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Merge pull request #1049 from Dobatymo/colors-bytes

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serialize/deserialize colors to/from bytes instead of strings
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Andrew Senetar 2023-01-26 21:24:20 -06:00 committed by GitHub
commit e41c91623c
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7 changed files with 114 additions and 132 deletions
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23
core/pe/cache.py
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@ -4,24 +4,13 @@
# which should be included with this package. The terms are also available at
# http://www.gnu.org/licenses/gpl-3.0.html
from core.pe._cache import string_to_colors # noqa
from core.pe._cache import bytes_to_colors # noqa
def colors_to_string(colors):
"""Transform the 3 sized tuples 'colors' into a hex string.
def colors_to_bytes(colors):
"""Transform the 3 sized tuples 'colors' into a bytes string.
[(0,100,255)] --> 0064ff
[(1,2,3),(4,5,6)] --> 010203040506
[(0,100,255)] --> b'\x00d\xff'
[(1,2,3),(4,5,6)] --> b'\x01\x02\x03\x04\x05\x06'
"""
return "".join("{:02x}{:02x}{:02x}".format(r, g, b) for r, g, b in colors)
# This function is an important bottleneck of dupeGuru PE. It has been converted to C.
# def string_to_colors(s):
# """Transform the string 's' in a list of 3 sized tuples.
# """
# result = []
# for i in xrange(0, len(s), 6):
# number = int(s[i:i+6], 16)
# result.append((number >> 16, (number >> 8) & 0xff, number & 0xff))
# return result
return b"".join(map(bytes, colors))

4
core/pe/cache.pyi
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@ -2,5 +2,5 @@ from typing import Union, Tuple, List
_block = Tuple[int, int, int]
def colors_to_string(colors: List[_block]) -> str: ... # noqa: E302
def string_to_colors(s: str) -> Union[List[_block], None]: ...
def colors_to_bytes(colors: List[_block]) -> bytes: ... # noqa: E302
def bytes_to_colors(s: bytes) -> Union[List[_block], None]: ...

60
core/pe/cache_sqlite.py
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@ -9,12 +9,20 @@ import os.path as op
import logging
import sqlite3 as sqlite
from core.pe.cache import string_to_colors, colors_to_string
from core.pe.cache import bytes_to_colors, colors_to_bytes
class SqliteCache:
"""A class to cache picture blocks in a sqlite backend."""
schema_version = 1
schema_version_description = "Changed from string to bytes for blocks."
create_table_query = "CREATE TABLE IF NOT EXISTS pictures(path TEXT, mtime_ns INTEGER, blocks BLOB)"
create_index_query = "CREATE INDEX IF NOT EXISTS idx_path on pictures (path)"
drop_table_query = "DROP TABLE IF EXISTS pictures"
drop_index_query = "DROP INDEX IF EXISTS idx_path"
def __init__(self, db=":memory:", readonly=False):
# readonly is not used in the sqlite version of the cache
self.dbname = db
@ -40,7 +48,7 @@ class SqliteCache:
sql = "select blocks from pictures where path = ?"
result = self.con.execute(sql, [key]).fetchone()
if result:
result = string_to_colors(result[0])
result = bytes_to_colors(result[0])
return result
else:
raise KeyError(key)
@ -56,15 +64,15 @@ class SqliteCache:
return result[0][0]
def __setitem__(self, path_str, blocks):
blocks = colors_to_string(blocks)
blocks = colors_to_bytes(blocks)
if op.exists(path_str):
mtime = int(os.stat(path_str).st_mtime)
else:
mtime = 0
if path_str in self:
sql = "update pictures set blocks = ?, mtime = ? where path = ?"
sql = "update pictures set blocks = ?, mtime_ns = ? where path = ?"
else:
sql = "insert into pictures(blocks,mtime,path) values(?,?,?)"
sql = "insert into pictures(blocks,mtime_ns,path) values(?,?,?)"
try:
self.con.execute(sql, [blocks, mtime, path_str])
except sqlite.OperationalError:
@ -73,18 +81,9 @@ class SqliteCache:
logging.warning("DatabaseError while setting value for key %r: %s", path_str, str(e))
def _create_con(self, second_try=False):
def create_tables():
logging.debug("Creating picture cache tables.")
self.con.execute("drop table if exists pictures")
self.con.execute("drop index if exists idx_path")
self.con.execute("create table pictures(path TEXT, mtime INTEGER, blocks TEXT)")
self.con.execute("create index idx_path on pictures (path)")
self.con = sqlite.connect(self.dbname, isolation_level=None)
try:
self.con.execute("select path, mtime, blocks from pictures where 1=2")
except sqlite.OperationalError: # new db
create_tables()
self.con = sqlite.connect(self.dbname, isolation_level=None)
self._check_upgrade()
except sqlite.DatabaseError as e: # corrupted db
if second_try:
raise # Something really strange is happening
@ -93,6 +92,25 @@ class SqliteCache:
os.remove(self.dbname)
self._create_con(second_try=True)
def _check_upgrade(self) -> None:
with self.con as conn:
has_schema = conn.execute(
"SELECT NAME FROM sqlite_master WHERE type='table' AND name='schema_version'"
).fetchall()
version = None
if has_schema:
version = conn.execute("SELECT version FROM schema_version ORDER BY version DESC").fetchone()[0]
else:
conn.execute("CREATE TABLE schema_version (version int PRIMARY KEY, description TEXT)")
if version != self.schema_version:
conn.execute(self.drop_table_query)
conn.execute(
"INSERT OR REPLACE INTO schema_version VALUES (:version, :description)",
{"version": self.schema_version, "description": self.schema_version_description},
)
conn.execute(self.create_table_query)
conn.execute(self.create_index_query)
def clear(self):
self.close()
if self.dbname != ":memory:":
@ -120,7 +138,7 @@ class SqliteCache:
def get_multiple(self, rowids):
sql = "select rowid, blocks from pictures where rowid in (%s)" % ",".join(map(str, rowids))
cur = self.con.execute(sql)
return ((rowid, string_to_colors(blocks)) for rowid, blocks in cur)
return ((rowid, bytes_to_colors(blocks)) for rowid, blocks in cur)
def purge_outdated(self):
"""Go through the cache and purge outdated records.
@ -129,12 +147,12 @@ class SqliteCache:
the db.
"""
todelete = []
sql = "select rowid, path, mtime from pictures"
sql = "select rowid, path, mtime_ns from pictures"
cur = self.con.execute(sql)
for rowid, path_str, mtime in cur:
if mtime and op.exists(path_str):
for rowid, path_str, mtime_ns in cur:
if mtime_ns and op.exists(path_str):
picture_mtime = os.stat(path_str).st_mtime
if int(picture_mtime) <= mtime:
if int(picture_mtime) <= mtime_ns:
# not outdated
continue
todelete.append(rowid)

