tuv 0.1.6

Pure-Rust QR code encoder with SVG and PNG output
Documentation 
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//! Micro QR block capacity and codeword construction via `Version::fetch` tables.

use crate::error_correction::{generate_ecc, interleave, DataBlock, ECCLevel};
use crate::types::{QRGenError, Version};

type DataBlockRow = (usize, usize, usize, usize);

pub(crate) static EC_BYTES_PER_BLOCK: [[usize; 4]; 44] = [
    [7, 10, 13, 17],
    [10, 16, 22, 28],
    [15, 26, 18, 22],
    [20, 18, 26, 16],
    [26, 24, 18, 22],
    [18, 16, 24, 28],
    [20, 18, 18, 26],
    [24, 22, 22, 26],
    [30, 22, 20, 24],
    [18, 26, 24, 28],
    [20, 30, 28, 24],
    [24, 22, 26, 28],
    [26, 22, 24, 22],
    [30, 24, 20, 24],
    [22, 24, 30, 24],
    [24, 28, 24, 30],
    [28, 26, 28, 28],
    [30, 26, 28, 28],
    [28, 26, 26, 26],
    [28, 26, 30, 28],
    [28, 28, 30, 24],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [26, 28, 30, 30],
    [28, 28, 28, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [30, 28, 30, 30],
    [2, 0, 0, 0],
    [5, 6, 0, 0],
    [6, 8, 0, 0],
    [8, 10, 14, 0],
];

pub(crate) static DATA_BYTES_PER_BLOCK: [[DataBlockRow; 4]; 44] = [
    [(19, 1, 0, 0), (16, 1, 0, 0), (13, 1, 0, 0), (9, 1, 0, 0)],
    [(34, 1, 0, 0), (28, 1, 0, 0), (22, 1, 0, 0), (16, 1, 0, 0)],
    [(55, 1, 0, 0), (44, 1, 0, 0), (17, 2, 0, 0), (13, 2, 0, 0)],
    [(80, 1, 0, 0), (32, 2, 0, 0), (24, 2, 0, 0), (9, 4, 0, 0)],
    [(108, 1, 0, 0), (43, 2, 0, 0), (15, 2, 16, 2), (11, 2, 12, 2)],
    [(68, 2, 0, 0), (27, 4, 0, 0), (19, 4, 0, 0), (15, 4, 0, 0)],
    [(78, 2, 0, 0), (31, 4, 0, 0), (14, 2, 15, 4), (13, 4, 14, 1)],
    [(97, 2, 0, 0), (38, 2, 39, 2), (18, 4, 19, 2), (14, 4, 15, 2)],
    [(116, 2, 0, 0), (36, 3, 37, 2), (16, 4, 17, 4), (12, 4, 13, 4)],
    [(68, 2, 69, 2), (43, 4, 44, 1), (19, 6, 20, 2), (15, 6, 16, 2)],
    [(81, 4, 0, 0), (50, 1, 51, 4), (22, 4, 23, 4), (12, 3, 13, 8)],
    [(92, 2, 93, 2), (36, 6, 37, 2), (20, 4, 21, 6), (14, 7, 15, 4)],
    [(107, 4, 0, 0), (37, 8, 38, 1), (20, 8, 21, 4), (11, 12, 12, 4)],
    [(115, 3, 116, 1), (40, 4, 41, 5), (16, 11, 17, 5), (12, 11, 13, 5)],
    [(87, 5, 88, 1), (41, 5, 42, 5), (24, 5, 25, 7), (12, 11, 13, 7)],
    [(98, 5, 99, 1), (45, 7, 46, 3), (19, 15, 20, 2), (15, 3, 16, 13)],
    [(107, 1, 108, 5), (46, 10, 47, 1), (22, 1, 23, 15), (14, 2, 15, 17)],
    [(120, 5, 121, 1), (43, 9, 44, 4), (22, 17, 23, 1), (14, 2, 15, 19)],
    [(113, 3, 114, 4), (44, 3, 45, 11), (21, 17, 22, 4), (13, 9, 14, 16)],
    [(107, 3, 108, 5), (41, 3, 42, 13), (24, 15, 25, 5), (15, 15, 16, 10)],
    [(116, 4, 117, 4), (42, 17, 0, 0), (22, 17, 23, 6), (16, 19, 17, 6)],
    [(111, 2, 112, 7), (46, 17, 0, 0), (24, 7, 25, 16), (13, 34, 0, 0)],
    [(121, 4, 122, 5), (47, 4, 48, 14), (24, 11, 25, 14), (15, 16, 16, 14)],
    [(117, 6, 118, 4), (45, 6, 46, 14), (24, 11, 25, 16), (16, 30, 17, 2)],
    [(106, 8, 107, 4), (47, 8, 48, 13), (24, 7, 25, 22), (15, 22, 16, 13)],
    [(114, 10, 115, 2), (46, 19, 47, 4), (22, 28, 23, 6), (16, 33, 17, 4)],
    [(122, 8, 123, 4), (45, 22, 46, 3), (23, 8, 24, 26), (15, 12, 16, 28)],
    [(117, 3, 118, 10), (45, 3, 46, 23), (24, 4, 25, 31), (15, 11, 16, 31)],
    [(116, 7, 117, 7), (45, 21, 46, 7), (23, 1, 24, 37), (15, 19, 16, 26)],
    [(115, 5, 116, 10), (47, 19, 48, 10), (24, 15, 25, 25), (15, 23, 16, 25)],
    [(115, 13, 116, 3), (46, 2, 47, 29), (24, 42, 25, 1), (15, 23, 16, 28)],
    [(115, 17, 0, 0), (46, 10, 47, 23), (24, 10, 25, 35), (15, 19, 16, 35)],
    [(115, 17, 116, 1), (46, 14, 47, 21), (24, 29, 25, 19), (15, 11, 16, 46)],
    [(115, 13, 116, 6), (46, 14, 47, 23), (24, 44, 25, 7), (16, 59, 17, 1)],
    [(121, 12, 122, 7), (47, 12, 48, 26), (24, 39, 25, 14), (15, 22, 16, 41)],
    [(121, 6, 122, 14), (47, 6, 48, 34), (24, 46, 25, 10), (15, 2, 16, 64)],
    [(122, 17, 123, 4), (46, 29, 47, 14), (24, 49, 25, 10), (15, 24, 16, 46)],
    [(122, 4, 123, 18), (46, 13, 47, 32), (24, 48, 25, 14), (15, 42, 16, 32)],
    [(117, 20, 118, 4), (47, 40, 48, 7), (24, 43, 25, 22), (15, 10, 16, 67)],
    [(118, 19, 119, 6), (47, 18, 48, 31), (24, 34, 25, 34), (15, 20, 16, 61)],
    [(3, 1, 0, 0), (0, 0, 0, 0), (0, 0, 0, 0), (0, 0, 0, 0)],
    [(5, 1, 0, 0), (4, 1, 0, 0), (0, 0, 0, 0), (0, 0, 0, 0)],
    [(11, 1, 0, 0), (9, 1, 0, 0), (0, 0, 0, 0), (0, 0, 0, 0)],
    [(16, 1, 0, 0), (14, 1, 0, 0), (10, 1, 0, 0), (0, 0, 0, 0)],
];

/// Total data codewords for a Micro QR `(version, ecc)` pair.
pub fn total_data_codewords(version: u8, ecc: ECCLevel) -> Result<usize, QRGenError> {
    let (block_1_size, block_1_count, block_2_size, block_2_count) =
        Version::Micro(i16::from(version)).fetch(ecc, &DATA_BYTES_PER_BLOCK)?;
    Ok(block_1_size * block_1_count + block_2_size * block_2_count)
}

/// Split padded data into blocks, compute RS ECC, return `(data_interleaved, ec_interleaved)`.
pub fn construct_codewords(
    rawbits: &[u8],
    version: u8,
    ecc: ECCLevel,
) -> Result<(Vec<u8>, Vec<u8>), QRGenError> {
    let ver = Version::Micro(i16::from(version));
    let (block_1_size, block_1_count, block_2_size, block_2_count) =
        ver.fetch(ecc, &DATA_BYTES_PER_BLOCK)?;
    let ec_bytes = ver.fetch(ecc, &EC_BYTES_PER_BLOCK)?;

    let total_size = total_data_codewords(version, ecc)?;
    debug_assert_eq!(rawbits.len(), total_size);
    let block_1_end = block_1_size * block_1_count;

    let mut blocks: Vec<&[u8]> = Vec::new();
    blocks.extend(rawbits[..block_1_end].chunks(block_1_size));
    if block_2_size > 0 {
        debug_assert_eq!(block_2_count as usize, rawbits[block_1_end..].len() / block_2_size);
        blocks.extend(rawbits[block_1_end..].chunks(block_2_size));
    }

    let mut data_blocks = Vec::with_capacity(blocks.len());
    for block in blocks {
        let ecc_codewords = generate_ecc(block, ec_bytes);
        data_blocks.push(DataBlock {
            data: block.to_vec(),
            ecc: ecc_codewords,
        });
    }

    let interleaved = interleave(&data_blocks);
    let data_len: usize = data_blocks.iter().map(|b| b.data.len()).sum();
    let data = interleaved[..data_len].to_vec();
    let ec = interleaved[data_len..].to_vec();
    Ok((data, ec))
}