1 | #include "alutInternal.h" |
---|
2 | #include <string.h> |
---|
3 | |
---|
4 | struct OutputStream_struct |
---|
5 | { |
---|
6 | char *data; |
---|
7 | char *current; |
---|
8 | size_t maximumLength; |
---|
9 | }; |
---|
10 | |
---|
11 | /**************************************************************************** |
---|
12 | * The functions below know the internal OutputStream representation. |
---|
13 | ****************************************************************************/ |
---|
14 | |
---|
15 | OutputStream * |
---|
16 | _alutOutputStreamConstruct (size_t maximumLength) |
---|
17 | { |
---|
18 | OutputStream *stream = (OutputStream *) _alutMalloc (sizeof (OutputStream)); |
---|
19 | if (stream == NULL) |
---|
20 | { |
---|
21 | return NULL; |
---|
22 | } |
---|
23 | stream->data = _alutMalloc (maximumLength); |
---|
24 | if (stream->data == NULL) |
---|
25 | { |
---|
26 | free (stream); |
---|
27 | return NULL; |
---|
28 | } |
---|
29 | stream->current = stream->data; |
---|
30 | stream->maximumLength = maximumLength; |
---|
31 | return stream; |
---|
32 | } |
---|
33 | |
---|
34 | ALboolean |
---|
35 | _alutOutputStreamDestroy (OutputStream *stream) |
---|
36 | { |
---|
37 | free (stream->data); |
---|
38 | free (stream); |
---|
39 | return AL_TRUE; |
---|
40 | } |
---|
41 | |
---|
42 | void * |
---|
43 | _alutOutputStreamGetData (OutputStream *stream) |
---|
44 | { |
---|
45 | return stream->data; |
---|
46 | } |
---|
47 | |
---|
48 | size_t |
---|
49 | _alutOutputStreamGetLength (OutputStream *stream) |
---|
50 | { |
---|
51 | return stream->current - stream->data; |
---|
52 | } |
---|
53 | |
---|
54 | static ALboolean |
---|
55 | streamWrite (OutputStream *stream, const void *ptr, size_t numBytesToWrite) |
---|
56 | { |
---|
57 | size_t remainingLength = |
---|
58 | stream->maximumLength - _alutOutputStreamGetLength (stream); |
---|
59 | if (remainingLength < numBytesToWrite) |
---|
60 | { |
---|
61 | /* this should never happen within our library */ |
---|
62 | _alutSetError (ALUT_ERROR_IO_ERROR); |
---|
63 | return AL_FALSE; |
---|
64 | } |
---|
65 | memcpy (stream->current, ptr, numBytesToWrite); |
---|
66 | stream->current += numBytesToWrite; |
---|
67 | return AL_TRUE; |
---|
68 | } |
---|
69 | |
---|
70 | /**************************************************************************** |
---|
71 | * The utility functions below do not know the internal OutputStream |
---|
72 | * representation. |
---|
73 | ****************************************************************************/ |
---|
74 | |
---|
75 | ALboolean |
---|
76 | _alutOutputStreamWriteInt16BE (OutputStream *stream, Int16BigEndian value) |
---|
77 | { |
---|
78 | unsigned char buf[2]; |
---|
79 | buf[0] = (unsigned char) (value >> 8); |
---|
80 | buf[1] = (unsigned char) value; |
---|
81 | return streamWrite (stream, buf, 2); |
---|
82 | } |
---|
83 | |
---|
84 | ALboolean |
---|
85 | _alutOutputStreamWriteInt32BE (OutputStream *stream, Int32BigEndian value) |
---|
86 | { |
---|
87 | unsigned char buf[4]; |
---|
88 | buf[0] = (unsigned char) (value >> 24); |
---|
89 | buf[1] = (unsigned char) (value >> 16); |
---|
90 | buf[2] = (unsigned char) (value >> 8); |
---|
91 | buf[3] = (unsigned char) value; |
---|
92 | return streamWrite (stream, buf, 4); |
---|
93 | } |
---|