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comparison Isolated/ALmixer_RWops.c @ 38:71b465ff0622

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Added support files.
author Eric Wing <ewing@anscamobile.com>
date Thu, 28 Apr 2011 16:22:30 -0700
parents
children 208a9ed20087
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37:b346b6608eab 38:71b465ff0622
1 #ifndef ALMIXER_COMPILED_WITH_SDL
2
3 #include "ALmixer_RWops.h"
4 #include <stdlib.h> /* malloc, free */
5 #include <stdio.h> /* fopen, fseek, fread, fclose */
6 #include <string.h> /* strerror */
7 #include <errno.h> /* errno */
8
9 /* (Note this is different than stdio's seek. This returns ftell.)
10 */
11 static int stdio_seek(ALmixer_RWops* the_context, long offset, int whence)
12 {
13 if(0 == fseek(the_context->hidden.stdio.fp, offset, whence))
14 {
15 return(ftell(the_context->hidden.stdio.fp));
16 }
17 else
18 {
19 /* ALmixer_SetError("ALmixer_RWops seek failed: %s", strerror(errno)); */
20 return (-1);
21 }
22 }
23
24 static size_t stdio_read(ALmixer_RWops* the_context, void* ptr, size_t size, size_t nitems)
25 {
26 size_t bytes_read;
27
28 bytes_read = fread(ptr, size, nitems, the_context->hidden.stdio.fp);
29 if(0 == bytes_read && ferror(the_context->hidden.stdio.fp))
30 {
31 /* not sure if strerror can convert ferror */
32 /* ALmixer_SetError("ALmixer_RWops read failed: %s", strerror(ferror(the_context->hidden.stdio.fp))); */
33 }
34 return bytes_read;
35 }
36
37 static size_t stdio_write(ALmixer_RWops* the_context, const void* ptr, size_t size, size_t nitems)
38 {
39 size_t bytes_written;
40
41 bytes_written = fwrite(ptr, size, nitems, the_context->hidden.stdio.fp);
42 if(0 == bytes_written && ferror(the_context->hidden.stdio.fp))
43 {
44 /* ALmixer_SetError("ALmixer_RWops write failed: %s", strerror(ferror(the_context->hidden.stdio.fp))); */
45 }
46 return bytes_written;
47 }
48
49 static int stdio_close(ALmixer_RWops* the_context)
50 {
51 int return_status = 0;
52 if(NULL != the_context)
53 {
54 if(0 != the_context->hidden.stdio.autoclose)
55 {
56 if(0 != fclose(the_context->hidden.stdio.fp))
57 {
58 /* ALmixer_SetError("ALmixer_RWops close failed: %s", strerror(errno)); */
59 return_status = -1;
60 }
61 }
62 free(the_context);
63 }
64 return return_status;
65 }
66
67 ALmixer_RWops* ALmixer_RWFromFP(FILE* file_pointer, char autoclose_flag)
68 {
69 ALmixer_RWops* rw_ops = NULL;
70
71 rw_ops = (ALmixer_RWops*)malloc(sizeof(ALmixer_RWops));
72 if(NULL == rw_ops)
73 {
74 /* ALmixer_SetError("ALmixer_RWFromFP: Out of memory"); */
75 return NULL;
76 }
77
78 rw_ops->seek = stdio_seek;
79 rw_ops->read = stdio_read;
80 rw_ops->write = stdio_write;
81 rw_ops->close = stdio_close;
82 rw_ops->hidden.stdio.fp = file_pointer;
83 rw_ops->hidden.stdio.autoclose = autoclose_flag;
84 return rw_ops;
85 }
86
87 ALmixer_RWops* ALmixer_RWFromFile(const char* file_name, const char* file_mode)
88 {
89 ALmixer_RWops* rw_ops = NULL;
90 FILE* file_pointer = NULL;
91 if(NULL == file_name || NULL == file_mode)
92 {
93 /* ALmixer_SetError("ALmixer_RWFromFile: No file or mode specified"); */
94 return NULL;
95 }
96 file_pointer = fopen(file_name, file_mode);
97 if(NULL == file_pointer)
98 {
99 /* ALmixer_SetError("ALmixer_RWFromFile: Could not open file: %s", strerror(errno)); */
100 return NULL;
101 }
102
103 rw_ops = ALmixer_RWFromFP(file_pointer, 1);
104 return rw_ops;
105 }
106
107
108 #endif /* ALMIXER_COMPILED_WITH_SDL */