--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/zint/backend/bc412.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,152 @@
+/* bc412.c - Handles IBM BC412 (SEMI T1-95) symbology */
+/*
+    libzint - the open source barcode library
+    Copyright (C) 2022-2024 Robin Stuart <rstuart114@gmail.com>
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+    3. Neither the name of the project nor the names of its contributors
+       may be used to endorse or promote products derived from this software
+       without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+    ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+    OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+    SUCH DAMAGE.
+ */
+/* SPDX-License-Identifier: BSD-3-Clause */
+
+/* A little information about this symbology can be found at
+ * https://barcodeguide.seagullscientific.com/Content/Symbologies/BC412.htm
+ *
+ * Partial specification at
+ * https://www.wdfxw.net/doc80487518.htm
+ *
+ * Checked against the encoder at
+ * https://www.barcodesoft.com/en/semi/semi-t1-95-bc-412-code */
+
+#include <stdio.h>
+#include "common.h"
+
+static const char BROMINE[] = "0R9GLVHA8EZ4NTS1J2Q6C7DYKBUIX3FWP5M";
+
+static const char BC412Table[35][8] = {
+    {'1','1','1','1','1','1','1','5'}, {'1','3','1','1','1','2','1','2'},
+    {'1','1','1','3','1','1','1','3'}, {'1','2','1','1','1','2','1','3'},
+    {'1','2','1','2','1','3','1','1'}, {'1','3','1','3','1','1','1','1'},
+    {'1','2','1','1','1','3','1','2'}, {'1','1','1','3','1','2','1','2'},
+    {'1','1','1','2','1','4','1','1'}, {'1','1','1','5','1','1','1','1'},
+    {'1','5','1','1','1','1','1','1'}, {'1','1','1','1','1','5','1','1'},
+    {'1','2','1','3','1','2','1','1'}, {'1','3','1','2','1','1','1','2'},
+    {'1','3','1','1','1','3','1','1'}, {'1','1','1','1','1','2','1','4'},
+    {'1','2','1','2','1','1','1','3'}, {'1','1','1','1','1','3','1','3'},
+    {'1','3','1','1','1','1','1','3'}, {'1','1','1','2','1','2','1','3'},
+    {'1','1','1','4','1','1','1','2'}, {'1','1','1','2','1','3','1','2'},
+    {'1','1','1','4','1','2','1','1'}, {'1','4','1','2','1','1','1','1'},
+    {'1','2','1','2','1','2','1','2'}, {'1','1','1','3','1','3','1','1'},
+    {'1','3','1','2','1','2','1','1'}, {'1','2','1','1','1','4','1','1'},
+    {'1','4','1','1','1','2','1','1'}, {'1','1','1','1','1','4','1','2'},
+    {'1','2','1','1','1','1','1','4'}, {'1','4','1','1','1','1','1','2'},
+    {'1','2','1','4','1','1','1','1'}, {'1','1','1','2','1','1','1','4'},
+    {'1','2','1','3','1','1','1','2'}
+};
+
+INTERNAL int bc412(struct zint_symbol *symbol, unsigned char source[], int length) { /* IBM BC412 */
+    unsigned char padded_source[20];
+    int posns[35];
+    int i, counter_odd = 0, counter_even = 0, check_sum = 0;
+    char dest[293]; /* 2 + (36 * 8) + 3 */
+    char *d = dest;
+    int error_number = 0;
+
+    if (length > 18) {
+        return errtxtf(ZINT_ERROR_TOO_LONG, symbol, 790, "Input length %d too long (maximum 18)", length);
+    }
+    if (length < 7) {
+        return errtxtf(ZINT_ERROR_TOO_LONG, symbol, 792, "Input length %d too short (minimum 7)", length);
+    }
+    to_upper(source, length);
+
+    padded_source[0] = source[0];
+    padded_source[1] = '0';
+
+    for (i = 2; i <= length; i++) {
+        padded_source[i] = source[i - 1];
+    }
+    padded_source[length + 1] = 0;
+
+    if ((i = not_sane_lookup(BROMINE, 35, padded_source, length + 1, posns))) {
+        return errtxtf(ZINT_ERROR_INVALID_DATA, symbol, 791,
+                        "Invalid character at position %d in input (alphanumerics only, excluding \"O\")", i - 1);
+    }
+
+    for (i = 0; i <= length; i++) {
+        if (i % 2) {
+            counter_even += posns[i];
+        } else {
+            counter_odd += posns[i];
+        }
+    }
+
+    counter_odd %= 35;
+    counter_even %= 35;
+
+    /* Check digit */
+    check_sum = counter_odd + (2 * counter_even);
+    check_sum %= 35;
+    check_sum *= 17;
+    check_sum %= 35;
+
+    if (symbol->debug & ZINT_DEBUG_PRINT) {
+        printf("BC412 check: %c\n", BROMINE[check_sum]);
+    }
+
+    padded_source[1] = BROMINE[check_sum];
+    posns[1] = check_sum;
+
+    /* Start character */
+    memcpy(d, "12", 2);
+    d += 2;
+
+    for (i = 0; i <= length; i++, d += 8) {
+        memcpy(d, BC412Table[posns[i]], 8);
+    }
+
+    /* Stop character */
+    memcpy(d, "111", 3);
+    d += 3;
+
+    expand(symbol, dest, d - dest);
+    ustrcpy(symbol->text, padded_source);
+
+    if (symbol->output_options & COMPLIANT_HEIGHT) {
+        /* SEMI T1-95 Table 1 "Module" (Character) Height 2mm ± 0.025mm, using Module Spacing 0.12mm ± 0.025mm as
+           X-dimension */
+        const float min_height = 13.6206894f; /* 1.975 / 0.145 */
+        const float default_height = 16.666666f; /* 2.0 / 0.12 */
+        const float max_height = 21.3157902f; /* 2.025 / 0.095 */
+        error_number = set_height(symbol, min_height, default_height, max_height, 0 /*no_errtxt*/);
+    } else {
+        /* Using compliant height as default as no backwards compatibility to consider */
+        const float default_height = 16.666666f; /* 2.0 / 0.12 */
+        (void) set_height(symbol, 0.0f, default_height, 0.0f, 1 /*no_errtxt*/);
+    }
+
+    return error_number;
+}
+
+/* vim: set ts=4 sw=4 et : */