encoding: add function to test if a str consists of ASCII characters
Most strings are ASCII. Let's optimize for it.
Using uint64_t is slightly faster than uint32_t on 64bit system, but there
isn't huge difference.
/*
parsers.c - efficient content parsing
Copyright 2008 Matt Mackall <mpm@selenic.com> and others
This software may be used and distributed according to the terms of
the GNU General Public License, incorporated herein by reference.
*/
#include <Python.h>
#include <ctype.h>
#include <stddef.h>
#include <string.h>
#include "charencode.h"
#include "util.h"
#include "bitmanipulation.h"
#ifdef IS_PY3K
/* The mapping of Python types is meant to be temporary to get Python
* 3 to compile. We should remove this once Python 3 support is fully
* supported and proper types are used in the extensions themselves. */
#define PyInt_Check PyLong_Check
#define PyInt_FromLong PyLong_FromLong
#define PyInt_FromSsize_t PyLong_FromSsize_t
#define PyInt_AsLong PyLong_AsLong
#endif
static const char *const versionerrortext = "Python minor version mismatch";
static PyObject *dict_new_presized(PyObject *self, PyObject *args)
{
Py_ssize_t expected_size;
if (!PyArg_ParseTuple(args, "n:make_presized_dict", &expected_size))
return NULL;
return _dict_new_presized(expected_size);
}
/*
* This code assumes that a manifest is stitched together with newline
* ('\n') characters.
*/
static PyObject *parse_manifest(PyObject *self, PyObject *args)
{
PyObject *mfdict, *fdict;
char *str, *start, *end;
int len;
if (!PyArg_ParseTuple(args, "O!O!s#:parse_manifest",
&PyDict_Type, &mfdict,
&PyDict_Type, &fdict,
&str, &len))
goto quit;
start = str;
end = str + len;
while (start < end) {
PyObject *file = NULL, *node = NULL;
PyObject *flags = NULL;
char *zero = NULL, *newline = NULL;
ptrdiff_t nlen;
zero = memchr(start, '\0', end - start);
if (!zero) {
PyErr_SetString(PyExc_ValueError,
"manifest entry has no separator");
goto quit;
}
newline = memchr(zero + 1, '\n', end - (zero + 1));
if (!newline) {
PyErr_SetString(PyExc_ValueError,
"manifest contains trailing garbage");
goto quit;
}
file = PyBytes_FromStringAndSize(start, zero - start);
if (!file)
goto bail;
nlen = newline - zero - 1;
node = unhexlify(zero + 1, nlen > 40 ? 40 : (Py_ssize_t)nlen);
if (!node)
goto bail;
if (nlen > 40) {
flags = PyBytes_FromStringAndSize(zero + 41,
nlen - 40);
if (!flags)
goto bail;
if (PyDict_SetItem(fdict, file, flags) == -1)
goto bail;
}
if (PyDict_SetItem(mfdict, file, node) == -1)
goto bail;
start = newline + 1;
Py_XDECREF(flags);
Py_XDECREF(node);
Py_XDECREF(file);
continue;
bail:
Py_XDECREF(flags);
Py_XDECREF(node);
Py_XDECREF(file);
goto quit;
}
Py_INCREF(Py_None);
return Py_None;
quit:
return NULL;
}
static inline dirstateTupleObject *make_dirstate_tuple(char state, int mode,
int size, int mtime)
{
dirstateTupleObject *t = PyObject_New(dirstateTupleObject,
&dirstateTupleType);
if (!t)
return NULL;
t->state = state;
t->mode = mode;
t->size = size;
t->mtime = mtime;
return t;
}
static PyObject *dirstate_tuple_new(PyTypeObject *subtype, PyObject *args,
PyObject *kwds)
{
/* We do all the initialization here and not a tp_init function because
* dirstate_tuple is immutable. */
dirstateTupleObject *t;
char state;
int size, mode, mtime;
if (!PyArg_ParseTuple(args, "ciii", &state, &mode, &size, &mtime))
return NULL;
t = (dirstateTupleObject *)subtype->tp_alloc(subtype, 1);
if (!t)
return NULL;
t->state = state;
t->mode = mode;
t->size = size;
t->mtime = mtime;
return (PyObject *)t;
}
static void dirstate_tuple_dealloc(PyObject *o)
{
PyObject_Del(o);
}
static Py_ssize_t dirstate_tuple_length(PyObject *o)
{
return 4;
}
static PyObject *dirstate_tuple_item(PyObject *o, Py_ssize_t i)
{
dirstateTupleObject *t = (dirstateTupleObject *)o;
switch (i) {
case 0:
return PyBytes_FromStringAndSize(&t->state, 1);
