUC-KR (Korean)
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///
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/// If the QR code version does not support ECI, this method will return
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/// `Err(QrError::UnsupportedCharacterSet)`.
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///
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/// If the designator is outside of the expected range, this method will
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/// return `Err(QrError::InvalidECIDesignator)`.
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pub fn push_eci_designator(&mut self, eci_designator: u32) -> QrResult<()> {
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self.reserve(12); // assume the common case that eci_designator <= 127.
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self.push_mode_indicator(ExtendedMode::Eci)?;
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match eci_designator {
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0..=127 => {
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self.push_number(8, eci_designator.as_u16());
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}
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128..=16383 => {
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self.push_number(2, 0b10);
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self.push_number(14, eci_designator.as_u16());
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}
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16384..=999_999 => {
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self.push_number(3, 0b110);
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self.push_number(5, (eci_designator >> 16).as_u16());
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self.push_number(16, (eci_designator & 0xffff).as_u16());
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}
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_ => return Err(QrError::InvalidEciDesignator),
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}
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Ok(())
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}
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}
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#[cfg(test)]
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mod eci_tests {
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use crate::bits::Bits;
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use crate::types::{QrError, Version};
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#[test]
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fn test_9() {
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let mut bits = Bits::new(Version::Normal(1));
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assert_eq!(bits.push_eci_designator(9), Ok(()));
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assert_eq!(bits.into_bytes(), vec![0b0111__0000, 0b1001__0000]);
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}
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#[test]
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fn test_899() {
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let mut bits = Bits::new(Version::Normal(1));
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assert_eq!(bits.push_eci_designator(899), Ok(()));
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assert_eq!(bits.into_bytes(), vec![0b0111__10_00, 0b00111000, 0b0011__0000]);
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}
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#[test]
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fn test_999999() {
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let mut bits = Bits::new(Version::Normal(1));
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assert_eq!(bits.push_eci_designator(999999), Ok(()));
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assert_eq!(bits.into_bytes(), vec![0b0111__110_0, 0b11110100, 0b00100011, 0b1111__0000]);
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}
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#[test]
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fn test_invalid_designator() {
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let mut bits = Bits::new(Version::Normal(1));
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assert_eq!(bits.push_eci_designator(1000000), Err(QrError::InvalidEciDesignator));
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}
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#[test]
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fn test_unsupported_character_set() {
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let mut bits = Bits::new(Version::Micro(4));
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assert_eq!(bits.push_eci_designator(9), Err(QrError::UnsupportedCharacterSet));
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}
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}
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//}}}
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//------------------------------------------------------------------------------
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//{{{ Mode::Numeric mode
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impl Bits {
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fn push_header(&mut self, mode: Mode, raw_data_len: usize) -> QrResult<()> {
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let length_bits = mode.length_bits_count(self.version);
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self.reserve(length_bits + 4 + mode.data_bits_count(raw_data_len));
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self.push_mode_indicator(ExtendedMode::Data(mode))?;
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self.push_number_checked(length_bits, raw_data_len)?;
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Ok(())
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}
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/// Encodes a numeric string to the bits.
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///
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/// The data should only contain the characters 0 to 9.
