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didadit.cpp
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didadit.cpp
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/***************************************************************
BayCom(R) Packet-Radio fuer IBM PC
OpenBCM-Mailbox
------------------------
DIDADIT-Protocol for BCM
------------------------
Copyright (C) Johann Hanne, DH3MB, [email protected]
Rot-Kreuz-Gasse 9
D-85072 Eichstaett
Alle Rechte vorbehalten / All Rights Reserved
DIDADIT is (c) 1409.org, see http://1409.org/projects/didadit/
***************************************************************/
//19990401 DH3MB Begin of implementation (SPEC V0.5.3)
//19990406 DH3MB Switched to SPEC V0.5.4
//19990416 DH3MB Switched to SPEC V0.5.5
//19990520 DH3MB Switched to SPEC V0.5.7
//20000312 DH3MB Switched to SPEC V0.9.1
//20000316 DH3MB Phew - transmission finally works somehow
//20000322 DH3MB Reception also works
// However, there are severel things to do
//20000711 DG4IAD Now ::usefile() is used to get the path
// to store in. fixed unstuffing
//20000712 DG4IAD Reverted to previous behaviour. Now ::usepath()
// sets the path. New methods getfilename,getsize
// for binmail.
//20000713 DK2UI added #define DEBUG_DIDADIT
//20020524 DK2UI added setfiletime
//20020927 DF3VI DGET Zugriffsrecht wie bei BGET
//20030708 DH8YMB Fixed MD5-Problem with RX
//20030710 DH8YMB CPS-Ausgabe bei erfolgreichem RX/TX
#include "baycom.h"
#ifdef FEATURE_DIDADIT
/*---------------------------------------------------------------------------*/
fileio_dida::fileio_dida (void) : fileio()
//*************************************************************************
//
//*************************************************************************
{
bl = (struct block_info *) t_malloc(sizeof(struct block_info), "dida");
bl->maxlen = 0;
f->requires = REQ_MD5HASH;
waitforheader = 1;
*sendname = 0;
}
/*---------------------------------------------------------------------------*/
fileio_dida::~fileio_dida (void) // TODO? : fileio::~fileio()
//*************************************************************************
//
//*************************************************************************
{
if (bl->maxlen > 0) free_blockmem();
t_free(bl);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::set_path (const char *path)
//*************************************************************************
//
//*************************************************************************
{
strcpy(f->path, path);
strcpy(f->fullname, "/dev/null");
}
/*---------------------------------------------------------------------------*/
void fileio_dida::set_waitforheader (int bo)
//*************************************************************************
//
//*************************************************************************
{
waitforheader = bo;
}
/*---------------------------------------------------------------------------*/
void fileio_dida::get_filename (char *name)
//*************************************************************************
//
//*************************************************************************
{
strcpy(name, f->name);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::set_sendname (const char *name)
//*************************************************************************
//
//*************************************************************************
{
strcpy(sendname, name);
}
/*---------------------------------------------------------------------------*/
unsigned long fileio_dida::get_size ()
//*************************************************************************
//
//*************************************************************************
{
// return (f->size);
return filesize(f->fullname);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_stuffed (char ch)
//*************************************************************************
//
//*************************************************************************
{
switch (ch)
{
case FEND: bputv(FESC); bputv(TFEND); break;
case FESC: bputv(FESC); bputv(TFESC); break;
default: bputv(ch); break;
}
}
/*---------------------------------------------------------------------------*/
char fileio_dida::rx_stuffed (void)
//*************************************************************************
//
//*************************************************************************
{
char ch = getv();
stuffresult = 0;
switch (ch)
{
case FEND: stuffresult = 1; return(0);
case FESC: ch = getv();
switch (ch)
{
case TFEND: return(FEND);
case TFESC: return(FESC);
default:
trace(serious, "debug", "unstuff, received FESC, then: %c", ch);
stuffresult = 2;
return(0);
}
default: return(ch);
}
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_block (unsigned short int type, char tx_md5hash,
char *data, unsigned long int length)
//*************************************************************************
//
//*************************************************************************
{
int i;
crcthp crc_;
bputv(FEND);
MD5 md5;
md5.readfile(f->fullname, f->offset);
md5.getdigest(f->md5hash);
#ifdef DEBUG_DIDADIT
// trace(report, "debug", "md5hash: %s", f->md5hash);
#endif
tx_stuffed(type % 256);
tx_stuffed(type / 256);
crc_.update(type % 256);
crc_.update(type / 256);
if (tx_md5hash)
for (i = 0; i < 16; i++)
{
tx_stuffed(f->md5hash[i]);
crc_.update(f->md5hash[i]);
}
while (length--)
{
tx_stuffed(*data);
crc_.update(*(data++));
}
tx_stuffed(crc_.result % 256);
tx_stuffed(crc_.result / 256);
bputv(FEND);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::rx_block ()
//*************************************************************************
//
// Empfaengt ein DIDADIT-Frame; es wird dabei solange empfangen, bis
// ein korrektes Frame angekommen ist; alle ungueltigen Frames werden
// einfach verworfen (egal, ob es sich um einen CRC-Fehler handelt,
// das Frame zu lang war, etc.).
