From a161207f023cc5a6eb4bba281fff8128b5dd1df7 Mon Sep 17 00:00:00 2001
From: Sasha Szpakowski <slime73@gmail.com>
Date: Sun, 28 May 2023 12:30:32 -0300
Subject: [PATCH] update PhysFS to 3.2.0.

Fixes #1880.
---
 src/libraries/physfs/physfs.c                 | 125 +++++++++++++-----
 src/libraries/physfs/physfs.h                 |  44 +++++-
 src/libraries/physfs/physfs_archiver_7z.c     |  11 +-
 src/libraries/physfs/physfs_archiver_grp.c    |   2 +-
 src/libraries/physfs/physfs_archiver_hog.c    |  78 +++++++++--
 .../physfs/physfs_archiver_iso9660.c          |   5 +-
 src/libraries/physfs/physfs_archiver_mvl.c    |   2 +-
 src/libraries/physfs/physfs_archiver_qpak.c   |   3 +-
 src/libraries/physfs/physfs_archiver_slb.c    |   5 +-
 .../physfs/physfs_archiver_unpacked.c         |   4 +-
 src/libraries/physfs/physfs_archiver_vdf.c    |   3 +-
 src/libraries/physfs/physfs_archiver_wad.c    |   2 +-
 src/libraries/physfs/physfs_archiver_zip.c    |  16 ++-
 src/libraries/physfs/physfs_internal.h        |  67 ++++++++--
 src/libraries/physfs/physfs_lzmasdk.h         |   3 +
 src/libraries/physfs/physfs_miniz.h           |  18 ++-
 .../physfs/physfs_platform_android.c          | 117 ++++++++++++++++
 src/libraries/physfs/physfs_platform_apple.m  |  25 +++-
 src/libraries/physfs/physfs_platform_os2.c    |   8 +-
 src/libraries/physfs/physfs_platform_posix.c  |  48 +++++--
 src/libraries/physfs/physfs_platform_unix.c   |  16 ++-
 .../physfs/physfs_platform_windows.c          |  10 +-
 src/libraries/physfs/physfs_platforms.h       |  10 +-
 src/libraries/physfs/physfs_unicode.c         |  19 ++-
 src/modules/filesystem/physfs/Filesystem.cpp  |   7 +
 25 files changed, 522 insertions(+), 126 deletions(-)
 create mode 100644 src/libraries/physfs/physfs_platform_android.c

diff --git a/src/libraries/physfs/physfs.c b/src/libraries/physfs/physfs.c
index eec40b2bf..6476e0a7b 100644
--- a/src/libraries/physfs/physfs.c
+++ b/src/libraries/physfs/physfs.c
@@ -12,8 +12,6 @@
 #include "physfs_internal.h"
 
 #if defined(_MSC_VER)
-#include <stdarg.h>
-
 /* this code came from https://stackoverflow.com/a/8712996 */
 int __PHYSFS_msvc_vsnprintf(char *outBuf, size_t size, const char *format, va_list ap)
 {
@@ -104,8 +102,8 @@ static inline int __PHYSFS_atomicAdd(int *ptrval, const int val)
 {
     int retval;
     __PHYSFS_platformGrabMutex(stateLock);
+    *ptrval += val;
     retval = *ptrval;
-    *ptrval = retval + val;
     __PHYSFS_platformReleaseMutex(stateLock);
     return retval;
 } /* __PHYSFS_atomicAdd */
@@ -923,12 +921,12 @@ static DirHandle *openDirectory(PHYSFS_Io *io, const char *d, int forWriting)
             retval = tryOpenDir(io, *i, d, forWriting, &claimed);
     } /* else */
 
-    errcode = currentErrorCode();
+    errcode = claimed ? currentErrorCode() : PHYSFS_ERR_UNSUPPORTED;
 
     if ((!retval) && (created_io))
         io->destroy(io);
 
-    BAIL_IF(!retval, claimed ? errcode : PHYSFS_ERR_UNSUPPORTED, NULL);
+    BAIL_IF(!retval, errcode, NULL);
     return retval;
 } /* openDirectory */
 
@@ -1095,6 +1093,8 @@ static int freeDirHandle(DirHandle *dh, FileHandle *openList)
         BAIL_IF(i->dirHandle == dh, PHYSFS_ERR_FILES_STILL_OPEN, 0);
 
     dh->funcs->closeArchive(dh->opaque);
+
+    if (dh->root) allocator.Free(dh->root);
     allocator.Free(dh->dirName);
     allocator.Free(dh->mountPoint);
     allocator.Free(dh);
@@ -1233,7 +1233,9 @@ int PHYSFS_init(const char *argv0)
     if (!userDir) goto initFailed;
 
     /* Platform layer is required to append a dirsep. */
+    #ifndef __ANDROID__  /* it's an APK file, not a directory, on Android. */
     assert(baseDir[strlen(baseDir) - 1] == __PHYSFS_platformDirSeparator);
+    #endif
     assert(userDir[strlen(userDir) - 1] == __PHYSFS_platformDirSeparator);
 
     if (!initStaticArchivers()) goto initFailed;
@@ -1433,15 +1435,60 @@ char *__PHYSFS_strdup(const char *str)
 } /* __PHYSFS_strdup */
 
 
-PHYSFS_uint32 __PHYSFS_hashString(const char *str, size_t len)
+PHYSFS_uint32 __PHYSFS_hashString(const char *str)
 {
     PHYSFS_uint32 hash = 5381;
-    while (len--)
-        hash = ((hash << 5) + hash) ^ *(str++);
+    while (1)
+    {
+        const char ch = *(str++);
+        if (ch == 0)
+            break;
+        hash = ((hash << 5) + hash) ^ ch;
+    } /* while */
     return hash;
 } /* __PHYSFS_hashString */
 
 
+PHYSFS_uint32 __PHYSFS_hashStringCaseFold(const char *str)
+{
+    PHYSFS_uint32 hash = 5381;
+    while (1)
+    {
+        const PHYSFS_uint32 cp = __PHYSFS_utf8codepoint(&str);
+        if (cp == 0)
+            break;
+        else
+        {
+            PHYSFS_uint32 folded[3];
+            const int numbytes = (int) (PHYSFS_caseFold(cp, folded) * sizeof (PHYSFS_uint32));
+            const char *bytes = (const char *) folded;
+            int i;
+            for (i = 0; i < numbytes; i++)
+                hash = ((hash << 5) + hash) ^ *(bytes++);
+        } /* else */
+    } /* while */
+
+    return hash;
+} /* __PHYSFS_hashStringCaseFold */
+
+
+PHYSFS_uint32 __PHYSFS_hashStringCaseFoldUSAscii(const char *str)
+{
+    PHYSFS_uint32 hash = 5381;
+    while (1)
+    {
+        char ch = *(str++);
+        if (ch == 0)
+            break;
+        else if ((ch >= 'A') && (ch <= 'Z'))
+            ch -= ('A' - 'a');
+
+        hash = ((hash << 5) + hash) ^ ch;
+    } /* while */
+    return hash;
+} /* __PHYSFS_hashStringCaseFoldUSAscii */
+
+
 /* MAKE SURE you hold stateLock before calling this! */
 static int doRegisterArchiver(const PHYSFS_Archiver *_archiver)
 {
@@ -1733,10 +1780,10 @@ int PHYSFS_setRoot(const char *archive, const char *subdir)
                 if (i->root)
                     allocator.Free(i->root);
                 i->root = ptr;
-                i->rootlen = len;
+                i->rootlen = strlen(i->root);  /* in case sanitizePlatformIndependentPath changed subdir */
 
-                if (longest_root < len)
-                    longest_root = len;
+                if (longest_root < i->rootlen)
+                    longest_root = i->rootlen;
             } /* else */
 
             break;
@@ -2107,10 +2154,10 @@ static int verifyPath(DirHandle *h, char **_fname, int allowMissing)
     if (h->root)
     {
         const int isempty = (*fname == '\0');
-        fname -= h->rootlen - 1;
+        fname -= h->rootlen + (isempty ? 0 : 1);
         strcpy(fname, h->root);
         if (!isempty)
-            fname[h->rootlen - 2] = '/';
+            fname[h->rootlen] = '/';
         *_fname = fname;
     } /* if */
 
@@ -2187,7 +2234,12 @@ static int doMkdir(const char *_dname, char *dname)
             const int rc = h->funcs->stat(h->opaque, dname, &statbuf);
             if ((!rc) && (currentErrorCode() == PHYSFS_ERR_NOT_FOUND))
                 exists = 0;
-            retval = ((rc) && (statbuf.filetype == PHYSFS_FILETYPE_DIRECTORY));
+            /* verifyPath made sure that (dname) doesn't have symlinks if they aren't
+               allowed, but it's possible the mounted writeDir itself has symlinks in it,
+               (for example "/var" on iOS is a symlink, and the prefpath will be somewhere
+               under that)...if we mounted that writeDir, we must allow those symlinks here
+               unconditionally. */
+            retval = ( (rc) && ((statbuf.filetype == PHYSFS_FILETYPE_DIRECTORY) || (statbuf.filetype == PHYSFS_FILETYPE_SYMLINK)) );
         } /* if */
 
         if (!exists)
@@ -2265,10 +2317,10 @@ static DirHandle *getRealDirHandle(const char *_fname)
     BAIL_IF(!_fname, PHYSFS_ERR_INVALID_ARGUMENT, NULL);
 
     __PHYSFS_platformGrabMutex(stateLock);
-    len = strlen(_fname) + longest_root + 1;
+    len = strlen(_fname) + longest_root + 2;
     allocated_fname = __PHYSFS_smallAlloc(len);
     BAIL_IF_MUTEX(!allocated_fname, PHYSFS_ERR_OUT_OF_MEMORY, stateLock, NULL);
-    fname = allocated_fname + longest_root;
+    fname = allocated_fname + longest_root + 1;
     if (sanitizePlatformIndependentPath(_fname, fname))
     {
         DirHandle *i;
@@ -2496,10 +2548,10 @@ int PHYSFS_enumerate(const char *_fn, PHYSFS_EnumerateCallback cb, void *data)
 
