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QR-Code-generator
mirror of https://github.com/nayuki/QR-Code-generator
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Tweaked comments in Rust code to convert all public members to real documentation comments.

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Project Nayuki 6 years ago
parent 2f77345d24
commit 4b6e151955
1 changed files with 99 additions and 99 deletions
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rust/src/lib.rs
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@ -24,23 +24,21 @@
/*---- QrCode functionality ----*/
/*
* A QR Code symbol, which is a type of two-dimension barcode.
* Invented by Denso Wave and described in the ISO/IEC 18004 standard.
* Instances of this struct represent an immutable square grid of black and white cells.
* The impl provides static factory functions to create a QR Code from text or binary data.
* The struct and impl cover the QR Code Model 2 specification, supporting all versions
* (sizes) from 1 to 40, all 4 error correction levels, and 4 character encoding modes.
*
* Ways to create a QR Code object:
* - High level: Take the payload data and call QrCode::encode_text() or QrCode::encode_binary().
* - Mid level: Custom-make the list of segments and call
* QrCode.encode_segments() or QrCode.encode_segments_advanced().
* - Low level: Custom-make the array of data codeword bytes (including segment
* headers and final padding, excluding error correction codewords), supply the
* appropriate version number, and call the QrCode::encode_codewords() constructor.
* (Note that all ways require supplying the desired error correction level.)
*/
/// A QR Code symbol, which is a type of two-dimension barcode.
/// Invented by Denso Wave and described in the ISO/IEC 18004 standard.
/// Instances of this struct represent an immutable square grid of black and white cells.
/// The impl provides static factory functions to create a QR Code from text or binary data.
/// The struct and impl cover the QR Code Model 2 specification, supporting all versions
/// (sizes) from 1 to 40, all 4 error correction levels, and 4 character encoding modes.
///
/// Ways to create a QR Code object:
/// - High level: Take the payload data and call QrCode::encode_text() or QrCode::encode_binary().
/// - Mid level: Custom-make the list of segments and call
/// QrCode.encode_segments() or QrCode.encode_segments_advanced().
/// - Low level: Custom-make the array of data codeword bytes (including segment
/// headers and final padding, excluding error correction codewords), supply the
/// appropriate version number, and call the QrCode::encode_codewords() constructor.
/// (Note that all ways require supplying the desired error correction level.)
#[derive(Clone)]
pub struct QrCode {
@ -78,12 +76,12 @@ impl QrCode {
/*---- Static factory functions (high level) ----*/
// Returns a QR Code representing the given Unicode text string at the given error correction level.
// As a conservative upper bound, this function is guaranteed to succeed for strings that have 738 or fewer Unicode
// code points (not UTF-8 code units) if the low error correction level is used. The smallest possible
// QR Code version is automatically chosen for the output. The ECC level of the result may be higher than
// the ecl argument if it can be done without increasing the version. Returns a wrapped QrCode if successful,
// or None if the data is too long to fit in any version at the given ECC level.
/// Returns a QR Code representing the given Unicode text string at the given error correction level.
/// As a conservative upper bound, this function is guaranteed to succeed for strings that have 738 or fewer Unicode
/// code points (not UTF-8 code units) if the low error correction level is used. The smallest possible
/// QR Code version is automatically chosen for the output. The ECC level of the result may be higher than
/// the ecl argument if it can be done without increasing the version. Returns a wrapped QrCode if successful,
/// or None if the data is too long to fit in any version at the given ECC level.
pub fn encode_text(text: &str, ecl: QrCodeEcc) -> Option<Self> {
let chrs: Vec<char> = text.chars().collect();
let segs: Vec<QrSegment> = QrSegment::make_segments(&chrs);
@ -91,11 +89,11 @@ impl QrCode {
}
// Returns a QR Code representing the given binary data at the given error correction level.
// This function always encodes using the binary segment mode, not any text mode. The maximum number of
// bytes allowed is 2953. The smallest possible QR Code version is automatically chosen for the output.
// The ECC level of the result may be higher than the ecl argument if it can be done without increasing the version.
// Returns a wrapped QrCode if successful, or None if the data is too long to fit in any version at the given ECC level.
/// Returns a QR Code representing the given binary data at the given error correction level.
/// This function always encodes using the binary segment mode, not any text mode. The maximum number of
/// bytes allowed is 2953. The smallest possible QR Code version is automatically chosen for the output.
/// The ECC level of the result may be higher than the ecl argument if it can be done without increasing the version.
