/* upcean.c - Handles UPC, EAN and ISBN libzint - the open source barcode library Copyright (C) 2008 Robin Stuart This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #define NASET "0123456789+" #define EAN2 102 #define EAN5 105 #include #include #include #include "common.h" /* UPC and EAN tables checked against EN 797:1996 */ static char *UPCParity0[10] = {"BBBAAA", "BBABAA", "BBAABA", "BBAAAB", "BABBAA", "BAABBA", "BAAABB", "BABABA", "BABAAB", "BAABAB"}; /* Number set for UPC-E symbol (EN Table 4) */ static char *UPCParity1[10] = {"AAABBB", "AABABB", "AABBAB", "AABBBA", "ABAABB", "ABBAAB", "ABBBAA", "ABABAB", "ABABBA", "ABBABA"}; /* Not covered by BS EN 797:1995 */ static char *EAN2Parity[4] = {"AA", "AB", "BA", "BB"}; /* Number sets for 2-digit add-on (EN Table 6) */ static char *EAN5Parity[10] = {"BBAAA", "BABAA", "BAABA", "BAAAB", "ABBAA", "AABBA", "AAABB", "ABABA", "ABAAB", "AABAB"}; /* Number set for 5-digit add-on (EN Table 7) */ static char *EAN13Parity[10] = {"AAAAA", "ABABB", "ABBAB", "ABBBA", "BAABB", "BBAAB", "BBBAA", "BABAB", "BABBA", "BBABA"}; /* Left hand of the EAN-13 symbol (EN Table 3) */ static char *EANsetA[10] = {"3211", "2221", "2122", "1411", "1132", "1231", "1114", "1312", "1213", "3112"}; /* Representation set A and C (EN Table 1) */ static char *EANsetB[10] = {"1123", "1222", "2212", "1141", "2311", "1321", "4111", "2131", "3121", "2113"}; /* Representation set B (EN Table 1) */ char upc_check(unsigned char source[]) { /* Calculate the correct check digit for a UPC barcode */ unsigned int i, count, check_digit; count = 0; for (i = 0; i < ustrlen(source); i++) { count += ctoi(source[i]); if ((i%2) == 0) { count += 2 * (ctoi(source[i])); } } check_digit = 10 - (count%10); if (check_digit == 10) { check_digit = 0; } return itoc(check_digit); } void upca_draw(unsigned char source[], char dest[]) { /* UPC A is usually used for 12 digit numbers, but this function takes a source of any length */ unsigned int i, half_way; half_way = ustrlen(source) / 2; /* start character */ concat (dest, "111"); for(i = 0; i <= ustrlen(source); i++) { if (i == half_way) { /* middle character - separates manufacturer no. from product no. */ /* also inverts right hand characters */ concat(dest, "11111"); } lookup(NESET, EANsetA, source[i], dest); } /* stop character */ concat (dest, "111"); } void upca(struct zint_symbol *symbol, unsigned char source[], char dest[]) { /* Make a UPC A barcode when we haven't been given the check digit */ int length; length = ustrlen(source); source[length] = upc_check(source); source[length + 1] = '\0'; upca_draw(source, dest); strcpy(symbol->text, (char*)source); } void upce(struct zint_symbol *symbol, unsigned char source[], char dest[]) { /* UPC E is a zero-compressed version of UPC A */ unsigned int i, num_system; char emode, equivalent[12], check_digit, parity[8], temp[8]; char hrt[9]; /* Two number systems can be used - system 0 and system 1 */ if(ustrlen(source) == 7) { switch(source[0]) { case '0': num_system = 0; break; case '1': num_system = 1; break; default: num_system = 0; source[0] = '0'; break; } strcpy(temp, (char*)source); strcpy(hrt, (char*)source); for(i = 1; i <= 7; i++) { source[i - 1] = temp[i]; } } else { num_system = 0; hrt[0] = '0'; hrt[1] = '\0'; concat(hrt, (char*)source); } /* Expand the zero-compressed UPCE code to make a UPCA equivalent (EN Table 5) */ emode = source[5]; for(i = 0; i < 11; i++) { equivalent[i] = '0'; } equivalent[1] = source[0]; equivalent[2] = source[1]; equivalent[11] = '\0'; switch(emode) { case '0': case '1': case '2': equivalent[3] = emode; equivalent[8] = source[2]; equivalent[9] = source[3]; equivalent[10] = source[4]; break; case '3': equivalent[3] = source[2]; equivalent[9] = source[3]; equivalent[10] = source[4]; if(((source[2] == '0') || (source[2] == '1')) || (source[2] == '2')) { /* Note 1 - "X3 shall not be equal to 0, 1 or 2" */ strcpy(symbol->errtxt, "warning: invalid UPC-E data"); } break; case '4': equivalent[3] = source[2]; equivalent[4] = source[3]; equivalent[10] = source[4]; if(source[3] == '0') { /* Note 2 - "X4 shall not be equal to 0" */ strcpy(symbol->errtxt, "warning: invalid UPC-E data"); } break; case '5': case '6': case '7': case '8': case '9': equivalent[3] = source[2]; equivalent[4] = source[3]; equivalent[5] = source[4]; equivalent[10] = emode; if(source[4] == '0') { /* Note 3 - "X5 shall not be equal to 0" */ strcpy(symbol->errtxt, "warning: invalid UPC-E data"); } break; } /* Get the check digit from the expanded UPCA code */ check_digit = upc_check((unsigned char*)equivalent); /* Use the number system and check digit information to choose a parity scheme */ if(num_system == 1) { strcpy(parity, UPCParity1[ctoi(check_digit)]); } else { strcpy(parity, UPCParity0[ctoi(check_digit)]); } /* Take all this information and make the barcode pattern */ /* start character */ concat (dest, "111"); for(i = 0; i <= ustrlen(source); i++) { switch(parity[i]) { case 'A': lookup(NESET, EANsetA, source[i], dest); break; case 'B': lookup(NESET, EANsetB, source[i], dest); break; } } /* stop character */ concat (dest, "111111"); hrt[7] = check_digit; hrt[8] = '\0'; strcpy(symbol->text, hrt); } void add_on(unsigned char source[], char dest[], int mode) { /* EAN-2 and EAN-5 add-on codes */ char parity[6]; unsigned int i, code_type; /* If an add-on then append with space */ if (mode != 0) { concat(dest, "9"); } /* Start character */ concat (dest, "112"); /* Determine EAN2 or EAN5 add-on */ if(ustrlen(source) == 2) { code_type = EAN2; } else { code_type = EAN5; } /* Calculate parity for EAN2 */ if(code_type == EAN2) { int code_value, parity_bit; code_value = (10 * ctoi(source[0])) + ctoi(source[1]); parity_bit = code_value%4; strcpy(parity, EAN2Parity[parity_bit]); } if(code_type == EAN5) { int values[6], parity_sum, parity_bit; for(i = 0; i < 6; i++) { values[i] = ctoi(source[i]); } parity_sum = (3 * (values[0] + values[2] + values[4])); parity_sum += (9 * (values[1] + values[3])); parity_bit = parity_sum%10; strcpy(parity, EAN5Parity[parity_bit]); } for(i = 0; i < ustrlen(source); i++) { switch(parity[i]) { case 'A': lookup(NESET, EANsetA, source[i], dest); break; case 'B': lookup(NESET, EANsetB, source[i], dest); break; } /* Glyph separator */ if(i != (ustrlen(source) - 1)) { concat (dest, "11"); } } } /* ************************ EAN-13 ****************** */ char ean_check(unsigned char source[]) { /* Calculate the correct check digit for a EAN-13 barcode */ int i; unsigned int h, count, check_digit; count = 0; h = ustrlen(source); for (i = h - 1; i >= 0; i--) { count += ctoi(source[i]); if (!((i%2) == 0)) { count += 2 * ctoi(source[i]); } } check_digit = 10 - (count%10); if (check_digit == 10) { check_digit = 0; } return itoc(check_digit); } void ean13(struct zint_symbol *symbol, unsigned char source[], char dest[]) { unsigned int length, i, half_way; char parity[6]; strcpy(parity, ""); /* Add the appropriate check digit */ length = ustrlen(source); source[length] = ean_check(source); source[length + 1] = '\0'; /* Get parity for first half of the symbol */ lookup(NASET, EAN13Parity, source[0], parity); /* Now get on with the cipher */ half_way = 7; /* start character */ concat (dest, "111"); for(i = 1; i <= ustrlen(source); i++) { if (i == half_way) { /* middle character - separates manufacturer no. from product no. */ /* also inverses right hand characters */ concat (dest, "11111"); } if(((i > 1) && (i < 7)) && (parity[i - 2] == 'B')) { lookup(NESET, EANsetB, source[i], dest); } else { lookup(NESET, EANsetA, source[i], dest); } } /* stop character */ concat (dest, "111"); strcpy(symbol->text, (char*)source); } void ean8(struct zint_symbol *symbol, unsigned char source[], char dest[]) { /* Make an EAN-8 barcode when we haven't been given the check digit */ /* EAN-8 is basically the same as UPC-A but with fewer digits */ int length; length = ustrlen(source); source[length] = upc_check(source); source[length + 1] = '\0'; upca_draw(source, dest); strcpy(symbol->text, (char*)source); } char