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author | Michiel Van Der Kolk <not.valid@email.address> | 2005-03-17 20:50:03 +0000 |
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committer | Michiel Van Der Kolk <not.valid@email.address> | 2005-03-17 20:50:03 +0000 |
commit | 27be5bc72855a0fbbdae230bc144624c9eb85f5e (patch) | |
tree | b553f1321df924c4b744ffcab48dce5f4f081f7d /apps/codecs/dumb/src/helpers/memfile.c | |
parent | 7e7662bb716917ca431204f0113d400c1014f2e8 (diff) | |
download | rockbox-27be5bc72855a0fbbdae230bc144624c9eb85f5e.tar.gz rockbox-27be5bc72855a0fbbdae230bc144624c9eb85f5e.zip |
Initial check in dumb 0.9.2 - has a few usages of floating point that should
be rewritten to fixed point. seems to compile cleanly for iriver.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6197 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/codecs/dumb/src/helpers/memfile.c')
-rw-r--r-- | apps/codecs/dumb/src/helpers/memfile.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/apps/codecs/dumb/src/helpers/memfile.c b/apps/codecs/dumb/src/helpers/memfile.c new file mode 100644 index 0000000000..b65ab5f78d --- /dev/null +++ b/apps/codecs/dumb/src/helpers/memfile.c | |||
@@ -0,0 +1,96 @@ | |||
1 | /* _______ ____ __ ___ ___ | ||
2 | * \ _ \ \ / \ / \ \ / / ' ' ' | ||
3 | * | | \ \ | | || | \/ | . . | ||
4 | * | | | | | | || ||\ /| | | ||
5 | * | | | | | | || || \/ | | ' ' ' | ||
6 | * | | | | | | || || | | . . | ||
7 | * | |_/ / \ \__// || | | | ||
8 | * /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque | ||
9 | * / \ | ||
10 | * / . \ | ||
11 | * memfile.c - Module for reading data from / / \ \ | ||
12 | * memory using a DUMBFILE. | < / \_ | ||
13 | * | \/ /\ / | ||
14 | * By entheh. \_ / > / | ||
15 | * | \ / / | ||
16 | * | ' / | ||
17 | * \__/ | ||
18 | */ | ||
19 | |||
20 | #include <stdlib.h> | ||
21 | #include <string.h> | ||
22 | |||
23 | #include "dumb.h" | ||
24 | |||
25 | |||
26 | |||
27 | typedef struct MEMFILE MEMFILE; | ||
28 | |||
29 | struct MEMFILE | ||
30 | { | ||
31 | const char *ptr; | ||
32 | long left; | ||
33 | }; | ||
34 | |||
35 | |||
36 | |||
37 | static int dumb_memfile_skip(void *f, long n) | ||
38 | { | ||
39 | MEMFILE *m = f; | ||
40 | if (n > m->left) return -1; | ||
41 | m->ptr += n; | ||
42 | m->left -= n; | ||
43 | return 0; | ||
44 | } | ||
45 | |||
46 | |||
47 | |||
48 | static int dumb_memfile_getc(void *f) | ||
49 | { | ||
50 | MEMFILE *m = f; | ||
51 | if (m->left <= 0) return -1; | ||
52 | m->left--; | ||
53 | return *(const unsigned char *)m->ptr++; | ||
54 | } | ||
55 | |||
56 | |||
57 | |||
58 | static long dumb_memfile_getnc(char *ptr, long n, void *f) | ||
59 | { | ||
60 | MEMFILE *m = f; | ||
61 | if (n > m->left) n = m->left; | ||
62 | memcpy(ptr, m->ptr, n); | ||
63 | m->ptr += n; | ||
64 | m->left -= n; | ||
65 | return n; | ||
66 | } | ||
67 | |||
68 | |||
69 | |||
70 | static void dumb_memfile_close(void *f) | ||
71 | { | ||
72 | free(f); | ||
73 | } | ||
74 | |||
75 | |||
76 | |||
77 | static DUMBFILE_SYSTEM memfile_dfs = { | ||
78 | NULL, | ||
79 | &dumb_memfile_skip, | ||
80 | &dumb_memfile_getc, | ||
81 | &dumb_memfile_getnc, | ||
82 | &dumb_memfile_close | ||
83 | }; | ||
84 | |||
85 | |||
86 | |||
87 | DUMBFILE *dumbfile_open_memory(const char *data, long size) | ||
88 | { | ||
89 | MEMFILE *m = malloc(sizeof(*m)); | ||
90 | if (!m) return NULL; | ||
91 | |||
92 | m->ptr = data; | ||
93 | m->left = size; | ||
94 | |||
95 | return dumbfile_open_ex(m, &memfile_dfs); | ||
96 | } | ||