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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 Gilles Roux
* 2003 Garrett Derner
* 2010 Yoshihisa Uchida
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#include "tv_preferences.h"
#include "tv_reader.h"
#if PLUGIN_BUFFER_SIZE < 0x10000
#define TV_MIN_BLOCK_SIZE 0x800
#else
#define TV_MIN_BLOCK_SIZE 0x1000
#endif
/* UTF-8 BOM */
#define BOM "\xef\xbb\xbf"
#define BOM_SIZE 3
static int fd = -1;
static off_t file_pos;
static off_t start_file_pos;
static off_t file_size;
static unsigned char *reader_buffer;
static ssize_t buffer_size;
static ssize_t block_size;
static ssize_t buf_pos;
static ssize_t read_size;
off_t tv_get_file_size(void)
{
return file_size;
}
bool tv_is_eof(void)
{
return (file_pos + buf_pos >= file_size);
}
off_t tv_get_current_file_pos(void)
{
return file_pos + buf_pos;
}
const unsigned char *tv_get_buffer(ssize_t *bufsize)
{
*bufsize = read_size - buf_pos;
return reader_buffer + buf_pos;
}
static ssize_t tv_read(unsigned char *buf, ssize_t reqsize)
{
if (buf - reader_buffer + reqsize > buffer_size)
reqsize = buffer_size - (buf - reader_buffer);
return rb->read(fd, buf, reqsize);
}
void tv_seek(off_t offset, int whence)
{
ssize_t size;
switch (whence)
{
case SEEK_SET:
if (offset >= file_pos && offset < file_pos + read_size)
{
buf_pos = offset - file_pos;
return;
}
file_pos = offset;
break;
case SEEK_CUR:
buf_pos += offset;
if (buf_pos >= 0 && buf_pos < read_size)
{
if (buf_pos > block_size)
{
buf_pos -= block_size;
file_pos += block_size;
size = read_size - block_size;
rb->memcpy(reader_buffer, reader_buffer + block_size, size);
read_size = tv_read(reader_buffer + block_size, block_size);
if (read_size < 0)
read_size = 0;
read_size += size;
}
return;
}
file_pos += buf_pos;
break;
default:
return;
break;
}
if (whence == SEEK_SET)
{
if (file_pos < 0)
file_pos = 0;
else if (file_pos > file_size)
file_pos = file_size;
rb->lseek(fd, file_pos + start_file_pos, SEEK_SET);
buf_pos = 0;
read_size = tv_read(reader_buffer, buffer_size);
}
}
static int tv_change_preferences(const struct tv_preferences *oldp)
{
bool change_file = false;
/* open the new file */
if (oldp == NULL || rb->strcmp(oldp->file_name, preferences->file_name))
{
if (fd >= 0)
rb->close(fd);
fd = rb->open(preferences->file_name, O_RDONLY);
if (fd < 0)
return TV_CALLBACK_ERROR;
file_size = rb->filesize(fd);
change_file = true;
}
/*
* When a file is UTF-8 file with BOM, if encoding is UTF-8,
* then file size decreases only BOM_SIZE.
*/
if (change_file || oldp->encoding != preferences->encoding)
{
int old_start_file_pos = start_file_pos;
int delta_start_file_pos;
off_t cur_file_pos = file_pos + buf_pos;
file_pos = 0;
buf_pos = 0;
read_size = 0;
start_file_pos = 0;
if (preferences->encoding == UTF_8)
{
unsigned char bom[BOM_SIZE];
rb->lseek(fd, 0, SEEK_SET);
rb->read(fd, bom, BOM_SIZE);
if (rb->memcmp(bom, BOM, BOM_SIZE) == 0)
start_file_pos = BOM_SIZE;
}
delta_start_file_pos = old_start_file_pos - start_file_pos;
file_size += delta_start_file_pos;
tv_seek(cur_file_pos + delta_start_file_pos, SEEK_SET);
}
return TV_CALLBACK_OK;
}
bool tv_init_reader(unsigned char **buf, size_t *size)
{
if (*size < 2 * TV_MIN_BLOCK_SIZE)
return false;
block_size = *size / 2;
buffer_size = 2 * block_size;
reader_buffer = *buf;
*buf += buffer_size;
*size -= buffer_size;
tv_add_preferences_change_listner(tv_change_preferences);
return true;
}
void tv_finalize_reader(void)
{
if (fd >= 0)
rb->close(fd);
}
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