//
// An das letzte empfange Byte in data wird ein 0-Byte angehaengt, was
// fuer die Auswertung von Text-Bloecken ganz nuetzlich ist.
//
//*************************************************************************
{
char rxstate;
char typelen; // Number of type-bytes already received
int md5len; // Number of md5hash-bytes already received
unsigned short int datalen; // Number of data-bytes already received
char ch;
crcthp crc_;
char crcbuf[2]; // Die CRC wird um 2 Bytes verzoegert mitgerechnet, um
// die empfangene CRC selbst nicht miteinzuberechnen
if (! bl->maxlen)
{
trace(serious, "rx didadit block", "no mem allocated");
return;
}
for (;;)
{
rxstate = R_RX_STATE_TYPE;
typelen = 0;
md5len = 0;
datalen = 0;
crc_.result = 0; // TODO: Make crc_.reset() method
for (ch = rx_stuffed(); stuffresult != 1; ch = rx_stuffed())
{
if (stuffresult == 2)
{ // Received an invalid ESCape-sequence
rxstate = R_RX_STATE_INVALID;
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "***1");
#endif
}
// Wenn die Typ-ID (zwei Bytes) vollstaendig empfangen wurde, kann mit
// der Berechnung der CRC begonnen werden
if (typelen == 2) crc_.update(*crcbuf);
crcbuf[0] = crcbuf[1];
crcbuf[1] = ch;
switch (rxstate)
{
case R_RX_STATE_TYPE:
if (typelen == 0) *((char *) &bl->type) = ch; // Received first type-byte
else // Received second type-byte
{
*(((char *) &bl->type) + 1) = ch;
// Frame-types which include a md5-hash:
if ( bl->type == R_BLOCK_ERR
|| bl->type == R_BLOCK_DATA
|| bl->type == R_BLOCK_REQ
|| bl->type == R_BLOCK_FIN
|| bl->type == R_BLOCK_FINACK
|| bl->type == R_BLOCK_ABORT)
rxstate = R_RX_STATE_MD5HASH;
else
rxstate = R_RX_STATE_DATA;
}
typelen++;
break;
case R_RX_STATE_MD5HASH:
bl->md5hash[md5len] = ch;
#ifdef DEBUG_DIDADIT
// trace(report, "debug", "state %c", bl->md5hash[md5len]);
#endif
if (++md5len == 16) rxstate = R_RX_STATE_DATA;
break;
case R_RX_STATE_DATA:
bl->data[datalen++] = ch;
if (datalen > (bl->maxlen + 2)) rxstate = R_RX_STATE_INVALID;
break;
case R_RX_STATE_INVALID:
// Frame is already known to be invalid, do nothing
break;
}
}
// Frame not complete?
