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318 lines
9.3 KiB
C
318 lines
9.3 KiB
C
/* common.c - Contains functions needed for a number of barcodes */
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/*
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libzint - the open source barcode library
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Copyright (C) 2008-2017 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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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "common.h"
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/* Local replacement for strlen() with unsigned char strings */
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size_t ustrlen(const unsigned char data[]) {
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return strlen((const char*) data);
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}
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/* Converts a character 0-9 to its equivalent integer value */
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int ctoi(const char source) {
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if ((source >= '0') && (source <= '9'))
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return (source - '0');
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return (source - 'A' + 10);
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}
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/* Convert an integer value to a string representing its binary equivalent */
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void bin_append(const int arg, const int length, char *binary) {
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int i;
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int start;
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size_t posn = strlen(binary);
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start = 0x01 << (length - 1);
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for (i = 0; i < length; i++) {
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binary[posn + i] = '0';
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if (arg & (start >> i)) {
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binary[posn + i] = '1';
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}
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}
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binary[posn + length] = '\0';
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return;
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}
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/* Converts an integer value to its hexadecimal character */
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char itoc(const int source) {
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if ((source >= 0) && (source <= 9)) {
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return ('0' + source);
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} else {
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return ('A' + (source - 10));
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}
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}
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/* Converts lower case characters to upper case in a string source[] */
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void to_upper(unsigned char source[]) {
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size_t i, src_len = ustrlen(source);
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for (i = 0; i < src_len; i++) {
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if ((source[i] >= 'a') && (source[i] <= 'z')) {
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source [i] = (source[i] - 'a') + 'A';
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}
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}
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}
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/* Verifies that a string only uses valid characters */
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int is_sane(const char test_string[], const unsigned char source[], const size_t length) {
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unsigned int j, latch;
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size_t i, lt = strlen(test_string);
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for (i = 0; i < length; i++) {
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latch = FALSE;
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for (j = 0; j < lt; j++) {
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if (source[i] == test_string[j]) {
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latch = TRUE;
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break;
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}
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}
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if (!(latch)) {
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return ZINT_ERROR_INVALID_DATA;
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}
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}
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return 0;
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}
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/* Replaces huge switch statements for looking up in tables */
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void lookup(const char set_string[], const char *table[], const char data, char dest[]) {
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size_t i, n = strlen(set_string);
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for (i = 0; i < n; i++) {
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if (data == set_string[i]) {
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strcat(dest, table[i]);
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}
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}
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}
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/* Returns the position of data in set_string */
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int posn(const char set_string[], const char data) {
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int i, n = (int)strlen(set_string);
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for (i = 0; i < n; i++) {
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if (data == set_string[i]) {
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return i;
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}
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}
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return -1;
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}
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/* Return true (1) if a module is dark/black, otherwise false (0) */
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int module_is_set(const struct zint_symbol *symbol, const int y_coord, const int x_coord) {
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return (symbol->encoded_data[y_coord][x_coord / 7] >> (x_coord % 7)) & 1;
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}
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/* Set a module to dark/black */
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void set_module(struct zint_symbol *symbol, const int y_coord, const int x_coord) {
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symbol->encoded_data[y_coord][x_coord / 7] |= 1 << (x_coord % 7);
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}
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/* Set (or unset) a module to white */
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void unset_module(struct zint_symbol *symbol, const int y_coord, const int x_coord) {
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symbol->encoded_data[y_coord][x_coord / 7] &= ~(1 << (x_coord % 7));
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}
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/* Expands from a width pattern to a bit pattern */
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void expand(struct zint_symbol *symbol, const char data[]) {
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size_t reader, n = strlen(data);
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int writer, i;
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char latch;
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writer = 0;
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latch = '1';
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for (reader = 0; reader < n; reader++) {
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for (i = 0; i < ctoi(data[reader]); i++) {
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if (latch == '1') {
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set_module(symbol, symbol->rows, writer);
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}
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writer++;
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}
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latch = (latch == '1' ? '0' : '1');
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}
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if (symbol->symbology != BARCODE_PHARMA) {
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if (writer > symbol->width) {
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symbol->width = writer;
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}
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} else {
