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rx: strip padding from last block. closes bug 501.
function old new delta rx_main 876 974 +98 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
80a3418b8c
commit
dc9495df03
102
miscutils/rx.c
102
miscutils/rx.c
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@ -1,15 +1,12 @@
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/* vi: set sw=4 ts=4: */
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/*-------------------------------------------------------------------------
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* Filename: xmodem.c
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/*
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* Copyright: Copyright (C) 2001, Hewlett-Packard Company
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* Author: Christopher Hoover <ch@hpl.hp.com>
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* Description: xmodem functionality for uploading of kernels
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* and the like
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* Created at: Thu Dec 20 01:58:08 PST 2001
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*-----------------------------------------------------------------------*/
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/*
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* xmodem.c: xmodem functionality for uploading of kernels and
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* the like
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*
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* xmodem functionality for uploading of kernels and the like
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*
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* Copyright (C) 2001 Hewlett-Packard Laboratories
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*
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@ -26,6 +23,7 @@
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#define ACK 0x06
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#define NAK 0x15
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#define BS 0x08
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#define PAD 0x1A
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/*
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Cf:
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@ -44,69 +42,93 @@ Cf:
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static int read_byte(unsigned timeout)
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{
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char buf[1];
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unsigned char buf;
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int n;
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alarm(timeout);
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/* NOT safe_read! We want ALRM to interrupt us */
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n = read(read_fd, buf, 1);
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n = read(read_fd, &buf, 1);
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alarm(0);
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if (n == 1)
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return (unsigned char)buf[0];
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return buf;
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return -1;
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}
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static int receive(/*int read_fd, */int file_fd)
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{
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unsigned char blockBuf[1024];
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unsigned blockLength = 0;
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unsigned errors = 0;
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unsigned wantBlockNo = 1;
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unsigned length = 0;
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int do_crc = 1;
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char nak = 'C';
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char reply_char;
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unsigned timeout = TIMEOUT_LONG;
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/* Flush pending input */
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tcflush(read_fd, TCIFLUSH);
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/* Ask for CRC; if we get errors, we will go with checksum */
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full_write(write_fd, &nak, 1);
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reply_char = 'C';
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full_write(write_fd, &reply_char, 1);
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for (;;) {
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int blockBegin;
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int blockNo, blockNoOnesCompl;
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int blockLength;
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int cksum_crc; /* cksum OR crc */
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int cksum_or_crc;
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int expected;
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int i,j;
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int i, j;
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blockBegin = read_byte(timeout);
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if (blockBegin < 0)
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goto timeout;
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/* If last block, remove padding */
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if (blockBegin == EOT) {
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/* Data blocks can be padded with ^Z characters */
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/* This code tries to detect and remove them */
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if (blockLength >= 3
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&& blockBuf[blockLength - 1] == PAD
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&& blockBuf[blockLength - 2] == PAD
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&& blockBuf[blockLength - 3] == PAD
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) {
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while (blockLength
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&& blockBuf[blockLength - 1] == PAD
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) {
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blockLength--;
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}
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}
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}
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/* Write previously received block */
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if (blockLength) {
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errno = 0;
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if (full_write(file_fd, blockBuf, blockLength) != blockLength) {
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bb_perror_msg("can't write to file");
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goto fatal;
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}
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}
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timeout = TIMEOUT;
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nak = NAK;
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reply_char = NAK;
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switch (blockBegin) {
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case SOH:
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case STX:
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break;
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case EOT:
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nak = ACK;
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full_write(write_fd, &nak, 1);
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reply_char = ACK;
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full_write(write_fd, &reply_char, 1);
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return length;
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default:
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goto error;
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}
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/* block no */
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/* Block no */
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blockNo = read_byte(TIMEOUT);