     __PHYSFS_platformGrabMutex(stateLock);
 
-    len = strlen(_fn) + longest_root + 1;
+    len = strlen(_fn) + longest_root + 2;
     allocated_fname = (char *) __PHYSFS_smallAlloc(len);
     BAIL_IF_MUTEX(!allocated_fname, PHYSFS_ERR_OUT_OF_MEMORY, stateLock, 0);
-    fname = allocated_fname + longest_root;
+    fname = allocated_fname + longest_root + 1;
     if (!sanitizePlatformIndependentPath(_fn, fname))
         retval = PHYSFS_ENUM_STOP;
     else
@@ -2702,10 +2754,10 @@ PHYSFS_File *PHYSFS_openRead(const char *_fname)
 
     BAIL_IF_MUTEX(!searchPath, PHYSFS_ERR_NOT_FOUND, stateLock, 0);
 
-    len = strlen(_fname) + longest_root + 1;
+    len = strlen(_fname) + longest_root + 2;
     allocated_fname = (char *) __PHYSFS_smallAlloc(len);
     BAIL_IF_MUTEX(!allocated_fname, PHYSFS_ERR_OUT_OF_MEMORY, stateLock, 0);
-    fname = allocated_fname + longest_root;
+    fname = allocated_fname + longest_root + 1;
 
     if (sanitizePlatformIndependentPath(_fname, fname))
     {
@@ -2731,13 +2783,15 @@ PHYSFS_File *PHYSFS_openRead(const char *_fname)
                 io->destroy(io);
                 PHYSFS_setErrorCode(PHYSFS_ERR_OUT_OF_MEMORY);
             } /* if */
-
-            memset(fh, '\0', sizeof (FileHandle));
-            fh->io = io;
-            fh->forReading = 1;
-            fh->dirHandle = i;
-            fh->next = openReadList;
-            openReadList = fh;
+            else
+            {
+                memset(fh, '\0', sizeof (FileHandle));
+                fh->io = io;
+                fh->forReading = 1;
+                fh->dirHandle = i;
+                fh->next = openReadList;
+                openReadList = fh;
+            } /* else */
         } /* if */
     } /* if */
 
@@ -3091,10 +3145,10 @@ int PHYSFS_stat(const char *_fname, PHYSFS_Stat *stat)
     stat->readonly = 1;
 
     __PHYSFS_platformGrabMutex(stateLock);
-    len = strlen(_fname) + longest_root + 1;
+    len = strlen(_fname) + longest_root + 2;
     allocated_fname = (char *) __PHYSFS_smallAlloc(len);
     BAIL_IF_MUTEX(!allocated_fname, PHYSFS_ERR_OUT_OF_MEMORY, stateLock, 0);
-    fname = allocated_fname + longest_root;
+    fname = allocated_fname + longest_root + 1;
 
     if (sanitizePlatformIndependentPath(_fname, fname))
     {
@@ -3227,7 +3281,7 @@ static void setDefaultAllocator(void)
 } /* setDefaultAllocator */
 
 
-int __PHYSFS_DirTreeInit(__PHYSFS_DirTree *dt, const size_t entrylen)
+int __PHYSFS_DirTreeInit(__PHYSFS_DirTree *dt, const size_t entrylen, const int case_sensitive, const int only_usascii)
 {
     static char rootpath[2] = { '/', '\0' };
     size_t alloclen;
@@ -3235,6 +3289,8 @@ int __PHYSFS_DirTreeInit(__PHYSFS_DirTree *dt, const size_t entrylen)
     assert(entrylen >= sizeof (__PHYSFS_DirTreeEntry));
 
     memset(dt, '\0', sizeof (*dt));
+    dt->case_sensitive = case_sensitive;
+    dt->only_usascii = only_usascii;
 
     dt->root = (__PHYSFS_DirTreeEntry *) allocator.Malloc(entrylen);
     BAIL_IF(!dt->root, PHYSFS_ERR_OUT_OF_MEMORY, 0);
@@ -3255,9 +3311,10 @@ int __PHYSFS_DirTreeInit(__PHYSFS_DirTree *dt, const size_t entrylen)
 } /* __PHYSFS_DirTreeInit */
 
 
-static inline PHYSFS_uint32 hashPathName(__PHYSFS_DirTree *dt, const char *name)
+static PHYSFS_uint32 hashPathName(__PHYSFS_DirTree *dt, const char *name)
 {
-    return __PHYSFS_hashString(name, strlen(name)) % dt->hashBuckets;
+    const PHYSFS_uint32 hashval = dt->case_sensitive ? __PHYSFS_hashString(name) : dt->only_usascii ? __PHYSFS_hashStringCaseFoldUSAscii(name) : __PHYSFS_hashStringCaseFold(name);
+    return hashval % dt->hashBuckets;
 } /* hashPathName */
 
 
@@ -3318,6 +3375,7 @@ void *__PHYSFS_DirTreeAdd(__PHYSFS_DirTree *dt, char *name, const int isdir)
 /* Find the __PHYSFS_DirTreeEntry for a path in platform-independent notation. */
 void *__PHYSFS_DirTreeFind(__PHYSFS_DirTree *dt, const char *path)
 {
+    const int cs = dt->case_sensitive;
     PHYSFS_uint32 hashval;
     __PHYSFS_DirTreeEntry *prev = NULL;
     __PHYSFS_DirTreeEntry *retval;
@@ -3328,7 +3386,8 @@ void *__PHYSFS_DirTreeFind(__PHYSFS_DirTree *dt, const char *path)
     hashval = hashPathName(dt, path);
     for (retval = dt->hash[hashval]; retval; retval = retval->hashnext)
     {
-        if (strcmp(retval->name, path) == 0)
+        const int cmp = cs ? strcmp(retval->name, path) : PHYSFS_utf8stricmp(retval->name, path);
+        if (cmp == 0)
         {
             if (prev != NULL)  /* move this to the front of the list */
             {
diff --git a/src/libraries/physfs/physfs.h b/src/libraries/physfs/physfs.h
index 49d49dae4..6e55ce4e5 100644
--- a/src/libraries/physfs/physfs.h
+++ b/src/libraries/physfs/physfs.h
@@ -145,7 +145,7 @@
  *   - .ISO (ISO9660 files, CD-ROM images)
  *   - .GRP (Build Engine groupfile archives)
  *   - .PAK (Quake I/II archive format)
- *   - .HOG (Descent I/II HOG file archives)
+ *   - .HOG (Descent I/II/III HOG file archives)
  *   - .MVL (Descent II movielib archives)
  *   - .WAD (DOOM engine archives)
  *   - .VDF (Gothic I/II engine archives)
@@ -225,7 +225,9 @@ extern "C" {
 
 #if defined(PHYSFS_DECL)
 /* do nothing. */
-#elif defined(_MSC_VER)
+#elif defined(PHYSFS_STATIC)
+#define PHYSFS_DECL   /**/
+#elif defined(_WIN32) || defined(__OS2__)
 #define PHYSFS_DECL __declspec(dllexport)
 #elif defined(__SUNPRO_C)
 #define PHYSFS_DECL __global
@@ -433,7 +435,7 @@ typedef struct PHYSFS_Version
 
 #ifndef DOXYGEN_SHOULD_IGNORE_THIS
 #define PHYSFS_VER_MAJOR 3
-#define PHYSFS_VER_MINOR 1
+#define PHYSFS_VER_MINOR 2
 #define PHYSFS_VER_PATCH 0
 #endif  /* DOXYGEN_SHOULD_IGNORE_THIS */
 
@@ -493,6 +495,14 @@ typedef struct PHYSFS_Version
 PHYSFS_DECL void PHYSFS_getLinkedVersion(PHYSFS_Version *ver);
 
 
+#ifdef __ANDROID__
+typedef struct PHYSFS_AndroidInit
+{
+    void *jnienv;
+    void *context;
+} PHYSFS_AndroidInit;
+#endif
+
 /**
  * \fn int PHYSFS_init(const char *argv0)
  * \brief Initialize the PhysicsFS library.
@@ -502,11 +512,22 @@ PHYSFS_DECL void PHYSFS_getLinkedVersion(PHYSFS_Version *ver);
  * This should be called prior to any attempts to change your process's
  *  current working directory.
  *
+ * \warning On Android, argv0 should be a non-NULL pointer to a
+ *          PHYSFS_AndroidInit struct. This struct must hold a valid JNIEnv *
+ *          and a JNI jobject of a Context (either the application context or
+ *          the current Activity is fine). Both are cast to a void * so we
+ *          don't need jni.h included wherever physfs.h is. PhysicsFS
+ *          uses these objects to query some system details. PhysicsFS does
+ *          not hold a reference to the JNIEnv or Context past the call to
+ *          PHYSFS_init(). If you pass a NULL here, PHYSFS_init can still
+ *          succeed, but PHYSFS_getBaseDir() and PHYSFS_getPrefDir() will be
+ *          incorrect.
+ *
  *   \param argv0 the argv[0] string passed to your program's mainline.
  *          This may be NULL on most platforms (such as ones without a
  *          standard main() function), but you should always try to pass
- *          something in here. Unix-like systems such as Linux _need_ to
- *          pass argv[0] from main() in here.
+ *          something in here. Many Unix-like systems _need_ to pass argv[0]
+ *          from main() in here. See warning about Android, too!
  *  \return nonzero on success, zero on error. Specifics of the error can be
  *          gleaned from PHYSFS_getLastError().
  *
@@ -762,6 +783,15 @@ PHYSFS_DECL char **PHYSFS_getCdRomDirs(void);
  *
  * You should probably use the base dir in your search path.
  *
+ * \warning On most platforms, this is a directory; on Android, this gives
+ *          you the path to the app's package (APK) file. As APK files are
+ *          just .zip files, you can mount them in PhysicsFS like regular
+ *          directories. You'll probably want to call
+ *          PHYSFS_setRoot(basedir, "/assets") after mounting to make your
+ *          app's actual data available directly without all the Android
+ *          metadata and directory offset. Note that if you passed a NULL to
+ *          PHYSFS_init(), you will not get the APK file here.
+ *
  *  \return READ ONLY string of base dir in platform-dependent notation.
  *
  * \sa PHYSFS_getPrefDir
@@ -2702,10 +2732,10 @@ typedef PHYSFS_EnumerateCallbackResult (*PHYSFS_EnumerateCallback)(void *data,
  *
  * \code
  *
- * static int printDir(void *data, const char *origdir, const char *fname)
+ * static PHYSFS_EnumerateCallbackResult printDir(void *data, const char *origdir, const char *fname)
  * {
  *     printf(" * We've got [%s] in [%s].\n", fname, origdir);
- *     return 1;  // give me more data, please.
+ *     return PHYSFS_ENUM_OK;  // give me more data, please.
  * }
  *
  * // ...
diff --git a/src/libraries/physfs/physfs_archiver_7z.c b/src/libraries/physfs/physfs_archiver_7z.c
index 914f69164..44be3c9a9 100644
--- a/src/libraries/physfs/physfs_archiver_7z.c
+++ b/src/libraries/physfs/physfs_archiver_7z.c
@@ -185,7 +185,7 @@ static int szipLoadEntries(SZIPinfo *info)
 {
     int retval = 0;
 