if (! (rxstate == R_RX_STATE_DATA && datalen >= 2))
{
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "***2");
#endif
continue;
}
// Check the CRC (stored in the last two bytes of the frame)
datalen -= 2;
if (*(unsigned short int*) (bl->data + datalen) == crc_.result)
{ // CRC ok
bl->data[datalen] = 0;
break;
}
else
{
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "***3");
#endif
waitfor(e_ticsfull);
}
}
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "rx block ended");
#endif
bl->len = datalen;
}
/*---------------------------------------------------------------------------*/
void fileio_dida::alloc_blockmem (unsigned short int size)
//*************************************************************************
//
// Allocates memory for receiving a DIDADIT block
//
// rx_block checks, if the allocated memory for the block is sufficient
// if not, the received block is silently ignored
//
//*************************************************************************
{
if (bl->maxlen > 0) free_blockmem();
bl->data = (char *) t_malloc(size + 2, "dida");
bl->maxlen = size;
}
/*---------------------------------------------------------------------------*/
void fileio_dida::free_blockmem ()
//*************************************************************************
//
// Frees memory allocated with alloc_blockmem()
//
//*************************************************************************
{
t_free(bl->data);
bl->maxlen = 0;
}
/*---------------------------------------------------------------------------*/
char *fileio_dida::parse_textblock (char *block, char **id, char **value)
//*************************************************************************
//
// Wird zum parsen eines DIDADIT-Text-Blocks (INFO, START)
// verwendet, das Informationen in der Form "ID=Wert\r" enthaelt
// Es werden das "=" und das "\r" (=CR) durch ein 0-Byte ersetzt
// *id wird auf den Anfang der ID gesetzt, *value auf den Anfang
// des Werts
// Zurueckgegeben wird ein Pointer auf das naechste Feld oder NULL,
// wenn kein Feld gefunden wurde
//
// Wichtig: Der gesamte Block muss mit einem 0-Byte abgeschlossen sein,
// ausserdem wird der uebergebene Block veraendert!
//
//*************************************************************************
{
char *equal, *end;
if ((equal = strchr(block, '=')) != 0 && (end = strchr (block, CR)) != 0)
{
*equal = 0;
*end = 0;
*id = block;
*value = equal + 1;
return(end + 1);
}
else return(0);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::parse_INFO (char *md5str, unsigned short int *rxed_blocksize)
//*************************************************************************
//
//
//
//*************************************************************************
{
char *block = bl->data, *id, *value;
*f->fullname = 0;
*f->name = 0;
// *f->path = 0;
f->size = 0L;
*md5str = 0;
f->unixtime = 0L;
*rxed_blocksize = 0;
*partner_ver = 0;
while ((block = parse_textblock(block, &id, &value)) != NULL)
{
if (! strcasecmp(id, "FILENAME"))
{
strncpy(f->fullname, value, FSPATHLEN + FNAMELEN);
f->fullname[FSPATHLEN + FNAMELEN] = 0;
}
// else if (! strcasecmp(id, "PATH"))
// {
// strncpy(f->path, value, FSPATHLEN);
// f->path[FSPATHLEN] = 0;
// }
else if (! strcasecmp(id, "SIZE")) f->size = atol(value);
else if (! strcasecmp(id, "MD5"))
{
strncpy(md5str, value, 32);
md5str[32] = 0;
}
else if (! strcasecmp(id, "TIME")) f->unixtime = atol(value);
else if (! strcasecmp(id, "BLOCKSIZE")) *rxed_blocksize = atoi(value);
else if (! strcasecmp(id, "VERSION"))
{
strncpy(partner_ver, value, 9);
partner_ver[9] = 0;
}
}
}
/*---------------------------------------------------------------------------*/
void fileio_dida::parse_START (unsigned long int *resume_offset,
char *part_md5str,
unsigned short int *rxed_blocksize)
//*************************************************************************
//
//
//
//*************************************************************************
{
char *block = bl->data, *id, *value;
*resume_offset = 0L;
*part_md5str = 0;
*rxed_blocksize = 0;
*partner_ver = 0;
while ((block = parse_textblock(block, &id, &value)) != NULL)
{
if (! strcasecmp(id, "OFFSET")) *resume_offset = atol(value);
else if (! strcasecmp(id, "PART_MD5"))
{
strncpy(part_md5str, value, 32);
part_md5str[32] = 0;
}
else if (! strcasecmp(id, "BLOCKSIZE")) *rxed_blocksize = atoi(value);
else if (! strcasecmp(id, "VERSION"))
{
strncpy(partner_ver, value, 9);
partner_ver[9] = 0;
}
}
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_INFO()
//*************************************************************************
//
//*************************************************************************
{
#ifdef DEBUG_DIDADIT
trace(serious, "tx_INFO", "s:%s, p:%s, n:%s,", sendname, f->path, f->name);
#endif
// TODO: overrun check
if (! *sendname) strcpy(sendname, f->name);
sprintf(b->line,
"FILENAME=%s\r"
"PATH=%s\r"
"SIZE=%ld\r"