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pub fn push_numeric_data(&mut self, data: &[u8]) -> QrResult<()> {
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self.push_header(Mode::Numeric, data.len())?;
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for chunk in data.chunks(3) {
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let number = chunk.iter().map(|b| u16::from(*b - b'0')).fold(0, |a, b| a * 10 + b);
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let length = chunk.len() * 3 + 1;
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self.push_number(length, number);
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}
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Ok(())
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}
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}
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#[cfg(test)]
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mod numeric_tests {
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use crate::bits::Bits;
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use crate::types::{QrError, Version};
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#[test]
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fn test_iso_18004_2006_example_1() {
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let mut bits = Bits::new(Version::Normal(1));
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assert_eq!(bits.push_numeric_data(b"01234567"), Ok(()));
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assert_eq!(
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bits.into_bytes(),
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vec![0b0001_0000, 0b001000_00, 0b00001100, 0b01010110, 0b01_100001, 0b1__0000000]
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);
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}
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#[test]
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fn test_iso_18004_2000_example_2() {
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let mut bits = Bits::new(Version::Normal(1));
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assert_eq!(bits.push_numeric_data(b"0123456789012345"), Ok(()));
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assert_eq!(
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bits.into_bytes(),
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vec![
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0b0001_0000,
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0b010000_00,
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0b00001100,
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0b01010110,
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0b01_101010,
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0b0110_1110,
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0b000101_00,
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0b11101010,
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0b0101__0000,
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]
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);
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}
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#[test]
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fn test_iso_18004_2006_example_2() {
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let mut bits = Bits::new(Version::Micro(3));
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assert_eq!(bits.push_numeric_data(b"0123456789012345"), Ok(()));
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assert_eq!(
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bits.into_bytes(),
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vec![
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0b00_10000_0,
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0b00000110,
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0b0_0101011,
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0b001_10101,
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0b00110_111,
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0b0000101_0,
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0b01110101,
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0b00101__000,
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]
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);
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}
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#[test]
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fn test_data_too_long_error() {
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let mut bits = Bits::new(Version::Micro(1));
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assert_eq!(bits.push_numeric_data(b"12345678"), Err(QrError::DataTooLong));
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}
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}
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//}}}
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//------------------------------------------------------------------------------
|
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//{{{ Mode::Alphanumeric mode
|
||
|
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/// In QR code `Mode::Alphanumeric` mode, a pair of alphanumeric characters will
|
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/// be encoded as a base-45 integer. `alphanumeric_digit` converts each
|
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/// character into its corresponding base-45 digit.
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///
|
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/// The conversion is specified in ISO/IEC 18004:2006, §8.4.3, Table 5.
|
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#[inline]
|
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fn alphanumeric_digit(character: u8) -> u16 {
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match character {
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b'0'..=b'9' => u16::from(character - b'0'),
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b'A'..=b'Z' => u16::from(character - b'A') + 10,
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b' ' => 36,
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||
b'$' => 37,
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||
b'%' => 38,
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b'*' => 39,
|
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b'+' => 40,
|
||
b'-' => 41,
|
||
b'.' => 42,
|
||
b'/' => 43,
|
||
b':' => 44,
|
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_ => 0,
|
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}
|
||
}
|
||
|
||
impl Bits {
|
||
/// Encodes an alphanumeric string to the bits.
|
||
///
|
||
/// The data should only contain the charaters A to Z (excluding lowercase),
|
||
/// 0 to 9, space, `$`, `%`, `*`, `+`, `-`, `.`, `/` or `:`.
|
||
pub fn push_alphanumeric_data(&mut self, data: &[u8]) -> QrResult<()> {
|
||
self.push_header(Mode::Alphanumeric, data.len())?;
|
||
for chunk in data.chunks(2) {
|
||
let number = chunk.iter().map(|b| alphanumeric_digit(*b)).fold(0, |a, b| a * 45 + b);
|
||
let length = chunk.len() * 5 + 1;
|
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self.push_number(length, number);
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||
}
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Ok(())
|
||
}
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod alphanumeric_tests {
|
||
use crate::bits::Bits;
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||
use crate::types::{QrError, Version};
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||
|
||
#[test]
|
||
fn test_iso_18004_2006_example() {
|
||
let mut bits = Bits::new(Version::Normal(1));
|
||
assert_eq!(bits.push_alphanumeric_data(b"AC-42"), Ok(()));
|
||
assert_eq!(
|
||
bits.into_bytes(),
|
||
vec![0b0010_0000, 0b00101_001, 0b11001110, 0b11100111, 0b001_00001, 0b0__0000000]
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_micro_qr_unsupported() {
|
||
let mut bits = Bits::new(Version::Micro(1));
|
||
assert_eq!(bits.push_alphanumeric_data(b"A"), Err(QrError::UnsupportedCharacterSet));
|
||
}
|
||
|
||
#[test]
|
||
fn test_data_too_long() {
|
||
let mut bits = Bits::new(Version::Micro(2));
|
||
assert_eq!(bits.push_alphanumeric_data(b"ABCDEFGH"), Err(QrError::DataTooLong));
|
||
}
|
||
}
|
||
|
||
//}}}
|
||
//------------------------------------------------------------------------------
|
||
//{{{ Mode::Byte mode
|
||
|
||
impl Bits {
|
||
/// Encodes 8-bit byte data to the bits.
