memstream.c revision 7ec681f3 
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
30bool
31u_memstream_open(struct u_memstream *mem, char **bufp, size_t *sizep)
32{
33#if defined(_WIN32)
34   bool success = false;
35
36   char path[MAX_PATH];
37   DWORD dwResult = GetTempPath(MAX_PATH, path);
38   if ((dwResult > 0) && (dwResult < MAX_PATH)) {
39      char *temp = mem->temp;
40      UINT uResult = GetTempFileName(path, "MEMSTREAM", 0, temp);
41      if (uResult != 0) {
42         FILE *f = fopen(temp, "w+b");
43         success = f != NULL;
44         if (success)
45         {
46            mem->f = f;
47            mem->bufp = bufp;
48            mem->sizep = sizep;
49         }
50      }
51   }
52
53   return success;
54#elif defined(__APPLE__)
55   return false;
56#else
57   FILE *const f = open_memstream(bufp, sizep);
58   mem->f = f;
59   return f != NULL;
60#endif
61}
62
63void
64u_memstream_close(struct u_memstream *mem)
65{
66   FILE *const f = mem->f;
67
68#ifdef _WIN32
69   long size = ftell(f);
70   if (size > 0) {
71      char *buf = malloc(size);
72      fseek(f, 0, SEEK_SET);
73      fread(buf, 1, size, f);
74
75      *mem->bufp = buf;
76      *mem->sizep = size;
77   }
78
79   remove(mem->temp);
80#endif
81
82   fclose(f);
83}
84