1 /*
2 * Copyright 2020 Lag Free Games, LLC
3 * All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sub license, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the
14 * next paragraph) shall be included in all copies or substantial portions
15 * of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
20 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
21 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
22 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
23 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26 #include "memstream.h"
27
28 #include <stdlib.h>
29
30 #ifdef _WIN32
31 #include <windows.h>
32 #endif
33
34 bool
u_memstream_open(struct u_memstream * mem,char ** bufp,size_t * sizep)35 u_memstream_open(struct u_memstream *mem, char **bufp, size_t *sizep)
36 {
37 #ifdef _GAMING_XBOX
38 int err = tmpfile_s(&mem->f);
39 mem->bufp = bufp;
40 mem->sizep = sizep;
41
42 return err == 0;
43 #elif defined(_WIN32)
44 bool success = false;
45
46 char path[MAX_PATH];
47 DWORD dwResult = GetTempPath(MAX_PATH, path);
48 if ((dwResult > 0) && (dwResult < MAX_PATH)) {
49 char *temp = mem->temp;
50 UINT uResult = GetTempFileName(path, "MEMSTREAM", 0, temp);
51 if (uResult != 0) {
52 FILE *f = fopen(temp, "w+b");
53 success = f != NULL;
54 if (success)
55 {
56 *bufp = NULL;
57 *sizep = 0;
58 mem->f = f;
59 mem->bufp = bufp;
60 mem->sizep = sizep;
61 }
62 }
63 }
64
65 return success;
66 #else
67 FILE *const f = open_memstream(bufp, sizep);
68 mem->f = f;
69 return f != NULL;
70 #endif
71 }
72
73 #ifdef _WIN32
74 static void
u_memstream_update_buffer(struct u_memstream * mem)75 u_memstream_update_buffer(struct u_memstream *mem)
76 {
77 FILE *const f = mem->f;
78 long size = ftell(f);
79 if (size > 0) {
80 /* reserve space for the null terminator as well */
81 if (*mem->bufp == NULL || *mem->sizep < size + 1)
82 *mem->bufp = realloc(*mem->bufp, size + 1);
83
84 fseek(f, 0, SEEK_SET);
85 fread(*mem->bufp, 1, size, f);
86 (*mem->bufp)[size] = '\0';
87 }
88 *mem->sizep = size;
89 }
90 #endif /* _WIN32 */
91
92 void
u_memstream_close(struct u_memstream * mem)93 u_memstream_close(struct u_memstream *mem)
94 {
95 FILE *const f = mem->f;
96
97 #ifdef _WIN32
98 u_memstream_update_buffer(mem);
99 remove(mem->temp);
100 #endif
101
102 fclose(f);
103 }
104
105 int
u_memstream_flush(struct u_memstream * mem)106 u_memstream_flush(struct u_memstream *mem)
107 {
108 #ifndef _WIN32
109 return fflush(mem->f);
110 #else
111 u_memstream_update_buffer(mem);
112 return 0;
113 #endif /* _WIN32 */
114 }
115