package com.google.zxing.qrcode.encoder;
-import java.util.Vector;
+import com.google.zxing.common.reedsolomon.ReedSolomonEncoder;
+import com.google.zxing.common.reedsolomon.GF256;
-// class GF_Poly;
-// #include "util/reedsolomon/galois_field.h"
-// #include "util/reedsolomon/galois_poly.h"
+import java.util.Vector;
/**
* @author satorux@google.com (Satoru Takabayashi) - creator
27, 101, 184, 127, 3, 5, 8, 163, 238 }),
};
- private static final int kFieldSize = 8;
- private static GF_Poly[] g_ec_polynomials = new GF_Poly[kMaxNumECBytes + 1];
-
private static final class BlockPair {
private ByteArray dataBytes;
// the result in "num_data_bytes_in_block", and "num_ec_bytes_in_block". See table 12 in 8.5.1 of
// JISX0510:2004 (p.30)
static void GetNumDataBytesAndNumECBytesForBlockID(int num_total_bytes, int num_data_bytes,
- int num_rs_blocks, int block_id, Integer num_data_bytes_in_block,
- Integer num_ec_bytes_in_block) {
+ int num_rs_blocks, int block_id, int[] num_data_bytes_in_block,
+ int[] num_ec_bytes_in_block) {
Debug.DCHECK_LT(block_id, num_rs_blocks);
// num_rs_blocks_in_group2 = 196 % 5 = 1
final int num_rs_blocks_in_group2 = num_total_bytes % num_rs_blocks;
num_rs_blocks_in_group2));
if (block_id < num_rs_blocks_in_group1) {
- num_data_bytes_in_block = num_data_bytes_in_group1;
- num_ec_bytes_in_block = num_ec_bytes_in_group1;
+ num_data_bytes_in_block[0] = num_data_bytes_in_group1;
+ num_ec_bytes_in_block[0] = num_ec_bytes_in_group1;
} else {
- num_data_bytes_in_block = num_data_bytes_in_group2;
- num_ec_bytes_in_block = num_ec_bytes_in_group2;
+ num_data_bytes_in_block[0] = num_data_bytes_in_group2;
+ num_ec_bytes_in_block[0] = num_ec_bytes_in_group2;
}
}
int max_num_ec_bytes = 0;
// Since, we know the number of reedsolmon blocks, we can initialize the vector with the number.
- Vector<BlockPair> blocks = new Vector<BlockPair>(num_rs_blocks);
+ Vector blocks = new Vector(num_rs_blocks);
for (int i = 0; i < num_rs_blocks; ++i) {
- Integer num_data_bytes_in_block = new Integer(0);
- Integer num_ec_bytes_in_block = new Integer(0);
+ int[] num_data_bytes_in_block = new int[1];
+ int[] num_ec_bytes_in_block = new int[1];
GetNumDataBytesAndNumECBytesForBlockID(
num_total_bytes, num_data_bytes, num_rs_blocks, i,
num_data_bytes_in_block, num_ec_bytes_in_block);
ByteArray ec_bytes = new ByteArray();
blocks.addElement(new BlockPair(data_bytes, ec_bytes));
- data_bytes.set(bits, data_bytes_offset, num_data_bytes_in_block);
- GenerateECBytes(data_bytes, num_ec_bytes_in_block, ec_bytes);
+ data_bytes.set(bits, data_bytes_offset, num_data_bytes_in_block[0]);
+ GenerateECBytes(data_bytes, num_ec_bytes_in_block[0], ec_bytes);
max_num_data_bytes = Math.max(max_num_data_bytes, data_bytes.size());
max_num_ec_bytes = Math.max(max_num_ec_bytes, ec_bytes.size());
- data_bytes_offset += num_data_bytes_in_block;
+ data_bytes_offset += num_data_bytes_in_block[0];
}
Debug.DCHECK_EQ(num_data_bytes, data_bytes_offset);
// First, place data blocks.
for (int i = 0; i < max_num_data_bytes; ++i) {
for (int j = 0; j < blocks.size(); ++j) {
- final ByteArray data_bytes = blocks.elementAt(j).getDataBytes();
+ final ByteArray data_bytes = ((BlockPair) blocks.elementAt(j)).getDataBytes();
if (i < data_bytes.size()) {
result.AppendBits(data_bytes.at(i), 8);
}
// Then, place error correction blocks.
