grp.c

嵌入式环境下的GUI

} /* grp_entry_cmp */


static void grp_entry_swap(void *_a, PHYSFS_uint32 one, PHYSFS_uint32 two)
{
    GRPentry tmp;
    GRPentry *first = &(((GRPentry *) _a)[one]);
    GRPentry *second = &(((GRPentry *) _a)[two]);
    memcpy(&tmp, first, sizeof (GRPentry));
    memcpy(first, second, sizeof (GRPentry));
    memcpy(second, &tmp, sizeof (GRPentry));
} /* grp_entry_swap */


static int grp_load_entries(const char *name, int forWriting, GRPinfo *info)
{
    void *fh = NULL;
    PHYSFS_uint32 fileCount;
    PHYSFS_uint32 location = 16;  /* sizeof sig. */
    GRPentry *entry;
    char *ptr;

    BAIL_IF_MACRO(!grp_open(name, forWriting, &fh, &fileCount), NULL, 0);
    info->entryCount = fileCount;
    info->entries = (GRPentry *) malloc(sizeof (GRPentry) * fileCount);
    if (info->entries == NULL)
    {
        __PHYSFS_platformClose(fh);
        BAIL_MACRO(ERR_OUT_OF_MEMORY, 0);
    } /* if */

    location += (16 * fileCount);

    for (entry = info->entries; fileCount > 0; fileCount--, entry++)
    {
        if (__PHYSFS_platformRead(fh, &entry->name, 12, 1) != 1)
        {
            __PHYSFS_platformClose(fh);
            return(0);
        } /* if */

        entry->name[12] = '\0';  /* name isn't null-terminated in file. */
        if ((ptr = strchr(entry->name, ' ')) != NULL)
            *ptr = '\0';  /* trim extra spaces. */

        if (__PHYSFS_platformRead(fh, &entry->size, 4, 1) != 1)
        {
            __PHYSFS_platformClose(fh);
            return(0);
        } /* if */

        entry->size = PHYSFS_swapULE32(entry->size);
        entry->startPos = location;
        location += entry->size;
    } /* for */

    __PHYSFS_platformClose(fh);

    __PHYSFS_sort(info->entries, info->entryCount,
                  grp_entry_cmp, grp_entry_swap);
    return(1);
} /* grp_load_entries */


static DirHandle *GRP_openArchive(const char *name, int forWriting)
{
    GRPinfo *info;
    DirHandle *retval = malloc(sizeof (DirHandle));
    PHYSFS_sint64 modtime = __PHYSFS_platformGetLastModTime(name);

    BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
    info = retval->opaque = malloc(sizeof (GRPinfo));
    if (info == NULL)
    {
        __PHYSFS_setError(ERR_OUT_OF_MEMORY);
        goto GRP_openArchive_failed;
    } /* if */

    memset(info, '\0', sizeof (GRPinfo));

    info->filename = (char *) malloc(strlen(name) + 1);
    if (info->filename == NULL)
    {
        __PHYSFS_setError(ERR_OUT_OF_MEMORY);
        goto GRP_openArchive_failed;
    } /* if */

    if (!grp_load_entries(name, forWriting, info))
        goto GRP_openArchive_failed;

    strcpy(info->filename, name);
    info->last_mod_time = modtime;
    retval->funcs = &__PHYSFS_DirFunctions_GRP;
    return(retval);

GRP_openArchive_failed:
    if (retval != NULL)
    {
        if (retval->opaque != NULL)
        {
            if (info->filename != NULL)
                free(info->filename);
            if (info->entries != NULL)
                free(info->entries);
            free(info);
        } /* if */
        free(retval);
    } /* if */

    return(NULL);
} /* GRP_openArchive */


static LinkedStringList *GRP_enumerateFiles(DirHandle *h,
                                            const char *dirname,
                                            int omitSymLinks)
{
    GRPinfo *info = ((GRPinfo *) h->opaque);
    GRPentry *entry = info->entries;
    LinkedStringList *retval = NULL, *p = NULL;
    PHYSFS_uint32 max = info->entryCount;
    PHYSFS_uint32 i;

    /* no directories in GRP files. */
    BAIL_IF_MACRO(*dirname != '\0', ERR_NOT_A_DIR, NULL);

    for (i = 0; i < max; i++, entry++)
        retval = __PHYSFS_addToLinkedStringList(retval, &p, entry->name, -1);

    return(retval);
} /* GRP_enumerateFiles */


static GRPentry *grp_find_entry(GRPinfo *info, const char *name)
{
    char *ptr = strchr(name, '.');
    GRPentry *a = info->entries;
    PHYSFS_sint32 lo = 0;
    PHYSFS_sint32 hi = (PHYSFS_sint32) (info->entryCount - 1);
    PHYSFS_sint32 middle;
    int rc;