|
||
pub fn push_byte_data(&mut self, data: &[u8]) -> QrResult<()> {
|
||
self.push_header(Mode::Byte, data.len())?;
|
||
for b in data {
|
||
self.push_number(8, u16::from(*b));
|
||
}
|
||
Ok(())
|
||
}
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod byte_tests {
|
||
use crate::bits::Bits;
|
||
use crate::types::{QrError, Version};
|
||
|
||
#[test]
|
||
fn test() {
|
||
let mut bits = Bits::new(Version::Normal(1));
|
||
assert_eq!(bits.push_byte_data(b"\x12\x34\x56\x78\x9a\xbc\xde\xf0"), Ok(()));
|
||
assert_eq!(
|
||
bits.into_bytes(),
|
||
vec![
|
||
0b0100_0000,
|
||
0b1000_0001,
|
||
0b0010_0011,
|
||
0b0100_0101,
|
||
0b0110_0111,
|
||
0b1000_1001,
|
||
0b1010_1011,
|
||
0b1100_1101,
|
||
0b1110_1111,
|
||
0b0000__0000,
|
||
]
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_micro_qr_unsupported() {
|
||
let mut bits = Bits::new(Version::Micro(2));
|
||
assert_eq!(bits.push_byte_data(b"?"), Err(QrError::UnsupportedCharacterSet));
|
||
}
|
||
|
||
#[test]
|
||
fn test_data_too_long() {
|
||
let mut bits = Bits::new(Version::Micro(3));
|
||
assert_eq!(bits.push_byte_data(b"0123456701234567"), Err(QrError::DataTooLong));
|
||
}
|
||
}
|
||
|
||
//}}}
|
||
//------------------------------------------------------------------------------
|
||
//{{{ Mode::Kanji mode
|
||
|
||
impl Bits {
|
||
/// Encodes Shift JIS double-byte data to the bits.
|
||
pub fn push_kanji_data(&mut self, data: &[u8]) -> QrResult<()> {
|
||
self.push_header(Mode::Kanji, data.len() / 2)?;
|
||
for kanji in data.chunks(2) {
|
||
if kanji.len() != 2 {
|
||
return Err(QrError::InvalidCharacter);
|
||
}
|
||
let cp = u16::from(kanji[0]) * 256 + u16::from(kanji[1]);
|
||
let bytes = if cp < 0xe040 { cp - 0x8140 } else { cp - 0xc140 };
|
||
let number = (bytes >> 8) * 0xc0 + (bytes & 0xff);
|
||
self.push_number(13, number);
|
||
}
|
||
Ok(())
|
||
}
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod kanji_tests {
|
||
use crate::bits::Bits;
|
||
use crate::types::{QrError, Version};
|
||
|
||
#[test]
|
||
fn test_iso_18004_example() {
|
||
let mut bits = Bits::new(Version::Normal(1));
|
||
assert_eq!(bits.push_kanji_data(b"\x93\x5f\xe4\xaa"), Ok(()));
|
||
assert_eq!(bits.into_bytes(), vec![0b1000_0000, 0b0010_0110, 0b11001111, 0b1_1101010, 0b101010__00]);
|
||
}
|
||
|
||
#[test]
|
||
fn test_micro_qr_unsupported() {
|
||
let mut bits = Bits::new(Version::Micro(2));
|
||
assert_eq!(bits.push_kanji_data(b"?"), Err(QrError::UnsupportedCharacterSet));
|
||
}
|
||
|
||
#[test]
|
||
fn test_data_too_long() {
|
||
let mut bits = Bits::new(Version::Micro(3));
|
||
assert_eq!(bits.push_kanji_data(b"\x93_\x93_\x93_\x93_\x93_\x93_\x93_\x93_"), Err(QrError::DataTooLong));
|
||
}
|
||
}
|
||
|
||
//}}}
|
||
//------------------------------------------------------------------------------
|
||
//{{{ FNC1 mode
|
||
|
||
impl Bits {
|
||
/// Encodes an indicator that the following data are formatted according to
|
||
/// the UCC/EAN Application Identifiers standard.