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if (blockNo < 0)
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goto timeout;
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/* block no one's compliment */
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/* Block no, in one's complement form */
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blockNoOnesCompl = read_byte(TIMEOUT);
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if (blockNoOnesCompl < 0)
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goto timeout;
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@ -126,15 +148,15 @@ static int receive(/*int read_fd, */int file_fd)
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}
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if (do_crc) {
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cksum_crc = read_byte(TIMEOUT);
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if (cksum_crc < 0)
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cksum_or_crc = read_byte(TIMEOUT);
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if (cksum_or_crc < 0)
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goto timeout;
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cksum_crc = (cksum_crc << 8) | read_byte(TIMEOUT);
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if (cksum_crc < 0)
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cksum_or_crc = (cksum_or_crc << 8) | read_byte(TIMEOUT);
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if (cksum_or_crc < 0)
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goto timeout;
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} else {
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cksum_crc = read_byte(TIMEOUT);
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if (cksum_crc < 0)
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cksum_or_crc = read_byte(TIMEOUT);
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if (cksum_or_crc < 0)
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goto timeout;
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}
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@ -155,9 +177,9 @@ static int receive(/*int read_fd, */int file_fd)
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expected = expected ^ blockBuf[i] << 8;
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for (j = 0; j < 8; j++) {
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if (expected & 0x8000)
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expected = expected << 1 ^ 0x1021;
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expected = (expected << 1) ^ 0x1021;
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else
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expected = expected << 1;
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expected = (expected << 1);
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}
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}
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expected &= 0xffff;
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@ -166,25 +188,19 @@ static int receive(/*int read_fd, */int file_fd)
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expected += blockBuf[i];
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expected &= 0xff;
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}
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if (cksum_crc != expected) {
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if (cksum_or_crc != expected) {
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bb_error_msg(do_crc ? "crc error, expected 0x%04x, got 0x%04x"
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: "checksum error, expected 0x%02x, got 0x%02x",
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expected, cksum_crc);
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expected, cksum_or_crc);
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goto error;
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}
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wantBlockNo++;
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length += blockLength;
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errno = 0;
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if (full_write(file_fd, blockBuf, blockLength) != blockLength) {
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bb_perror_msg("can't write to file");
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goto fatal;
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}
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next:
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errors = 0;
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nak = ACK;
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full_write(write_fd, &nak, 1);
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reply_char = ACK;
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full_write(write_fd, &reply_char, 1);
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continue;
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error:
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timeout:
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@ -192,9 +208,9 @@ static int receive(/*int read_fd, */int file_fd)
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if (errors == MAXERRORS) {
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/* Abort */
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/* if were asking for crc, try again w/o crc */
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if (nak == 'C') {
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nak = NAK;
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/* If were asking for crc, try again w/o crc */
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if (reply_char == 'C') {
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reply_char = NAK;
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errors = 0;
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do_crc = 0;
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goto timeout;
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@ -209,7 +225,7 @@ static int receive(/*int read_fd, */int file_fd)
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/* Flush pending input */
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tcflush(read_fd, TCIFLUSH);
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full_write(write_fd, &nak, 1);
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full_write(write_fd, &reply_char, 1);
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} /* for (;;) */
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}
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27
testsuite/rx.tests
Normal file
27
testsuite/rx.tests
Normal file
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@ -0,0 +1,27 @@
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#!/bin/sh
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# Copyright 2009 by Denys Vlasenko
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# Licensed under GPL v2, see file LICENSE for details.
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. testing.sh
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# testing "test name" "options" "expected result" "file input" "stdin"
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# Simple one-block file transfer
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# rx => 'C'
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# rx <= SOH <blockno> <255-blockno> <128 byte padded with x1A> <crc> <crc>
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# rx => ACK
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# rx <= EOT
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# rx => ACK
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testing "rx" \
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"rx rx.OUTFILE | hexdump -vC && cat rx.OUTFILE" \
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"\
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00000000 43 06 06 |C..|\n\
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00000003\n\
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???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????" \
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"" "\1\1\376\
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???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????\
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\x1A\x1A\x1A\x1A\x1A\x4B\xB0\4"
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rm -f rx.OUTFILE 2>/dev/null
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exit $FAILCOUNT
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