/*

 * Win32 support routines for PhysicsFS.

 *

 * Please see the file LICENSE in the source's root directory.

 *

 *  This file written by Ryan C. Gordon, and made sane by Gregory S. Read.

 */

#if HAVE_CONFIG_H

#  include <config.h>

#endif

#include <windows.h>

#include <stdio.h>

#include <stdlib.h>

#include <ctype.h>

#include <time.h>

#define __PHYSICSFS_INTERNAL__

#include "physfs_internal.h"

#define LOWORDER_UINT64(pos)       (PHYSFS_uint32)(pos & 0x00000000FFFFFFFF)

#define HIGHORDER_UINT64(pos)      (PHYSFS_uint32)(pos & 0xFFFFFFFF00000000)

const char *__PHYSFS_platformDirSeparator = "\\";

static OSVERSIONINFO OSVersionInfo;     /* Information about the OS */

static char *ProfileDirectory = NULL;   /* User profile folder */

/* Users without the platform SDK don't have this defined.  The original docs

   for SetFilePointer() just said to compare with 0xFFFFFFF, so this should

   work as desired */

#ifndef INVALID_SET_FILE_POINTER

#define INVALID_SET_FILE_POINTER 0xFFFFFFFF

#endif

/*

 *

 */

static const char *win32strerror(void)

{

    static TCHAR msgbuf[255];

    FormatMessage(

        FORMAT_MESSAGE_FROM_SYSTEM |

        FORMAT_MESSAGE_IGNORE_INSERTS,

        NULL,

        GetLastError(),

        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), /* Default language */

        msgbuf,

        sizeof (msgbuf) / sizeof (TCHAR),

        NULL 

    );

    return((const char *) msgbuf);

} /* win32strerror */

char **__PHYSFS_platformDetectAvailableCDs(void)

{

    char **retval = (char **) malloc(sizeof (char *));

    int cd_count = 1;  /* We count the NULL entry. */

    char drive_str[4] = "x:\\";

    for (drive_str[0] = 'A'; drive_str[0] <= 'Z'; drive_str[0]++)

    {

        if (GetDriveType(drive_str) == DRIVE_CDROM && MediaInDrive(drive_str))

        {

            char **tmp = realloc(retval, sizeof (char *) * cd_count + 1);

            if (tmp)

            {

                retval = tmp;

                retval[cd_count-1] = (char *) malloc(4);

                if (retval[cd_count-1])

                {

                    strcpy(retval[cd_count-1], drive_str);

                    cd_count++;

                } /* if */

            } /* if */

        } /* if */

    } /* for */

    retval[cd_count - 1] = NULL;

    return(retval);

} /* __PHYSFS_detectAvailableCDs */

static char *getExePath(const char *argv0)

{

    char *filepart = NULL;

    retval[buflen] = '\0';  /* does API always null-terminate the string? */

        /* make sure the string was not truncated. */

    if (__PHYSFS_platformStricmp(&retval[buflen - 4], ".exe") == 0)

    {

        char *ptr = strrchr(retval, '\\');

        if (ptr != NULL)

        {

            *(ptr + 1) = '\0';  /* chop off filename. */

            /* free up the bytes we didn't actually use. */            

        } /* if */

    } /* if */

    /* if any part of the previous approach failed, try SearchPath()... */

    buflen = SearchPath(NULL, argv0, NULL, buflen, NULL, NULL);

    retval = (char *) realloc(retval, buflen);

    BAIL_IF_MACRO(!retval, ERR_OUT_OF_MEMORY, NULL);

    SearchPath(NULL, argv0, NULL, buflen, retval, &filepart);

    return(retval);

} /* getExePath */

char *__PHYSFS_platformCalcBaseDir(const char *argv0)

{

    if (strchr(argv0, '\\') != NULL)   /* default behaviour can handle this. */

        return(NULL);

    return(getExePath(argv0));

} /* __PHYSFS_platformCalcBaseDir */

char *__PHYSFS_platformGetUserName(void)

{

    DWORD bufsize = 0;

    LPTSTR retval = NULL;

    if (GetUserName(NULL, &bufsize) == 0)  /* This SHOULD fail. */

    {

        retval = (LPTSTR) malloc(bufsize);

        BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);

        if (GetUserName(retval, &bufsize) == 0)  /* ?! */

        {

            free(retval);

            retval = NULL;

        } /* if */

    } /* if */

    return((char *) retval);

} /* __PHYSFS_platformGetUserName */

char *__PHYSFS_platformGetUserDir(void)

{

} /* __PHYSFS_platformGetUserDir */

PHYSFS_uint64 __PHYSFS_platformGetThreadID(void)

{

    return((PHYSFS_uint64)GetCurrentThreadId());

} /* __PHYSFS_platformGetThreadID */

/* ...make this Cygwin AND Visual C friendly... */

int __PHYSFS_platformStricmp(const char *x, const char *y)

{

#if (defined _MSC_VER)

    return(stricmp(x, y));

#else

    int ux, uy;

    do

    {

        ux = toupper((int) *x);

        uy = toupper((int) *y);

        if (ux > uy)

            return(1);

        else if (ux < uy)

            return(-1);

        x++;

        y++;