-    if (__PHYSFS_DirTreeInit(&info->tree, sizeof (SZIPentry)))
+    if (__PHYSFS_DirTreeInit(&info->tree, sizeof (SZIPentry), 1, 0))
     {
         const PHYSFS_uint32 count = info->db.NumFiles;
         PHYSFS_uint32 i;
@@ -285,13 +285,16 @@ static PHYSFS_Io *SZIP_openRead(void *opaque, const char *path)
                         &blockIndex, &outBuffer, &outBufferSize, &offset,
                         &outSizeProcessed, alloc, alloc);
     GOTO_IF(rc != SZ_OK, szipErrorCode(rc), SZIP_openRead_failed);
+    GOTO_IF(outBuffer == NULL, PHYSFS_ERR_OUT_OF_MEMORY, SZIP_openRead_failed);
 
     io->destroy(io);
     io = NULL;
 
-    buf = allocator.Malloc(outSizeProcessed);
-    GOTO_IF(rc != SZ_OK, PHYSFS_ERR_OUT_OF_MEMORY, SZIP_openRead_failed);
-    memcpy(buf, outBuffer + offset, outSizeProcessed);
+    buf = allocator.Malloc(outSizeProcessed ? outSizeProcessed : 1);
+    GOTO_IF(buf == NULL, PHYSFS_ERR_OUT_OF_MEMORY, SZIP_openRead_failed);
+
+    if (outSizeProcessed > 0)
+        memcpy(buf, outBuffer + offset, outSizeProcessed);
 
     alloc->Free(alloc, outBuffer);
     outBuffer = NULL;
diff --git a/src/libraries/physfs/physfs_archiver_grp.c b/src/libraries/physfs/physfs_archiver_grp.c
index 758475e49..9a2978a6c 100644
--- a/src/libraries/physfs/physfs_archiver_grp.c
+++ b/src/libraries/physfs/physfs_archiver_grp.c
@@ -76,7 +76,7 @@ static void *GRP_openArchive(PHYSFS_Io *io, const char *name,
     BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &count, sizeof(count)), NULL);
     count = PHYSFS_swapULE32(count);
 
-    unpkarc = UNPK_openArchive(io);
+    unpkarc = UNPK_openArchive(io, 0, 1);
     BAIL_IF_ERRPASS(!unpkarc, NULL);
 
     if (!grpLoadEntries(io, count, unpkarc))
diff --git a/src/libraries/physfs/physfs_archiver_hog.c b/src/libraries/physfs/physfs_archiver_hog.c
index 832209f86..a8184780a 100644
--- a/src/libraries/physfs/physfs_archiver_hog.c
+++ b/src/libraries/physfs/physfs_archiver_hog.c
@@ -1,9 +1,9 @@
 /*
  * HOG support routines for PhysicsFS.
  *
- * This driver handles Descent I/II HOG archives.
+ * This driver handles Descent I/II/III HOG archives.
  *
- * The format is very simple:
+ * The Descent I/II format is very simple:
  *
  *   The file always starts with the 3-byte signature "DHF" (Descent
  *   HOG file). After that the files of a HOG are just attached after
@@ -23,10 +23,23 @@
  *
  * (That info is from http://www.descent2.com/ddn/specs/hog/)
  *
+ * Descent 3 moved to HOG2 format, which starts with the chars "HOG2",
+ *  then 32-bits for the number of contained files, 32 bits for the offset
+ *  to the first file's data, then 56 bytes of 0xFF (reserved?). Then for
+ *  each file, there's 36 bytes for filename (null-terminated, rest of bytes
+ *  are garbage), 32-bits unknown/reserved (always zero?), 32-bits of length
+ *  of file data, 32-bits of time since Unix epoch. Then immediately following,
+ *  for each file is their uncompressed content, you can find its offset
+ *  by starting at the initial data offset and adding the filesize of each
+ *  prior file.
+ *
+ * This information was found at:
+ *  https://web.archive.org/web/20020213004051/http://descent-3.com/ddn/specs/hog/
+ *
+ *
  * Please see the file LICENSE.txt in the source's root directory.
  *
- *  This file written by Bradley Bell.
- *  Based on grp.c by Ryan C. Gordon.
+ * This file written by Bradley Bell and Ryan C. Gordon.
  */
 
 #define __PHYSICSFS_INTERNAL__
@@ -34,7 +47,15 @@
 
 #if PHYSFS_SUPPORTS_HOG
 
-static int hogLoadEntries(PHYSFS_Io *io, void *arc)
+static int readui32(PHYSFS_Io *io, PHYSFS_uint32 *val)
+{
+    PHYSFS_uint32 v;
+    BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &v, sizeof (v)), 0);
+    *val = PHYSFS_swapULE32(v);
+    return 1;
+} /* readui32 */
+
+static int hog1LoadEntries(PHYSFS_Io *io, void *arc)
 {
     const PHYSFS_uint64 iolen = io->length(io);
     PHYSFS_uint32 pos = 3;
@@ -45,11 +66,10 @@ static int hogLoadEntries(PHYSFS_Io *io, void *arc)
         char name[13];
 
         BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 13), 0);
-        BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &size, 4), 0);
+        BAIL_IF_ERRPASS(!readui32(io, &size), 0);
         name[12] = '\0';  /* just in case. */
         pos += 13 + 4;
 
-        size = PHYSFS_swapULE32(size);
         BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, -1, -1, pos, size), 0);
         pos += size;
 
@@ -60,24 +80,60 @@ static int hogLoadEntries(PHYSFS_Io *io, void *arc)
     return 1;
 } /* hogLoadEntries */
 
+static int hog2LoadEntries(PHYSFS_Io *io, void *arc)
+{
+    PHYSFS_uint32 numfiles;
+    PHYSFS_uint32 pos;
+    PHYSFS_uint32 i;
+
+    BAIL_IF_ERRPASS(!readui32(io, &numfiles), 0);
+    BAIL_IF_ERRPASS(!readui32(io, &pos), 0);
+    BAIL_IF_ERRPASS(!io->seek(io, 68), 0);  /* skip to end of header. */
+
+    for (i = 0; i < numfiles; i++) {
+        char name[37];
+        PHYSFS_uint32 reserved;
+        PHYSFS_uint32 size;
+        PHYSFS_uint32 mtime;
+        BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 36), 0);
+        BAIL_IF_ERRPASS(!readui32(io, &reserved), 0);
+        BAIL_IF_ERRPASS(!readui32(io, &size), 0);
+        BAIL_IF_ERRPASS(!readui32(io, &mtime), 0);
+        name[36] = '\0';  /* just in case */
+        BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, mtime, mtime, pos, size), 0);
+        pos += size;
+    }
+
+    return 1;
+} /* hog2LoadEntries */
+
 
 static void *HOG_openArchive(PHYSFS_Io *io, const char *name,
                              int forWriting, int *claimed)
 {
     PHYSFS_uint8 buf[3];
     void *unpkarc = NULL;
+    int hog1 = 0;
 
     assert(io != NULL);  /* shouldn't ever happen. */
     BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
     BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, 3), NULL);
-    BAIL_IF(memcmp(buf, "DHF", 3) != 0, PHYSFS_ERR_UNSUPPORTED, NULL);
+
+    if (memcmp(buf, "DHF", 3) == 0)
+        hog1 = 1;  /* original HOG (Descent 1 and 2) archive */
+    else
+    {
+        BAIL_IF(memcmp(buf, "HOG", 3) != 0, PHYSFS_ERR_UNSUPPORTED, NULL); /* Not HOG2 */
+        BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, 1), NULL);
+        BAIL_IF(buf[0] != '2', PHYSFS_ERR_UNSUPPORTED, NULL); /* Not HOG2 */
+    } /* else */
 
     *claimed = 1;
 
-    unpkarc = UNPK_openArchive(io);
+    unpkarc = UNPK_openArchive(io, 0, 1);
     BAIL_IF_ERRPASS(!unpkarc, NULL);
 
-    if (!hogLoadEntries(io, unpkarc))
+    if (!(hog1 ? hog1LoadEntries(io, unpkarc) : hog2LoadEntries(io, unpkarc)))
     {
         UNPK_abandonArchive(unpkarc);
         return NULL;
@@ -92,7 +148,7 @@ const PHYSFS_Archiver __PHYSFS_Archiver_HOG =
     CURRENT_PHYSFS_ARCHIVER_API_VERSION,
     {
         "HOG",
-        "Descent I/II HOG file format",
+        "Descent I/II/III HOG file format",
         "Bradley Bell <btb@icculus.org>",
         "https://icculus.org/physfs/",
         0,  /* supportsSymlinks */
diff --git a/src/libraries/physfs/physfs_archiver_iso9660.c b/src/libraries/physfs/physfs_archiver_iso9660.c
index 965c83f65..e92d677fe 100644
--- a/src/libraries/physfs/physfs_archiver_iso9660.c
+++ b/src/libraries/physfs/physfs_archiver_iso9660.c
@@ -251,7 +251,7 @@ static int parseVolumeDescriptor(PHYSFS_Io *io, PHYSFS_uint64 *_rootpos,
         pos += 2048;  /* each volume descriptor is 2048 bytes */
 
         BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &type, 1), 0);
-        BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &identifier, 5), 0);
+        BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, identifier, 5), 0);
 
         if (memcmp(identifier, "CD001", 5) != 0)  /* maybe not an iso? */
         {
@@ -346,7 +346,8 @@ static void *ISO9660_openArchive(PHYSFS_Io *io, const char *filename,
     if (!parseVolumeDescriptor(io, &rootpos, &len, &joliet, claimed))
         return NULL;
 
