|
1 // Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies). |
|
2 // All rights reserved. |
|
3 // This component and the accompanying materials are made available |
|
4 // under the terms of the License "Eclipse Public License v1.0" |
|
5 // which accompanies this distribution, and is available |
|
6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
7 // |
|
8 // Initial Contributors: |
|
9 // Nokia Corporation - initial contribution. |
|
10 // |
|
11 // Contributors: |
|
12 // |
|
13 // Description: |
|
14 // e32test\misc\ymodem.cpp |
|
15 // |
|
16 // |
|
17 |
|
18 #include <e32cmn.h> |
|
19 #include <e32cmn_private.h> |
|
20 #include "ymodem.h" |
|
21 |
|
22 //#include <e32test.h> |
|
23 //GLREF_D RTest test; |
|
24 |
|
25 const TInt KMaxRetries=10; |
|
26 |
|
27 static const TUint16 crcTab[256] = |
|
28 { |
|
29 0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7,0x8108,0x9129,0xa14a, |
|
30 0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef,0x1231,0x0210,0x3273,0x2252,0x52b5,0x4294, |
|
31 0x72f7,0x62d6,0x9339,0x8318,0xb37b,0xa35a,0xd3bd,0xc39c,0xf3ff,0xe3de,0x2462, |
|
32 0x3443,0x0420,0x1401,0x64e6,0x74c7,0x44a4,0x5485,0xa56a,0xb54b,0x8528,0x9509, |
|
33 0xe5ee,0xf5cf,0xc5ac,0xd58d,0x3653,0x2672,0x1611,0x0630,0x76d7,0x66f6,0x5695, |
|
34 0x46b4,0xb75b,0xa77a,0x9719,0x8738,0xf7df,0xe7fe,0xd79d,0xc7bc,0x48c4,0x58e5, |
|
35 0x6886,0x78a7,0x0840,0x1861,0x2802,0x3823,0xc9cc,0xd9ed,0xe98e,0xf9af,0x8948, |
|
36 0x9969,0xa90a,0xb92b,0x5af5,0x4ad4,0x7ab7,0x6a96,0x1a71,0x0a50,0x3a33,0x2a12, |
|
37 0xdbfd,0xcbdc,0xfbbf,0xeb9e,0x9b79,0x8b58,0xbb3b,0xab1a,0x6ca6,0x7c87,0x4ce4, |
|
38 0x5cc5,0x2c22,0x3c03,0x0c60,0x1c41,0xedae,0xfd8f,0xcdec,0xddcd,0xad2a,0xbd0b, |
|
39 0x8d68,0x9d49,0x7e97,0x6eb6,0x5ed5,0x4ef4,0x3e13,0x2e32,0x1e51,0x0e70,0xff9f, |
|
40 0xefbe,0xdfdd,0xcffc,0xbf1b,0xaf3a,0x9f59,0x8f78,0x9188,0x81a9,0xb1ca,0xa1eb, |
|
41 0xd10c,0xc12d,0xf14e,0xe16f,0x1080,0x00a1,0x30c2,0x20e3,0x5004,0x4025,0x7046, |
|
42 0x6067,0x83b9,0x9398,0xa3fb,0xb3da,0xc33d,0xd31c,0xe37f,0xf35e,0x02b1,0x1290, |
|
43 0x22f3,0x32d2,0x4235,0x5214,0x6277,0x7256,0xb5ea,0xa5cb,0x95a8,0x8589,0xf56e, |
|
44 0xe54f,0xd52c,0xc50d,0x34e2,0x24c3,0x14a0,0x0481,0x7466,0x6447,0x5424,0x4405, |
|
45 0xa7db,0xb7fa,0x8799,0x97b8,0xe75f,0xf77e,0xc71d,0xd73c,0x26d3,0x36f2,0x0691, |
|
46 0x16b0,0x6657,0x7676,0x4615,0x5634,0xd94c,0xc96d,0xf90e,0xe92f,0x99c8,0x89e9, |
|
47 0xb98a,0xa9ab,0x5844,0x4865,0x7806,0x6827,0x18c0,0x08e1,0x3882,0x28a3,0xcb7d, |
|