    } while ((ux) && (uy));

    return(0);

#endif

} /* __PHYSFS_platformStricmp */

int __PHYSFS_platformExists(const char *fname)

{

    return(GetFileAttributes(fname) != 0xffffffff);

} /* __PHYSFS_platformExists */

int __PHYSFS_platformIsSymLink(const char *fname)

{

    return(0);  /* no symlinks on win32. */

} /* __PHYSFS_platformIsSymlink */

int __PHYSFS_platformIsDirectory(const char *fname)

{

    return((GetFileAttributes(fname) & FILE_ATTRIBUTE_DIRECTORY) != 0);

} /* __PHYSFS_platformIsDirectory */

char *__PHYSFS_platformCvtToDependent(const char *prepend,

                                      const char *dirName,

                                      const char *append)

{

    int len = ((prepend) ? strlen(prepend) : 0) +

              ((append) ? strlen(append) : 0) +

              strlen(dirName) + 1;

    char *retval = malloc(len);

    char *p;

    BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);

    if (prepend)

        strcpy(retval, prepend);

    else

        retval[0] = '\0';

    strcat(retval, dirName);

    if (append)

        strcat(retval, append);

    for (p = strchr(retval, '/'); p != NULL; p = strchr(p + 1, '/'))

        *p = '\\';

    return(retval);

} /* __PHYSFS_platformCvtToDependent */

/* Much like my college days, try to sleep for 10 milliseconds at a time... */

void __PHYSFS_platformTimeslice(void)

{

    Sleep(10);

} /* __PHYSFS_platformTimeslice */

LinkedStringList *__PHYSFS_platformEnumerateFiles(const char *dirname,

                                                  int omitSymLinks)

{

    LinkedStringList *retval = NULL;

    LinkedStringList *l = NULL;

    LinkedStringList *prev = NULL;

    HANDLE dir;

    WIN32_FIND_DATA ent;

    char *SearchPath;

    size_t len = strlen(dirname);

    /* Allocate a new string for path, maybe '\\', "*", and NULL terminator */

    /* Copy current dirname */

    strcpy(SearchPath, dirname);

    /* if there's no '\\' at the end of the path, stick one in there. */

    {

    } /* if */

    /* Append the "*" to the end of the string */

    strcat(SearchPath, "*");

    dir = FindFirstFile(SearchPath, &ent);

    BAIL_IF_MACRO(dir == INVALID_HANDLE_VALUE, win32strerror(), NULL);

    do

    {

        if (strcmp(ent.cFileName, ".") == 0)

            continue;

        if (strcmp(ent.cFileName, "..") == 0)

            continue;

        l = (LinkedStringList *) malloc(sizeof (LinkedStringList));

        if (l == NULL)

            break;

        l->str = (char *) malloc(strlen(ent.cFileName) + 1);

        if (l->str == NULL)

        {

            free(l);

            break;

        } /* if */

        strcpy(l->str, ent.cFileName);

        if (retval == NULL)

            retval = l;

        else

            prev->next = l;

        prev = l;

        l->next = NULL;

    } while (FindNextFile(dir, &ent) != 0);

    FindClose(dir);

    return(retval);

} /* __PHYSFS_platformEnumerateFiles */

char *__PHYSFS_platformCurrentDir(void)

{

    LPTSTR retval;

    DWORD buflen = 0;

    buflen = GetCurrentDirectory(buflen, NULL);

    retval = (LPTSTR) malloc(sizeof (TCHAR) * (buflen + 2));

    BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);

    GetCurrentDirectory(buflen, retval);

    if (retval[buflen - 2] != '\\')

        strcat(retval, "\\");

    return((char *) retval);

} /* __PHYSFS_platformCurrentDir */

/* this could probably use a cleanup. */

char *__PHYSFS_platformRealPath(const char *path)

{

    char *retval = NULL;

    char *p = NULL;

    BAIL_IF_MACRO(path == NULL, ERR_INVALID_ARGUMENT, NULL);

    BAIL_IF_MACRO(*path == '\0', ERR_INVALID_ARGUMENT, NULL);

    retval = (char *) malloc(MAX_PATH);

    BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);

        /*

         * If in \\server\path format, it's already an absolute path.

         *  We'll need to check for "." and ".." dirs, though, just in case.

         */

    if ((path[0] == '\\') && (path[1] == '\\'))

        strcpy(retval, path);

    else

    {

        char *currentDir = __PHYSFS_platformCurrentDir();

        if (currentDir == NULL)

        {

            free(retval);

            BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);

        } /* if */

        if (path[1] == ':')   /* drive letter specified? */

        {

            /*

             * Apparently, "D:mypath" is the same as "D:\\mypath" if

             *  D: is not the current drive. However, if D: is the

             *  current drive, then "D:mypath" is a relative path. Ugh.

             */

            if (path[2] == '\\')  /* maybe an absolute path? */

                strcpy(retval, path);

            else  /* definitely an absolute path. */

            {

                if (path[0] == currentDir[0]) /* current drive; relative. */

                {

                    strcpy(retval, currentDir);

                    strcat(retval, path + 2);

                } /* if */

                else  /* not current drive; absolute. */