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Lua add metadata and settings reading helper module

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Adds example scripts for reading track metadata + dumping albumart
and rockbox settings

settings are now stored as a table of strings rather than a table of tables
as it saves ~15 kb of ram without adding much complexity

Change-Id: I611c312b2a60ab96e595e4710b17aedbd6c0689b
This commit is contained in:
William Wilgus 2019-09-06 19:24:26 -05:00
parent a3cbd86a51
commit 267d04d2bd
6 changed files with 342 additions and 10 deletions
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42
apps/plugins/lua/rocklib.c
View file

@ -640,8 +640,12 @@ RB_WRAP(strncasecmp)
return 1;
}
static int mem_read_write(lua_State *L, uintptr_t address, size_t maxsize)
static int mem_read_write(lua_State *L, uintptr_t address, size_t maxsize, bool isstr_p)
{
if(isstr_p) /*pointer to string (**char)*/
{
lua_settop(L, 2); /* no writes allowed */
}
intptr_t offset = (intptr_t) luaL_optnumber(L, 1, 0);
size_t size = (size_t) luaL_optnumber(L, 2, maxsize);
size_t written;
@ -716,6 +720,11 @@ static int mem_read_write(lua_State *L, uintptr_t address, size_t maxsize)
case LUA_TNIL:
case LUA_TNONE: /* reader */
{
if(isstr_p && mem)
{
lua_pushstring (L, *(char**) mem);
return 1;
}
luaL_Buffer b;
luaL_buffinit(L, &b);
while(size > 0)
@ -746,32 +755,51 @@ RB_WRAP(global_status)
{
const uintptr_t address = (uintptr_t) rb->global_status;
const size_t maxsize = sizeof(struct system_status);
return mem_read_write(L, address, maxsize);
/*const bool isstr_p = lua_toboolean(L, 4);*/
return mem_read_write(L, address, maxsize, false);
}
RB_WRAP(global_settings)
{
const uintptr_t address = (uintptr_t) rb->global_settings;
const size_t maxsize = sizeof(struct user_settings);
return mem_read_write(L, address, maxsize);
/*const bool isstr_p = lua_toboolean(L, 4);*/
return mem_read_write(L, address, maxsize, false);
}
RB_WRAP(audio_next_track)
{
lua_settop(L, 2); /* no writes allowed */
const uintptr_t address = (uintptr_t) rb->audio_next_track();
const size_t maxsize = sizeof(struct mp3entry);
return mem_read_write(L, address, maxsize);
const bool isstr_p = lua_toboolean(L, 4);
lua_settop(L, 2); /* no writes allowed */
return mem_read_write(L, address, maxsize, isstr_p);
}
RB_WRAP(audio_current_track)
{
lua_settop(L, 2); /* no writes allowed */
const uintptr_t address = (uintptr_t) rb->audio_current_track();
const size_t maxsize = sizeof(struct mp3entry);
return mem_read_write(L, address, maxsize);
const bool isstr_p = lua_toboolean(L, 4);
lua_settop(L, 2); /* no writes allowed */
return mem_read_write(L, address, maxsize, isstr_p);
}
#if 0
RB_WRAP(read_mem)
{
lua_settop(L, 2); /* no writes allowed */
const uintptr_t address = lua_tonumber(L, 1);
const size_t maxsize = luaL_optnumber(L, 2, strlen((char *)address));
luaL_argcheck(L, address > 0, 1, ERR_IDX_RANGE);
lua_pushnil(L);
lua_replace(L, -3);/* stk pos 1 is no longer offset it is starting address */
return mem_read_write(L, address, maxsize, false);
}
#endif
RB_WRAP(restart_lua)
{
/*close lua state, open a new lua state, load script @ filename */