2
core/pe/matchblock.py
View File

@ -28,7 +28,7 @@ from core.pe.cache_sqlite import SqliteCache
# to files in other chunks. So chunkifying doesn't save us any actual comparison, but the advantage
# is that instead of reading blocks from disk number_of_files**2 times, we read it
# number_of_files*number_of_chunks times.
# Determining the right chunk size is tricky, bceause if it's too big, too many blocks will be in
# Determining the right chunk size is tricky, because if it's too big, too many blocks will be in
# memory at the same time and we might end up with memory trashing, which is awfully slow. So,
# because our *real* bottleneck is CPU, the chunk size must simply be enough so that the CPU isn't
# starved by Disk IOs.

130
core/pe/modules/cache.c
View File

@ -2,94 +2,68 @@
* Created On: 2010-01-30
* Copyright 2014 Hardcoded Software (http://www.hardcoded.net)
*
* This software is licensed under the "BSD" License as described in the "LICENSE" file,
* which should be included with this package. The terms are also available at
* http://www.hardcoded.net/licenses/bsd_license
* This software is licensed under the "BSD" License as described in the
* "LICENSE" file, which should be included with this package. The terms are
* also available at http://www.hardcoded.net/licenses/bsd_license
*/
#include "common.h"
/* I know that there strtol out there, but it requires a pointer to
* a char, which would in turn require me to buffer my chars around,
* making the whole process slower.
*/
static long
xchar_to_long(char c)
{
if ((c >= 48) && (c <= 57)) { /* 0-9 */
return c - 48;
static PyObject *cache_bytes_to_colors(PyObject *self, PyObject *args) {
char *y;
Py_ssize_t char_count, i, color_count;
PyObject *result;
unsigned long r, g, b;
Py_ssize_t ci;
PyObject *color_tuple;
if (!PyArg_ParseTuple(args, "y#", &y, &char_count)) {
return NULL;
}
color_count = char_count / 3;
result = PyList_New(color_count);
if (result == NULL) {
return NULL;
}
for (i = 0; i < color_count; i++) {
ci = i * 3;
r = (unsigned char)y[ci];
g = (unsigned char)y[ci + 1];
b = (unsigned char)y[ci + 2];
color_tuple = inttuple(3, r, g, b);
if (color_tuple == NULL) {
Py_DECREF(result);
return NULL;
}
else if ((c >= 65) && (c <= 70)) { /* A-F */
return c - 55;
}
else if ((c >= 97) && (c <= 102)) { /* a-f */
return c - 87;
}
return 0;
}
PyList_SET_ITEM(result, i, color_tuple);
}
static PyObject*
cache_string_to_colors(PyObject *self, PyObject *args)
{
char *s;
Py_ssize_t char_count, color_count, i;
PyObject *result;
if (!PyArg_ParseTuple(args, "s#", &s, &char_count)) {
return NULL;
}
color_count = (char_count / 6);
result = PyList_New(color_count);
if (result == NULL) {
return NULL;
}
for (i=0; i<color_count; i++) {
long r, g, b;
Py_ssize_t ci;
PyObject *color_tuple;
ci = i * 6;
r = (xchar_to_long(s[ci]) << 4) + xchar_to_long(s[ci+1]);
g = (xchar_to_long(s[ci+2]) << 4) + xchar_to_long(s[ci+3]);
b = (xchar_to_long(s[ci+4]) << 4) + xchar_to_long(s[ci+5]);
color_tuple = inttuple(3, r, g, b);
if (color_tuple == NULL) {
Py_DECREF(result);
return NULL;
}
PyList_SET_ITEM(result, i, color_tuple);
}
return result;
return result;
}
static PyMethodDef CacheMethods[] = {
{"string_to_colors", cache_string_to_colors, METH_VARARGS,
"Transform the string 's' in a list of 3 sized tuples."},
{NULL, NULL, 0, NULL} /* Sentinel */
{"bytes_to_colors", cache_bytes_to_colors, METH_VARARGS,
"Transform the bytes 's' into a list of 3 sized tuples."},
{NULL, NULL, 0, NULL} /* Sentinel */
};
static struct PyModuleDef CacheDef = {
PyModuleDef_HEAD_INIT,
"_cache",
NULL,
-1,
CacheMethods,
NULL,
NULL,
NULL,
NULL
};
static struct PyModuleDef CacheDef = {PyModuleDef_HEAD_INIT,
"_cache",
NULL,
-1,
CacheMethods,
NULL,
NULL,
NULL,
NULL};
PyObject *
PyInit__cache(void)
{
PyObject *m = PyModule_Create(&CacheDef);
if (m == NULL) {
return NULL;
}
return m;
PyObject *PyInit__cache(void) {
PyObject *m = PyModule_Create(&CacheDef);
if (m == NULL) {
return NULL;
}
return m;
}

