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https://github.com/zint/zint
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Improved 'look ahead test' from Annex P
This commit is contained in:
Robin Stuart
parent
cbe5b32785
commit
a57001d2ad
@ -228,7 +228,7 @@ static void ecc200(unsigned char *binary, int bytes, int datablock, int rsblock,
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rs_free();
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}
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int isx12(unsigned char source)
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int isX12(unsigned char source)
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{
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if(source == 13) { return 1; }
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if(source == 42) { return 1; }
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@ -261,13 +261,51 @@ void insert_value(unsigned char binary_stream[], int posn, int streamlen, char n
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binary_stream[posn] = newbit;
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}
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int look_ahead_test(unsigned char source[], int sourcelen, int position, int current_mode, int gs1)
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int p_r_6_2_1(unsigned char inputData[], int position, int sourcelen) {
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/* Annex P section (r)(6)(ii)(I)
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"If one of the three X12 terminator/separator characters first
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occurs in the yet to be processed data before a non-X12 character..."
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*/
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int i;
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int nonX12Position = 0;
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int specialX12Position = 0;
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int retval = 0;
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for (i = position; i < sourcelen; i++) {
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if (nonX12Position == 0) {
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if (isX12(i) == 1) {
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nonX12Position = i;
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}
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}
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if (specialX12Position == 0) {
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if ((inputData[i] == (char) 13) ||
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(inputData[i] == '*') ||
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(inputData[i] == '>')) {
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specialX12Position = i;
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}
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}
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}
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if ((nonX12Position != 0) && (specialX12Position != 0)) {
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if (specialX12Position < nonX12Position) {
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retval = 1;
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}
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}
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return retval;
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}
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int look_ahead_test(unsigned char inputData[], int sourcelen, int position, int current_mode, int gs1)
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{
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/* 'look ahead test' from Annex P */
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float ascii_count, c40_count, text_count, x12_count, edf_count, b256_count, best_count;
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int sp, best_scheme;
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best_scheme = DM_NULL;
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/* step (j) */
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if(current_mode == DM_ASCII) {
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ascii_count = 0.0;
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@ -293,103 +331,188 @@ int look_ahead_test(unsigned char source[], int sourcelen, int position, int cur
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case DM_BASE256: b256_count = 0.0; break;
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}
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for(sp = position; (sp < sourcelen) && (sp <= (position + 8)); sp++) {
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sp = position;
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/* ascii ... step (l) */
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if ((source[sp] >= '0') && (source[sp] <= '9')) {
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ascii_count += 0.5;
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} else {
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if (source[sp] > 127) {
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ascii_count = ceil(ascii_count) + 2.0;
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} else {
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ascii_count = ceil(ascii_count) + 1.0;
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}
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}
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do {
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if(sp == (sourcelen - 1)) {
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/* At the end of data ... step (k) */
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ascii_count = ceil(ascii_count);
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b256_count = ceil(b256_count);
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edf_count = ceil(edf_count);
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text_count = ceil(text_count);
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x12_count = ceil(x12_count);
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c40_count = ceil(c40_count);
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/* c40 ... step (m) */
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if ((source[sp] == ' ') || (((source[sp] >= '0') && (source[sp] <= '9')) || ((source[sp] >= 'A') && (source[sp] <= 'Z')))) {
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c40_count += (2.0 / 3.0);
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} else {
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if (source[sp] > 127) {
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c40_count += (8.0 / 3.0);
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} else {
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c40_count += (4.0 / 3.0);
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}
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}
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best_count = c40_count;
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best_scheme = DM_C40; // (k)(7)
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/* text ... step (n) */
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if ((source[sp] == ' ') || (((source[sp] >= '0') && (source[sp] <= '9')) || ((source[sp] >= 'a') && (source[sp] <= 'z')))) {
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text_count += (2.0 / 3.0);
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} else {
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if (source[sp] > 127) {
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text_count += (8.0 / 3.0);
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} else {
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text_count += (4.0 / 3.0);