|
||
///
|
||
/// #![allow(unused_must_use)]
|
||
///
|
||
/// use qrcode::bits::Bits;
|
||
/// use qrcode::types::Version;
|
||
///
|
||
/// let mut bits = Bits::new(Version::Normal(1));
|
||
/// bits.push_fnc1_first_position();
|
||
/// bits.push_numeric_data(b"01049123451234591597033130128");
|
||
/// bits.push_alphanumeric_data(b"%10ABC123");
|
||
///
|
||
/// In QR code, the character `%` is used as the data field separator (0x1D).
|
||
pub fn push_fnc1_first_position(&mut self) -> QrResult<()> {
|
||
self.push_mode_indicator(ExtendedMode::Fnc1First)
|
||
}
|
||
|
||
/// Encodes an indicator that the following data are formatted in accordance
|
||
/// with specific industry or application specifications previously agreed
|
||
/// with AIM International.
|
||
///
|
||
/// #![allow(unused_must_use)]
|
||
///
|
||
/// use qrcode::bits::Bits;
|
||
/// use qrcode::types::Version;
|
||
///
|
||
/// let mut bits = Bits::new(Version::Normal(1));
|
||
/// bits.push_fnc1_second_position(37);
|
||
/// bits.push_alphanumeric_data(b"AA1234BBB112");
|
||
/// bits.push_byte_data(b"text text text text\r");
|
||
///
|
||
/// If the application indicator is a single Latin alphabet (a–z / A–Z),
|
||
/// please pass in its ASCII value + 100:
|
||
///
|
||
/// ```ignore
|
||
/// bits.push_fnc1_second_position(b'A' + 100);
|
||
/// ```
|
||
pub fn push_fnc1_second_position(&mut self, application_indicator: u8) -> QrResult<()> {
|
||
self.push_mode_indicator(ExtendedMode::Fnc1Second)?;
|
||
self.push_number(8, u16::from(application_indicator));
|
||
Ok(())
|
||
}
|
||
}
|
||
|
||
//}}}
|
||
//------------------------------------------------------------------------------
|
||
//{{{ Finish
|
||
|
||
// This table is copied from ISO/IEC 18004:2006 §6.4.10, Table 7.
|
||
static DATA_LENGTHS: [[usize; 4]; 44] = [
|
||
// Normal versions
|
||
[152, 128, 104, 72],
|
||
[272, 224, 176, 128],
|
||
[440, 352, 272, 208],
|
||
[640, 512, 384, 288],
|
||
[864, 688, 496, 368],
|
||
[1088, 864, 608, 480],
|
||
[1248, 992, 704, 528],
|
||
[1552, 1232, 880, 688],
|
||
[1856, 1456, 1056, 800],
|
||
[2192, 1728, 1232, 976],
|
||
[2592, 2032, 1440, 1120],
|
||
[2960, 2320, 1648, 1264],
|
||
[3424, 2672, 1952, 1440],
|
||
[3688, 2920, 2088, 1576],
|
||
[4184, 3320, 2360, 1784],
|
||
[4712, 3624, 2600, 2024],
|
||
[5176, 4056, 2936, 2264],
|
||
[5768, 4504, 3176, 2504],
|
||
[6360, 5016, 3560, 2728],
|
||
[6888, 5352, 3880, 3080],
|
||
[7456, 5712, 4096, 3248],
|
||
[8048, 6256, 4544, 3536],
|
||
[8752, 6880, 4912, 3712],
|
||
[9392, 7312, 5312, 4112],
|
||
[10208, 8000, 5744, 4304],
|
||
[10960, 8496, 6032, 4768],
|
||
[11744, 9024, 6464, 5024],
|
||
[12248, 9544, 6968, 5288],
|
||
[13048, 10136, 7288, 5608],
|
||
[13880, 10984, 7880, 5960],
|
||
[14744, 11640, 8264, 6344],
|
||
[15640, 12328, 8920, 6760],
|
||
[16568, 13048, 9368, 7208],
|
||
[17528, 13800, 9848, 7688],
|
||
[18448, 14496, 10288, 7888],
|
||
[19472, 15312, 10832, 8432],
|
||
[20528, 15936, 11408, 8768],
|
||
[21616, 16816, 12016, 9136],
|
||
[22496, 17728, 12656, 9776],
|
||
[23648, 18672, 13328, 10208],
|
||
// Micro versions
|
||
[20, 0, 0, 0],
|
||
[40, 32, 0, 0],
|
||
[84, 68, 0, 0],
|
||
[128, 112, 80, 0],
|
||
];
|
||
|
||
impl Bits {
|
||
/// Pushes the ending bits to indicate no more data.