-    unpkarc = UNPK_openArchive(io);
+    /* !!! FIXME: check case_sensitive and only_usascii params for this archive. */
+    unpkarc = UNPK_openArchive(io, 1, 0);
     BAIL_IF_ERRPASS(!unpkarc, NULL);
 
     if (!iso9660LoadEntries(io, joliet, "", rootpos, rootpos + len, unpkarc))
diff --git a/src/libraries/physfs/physfs_archiver_mvl.c b/src/libraries/physfs/physfs_archiver_mvl.c
index 78b59f1a1..7a5c43262 100644
--- a/src/libraries/physfs/physfs_archiver_mvl.c
+++ b/src/libraries/physfs/physfs_archiver_mvl.c
@@ -70,7 +70,7 @@ static void *MVL_openArchive(PHYSFS_Io *io, const char *name,
     BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &count, sizeof(count)), NULL);
     count = PHYSFS_swapULE32(count);
 
-    unpkarc = UNPK_openArchive(io);
+    unpkarc = UNPK_openArchive(io, 0, 1);
     BAIL_IF_ERRPASS(!unpkarc, NULL);
 
     if (!mvlLoadEntries(io, count, unpkarc))
diff --git a/src/libraries/physfs/physfs_archiver_qpak.c b/src/libraries/physfs/physfs_archiver_qpak.c
index 15a5f2dfe..ddca271f6 100644
--- a/src/libraries/physfs/physfs_archiver_qpak.c
+++ b/src/libraries/physfs/physfs_archiver_qpak.c
@@ -86,7 +86,8 @@ static void *QPAK_openArchive(PHYSFS_Io *io, const char *name,
 
     BAIL_IF_ERRPASS(!io->seek(io, pos), NULL);
 
-    unpkarc = UNPK_openArchive(io);
+    /* !!! FIXME: check case_sensitive and only_usascii params for this archive. */
+    unpkarc = UNPK_openArchive(io, 1, 0);
     BAIL_IF_ERRPASS(!unpkarc, NULL);
 
     if (!qpakLoadEntries(io, count, unpkarc))
diff --git a/src/libraries/physfs/physfs_archiver_slb.c b/src/libraries/physfs/physfs_archiver_slb.c
index 4fc28d40c..58f3bc807 100644
--- a/src/libraries/physfs/physfs_archiver_slb.c
+++ b/src/libraries/physfs/physfs_archiver_slb.c
@@ -36,7 +36,7 @@ static int slbLoadEntries(PHYSFS_Io *io, const PHYSFS_uint32 count, void *arc)
         BAIL_IF(backslash != '\\', PHYSFS_ERR_CORRUPT, 0);
 
         /* read the rest of the buffer, 63 bytes */
-        BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &name, 63), 0);
+        BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 63), 0);
         name[63] = '\0'; /* in case the name lacks the null terminator */
 
         /* convert backslashes */
@@ -94,7 +94,8 @@ static void *SLB_openArchive(PHYSFS_Io *io, const char *name,
     /* seek to the table of contents */
     BAIL_IF_ERRPASS(!io->seek(io, tocPos), NULL);
 
-    unpkarc = UNPK_openArchive(io);
+    /* !!! FIXME: check case_sensitive and only_usascii params for this archive. */
+    unpkarc = UNPK_openArchive(io, 1, 0);
     BAIL_IF_ERRPASS(!unpkarc, NULL);
 
     if (!slbLoadEntries(io, count, unpkarc))
diff --git a/src/libraries/physfs/physfs_archiver_unpacked.c b/src/libraries/physfs/physfs_archiver_unpacked.c
index 575efef32..fbb12a041 100644
--- a/src/libraries/physfs/physfs_archiver_unpacked.c
+++ b/src/libraries/physfs/physfs_archiver_unpacked.c
@@ -285,12 +285,12 @@ void *UNPK_addEntry(void *opaque, char *name, const int isdir,
 } /* UNPK_addEntry */
 
 
-void *UNPK_openArchive(PHYSFS_Io *io)
+void *UNPK_openArchive(PHYSFS_Io *io, const int case_sensitive, const int only_usascii)
 {
     UNPKinfo *info = (UNPKinfo *) allocator.Malloc(sizeof (UNPKinfo));
     BAIL_IF(!info, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
 
-    if (!__PHYSFS_DirTreeInit(&info->tree, sizeof (UNPKentry)))
+    if (!__PHYSFS_DirTreeInit(&info->tree, sizeof (UNPKentry), case_sensitive, only_usascii))
     {
         allocator.Free(info);
         return NULL;
diff --git a/src/libraries/physfs/physfs_archiver_vdf.c b/src/libraries/physfs/physfs_archiver_vdf.c
index 99bbb2a60..6d3a23f8f 100644
--- a/src/libraries/physfs/physfs_archiver_vdf.c
+++ b/src/libraries/physfs/physfs_archiver_vdf.c
@@ -129,7 +129,8 @@ static void *VDF_openArchive(PHYSFS_Io *io, const char *name,
 
     BAIL_IF_ERRPASS(!io->seek(io, rootCatOffset), NULL);
 
-    unpkarc = UNPK_openArchive(io);
+    /* !!! FIXME: check case_sensitive and only_usascii params for this archive. */
+    unpkarc = UNPK_openArchive(io, 1, 0);
     BAIL_IF_ERRPASS(!unpkarc, NULL);
 
     if (!vdfLoadEntries(io, count, vdfDosTimeToEpoch(timestamp), unpkarc))
diff --git a/src/libraries/physfs/physfs_archiver_wad.c b/src/libraries/physfs/physfs_archiver_wad.c
index b094c5b82..d3ae04565 100644
--- a/src/libraries/physfs/physfs_archiver_wad.c
+++ b/src/libraries/physfs/physfs_archiver_wad.c
@@ -95,7 +95,7 @@ static void *WAD_openArchive(PHYSFS_Io *io, const char *name,
 
     BAIL_IF_ERRPASS(!io->seek(io, directoryOffset), 0);
 
-    unpkarc = UNPK_openArchive(io);
+    unpkarc = UNPK_openArchive(io, 0, 1);
     BAIL_IF_ERRPASS(!unpkarc, NULL);
 
     if (!wadLoadEntries(io, count, unpkarc))
diff --git a/src/libraries/physfs/physfs_archiver_zip.c b/src/libraries/physfs/physfs_archiver_zip.c
index 9972628fd..7327a6195 100644
--- a/src/libraries/physfs/physfs_archiver_zip.c
+++ b/src/libraries/physfs/physfs_archiver_zip.c
@@ -15,6 +15,11 @@
 #include <errno.h>
 #include <time.h>
 
+#if (PHYSFS_BYTEORDER == PHYSFS_LIL_ENDIAN)
+#define MINIZ_LITTLE_ENDIAN 1
+#else
+#define MINIZ_LITTLE_ENDIAN 0
+#endif
 #include "physfs_miniz.h"
 
 /*
@@ -568,7 +573,7 @@ static PHYSFS_sint64 zip_find_end_of_central_dir(PHYSFS_Io *io, PHYSFS_sint64 *l
         {
             if (!__PHYSFS_readAll(io, buf, maxread - 4))
                 return -1;
-            memcpy(&buf[maxread - 4], &extra, sizeof (extra));
+            memcpy(&buf[maxread - 4], extra, sizeof (extra));
             totalread += maxread - 4;
         } /* if */
         else
@@ -578,7 +583,7 @@ static PHYSFS_sint64 zip_find_end_of_central_dir(PHYSFS_Io *io, PHYSFS_sint64 *l
             totalread += maxread;
         } /* else */
 
-        memcpy(&extra, buf, sizeof (extra));
+        memcpy(extra, buf, sizeof (extra));
 
         for (i = maxread - 4; i > 0; i--)
         {
@@ -833,7 +838,10 @@ static int zip_parse_local(PHYSFS_Io *io, ZIPentry *entry)
     BAIL_IF_ERRPASS(!readui32(io, &ui32), 0);
     BAIL_IF(ui32 != ZIP_LOCAL_FILE_SIG, PHYSFS_ERR_CORRUPT, 0);
     BAIL_IF_ERRPASS(!readui16(io, &ui16), 0);
-    BAIL_IF(ui16 != entry->version_needed, PHYSFS_ERR_CORRUPT, 0);
+    /* Windows Explorer might rewrite the entire central directory, setting
+       this field to 2.0/MS-DOS for all files, so favor the local version,
+       which it leaves intact if it didn't alter that specific file. */
+    entry->version_needed = ui16;
     BAIL_IF_ERRPASS(!readui16(io, &ui16), 0);  /* general bits. */
     BAIL_IF_ERRPASS(!readui16(io, &ui16), 0);
     BAIL_IF(ui16 != entry->compression_method, PHYSFS_ERR_CORRUPT, 0);
@@ -1482,7 +1490,7 @@ static void *ZIP_openArchive(PHYSFS_Io *io, const char *name,
 
     if (!zip_parse_end_of_central_dir(info, &dstart, &cdir_ofs, &count))
         goto ZIP_openarchive_failed;
-    else if (!__PHYSFS_DirTreeInit(&info->tree, sizeof (ZIPentry)))
+    else if (!__PHYSFS_DirTreeInit(&info->tree, sizeof (ZIPentry), 1, 0))
         goto ZIP_openarchive_failed;
 
     root = (ZIPentry *) info->tree.root;
diff --git a/src/libraries/physfs/physfs_internal.h b/src/libraries/physfs/physfs_internal.h
index 29126234a..2200d4d52 100644
--- a/src/libraries/physfs/physfs_internal.h
+++ b/src/libraries/physfs/physfs_internal.h
@@ -38,7 +38,7 @@
 #include <malloc.h>
 #endif
 
-#ifdef PHYSFS_PLATFORM_SOLARIS
+#if defined(PHYSFS_PLATFORM_SOLARIS) || defined(PHYSFS_PLATFORM_LINUX)
 #include <alloca.h>
 #endif
 
@@ -69,7 +69,7 @@ extern "C" {
    All file-private symbols need to be marked "static".
    Everything shared between PhysicsFS sources needs to be in this
    file between the visibility pragma blocks. */
-#if PHYSFS_MINIMUM_GCC_VERSION(4,0) || defined(__clang__)
+#if !defined(_WIN32) && (PHYSFS_MINIMUM_GCC_VERSION(4,0) || defined(__clang__))
 #define PHYSFS_HAVE_PRAGMA_VISIBILITY 1
 #endif
 