48 0xdb5c,0xeb3f,0xfb1e,0x8bf9,0x9bd8,0xabbb,0xbb9a,0x4a75,0x5a54,0x6a37,0x7a16, |
|
49 0x0af1,0x1ad0,0x2ab3,0x3a92,0xfd2e,0xed0f,0xdd6c,0xcd4d,0xbdaa,0xad8b,0x9de8, |
|
50 0x8dc9,0x7c26,0x6c07,0x5c64,0x4c45,0x3ca2,0x2c83,0x1ce0,0x0cc1,0xef1f,0xff3e, |
|
51 0xcf5d,0xdf7c,0xaf9b,0xbfba,0x8fd9,0x9ff8,0x6e17,0x7e36,0x4e55,0x5e74,0x2e93, |
|
52 0x3eb2,0x0ed1,0x1ef0 |
|
53 }; |
|
54 |
|
55 YModem::YModem(TBool aG) |
|
56 { |
|
57 iTimeout=2000000; |
|
58 iPacketSize=0; |
|
59 iInitChar=aG?BIGG:BIGC; |
|
60 } |
|
61 |
|
62 void YModem::UpdateCrc(const TUint8* aPtr, TInt aLength) |
|
63 // |
|
64 // Perform a CCITT CRC checksum. |
|
65 // |
|
66 { |
|
67 |
|
68 register const TUint8* pB=aPtr; |
|
69 register TUint16 crc=iCrc; |
|
70 while (aLength--) |
|
71 crc=TUint16((crc<<8)^crcTab[(crc>>8)^*pB++]); |
|
72 iCrc=crc; |
|
73 } |
|
74 |
|
75 TInt YModem::ReadPacket(TDes8& aDest) |
|
76 { |
|
77 TUint8* pD = (TUint8*)aDest.Ptr(); |
|
78 TInt r; |
|
79 TPtr8 d(pD, 0, 1); |
|
80 r = ReadBlock(d); |
|
81 if (r != KErrNone) |
|
82 return r; |
|
83 if (d.Length()==0) |
|
84 return KErrZeroLengthPacket; |
|
85 TUint8 b0 = *pD; |
|
86 if (b0==CAN) |
|
87 return KErrAbort; |
|
88 if (b0==EOT) |
|
89 return KErrEof; |
|
90 if (b0==SOH) |
|
91 iBlockSize=128; |
|
92 else if (b0==STX) |
|
93 iBlockSize=1024; |
|
94 else |
|
95 return KErrBadPacketType; |
|
96 iTimeout=5000000; |
|
97 iPacketSize = iBlockSize+5; |
|
98 d.Set(pD+1, 0, iPacketSize-1); |
|
99 r = ReadBlock(d); |
|
100 if (r!=KErrNone && r!=KErrTimedOut) |
|
101 return r; |
|
102 if (d.Length() < iPacketSize-1) |
|
103 return KErrPacketTooShort; |
|
104 TUint8 seq = pD[1]; |
|
105 TUint8 seqbar = pD[2]; |
|
106 seqbar^=seq; |
|
107 if (seqbar != 0xff) |
|
108 return KErrCorruptSequenceNumber; |
|
109 if (seq==iSeqNum) |
|
110 return KErrAlreadyExists; |
|
111 else |
|
112 { |
|
113 TUint8 nextseq=(TUint8)(iSeqNum+1); |
|
114 if (seq!=nextseq) |
|
115 return KErrWrongSequenceNumber; |
|
116 } |
|
117 iCrc=0; |
|
118 UpdateCrc(pD+3, iBlockSize); |
|
119 aDest.SetLength(iPacketSize); |
|
120 TUint16 rx_crc = (TUint16)((pD[iPacketSize-2]<<8) | pD[iPacketSize-1]); |
|
121 if (rx_crc != iCrc) |
|
122 return KErrBadCrc; |
|
123 ++iSeqNum; |
|
124 return KErrNone; |
|
125 } |
|
126 |
|
127 TInt YModem::CheckPacket(TUint8* aDest) |
|
128 { |
|
129 const TUint8* p=iPacketBuf.Ptr()+3; |
|
130 if (iState>0) |
|
131 memcpy(aDest, p, iBlockSize); |
|
132 else |
|
133 { |
|
134 // parse packet 0 |
|
135 TPtrC8 nameptr(p); |
|
136 TInt nLen=nameptr.Length(); |
