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432/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 Dave Chapman
*
* ASF parsing code based on libasf by Juho Vähä-Herttua
* http://code.google.com/p/libasf/ libasf itself was based on the ASF
* parser in VLC - http://www.videolan.org/
*
* This program is free software; you can redistribute it and/or
* modify it under /*
** $Id: liolib.c,v 2.73.1.3 2008/01/18 17:47:43 roberto Exp $
** Standard I/O (and system) library
** See Copyright Notice in lua.h
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define liolib_c
#define LUA_LIB
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "rocklibc.h"
#define IO_INPUT 1
#define IO_OUTPUT 2
static const char *const fnames[] = {"input", "output"};
static int pushresult (lua_State *L, int i, const char *filename) {
int en = errno;
if (i) {
lua_pushboolean(L, 1);
return 1;
}
else {
lua_pushnil(L);
if (filename)
lua_pushfstring(L, "%s: %s", filename, strerror(en));
else
lua_pushfstring(L, "%s", strerror(en));
lua_pushinteger(L, 0);
return 3;
}
}
static void fileerror (lua_State *L, int arg, const char *filename) {
lua_pushfstring(L, "%s: %s", filename, strerror(errno));
luaL_argerror(L, arg, lua_tostring(L, -1));
}
static int io_type (lua_State *L) {
void *ud;
luaL_checkany(L, 1);
ud = lua_touserdata(L, 1);
lua_getfield(L, LUA_REGISTRYINDEX, LUA_FILEHANDLE);
if (ud == NULL || !lua_getmetatable(L, 1) || !lua_rawequal(L, -2, -1))
lua_pushnil(L); /* not a file */
else if (*((int *)ud) < 0)
lua_pushliteral(L, "closed file");
else
lua_pushliteral(L, "file");
return 1;
}
static int* tofile (lua_State *L) {
int *f = (int*) luaL_checkudata(L, 1, LUA_FILEHANDLE);
if (*f < 0)
luaL_error(L, "attempt to use a closed file");
return f;
}
/*
** When creating file handles, always creates a `closed' file handle
** before opening the actual file; so, if there is a memory error, the
** file is not left opened.
*/
static int* newfile (lua_State *L) {
int *pf = (int *)lua_newuserdata(L, sizeof(int));
*pf = -1; /* file handle is currently `closed' */
luaL_getmetatable(L, LUA_FILEHANDLE);
lua_setmetatable(L, -2);
return pf;
}
/*
** function to close regular files
*/
static int io_fclose (lua_State *L) {
int *p = tofile(L);
int ok = (rb->close(*p) == 0);
*p = -1;
return pushresult(L, ok, NULL);
}
static inline int aux_close (lua_State *L) {
return io_fclose(L);
}
static int io_close (lua_State *L) {
if (lua_isnone(L, 1))
lua_rawgeti(L, LUA_ENVIRONINDEX, IO_OUTPUT);
tofile(L); /* make sure argument is a file */
return aux_close(L);
}
static int io_gc (lua_State *L) {
int f = *(int*) luaL_checkudata(L, 1, LUA_FILEHANDLE);
/* ignore closed files */
if (f >= 0)
aux_close(L);
return 0;
}
static int io_tostring (lua_State *L) {
int f = *(int*) luaL_checkudata(L, 1, LUA_FILEHANDLE);
if (f < 0)
lua_pushliteral(L, "file (closed)");
else
lua_pushfstring(L, "file (%d)", f);
return 1;
}
static int io_open (lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
const char *mode = luaL_optstring(L, 2, "r");
int *pf = newfile(L);
int flags = 0;
if(*(mode+1) == '+') {
flags = O_RDWR;
switch(*mode) {
case 'w':
flags |= O_TRUNC; break;
case 'a':
flags |= O_APPEND; break;
}
}
else {
switch(*mode) {
case 'r':
flags = O_RDONLY; break;
case 'w':
flags = O_WRONLY | O_TRUNC; break;
case 'a':
flags = O_WRONLY | O_APPEND; break;
}
}
if((*mode == 'w' || *mode == 'a') && !rb->file_exists(filename))
flags |= O_CREAT;
*pf = rb->open(filename, flags, 0666);
return (*pf < 0) ? pushresult(L, 0, filename) : 1;
}
static int* getiofile (lua_State *L, int findex) {
int *f;
lua_rawgeti(L, LUA_ENVIRONINDEX, findex);
f = (int *)lua_touserdata(L, -1);
if (f == NULL || *f < 0)
luaL_error(L, "standard %s file is closed", fnames[findex - 1]);
return f;
}
static int g_iofile (lua_State *L, int f, int flags) {
if (!lua_isnoneornil(L, 1)) {
const char *filename = lua_tostring(L, 1);
if (filename) {
int *pf = newfile(L);
*pf = rb->open(filename, flags);
if (*pf < 0)
fileerror(L, 1, filename);
}
else {
tofile(L); /* check that it's a valid file handle */
lua_pushvalue(L, 1);
}
lua_rawseti(L, LUA_ENVIRONINDEX, f);
}
/* return current value */
lua_rawgeti(L, LUA_ENVIRONINDEX, f);
return 1;
}
static int io_input (lua_State *L) {
return g_iofile(L, IO_INPUT, O_RDONLY);
}
static int io_output (lua_State *L) {
return g_iofile(L, IO_OUTPUT, O_WRONLY);
}
static int io_readline (lua_State *L);
static void aux_lines (lua_State *L, int idx, int toclose) {
lua_pushvalue(L, idx);
lua_pushboolean(L, toclose); /* close/not close file when finished */
lua_pushcclosure(L, io_readline, 2);
}
static int f_lines (lua_State *L) {
tofile(L); /* check that it's a valid file handle */
