--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/openjpeg/src/lib/openjp2/bio.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,211 @@
+/*
+ * The copyright in this software is being made available under the 2-clauses
+ * BSD License, included below. This software may be subject to other third
+ * party and contributor rights, including patent rights, and no such rights
+ * are granted under this license.
+ *
+ * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
+ * Copyright (c) 2002-2014, Professor Benoit Macq
+ * Copyright (c) 2001-2003, David Janssens
+ * Copyright (c) 2002-2003, Yannick Verschueren
+ * Copyright (c) 2003-2007, Francois-Olivier Devaux
+ * Copyright (c) 2003-2014, Antonin Descampe
+ * Copyright (c) 2005, Herve Drolon, FreeImage Team
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * 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.
+ */
+
+#include "opj_includes.h"
+
+/** @defgroup BIO BIO - Individual bit input-output stream */
+/*@{*/
+
+/** @name Local static functions */
+/*@{*/
+
+/**
+Read a bit
+@param bio BIO handle
+@return Returns the read bit
+*/
+static OPJ_UINT32 opj_bio_getbit(opj_bio_t *bio);
+/**
+Write a byte
+@param bio BIO handle
+@return Returns OPJ_TRUE if successful, returns OPJ_FALSE otherwise
+*/
+static OPJ_BOOL opj_bio_byteout(opj_bio_t *bio);
+/**
+Read a byte
+@param bio BIO handle
+@return Returns OPJ_TRUE if successful, returns OPJ_FALSE otherwise
+*/
+static OPJ_BOOL opj_bio_bytein(opj_bio_t *bio);
+
+/*@}*/
+
+/*@}*/
+
+/*
+==========================================================
+   local functions
+==========================================================
+*/
+
+static OPJ_BOOL opj_bio_byteout(opj_bio_t *bio)
+{
+    bio->buf = (bio->buf << 8) & 0xffff;
+    bio->ct = bio->buf == 0xff00 ? 7 : 8;
+    if ((OPJ_SIZE_T)bio->bp >= (OPJ_SIZE_T)bio->end) {
+        return OPJ_FALSE;
+    }
+    *bio->bp++ = (OPJ_BYTE)(bio->buf >> 8);
+    return OPJ_TRUE;
+}
+
+static OPJ_BOOL opj_bio_bytein(opj_bio_t *bio)
+{
+    bio->buf = (bio->buf << 8) & 0xffff;
+    bio->ct = bio->buf == 0xff00 ? 7 : 8;
+    if ((OPJ_SIZE_T)bio->bp >= (OPJ_SIZE_T)bio->end) {
+        return OPJ_FALSE;
+    }
+    bio->buf |= *bio->bp++;
+    return OPJ_TRUE;
+}
+
+static OPJ_UINT32 opj_bio_getbit(opj_bio_t *bio)
+{
+    if (bio->ct == 0) {
+        opj_bio_bytein(
+            bio); /* MSD: why not check the return value of this function ? */
+    }
+    bio->ct--;
+    return (bio->buf >> bio->ct) & 1;
+}
+
+/*
+==========================================================
+   Bit Input/Output interface
+==========================================================
+*/
+
+opj_bio_t* opj_bio_create(void)
+{
+    opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t));
+    return bio;
+}
+
+void opj_bio_destroy(opj_bio_t *bio)
+{
+    if (bio) {
+        opj_free(bio);
+    }
+}
+
+ptrdiff_t opj_bio_numbytes(opj_bio_t *bio)
+{
+    return (bio->bp - bio->start);
+}
+
+void opj_bio_init_enc(opj_bio_t *bio, OPJ_BYTE *bp, OPJ_UINT32 len)
+{
+    bio->start = bp;
+    bio->end = bp + len;
+    bio->bp = bp;
+    bio->buf = 0;
+    bio->ct = 8;
+}
+
+void opj_bio_init_dec(opj_bio_t *bio, OPJ_BYTE *bp, OPJ_UINT32 len)
+{
+    bio->start = bp;
+    bio->end = bp + len;
+    bio->bp = bp;
+    bio->buf = 0;
+    bio->ct = 0;
+}
+
+void opj_bio_putbit(opj_bio_t *bio, OPJ_UINT32 b)
+{
+    if (bio->ct == 0) {
+        opj_bio_byteout(
+            bio); /* MSD: why not check the return value of this function ? */
+    }
+    bio->ct--;
+    bio->buf |= b << bio->ct;
+}
+
+void opj_bio_write(opj_bio_t *bio, OPJ_UINT32 v, OPJ_UINT32 n)
+{
+    OPJ_INT32 i;
+
+    assert((n > 0U) && (n <= 32U));
+    for (i = (OPJ_INT32)n - 1; i >= 0; i--) {
+        opj_bio_putbit(bio, (v >> i) & 1);
+    }
+}
+
+OPJ_UINT32 opj_bio_read(opj_bio_t *bio, OPJ_UINT32 n)
+{
+    OPJ_INT32 i;
+    OPJ_UINT32 v;
+
+    assert((n > 0U) /* && (n <= 32U)*/);
+#ifdef OPJ_UBSAN_BUILD
+    /* This assert fails for some corrupted images which are gracefully rejected */
+    /* Add this assert only for ubsan build. */
+    /* This is the condition for overflow not to occur below which is needed because of OPJ_NOSANITIZE */
+    assert(n <= 32U);
+#endif
+    v = 0U;
+    for (i = (OPJ_INT32)n - 1; i >= 0; i--) {
+        v |= opj_bio_getbit(bio) <<
+             i; /* can't overflow, opj_bio_getbit returns 0 or 1 */
+    }
+    return v;
+}
+
+OPJ_BOOL opj_bio_flush(opj_bio_t *bio)
+{
+    if (! opj_bio_byteout(bio)) {
+        return OPJ_FALSE;
+    }
+    if (bio->ct == 7) {
+        if (! opj_bio_byteout(bio)) {
+            return OPJ_FALSE;
+        }
+    }
+    return OPJ_TRUE;
+}
+
+OPJ_BOOL opj_bio_inalign(opj_bio_t *bio)
+{
+    if ((bio->buf & 0xff) == 0xff) {
+        if (! opj_bio_bytein(bio)) {
+            return OPJ_FALSE;
+        }
+    }
+    bio->ct = 0;
+    return OPJ_TRUE;
+}