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QR-Code-generator
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Added new private constant to C code.

This commit is contained in:
Project Nayuki 2018-08-28 04:41:21 +00:00
parent e7d2449957
commit 45c4ac7f2e
1 changed files with 7 additions and 3 deletions
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10
c/qrcodegen.c
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@ -105,6 +105,8 @@ testable const int8_t ECC_CODEWORDS_PER_BLOCK[4][41] = {
{-1, 17, 28, 22, 16, 22, 28, 26, 26, 24, 28, 24, 28, 22, 24, 24, 30, 28, 28, 26, 28, 30, 24, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30}, // High {-1, 17, 28, 22, 16, 22, 28, 26, 26, 24, 28, 24, 28, 22, 24, 24, 30, 28, 28, 26, 28, 30, 24, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30}, // High
}; };
#define qrcodegen_REED_SOLOMON_DEGREE_MAX 30 // Based on the table above
// For generating error correction codes. // For generating error correction codes.
testable const int8_t NUM_ERROR_CORRECTION_BLOCKS[4][41] = { testable const int8_t NUM_ERROR_CORRECTION_BLOCKS[4][41] = {
// Version: (note that index 0 is for padding, and is set to an illegal value) // Version: (note that index 0 is for padding, and is set to an illegal value)
@ -206,7 +208,7 @@ testable void addEccAndInterleave(uint8_t data[], int version, enum qrcodegen_Ec
int shortBlockDataLen = rawCodewords / numBlocks - blockEccLen; int shortBlockDataLen = rawCodewords / numBlocks - blockEccLen;
// Split data into blocks and append ECC after all data // Split data into blocks and append ECC after all data
uint8_t generator[30]; uint8_t generator[qrcodegen_REED_SOLOMON_DEGREE_MAX];
calcReedSolomonGenerator(blockEccLen, generator); calcReedSolomonGenerator(blockEccLen, generator);
for (int i = 0, j = dataLen, k = 0; i < numBlocks; i++) { for (int i = 0, j = dataLen, k = 0; i < numBlocks; i++) {
int blockLen = shortBlockDataLen; int blockLen = shortBlockDataLen;
@ -265,7 +267,7 @@ testable int getNumRawDataModules(int version) {
// Calculates the Reed-Solomon generator polynomial of the given degree, storing in result[0 : degree]. // Calculates the Reed-Solomon generator polynomial of the given degree, storing in result[0 : degree].
testable void calcReedSolomonGenerator(int degree, uint8_t result[]) { testable void calcReedSolomonGenerator(int degree, uint8_t result[]) {
// Start with the monomial x^0 // Start with the monomial x^0
assert(1 <= degree && degree <= 30); assert(1 <= degree && degree <= qrcodegen_REED_SOLOMON_DEGREE_MAX);
memset(result, 0, degree * sizeof(result[0])); memset(result, 0, degree * sizeof(result[0]));
result[degree - 1] = 1; result[degree - 1] = 1;
@ -291,7 +293,7 @@ testable void calcReedSolomonRemainder(const uint8_t data[], int dataLen,
const uint8_t generator[], int degree, uint8_t result[]) { const uint8_t generator[], int degree, uint8_t result[]) {
// Perform polynomial division // Perform polynomial division
assert(1 <= degree && degree <= 30); assert(1 <= degree && degree <= qrcodegen_REED_SOLOMON_DEGREE_MAX);
memset(result, 0, degree * sizeof(result[0])); memset(result, 0, degree * sizeof(result[0]));
for (int i = 0; i < dataLen; i++) { for (int i = 0; i < dataLen; i++) {
uint8_t factor = data[i] ^ result[0]; uint8_t factor = data[i] ^ result[0];
@ -302,6 +304,8 @@ testable void calcReedSolomonRemainder(const uint8_t data[], int dataLen,
} }
} }
#undef qrcodegen_REED_SOLOMON_DEGREE_MAX
// Returns the product of the two given field elements modulo GF(2^8/0x11D). // Returns the product of the two given field elements modulo GF(2^8/0x11D).
// All inputs are valid. This could be implemented as a 256*256 lookup table. // All inputs are valid. This could be implemented as a 256*256 lookup table.