"MD5=%s\r"
"TIME=%ld\r"
"BLOCKSIZE=%d\r"
"VERSION=" DIDADIT_VERSION "\r",
sendname, f->path, f->size, f->md5str,
f->unixtime, DEFAULT_BLOCKSIZE);
tx_block(R_BLOCK_INFO, 0, b->line, strlen(b->line));
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_START (unsigned long int offset, char *part_md5str,
unsigned short int blcksize)
//*************************************************************************
//
//*************************************************************************
{
sprintf(b->line, "OFFSET=%ld\r", offset);
/* dh8ymb: in der Variablen is nur Schrott, daher erstmal weglassen
if (offset > 0)
sprintf(b->line + strlen(b->line), "PART_MD5=%s\r", part_md5str);
*/
if (blcksize)
sprintf(b->line + strlen(b->line), "BLOCKSIZE=%d\r", blcksize);
sprintf(b->line + strlen(b->line), "VERSION=" DIDADIT_VERSION "\r");
tx_block(R_BLOCK_START, 0, b->line, strlen(b->line));
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_ERR (char *errorinfo)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_ERR, 1, b->line, strlen(b->line));
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_DATA (unsigned long int offset,
unsigned short int length, char *data)
//*************************************************************************
//
//*************************************************************************
{
char *datptr = (char *) t_malloc(length + 6, "dida");
memcpy(datptr, &offset, 4);
memcpy(datptr + 4, &length, 2);
memcpy(datptr + 6, data, length);
tx_block(R_BLOCK_DATA, 1, datptr, length + 6);
t_free(datptr);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_REQ (struct REQ_info *REQ, unsigned long int len)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_REQ, 1, (char *) REQ, len * sizeof(struct REQ_info));
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_FIN (char *data)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_FIN, 1, 0, 0);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_FINACK (void)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_FINACK, 1, 0, 0);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_ECHOREQ (void)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_ECHOREQ, 0, 0, 0);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_ECHOREP (void)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_ECHOREP, 0, 0, 0);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::tx_ABORT (void)
//*************************************************************************
//
//*************************************************************************
{
tx_block(R_BLOCK_ABORT, 1, 0, 0);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::update_r_file (char *r_filename, char *md5str,
unsigned long int REQc, struct REQ_info *REQ)
//*************************************************************************
//
//*************************************************************************
{
int fh;
if (! REQc)
{
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "unlinking rfile");
#endif
xunlink(r_filename);
return;
}
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "update rfile: %d REQs", REQc);
#endif
fh = s_open(r_filename, "swb");
// Write the first 32 bytes of the file (the MD5 hex string)
write(fh, md5str, 32);
// Write a LF
write(fh, "\012", 1);
// Read the list of the parts which we are missing due to invalid
// DATA frames during the reception of the first part
write(fh, REQ, REQc*8);
s_close(fh);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::send_file_data (unsigned long int startbyte,
unsigned long int length,
unsigned long int blcksize)
//*************************************************************************
//
//*************************************************************************
{
char *buf = (char *) t_malloc(blcksize, "dida");
unsigned long int rbytes; // Bytes to be read
unsigned long int rnum; // Bytes successfully read
f->pos = startbyte;
lseek(f->handle, f->offset + startbyte, SEEK_SET);
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "start at %d, total len %d", startbyte, length);
#endif
do
{
rbytes = blcksize;
if (rbytes > length) rbytes = length;
if ((rnum = read(f->handle, buf, rbytes)) != 0)
{
tx_DATA(f->pos, (unsigned short) rnum, buf);
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "offset: %ld, len: %ld", f->pos, rnum);
#endif
f->pos += rnum;
length -= rnum;
waitfor(e_ticsfull);
// TODO: Ueberpruefen, ob inzwischen etwas empfangen wurde
}
}
while (length && rnum);
t_free(buf);
}
/*---------------------------------------------------------------------------*/
void fileio_dida::_rx(void)
//*************************************************************************
//
// Empfangen von DIDADIT
//
//*************************************************************************
{
char md5str[33];
unsigned short int rxed_blocksize;
char *data_start = NULL;
long int rxed_offset;
unsigned short int rxed_len; // TODO: Auswerten!
