Google上淘的一个ymodem的c实现
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//http://code.google.com/p/xtreamerdev/source/browse/trunk/rtdsr/?r=2#rtdsr%253Fstate%253Dclosed/* ymodem for RTD Serial Recovery (rtdsr) * * copyright (c) 2011 Pete B. <xtreamerdev@gmail.com> * * based on ymodem.h for bootldr, copyright (c) 2001 John G Dorsey * * 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 3 of * the License, or (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. * */#if !defined(_YMODEM_H)#define _YMODEM_H#define PACKET_SEQNO_INDEX (1)#define PACKET_SEQNO_COMP_INDEX (2)#define PACKET_HEADER (3) /* start, block, block-complement */#define PACKET_TRAILER (2) /* CRC bytes */#define PACKET_OVERHEAD (PACKET_HEADER + PACKET_TRAILER)#define PACKET_SIZE (128)#define PACKET_1K_SIZE (1024)#define PACKET_TIMEOUT (1)#define INITIAL#define FILE_NAME_LENGTH (64)#define FILE_SIZE_LENGTH (16)/* ASCII control codes: */#define SOH (0x01) /* start of 128-byte data packet */#define STX (0x02) /* start of 1024-byte data packet */#define EOT (0x04) /* end of transmission */#define ACK (0x06) /* receive OK */#define NAK (0x15) /* receiver error; retry */#define CAN (0x18) /* two of these in succession aborts transfer */#define CRC (0x43) /* use in place of first NAK for CRC mode *//* Number of consecutive receive errors before giving up: */#define MAX_ERRORS (5)extern unsigned long ymodem_receive(unsigned char *buf, unsigned long length);extern unsigned long ymodem_send(unsigned char *buf, unsigned long size, char* filename);#endif /* !define(_YMODEM_H) *//* ymodem for RTD Serial Recovery (rtdsr) * * copyright (c) 2011 Pete B. <xtreamerdev@gmail.com> * * based on ymodem.c for bootldr, copyright (c) 2001 John G Dorsey * baded on ymodem.c for reimage, copyright (c) 2009 Rich M Legrand * crc16 function from PIC CRC16, by Ashley Roll & Scott Dattalo * crc32 function from crc32.c by Craig Bruce * * 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 3 of * the License, or (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. * *//* * These Ymodem calls are aimed at embedded software and tailored to * work against Microsoft's HyperTerminal. Some of the Ymodem protocol* operations have been voluntarily left out. * * To be able to use these functions, you must provide: * o int _getchar(int timeout): A serial getchar() call, with a * timeout expressed in seconds. Negative means infinite timeout. * returns a character as an int, or negative on error/timeout. * o void _putchar(int c): A serial putchar() call */#include "util.h"#include "printf.h"#include "ymodem.h"#define WITH_CRC32#ifdef WITH_CRC32/* http://csbruce.com/~csbruce/software/crc32.c */unsigned long crc32(const unsigned char* buf, unsigned long count){ unsigned long crc = 0xFFFFFFFF; unsigned long i; /* This static table adds 1K */ static const unsigned long crc_table[256] = { 0x00000000,0x77073096,0xEE0E612C,0x990951BA,0x076DC419,0x706AF48F,0xE963A535, 0x9E6495A3,0x0EDB8832,0x79DCB8A4,0xE0D5E91E,0x97D2D988,0x09B64C2B,0x7EB17CBD, 0xE7B82D07,0x90BF1D91,0x1DB71064,0x6AB020F2,0xF3B97148,0x84BE41DE,0x1ADAD47D, 0x6DDDE4EB,0xF4D4B551,0x83D385C7,0x136C9856,0x646BA8C0,0xFD62F97A,0x8A65C9EC, 0x14015C4F,0x63066CD9,0xFA0F3D63,0x8D080DF5,0x3B6E20C8,0x4C69105E,0xD56041E4, 0xA2677172,0x3C03E4D1,0x4B04D447,0xD20D85FD,0xA50AB56B,0x35B5A8FA,0x42B2986C, 0xDBBBC9D6,0xACBCF940,0x32D86CE3,0x45DF5C75,0xDCD60DCF,0xABD13D59,0x26D930AC, 0x51DE003A,0xC8D75180,0xBFD06116,0x21B4F4B5,0x56B3C423,0xCFBA9599,0xB8BDA50F, 