2
core/pe/modules/common.c
View File

@ -32,7 +32,7 @@ PyObject* inttuple(int n, ...)
result = PyTuple_New(n);
for (i=0; i<n; i++) {
pnumber = PyLong_FromLong(va_arg(numbers, long));
pnumber = PyLong_FromUnsignedLong(va_arg(numbers, long));
if (pnumber == NULL) {
Py_DECREF(result);
return NULL;

25
core/tests/cache_test.py
View File

@ -10,7 +10,7 @@ from pytest import raises, skip
from hscommon.testutil import eq_
try:
from core.pe.cache import colors_to_string, string_to_colors
from core.pe.cache import colors_to_bytes, bytes_to_colors
from core.pe.cache_sqlite import SqliteCache
except ImportError:
skip("Can't import the cache module, probably hasn't been compiled.")
@ -18,32 +18,33 @@ except ImportError:
class TestCaseColorsToString:
def test_no_color(self):
eq_("", colors_to_string([]))
eq_(b"", colors_to_bytes([]))
def test_single_color(self):
eq_("000000", colors_to_string([(0, 0, 0)]))
eq_("010101", colors_to_string([(1, 1, 1)]))
eq_("0a141e", colors_to_string([(10, 20, 30)]))
eq_(b"\x00\x00\x00", colors_to_bytes([(0, 0, 0)]))
eq_(b"\x01\x01\x01", colors_to_bytes([(1, 1, 1)]))
eq_(b"\x0a\x14\x1e", colors_to_bytes([(10, 20, 30)]))
def test_two_colors(self):
eq_("000102030405", colors_to_string([(0, 1, 2), (3, 4, 5)]))
eq_(b"\x00\x01\x02\x03\x04\x05", colors_to_bytes([(0, 1, 2), (3, 4, 5)]))
class TestCaseStringToColors:
def test_empty(self):
eq_([], string_to_colors(""))
eq_([], bytes_to_colors(b""))
def test_single_color(self):
eq_([(0, 0, 0)], string_to_colors("000000"))
eq_([(2, 3, 4)], string_to_colors("020304"))
eq_([(10, 20, 30)], string_to_colors("0a141e"))
eq_([(0, 0, 0)], bytes_to_colors(b"\x00\x00\x00"))
eq_([(2, 3, 4)], bytes_to_colors(b"\x02\x03\x04"))
eq_([(10, 20, 30)], bytes_to_colors(b"\x0a\x14\x1e"))
def test_two_colors(self):
eq_([(10, 20, 30), (40, 50, 60)], string_to_colors("0a141e28323c"))
eq_([(10, 20, 30), (40, 50, 60)], bytes_to_colors(b"\x0a\x14\x1e\x28\x32\x3c"))
def test_incomplete_color(self):
# don't return anything if it's not a complete color
eq_([], string_to_colors("102"))
eq_([], bytes_to_colors(b"\x01"))
eq_([(1, 2, 3)], bytes_to_colors(b"\x01\x02\x03\x04"))
class BaseTestCaseCache: