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no red lines in readsolomon.rs

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This commit is contained in:
Henry Schimke
2022-08-15 15:22:35 -05:00
parent ef13820a06
commit a5e6fe77e4
2 changed files with 78 additions and 77 deletions
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153
src/common/readsolomon.rs
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@@ -10,9 +10,9 @@
*/
struct GenericGFPoly {
let field: GenericGF;
field: GenericGF,
let coefficients: Vec<i32>;
coefficients: Vec<i32>
}
impl GenericGFPoly {
@@ -26,11 +26,12 @@ impl GenericGFPoly {
* or if leading coefficient is 0 and this is not a
* constant polynomial (that is, it is not the monomial "0")
*/
fn new( field: &GenericGF, coefficients: &Vec<i32>) -> GenericGFPoly {
if coefficients.len() == 0 {
throw IllegalArgumentException::new();
fn new( field: &GenericGF, coefficients: &Vec<i32>) -> Result<Self,IllegalArgumentException> {
let mut new_poly: GenericGFPoly;
if coefficients.len() == 0 {
return Err(IllegalArgumentException::new());
}
let .field = field;
new_poly.field = field;
let coefficients_length: i32 = coefficients.len();
if coefficients_length > 1 && coefficients[0] == 0 {
// Leading term must be non-zero for anything except the constant polynomial "0"
@@ -39,15 +40,15 @@ impl GenericGFPoly {
first_non_zero += 1;
}
if first_non_zero == coefficients_length {
let .coefficients = : vec![i32; 1] = vec![0, ]
;
new_poly.coefficients = vec![0, ];
} else {
let .coefficients = : [i32; coefficients_length - first_non_zero] = [0; coefficients_length - first_non_zero];
System::arraycopy(&coefficients, first_non_zero, let .coefficients, 0, let .coefficients.len());
new_poly.coefficients = coefficients;
//System::arraycopy(&coefficients, first_non_zero, let .coefficients, 0, let .coefficients.len());
}
} else {
let .coefficients = coefficients;
new_poly.coefficients = coefficients;
}
Ok(new_poly)
}
fn get_coefficients(&self) -> Vec<i32> {
@@ -86,7 +87,7 @@ impl GenericGFPoly {
if a == 1 {
// Just the sum of the coefficients
let mut result: i32 = 0;
for let coefficient: i32 in self.coefficients {
for coefficient in self.coefficients {
result = GenericGF::add_or_subtract(result, coefficient);
}
return result;
@@ -106,9 +107,9 @@ impl GenericGFPoly {
return result;
}
fn add_or_subtract(&self, other: &GenericGFPoly) -> GenericGFPoly {
fn add_or_subtract(&self, other: &GenericGFPoly) -> Result<GenericGFPoly,IllegalArgumentException> {
if !self.field.equals(other.field) {
throw IllegalArgumentException::new("GenericGFPolys do not have same GenericGF field");
return Err( IllegalArgumentException::new("GenericGFPolys do not have same GenericGF field") );
}
if self.is_zero() {
return other;
@@ -140,9 +141,9 @@ impl GenericGFPoly {
return GenericGFPoly::new(self.field, &sum_diff);
}
fn multiply(&self, other: &GenericGFPoly) -> GenericGFPoly {
fn multiply(&self, other: &GenericGFPoly) -> Result<GenericGFPoly,IllegalArgumentException> {
if !self.field.equals(other.field) {
throw IllegalArgumentException::new("GenericGFPolys do not have same GenericGF field");
return Err(IllegalArgumentException::new("GenericGFPolys do not have same GenericGF field"));
}
if self.is_zero() || other.is_zero() {
return self.field.get_zero();
@@ -197,9 +198,9 @@ impl GenericGFPoly {
return GenericGFPoly::new(self.field, &product);
}
fn multiply_by_monomial(&self, degree: i32, coefficient: i32) -> GenericGFPoly {
fn multiply_by_monomial(&self, degree: i32, coefficient: i32) -> Result<GenericGFPoly,IllegalArgumentException> {
if degree < 0 {
throw IllegalArgumentException::new();
return Err( IllegalArgumentException::new());
}
if coefficient == 0 {