    /*
     * Rule out filenames to avoid unneeded processing...no dirs,
     *   big filenames, or extensions > 3 chars.
     */
    BAIL_IF_MACRO((ptr) && (strlen(ptr) > 4), ERR_NO_SUCH_FILE, NULL);
    BAIL_IF_MACRO(strlen(name) > 12, ERR_NO_SUCH_FILE, NULL);
    BAIL_IF_MACRO(strchr(name, '/') != NULL, ERR_NO_SUCH_FILE, NULL);

    while (lo <= hi)
    {
        middle = lo + ((hi - lo) / 2);
        rc = strcmp(name, a[middle].name);
        if (rc == 0)  /* found it! */
            return(&a[middle]);
        else if (rc > 0)
            lo = middle + 1;
        else
            hi = middle - 1;
    } /* while */

    BAIL_MACRO(ERR_NO_SUCH_FILE, NULL);
} /* grp_find_entry */


static int GRP_exists(DirHandle *h, const char *name)
{
    return(grp_find_entry(((GRPinfo *) h->opaque), name) != NULL);
} /* GRP_exists */


static int GRP_isDirectory(DirHandle *h, const char *name, int *fileExists)
{
    *fileExists = GRP_exists(h, name);
    return(0);  /* never directories in a groupfile. */
} /* GRP_isDirectory */


static int GRP_isSymLink(DirHandle *h, const char *name, int *fileExists)
{
    *fileExists = GRP_exists(h, name);
    return(0);  /* never symlinks in a groupfile. */
} /* GRP_isSymLink */


static PHYSFS_sint64 GRP_getLastModTime(DirHandle *h,
                                        const char *name,
                                        int *fileExists)
{
    GRPinfo *info = ((GRPinfo *) h->opaque);
    PHYSFS_sint64 retval = -1;

    *fileExists = (grp_find_entry(info, name) != NULL);
    if (*fileExists)  /* use time of GRP itself in the physical filesystem. */
        retval = ((GRPinfo *) h->opaque)->last_mod_time;

    return(retval);
} /* GRP_getLastModTime */


static FileHandle *GRP_openRead(DirHandle *h, const char *fnm, int *fileExists)
{
    GRPinfo *info = ((GRPinfo *) h->opaque);
    FileHandle *retval;
    GRPfileinfo *finfo;
    GRPentry *entry;

    entry = grp_find_entry(info, fnm);
    *fileExists = (entry != NULL);
    BAIL_IF_MACRO(entry == NULL, NULL, NULL);

    retval = (FileHandle *) malloc(sizeof (FileHandle));
    BAIL_IF_MACRO(retval == NULL, ERR_OUT_OF_MEMORY, NULL);
    finfo = (GRPfileinfo *) malloc(sizeof (GRPfileinfo));
    if (finfo == NULL)
    {
        free(retval);
        BAIL_MACRO(ERR_OUT_OF_MEMORY, NULL);
    } /* if */

    finfo->handle = __PHYSFS_platformOpenRead(info->filename);
    if ( (finfo->handle == NULL) ||
         (!__PHYSFS_platformSeek(finfo->handle, entry->startPos)) )
    {
        free(finfo);
        free(retval);
        return(NULL);
    } /* if */

    finfo->curPos = 0;
    finfo->entry = entry;
    retval->opaque = (void *) finfo;
    retval->funcs = &__PHYSFS_FileFunctions_GRP;
    retval->dirHandle = h;
    return(retval);
} /* GRP_openRead */


static FileHandle *GRP_openWrite(DirHandle *h, const char *name)
{
    BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* GRP_openWrite */


static FileHandle *GRP_openAppend(DirHandle *h, const char *name)
{
    BAIL_MACRO(ERR_NOT_SUPPORTED, NULL);
} /* GRP_openAppend */


static int GRP_remove(DirHandle *h, const char *name)
{
    BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* GRP_remove */


static int GRP_mkdir(DirHandle *h, const char *name)
{
    BAIL_MACRO(ERR_NOT_SUPPORTED, 0);
} /* GRP_mkdir */

#endif  /* defined PHYSFS_SUPPORTS_GRP */

/* end of grp.c ... */