@@ -95,6 +95,7 @@ extern const PHYSFS_Archiver __PHYSFS_Archiver_VDF;
 /* a real C99-compliant snprintf() is in Visual Studio 2015,
    but just use this everywhere for binary compatibility. */
 #if defined(_MSC_VER)
+#include <stdarg.h>
 int __PHYSFS_msvc_vsnprintf(char *outBuf, size_t size, const char *format, va_list ap);
 int __PHYSFS_msvc_snprintf(char *outBuf, size_t size, const char *format, ...);
 #define vsnprintf __PHYSFS_msvc_vsnprintf
@@ -108,14 +109,24 @@ const void *__PHYSFS_winrtCalcPrefDir(void);
 #endif
 
 /* atomic operations. */
+/* increment/decrement operations return the final incremented/decremented value. */
 #if defined(_MSC_VER) && (_MSC_VER >= 1500)
 #include <intrin.h>
 __PHYSFS_COMPILE_TIME_ASSERT(LongEqualsInt, sizeof (int) == sizeof (long));
 #define __PHYSFS_ATOMIC_INCR(ptrval) _InterlockedIncrement((long*)(ptrval))
 #define __PHYSFS_ATOMIC_DECR(ptrval) _InterlockedDecrement((long*)(ptrval))
 #elif defined(__clang__) || (defined(__GNUC__) && (((__GNUC__ * 10000) + (__GNUC_MINOR__ * 100)) >= 40100))
-#define __PHYSFS_ATOMIC_INCR(ptrval) __sync_fetch_and_add(ptrval, 1)
-#define __PHYSFS_ATOMIC_DECR(ptrval) __sync_fetch_and_add(ptrval, -1)
+#define __PHYSFS_ATOMIC_INCR(ptrval) __sync_add_and_fetch(ptrval, 1)
+#define __PHYSFS_ATOMIC_DECR(ptrval) __sync_add_and_fetch(ptrval, -1)
+#elif defined(__WATCOMC__) && defined(__386__)
+extern __inline int _xadd_watcom(volatile int *a, int v);
+#pragma aux _xadd_watcom = \
+  "lock xadd [ecx], eax" \
+  parm [ecx] [eax] \
+  value [eax] \
+  modify exact [eax];
+#define __PHYSFS_ATOMIC_INCR(ptrval) (_xadd_watcom(ptrval, 1)+1)
+#define __PHYSFS_ATOMIC_DECR(ptrval) (_xadd_watcom(ptrval, -1)-1)
 #else
 #define PHYSFS_NEED_ATOMIC_OP_FALLBACK 1
 int __PHYSFS_ATOMIC_INCR(int *ptrval);
@@ -213,6 +224,7 @@ extern void SZIP_global_init(void);
 /* The latest supported PHYSFS_Archiver::version value. */
 #define CURRENT_PHYSFS_ARCHIVER_API_VERSION 0
 
+
 /* This byteorder stuff was lifted from SDL. https://www.libsdl.org/ */
 #define PHYSFS_LIL_ENDIAN  1234
 #define PHYSFS_BIG_ENDIAN  4321
@@ -220,11 +232,26 @@ extern void SZIP_global_init(void);
 #ifdef __linux__
 #include <endian.h>
 #define PHYSFS_BYTEORDER  __BYTE_ORDER
-#else /* __linux__ */
+#elif defined(__OpenBSD__) || defined(__DragonFly__)
+#include <endian.h>
+#define PHYSFS_BYTEORDER  BYTE_ORDER
+#elif defined(__FreeBSD__) || defined(__NetBSD__)
+#include <sys/endian.h>
+#define PHYSFS_BYTEORDER  BYTE_ORDER
+/* predefs from newer gcc and clang versions: */
+#elif defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__) && defined(__BYTE_ORDER__)
+#if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+#define PHYSFS_BYTEORDER   PHYSFS_LIL_ENDIAN
+#elif (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
+#define PHYSFS_BYTEORDER   PHYSFS_BIG_ENDIAN
+#else
+#error Unsupported endianness
+#endif /**/
+#else
 #if defined(__hppa__) || \
     defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
-    (defined(__MIPS__) && defined(__MISPEB__)) || \
-    defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
+    (defined(__MIPS__) && defined(__MIPSEB__)) || \
+    defined(__ppc__) || defined(__POWERPC__) || defined(__powerpc__) || defined(__PPC__) || \
     defined(__sparc__)
 #define PHYSFS_BYTEORDER   PHYSFS_BIG_ENDIAN
 #else
@@ -312,7 +339,18 @@ char *__PHYSFS_strdup(const char *str);
 /*
  * Give a hash value for a C string (uses djb's xor hashing algorithm).
  */
-PHYSFS_uint32 __PHYSFS_hashString(const char *str, size_t len);
+PHYSFS_uint32 __PHYSFS_hashString(const char *str);
+
+/*
+ * Give a hash value for a C string (uses djb's xor hashing algorithm), case folding as it goes.
+ */
+PHYSFS_uint32 __PHYSFS_hashStringCaseFold(const char *str);
+
+/*
+ * Give a hash value for a C string (uses djb's xor hashing algorithm), case folding as it goes,
+ *  assuming that this is only US-ASCII chars (one byte per char, only 'A' through 'Z' need folding).
+ */
+PHYSFS_uint32 __PHYSFS_hashStringCaseFoldUSAscii(const char *str);
 
 
 /*
@@ -348,9 +386,10 @@ int __PHYSFS_readAll(PHYSFS_Io *io, void *buf, const size_t len);
 
 /* These are shared between some archivers. */
 
+/* LOTS of legacy formats that only use US ASCII, not actually UTF-8, so let them optimize here. */
+void *UNPK_openArchive(PHYSFS_Io *io, const int case_sensitive, const int only_usascii);
 void UNPK_abandonArchive(void *opaque);
 void UNPK_closeArchive(void *opaque);
-void *UNPK_openArchive(PHYSFS_Io *io);
 void *UNPK_addEntry(void *opaque, char *name, const int isdir,
                     const PHYSFS_sint64 ctime, const PHYSFS_sint64 mtime,
                     const PHYSFS_uint64 pos, const PHYSFS_uint64 len);
@@ -382,10 +421,13 @@ typedef struct __PHYSFS_DirTree
     __PHYSFS_DirTreeEntry **hash;  /* all entries hashed for fast lookup. */
     size_t hashBuckets;            /* number of buckets in hash.          */
     size_t entrylen;    /* size in bytes of entries (including subclass). */
+    int case_sensitive;  /* non-zero to treat entries as case-sensitive in DirTreeFind */
+    int only_usascii;  /* non-zero to treat paths as US ASCII only (one byte per char, only 'A' through 'Z' are considered for case folding). */
 } __PHYSFS_DirTree;
 
 
-int __PHYSFS_DirTreeInit(__PHYSFS_DirTree *dt, const size_t entrylen);
+/* LOTS of legacy formats that only use US ASCII, not actually UTF-8, so let them optimize here. */
+int __PHYSFS_DirTreeInit(__PHYSFS_DirTree *dt, const size_t entrylen, const int case_sensitive, const int only_usascii);
 void *__PHYSFS_DirTreeAdd(__PHYSFS_DirTree *dt, char *name, const int isdir);
 void *__PHYSFS_DirTreeFind(__PHYSFS_DirTree *dt, const char *path);
 PHYSFS_EnumerateCallbackResult __PHYSFS_DirTreeEnumerate(void *opaque,
@@ -715,6 +757,11 @@ int __PHYSFS_platformGrabMutex(void *mutex);
  */
 void __PHYSFS_platformReleaseMutex(void *mutex);
 
+
+/* !!! FIXME: move to public API? */
+PHYSFS_uint32 __PHYSFS_utf8codepoint(const char **_str);
+
+
 #if PHYSFS_HAVE_PRAGMA_VISIBILITY
 #pragma GCC visibility pop
 #endif
diff --git a/src/libraries/physfs/physfs_lzmasdk.h b/src/libraries/physfs/physfs_lzmasdk.h
index c86972e57..d2bbcc652 100644
--- a/src/libraries/physfs/physfs_lzmasdk.h
+++ b/src/libraries/physfs/physfs_lzmasdk.h
@@ -506,6 +506,7 @@ MY_CPU_LE_UNALIGN means that CPU is LITTLE ENDIAN and CPU supports unaligned mem
 #endif
 
 #if defined(MY_CPU_AMD64) \
+    || defined(_M_ARM64) \
     || defined(_M_IA64) \
     || defined(__AARCH64EL__) \
     || defined(__AARCH64EB__)
@@ -531,6 +532,8 @@ MY_CPU_LE_UNALIGN means that CPU is LITTLE ENDIAN and CPU supports unaligned mem
 
 #if defined(_WIN32) && defined(_M_ARM)
 #define MY_CPU_ARM_LE
+#elif defined(_WIN64) && defined(_M_ARM64)
+#define MY_CPU_ARM_LE
 #endif
 
 #if defined(_WIN32) && defined(_M_IA64)
diff --git a/src/libraries/physfs/physfs_miniz.h b/src/libraries/physfs/physfs_miniz.h
index 489c52d60..e0fddb023 100644
--- a/src/libraries/physfs/physfs_miniz.h
+++ b/src/libraries/physfs/physfs_miniz.h
@@ -22,12 +22,14 @@ typedef unsigned long mz_ulong;
 typedef void *(*mz_alloc_func)(void *opaque, unsigned int items, unsigned int size);
 typedef void (*mz_free_func)(void *opaque, void *address);
 
+#ifndef MINIZ_LITTLE_ENDIAN /* if not defined by PHYSFS */
 #if defined(_M_IX86) || defined(_M_X64)
 /* Set MINIZ_USE_UNALIGNED_LOADS_AND_STORES to 1 if integer loads and stores to unaligned addresses are acceptable on the target platform (slightly faster). */
 #define MINIZ_USE_UNALIGNED_LOADS_AND_STORES 1
 /* Set MINIZ_LITTLE_ENDIAN to 1 if the processor is little endian. */
 #define MINIZ_LITTLE_ENDIAN 1
 #endif
+#endif /**/
 