for (int i = 0; i < max_num_ec_bytes; ++i) {
for (int j = 0; j < blocks.size(); ++j) {
- final ByteArray ec_bytes = blocks.elementAt(j).getErrorCorrectionBytes();
+ final ByteArray ec_bytes = ((BlockPair) blocks.elementAt(j)).getErrorCorrectionBytes();
if (i < ec_bytes.size()) {
result.AppendBits(ec_bytes.at(i), 8);
}
return false;
}
+ private static void GenerateECBytes(ByteArray data_bytes, int num_ec_bytes_in_block, ByteArray ec_bytes) {
+ int numDataBytes = data_bytes.size();
+ int[] toEncode = new int[numDataBytes + ec_bytes.size()];
+ for (int i = 0; i < numDataBytes; i++) {
+ toEncode[i] = data_bytes.at(i);
+ }
+ new ReedSolomonEncoder(GF256.QR_CODE_FIELD).encode(toEncode, num_ec_bytes_in_block);
+ for (int i = 0; i < ec_bytes.size(); i++) {
+ ec_bytes.set(i, toEncode[numDataBytes + i]);
+ }
+ }
+
// Append mode info. On success, store the result in "bits" and return true. On error, return
// false.
static boolean AppendModeInfo(int mode, BitVector bits) {
return true;
}
- // Only call once
- static {
- InitECPolynomials();
- }
-
- // Initialize "g_ec_polynomials" with numbers in kECPolynomials.
- private static void InitECPolynomials() {
- final GaloisField field = GaloisField.GetField(kFieldSize);
- for (int i = 0; i < kECPolynomials.length; ++i) {
- final ECPolyInfo ec_poly_info = kECPolynomials[i];
- final int ec_length = ec_poly_info.ec_length;
- vector<GF_Element> *coeffs = new vector<GF_Element>;
- // The number of coefficients is one more than "ec_length". That's why the termination
- // condition is <= instead of <.
- for (int j = 0; j <= ec_length; ++j) {
- // We need exp'ed numbers for later use.
- final int coeff = field.Exp(ec_poly_info.coeffs[j]);
- coeffs.push_back(coeff);
- }
- // Reverse the coefficients since the numbers in kECPolynomials are ordered in reverse order
- // to the order GF_Poly expects.
- reverse(coeffs.begin(), coeffs.end());
-
- GF_Poly ec_poly = new GF_Poly(coeffs, GaloisField.GetField(kFieldSize));
- g_ec_polynomials[ec_length] = ec_poly;
- }
- }
-
- // Get error correction polynomials. The polynomials are defined in Appendix A of JISX0510 2004
- // (p. 59). In the appendix, they use exponential notations for the polynomials. We need to apply
- // GaloisField.Log() to all coefficients generated by the function to compare numbers with the
- // ones in the appendix.
- //
- // Example:
- // - Input: 17
- // - Output (in reverse order)
- // {119,66,83,120,119,22,197,83,249,41,143,134,85,53,125,99,79}
- // - Log()'ed output (in reverse order)
- // {0,43,139,206,78,43,239,123,206,214,147,24,99,150,39,243,163,136}
- private static final GF_Poly GetECPoly(int ec_length) {
- Debug.DCHECK_GE(kMaxNumECBytes, ec_length);
- final GF_Poly ec_poly = g_ec_polynomials[ec_length];
- Debug.DCHECK(ec_poly);
- return ec_poly;
- }
-
- // Generate error correction bytes of "ec_length".
- //
- // Example:
- // - Input: {32,65,205,69,41,220,46,128,236}, ec_length = 17
- // - Output: {42,159,74,221,244,169,239,150,138,70,237,85,224,96,74,219,61}
- private static void GenerateECBytes(final ByteArray data_bytes, int ec_length, ByteArray ec_bytes) {
- // First, fill the vector with "ec_length" copies of 0. They are low-order zero coefficients.
- vector<GF_Element> *coeffs = new vector<GF_Element>(ec_length, 0);
- // Then copy data_bytes backward.
- copy(data_bytes.rbegin(), data_bytes.rend(), back_inserter(*coeffs));
- // Now we have data polynomial.
- GF_Poly data_poly(coeffs, GaloisField.GetField(kFieldSize));
-
- // Get error correction polynomial.
- final GF_Poly &ec_poly = GetECPoly(ec_length);
- pair<GF_Poly*, GF_Poly*> divrem = GF_Poly.DivRem(data_poly, ec_poly);
-
- // Basically, the coefficients in the remainder polynomial are the error correction bytes.
- GF_Poly *remainder = divrem.second;
- ec_bytes.reserve(ec_length);
- // However, high-order zero cofficients in the remainder polynomial are ommited. We should add
- // zero by ourselvs.
- final int num_pruned_zero_coeffs = ec_length - (remainder.degree() + 1);
- for (int i = 0; i < num_pruned_zero_coeffs; ++i) {
- ec_bytes.appendByte(0);
- }
- // Copy the remainder numbers to "ec_bytes".
- for (int i = remainder.degree(); i >= 0; --i) {
- ec_bytes.appendByte(remainder.coeff(i));
- }
- Debug.DCHECK_EQ(ec_length, ec_bytes.size());
- }
-
// Check if "byte1" and "byte2" can compose a valid Kanji letter (2-byte Shift_JIS letter). The
// numbers are from http://ja.wikipedia.org/wiki/Shift_JIS.
private static boolean IsValidKanji(final int byte1, final int byte2) {
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