|
||
pub fn push_terminator(&mut self, ec_level: EcLevel) -> QrResult<()> {
|
||
let terminator_size = match self.version {
|
||
Version::Micro(a) => a.as_usize() * 2 + 1,
|
||
_ => 4,
|
||
};
|
||
|
||
let cur_length = self.len();
|
||
let data_length = self.max_len(ec_level)?;
|
||
if cur_length > data_length {
|
||
return Err(QrError::DataTooLong);
|
||
}
|
||
|
||
let terminator_size = min(terminator_size, data_length - cur_length);
|
||
if terminator_size > 0 {
|
||
self.push_number(terminator_size, 0);
|
||
}
|
||
|
||
if self.len() < data_length {
|
||
const PADDING_BYTES: &[u8] = &[0b1110_1100, 0b0001_0001];
|
||
|
||
self.bit_offset = 0;
|
||
let data_bytes_length = data_length / 8;
|
||
let padding_bytes_count = data_bytes_length - self.data.len();
|
||
let padding = PADDING_BYTES.iter().cloned().cycle().take(padding_bytes_count);
|
||
self.data.extend(padding);
|
||
}
|
||
|
||
if self.len() < data_length {
|
||
self.data.push(0);
|
||
}
|
||
|
||
Ok(())
|
||
}
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod finish_tests {
|
||
use crate::bits::Bits;
|
||
use crate::types::{EcLevel, QrError, Version};
|
||
|
||
#[test]
|
||
fn test_hello_world() {
|
||
let mut bits = Bits::new(Version::Normal(1));
|
||
assert_eq!(bits.push_alphanumeric_data(b"HELLO WORLD"), Ok(()));
|
||
assert_eq!(bits.push_terminator(EcLevel::Q), Ok(()));
|
||
assert_eq!(
|
||
bits.into_bytes(),
|
||
vec![
|
||
0b00100000, 0b01011011, 0b00001011, 0b01111000, 0b11010001, 0b01110010, 0b11011100, 0b01001101,
|
||
0b01000011, 0b01000000, 0b11101100, 0b00010001, 0b11101100,
|
||
]
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_too_long() {
|
||
let mut bits = Bits::new(Version::Micro(1));
|
||
assert_eq!(bits.push_numeric_data(b"9999999"), Ok(()));
|
||
assert_eq!(bits.push_terminator(EcLevel::L), Err(QrError::DataTooLong));
|
||
}
|
||
|
||
#[test]
|
||
fn test_no_terminator() {
|
||
let mut bits = Bits::new(Version::Micro(1));
|
||
assert_eq!(bits.push_numeric_data(b"99999"), Ok(()));
|
||
assert_eq!(bits.push_terminator(EcLevel::L), Ok(()));
|
||
assert_eq!(bits.into_bytes(), vec![0b101_11111, 0b00111_110, 0b0011__0000]);
|
||
}
|
||
|
||
#[test]
|
||
fn test_no_padding() {
|
||
let mut bits = Bits::new(Version::Micro(1));
|
||
assert_eq!(bits.push_numeric_data(b"9999"), Ok(()));
|
||
assert_eq!(bits.push_terminator(EcLevel::L), Ok(()));
|
||
assert_eq!(bits.into_bytes(), vec![0b100_11111, 0b00111_100, 0b1_000__0000]);
|
||
}
|
||
|
||
#[test]
|
||
fn test_micro_version_1_half_byte_padding() {
|
||
let mut bits = Bits::new(Version::Micro(1));
|
||
assert_eq!(bits.push_numeric_data(b"999"), Ok(()));
|
||
assert_eq!(bits.push_terminator(EcLevel::L), Ok(()));
|
||
assert_eq!(bits.into_bytes(), vec![0b011_11111, 0b00111_000, 0b0000__0000]);
|
||
}
|
||
|
||
#[test]
|
||
fn test_micro_version_1_full_byte_padding() {
|
||
let mut bits = Bits::new(Version::Micro(1));
|
||
assert_eq!(bits.push_numeric_data(b""), Ok(()));
|
||
assert_eq!(bits.push_terminator(EcLevel::L), Ok(()));
|
||
assert_eq!(bits.into_bytes(), vec![0b000_000_00, 0b11101100, 0]);
|
||
}
|
||
}
|
||
|
||
//}}}
|
||
//------------------------------------------------------------------------------
|
||
//{{{ Front end.