return self.field.get_zero();
@@ -219,12 +220,12 @@ impl GenericGFPoly {
return GenericGFPoly::new(self.field, &product);
}
fn divide(&self, other: &GenericGFPoly) -> Vec<GenericGFPoly> {
fn divide(&self, other: &GenericGFPoly) -> Result<Vec<GenericGFPoly>,IllegalArgumentException> {
if !self.field.equals(other.field) {
throw IllegalArgumentException::new("GenericGFPolys do not have same GenericGF field");
return Err( IllegalArgumentException::new("GenericGFPolys do not have same GenericGF field"));
}
if other.is_zero() {
throw IllegalArgumentException::new("Divide by 0");
return Err( IllegalArgumentException::new("Divide by 0"));
}
let mut quotient: GenericGFPoly = self.field.get_zero();
let mut remainder: GenericGFPoly = self;
@@ -238,7 +239,7 @@ impl GenericGFPoly {
quotient = quotient.add_or_subtract(iteration_quotient);
remainder = remainder.add_or_subtract(term);
}
return : vec![GenericGFPoly; 2] = vec![quotient, remainder, ]
return vec![quotient, remainder, ]
;
}
@@ -328,21 +329,22 @@ const AZTEC_DATA_12: GenericGF = GenericGF::new(0x1069, 4096, 1);
const AZTEC_DATA_8: GenericGF = DATA_MATRIX_FIELD_256;
const MAXICODE_FIELD_64: GenericGF = AZTEC_DATA_6;
pub struct GenericGF {
let exp_table: Vec<i32>;
exp_table: Vec<i32>,
let log_table: Vec<i32>;
log_table: Vec<i32>,
let mut zero: GenericGFPoly;
zero: GenericGFPoly,
let mut one: GenericGFPoly;
one: GenericGFPoly,
let size: i32;
size: i32,
let primitive: i32;
primitive: i32,
let generator_base: i32;
generator_base: i32
}
impl GenericGF {
@@ -358,12 +360,13 @@ impl GenericGF {
* (g(x) = (x+a^b)(x+a^(b+1))...(x+a^(b+2t-1))).
* In most cases it should be 1, but for QR code it is 0.
*/
pub fn new( primitive: i32, size: i32, b: i32) -> GenericGF {
let .primitive = primitive;
let .size = size;
let .generatorBase = b;
exp_table = : [i32; size] = [0; size];
log_table = : [i32; size] = [0; size];
pub fn new( primitive: i32, size: i32, b: i32) -> Self {
let mut new_generic_gf : GenericGF;
new_generic_gf .primitive = primitive;
new_generic_gf .size = size;
new_generic_gf .generatorBase = b;
exp_table = [0; size];
log_table = [0; size];
let mut x: i32 = 1;
{
let mut i: i32 = 0;
@@ -392,10 +395,10 @@ impl GenericGF {
}
// logTable[0] == 0 but this should never be used
zero = GenericGFPoly::new(let , : vec![i32; 1] = vec![0, ]
);
one = GenericGFPoly::new(let , : vec![i32; 1] = vec![1, ]
);
new_generic_gf.zero = GenericGFPoly::new( vec![0, ]);
new_generic_gf.one = GenericGFPoly::new( vec![1, ]);
new_generic_gf
}
fn get_zero(&self) -> GenericGFPoly {
@@ -409,9 +412,9 @@ impl GenericGF {
/**
* @return the monomial representing coefficient * x^degree
*/
fn build_monomial(&self, degree: i32, coefficient: i32) -> GenericGFPoly {
fn build_monomial(&self, degree: i32, coefficient: i32) -> Result<GenericGFPoly,IllegalArgumentException> {
if degree < 0 {
throw IllegalArgumentException::new();
return Err( IllegalArgumentException::new());
}
if coefficient == 0 {
return self.zero;
@@ -440,9 +443,9 @@ impl GenericGF {
/**
* @return base 2 log of a in GF(size)
*/
fn log(&self, a: i32) -> i32 {
fn log(&self, a: i32) -> Result<i32,IllegalArgumentException> {
if a == 0 {
throw IllegalArgumentException::new();
return Err( IllegalArgumentException::new());
}
return self.log_table[a];
}
@@ -450,9 +453,9 @@ impl GenericGF {
/**
* @return multiplicative inverse of a
*/
fn inverse(&self, a: i32) -> i32 {
fn inverse(&self, a: i32) -> Result<i32,ArithmeticException> {
if a == 0 {
throw ArithmeticException::new();
return Err( ArithmeticException::new());
}
return self.exp_table[self.size - self.log_table[a] - 1];
}
@@ -505,13 +508,13 @@ impl GenericGF {
*/
pub struct ReedSolomonDecoder {
let field: GenericGF;
field: GenericGF
}
