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/* ****************************************************************************
* link/seven/dataflow.c -- data exchanging flows.
* Copyright (C) 2016-2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
*
* This file is part of libcasio.
* libcasio is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3.0 of the License,
* or (at your option) any later version.
*
* libcasio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with libcasio; if not, see <http://www.gnu.org/licenses/>.
*
* These functions are about sending and receiving data buffers.
* ************************************************************************* */
#include "data.h"
#define ONEBUF CASIO_SEVEN_MAX_RAWDATA_SIZE
#define BUFNUM 64
#define BUFSIZE (ONEBUF * BUFNUM)
/* ************************************************************************* */
/* Buffer version */
/* ************************************************************************* */
/**
* casio_seven_send_buffer:
* Part of the packet flows where data is sent.
*
* @arg handle the link handle
* @arg buffer the buffer to read from
* @arg size the buffer size
* @arg shift should shift?
* @arg disp the display callback.
* @arg dcookie the display callback cookie.
* @return the error (0 if ok)
*/
int CASIO_EXPORT casio_seven_send_buffer(casio_link_t *handle,
casio_stream_t *buffer, casio_off_t size, int shift,
casio_link_progress_t *disp, void *dcookie)
{
int err, stream_err, resp; unsigned char buf[8 + BUFSIZE];
unsigned int id, total, lastsize, datasize;
/* Get the vars set up. */
lastsize = size % ONEBUF;
total = (unsigned int)(size / ONEBUF) + !!lastsize;
if (!lastsize) lastsize = ONEBUF;
/* Initialize the progress displayer. */
if (disp) (*disp)(dcookie, 1, 0);
/* Data sending loop. */
datasize = total == 1 ? lastsize : ONEBUF;
resp = !shift;
for (id = 1; id <= total;) {
unsigned char *p = buf;
size_t toread;
/* Read the big block. */
toread = min(BUFSIZE, size);
err = casio_read(buffer, buf + 8, toread);
if (err) return (casio_error_noread);
size -= toread;
/* Send each block. */
for (; toread && id <= total; id++) {
if (id == total)
datasize = lastsize;
/* Send the packet. */
msg((ll_info, "Sending packet %u/%u (%uo)", id, total, datasize));
stream_err = casio_seven_send_quick_data_packet(handle, total, id,
p, datasize, resp);
if (stream_err) { err = casio_error_noread; goto fail; }
p += datasize; toread -= datasize; resp = 1;
/* Display the progress. */
if (disp) (*disp)(dcookie, id, total);
/* Check the response. */
if (response.casio_seven_packet_type != casio_seven_type_ack) {
msg((ll_error, "Calculator didn't send ACK, wtf?"));
err = casio_error_unknown;
goto fail;
}
}
}
/* Unshift. */
if (handle->casio_link_flags & casio_linkflag_shifted)
err = casio_seven_unshift(handle);
fail:
return (err);
}
/**
* casio_seven_get_buffer:
* Part of the packet flows where data is received.
*
* Do not send an ack before going in this function, it will do it.
*
* @arg handle the link handle
* @arg buffer the buffer to write to.
* @arg shift should shift?
* @arg disp the display callback.
* @arg dcookie the display callback cookie.
* @return the error (0 if ok)
*/
int CASIO_EXPORT casio_seven_get_buffer(casio_link_t *handle,
casio_stream_t *buffer, casio_off_t size, int shift,
casio_link_progress_t *disp, void *dcookie)
{
int err, buf_err; unsigned char buf[BUFSIZE];
unsigned char *p = buf; size_t ps = 0;
/* Initialize the progress displayer. */
if (disp) (*disp)(dcookie, 1, 0);
/* If shifting is enabled, send an ACK to double the first one.
* This has proven to be very unstable. You really shouldn't use this
* in a non-experimental program. */
if (shift) casio_seven_send_ack(handle, 0);
/* Main receiving loop. */
while (size) {
/* Send the ACK. */
err = casio_seven_send_ack(handle, 1);
if (err) {
msg((ll_error, "Couldn't send the ACK."));
goto fail;
}
/* If the response is not data, wtf? */
if (response.casio_seven_packet_type != casio_seven_type_data) {
msg((ll_error, "Packet type wasn't data, wtf?"));
err = casio_error_unknown;
goto fail;
}
/* Display the progress. */
if (disp) (*disp)(dcookie, response.casio_seven_packet_id,
response.casio_seven_packet_total);
/* Check if there is an overflow. */
if ((casio_off_t)response.casio_seven_packet_data_size > size)
response.casio_seven_packet_data_size = (unsigned int)size;
/* Copy the data. */
memcpy(p, response.casio_seven_packet_data,
response.casio_seven_packet_data_size);
p += response.casio_seven_packet_data_size;
ps += response.casio_seven_packet_data_size;
size -= response.casio_seven_packet_data_size;
/* Check if we should empty the buffer. */
if (ps >= BUFSIZE - CASIO_SEVEN_MAX_RAWDATA_SIZE || !size) {
msg((ll_info, "buffer too full, should be emptied"));
/* Empty the buffer in the stream. */
buf_err = casio_write(buffer, buf, ps);
if (buf_err) { err = casio_error_nowrite; goto fail; }
/* Reset the pointer. */
p = buf; ps = 0;
}
}
/* Send the last ACK. */
err = casio_seven_send_ack(handle, 1);
if (err) {
msg((ll_error, "Unable to send the last ACK."));
goto fail;
}
/* Unshift if needed -- FIXME? */
if (shift) {
err = casio_seven_unshift(handle);
if (err) goto fail;
}
/* end */
err = 0;
fail:
return (err);
}
/* ************************************************************************* */
/* Data version */
/* ************************************************************************* */
/**
* casio_seven_send_data:
* Part of the packet flow where data is sent - buffer version.
*
* @arg handle the link handle.
* @arg vbuf the buffer.
* @arg size the number of bytes of the buffer to send.
* @arg shift should shift?
* @arg disp the display function.
* @arg dcookie the display function cookie.
* @return the error code (0 if ok)
*/
int CASIO_EXPORT casio_seven_send_data(casio_link_t *handle, const void *vbuf,
casio_off_t size, int shift, casio_link_progress_t *disp,
void *dcookie)
{
int err = 0;
casio_stream_t *stream;
err = casio_open_memory(&stream, vbuf, size);
if (err) return (err);
err = casio_seven_send_buffer(handle, stream, size, shift, disp, dcookie);
if (err) { casio_close(stream); return (err); }
return (casio_close(stream));
}
/**
* casio_seven_get_data:
* Part of the packet flow where data is received - buffer version.
*
* @arg handle the link handle.
* @arg vbuf the final buffer (uncasted)
* @arg size the buffer size (and size to receive)
* @arg shift should shift?
* @arg disp the display function.
* @arg dcookie the display function callback.
* @return the error code (0 if ok).
*/
int CASIO_EXPORT casio_seven_get_data(casio_link_t *handle, void *vbuf,
casio_off_t size, int shift, casio_link_progress_t disp, void *dcookie)
{
int err = 0;
casio_stream_t *stream;
err = casio_open_memory(&stream, vbuf, size);
if (err) return (err);
err = casio_seven_get_buffer(handle, stream, size, shift, disp, dcookie);
if (err) { casio_close(stream); return (err); }
return (casio_close(stream));
}
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