A modern Music Player Daemon based on Rockbox open source high quality audio player
tsiry-sandratraina.com
libadwaita
audio
rust
zig
deno
mpris
rockbox
mpd
1/*
2** $Id: lzio.c,v 1.31.1.1 2007/12/27 13:02:25 roberto Exp $
3** a generic input stream interface
4** See Copyright Notice in lua.h
5*/
6
7
8#include <string.h>
9
10#define lzio_c
11#define LUA_CORE
12
13#include "lua.h"
14
15#include "llimits.h"
16#include "lmem.h"
17#include "lstate.h"
18#include "lzio.h"
19
20
21int luaZ_fill (ZIO *z) {
22 size_t size;
23 lua_State *L = z->L;
24 const char *buff;
25 if (!z->reader)
26 return EOZ;
27 lua_unlock(L);
28 buff = z->reader(L, z->data, &size);
29 lua_lock(L);
30 if (buff == NULL || size == 0) {
31 z->reader = NULL; /* avoid calling reader function next time */
32 return EOZ;
33 }
34 z->n = size - 1;
35 z->p = buff;
36 return char2int(*(z->p++));
37}
38
39
40int luaZ_lookahead (ZIO *z) {
41 if (z->n == 0) {
42 if (luaZ_fill(z) == EOZ)
43 return EOZ;
44 else {
45 z->n++; /* luaZ_fill removed first byte; put back it */
46 z->p--;
47 }
48 }
49 return char2int(*z->p);
50}
51
52
53void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) {
54 z->L = L;
55 z->reader = reader;
56 z->data = data;
57 z->n = 0;
58 z->p = NULL;
59}
60
61
62/* --------------------------------------------------------------- read --- */
63size_t luaZ_read (ZIO *z, void *b, size_t n) {
64 while (n) {
65 size_t m;
66 if (luaZ_lookahead(z) == EOZ)
67 return n; /* return number of missing bytes */
68 m = (n <= z->n) ? n : z->n; /* min. between n and z->n */
69 memcpy(b, z->p, m);
70 z->n -= m;
71 z->p += m;
72 b = (char *)b + m;
73 n -= m;
74 }
75 return 0;
76}
77
78/* ------------------------------------------------------------------------ */
79char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n) {
80 if (n > buff->buffsize) {
81 if (n < LUA_MINBUFFER) n = LUA_MINBUFFER;
82 luaZ_resizebuffer(L, buff, n);
83 }
84 return buff->buffer;
85}
86
87