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/* Pharmacode One ends with a space - adjust for this */
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if (writer > symbol->width + 2) {
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symbol->width = writer - 2;
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}
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}
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symbol->rows = symbol->rows + 1;
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}
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/* Indicates which symbologies can have row binding */
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int is_stackable(const int symbology) {
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if (symbology < BARCODE_PDF417) {
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return 1;
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}
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switch (symbology) {
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case BARCODE_CODE128B:
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case BARCODE_ISBNX:
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case BARCODE_EAN14:
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case BARCODE_NVE18:
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case BARCODE_KOREAPOST:
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case BARCODE_PLESSEY:
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case BARCODE_TELEPEN_NUM:
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case BARCODE_ITF14:
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case BARCODE_CODE32:
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case BARCODE_CODABLOCKF:
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return 1;
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}
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return 0;
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}
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/* Indicates which symbols can have addon (EAN-2 and EAN-5) */
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int is_extendable(const int symbology) {
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if (symbology == BARCODE_EANX) {
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return 1;
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}
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if (symbology == BARCODE_UPCA) {
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return 1;
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}
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if (symbology == BARCODE_UPCE) {
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return 1;
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}
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if (symbology == BARCODE_ISBNX) {
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return 1;
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}
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if (symbology == BARCODE_UPCA_CC) {
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return 1;
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}
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if (symbology == BARCODE_UPCE_CC) {
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return 1;
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}
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if (symbology == BARCODE_EANX_CC) {
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return 1;
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}
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return 0;
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}
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int istwodigits(const unsigned char source[], const size_t position) {
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if ((source[position] >= '0') && (source[position] <= '9')) {
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if ((source[position + 1] >= '0') && (source[position + 1] <= '9')) {
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return 1;
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}
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}
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return 0;
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}
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int utf8toutf16(struct zint_symbol *symbol, const unsigned char source[], int vals[], size_t *length) {
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size_t bpos;
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int jpos, error_number;
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int next;
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bpos = 0;
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jpos = 0;
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error_number = 0;
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next = 0;
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do {
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if (source[bpos] <= 0x7f) {
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/* 1 byte mode (7-bit ASCII) */
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vals[jpos] = source[bpos];
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next = bpos + 1;
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jpos++;
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} else {
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if ((source[bpos] >= 0x80) && (source[bpos] <= 0xbf)) {
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strcpy(symbol->errtxt, "240: Corrupt Unicode data");
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return ZINT_ERROR_INVALID_DATA;
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}
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if ((source[bpos] >= 0xc0) && (source[bpos] <= 0xc1)) {
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strcpy(symbol->errtxt, "241: Overlong encoding not supported");
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return ZINT_ERROR_INVALID_DATA;
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}
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if ((source[bpos] >= 0xc2) && (source[bpos] <= 0xdf)) {
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/* 2 byte mode */
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vals[jpos] = ((source[bpos] & 0x1f) << 6) + (source[bpos + 1] & 0x3f);
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next = bpos + 2;
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jpos++;
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} else
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if ((source[bpos] >= 0xe0) && (source[bpos] <= 0xef)) {
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/* 3 byte mode */
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vals[jpos] = ((source[bpos] & 0x0f) << 12) + ((source[bpos + 1] & 0x3f) << 6) + (source[bpos + 2] & 0x3f);
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next = bpos + 3;
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jpos++;
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} else
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if (source[bpos] >= 0xf0) {
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strcpy(symbol->errtxt, "242: Unicode sequences of more than 3 bytes not supported");
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return ZINT_ERROR_INVALID_DATA;
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}
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}
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bpos = next;
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} while (bpos < *length);
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*length = jpos;
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return error_number;
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}
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void set_minimum_height(struct zint_symbol *symbol, const int min_height) {
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/* Enforce minimum permissable height of rows */
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int fixed_height = 0;
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int zero_count = 0;
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int i;
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for (i = 0; i < symbol->rows; i++) {
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fixed_height += symbol->row_height[i];
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if (symbol->row_height[i] == 0) {
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zero_count++;
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}
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}
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if (zero_count > 0) {
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if (((symbol->height - fixed_height) / zero_count) < min_height) {
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for (i = 0; i < symbol->rows; i++) {
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if (symbol->row_height[i] == 0) {
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symbol->row_height[i] = min_height;
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}
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}
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}
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}
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}
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