0x2802B89E,0x5F058808,0xC60CD9B2,0xB10BE924,0x2F6F7C87,0x58684C11,0xC1611DAB, 0xB6662D3D,0x76DC4190,0x01DB7106,0x98D220BC,0xEFD5102A,0x71B18589,0x06B6B51F, 0x9FBFE4A5,0xE8B8D433,0x7807C9A2,0x0F00F934,0x9609A88E,0xE10E9818,0x7F6A0DBB, 0x086D3D2D,0x91646C97,0xE6635C01,0x6B6B51F4,0x1C6C6162,0x856530D8,0xF262004E, 0x6C0695ED,0x1B01A57B,0x8208F4C1,0xF50FC457,0x65B0D9C6,0x12B7E950,0x8BBEB8EA, 0xFCB9887C,0x62DD1DDF,0x15DA2D49,0x8CD37CF3,0xFBD44C65,0x4DB26158,0x3AB551CE, 0xA3BC0074,0xD4BB30E2,0x4ADFA541,0x3DD895D7,0xA4D1C46D,0xD3D6F4FB,0x4369E96A, 0x346ED9FC,0xAD678846,0xDA60B8D0,0x44042D73,0x33031DE5,0xAA0A4C5F,0xDD0D7CC9, 0x5005713C,0x270241AA,0xBE0B1010,0xC90C2086,0x5768B525,0x206F85B3,0xB966D409, 0xCE61E49F,0x5EDEF90E,0x29D9C998,0xB0D09822,0xC7D7A8B4,0x59B33D17,0x2EB40D81, 0xB7BD5C3B,0xC0BA6CAD,0xEDB88320,0x9ABFB3B6,0x03B6E20C,0x74B1D29A,0xEAD54739, 0x9DD277AF,0x04DB2615,0x73DC1683,0xE3630B12,0x94643B84,0x0D6D6A3E,0x7A6A5AA8, 0xE40ECF0B,0x9309FF9D,0x0A00AE27,0x7D079EB1,0xF00F9344,0x8708A3D2,0x1E01F268, 0x6906C2FE,0xF762575D,0x806567CB,0x196C3671,0x6E6B06E7,0xFED41B76,0x89D32BE0, 0x10DA7A5A,0x67DD4ACC,0xF9B9DF6F,0x8EBEEFF9,0x17B7BE43,0x60B08ED5,0xD6D6A3E8, 0xA1D1937E,0x38D8C2C4,0x4FDFF252,0xD1BB67F1,0xA6BC5767,0x3FB506DD,0x48B2364B, 0xD80D2BDA,0xAF0A1B4C,0x36034AF6,0x41047A60,0xDF60EFC3,0xA867DF55,0x316E8EEF, 0x4669BE79,0xCB61B38C,0xBC66831A,0x256FD2A0,0x5268E236,0xCC0C7795,0xBB0B4703, 0x220216B9,0x5505262F,0xC5BA3BBE,0xB2BD0B28,0x2BB45A92,0x5CB36A04,0xC2D7FFA7, 0xB5D0CF31,0x2CD99E8B,0x5BDEAE1D,0x9B64C2B0,0xEC63F226,0x756AA39C,0x026D930A, 0x9C0906A9,0xEB0E363F,0x72076785,0x05005713,0x95BF4A82,0xE2B87A14,0x7BB12BAE, 0x0CB61B38,0x92D28E9B,0xE5D5BE0D,0x7CDCEFB7,0x0BDBDF21,0x86D3D2D4,0xF1D4E242, 0x68DDB3F8,0x1FDA836E,0x81BE16CD,0xF6B9265B,0x6FB077E1,0x18B74777,0x88085AE6, 0xFF0F6A70,0x66063BCA,0x11010B5C,0x8F659EFF,0xF862AE69,0x616BFFD3,0x166CCF45, 0xA00AE278,0xD70DD2EE,0x4E048354,0x3903B3C2,0xA7672661,0xD06016F7,0x4969474D, 0x3E6E77DB,0xAED16A4A,0xD9D65ADC,0x40DF0B66,0x37D83BF0,0xA9BCAE53,0xDEBB9EC5, 0x47B2CF7F,0x30B5FFE9,0xBDBDF21C,0xCABAC28A,0x53B39330,0x24B4A3A6,0xBAD03605, 0xCDD70693,0x54DE5729,0x23D967BF,0xB3667A2E,0xC4614AB8,0x5D681B02,0x2A6F2B94, 0xB40BBE37,0xC30C8EA1,0x5A05DF1B,0x2D02EF8D }; for (i=0; i<count; i++) { crc = (crc >> 8) ^ crc_table[(crc ^ buf[i]) & 0xFF]; } return(crc ^ 0xFFFFFFFF);}#endif/* http://www.ccsinfo.com/forum/viewtopic.php?t=24977 */unsigned short crc16(const unsigned char *buf, unsigned long count){ unsigned short crc = 0; int i; while(count--) { crc = crc ^ *buf++ << 8; for (i=0; i<8; i++) { if (crc & 0x8000) { crc = crc << 1 ^ 0x1021; } else { crc = crc << 1; } } } return crc;}static const char *u32_to_str(unsigned int val){ /* Maximum number of decimal digits in u32 is 10 */ static char num_str[11]; int pos = 10; num_str[10] = 0; if (val == 0) { /* If already zero then just return zero */ return "0"; } while ((val != 0) && (pos > 0)) { num_str[--pos] = (val % 10) + '0'; val /= 10; } return &num_str[pos];}static unsigned long str_to_u32(char* str){ const char *s = str; unsigned long acc; int c; /* strip leading spaces if any */ do { c = *s++; } while (c == ' '); for (acc = 0; (c >= '0') && (c <= '9'); c = *s++) { c -= '0'; acc *= 10; acc += c; } return acc;}/* Returns 0 on success, 1 on corrupt packet, -1 on error (timeout): */static int receive_packet(char *data, int *length){ int i, c; unsigned int packet_size; *length = 0; c = _getchar(PACKET_TIMEOUT); if (c < 0) { return -1; } switch(c) { case SOH: packet_size = PACKET_SIZE; break; case