|
||
|
||
impl Bits {
|
||
/// Push a segmented data to the bits, and then terminate it.
|
||
pub fn push_segments<I>(&mut self, data: &[u8], segments_iter: I) -> QrResult<()>
|
||
where
|
||
I: Iterator<Item = Segment>,
|
||
{
|
||
for segment in segments_iter {
|
||
let slice = &data[segment.begin..segment.end];
|
||
match segment.mode {
|
||
Mode::Numeric => self.push_numeric_data(slice),
|
||
Mode::Alphanumeric => self.push_alphanumeric_data(slice),
|
||
Mode::Byte => self.push_byte_data(slice),
|
||
Mode::Kanji => self.push_kanji_data(slice),
|
||
}?;
|
||
}
|
||
Ok(())
|
||
}
|
||
|
||
/// Pushes the data the bits, using the optimal encoding.
|
||
pub fn push_optimal_data(&mut self, data: &[u8]) -> QrResult<()> {
|
||
let segments = Parser::new(data).optimize(self.version);
|
||
self.push_segments(data, segments)
|
||
}
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod encode_tests {
|
||
use crate::bits::Bits;
|
||
use crate::types::{EcLevel, QrError, QrResult, Version};
|
||
|
||
fn encode(data: &[u8], version: Version, ec_level: EcLevel) -> QrResult<Vec<u8>> {
|
||
let mut bits = Bits::new(version);
|
||
bits.push_optimal_data(data)?;
|
||
bits.push_terminator(ec_level)?;
|
||
Ok(bits.into_bytes())
|
||
}
|
||
|
||
#[test]
|
||
fn test_alphanumeric() {
|
||
let res = encode(b"HELLO WORLD", Version::Normal(1), EcLevel::Q);
|
||
assert_eq!(
|
||
res,
|
||
Ok(vec![
|
||
0b00100000, 0b01011011, 0b00001011, 0b01111000, 0b11010001, 0b01110010, 0b11011100, 0b01001101,
|
||
0b01000011, 0b01000000, 0b11101100, 0b00010001, 0b11101100,
|
||
])
|
||
);
|
||
}
|
||
|
||
#[test]
|
||
fn test_auto_mode_switch() {
|
||
let res = encode(b"123A", Version::Micro(2), EcLevel::L);
|
||
assert_eq!(res, Ok(vec![0b0_0011_000, 0b1111011_1, 0b001_00101, 0b0_00000__00, 0b11101100]));
|
||
}
|
||
|
||
#[test]
|
||
fn test_too_long() {
|
||
let res = encode(b">>>>>>>>", Version::Normal(1), EcLevel::H);
|
||
assert_eq!(res, Err(QrError::DataTooLong));
|
||
}
|
||
}
|
||
|
||
//}}}
|
||
//------------------------------------------------------------------------------
|
||
//{{{ Auto version minimization
|
||
|
||
/// Automatically determines the minimum version to store the data, and encode
|
||
/// the result.
|
||
///
|
||
/// This method will not consider any Micro QR code versions.
