?? zmodem.c
字號(hào):
unsigned char cData;
if( giComFd != ERROR )
{
if( read( giComFd, &cData, 1 ) == 1 )
{
return( cData );
}
}
else
{
printf( "read com fail " );
return ( 0 );
}
}
/*----------------------------------------------------------------------*/
/* Z GET BYTE */
/* Get a byte from the modem. */
/* return TIMEOUT if no read within timeout tenths, */
/*----------------------------------------------------------------------*/
/* 從modem中獲得一個(gè)字節(jié) */
static char zGetByte( int tenths )
{
gbTimeOut = false;
tenths = tenths / 10;
tickSet( 0 );
while ( tickGet( ) <= tenths )
{
if ( zTestOneByte() )
{
return ( zGetOneByte() );
}
}
gbTimeOut = true;
return ( '\xff' );
}
/*---------------------------------------------------------*/
/* Z TIMED READ */
/* Read a character from the modem line with timeout. */
/* Eat parity, XON and XOFF characters. */
/*---------------------------------------------------------*/
/*從modem中讀取一個(gè)字符with timeout*/
static char zTimedRead( )
{
while( 1 )
{
char cRecChar = zGetByte( 30000 );
if ( gbTimeOut )
{
return ( cRecChar );
}
if ( ( cRecChar & 0x7f ) == XON ) ;
else if ( ( cRecChar & 0x7f ) == XOFF ) ;
else
{
return ( cRecChar );
}
}
}
/*---------------------------------------------------------------------*/
/* Z UPDATE CRC */
/* update CRC */ /*更新CRC*/
/*---------------------------------------------------------------------*/
#ifdef CRCTABLE
/* crctab calculated by Mark G. Mendel, Network Systems Corporation */
static unsigned short int crctab[256] = /*CRC表 */
{
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
#define Z_UpdateCRC(cp, crc) ( crctab[((crc >> 8) & 255)] ^ (crc << 8) ^ cp)
#else
static unsigned short int Z_UpdateCRC(unsigned short int c, unsigned short int crc) /*更新CRC（Z_UpdateCRC）*/
{
int count;
for (count=8; --count>=0; )
{
if (crc & 0x8000)
{
crc <<= 1;
crc += (((c<<=1) & 0400) != 0);
crc ^= 0x1021;
}
else
{
crc <<= 1;
crc += (((c<<=1) & 0400) != 0);
}
}
return crc;
}
#endif
#define SENDBYTE( c ) zSendChar( c )
/* Send a byte as two hex digits */
static char hex[] = "0123456789abcdef";
#define Z_PUTHEX(i,c) { i=(c); SENDBYTE(hex[((i)&0xF0)>>4]); SENDBYTE(hex[(i)&0xF]); }
/*----------------------------------------------------------------------*/
/* Z SEND HEX HEADER */
/* Send ZMODEM HEX header hdr of type type */
/*----------------------------------------------------------------------*/
static void zSendHexHeader( char type, char *pcHdr )
{
int n;
char i;
unsigned short int crc;
SENDBYTE( ZPAD );
SENDBYTE( ZPAD );
SENDBYTE( ZDLE );
SENDBYTE( ZHEX );
Z_PUTHEX( i,type );
crc = Z_UpdateCRC( type, 0 );
for ( n=4; --n >= 0; )
{
Z_PUTHEX( i,( *pcHdr ) );
crc = Z_UpdateCRC( ( ( unsigned short )( *pcHdr++ ) ), crc );
}
crc = Z_UpdateCRC( 0,crc );
crc = Z_UpdateCRC( 0,crc );
Z_PUTHEX( i,( crc>>8 ) );
Z_PUTHEX( i,crc );
/* Make it printable on remote machine */ /*使得在遠(yuǎn)程的機(jī)器上可打印*/
SENDBYTE( '\x0d' );
SENDBYTE( '\x0a' );
/* Uncork the remote in case a fake XOFF has stopped data flow */
if ( type != ZFIN )
{
SENDBYTE( 021 );
}
}
/*---------------------------------------------------------------------*/
/* Z GET ZDL */
/* Read a byte, checking for ZMODEM escape encoding */
/* including CAN*5 which represents a quick abort */
/* 0x10,0x11,0x13,0x90,0x91,0x93 & 0x18 is special treatment */
/*---------------------------------------------------------------------*/
static int zGetZDL(void)
{
int iRecChar;
iRecChar = zGetByte( 1000 );
if ( gbTimeOut )
{
return ( ZZTIMEOUT );
}
if ( iRecChar != ZDLE )
{
return ( iRecChar );
}
iRecChar = zGetByte( 1000 );
if ( gbTimeOut )
{
return ( ZZTIMEOUT );
}
switch ( iRecChar )
{
case CAN:
iRecChar = zGetByte( 1000 );
if ( gbTimeOut )
{
return ( ZZTIMEOUT );
}
if ( iRecChar != CAN )
{
return ( iRecChar );
}
iRecChar = zGetByte( 1000 );
if ( gbTimeOut )
{
return ( ZZTIMEOUT );
}
if ( iRecChar != CAN )
{
return ( iRecChar );
}
iRecChar = zGetByte( 1000 );
if ( gbTimeOut )
{
return ( ZZTIMEOUT );
}
if ( iRecChar != CAN )
{
return ( iRecChar );
}
return ( GOTCAN );
case ZCRCE:
case ZCRCG:
case ZCRCQ:
case ZCRCW: return ( iRecChar | GOTOR );
case ZRUB0: return ( 0x7F );
case ZRUB1: return ( 0xFF );
default:
if ( ( iRecChar & 0x60 ) == 0x40 )
{
return ( iRecChar ^ 0x40 );
}
else
{
return ( ZZERROR );
}
}
}
/*-----------------------------------------------------*/
/* Z GET BINARY HEADER */
/* Receive a binary style header (type and position) */
/*-----------------------------------------------------*/
/*接受一個(gè)二進(jìn)制的style header（類型和位置）*/
static char zGetBinaryHeader( char *pcHdr )
{
int iRecChar, iHdrBits;
unsigned short int usCrc;
if ( ( iRecChar = zGetZDL( ) ) & ~0xFF )
{
return ( iRecChar );
}
giRxType = iRecChar;
usCrc = Z_UpdateCRC( iRecChar, 0 );
for ( iHdrBits = 4; --iHdrBits >= 0; )
{
if ( ( iRecChar = zGetZDL( ) ) & ~0xFF )
{
return ( iRecChar );
}
usCrc = Z_UpdateCRC( iRecChar, usCrc );
*pcHdr++ = iRecChar;
}
if ( ( iRecChar = zGetZDL( ) ) & ~0xFF )
{
return ( iRecChar );
}
usCrc = Z_UpdateCRC( iRecChar, usCrc );
if ( ( iRecChar = zGetZDL( ) ) & ~0xFF )
{
return ( iRecChar );
}
usCrc = Z_UpdateCRC( iRecChar, usCrc );
if ( crc & 0xFFFF ) /*CRC全零表示校驗(yàn)正確*/
{
return ( ZZERROR ); /*CRC error*/
}
return ( giRxType );
}
/*/*-----------------------------------------------------------------------*/
/*/* Z GET HEX */
/*/* Decode two lower case hex digits into an 8 bit byte value */
/*/*-----------------------------------------------------------------------*/
static int zGetHex( void )
{
int iCharHigh,iCharLow;
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