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}
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}
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if (x12_count < best_count) {
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best_count = x12_count;
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best_scheme = DM_X12; // (k)(6)
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}
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/* x12 ... step (o) */
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if (isx12(source[sp])) {
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x12_count += (2.0 / 3.0);
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} else {
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if (source[sp] > 127) {
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x12_count += (13.0 / 3.0);
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} else {
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x12_count += (10.0 / 3.0);
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}
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}
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if (text_count < best_count) {
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best_count = text_count;
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best_scheme = DM_TEXT; // (k)(5)
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}
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/* edifact ... step (p) */
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if ((source[sp] >= ' ') && (source[sp] <= '^')) {
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edf_count += (3.0 / 4.0);
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} else {
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if (source[sp] > 127) {
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edf_count += (17.0 / 4.0);
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} else {
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edf_count += (13.0 / 4.0);
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}
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}
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if (gs1 && (source[sp] == '[')) {
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edf_count += 6.0;
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}
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if (edf_count < best_count) {
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best_count = edf_count;
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best_scheme = DM_EDIFACT; // (k)(4)
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}
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/* base 256 ... step (q) */
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if (gs1 && (source[sp] == '[')) {
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b256_count += 4.0;
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} else {
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b256_count += 1.0;
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}
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if (b256_count < best_count) {
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best_count = b256_count;
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best_scheme = DM_BASE256; // (k)(3)
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}
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/* printf("%c lat a%.2f c%.2f t%.2f x%.2f e%.2f b%.2f\n", source[sp], ascii_count, c40_count, text_count, x12_count, edf_count, b256_count); */
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}
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if (ascii_count <= best_count) {
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best_scheme = DM_ASCII; // (k)(2)
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}
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} else {
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best_count = ascii_count;
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best_scheme = DM_ASCII;
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/* ascii ... step (l) */
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if ((inputData[sp] >= '0') && (inputData[sp] <= '9')) {
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ascii_count += 0.5; // (l)(1)
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} else {
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if (inputData[sp] > 127) {
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ascii_count = ceil(ascii_count) + 2.0; // (l)(2)
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} else {
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ascii_count = ceil(ascii_count) + 1.0; // (l)(3)
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}
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}
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if(b256_count <= best_count) {
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best_count = b256_count;
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best_scheme = DM_BASE256;
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}
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/* c40 ... step (m) */
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if ((inputData[sp] == ' ') ||
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(((inputData[sp] >= '0') && (inputData[sp] <= '9')) ||
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((inputData[sp] >= 'A') && (inputData[sp] <= 'Z')))) {
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c40_count += (2.0 / 3.0); // (m)(1)
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} else {
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if (inputData[sp] > 127) {
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c40_count += (8.0 / 3.0); // (m)(2)
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} else {
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c40_count += (4.0 / 3.0); // (m)(3)
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}
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}
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if(edf_count <= best_count) {
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best_count = edf_count;
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best_scheme = DM_EDIFACT;
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}
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/* text ... step (n) */
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if ((inputData[sp] == ' ') ||
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(((inputData[sp] >= '0') && (inputData[sp] <= '9')) ||
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((inputData[sp] >= 'a') && (inputData[sp] <= 'z')))) {
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text_count += (2.0 / 3.0); // (n)(1)
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} else {
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if (inputData[sp] > 127) {
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text_count += (8.0 / 3.0); // (n)(2)
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} else {
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text_count += (4.0 / 3.0); // (n)(3)
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}
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}
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if(text_count <= best_count) {
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best_count = text_count;
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best_scheme = DM_TEXT;
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}
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/* x12 ... step (o) */
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if (isX12(inputData[sp])) {
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x12_count += (2.0 / 3.0); // (o)(1)
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} else {
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if (inputData[sp] > 127) {