impl ReedSolomonDecoder {
pub fn new( field: &GenericGF) -> ReedSolomonDecoder {
let .field = field;
pub fn new( field: &GenericGF) -> Self {
Self{ field }
}
/**
@@ -523,7 +526,7 @@ impl ReedSolomonDecoder {
* @param twoS number of error-correction codewords available
* @throws ReedSolomonException if decoding fails for any reason
*/
pub fn decode(&self, received: &Vec<i32>, two_s: i32) -> /* throws ReedSolomonException */Result<Void, Rc<Exception>> {
pub fn decode(&self, received: &Vec<i32>, two_s: i32) -> Result<_, ReedSolomonException> {
let poly: GenericGFPoly = GenericGFPoly::new(self.field, &received);
let syndrome_coefficients: [i32; two_s] = [0; two_s];
let no_error: bool = true;
@@ -556,7 +559,7 @@ impl ReedSolomonDecoder {
{
let mut position: i32 = received.len() - 1 - self.field.log(error_locations[i]);
if position < 0 {
throw ReedSolomonException::new("Bad error location");
return Err( ReedSolomonException::new("Bad error location"));
}
received[position] = GenericGF::add_or_subtract(received[position], error_magnitudes[i]);
}
@@ -566,7 +569,7 @@ impl ReedSolomonDecoder {
}
fn run_euclidean_algorithm(&self, a: &GenericGFPoly, b: &GenericGFPoly, R: i32) -> /* throws ReedSolomonException */Result<Vec<GenericGFPoly>, Rc<Exception>> {
fn run_euclidean_algorithm(&self, a: &GenericGFPoly, b: &GenericGFPoly, R: i32) -> Result<Vec<GenericGFPoly>, ReedSolomonException+IllegalStateException> {
// Assume a's degree is >= b's
if a.get_degree() < b.get_degree() {
let temp: GenericGFPoly = a;
@@ -586,7 +589,7 @@ impl ReedSolomonDecoder {
// Divide rLastLast by rLast, with quotient in q and remainder in r
if r_last.is_zero() {
// Oops, Euclidean algorithm already terminated?
throw ReedSolomonException::new("r_{i-1} was zero");
return Err( ReedSolomonException::new("r_{i-1} was zero"));
}
r = r_last_last;
let mut q: GenericGFPoly = self.field.get_zero();
@@ -600,27 +603,25 @@ impl ReedSolomonDecoder {
}
t = q.multiply(t_last).add_or_subtract(t_last_last);
if r.get_degree() >= r_last.get_degree() {
throw IllegalStateException::new(format!("Division algorithm failed to reduce polynomial? r: {}, rLast: {}", r, r_last));
return Err( IllegalStateException::new(format!("Division algorithm failed to reduce polynomial? r: {}, rLast: {}", r, r_last)));
}
}
let sigma_tilde_at_zero: i32 = t.get_coefficient(0);
if sigma_tilde_at_zero == 0 {
throw ReedSolomonException::new("sigmaTilde(0) was zero");
return Err( ReedSolomonException::new("sigmaTilde(0) was zero"));
}
let inverse: i32 = self.field.inverse(sigma_tilde_at_zero);
let sigma: GenericGFPoly = t.multiply(inverse);
let omega: GenericGFPoly = r.multiply(inverse);
return Ok( : vec![GenericGFPoly; 2] = vec![sigma, omega, ]
);
return Ok( vec![sigma, omega, ]);
}
fn find_error_locations(&self, error_locator: &GenericGFPoly) -> /* throws ReedSolomonException */Result<Vec<i32>, Rc<Exception>> {
fn find_error_locations(&self, error_locator: &GenericGFPoly) -> Result<Vec<i32>, ReedSolomonException> {
// This is a direct application of Chien's search
let num_errors: i32 = error_locator.get_degree();
if num_errors == 1 {
// shortcut
return Ok( : vec![i32; 1] = vec![error_locator.get_coefficient(1), ]
);
return Ok( vec![error_locator.get_coefficient(1), ]);
}
let mut result: [i32; num_errors] = [0; num_errors];
let mut e: i32 = 0;
@@ -638,7 +639,7 @@ impl ReedSolomonDecoder {
}
if e != num_errors {
throw ReedSolomonException::new("Error locator degree does not match number of roots");
return Err( ReedSolomonException::new("Error locator degree does not match number of roots"));
}
return Ok(result);
}
@@ -663,7 +664,7 @@ impl ReedSolomonDecoder {
// Above should work but fails on some Apple and Linux JDKs due to a Hotspot bug.