struct REQ_info *REQ = 0;
unsigned long int REQc = 0, c;
char found;
unsigned long int resume_offset;
unsigned long int bps;
time_t startt = ad_time(), rxtime;
char r_filename[FSPATHLEN * 2 + FNAMELEN + 3];
char r_filemd5str[33];
char r_filehandle;
char *cp;
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "in fileio_dida::_rx");
#endif
if (waitforheader)
{
putf(ms(m_filewaiting), "DIDADIT", "");
do
getline(b->line, sizeof(b->line) - 1, 1);
while (! *b->line); // ignore empty lines
if (strcmp(b->line, "#DIDADIT#"))
{
putf(ms(m_filenotstored));
return;
}
}
putf("\n#OK#\n");
putflush();
alloc_blockmem(DEFAULT_BLOCKSIZE); // TODO: 1000 bytes max.?
// We now expect an INFO-frame
rx_block();
if (bl->type != R_BLOCK_INFO)
{
tx_ABORT();
putf("*** Expected INFO-Frame, got 0x%04X.\n", bl->type);
return;
}
parse_INFO(md5str, &rxed_blocksize);
/*
printf("FILENAME: %s\n"
"PATH: %s\n"
"SIZE: %ld\n"
"MD5: %s\n"
"TIME: %ld\n"
"BLOCKSIZE: %d\n"
"VERSION: %s\n",
f->name, f->path, f->size, md5str, f->unixtime, rxed_blocksize,
partner_ver);
*/
if ((cp = strrchr(f->fullname, '/')) != NULL)
strcpy(f->fullname, cp + 1);
if (*f->path && f->path[strlen(f->path) - 1] != '/')
strcat(f->path, "/");
strcpy(r_filename, f->path);
strcat(r_filename, f->fullname);
time_t modtime = f->unixtime;
usefile(r_filename); // this deletes f->unixtime
f->unixtime = modtime;
// usefile (r_filename);
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "p:%s, n:%s, f:%s, s:%ld", f->path, f->name,
f->fullname, f->size);
#endif
strcpy(r_filename, f->fullname);
strcat(r_filename, ".r");
// If the file already exists, we will resume the transfer
if (filetime(f->fullname))
{
// Look for "filename.extension.r": this file contains information
// about missing parts of the file and the MD5 hash (only exists
// if some of the DATA blocks during the reception of the
// first part have been invalid)
if (filetime(r_filename))
{ // Ok, the index file exists: We will read it's contents and
// check if the MD5 hash is still the same
// TODO: Check, if the length of r_filename is valid!
