1 /***************************************************************************
2 * Copyright (c) 2024 Microsoft Corporation
3 *
4 * This program and the accompanying materials are made available under the
5 * terms of the MIT License which is available at
6 * https://opensource.org/licenses/MIT.
7 *
8 * SPDX-License-Identifier: MIT
9 **************************************************************************/
10
11
12 /**************************************************************************/
13 /**************************************************************************/
14 /** */
15 /** FileX Component */
16 /** */
17 /** Media */
18 /** */
19 /**************************************************************************/
20 /**************************************************************************/
21
22 #define FX_SOURCE_CODE
23
24
25 /* Include necessary system files. */
26
27 #include "fx_api.h"
28 #include "fx_system.h"
29 #include "fx_media.h"
30
31
32 /**************************************************************************/
33 /* */
34 /* FUNCTION RELEASE */
35 /* */
36 /* _fx_media_space_available PORTABLE C */
37 /* 6.1 */
38 /* AUTHOR */
39 /* */
40 /* William E. Lamie, Microsoft Corporation */
41 /* */
42 /* DESCRIPTION */
43 /* */
44 /* This function returns the number of bytes available in the */
45 /* specified media. */
46 /* */
47 /* INPUT */
48 /* */
49 /* media_ptr Media control block pointer */
50 /* available_bytes_ptr Pointer to available bytes */
51 /* destination */
52 /* */
53 /* OUTPUT */
54 /* */
55 /* return status */
56 /* */
57 /* CALLS */
58 /* */
59 /* None */
60 /* */
61 /* _fx_media_extended_space_available Actual space available service*/
62 /* */
63 /* CALLED BY */
64 /* */
65 /* Application Code */
66 /* */
67 /* RELEASE HISTORY */
68 /* */
69 /* DATE NAME DESCRIPTION */
70 /* */
71 /* 05-19-2020 William E. Lamie Initial Version 6.0 */
72 /* 09-30-2020 William E. Lamie Modified comment(s), */
73 /* resulting in version 6.1 */
74 /* */
75 /**************************************************************************/
_fx_media_space_available(FX_MEDIA * media_ptr,ULONG * available_bytes_ptr)76 UINT _fx_media_space_available(FX_MEDIA *media_ptr, ULONG *available_bytes_ptr)
77 {
78
79 UINT status;
80 ULONG64 available_bytes;
81
82 /* Call actual media space available service. */
83 status = _fx_media_extended_space_available(media_ptr, &available_bytes);
84
85 /* Check status. */
86 if (status == FX_SUCCESS)
87 {
88
89 /* Determine if more than 4GB available. */
90 if (available_bytes > 0x00000000FFFFFFFF)
91 {
92
93 /* Yes, we must have more than 4GB available... report the maximum we can fit
94 in 32bits, which is 4GB. */
95 *available_bytes_ptr = 0xFFFFFFFF;
96 }
97 else
98 {
99 *available_bytes_ptr = (ULONG)(available_bytes);
100 }
101 }
102
103 /* Return status to the caller. */
104 return(status);
105 }
106
107