STX: packet_size = PACKET_1K_SIZE; break; case EOT: return 0; case CAN: c = _getchar(PACKET_TIMEOUT); if (c == CAN) { *length = -1; return 0; } default: /* This case could be the result of corruption on the first octet * of the packet, but it's more likely that it's the user banging * on the terminal trying to abort a transfer. Technically, the * former case deserves a NAK, but for now we'll just treat this * as an abort case. */ *length = -1; return 0; } *data = (char)c; for(i = 1; i < (packet_size + PACKET_OVERHEAD); ++i) { c = _getchar(PACKET_TIMEOUT); if (c < 0) { return -1; } data[i] = (char)c; } /* Just a sanity check on the sequence number/complement value. * Caller should check for in-order arrival. */ if (data[PACKET_SEQNO_INDEX] != ((data[PACKET_SEQNO_COMP_INDEX] ^ 0xff) & 0xff)) { return 1; } if (crc16(data + PACKET_HEADER, packet_size + PACKET_TRAILER) != 0) { return 1; } *length = packet_size; return 0;}/* Returns the length of the file received, or 0 on error: */unsigned long ymodem_receive(unsigned char *buf, unsigned long length){ unsigned char packet_data[PACKET_1K_SIZE + PACKET_OVERHEAD]; int packet_length, i, file_done, session_done, crc_tries, crc_nak; unsigned int packets_received, errors, first_try = 1; char file_name[FILE_NAME_LENGTH], file_size[FILE_SIZE_LENGTH], *file_ptr; unsigned char *buf_ptr; unsigned long size = 0; printf("Ymodem rcv:\n"); file_name[0] = 0; for (session_done = 0, errors = 0; ; ) { crc_tries = crc_nak = 1; if (!first_try) { _putchar(CRC); } first_try = 0; for (packets_received = 0, file_done = 0, buf_ptr = buf; ; ) { switch (receive_packet(packet_data, &packet_length)) { case 0: errors = 0; switch (packet_length) { case -1: /* abort */ _putchar(ACK); return 0; case 0: /* end of transmission */ _putchar(ACK); /* Should add some sort of sanity check on the number of * packets received and the advertised file length. */ file_done = 1; break; default: /* normal packet */ if ((packet_data[PACKET_SEQNO_INDEX] & 0xff) != (packets_received & 0xff)) { _putchar(NAK); } else { if (packets_received == 0) { /* The spec suggests that the whole data section should * be zeroed, but I don't think all senders do this. If * we have a NULL filename and the first few digits of * the file length are zero, we'll call it empty. */ for (i = PACKET_HEADER; i < PACKET_HEADER + 4; i++) { if (packet_data[i] != 0) { break; } } if (i < PACKET_HEADER + 4) { /* filename packet has data */ for (file_ptr = packet_data + PACKET_HEADER, i = 0; *file_ptr && i < FILE_NAME_LENGTH; ) { file_name[i++] = *file_ptr++; } file_name[i++] = '\0'; for (++file_ptr, i = 0; *file_ptr != ' ' && i < FILE_SIZE_LENGTH; ) { file_size[i++] = *file_ptr++; } file_size[i++] = '\0'; size = str_to_u32(file_size); if (size > length) { _putchar(CAN); _putchar(CAN); _sleep(1); printf("\nrcv buffer too small (0x%08x vs 0x%08x)\n", length, size); return 0; } _putchar(ACK); _putchar(crc_nak ? CRC : NAK); crc_nak = 0; } else { /* filename packet is empty; end session */ _putchar(ACK); file_done = 1; session_done = 1; break; } } else { /* This shouldn't happen, but we check anyway in case the * sender lied in its filename packet: */ if ((buf_ptr + packet_length) - buf > length) { _putchar(CAN); _putchar(CAN); _sleep(1); printf("\nbuffer overflow: %d\n", length); return 0; } for (i=0; i<packet_length; i++) { buf_ptr[i] = packet_data[PACKET_HEADER+i]; } buf_ptr += packet_length; _putchar(ACK); } ++packets_received; } /* sequence number ok */ } break; default: if (packets_received != 0) { if (++errors >= MAX_ERRORS) { _putchar(CAN); _putchar(CAN); _sleep(1); printf("\ntoo many errors - aborted.