|
137 if (nLen==0) |
|
138 return KErrSessionClosed; // batch termination packet |
|
139 iFileName.Copy(nameptr.Left(Min(nLen,iFileName.MaxLength()))); |
|
140 p+=nLen+1; |
|
141 iFileSize=0; |
|
142 for (;;) |
|
143 { |
|
144 TUint c=*p++; |
|
145 if (c<'0' || c>'9') |
|
146 break; |
|
147 iFileSize*=10; |
|
148 iFileSize+=c-'0'; |
|
149 } |
|
150 // test.Printf(_L("File %S, size %d\n"),&iFileName,iFileSize); |
|
151 } |
|
152 return KErrNone; |
|
153 } |
|
154 |
|
155 TInt YModem::ReadPackets(TUint8*& aDest, TInt aLength) |
|
156 { |
|
157 TInt l=0; |
|
158 TInt r=KErrNone; |
|
159 while(l<aLength || iState==0) |
|
160 { |
|
161 TInt retries=0; |
|
162 for(retries=0; retries<KMaxRetries; retries++) |
|
163 { |
|
164 if (iState==0) |
|
165 iTimeout=2000000, WriteC(iInitChar); |
|
166 r=ReadPacket(iPacketBuf); |
|
167 // test.Printf(_L("%d\n"),r); |
|
168 if (r==KErrTimedOut) |
|
169 continue; |
|
170 if (r==KErrNone) |
|
171 r=CheckPacket(aDest); |
|
172 if (r==KErrEof || r==KErrSessionClosed) |
|
173 break; |
|
174 if (r==KErrNone || r==KErrAlreadyExists) |
|
175 { |
|
176 if (r==KErrNone) |
|
177 iState++; |
|
178 if (iState>1) |
|
179 aDest+=iBlockSize; // don't store packet 0 |
|
180 if (iInitChar==BIGC) |
|
181 WriteC(ACK); |
|
182 if (iState==1) |
|
183 WriteC(iInitChar); // Send another 'C' after ACK |
|
184 if (r==KErrAlreadyExists) |
|
185 continue; |
|
186 break; |
|
187 } |
|
188 if (r==KErrAbort) |
|
189 break; |
|
190 if (iInitChar==BIGG) |
|
191 break; |
|
192 WriteC(NAK); |
|
193 } |
|
194 if (r==KErrNone) |
|
195 { |
|
196 if (iState>1) |
|
197 l+=iBlockSize; |
|
198 } |
|
199 else if (r==KErrSessionClosed) |
|
200 { |
|
201 if (iInitChar==BIGC) |
|
202 WriteC(ACK); |
|
203 break; |
|
204 } |
|
205 else if (r==KErrEof) |
|
206 { |
|
207 WriteC(ACK); // acknowledge end |
|
208 break; |
|
209 } |
|
210 else if (r!=KErrAbort) |
|
211 { |
|
212 WriteC(CAN); |
|
213 WriteC(CAN); |
|
214 WriteC(CAN); |
|
215 WriteC(CAN); |
|
216 WriteC(CAN); |
|
217 break; |
|
218 } |
|
219 } |
|
220 return r; |
|
221 } |
|
222 |
|
223 TInt YModem::StartDownload(TBool aG, TInt& aLength, TDes& aName) |
|
224 { |
|
225 TInt r; |
|
226 iInitChar=aG?BIGG:BIGC; |
|
227 iState=0; |
|
228 iSeqNum=255; |
|
229 TUint8* dummy=NULL; |
|
230 r=ReadPackets(dummy, 0); // read the file description packet |
|
231 if (r==KErrNone) |
|
232 { |
|
233 aLength=iFileSize; // return file name and file size |
|
234 aName=iFileName; |
|
235 } |
|
236 return r; |
|
237 } |
|
238 |