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "found index file");
#endif
REQc = (filesize(r_filename) - 33) / 8;
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "REQc: %d", REQc);
#endif
REQ = (struct REQ_info *) t_malloc(sizeof(struct REQ_info)
* ((REQc / 5) + 1) * 5, "dida");
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "reserved mem for %d REQ_infos",
((REQc / 5) + 1) * 5);
#endif
r_filehandle = s_open(r_filename, "srb");
// Read the first 32 bytes of the file (the MD5 hex string)
read(r_filehandle, r_filemd5str, 32);
// Skip the following LF
lseek(r_filehandle, 1L, SEEK_CUR);
// Read the list of the parts which we are missing due to invalid
// DATA frames during the reception of the first part
read(r_filehandle, REQ, REQc * 8);
s_close(r_filehandle);
}
else
{ // Nope, there's no index file containg information about gaps
// in the part of the while we have already received
// As we don't know the MD5 hash of the complete file we will
// send the MD5 hash of the part already received to the sender
// who will (hopefully) check if we are talking about the same file
// TODO
}
f->size = resume_offset = filesize(f->fullname);
}
else
{
resume_offset = 0;
//*r_filemd5str = 0;
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "no file to resume");
#endif
}
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "\nr_filemd5str: %s\nmd5str: %s",
r_filemd5str, md5str);
#endif
if (! REQ)
REQ = (struct REQ_info *) t_malloc(sizeof(struct REQ_info) * 5, "dida");
if (rxed_blocksize <= MAX_BLOCKSIZE) blocksize = rxed_blocksize;
else blocksize = MAX_BLOCKSIZE;
tx_START(resume_offset, r_filemd5str, blocksize);
putflush();
// TODO: Vor dem ueberschreiben Warnung ausgeben...
f->handle = s_open(f->fullname, "lr+b");
if (resume_offset) lseek(f->handle, resume_offset, SEEK_SET);
alloc_blockmem(MAX_BLOCKSIZE + 6); // TODO
// alloc_blockmem(blocksize+6); // +4 bytes for the offset
// +2 bytes for the blocklength
f->pos = resume_offset;
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "filesize: %d", f->size);
trace(serious, "debug", "resuming at: %d", resume_offset);
#endif
for (;;)
{
rx_block();
waitfor(e_ticsfull);
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "didadit: type:%i", bl->type);
#endif
if (bl->type == R_BLOCK_DATA)
{ // TODO: the memcpy()s only work on Intel-like architectures...
memcpy((void *) &rxed_offset, bl->data, 4);
memcpy((void *) &rxed_len, bl->data+4, 2);
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "didadit: type:%i, offs:%i, len:%i",
bl->type, rxed_offset, rxed_len);
#endif
data_start = bl->data + 6;
}
else if (bl->type == R_BLOCK_FIN)
// If we have received a FIN block, we set rxed_offset to one
// byte after the last byte of the file - the next lines
// will check, if the filepointer also points to this
// position; if it doesn't, one or more blocks are missing at
// the end and we have to send a REQ-block for them
rxed_offset=f->size;
else break;
if (rxed_offset>f->pos)
{
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "didadit: rxed_offset: %i > f->pos: %i",
rxed_offset, f->pos);
#endif
// Grow the buffer for storing REQs by 5 units, if there ist not
// sufficient space left
if (REQc > 0 && ! (REQc % 5))
REQ = (struct REQ_info *) t_realloc(REQ, sizeof(struct REQ_info)
* (REQc + 5));
REQ[REQc].offset = f->pos;
REQ[REQc].len = rxed_offset - f->pos;
REQc++;
do
write(f->handle, "*", 1); // Fill the file with "*" (TODO: improve this)
while (++f->pos < rxed_offset);
update_r_file(r_filename, r_filemd5str, REQc, REQ);
}
else if (rxed_offset < f->pos)
{
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "ignoring data: offset %d, len %d",
rxed_offset, bl->len-6);
#endif
}
if (bl->type == R_BLOCK_FIN) break;
write(f->handle, data_start, bl->len-6);
f->pos += bl->len - 6;
waitfor(e_ticsfull);
}
switch (bl->type)
{
case R_BLOCK_FIN:
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "sending REQ");
#endif
while (REQc) // As long as we don't have received everything correct
{
tx_REQ(REQ, REQc);
putflush();
for (;;)
{
rx_block();
if (bl->type == R_BLOCK_FIN) break;
// TODO handle invalid block type
if (bl->type != R_BLOCK_DATA)
#ifdef DEBUG_DIDADIT // dh8ymb: correct? missing {} ????