case 1:
return PyInt_FromLong(t->mode);
case 2:
return PyInt_FromLong(t->size);
case 3:
return PyInt_FromLong(t->mtime);
default:
PyErr_SetString(PyExc_IndexError, "index out of range");
return NULL;
}
}
static PySequenceMethods dirstate_tuple_sq = {
dirstate_tuple_length, /* sq_length */
0, /* sq_concat */
0, /* sq_repeat */
dirstate_tuple_item, /* sq_item */
0, /* sq_ass_item */
0, /* sq_contains */
0, /* sq_inplace_concat */
0 /* sq_inplace_repeat */
};
PyTypeObject dirstateTupleType = {
PyVarObject_HEAD_INIT(NULL, 0)
"dirstate_tuple", /* tp_name */
sizeof(dirstateTupleObject),/* tp_basicsize */
0, /* tp_itemsize */
(destructor)dirstate_tuple_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
&dirstate_tuple_sq, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
"dirstate tuple", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
dirstate_tuple_new, /* tp_new */
};
static PyObject *parse_dirstate(PyObject *self, PyObject *args)
{
PyObject *dmap, *cmap, *parents = NULL, *ret = NULL;
PyObject *fname = NULL, *cname = NULL, *entry = NULL;
char state, *cur, *str, *cpos;
int mode, size, mtime;
unsigned int flen, len, pos = 40;
int readlen;
if (!PyArg_ParseTuple(args, "O!O!s#:parse_dirstate",
&PyDict_Type, &dmap,
&PyDict_Type, &cmap,
&str, &readlen))
goto quit;
len = readlen;
/* read parents */
if (len < 40) {
PyErr_SetString(
PyExc_ValueError, "too little data for parents");
goto quit;
}
parents = Py_BuildValue("s#s#", str, 20, str + 20, 20);
if (!parents)
goto quit;
/* read filenames */
while (pos >= 40 && pos < len) {
if (pos + 17 > len) {
PyErr_SetString(PyExc_ValueError,
"overflow in dirstate");
goto quit;
}
cur = str + pos;
/* unpack header */
state = *cur;
mode = getbe32(cur + 1);
size = getbe32(cur + 5);
mtime = getbe32(cur + 9);
flen = getbe32(cur + 13);
pos += 17;
cur += 17;
if (flen > len - pos) {
PyErr_SetString(PyExc_ValueError, "overflow in dirstate");
goto quit;
}
entry = (PyObject *)make_dirstate_tuple(state, mode, size,
mtime);
cpos = memchr(cur, 0, flen);
if (cpos) {
fname = PyBytes_FromStringAndSize(cur, cpos - cur);
cname = PyBytes_FromStringAndSize(cpos + 1,
flen - (cpos - cur) - 1);
if (!fname || !cname ||
PyDict_SetItem(cmap, fname, cname) == -1 ||
PyDict_SetItem(dmap, fname, entry) == -1)
goto quit;
Py_DECREF(cname);
} else {
fname = PyBytes_FromStringAndSize(cur, flen);
if (!fname ||
PyDict_SetItem(dmap, fname, entry) == -1)
goto quit;
}
Py_DECREF(fname);
Py_DECREF(entry);
fname = cname = entry = NULL;
pos += flen;
}
ret = parents;
Py_INCREF(ret);
quit:
Py_XDECREF(fname);
Py_XDECREF(cname);
Py_XDECREF(entry);
Py_XDECREF(parents);
return ret;
}
/*
* Build a set of non-normal and other parent entries from the dirstate dmap
*/
static PyObject *nonnormalotherparententries(PyObject *self, PyObject *args) {
PyObject *dmap, *fname, *v;
PyObject *nonnset = NULL, *otherpset = NULL, *result = NULL;
Py_ssize_t pos;
if (!PyArg_ParseTuple(args, "O!:nonnormalentries",
&PyDict_Type, &dmap))
goto bail;
nonnset = PySet_New(NULL);
if (nonnset == NULL)
goto bail;
otherpset = PySet_New(NULL);
if (otherpset == NULL)
goto bail;
pos = 0;
while (PyDict_Next(dmap, &pos, &fname, &v)) {
dirstateTupleObject *t;
if (!dirstate_tuple_check(v)) {
PyErr_SetString(PyExc_TypeError,
"expected a dirstate tuple");
goto bail;
}
t = (dirstateTupleObject *)v;
if (t->state == 'n' && t->size == -2) {
if (PySet_Add(otherpset, fname) == -1) {
goto bail;
}
}
if (t->state == 'n' && t->mtime != -1)
continue;
if (PySet_Add(nonnset, fname) == -1)
goto bail;
}
result = Py_BuildValue("(OO)", nonnset, otherpset);
if (result == NULL)
goto bail;
Py_DECREF(nonnset);
Py_DECREF(otherpset);
return result;
bail:
Py_XDECREF(nonnset);
Py_XDECREF(otherpset);
Py_XDECREF(result);
return NULL;
}
/*
* Efficiently pack a dirstate object into its on-disk format.