 #if defined(_WIN64) || defined(__MINGW64__) || defined(_LP64) || defined(__LP64__)
 /* Set MINIZ_HAS_64BIT_REGISTERS to 1 if the processor has 64-bit general purpose registers (enables 64-bit bitbuffer in inflator) */
@@ -117,6 +119,8 @@ struct tinfl_decompressor_tag
 #define MZ_MAX(a,b) (((a)>(b))?(a):(b))
 #define MZ_MIN(a,b) (((a)<(b))?(a):(b))
 #define MZ_CLEAR_OBJ(obj) memset(&(obj), 0, sizeof(obj))
+#define MZ_CLEAR_ARR(obj) memset((obj), 0, sizeof(obj))
+#define MZ_CLEAR_PTR(obj) memset((obj), 0, sizeof(*obj))
 
 #if MINIZ_USE_UNALIGNED_LOADS_AND_STORES && MINIZ_LITTLE_ENDIAN
   #define MZ_READ_LE16(p) *((const mz_uint16 *)(p))
@@ -166,13 +170,17 @@ struct tinfl_decompressor_tag
     if (temp >= 0) { \
       code_len = temp >> 9; \
       if ((code_len) && (num_bits >= code_len)) \
-      break; \
+          break; \
     } else if (num_bits > TINFL_FAST_LOOKUP_BITS) { \
        code_len = TINFL_FAST_LOOKUP_BITS; \
        do { \
           temp = (pHuff)->m_tree[~temp + ((bit_buf >> code_len++) & 1)]; \
-       } while ((temp < 0) && (num_bits >= (code_len + 1))); if (temp >= 0) break; \
-    } TINFL_GET_BYTE(state_index, c); bit_buf |= (((tinfl_bit_buf_t)c) << num_bits); num_bits += 8; \
+       } while ((temp < 0) && (num_bits >= (code_len + 1))); \
+       if (temp >= 0) break; \
+    } \
+    TINFL_GET_BYTE(state_index, c); \
+    bit_buf |= (((tinfl_bit_buf_t)c) << num_bits); \
+    num_bits += 8; \
   } while (num_bits < 15);
 
 /* TINFL_HUFF_DECODE() decodes the next Huffman coded symbol. It's more complex than you would initially expect because the zlib API expects the decompressor to never read */
@@ -274,13 +282,13 @@ static tinfl_status tinfl_decompress(tinfl_decompressor *r, const mz_uint8 *pIn_
       else
       {
         for (counter = 0; counter < 3; counter++) { TINFL_GET_BITS(11, r->m_table_sizes[counter], "\05\05\04"[counter]); r->m_table_sizes[counter] += s_min_table_sizes[counter]; }
-        MZ_CLEAR_OBJ(r->m_tables[2].m_code_size); for (counter = 0; counter < r->m_table_sizes[2]; counter++) { mz_uint s; TINFL_GET_BITS(14, s, 3); r->m_tables[2].m_code_size[s_length_dezigzag[counter]] = (mz_uint8)s; }
+        MZ_CLEAR_ARR(r->m_tables[2].m_code_size); for (counter = 0; counter < r->m_table_sizes[2]; counter++) { mz_uint s; TINFL_GET_BITS(14, s, 3); r->m_tables[2].m_code_size[s_length_dezigzag[counter]] = (mz_uint8)s; }
         r->m_table_sizes[2] = 19;
       }
       for ( ; (int)r->m_type >= 0; r->m_type--)
       {
         int tree_next, tree_cur; tinfl_huff_table *pTable;
-        mz_uint i, j, used_syms, total, sym_index, next_code[17], total_syms[16]; pTable = &r->m_tables[r->m_type]; MZ_CLEAR_OBJ(total_syms); MZ_CLEAR_OBJ(pTable->m_look_up); MZ_CLEAR_OBJ(pTable->m_tree);
+        mz_uint i, j, used_syms, total, sym_index, next_code[17], total_syms[16]; pTable = &r->m_tables[r->m_type]; MZ_CLEAR_ARR(total_syms); MZ_CLEAR_ARR(pTable->m_look_up); MZ_CLEAR_ARR(pTable->m_tree);
         for (i = 0; i < r->m_table_sizes[r->m_type]; ++i) total_syms[pTable->m_code_size[i]]++;
         used_syms = 0, total = 0; next_code[0] = next_code[1] = 0;
         for (i = 1; i <= 15; ++i) { used_syms += total_syms[i]; next_code[i + 1] = (total = ((total + total_syms[i]) << 1)); }
diff --git a/src/libraries/physfs/physfs_platform_android.c b/src/libraries/physfs/physfs_platform_android.c
new file mode 100644
index 000000000..f892feda4
--- /dev/null
+++ b/src/libraries/physfs/physfs_platform_android.c
@@ -0,0 +1,117 @@
+/*
+ * Android support routines for PhysicsFS.
+ *
+ * Please see the file LICENSE.txt in the source's root directory.
+ *
+ *  This file written by Ryan C. Gordon.
+ */
+
+#define __PHYSICSFS_INTERNAL__
+#include "physfs_platforms.h"
+
+#ifdef PHYSFS_PLATFORM_ANDROID
+
+#include <jni.h>
+#include <android/log.h>
+#include "physfs_internal.h"
+
+static char *prefpath = NULL;
+
+
+int __PHYSFS_platformInit(void)
+{
+    return 1;  /* always succeed. */
+} /* __PHYSFS_platformInit */
+
+
+void __PHYSFS_platformDeinit(void)
+{
+    if (prefpath)
+    {
+        allocator.Free(prefpath);
+        prefpath = NULL;
+    } /* if */
+} /* __PHYSFS_platformDeinit */
+
+
+void __PHYSFS_platformDetectAvailableCDs(PHYSFS_StringCallback cb, void *data)
+{
+    /* no-op. */
+} /* __PHYSFS_platformDetectAvailableCDs */
+
+
+char *__PHYSFS_platformCalcBaseDir(const char *argv0)
+{
+    /* as a cheat, we expect argv0 to be a PHYSFS_AndroidInit* on Android. */
+    PHYSFS_AndroidInit *ainit = (PHYSFS_AndroidInit *) argv0;
+    char *retval = NULL;
+    JNIEnv *jenv = NULL;
+    jobject jcontext;
+
+    if (ainit == NULL)
+        return __PHYSFS_strdup("/");  /* oh well. */
+
+    jenv = (JNIEnv *) ainit->jnienv;
+    jcontext = (jobject) ainit->context;
+
+    if ((*jenv)->PushLocalFrame(jenv, 16) >= 0)
+    {
+        jobject jfileobj = 0;
+        jmethodID jmeth = 0;
+        jthrowable jexception = 0;
+        jstring jstr = 0;
+
+        jmeth = (*jenv)->GetMethodID(jenv, (*jenv)->GetObjectClass(jenv, jcontext), "getPackageResourcePath", "()Ljava/lang/String;");
+        jstr = (jstring)(*jenv)->CallObjectMethod(jenv, jcontext, jmeth);
+        jexception = (*jenv)->ExceptionOccurred(jenv);  /* this can't throw an exception, right? Just in case. */
+        if (jexception != NULL)
+            (*jenv)->ExceptionClear(jenv);
+        else
+        {
+            const char *path = (*jenv)->GetStringUTFChars(jenv, jstr, NULL);
+            retval = __PHYSFS_strdup(path);
+            (*jenv)->ReleaseStringUTFChars(jenv, jstr, path);
+        } /* else */
+
+        /* We only can rely on the Activity being valid during this function call,
+           so go ahead and grab the prefpath too. */
+        jmeth = (*jenv)->GetMethodID(jenv, (*jenv)->GetObjectClass(jenv, jcontext), "getFilesDir", "()Ljava/io/File;");
+        jfileobj = (*jenv)->CallObjectMethod(jenv, jcontext, jmeth);
+        if (jfileobj)
+        {
+            jmeth = (*jenv)->GetMethodID(jenv, (*jenv)->GetObjectClass(jenv, jfileobj), "getCanonicalPath", "()Ljava/lang/String;");
+            jstr = (jstring)(*jenv)->CallObjectMethod(jenv, jfileobj, jmeth);
+            jexception = (*jenv)->ExceptionOccurred(jenv);
+            if (jexception != NULL)
+                (*jenv)->ExceptionClear(jenv);
+            else
+            {
+                const char *path = (*jenv)->GetStringUTFChars(jenv, jstr, NULL);
+                const size_t len = strlen(path) + 2;
+                prefpath = allocator.Malloc(len);
+                if (prefpath)
+                    snprintf(prefpath, len, "%s/", path);
+                (*jenv)->ReleaseStringUTFChars(jenv, jstr, path);
+            } /* else */
+        } /* if */
+
+        (*jenv)->PopLocalFrame(jenv, NULL);
+    } /* if */
+
+    /* we can't return NULL because then PhysicsFS will treat argv0 as a string, but it's a non-NULL jobject! */
+    if (retval == NULL)
+        retval = __PHYSFS_strdup("/");   /* we pray this works. */
+
+    return retval;
+} /* __PHYSFS_platformCalcBaseDir */
+
+
+char *__PHYSFS_platformCalcPrefDir(const char *org, const char *app)
+{
+    return __PHYSFS_strdup(prefpath ? prefpath : "/");
+} /* __PHYSFS_platformCalcPrefDir */
+
+#endif /* PHYSFS_PLATFORM_ANDROID */
+
+/* end of physfs_platform_android.c ... */
+
diff --git a/src/libraries/physfs/physfs_platform_apple.m b/src/libraries/physfs/physfs_platform_apple.m
index e6207f5b7..f98f10d75 100644
--- a/src/libraries/physfs/physfs_platform_apple.m
+++ b/src/libraries/physfs/physfs_platform_apple.m
@@ -12,6 +12,7 @@
 #ifdef PHYSFS_PLATFORM_APPLE
 
 #include <Foundation/Foundation.h>
+#include <dlfcn.h>
 
 #include "physfs_internal.h"
 
@@ -99,7 +100,7 @@ static int darwinIsWholeMedia(io_service_t service)
 } /* darwinIsWholeMedia */
 
 
-static int darwinIsMountedDisc(char *bsdName, mach_port_t masterPort)
+static int darwinIsMountedDisc(char *bsdName, mach_port_t mainPort)
 {
     int retval = 0;
     CFMutableDictionaryRef matchingDict;
@@ -107,10 +108,10 @@ static int darwinIsMountedDisc(char *bsdName, mach_port_t masterPort)
     io_iterator_t iter;
     io_service_t service;
 