\n"); return 0; } } _putchar(CRC); } if (file_done) { break; } } /* receive packets */ if (session_done) break; } /* receive files */ printf("\n"); if (size > 0) { printf("read:%s\n", file_name);#ifdef WITH_CRC32 printf("crc32:0x%08x, len:0x%08x\n", crc32(buf, size), size);#else printf("len:0x%08x\n", size);#endif } return size;}static void send_packet(unsigned char *data, int block_no){ int count, crc, packet_size; /* We use a short packet for block 0 - all others are 1K */ if (block_no == 0) { packet_size = PACKET_SIZE; } else { packet_size = PACKET_1K_SIZE; } crc = crc16(data, packet_size); /* 128 byte packets use SOH, 1K use STX */ _putchar((block_no==0)?SOH:STX); _putchar(block_no & 0xFF); _putchar(~block_no & 0xFF); for (count=0; count<packet_size; count++) { _putchar(data[count]); } _putchar((crc >> 8) & 0xFF); _putchar(crc & 0xFF);}/* Send block 0 (the filename block). filename might be truncated to fit. */static void send_packet0(char* filename, unsigned long size){ unsigned long count = 0; unsigned char block[PACKET_SIZE]; const char* num; if (filename) { while (*filename && (count < PACKET_SIZE-FILE_SIZE_LENGTH-2)) { block[count++] = *filename++; } block[count++] = 0; num = u32_to_str(size); while(*num) { block[count++] = *num++; } } while (count < PACKET_SIZE) { block[count++] = 0; } send_packet(block, 0);}static void send_data_packets(unsigned char* data, unsigned long size){ int blockno = 1; unsigned long send_size; int ch; while (size > 0) { if (size > PACKET_1K_SIZE) { send_size = PACKET_1K_SIZE; } else { send_size = size; } send_packet(data, blockno); ch = _getchar(PACKET_TIMEOUT); if (ch == ACK) { blockno++; data += send_size; size -= send_size; } else { if((ch == CAN) || (ch == -1)) { return; } } } do { _putchar(EOT); ch = _getchar(PACKET_TIMEOUT); } while((ch != ACK) && (ch != -1)); /* Send last data packet */ if (ch == ACK) { ch = _getchar(PACKET_TIMEOUT); if (ch == CRC) { do { send_packet0(0, 0); ch = _getchar(PACKET_TIMEOUT); } while((ch != ACK) && (ch != -1)); } }}unsigned long ymodem_send(unsigned char* buf, unsigned long size, char* filename){ int ch, crc_nak = 1; printf("Ymodem send:\n"); /* Flush the RX FIFO, after a cool off delay */ _sleep(1); while (serial_read() >= 0); /* Not in the specs, just for balance */ do { _putchar(CRC); ch = _getchar(1); } while (ch < 0); if (ch == CRC) { do { send_packet0(filename, size); /* When the receiving program receives this block and successfully * opened the output file, it shall acknowledge this block with an ACK * character and then proceed with a normal XMODEM file transfer * beginning with a "C" or NAK tranmsitted by the receiver. */ ch = _getchar(PACKET_TIMEOUT); if (ch == ACK) { ch = _getchar(PACKET_TIMEOUT); if (ch == CRC) { send_data_packets(buf, size); printf("\nsent:%s\n", filename);#ifdef WITH_CRC32 printf("crc32:0x%08x, len:0x%08x\n", crc32(buf, size), size);#else printf("len:0x%08x\n", size);#endif return size; } } else if ((ch == CRC) && (crc_nak)) { crc_nak = 0; continue; } else if ((ch != NAK) || (crc_nak)) { break; } } while(1); } _putchar(CAN); _putchar(CAN); _sleep(1); printf("\naborted.\n"); return 0;}Hide detailsChange logr2 by xtreamerdev on Jan 17, 2011 Diffv0.3: initial commitGo to: Older revisionsAll revisions of this fileFile infoSize: 14482 bytes, 496 linesView raw file 0 0
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