|
||
pub fn encode_auto(data: &[u8], ec_level: EcLevel) -> QrResult<Bits> {
|
||
let segments = Parser::new(data).collect::<Vec<Segment>>();
|
||
for version in &[Version::Normal(9), Version::Normal(26), Version::Normal(40)] {
|
||
let opt_segments = Optimizer::new(segments.iter().cloned(), *version).collect::<Vec<_>>();
|
||
let total_len = total_encoded_len(&*opt_segments, *version);
|
||
let data_capacity = version.fetch(ec_level, &DATA_LENGTHS).expect("invalid DATA_LENGTHS");
|
||
if total_len <= data_capacity {
|
||
let min_version = find_min_version(total_len, ec_level);
|
||
let mut bits = Bits::new(min_version);
|
||
bits.reserve(total_len);
|
||
bits.push_segments(data, opt_segments.into_iter())?;
|
||
bits.push_terminator(ec_level)?;
|
||
return Ok(bits);
|
||
}
|
||
}
|
||
Err(QrError::DataTooLong)
|
||
}
|
||
|
||
/// Finds the smallest version (QR code only) that can store N bits of data
|
||
/// in the given error correction level.
|
||
fn find_min_version(length: usize, ec_level: EcLevel) -> Version {
|
||
let mut base = 0_usize;
|
||
let mut size = 39;
|
||
while size > 1 {
|
||
let half = size / 2;
|
||
let mid = base + half;
|
||
// mid is always in [0, size).
|
||
// mid >= 0: by definition
|
||
// mid < size: mid = size / 2 + size / 4 + size / 8 ...
|
||
base = if DATA_LENGTHS[mid][ec_level as usize] > length { base } else { mid };
|
||
size -= half;
|
||
}
|
||
// base is always in [0, mid) because base <= mid.
|
||
base = if DATA_LENGTHS[base][ec_level as usize] >= length { base } else { base + 1 };
|
||
Version::Normal((base + 1).as_i16())
|
||
}
|
||
|
||
#[cfg(test)]
|
||
mod encode_auto_tests {
|
||
use crate::bits::{encode_auto, find_min_version};
|
||
use crate::types::{EcLevel, Version};
|
||
|
||
#[test]
|
||
fn test_find_min_version() {
|
||
assert_eq!(find_min_version(60, EcLevel::L), Version::Normal(1));
|
||
assert_eq!(find_min_version(200, EcLevel::L), Version::Normal(2));
|
||
assert_eq!(find_min_version(200, EcLevel::H), Version::Normal(3));
|
||
assert_eq!(find_min_version(20000, EcLevel::L), Version::Normal(37));
|
||
assert_eq!(find_min_version(640, EcLevel::L), Version::Normal(4));
|
||
assert_eq!(find_min_version(641, EcLevel::L), Version::Normal(5));
|
||
assert_eq!(find_min_version(999999, EcLevel::H), Version::Normal(40));
|
||
}
|
||
|
||
#[test]
|
||
fn test_alpha_q() {
|
||
let bits = encode_auto(b"HELLO WORLD", EcLevel::Q).unwrap();
|
||
assert_eq!(bits.version(), Version::Normal(1));
|
||
}
|
||
|
||
#[test]
|
||
fn test_alpha_h() {
|
||
let bits = encode_auto(b"HELLO WORLD", EcLevel::H).unwrap();
|
||
assert_eq!(bits.version(), Version::Normal(2));
|
||
}
|
||
|
||
#[test]
|
||
fn test_mixed() {
|
||
let bits = encode_auto(b"This is a mixed data test. 1234567890", EcLevel::H).unwrap();
|
||
assert_eq!(bits.version(), Version::Normal(4));
|
||
}
|
||
}
|
||
|
||
#[cfg(feature = "bench")]
|
||
#[bench]
|
||
fn bench_find_min_version(bencher: &mut test::Bencher) {
|
||
use test::black_box;
|
||
|
||
bencher.iter(|| {
|
||
black_box(find_min_version(60, EcLevel::L));
|
||
black_box(find_min_version(200, EcLevel::L));
|
||
black_box(find_min_version(200, EcLevel::H));
|
||
black_box(find_min_version(20000, EcLevel::L));
|
||
black_box(find_min_version(640, EcLevel::L));
|
||
black_box(find_min_version(641, EcLevel::L));
|
||
black_box(find_min_version(999999, EcLevel::H));
|
||
})
|
||
}
|
||
|
||
//}}}
|
||
//------------------------------------------------------------------------------
|