-    if ((matchingDict = IOBSDNameMatching(masterPort, 0, bsdName)) == NULL)
+    if ((matchingDict = IOBSDNameMatching(mainPort, 0, bsdName)) == NULL)
         return 0;
 
-    rc = IOServiceGetMatchingServices(masterPort, matchingDict, &iter);
+    rc = IOServiceGetMatchingServices(mainPort, matchingDict, &iter);
     if ((rc != KERN_SUCCESS) || (!iter))
         return 0;
 
@@ -158,13 +159,25 @@ static int darwinIsMountedDisc(char *bsdName, mach_port_t masterPort)
 void __PHYSFS_platformDetectAvailableCDs(PHYSFS_StringCallback cb, void *data)
 {
 #if !defined(PHYSFS_NO_CDROM_SUPPORT)
+    /* macOS 12.0 changed "master" names to "main". */
+    typedef kern_return_t (*ioMainPortFn)(mach_port_t, mach_port_t *);
+    static ioMainPortFn ioMainPort = NULL;
     const char *devPrefix = "/dev/";
     const int prefixLen = strlen(devPrefix);
-    mach_port_t masterPort = 0;
+    mach_port_t mainPort = 0;
     struct statfs *mntbufp;
     int i, mounts;
 
-    if (IOMasterPort(MACH_PORT_NULL, &masterPort) != KERN_SUCCESS)
+    if (ioMainPort == NULL)
+    {
+        ioMainPort = (ioMainPortFn) dlsym(RTLD_DEFAULT, "IOMainPort");
+        if (!ioMainPort)
+            ioMainPort = (ioMainPortFn) dlsym(RTLD_DEFAULT, "IOMasterPort");
+        if (!ioMainPort)
+            return; /* oh well, no CD-ROMs for you. */
+    } /* if */
+
+    if (ioMainPort(MACH_PORT_NULL, &mainPort) != KERN_SUCCESS)
         BAIL(PHYSFS_ERR_OS_ERROR, ) /*return void*/;
 
     mounts = getmntinfo(&mntbufp, MNT_WAIT);  /* NOT THREAD SAFE! */
@@ -176,7 +189,7 @@ void __PHYSFS_platformDetectAvailableCDs(PHYSFS_StringCallback cb, void *data)
             continue;
 
         dev += prefixLen;
-        if (darwinIsMountedDisc(dev, masterPort))
+        if (darwinIsMountedDisc(dev, mainPort))
             cb(data, mnt);
     } /* for */
 #endif /* !defined(PHYSFS_NO_CDROM_SUPPORT) */
diff --git a/src/libraries/physfs/physfs_platform_os2.c b/src/libraries/physfs/physfs_platform_os2.c
index 8cc8044cf..bf47a9dcf 100644
--- a/src/libraries/physfs/physfs_platform_os2.c
+++ b/src/libraries/physfs/physfs_platform_os2.c
@@ -222,7 +222,7 @@ static char *cvtPathToCorrectCase(char *buf)
         if (ptr != NULL)  /* isolate element to find (fname is the start). */
             *ptr = '\0';
 
-        rc = DosFindFirst((unsigned char *) spec, &hdir, FILE_DIRECTORY,
+        rc = DosFindFirst(spec, &hdir, FILE_DIRECTORY,
                           &fb, sizeof (fb), &count, FIL_STANDARD);
         if (rc == NO_ERROR)
         {
@@ -331,7 +331,7 @@ static int isCdRomDrive(ULONG drive)
     ULONG ul1, ul2;
     APIRET rc;
     HFILE hfile = NULLHANDLE;
-    unsigned char drivename[3] = { 0, ':', '\0' };
+    char drivename[3] = { 0, ':', '\0' };
 
     drivename[0] = 'A' + drive;
 
@@ -443,7 +443,7 @@ PHYSFS_EnumerateCallbackResult __PHYSFS_platformEnumerate(const char *dirname,
     __PHYSFS_smallFree(utf8);
     BAIL_IF_ERRPASS(!cpspec, PHYSFS_ENUM_ERROR);
 
-    rc = DosFindFirst((unsigned char *) cpspec, &hdir,
+    rc = DosFindFirst(cpspec, &hdir,
                       FILE_DIRECTORY | FILE_ARCHIVED |
                       FILE_READONLY | FILE_HIDDEN | FILE_SYSTEM,
                       &fb, sizeof (fb), &count, FIL_STANDARD);
@@ -535,7 +535,7 @@ int __PHYSFS_platformMkDir(const char *filename)
     APIRET rc;
     char *cpstr = cvtUtf8ToCodepage(filename);
     BAIL_IF_ERRPASS(!cpstr, 0);
-    rc = DosCreateDir((unsigned char *) cpstr, NULL);
+    rc = DosCreateDir(cpstr, NULL);
     allocator.Free(cpstr);
     BAIL_IF(rc != NO_ERROR, errcodeFromAPIRET(rc), 0);
     return 1;
diff --git a/src/libraries/physfs/physfs_platform_posix.c b/src/libraries/physfs/physfs_platform_posix.c
index fa2159cd8..7ba5e1070 100644
--- a/src/libraries/physfs/physfs_platform_posix.c
+++ b/src/libraries/physfs/physfs_platform_posix.c
@@ -6,8 +6,6 @@
  *  This file written by Ryan C. Gordon.
  */
 
-/* !!! FIXME: check for EINTR? */
-
 #define __PHYSICSFS_INTERNAL__
 #include "physfs_platforms.h"
 
@@ -157,19 +155,41 @@ int __PHYSFS_platformMkDir(const char *path)
 } /* __PHYSFS_platformMkDir */
 
 
+#if !defined(O_CLOEXEC) && defined(FD_CLOEXEC)
+static inline void set_CLOEXEC(int fildes)
+{
+    int flags = fcntl(fildes, F_GETFD);
+    if (flags != -1) {
+        fcntl(fildes, F_SETFD, flags | FD_CLOEXEC);
+    }
+}
+#endif
+
 static void *doOpen(const char *filename, int mode)
 {
     const int appending = (mode & O_APPEND);
     int fd;
     int *retval;
+
     errno = 0;
 
     /* O_APPEND doesn't actually behave as we'd like. */
     mode &= ~O_APPEND;
 
-    fd = open(filename, mode, S_IRUSR | S_IWUSR);
+#ifdef O_CLOEXEC
+    /* Add O_CLOEXEC if defined */
+    mode |= O_CLOEXEC;
+#endif
+
+    do {
+        fd = open(filename, mode, S_IRUSR | S_IWUSR);
+    } while ((fd < 0) && (errno == EINTR));
     BAIL_IF(fd < 0, errcodeFromErrno(), NULL);
 
+#if !defined(O_CLOEXEC) && defined(FD_CLOEXEC)
+    set_CLOEXEC(fd);
+#endif
+
     if (appending)
     {
         if (lseek(fd, 0, SEEK_END) < 0)
@@ -219,7 +239,9 @@ PHYSFS_sint64 __PHYSFS_platformRead(void *opaque, void *buffer,
     if (!__PHYSFS_ui64FitsAddressSpace(len))
         BAIL(PHYSFS_ERR_INVALID_ARGUMENT, -1);
 
-    rc = read(fd, buffer, (size_t) len);
+    do {
+        rc = read(fd, buffer, (size_t) len);
+    } while ((rc == -1) && (errno == EINTR));
     BAIL_IF(rc == -1, errcodeFromErrno(), -1);
     assert(rc >= 0);
     assert(rc <= len);
@@ -236,7 +258,9 @@ PHYSFS_sint64 __PHYSFS_platformWrite(void *opaque, const void *buffer,
     if (!__PHYSFS_ui64FitsAddressSpace(len))
         BAIL(PHYSFS_ERR_INVALID_ARGUMENT, -1);
 
-    rc = write(fd, (void *) buffer, (size_t) len);
+    do {
+        rc = write(fd, (void *) buffer, (size_t) len);
+    } while ((rc == -1) && (errno == EINTR));
     BAIL_IF(rc == -1, errcodeFromErrno(), rc);
     assert(rc >= 0);
     assert(rc <= len);
@@ -275,8 +299,13 @@ PHYSFS_sint64 __PHYSFS_platformFileLength(void *opaque)
 int __PHYSFS_platformFlush(void *opaque)
 {
     const int fd = *((int *) opaque);
-    if ((fcntl(fd, F_GETFL) & O_ACCMODE) != O_RDONLY)
-        BAIL_IF(fsync(fd) == -1, errcodeFromErrno(), 0);
+    int rc = -1;
+    if ((fcntl(fd, F_GETFL) & O_ACCMODE) != O_RDONLY) {
+        do {
+            rc = fsync(fd);
+        } while ((rc == -1) && (errno == EINTR));
+        BAIL_IF(rc == -1, errcodeFromErrno(), 0);
+    }
     return 1;
 } /* __PHYSFS_platformFlush */
 
@@ -284,7 +313,10 @@ int __PHYSFS_platformFlush(void *opaque)
 void __PHYSFS_platformClose(void *opaque)
 {
     const int fd = *((int *) opaque);
-    (void) close(fd);  /* we don't check this. You should have used flush! */
+    int rc = -1;
+    do {
+        rc = close(fd);  /* we don't check this. You should have used flush! */
+    } while ((rc == -1) && (errno == EINTR));
     allocator.Free(opaque);
 } /* __PHYSFS_platformClose */
 
diff --git a/src/libraries/physfs/physfs_platform_unix.c b/src/libraries/physfs/physfs_platform_unix.c
index 10d93a7e5..b945e03fd 100644
--- a/src/libraries/physfs/physfs_platform_unix.c
+++ b/src/libraries/physfs/physfs_platform_unix.c
@@ -261,12 +261,6 @@ char *__PHYSFS_platformCalcBaseDir(const char *argv0)
         if (sysctl(mib, 4, fullpath, &buflen, NULL, 0) != -1)
             retval = __PHYSFS_strdup(fullpath);
     }
-    #elif defined(PHYSFS_PLATFORM_SOLARIS)
-    {
-        const char *path = getexecname();
-        if ((path != NULL) && (path[0] == '/'))  /* must be absolute path... */
-            retval = __PHYSFS_strdup(path);
-    }
     #endif
 