// Below is a funny-looking workaround from Steven Parkes
let term: i32 = self.field.multiply(error_locations[j], xi_inverse);
let term_plus1: i32 = if (term & 0x1) == 0 { term | 1 } else { term & ~1 };
let term_plus1: i32 = if (term & 0x1) == 0 { term | 1 } else { term & 1 };
denominator = self.field.multiply(denominator, term_plus1);
}
}
@@ -693,18 +694,19 @@ impl ReedSolomonDecoder {
*/
pub struct ReedSolomonEncoder {
let field: GenericGF;
field: GenericGF,
let cached_generators: List<GenericGFPoly>;
cached_generators: Vector<GenericGFPoly>
}
impl ReedSolomonEncoder {
pub fn new( field: &GenericGF) -> ReedSolomonEncoder {
let .field = field;
let .cachedGenerators = ArrayList<>::new();
cached_generators.add(GenericGFPoly::new(field, : vec![i32; 1] = vec![1, ]
));
pub fn new( field: &GenericGF) -> Self {
let mut new_rse;
new_rse .field = field;
new_rse .cachedGenerators = Vector::new();
cached_generators.add(GenericGFPoly::new(field, vec![1, ]));
new_rse
}
fn build_generator(&self, degree: i32) -> GenericGFPoly {
@@ -714,8 +716,7 @@ impl ReedSolomonEncoder {
let mut d: i32 = self.cached_generators.size();
while d <= degree {
{
let next_generator: GenericGFPoly = last_generator.multiply(GenericGFPoly::new(self.field, : vec![i32; 2] = vec![1, self.field.exp(d - 1 + self.field.get_generator_base()), ]
));
let next_generator: GenericGFPoly = last_generator.multiply(GenericGFPoly::new(self.field, vec![1, self.field.exp(d - 1 + self.field.get_generator_base()), ]));
self.cached_generators.add(next_generator);
last_generator = next_generator;
}
@@ -727,13 +728,13 @@ impl ReedSolomonEncoder {
return self.cached_generators.get(degree);
}
pub fn encode(&self, to_encode: &Vec<i32>, ec_bytes: i32) {
pub fn encode(&self, to_encode: &Vec<i32>, ec_bytes: i32) -> Result<_,IllegalArgumentException> {
if ec_bytes == 0 {
throw IllegalArgumentException::new("No error correction bytes");
return Err( IllegalArgumentException::new("No error correction bytes"));
}
let data_bytes: i32 = to_encode.len() - ec_bytes;
if data_bytes <= 0 {
throw IllegalArgumentException::new("No data bytes provided");
return Err( IllegalArgumentException::new("No data bytes provided"));
}
let generator: GenericGFPoly = self.build_generator(ec_bytes);
let info_coefficients: [i32; data_bytes] = [0; data_bytes];
@@ -765,12 +766,12 @@ impl ReedSolomonEncoder {
* @author Sean Owen
*/
pub struct ReedSolomonException {
super: Exception;
message: String
}
impl ReedSolomonException {
pub fn new( message: &String) -> ReedSolomonException {
super(&message);
pub fn new( message: &String) -> Self {
ReedSolomonException{message}
}
}