comparison mercurial/pathencode.c @ 18433:79f4a2a8f248

pathencode: implement hashed encoding in C

This will be used by an upcoming patch.

18432:39954be8ece7

				      path, len);

	return ret;
}

static PyObject *hashmangle(const char *src, Py_ssize_t len, const char sha[20])
{
	static const Py_ssize_t dirprefixlen = 8;
	static const Py_ssize_t maxshortdirslen = 68;
	char *dest;

	memcpy(hash, PyString_AS_STRING(hashobj), 20);
	Py_DECREF(hashobj);
	return 0;
}

/*
 * We currently implement only basic encoding.
 *
 * If a name is too long to encode due to Windows path name limits,
 * this function returns None.

18433:79f4a2a8f248

				      path, len);

	return ret;
}

/* See store.py:_auxencode for a description. */
static Py_ssize_t auxencode(char *dest, size_t destsize,
			    const char *src, Py_ssize_t len)
{
	static const uint32_t twobytes[8];

	static const uint32_t onebyte[8] = {
		~0, 0xffff3ffe, ~0, ~0, ~0, ~0, ~0, ~0,
	};

	return _encode(twobytes, onebyte, dest, 0, destsize, src, len, 0);
}

static PyObject *hashmangle(const char *src, Py_ssize_t len, const char sha[20])
{
	static const Py_ssize_t dirprefixlen = 8;
	static const Py_ssize_t maxshortdirslen = 68;
	char *dest;

	memcpy(hash, PyString_AS_STRING(hashobj), 20);
	Py_DECREF(hashobj);
	return 0;
}

static PyObject *hashencode(const char *src, Py_ssize_t len)
{
	const Py_ssize_t baselen = (len - 5) * 3;
#ifndef _MSC_VER
	/* alloca is surprisingly slow, so avoid when possible */
	char dired[baselen];
	char lowered[baselen];
	char auxed[baselen];
#else
	char *dired = alloca(baselen);
	char *lowered = alloca(baselen);
	char *auxed = alloca(baselen);
#endif
	Py_ssize_t dirlen, lowerlen, auxlen;
	char sha[20];

	dirlen = _encodedir(dired, baselen, src, len);
	if (sha1hash(sha, dired, dirlen - 1) == -1)
		return NULL;
	lowerlen = _lowerencode(lowered, baselen, dired + 5, dirlen - 5);
	auxlen = auxencode(auxed, baselen, lowered, lowerlen);
	return hashmangle(auxed, auxlen, sha);
}

/*
 * We currently implement only basic encoding.
 *
 * If a name is too long to encode due to Windows path name limits,
 * this function returns None.