/// Returns a wrapped QrCode if successful, or None if the data is too long to fit in any version at the given ECC level.
pub fn encode_binary(data: &[u8], ecl: QrCodeEcc) -> Option<Self> {
let segs: Vec<QrSegment> = vec![QrSegment::make_bytes(data)];
QrCode::encode_segments(&segs, ecl)
@ -104,29 +102,29 @@ impl QrCode {
/*---- Static factory functions (mid level) ----*/
// Returns a QR Code representing the given segments at the given error correction level.
// The smallest possible QR Code version is automatically chosen for the output. The ECC level
// of the result may be higher than the ecl argument if it can be done without increasing the version.
// This function allows the user to create a custom sequence of segments that switches
// between modes (such as alphanumeric and byte) to encode text in less space.
// This is a mid-level API; the high-level API is encode_text() and encode_binary().
// Returns a wrapped QrCode if successful, or None if the data is too long to fit in any version at the given ECC level.
/// Returns a QR Code representing the given segments at the given error correction level.
/// The smallest possible QR Code version is automatically chosen for the output. The ECC level
/// of the result may be higher than the ecl argument if it can be done without increasing the version.
/// This function allows the user to create a custom sequence of segments that switches
/// between modes (such as alphanumeric and byte) to encode text in less space.
/// This is a mid-level API; the high-level API is encode_text() and encode_binary().
/// Returns a wrapped QrCode if successful, or None if the data is too long to fit in any version at the given ECC level.
pub fn encode_segments(segs: &[QrSegment], ecl: QrCodeEcc) -> Option<Self> {
QrCode::encode_segments_advanced(segs, ecl, QrCode_MIN_VERSION, QrCode_MAX_VERSION, None, true)
}
// Returns a QR Code representing the given segments with the given encoding parameters.
// The smallest possible QR Code version within the given range is automatically
// chosen for the output. Iff boostecl is true, then the ECC level of the result
// may be higher than the ecl argument if it can be done without increasing the
// version. The mask number is either between 0 to 7 (inclusive) to force that
// mask, or -1 to automatically choose an appropriate mask (which may be slow).
// This function allows the user to create a custom sequence of segments that switches
// between modes (such as alphanumeric and byte) to encode text in less space.
// This is a mid-level API; the high-level API is encodeText() and encodeBinary().
// Returns a wrapped QrCode if successful, or None if the data is too long to fit
// in any version in the given range at the given ECC level.
/// Returns a QR Code representing the given segments with the given encoding parameters.
/// The smallest possible QR Code version within the given range is automatically
/// chosen for the output. Iff boostecl is true, then the ECC level of the result
/// may be higher than the ecl argument if it can be done without increasing the
/// version. The mask number is either between 0 to 7 (inclusive) to force that
/// mask, or -1 to automatically choose an appropriate mask (which may be slow).
/// This function allows the user to create a custom sequence of segments that switches
/// between modes (such as alphanumeric and byte) to encode text in less space.
/// This is a mid-level API; the high-level API is encodeText() and encodeBinary().
/// Returns a wrapped QrCode if successful, or None if the data is too long to fit
/// in any version in the given range at the given ECC level.
pub fn encode_segments_advanced(segs: &[QrSegment], mut ecl: QrCodeEcc,
minversion: Version, maxversion: Version, mask: Option<Mask>, boostecl: bool) -> Option<Self> {
assert!(minversion.value() <= maxversion.value(), "Invalid value");
@ -195,10 +193,10 @@ impl QrCode {
/*---- Constructor (low level) ----*/
// Creates a new QR Code with the given version number,
// error correction level, data codeword bytes, and mask number.
// This is a low-level API that most users should not use directly.
// A mid-level API is the encode_segments() function.
/// Creates a new QR Code with the given version number,
/// error correction level, data codeword bytes, and mask number.
/// This is a low-level API that most users should not use directly.
/// A mid-level API is the encode_segments() function.
pub fn encode_codewords(ver: Version, ecl: QrCodeEcc, datacodewords: &[u8], mask: Option<Mask>) -> Self {
// Initialize fields
let size: usize = (ver.value() as usize) * 4 + 17;
@ -224,33 +222,33 @@ impl QrCode {
/*---- Public methods ----*/
// Returns this QR Code's version, in the range [1, 40].
/// Returns this QR Code's version, in the range [1, 40].
pub fn version(&self) -> Version {
self.version
}
// Returns this QR Code's size, in the range [21, 177].
/// Returns this QR Code's size, in the range [21, 177].
pub fn size(&self) -> i32 {
self.size
}
// Returns this QR Code's error correction level.