*/
static PyObject *pack_dirstate(PyObject *self, PyObject *args)
{
PyObject *packobj = NULL;
PyObject *map, *copymap, *pl, *mtime_unset = NULL;
Py_ssize_t nbytes, pos, l;
PyObject *k, *v = NULL, *pn;
char *p, *s;
int now;
if (!PyArg_ParseTuple(args, "O!O!Oi:pack_dirstate",
&PyDict_Type, &map, &PyDict_Type, ©map,
&pl, &now))
return NULL;
if (!PySequence_Check(pl) || PySequence_Size(pl) != 2) {
PyErr_SetString(PyExc_TypeError, "expected 2-element sequence");
return NULL;
}
/* Figure out how much we need to allocate. */
for (nbytes = 40, pos = 0; PyDict_Next(map, &pos, &k, &v);) {
PyObject *c;
if (!PyBytes_Check(k)) {
PyErr_SetString(PyExc_TypeError, "expected string key");
goto bail;
}
nbytes += PyBytes_GET_SIZE(k) + 17;
c = PyDict_GetItem(copymap, k);
if (c) {
if (!PyBytes_Check(c)) {
PyErr_SetString(PyExc_TypeError,
"expected string key");
goto bail;
}
nbytes += PyBytes_GET_SIZE(c) + 1;
}
}
packobj = PyBytes_FromStringAndSize(NULL, nbytes);
if (packobj == NULL)
goto bail;
p = PyBytes_AS_STRING(packobj);
pn = PySequence_ITEM(pl, 0);
if (PyBytes_AsStringAndSize(pn, &s, &l) == -1 || l != 20) {
PyErr_SetString(PyExc_TypeError, "expected a 20-byte hash");
goto bail;
}
memcpy(p, s, l);
p += 20;
pn = PySequence_ITEM(pl, 1);
if (PyBytes_AsStringAndSize(pn, &s, &l) == -1 || l != 20) {
PyErr_SetString(PyExc_TypeError, "expected a 20-byte hash");
goto bail;
}
memcpy(p, s, l);
p += 20;
for (pos = 0; PyDict_Next(map, &pos, &k, &v); ) {
dirstateTupleObject *tuple;
char state;
int mode, size, mtime;
Py_ssize_t len, l;
PyObject *o;
char *t;
if (!dirstate_tuple_check(v)) {
PyErr_SetString(PyExc_TypeError,
"expected a dirstate tuple");
goto bail;
}
tuple = (dirstateTupleObject *)v;
state = tuple->state;
mode = tuple->mode;
size = tuple->size;
mtime = tuple->mtime;
if (state == 'n' && mtime == now) {
/* See pure/parsers.py:pack_dirstate for why we do
* this. */
mtime = -1;
mtime_unset = (PyObject *)make_dirstate_tuple(
state, mode, size, mtime);
if (!mtime_unset)
goto bail;
if (PyDict_SetItem(map, k, mtime_unset) == -1)
goto bail;
Py_DECREF(mtime_unset);
mtime_unset = NULL;
}
*p++ = state;
putbe32((uint32_t)mode, p);
putbe32((uint32_t)size, p + 4);
putbe32((uint32_t)mtime, p + 8);
t = p + 12;
p += 16;
len = PyBytes_GET_SIZE(k);
memcpy(p, PyBytes_AS_STRING(k), len);
p += len;
o = PyDict_GetItem(copymap, k);
if (o) {
*p++ = '\0';
l = PyBytes_GET_SIZE(o);
memcpy(p, PyBytes_AS_STRING(o), l);
p += l;
len += l + 1;
}
putbe32((uint32_t)len, t);
}
pos = p - PyBytes_AS_STRING(packobj);
if (pos != nbytes) {
PyErr_Format(PyExc_SystemError, "bad dirstate size: %ld != %ld",
(long)pos, (long)nbytes);
goto bail;
}
return packobj;
bail:
Py_XDECREF(mtime_unset);
Py_XDECREF(packobj);
Py_XDECREF(v);
return NULL;
}
#define BUMPED_FIX 1
#define USING_SHA_256 2
#define FM1_HEADER_SIZE (4 + 8 + 2 + 2 + 1 + 1 + 1)
static PyObject *readshas(
const char *source, unsigned char num, Py_ssize_t hashwidth)
{
int i;
PyObject *list = PyTuple_New(num);
if (list == NULL) {
return NULL;
}
for (i = 0; i < num; i++) {
PyObject *hash = PyBytes_FromStringAndSize(source, hashwidth);
if (hash == NULL) {
Py_DECREF(list);
return NULL;
}
PyTuple_SET_ITEM(list, i, hash);
source += hashwidth;
}
return list;
}
static PyObject *fm1readmarker(const char *databegin, const char *dataend,
uint32_t *msize)
{
const char *data = databegin;
const char *meta;
double mtime;
int16_t tz;
uint16_t flags;
unsigned char nsuccs, nparents, nmetadata;
