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187 lines
8.9 KiB
C
187 lines
8.9 KiB
C
/* general_field.c - Handles general field compaction (GS1 DataBar and composites) */
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/*
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libzint - the open source barcode library
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Copyright (C) 2019 - 2020 Robin Stuart <rstuart114@gmail.com>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the project nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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*/
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/* vim: set ts=4 sw=4 et : */
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#include "common.h"
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#include "general_field.h"
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static char alphanum_puncs[] = "*,-./";
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static char isoiec_puncs[] = "!\"%&'()*+,-./:;<=>?_ ";
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/* Returns type of char at `i`. FNC1 counted as NUMERIC. Returns 0 if invalid char */
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static int general_field_type(char *general_field, int i) {
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if (general_field[i] == '[' || (general_field[i] >= '0' && general_field[i] <= '9')) {
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return NUMERIC;
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}
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if ((general_field[i] >= 'A' && general_field[i] <= 'Z') || strchr(alphanum_puncs, general_field[i])) {
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return ALPHANUMERIC;
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}
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if ((general_field[i] >= 'a' && general_field[i] <= 'z') || strchr(isoiec_puncs, general_field[i])) {
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return ISOIEC;
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}
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return 0;
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}
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/* Returns true if next (including `i`) `num` chars of type `type`, or if given (non-zero), `type2` */
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static int general_field_next(char *general_field, int i, int general_field_len, int num, int type, int type2) {
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if (i + num > general_field_len) {
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return 0;
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}
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for (; i < general_field_len && num; i++, num--) {
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int type_i = general_field_type(general_field, i);
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if ((type_i != type && !type2) || (type_i != type && type_i != type2)) {
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return 0;
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}
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}
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return num == 0;
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}
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/* Returns true if next (including `i`) `num` up to `max_num` chars of type `type` and occur at end */
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static int general_field_next_terminate(char *general_field, int i, int general_field_len, int num, int max_num, int type) {
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if (i + max_num < general_field_len) {
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return 0;
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}
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for (; i < general_field_len; i++, num--) {
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if (general_field_type(general_field, i) != type) {
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return 0;
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}
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}
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return i == general_field_len && num <= 0;
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}
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/* Returns true if none of the next (including `i`) `num` chars (or end occurs) of type `type` */
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static int general_field_next_none(char *general_field, int i, int general_field_len, int num, int type) {
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for (; i < general_field_len && num; i++, num--) {
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if (general_field_type(general_field, i) == type) {
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return 0;
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}
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}
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return num == 0 || i == general_field_len;
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}
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/* Attempts to apply encoding rules from sections 7.2.5.5.1 to 7.2.5.5.3
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* of ISO/IEC 24724:2011 (same as sections 5.4.1 to 5.4.3 of ISO/IEC 24723:2010) */
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INTERNAL int general_field_encode(char *general_field, int *p_mode, int *p_last_digit, char binary_string[]) {
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int i, d1, d2;
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int mode = *p_mode;
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int last_digit = 0; /* Set to odd remaining digit at end if any */
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int general_field_len = strlen(general_field);
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for (i = 0; i < general_field_len; ) {
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int type = general_field_type(general_field, i);
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if (!type) {
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return 0;
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}
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switch (mode) {
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case NUMERIC:
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if (i < general_field_len - 1) { /* If at least 2 characters remain */
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if (type != NUMERIC || general_field_type(general_field, i + 1) != NUMERIC) { /* 7.2.5.5.1/5.4.1 a) */
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strcat(binary_string, "0000"); /* Alphanumeric latch */
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mode = ALPHANUMERIC;
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} else {
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d1 = general_field[i] == '[' ? 10 : ctoi(general_field[i]);
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d2 = general_field[i + 1] == '[' ? 10 : ctoi(general_field[i + 1]);
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bin_append((11 * d1) + d2 + 8, 7, binary_string);
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i += 2;
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}
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} else { /* If 1 character remains */
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if (type != NUMERIC) { /* 7.2.5.5.1/5.4.1 b) */
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strcat(binary_string, "0000"); /* Alphanumeric latch */
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mode = ALPHANUMERIC;
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} else {
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last_digit = general_field[i]; /* Ending with single digit. 7.2.5.5.1 c) and 5.4.1 c) dealt with separately outside this procedure */
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i++;
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}
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}
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break;
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case ALPHANUMERIC:
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if (general_field[i] == '[') { /* 7.2.5.5.2/5.4.2 a) */
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strcat(binary_string, "01111");
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mode = NUMERIC;
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i++;
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} else if (type == ISOIEC) { /* 7.2.5.5.2/5.4.2 b) */
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strcat(binary_string, "00100"); /* ISO/IEC 646 latch */
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mode = ISOIEC;
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} else if (general_field_next(general_field, i, general_field_len, 6, NUMERIC, 0)) { /* 7.2.5.5.2/5.4.2 c) */
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strcat(binary_string, "000"); /* Numeric latch */
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mode = NUMERIC;
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} else if (general_field_next_terminate(general_field, i, general_field_len, 4, 5 /*Can limit to 5 max due to above*/, NUMERIC)) { /* 7.2.5.5.2/5.4.2 d) */
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strcat(binary_string, "000"); /* Numeric latch */
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mode = NUMERIC;
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} else if ((general_field[i] >= '0') && (general_field[i] <= '9')) {
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bin_append(general_field[i] - 43, 5, binary_string);
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i++;
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} else if ((general_field[i] >= 'A') && (general_field[i] <= 'Z')) {
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bin_append(general_field[i] - 33, 6, binary_string);
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i++;
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} else {
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bin_append(posn(alphanum_puncs, general_field[i]) + 58, 6, binary_string);
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i++;
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}
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break;
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case ISOIEC:
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if (general_field[i] == '[') { /* 7.2.5.5.3/5.4.3 a) */
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strcat(binary_string, "01111");
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mode = NUMERIC;
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i++;
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} else {
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int next_10_not_isoiec = general_field_next_none(general_field, i, general_field_len, 10, ISOIEC);
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if (next_10_not_isoiec && general_field_next(general_field, i, general_field_len, 4, NUMERIC, 0)) { /* 7.2.5.5.3/5.4.3 b) */
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strcat(binary_string, "000"); /* Numeric latch */
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mode = NUMERIC;
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} else if (next_10_not_isoiec && general_field_next(general_field, i, general_field_len, 5, ALPHANUMERIC, NUMERIC)) { /* 7.2.5.5.3/5.4.3 c) */
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/* Note this rule can produce longer bitstreams if most of the alphanumerics are numeric */
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strcat(binary_string, "00100"); /* Alphanumeric latch */
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mode = ALPHANUMERIC;
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} else if ((general_field[i] >= '0') && (general_field[i] <= '9')) {
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bin_append(general_field[i] - 43, 5, binary_string);
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i++;
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} else if ((general_field[i] >= 'A') && (general_field[i] <= 'Z')) {
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bin_append(general_field[i] - 1, 7, binary_string);
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i++;
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} else if ((general_field[i] >= 'a') && (general_field[i] <= 'z')) {
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bin_append(general_field[i] - 7, 7, binary_string);
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i++;
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} else {
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bin_append(posn(isoiec_puncs, general_field[i]) + 232, 8, binary_string);
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i++;
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}
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}
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break;
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}
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}
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*p_mode = mode;
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*p_last_digit = last_digit;
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return 1;
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}
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