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#include "cache.h"
/*
* convert.c - convert a file when checking it out and checking it in.
*
* This should use the pathname to decide on whether it wants to do some
* more interesting conversions (automatic gzip/unzip, general format
* conversions etc etc), but by default it just does automatic CRLF<->LF
* translation when the "auto_crlf" option is set.
*/
struct text_stat {
/* CR, LF and CRLF counts */
unsigned cr, lf, crlf;
/* These are just approximations! */
unsigned printable, nonprintable;
};
static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats)
{
unsigned long i;
memset(stats, 0, sizeof(*stats));
for (i = 0; i < size; i++) {
unsigned char c = buf[i];
if (c == '\r') {
stats->cr++;
if (i+1 < size && buf[i+1] == '\n')
stats->crlf++;
continue;
}
if (c == '\n') {
stats->lf++;
continue;
}
if (c == 127)
/* DEL */
stats->nonprintable++;
else if (c < 32) {
switch (c) {
/* BS, HT, ESC and FF */
case '\b': case '\t': case '\033': case '\014':
stats->printable++;
break;
default:
stats->nonprintable++;
}
}
else
stats->printable++;
}
}
/*
* The same heuristics as diff.c::mmfile_is_binary()
*/
static int is_binary(unsigned long size, struct text_stat *stats)
{
if ((stats->printable >> 7) < stats->nonprintable)
return 1;
/*
* Other heuristics? Average line length might be relevant,
* as might LF vs CR vs CRLF counts..
*
* NOTE! It might be normal to have a low ratio of CRLF to LF
* (somebody starts with a LF-only file and edits it with an editor
* that adds CRLF only to lines that are added..). But do we
* want to support CR-only? Probably not.
*/
return 0;
}
int convert_to_git(const char *path, char **bufp, unsigned long *sizep)
{
char *buffer, *nbuf;
unsigned long size, nsize;
struct text_stat stats;
/*
* FIXME! Other pluggable conversions should go here,
* based on filename patterns. Right now we just do the
* stupid auto-CRLF one.
*/
if (!auto_crlf)
return 0;
size = *sizep;
if (!size)
return 0;
buffer = *bufp;
gather_stats(buffer, size, &stats);
/* No CR? Nothing to convert, regardless. */
if (!stats.cr)
return 0;
/*
* We're currently not going to even try to convert stuff
* that has bare CR characters. Does anybody do that crazy
* stuff?
*/
if (stats.cr != stats.crlf)
return 0;
/*
* And add some heuristics for binary vs text, of course...
*/
if (is_binary(size, &stats))
return 0;
/*
* Ok, allocate a new buffer, fill it in, and return true
* to let the caller know that we switched buffers on it.
*/
nsize = size - stats.crlf;
nbuf = xmalloc(nsize);
*bufp = nbuf;
*sizep = nsize;
do {
unsigned char c = *buffer++;
if (c != '\r')
*nbuf++ = c;
} while (--size);
return 1;
}
int convert_to_working_tree(const char *path, char **bufp, unsigned long *sizep)
{
char *buffer, *nbuf;
unsigned long size, nsize;
struct text_stat stats;
unsigned char last;
/*
* FIXME! Other pluggable conversions should go here,
* based on filename patterns. Right now we just do the
* stupid auto-CRLF one.
*/
if (!auto_crlf)
return 0;
size = *sizep;
if (!size)
return 0;
buffer = *bufp;
gather_stats(buffer, size, &stats);
/* No LF? Nothing to convert, regardless. */
if (!stats.lf)
return 0;
/* Was it already in CRLF format? */
if (stats.lf == stats.crlf)
return 0;
/* If we have any bare CR characters, we're not going to touch it */
if (stats.cr != stats.crlf)
return 0;
if (is_binary(size, &stats))
return 0;
/*
* Ok, allocate a new buffer, fill it in, and return true
* to let the caller know that we switched buffers on it.
*/
nsize = size + stats.lf - stats.crlf;
nbuf = xmalloc(nsize);
*bufp = nbuf;
*sizep = nsize;
last = 0;
do {
unsigned char c = *buffer++;
if (c == '\n' && last != '\r')
*nbuf++ = '\r';
*nbuf++ = c;
last = c;
} while (--size);
return 1;
}
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