/// Returns this QR Code's error correction level.
pub fn error_correction_level(&self) -> QrCodeEcc {
self.errorcorrectionlevel
}
// Returns this QR Code's mask, in the range [0, 7].
/// Returns this QR Code's mask, in the range [0, 7].
pub fn mask(&self) -> Mask {
self.mask
}
// Returns the color of the module (pixel) at the given coordinates, which is false
// for white or true for black. The top left corner has the coordinates (x=0, y=0).
// If the given coordinates are out of bounds, then false (white) is returned.
/// Returns the color of the module (pixel) at the given coordinates, which is false
/// for white or true for black. The top left corner has the coordinates (x=0, y=0).
/// If the given coordinates are out of bounds, then false (white) is returned.
pub fn get_module(&self, x: i32, y: i32) -> bool {
0 <= x && x < self.size && 0 <= y && y < self.size && self.module(x, y)
}
@ -268,8 +266,8 @@ impl QrCode {
}
// Returns a string of SVG code for an image depicting this QR Code, with the given number
// of border modules. The string always uses Unix newlines (\n), regardless of the platform.
/// Returns a string of SVG code for an image depicting this QR Code, with the given number
/// of border modules. The string always uses Unix newlines (\n), regardless of the platform.
pub fn to_svg_string(&self, border: i32) -> String {
assert!(border >= 0, "Border must be non-negative");
let mut result = String::new();
@ -702,10 +700,10 @@ impl QrCode {
/*---- Cconstants and tables ----*/
// The minimum version number supported in the QR Code Model 2 standard.
/// The minimum version number supported in the QR Code Model 2 standard.
pub const QrCode_MIN_VERSION: Version = Version( 1);
// The maximum version number supported in the QR Code Model 2 standard.
/// The maximum version number supported in the QR Code Model 2 standard.
pub const QrCode_MAX_VERSION: Version = Version(40);
@ -738,13 +736,17 @@ static NUM_ERROR_CORRECTION_BLOCKS: [[i8; 41]; 4] = [
/*---- QrCodeEcc functionality ----*/
// The error correction level in a QR Code symbol.
/// The error correction level in a QR Code symbol.
#[derive(Clone, Copy)]
pub enum QrCodeEcc {
Low , // The QR Code can tolerate about 7% erroneous codewords
Medium , // The QR Code can tolerate about 15% erroneous codewords
Quartile, // The QR Code can tolerate about 25% erroneous codewords
High , // The QR Code can tolerate about 30% erroneous codewords
/// The QR Code can tolerate about 7% erroneous codewords
Low ,
/// The QR Code can tolerate about 15% erroneous codewords
Medium ,
/// The QR Code can tolerate about 25% erroneous codewords
Quartile,
/// The QR Code can tolerate about 30% erroneous codewords
High ,
}
@ -852,17 +854,15 @@ impl ReedSolomonGenerator {
/*---- QrSegment functionality ----*/
/*
* A segment of character/binary/control data in a QR Code symbol.
* Instances of this struct are immutable.
* The mid-level way to create a segment is to take the payload data
* and call a static factory function such as QrSegment::make_numeric().
* The low-level way to create a segment is to custom-make the bit buffer
* and call the QrSegment::new() constructor with appropriate values.
* This segment struct imposes no length restrictions, but QR Codes have restrictions.
* Even in the most favorable conditions, a QR Code can only hold 7089 characters of data.
* Any segment longer than this is meaningless for the purpose of generating QR Codes.
*/
/// A segment of character/binary/control data in a QR Code symbol.
/// Instances of this struct are immutable.
/// The mid-level way to create a segment is to take the payload data
/// and call a static factory function such as QrSegment::make_numeric().
/// The low-level way to create a segment is to custom-make the bit buffer
/// and call the QrSegment::new() constructor with appropriate values.
/// This segment struct imposes no length restrictions, but QR Codes have restrictions.
/// Even in the most favorable conditions, a QR Code can only hold 7089 characters of data.
/// Any segment longer than this is meaningless for the purpose of generating QR Codes.
#[derive(Clone)]
pub struct QrSegment {
@ -884,9 +884,9 @@ impl QrSegment {
/*---- Static factory functions (mid level) ----*/
// Returns a segment representing the given binary data encoded in
// byte mode. All input byte slices are acceptable. Any text string
// can be converted to UTF-8 bytes and encoded as a byte mode segment.
/// Returns a segment representing the given binary data encoded in
/// byte mode. All input byte slices are acceptable. Any text string
/// can be converted to UTF-8 bytes and encoded as a byte mode segment.
pub fn make_bytes(data: &[u8]) -> Self {
let mut bb = BitBuffer(Vec::with_capacity(data.len() * 8));
for b in data {
@ -896,8 +896,8 @@ impl QrSegment {
}
// Returns a segment representing the given string of decimal digits encoded in numeric mode.