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x12_count += (13.0 / 3.0); // (o)(2)
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} else {
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x12_count += (10.0 / 3.0); // (o)(3)
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}
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}
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if(x12_count <= best_count) {
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best_count = x12_count;
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best_scheme = DM_X12;
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}
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/* edifact ... step (p) */
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if ((inputData[sp] >= ' ') && (inputData[sp] <= '^')) {
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edf_count += (3.0 / 4.0); // (p)(1)
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} else {
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if (inputData[sp] > 127) {
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edf_count += (17.0 / 4.0); // (p)(2)
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} else {
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edf_count += (13.0 / 4.0); // (p)(3)
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}
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}
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if ((gs1 == 1) && (inputData[sp] == '[')) {
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edf_count += 6.0;
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}
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if(c40_count <= best_count) {
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best_count = c40_count;
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best_scheme = DM_C40;
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}
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/* base 256 ... step (q) */
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if ((gs1 == 1) && (inputData[sp] == '[')) {
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b256_count += 4.0; // (q)(1)
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} else {
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b256_count += 1.0; // (q)(2)
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}
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}
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if (sp > (position + 3)) {
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/* 4 data characters processed ... step (r) */
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/* step (r)(6) */
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if (((c40_count + 1.0) < ascii_count) &&
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((c40_count + 1.0) < b256_count) &&
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((c40_count + 1.0) < edf_count) &&
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((c40_count + 1.0) < text_count)) {
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if (c40_count < x12_count) {
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best_scheme = DM_C40;
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}
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if (c40_count == x12_count) {
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if (p_r_6_2_1(inputData, sp, sourcelen) == 1) {
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// Test (r)(6)(ii)(i)
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best_scheme = DM_X12;
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} else {
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best_scheme = DM_C40;
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}
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}
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}
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/* step (r)(5) */
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if (((x12_count + 1.0) < ascii_count) &&
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((x12_count + 1.0) < b256_count) &&
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((x12_count + 1.0) < edf_count) &&
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((x12_count + 1.0) < text_count) &&
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((x12_count + 1.0) < c40_count)) {
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best_scheme = DM_X12;
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}
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/* step (r)(4) */
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if (((text_count + 1.0) < ascii_count) &&
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((text_count + 1.0) < b256_count) &&
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((text_count + 1.0) < edf_count) &&
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((text_count + 1.0) < x12_count) &&
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((text_count + 1.0) < c40_count)) {
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best_scheme = DM_TEXT;
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}
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/* step (r)(3) */
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if (((edf_count + 1.0) < ascii_count) &&
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((edf_count + 1.0) < b256_count) &&
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((edf_count + 1.0) < text_count) &&
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((edf_count + 1.0) < x12_count) &&
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((edf_count + 1.0) < c40_count)) {
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best_scheme = DM_EDIFACT;
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}
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/* step (r)(2) */
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if (((b256_count + 1.0) <= ascii_count) ||
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(((b256_count + 1.0) < edf_count) &&
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((b256_count + 1.0) < text_count) &&
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((b256_count + 1.0) < x12_count) &&
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((b256_count + 1.0) < c40_count))) {
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best_scheme = DM_BASE256;
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}
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/* step (r)(1) */
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if (((ascii_count + 1.0) <= b256_count) &&
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((ascii_count + 1.0) <= edf_count) &&
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((ascii_count + 1.0) <= text_count) &&
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((ascii_count + 1.0) <= x12_count) &&
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((ascii_count + 1.0) <= c40_count)) {
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best_scheme = DM_ASCII;
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}
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}
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sp++;
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} while (best_scheme == DM_NULL); // step (s)
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return best_scheme;
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}
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@ -53,6 +53,7 @@ extern int data_matrix_200(struct zint_symbol *symbol, unsigned char source[], i
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#define MAXBARCODE 3116
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#define DM_NULL 0
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#define DM_ASCII 1
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#define DM_C40 2
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#define DM_TEXT 3
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