Py_ssize_t hashwidth = 20;
PyObject *prec = NULL, *parents = NULL, *succs = NULL;
PyObject *metadata = NULL, *ret = NULL;
int i;
if (data + FM1_HEADER_SIZE > dataend) {
goto overflow;
}
*msize = getbe32(data);
data += 4;
mtime = getbefloat64(data);
data += 8;
tz = getbeint16(data);
data += 2;
flags = getbeuint16(data);
data += 2;
if (flags & USING_SHA_256) {
hashwidth = 32;
}
nsuccs = (unsigned char)(*data++);
nparents = (unsigned char)(*data++);
nmetadata = (unsigned char)(*data++);
if (databegin + *msize > dataend) {
goto overflow;
}
dataend = databegin + *msize; /* narrow down to marker size */
if (data + hashwidth > dataend) {
goto overflow;
}
prec = PyBytes_FromStringAndSize(data, hashwidth);
data += hashwidth;
if (prec == NULL) {
goto bail;
}
if (data + nsuccs * hashwidth > dataend) {
goto overflow;
}
succs = readshas(data, nsuccs, hashwidth);
if (succs == NULL) {
goto bail;
}
data += nsuccs * hashwidth;
if (nparents == 1 || nparents == 2) {
if (data + nparents * hashwidth > dataend) {
goto overflow;
}
parents = readshas(data, nparents, hashwidth);
if (parents == NULL) {
goto bail;
}
data += nparents * hashwidth;
} else {
parents = Py_None;
Py_INCREF(parents);
}
if (data + 2 * nmetadata > dataend) {
goto overflow;
}
meta = data + (2 * nmetadata);
metadata = PyTuple_New(nmetadata);
if (metadata == NULL) {
goto bail;
}
for (i = 0; i < nmetadata; i++) {
PyObject *tmp, *left = NULL, *right = NULL;
Py_ssize_t leftsize = (unsigned char)(*data++);
Py_ssize_t rightsize = (unsigned char)(*data++);
if (meta + leftsize + rightsize > dataend) {
goto overflow;
}
left = PyBytes_FromStringAndSize(meta, leftsize);
meta += leftsize;
right = PyBytes_FromStringAndSize(meta, rightsize);
meta += rightsize;
tmp = PyTuple_New(2);
if (!left || !right || !tmp) {
Py_XDECREF(left);
Py_XDECREF(right);
Py_XDECREF(tmp);
goto bail;
}
PyTuple_SET_ITEM(tmp, 0, left);
PyTuple_SET_ITEM(tmp, 1, right);
PyTuple_SET_ITEM(metadata, i, tmp);
}
ret = Py_BuildValue("(OOHO(di)O)", prec, succs, flags,
metadata, mtime, (int)tz * 60, parents);
goto bail; /* return successfully */
overflow:
PyErr_SetString(PyExc_ValueError, "overflow in obsstore");
bail:
Py_XDECREF(prec);
Py_XDECREF(succs);
Py_XDECREF(metadata);
Py_XDECREF(parents);
return ret;
}
static PyObject *fm1readmarkers(PyObject *self, PyObject *args) {
const char *data, *dataend;
int datalen;
Py_ssize_t offset, stop;
PyObject *markers = NULL;
if (!PyArg_ParseTuple(args, "s#nn", &data, &datalen, &offset, &stop)) {
return NULL;
}
dataend = data + datalen;
data += offset;
markers = PyList_New(0);
if (!markers) {
return NULL;
}
while (offset < stop) {
uint32_t msize;
int error;
PyObject *record = fm1readmarker(data, dataend, &msize);
if (!record) {
goto bail;
}
error = PyList_Append(markers, record);
Py_DECREF(record);
if (error) {
goto bail;
}
data += msize;
offset += msize;
}
return markers;
bail:
Py_DECREF(markers);
return NULL;
}
static char parsers_doc[] = "Efficient content parsing.";
PyObject *encodedir(PyObject *self, PyObject *args);
PyObject *pathencode(PyObject *self, PyObject *args);
PyObject *lowerencode(PyObject *self, PyObject *args);
PyObject *parse_index2(PyObject *self, PyObject *args);
static PyMethodDef methods[] = {
{"pack_dirstate", pack_dirstate, METH_VARARGS, "pack a dirstate\n"},
{"nonnormalotherparententries", nonnormalotherparententries, METH_VARARGS,
"create a set containing non-normal and other parent entries of given "