// Panics if the string contains non-digit characters.
/// Returns a segment representing the given string of decimal digits encoded in numeric mode.
/// Panics if the string contains non-digit characters.
pub fn make_numeric(text: &[char]) -> Self {
let mut bb = BitBuffer(Vec::with_capacity(text.len() * 3 + (text.len() + 2) / 3));
let mut accumdata: u32 = 0;
@ -919,9 +919,9 @@ impl QrSegment {
}
// Returns a segment representing the given text string encoded in alphanumeric mode.
// The characters allowed are: 0 to 9, A to Z (uppercase only), space, dollar, percent, asterisk,
// plus, hyphen, period, slash, colon. Panics if the string contains non-encodable characters.
/// Returns a segment representing the given text string encoded in alphanumeric mode.
/// The characters allowed are: 0 to 9, A to Z (uppercase only), space, dollar, percent, asterisk,
/// plus, hyphen, period, slash, colon. Panics if the string contains non-encodable characters.
pub fn make_alphanumeric(text: &[char]) -> Self {
let mut bb = BitBuffer(Vec::with_capacity(text.len() * 5 + (text.len() + 1) / 2));
let mut accumdata: u32 = 0;
@ -944,8 +944,8 @@ impl QrSegment {
}
// Returns a list of zero or more segments to represent the given Unicode text string. The result
// may use various segment modes and switch modes to optimize the length of the bit stream.
/// Returns a list of zero or more segments to represent the given Unicode text string. The result
/// may use various segment modes and switch modes to optimize the length of the bit stream.
pub fn make_segments(text: &[char]) -> Vec<Self> {
if text.is_empty() {
vec![]
@ -960,8 +960,8 @@ impl QrSegment {
}
// Returns a segment representing an Extended Channel Interpretation
// (ECI) designator with the given assignment value.
/// Returns a segment representing an Extended Channel Interpretation
/// (ECI) designator with the given assignment value.
pub fn make_eci(assignval: u32) -> Self {
let mut bb = BitBuffer(Vec::with_capacity(24));
if assignval < (1 << 7) {
@ -981,9 +981,9 @@ impl QrSegment {
/*---- Constructor (low level) ----*/
// Creates a new QR Code segment with the given attributes and data.
// The character count (numchars) must agree with the mode and
// the bit buffer length, but the constraint isn't checked.
/// Creates a new QR Code segment with the given attributes and data.
/// The character count (numchars) must agree with the mode and
/// the bit buffer length, but the constraint isn't checked.
pub fn new(mode: QrSegmentMode, numchars: usize, data: Vec<bool>) -> Self {
Self {
mode: mode,
@ -995,19 +995,19 @@ impl QrSegment {
/*---- Instance field getters ----*/
// Returns the mode indicator of this segment.
/// Returns the mode indicator of this segment.
pub fn mode(&self) -> QrSegmentMode {
self.mode
}
// Returns the character count field of this segment.
/// Returns the character count field of this segment.
pub fn num_chars(&self) -> usize {
self.numchars
}
// Returns the data bits of this segment.
/// Returns the data bits of this segment.
pub fn data(&self) -> &Vec<bool> {
&self.data
}
@ -1061,7 +1061,7 @@ static ALPHANUMERIC_CHARSET: [char; 45] = ['0','1','2','3','4','5','6','7','8','
/*---- QrSegmentMode functionality ----*/
// Describes how a segment's data bits are interpreted.
/// Describes how a segment's data bits are interpreted.
#[derive(Clone, Copy)]
pub enum QrSegmentMode {
Numeric,
@ -1107,13 +1107,13 @@ impl QrSegmentMode {
/*---- Bit buffer functionality ----*/
// An appendable sequence of bits (0s and 1s). Mainly used by QrSegment.
/// An appendable sequence of bits (0s and 1s). Mainly used by QrSegment.
pub struct BitBuffer(pub Vec<bool>);
impl BitBuffer {
// Appends the given number of low-order bits of the given value
// to this buffer. Requires len <= 31 and val < 2^len.
/// Appends the given number of low-order bits of the given value
/// to this buffer. Requires len <= 31 and val < 2^len.
pub fn append_bits(&mut self, val: u32, len: u8) {
assert!(len <= 31 && (val >> len) == 0, "Value out of range");
self.0.extend((0 .. len as i32).rev().map(|i| get_bit(val, i))); // Append bit by bit

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