     /* If there's a Linux-like /proc filesystem, you can get the full path to
@@ -278,6 +272,7 @@ char *__PHYSFS_platformCalcBaseDir(const char *argv0)
         retval = readSymLink("/proc/self/exe");
         if (!retval) retval = readSymLink("/proc/curproc/file");
         if (!retval) retval = readSymLink("/proc/curproc/exe");
+        if (!retval) retval = readSymLink("/proc/self/path/a.out");
         if (retval == NULL)
         {
             /* older kernels don't have /proc/self ... try PID version... */
@@ -289,6 +284,15 @@ char *__PHYSFS_platformCalcBaseDir(const char *argv0)
         } /* if */
     } /* if */
 
+    #if defined(PHYSFS_PLATFORM_SOLARIS)
+    if (!retval)  /* try getexecname() if /proc didn't pan out. This may not be an absolute path! */
+    {
+        const char *path = getexecname();
+        if ((path != NULL) && (path[0] == '/'))  /* must be absolute path... */
+            retval = __PHYSFS_strdup(path);
+    } /* if */
+    #endif
+
     if (retval != NULL)  /* chop off filename. */
     {
         char *ptr = strrchr(retval, '/');
diff --git a/src/libraries/physfs/physfs_platform_windows.c b/src/libraries/physfs/physfs_platform_windows.c
index c92e98d07..652300c9a 100644
--- a/src/libraries/physfs/physfs_platform_windows.c
+++ b/src/libraries/physfs/physfs_platform_windows.c
@@ -101,7 +101,7 @@ static char *unicodeToUtf8Heap(const WCHAR *w_str)
 
 static inline HANDLE winFindFirstFileW(const WCHAR *path, LPWIN32_FIND_DATAW d)
 {
-    #ifdef PHYSFS_PLATFORM_WINRT
+    #if defined(PHYSFS_PLATFORM_WINRT) || (_WIN32_WINNT >= 0x0501) // Windows XP+
     return FindFirstFileExW(path, FindExInfoStandard, d,
                             FindExSearchNameMatch, NULL, 0);
     #else
@@ -111,7 +111,7 @@ static inline HANDLE winFindFirstFileW(const WCHAR *path, LPWIN32_FIND_DATAW d)
 
 static inline BOOL winInitializeCriticalSection(LPCRITICAL_SECTION lpcs)
 {
-    #ifdef PHYSFS_PLATFORM_WINRT
+    #if defined(PHYSFS_PLATFORM_WINRT) || (_WIN32_WINNT >= 0x0600) // Windows Vista+
     return InitializeCriticalSectionEx(lpcs, 2000, 0);
     #else
     InitializeCriticalSection(lpcs);
@@ -123,7 +123,7 @@ static inline HANDLE winCreateFileW(const WCHAR *wfname, const DWORD mode,
                                     const DWORD creation)
 {
     const DWORD share = FILE_SHARE_READ | FILE_SHARE_WRITE;
-    #ifdef PHYSFS_PLATFORM_WINRT
+    #if defined(PHYSFS_PLATFORM_WINRT) || (_WIN32_WINNT >= 0x0602) // Windows 8+
     return CreateFile2(wfname, mode, share, creation, NULL);
     #else
     return CreateFileW(wfname, mode, share, NULL, creation,
@@ -134,7 +134,7 @@ static inline HANDLE winCreateFileW(const WCHAR *wfname, const DWORD mode,
 static BOOL winSetFilePointer(HANDLE h, const PHYSFS_sint64 pos,
                               PHYSFS_sint64 *_newpos, const DWORD whence)
 {
-    #ifdef PHYSFS_PLATFORM_WINRT
+    #if defined(PHYSFS_PLATFORM_WINRT) || (_WIN32_WINNT >= 0x0501) // Windows XP+
     LARGE_INTEGER lipos;
     LARGE_INTEGER linewpos;
     BOOL rc;
@@ -158,7 +158,7 @@ static BOOL winSetFilePointer(HANDLE h, const PHYSFS_sint64 pos,
 
 static PHYSFS_sint64 winGetFileSize(HANDLE h)
 {
-    #ifdef PHYSFS_PLATFORM_WINRT
+    #if defined(PHYSFS_PLATFORM_WINRT) || (_WIN32_WINNT >= 0x0600) // Windows Vista+
     FILE_STANDARD_INFO info;
     const BOOL rc = GetFileInformationByHandleEx(h, FileStandardInfo,
                                                  &info, sizeof (info));
diff --git a/src/libraries/physfs/physfs_platforms.h b/src/libraries/physfs/physfs_platforms.h
index d4e4bfdc3..1ac17d9c6 100644
--- a/src/libraries/physfs/physfs_platforms.h
+++ b/src/libraries/physfs/physfs_platforms.h
@@ -40,11 +40,11 @@
 #  define PHYSFS_PLATFORM_POSIX 1
 #elif defined(macintosh)
 #  error Classic Mac OS support was dropped from PhysicsFS 2.0. Move to OS X.
-#elif defined(ANDROID)
-#  define PHYSFS_PLATFORM_LINUX 1
-#  define PHYSFS_PLATFORM_UNIX 1
-#  define PHYSFS_PLATFORM_POSIX 1
-#  define PHYSFS_NO_CDROM_SUPPORT 1
+#elif defined(__ANDROID__)
+ #  define PHYSFS_PLATFORM_LINUX 1
+ #  define PHYSFS_PLATFORM_ANDROID 1
+ #  define PHYSFS_PLATFORM_POSIX 1
+ #  define PHYSFS_NO_CDROM_SUPPORT 1
 #elif defined(__linux)
 #  define PHYSFS_PLATFORM_LINUX 1
 #  define PHYSFS_PLATFORM_UNIX 1
diff --git a/src/libraries/physfs/physfs_unicode.c b/src/libraries/physfs/physfs_unicode.c
index 0e0060224..bab4f8bb7 100644
--- a/src/libraries/physfs/physfs_unicode.c
+++ b/src/libraries/physfs/physfs_unicode.c
@@ -21,8 +21,8 @@
 /*
  * This may not be the best value, but it's one that isn't represented
  *  in Unicode (0x10FFFF is the largest codepoint value). We return this
- *  value from utf8codepoint() if there's bogus bits in the
- *  stream. utf8codepoint() will turn this value into something
+ *  value from __PHYSFS_utf8codepoint() if there's bogus bits in the
+ *  stream. __PHYSFS_utf8codepoint() will turn this value into something
  *  reasonable (like a question mark), for text that wants to try to recover,
  *  whereas utf8valid() will use the value to determine if a string has bad
  *  bits.
@@ -35,7 +35,7 @@
  */
 #define UNICODE_BOGUS_CHAR_CODEPOINT '?'
 
-static PHYSFS_uint32 utf8codepoint(const char **_str)
+PHYSFS_uint32 __PHYSFS_utf8codepoint(const char **_str)
 {
     const char *str = *_str;
     PHYSFS_uint32 retval = 0;
@@ -188,6 +188,11 @@ static PHYSFS_uint32 utf8codepoint(const char **_str)
     } /* else if */
 
     return UNICODE_BOGUS_CHAR_VALUE;
+} /* __PHYSFS_utf8codepoint */
+
+static inline PHYSFS_uint32 utf8codepoint(const char **_str)
+{
+    return __PHYSFS_utf8codepoint(_str);
 } /* utf8codepoint */
 
 static PHYSFS_uint32 utf16codepoint(const PHYSFS_uint16 **_str)
@@ -210,7 +215,7 @@ static PHYSFS_uint32 utf16codepoint(const PHYSFS_uint16 **_str)
         else
         {
             src++;  /* eat the other surrogate. */
-            cp = (((cp - 0xD800) << 10) | (pair - 0xDC00));
+            cp = 0x10000 + (((cp - 0xD800) << 10) | (pair - 0xDC00));
         } /* else */
     } /* else if */
 
@@ -238,7 +243,7 @@ void PHYSFS_utf8ToUcs4(const char *src, PHYSFS_uint32 *dst, PHYSFS_uint64 len)
     len -= sizeof (PHYSFS_uint32);   /* save room for null char. */
     while (len >= sizeof (PHYSFS_uint32))
     {
-        PHYSFS_uint32 cp = utf8codepoint(&src);
+        PHYSFS_uint32 cp = __PHYSFS_utf8codepoint(&src);
         if (cp == 0)
             break;
         else if (cp == UNICODE_BOGUS_CHAR_VALUE)
@@ -256,7 +261,7 @@ void PHYSFS_utf8ToUcs2(const char *src, PHYSFS_uint16 *dst, PHYSFS_uint64 len)
     len -= sizeof (PHYSFS_uint16);   /* save room for null char. */
     while (len >= sizeof (PHYSFS_uint16))
     {
-        PHYSFS_uint32 cp = utf8codepoint(&src);
+        PHYSFS_uint32 cp = __PHYSFS_utf8codepoint(&src);
         if (cp == 0)
             break;
         else if (cp == UNICODE_BOGUS_CHAR_VALUE)
@@ -278,7 +283,7 @@ void PHYSFS_utf8ToUtf16(const char *src, PHYSFS_uint16 *dst, PHYSFS_uint64 len)
     len -= sizeof (PHYSFS_uint16);   /* save room for null char. */
     while (len >= sizeof (PHYSFS_uint16))
     {
-        PHYSFS_uint32 cp = utf8codepoint(&src);
+        PHYSFS_uint32 cp = __PHYSFS_utf8codepoint(&src);
         if (cp == 0)
             break;
         else if (cp == UNICODE_BOGUS_CHAR_VALUE)
diff --git a/src/modules/filesystem/physfs/Filesystem.cpp b/src/modules/filesystem/physfs/Filesystem.cpp
index 28e562c57..e5d7d93d3 100644
--- a/src/modules/filesystem/physfs/Filesystem.cpp
+++ b/src/modules/filesystem/physfs/Filesystem.cpp
@@ -123,6 +123,13 @@ const char *Filesystem::getName() const
 
 void Filesystem::init(const char *arg0)
 {
+#ifdef LOVE_ANDROID
+	// TODO: This should be a pointer to an initializeed PHYSFS_AndroidInit
+	// struct on android. But it's only used for PHYSFS_getBaseDir and
+	// PHYSFS_getPrefDir, which we don't use right now...
+	arg0 = nullptr;
+#endif
+
 	if (!PHYSFS_init(arg0))
 		throw love::Exception("Failed to initialize filesystem: %s", PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));