isbn13_check(unsigned char source[]) /* For ISBN(13) only */ { unsigned int i, weight, sum, check; sum = 0; weight = 1; for(i = 0; i < (ustrlen(source) - 1); i++) { sum += ctoi(source[i]) * weight; if(weight == 1) weight = 3; else weight = 1; } check = sum % 10; check = 10 - check; return itoc(check); } char isbn_check(unsigned char source[]) /* For ISBN(10) and SBN only */ { unsigned int i, weight, sum, check; sum = 0; weight = 1; for(i = 0; i < (ustrlen(source) - 1); i++) { sum += ctoi(source[i]) * weight; weight++; } check = sum % 11; return itoc(check); } int isbn(struct zint_symbol *symbol, unsigned char source[], char dest[]) /* Make an EAN-13 barcode from an SBN or ISBN */ { int i, errno; char check_digit; errno = 0; to_upper(source); errno = is_sane("0123456789X", source); if(errno == ERROR_INVALID_DATA) { strcpy(symbol->errtxt, "error: invalid characters in input"); return errno; } /* Input must be 9, 10 or 13 characters */ if(((ustrlen(source) < 9) || (ustrlen(source) > 13)) || ((ustrlen(source) > 10) && (ustrlen(source) < 13))) { strcpy(symbol->errtxt, "error: input wrong length"); return ERROR_TOO_LONG; } if(ustrlen(source) == 13) /* Using 13 character ISBN */ { if(!(((source[0] == '9') && (source[1] == '7')) && ((source[2] == '8') || (source[2] == '9')))) { strcpy(symbol->errtxt, "error: invalid ISBN"); return ERROR_INVALID_DATA; } check_digit = isbn13_check(source); if (source[ustrlen(source) - 1] != check_digit) { strcpy(symbol->errtxt, "error: incorrect ISBN check"); return ERROR_INVALID_CHECK; } source[12] = '\0'; ean13(symbol, source, dest); } if(ustrlen(source) == 10) /* Using 10 digit ISBN */ { check_digit = isbn_check(source); if(check_digit != source[ustrlen(source) - 1]) { strcpy(symbol->errtxt, "error: incorrect ISBN check"); return ERROR_INVALID_CHECK; } for(i = 13; i > 0; i--) { source[i] = source[i - 3]; } source[0] = '9'; source[1] = '7'; source[2] = '8'; source[12] = '\0'; ean13(symbol, source, dest); } if(ustrlen(source) == 9) /* Using 9 digit SBN */ { /* Add leading zero */ for(i = 10; i > 0; i--) { source[i] = source[i - 1]; } source[0] = '0'; /* Verify check digit */ check_digit = isbn_check(source); if(check_digit != source[ustrlen(source) - 1]) { strcpy(symbol->errtxt, "error: incorrect SBN check"); return ERROR_INVALID_CHECK; } /* Convert to EAN-13 number */ for(i = 13; i > 0; i--) { source[i] = source[i - 3]; } source[0] = '9'; source[1] = '7'; source[2] = '8'; source[12] = '\0'; ean13(symbol, source, dest); } return errno; } int eanx(struct zint_symbol *symbol, unsigned char source[]) { /* splits string to parts before and after '+' parts */ unsigned char first_part[20], second_part[20], dest[1000]; unsigned int latch, reader, writer, with_addon; int errno, i; errno = 0; memset(dest,0,1000); memset(first_part,0,20); memset(second_part,0,20); with_addon = FALSE; latch = FALSE; writer = 0; if(ustrlen(source) > 19) { strcpy(symbol->errtxt, "error: input too long"); return ERROR_TOO_LONG; } if(symbol->symbology != BARCODE_ISBNX) { /* ISBN has it's own checking routine */ errno = is_sane(NASET, source); if(errno == ERROR_INVALID_DATA) { strcpy(symbol->errtxt, "error: invalid characters in data"); return errno; } } for(reader = 0; reader <= ustrlen(source); reader++) { if(source[reader] == '+') { with_addon = TRUE; } } reader = 0; if(with_addon) { do { if(source[reader] == '+') { first_part[writer] = '\0'; latch = TRUE; reader++; writer = 0; } if(latch) { second_part[writer] = source[reader]; reader++; writer++; } else { first_part[writer] = source[reader]; reader++; writer++; } } while (reader <= ustrlen(source)); } else { strcpy((char*)first_part, (char*)source); } switch(symbol->symbology) { case BARCODE_EANX: switch(ustrlen(first_part)) { case 2: add_on(first_part, (char*)dest, 0); strcpy(symbol->text, (char*)first_part); break; case 5: add_on(first_part, (char*)dest, 0); strcpy(symbol->text, (char*)first_part); break; case 7: ean8(symbol, first_part, (char*)dest); break; case 12: ean13(symbol, first_part, (char*)dest); break; default: strcpy(symbol->errtxt, "error: invalid length input"); return ERROR_TOO_LONG; break; } break; case BARCODE_EANX_CC: switch(ustrlen(first_part)) { /* Adds vertical separator bars according to ISO/IEC 24723 section 11.4 */ case 7: symbol->encoded_data[symbol->rows][1] = '1'; symbol->encoded_data[symbol->rows][67] = '1'; symbol->encoded_data[symbol->rows + 1][0] = '1'; symbol->encoded_data[symbol->rows + 1][68] = '1'; symbol->encoded_data[symbol->rows + 2][1] = '1'; symbol->encoded_data[symbol->rows + 2][67] = '1'; symbol->row_height[symbol->rows] = 2; symbol->row_height[symbol->rows + 1] = 2; symbol->row_height[symbol->rows + 2] = 2; symbol->rows += 3; ean8(symbol, first_part, (char*)dest); break; case 12:symbol->encoded_data[symbol->rows][1] = '1'; symbol->encoded_data[symbol->rows][95] = '1'; symbol->encoded_data[symbol->rows + 1][0] = '1'; symbol->encoded_data[symbol->rows + 1][96] = '1'; symbol->encoded_data[symbol->rows + 2][1] = '1'; symbol->encoded_data[symbol->rows + 2][95] = '1'; symbol->row_height[symbol->rows] = 2; symbol->row_height[symbol->rows + 1] = 2; symbol->row_height[symbol->rows + 2] = 2; symbol->rows += 3; ean13(symbol, first_part, (char*)dest); break; default: strcpy(symbol->errtxt, "error: invalid length EAN input"); return ERROR_TOO_LONG; break; } break; case BARCODE_UPCA: if(ustrlen(first_part) == 11) { upca(symbol, first_part, (char*)dest); } else { strcpy(symbol->errtxt, "error: input wrong length"); return ERROR_TOO_LONG; } break; case BARCODE_UPCA_CC: if(ustrlen(first_part) == 11) { symbol->encoded_data[symbol->rows][1] = '1'; symbol->encoded_data[symbol->rows][95] = '1'; symbol->encoded_data[symbol->rows + 1][0] = '1'; symbol->encoded_data[symbol->rows + 1][96] = '1'; symbol->encoded_data[symbol->rows + 2][1] = '1'; symbol->encoded_data[symbol->rows + 2][95] = '1'; symbol->row_height[symbol->rows] = 2; symbol->row_height[symbol->rows + 1] = 2; symbol->row_height[symbol->rows + 2] = 2; symbol->rows += 3; upca(symbol, first_part, (char*)dest); } else { strcpy(symbol->errtxt, "error: UPCA input wrong length"); return ERROR_TOO_LONG; } break; case BARCODE_UPCE: if((ustrlen(first_part) >= 6) && (ustrlen(first_part) <= 7)) { upce(symbol, first_part, (char*)dest); } else { strcpy(symbol->errtxt, "error: input wrong length"); return ERROR_TOO_LONG; } break; case BARCODE_UPCE_CC: if((ustrlen(first_part) >= 6) && (ustrlen(first_part) <= 7)) { symbol->encoded_data[symbol->rows][1] = '1'; symbol->encoded_data[symbol->rows][51] = '1'; symbol->encoded_data[symbol->rows + 1][0] = '1'; symbol->encoded_data[symbol->rows + 1][52] = '1'; symbol->encoded_data[symbol->rows + 2][1] = '1'; symbol->encoded_data[symbol->rows + 2][51] = '1'; symbol->row_height[symbol->rows] = 2; symbol->row_height[symbol->rows + 1] = 2; symbol->row_height[symbol->rows + 2] = 2; symbol->rows += 3; upce(symbol, first_part, (char*)dest); } else { strcpy(symbol->errtxt, "error: UPCE input wrong length"); return ERROR_TOO_LONG; } break; case BARCODE_ISBNX: errno = isbn(symbol, first_part, (char*)dest); if(errno > 4) { return errno; } break; } switch(ustrlen(second_part)) { case 0: break; case 2: add_on(second_part, (char*)dest, 1); concat(symbol->text, "+"); concat(symbol->text, (char*)second_part); break; case 5: add_on(second_part, (char*)dest, 1); concat(symbol->text, "+"); concat(symbol->text, (char*)second_part); break; default: strcpy(symbol->errtxt, "error: invalid length input"); return ERROR_TOO_LONG; break; } expand(symbol, (char*)dest); switch(symbol->symbology) { case BARCODE_EANX_CC: case BARCODE_UPCA_CC: case BARCODE_UPCE_CC: /* shift the symbol to the right one space to allow for separator bars */ for(i = (symbol->width + 1); i >= 1; i--) { symbol->encoded_data[symbol->rows - 1][i] = symbol->encoded_data[symbol->rows - 1][i - 1]; } symbol->encoded_data[symbol->rows - 1][0] = '0'; symbol->width += 2; break; } if((symbol->errtxt[0] == 'w') && (errno == 0)) { errno = 1; /* flag UPC-E warnings */ } return errno; }