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/*
* Part of Very Secure FTPd
* Licence: GPL v2
* Author: Chris Evans
* ascii.c
*
* Routines to handle ASCII mode tranfers. Yuk.
*/
#include "ascii.h"
struct ascii_to_bin_ret
vsf_ascii_ascii_to_bin(char* p_buf, unsigned int in_len, int prev_cr)
{
/* Task: translate all \r\n into plain \n. A plain \r not followed by \n must
* not be removed.
*/
struct ascii_to_bin_ret ret;
unsigned int indexx = 0;
unsigned int written = 0;
char* p_out = p_buf + 1;
ret.last_was_cr = 0;
if (prev_cr && (!in_len || p_out[0] != '\n'))
{
p_buf[0] = '\r';
ret.p_buf = p_buf;
written++;
}
else
{
ret.p_buf = p_out;
}
while (indexx < in_len)
{
char the_char = p_buf[indexx + 1];
if (the_char != '\r')
{
*p_out++ = the_char;
written++;
}
else if (indexx == in_len - 1)
{
ret.last_was_cr = 1;
}
else if (p_buf[indexx + 2] != '\n')
{
*p_out++ = the_char;
written++;
}
indexx++;
}
ret.stored = written;
return ret;
}
struct bin_to_ascii_ret
vsf_ascii_bin_to_ascii(const char* p_in,
char* p_out,
unsigned int in_len,
int prev_cr)
{
/* Task: translate all \n not preceeded by \r into \r\n.
* Note that \r\n stays as \r\n. We used to map it to \r\r\n like wu-ftpd
* but have switched to leaving it, like the more popular proftpd.
*/
struct bin_to_ascii_ret ret = { 0, 0 };
unsigned int indexx = 0;
unsigned int written = 0;
char last_char = 0;
if (prev_cr)
{
last_char = '\r';
ret.last_was_cr = 1;
}
while (indexx < in_len)
{
char the_char = p_in[indexx];
if (the_char == '\n' && last_char != '\r')
{
*p_out++ = '\r';
written++;
}
*p_out++ = the_char;
written++;
indexx++;
last_char = the_char;
if (the_char == '\r')
{
ret.last_was_cr = 1;
}
else
{
ret.last_was_cr = 0;
}
}
ret.stored = written;
return ret;
}
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