"dirstate\n"},
{"parse_manifest", parse_manifest, METH_VARARGS, "parse a manifest\n"},
{"parse_dirstate", parse_dirstate, METH_VARARGS, "parse a dirstate\n"},
{"parse_index2", parse_index2, METH_VARARGS, "parse a revlog index\n"},
{"isasciistr", isasciistr, METH_VARARGS, "check if an ASCII string\n"},
{"asciilower", asciilower, METH_VARARGS, "lowercase an ASCII string\n"},
{"asciiupper", asciiupper, METH_VARARGS, "uppercase an ASCII string\n"},
{"dict_new_presized", dict_new_presized, METH_VARARGS,
"construct a dict with an expected size\n"},
{"make_file_foldmap", make_file_foldmap, METH_VARARGS,
"make file foldmap\n"},
{"jsonescapeu8fast", jsonescapeu8fast, METH_VARARGS,
"escape a UTF-8 byte string to JSON (fast path)\n"},
{"encodedir", encodedir, METH_VARARGS, "encodedir a path\n"},
{"pathencode", pathencode, METH_VARARGS, "fncache-encode a path\n"},
{"lowerencode", lowerencode, METH_VARARGS, "lower-encode a path\n"},
{"fm1readmarkers", fm1readmarkers, METH_VARARGS,
"parse v1 obsolete markers\n"},
{NULL, NULL}
};
void dirs_module_init(PyObject *mod);
void manifest_module_init(PyObject *mod);
void revlog_module_init(PyObject *mod);
static const int version = 3;
static void module_init(PyObject *mod)
{
PyModule_AddIntConstant(mod, "version", version);
/* This module constant has two purposes. First, it lets us unit test
* the ImportError raised without hard-coding any error text. This
* means we can change the text in the future without breaking tests,
* even across changesets without a recompile. Second, its presence
* can be used to determine whether the version-checking logic is
* present, which also helps in testing across changesets without a
* recompile. Note that this means the pure-Python version of parsers
* should not have this module constant. */
PyModule_AddStringConstant(mod, "versionerrortext", versionerrortext);
dirs_module_init(mod);
manifest_module_init(mod);
revlog_module_init(mod);
if (PyType_Ready(&dirstateTupleType) < 0)
return;
Py_INCREF(&dirstateTupleType);
PyModule_AddObject(mod, "dirstatetuple",
(PyObject *)&dirstateTupleType);
}
static int check_python_version(void)
{
PyObject *sys = PyImport_ImportModule("sys"), *ver;
long hexversion;
if (!sys)
return -1;
ver = PyObject_GetAttrString(sys, "hexversion");
Py_DECREF(sys);
if (!ver)
return -1;
hexversion = PyInt_AsLong(ver);
Py_DECREF(ver);
/* sys.hexversion is a 32-bit number by default, so the -1 case
* should only occur in unusual circumstances (e.g. if sys.hexversion
* is manually set to an invalid value). */
if ((hexversion == -1) || (hexversion >> 16 != PY_VERSION_HEX >> 16)) {
PyErr_Format(PyExc_ImportError, "%s: The Mercurial extension "
"modules were compiled with Python " PY_VERSION ", but "
"Mercurial is currently using Python with sys.hexversion=%ld: "
"Python %s\n at: %s", versionerrortext, hexversion,
Py_GetVersion(), Py_GetProgramFullPath());
return -1;
}
return 0;
}
#ifdef IS_PY3K
static struct PyModuleDef parsers_module = {
PyModuleDef_HEAD_INIT,
"parsers",
parsers_doc,
-1,
methods
};
PyMODINIT_FUNC PyInit_parsers(void)
{
PyObject *mod;
if (check_python_version() == -1)
return NULL;
mod = PyModule_Create(&parsers_module);
module_init(mod);
return mod;
}
#else
PyMODINIT_FUNC initparsers(void)
{
PyObject *mod;
if (check_python_version() == -1)
return;
mod = Py_InitModule3("parsers", methods, parsers_doc);
module_init(mod);
}
#endif