trace(serious, "debug", "unknown block");
#endif
// TODO: the memcpy()s only work on Intel-like architectures...
memcpy((void *) &rxed_offset, bl->data, 4);
memcpy((void *) &rxed_len, bl->data+4, 2);
data_start = bl->data + 6;
// Find the block we just received in our REQ list
found = 0;
for (c = 0; c < REQc; c++)
if ( (rxed_offset >= (long) REQ[c].offset)
&& ((rxed_offset + rxed_len) <= (long) (REQ[c].offset + REQ[c].len)))
{
found = 1;
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "found block at %d, len %d in REQs",
rxed_offset, rxed_len);
trace(serious, "debug", "REQ at %d, len %d",
REQ[c].offset, REQ[c].len);
#endif
break;
}
if (found)
{
lseek(f->handle, rxed_offset, SEEK_SET);
write(f->handle, data_start, bl->len-6);
// Look, if this DATA block includes all the bytes we requested
// in a REQ block or it's just a part of one
if (rxed_offset == (long) REQ[c].offset)
{
if (rxed_len == REQ[c].len)
{ // Fine - The received data block exactly fits to one entry in
// our REQ list.
// => We will delete this REQ entry from the list and decrement
// the number of REQs.
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "situation 1");
#endif
REQc--;
memcpy(REQ+c, REQ + REQc, sizeof(struct REQ_info));
}
else
{ // Hmmm - The received data block fits to the beginning of an
// entry in our REQ list; however, it does not cover ALL of the
// data we are missing according to this REQ entry.
// => We only shorten the length of REQ entry.
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "situation 2");
#endif
REQ[c].offset += rxed_len;
REQ[c].len -= rxed_len;
}
}
else
{
if ((rxed_offset + rxed_len) == (long) (REQ[c].offset + REQ[c].len))
{ // Sigh - The received data block covers exactly the end
// of an entry in our REQ list.
// The handling of this situation is not that difficult
// anyway: => We just have to decrease the length of the
// REQ entry
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "situation 3");
#endif
REQ[c].len -= rxed_len;
}
else
{ // Damn! - This situation is weird! The received data block
// fits to an entry in our REQ list; however, it only supplies
// data, which is located in the middle of the block we
// are missing; the easy way would be to ignore the block,
// but the DIDADIT protocol is intended to only transfer
// data, which is really necessary and so we will go the
// difficult way: => We modify the yet existing entry and
// create a new one
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "situation 4");
#endif
// Grow the buffer for storing REQs by 5 units, if there ist not
// sufficient space left
if (REQc > 0 && ! (REQc % 5))
REQ = (struct REQ_info *) t_realloc(REQ, sizeof(struct REQ_info)
* (REQc + 5));
// First, create the new entry:
REQ[REQc].offset = rxed_offset + rxed_len;
REQ[REQc].len = (REQ[c].offset+REQ[c].len) - REQ[REQc].offset;
REQc++;
// Now, modify the existing entry:
REQ[c].len -= (rxed_len + REQ[REQc - 1].len);
}
}
update_r_file(r_filename, r_filemd5str, REQc, REQ);
}
else
{ // OOPS: Block not found in our REQs - TODO: abort transfer
#ifdef DEBUG_DIDADIT
trace(serious, "debug", "NOT found block at %d, len %d in REQs",
rxed_offset, rxed_len);
#endif
}
}
}
s_close(f->handle);
tx_FINACK();
putflush();
rxtime = ad_time() - startt;
if (! rxtime) rxtime = 1L;
bps = f->size / rxtime;
putf("\n");
putf(ms(m_rxok), "DIDADIT", bps << 3);
putflush();
setfiletime(f->fullname, getdostime(f->unixtime));
break;
default:
s_close(f->handle);
tx_ABORT();