aux_lines(L, 1, 0);
return 1;
}
static int io_lines (lua_State *L) {
if (lua_isnoneornil(L, 1)) { /* no arguments? */
/* will iterate over default input */
lua_rawgeti(L, LUA_ENVIRONINDEX, IO_INPUT);
return f_lines(L);
}
else {
const char *filename = luaL_checkstring(L, 1);
int *pf = newfile(L);
*pf = rb->open(filename, O_RDONLY);
if (*pf < 0)
fileerror(L, 1, filename);
aux_lines(L, lua_gettop(L), 1);
return 1;
}
}
/*
** {======================================================
** READ
** =======================================================
*/
static int read_number (lua_State *L, int *f) {
lua_Number d;
if (PREFIX(fscanf)(*f, LUA_NUMBER_SCAN, &d) == 1) {
lua_pushnumber(L, d);
return 1;
}
else return 0; /* read fails */
}
static int test_eof (lua_State *L, int *f) {
ssize_t s = rb->lseek(*f, 0, SEEK_CUR);
lua_pushlstring(L, NULL, 0);
return s != rb->filesize(*f);
}
/* Rockbox already defines read_line() */
static int _read_line (lua_State *L, int *f) {
luaL_Buffer b;
luaL_buffinit(L, &b);
for (;;) {
size_t l;
size_t r;
char *p = luaL_prepbuffer(&b);
r = rb->read_line(*f, p, LUAL_BUFFERSIZE);
l = strlen(p);
if (l == 0 || p[l-1] != '\n')
luaL_addsize(&b, l);
else {
luaL_addsize(&b, l - 1); /* do not include `eol' */
luaL_pushresult(&b); /* close buffer */
return 1; /* read at least an `eol' */
}
if (r < LUAL_BUFFERSIZE) { /* eof? */
luaL_pushresult(&b); /* close buffer */
return (lua_objlen(L, -1) > 0); /* check whether read something */
}
}
}
static int read_chars (lua_State *L, int *f, size_t n) {
size_t rlen; /* how much to read */
size_t nr; /* number of chars actually read */
luaL_Buffer b;
luaL_buffinit(L, &b);
rlen = LUAL_BUFFERSIZE; /* try to read that much each time */
do {
char *p = luaL_prepbuffer(&b);
if (rlen > n) rlen = n; /* cannot read more than asked */
nr = rb->read(*f, p, rlen);
luaL_addsize(&b, nr);
n -= nr; /* still have to read `n' chars */
} while (n > 0 && nr == rlen); /* until end of count or eof */
luaL_pushresult(&b); /* close buffer */
return (n == 0 || lua_objlen(L, -1) > 0);
}
static int g_read (lua_State *L, int *f, int first) {
int nargs = lua_gettop(L) - 1;
int success;
int n;
if (nargs == 0) { /* no arguments? */
success = _read_line(L, f);
n = first+1; GETLEN2b((packet_flags >> 3) & 0x03) +
GETLEN2b((packet_flags >> 5) & 0x03) + 6;
if (ci->read_filebuf(data, datalen) == 0) {
DEBUGF("Detected end of stream4\n");
return ASF_ERROR_EOF;
}
bytesread += datalen;
datap = data;
length = GETVALUE2b((packet_flags >> 5) & 0x03, datap);
datap += GETLEN2b((packet_flags >> 5) & 0x03);
/* sequence value is not used */
GETVALUE2b((packet_flags >> 1) & 0x03, datap);
datap += GETLEN2b((packet_flags >> 1) & 0x03);
padding_length = GETVALUE2b((packet_flags >> 3) & 0x03, datap);
datap += GETLEN2b((packet_flags >> 3) & 0x03);
send_time = get_long_le(datap);
datap += 4;
*duration = get_short_le(datap);
/*the asf_get_timestamp function advances us 12-13 bytes past the packet start,
need to undo this here so that we stay synced with the packet*/
ci->seek_buffer(ci->curpos-bytesread);
return send_time;
}
/*entry point for seeks*/
int asf_seek(int ms, asf_waveformatex_t* wfx)
{
int time, duration, delta, temp, count=0;
/*estimate packet number from bitrate*/
int initial_packet = ci->curpos/wfx->packet_size;
int packet_num = (((int64_t)ms)*(wfx->bitrate>>3))/wfx->packet_size/1000;
int last_packet = ci->id3->filesize / wfx->packet_size;
if (packet_num > last_packet) {
packet_num = last_packet;
}
/*calculate byte address of the start of that packet*/
int packet_offset = packet_num*wfx->packet_size;
/*seek to estimated packet*/
ci->seek_buffer(ci->id3->first_frame_offset+packet_offset);
temp = ms;
while (1)
{
/*for very large files it can be difficult and unimportant to find the exact packet*/
count++;
/*check the time stamp of our packet*/
time = asf_get_timestamp(&duration);
/*DEBUGF("seeked to %d ms with duration %d\n", time, duration);*/
if (time < 0) {
/*unknown error, try to recover*/
DEBUGF("UKNOWN SEEK ERROR\n");
ci->seek_buffer(ci->id3->first_frame_offset+initial_packet*wfx->packet_size);
/*seek failed so return time stamp of the initial packet*/
return asf_get_timestamp(&duration);
}
if ((time+duration>=ms && time<=ms) || count > 10) {
/*DEBUGF("Found our packet! Now at %d packet\n", packet_num);*/
return time;
} else {
/*seek again*/
delta = ms-time;
/*estimate new packet number from bitrate and our current position*/
temp += delta;
packet_num = ((temp/1000)*(wfx->bitrate>>3) - (wfx->packet_size>>1))/wfx->packet_size; //round down!
packet_offset = packet_num*wfx->packet_size;
ci->seek_buffer(ci->id3->first_frame_offset+packet_offset);
}
}
}
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