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gh-132983: Minor fixes and clean up for the _zstd module by serhiy-storchaka · Pull Request #134930 · python/cpython · GitHub

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gh-132983: Minor fixes and clean up for the _zstd module #134930

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serhiy-storchaka merged 9 commits into from
Jun 1, 2025
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gh-132983: Minor fixes and clean up for the _zstd module #134930

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9aec708
gh-132983: Minor fixes and clean up for the _zstd module
serhiy-storchaka May 30, 2025
0251f9e
Remove defensive double checks after releasing the GIL.
serhiy-storchaka May 31, 2025
710a2b3
Apply suggestions from code review
serhiy-storchaka May 31, 2025
88e9c0a
Merge remote-tracking branch 'refs/remotes/origin/zstd-fixes' into zs…
serhiy-storchaka May 31, 2025
cffe18b
Refactor _zstd_load_c_dict and _zstd_load_d_dict.
serhiy-storchaka May 31, 2025
0dd3b2a
ts
serhiy-storchaka May 31, 2025
4877c81
Merge branch 'main' into zstd-fixes
serhiy-storchaka May 31, 2025
b15f2e4
Update Modules/_zstd/_zstdmodule.c
serhiy-storchaka Jun 1, 2025
fe83254
Update tests.
serhiy-storchaka Jun 1, 2025
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92 changes: 77 additions & 15 deletions Lib/test/test_zstd.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1138,27 +1138,41 @@ def test_invalid_dict(self):
ZstdDecompressor(zd)

# wrong type
with self.assertRaisesRegex(TypeError, r'should be ZstdDict object'):
ZstdCompressor(zstd_dict=(zd, b'123'))
with self.assertRaisesRegex(TypeError, r'should be ZstdDict object'):
with self.assertRaisesRegex(TypeError, r'should be a ZstdDict object'):
ZstdCompressor(zstd_dict=[zd, 1])
with self.assertRaisesRegex(TypeError, r'should be a ZstdDict object'):
ZstdCompressor(zstd_dict=(zd, 1.0))
with self.assertRaisesRegex(TypeError, r'should be a ZstdDict object'):
ZstdCompressor(zstd_dict=(zd,))
with self.assertRaisesRegex(TypeError, r'should be a ZstdDict object'):
ZstdCompressor(zstd_dict=(zd, 1, 2))
with self.assertRaisesRegex(TypeError, r'should be ZstdDict object'):
with self.assertRaisesRegex(TypeError, r'should be a ZstdDict object'):
ZstdCompressor(zstd_dict=(zd, -1))
with self.assertRaisesRegex(TypeError, r'should be ZstdDict object'):
with self.assertRaisesRegex(TypeError, r'should be a ZstdDict object'):
ZstdCompressor(zstd_dict=(zd, 3))

with self.assertRaisesRegex(TypeError, r'should be ZstdDict object'):
ZstdDecompressor(zstd_dict=(zd, b'123'))
with self.assertRaisesRegex(TypeError, r'should be ZstdDict object'):
with self.assertRaises(OverflowError):
ZstdCompressor(zstd_dict=(zd, 2**1000))
with self.assertRaises(OverflowError):
ZstdCompressor(zstd_dict=(zd, -2**1000))

with self.assertRaisesRegex(TypeError, r'should be a ZstdDict object'):
ZstdDecompressor(zstd_dict=[zd, 1])
with self.assertRaisesRegex(TypeError, r'should be a ZstdDict object'):
ZstdDecompressor(zstd_dict=(zd, 1.0))
with self.assertRaisesRegex(TypeError, r'should be a ZstdDict object'):
ZstdDecompressor((zd,))
with self.assertRaisesRegex(TypeError, r'should be a ZstdDict object'):
ZstdDecompressor((zd, 1, 2))
with self.assertRaisesRegex(TypeError, r'should be ZstdDict object'):
with self.assertRaisesRegex(TypeError, r'should be a ZstdDict object'):
ZstdDecompressor((zd, -1))
with self.assertRaisesRegex(TypeError, r'should be ZstdDict object'):
with self.assertRaisesRegex(TypeError, r'should be a ZstdDict object'):
ZstdDecompressor((zd, 3))
with self.assertRaises(OverflowError):
ZstdDecompressor((zd, 2**1000))
with self.assertRaises(OverflowError):
ZstdDecompressor((zd, -2**1000))

def test_train_dict(self):


TRAINED_DICT = train_dict(SAMPLES, DICT_SIZE1)
ZstdDict(TRAINED_DICT.dict_content, is_raw=False)

Expand Down Expand Up @@ -1239,18 +1253,37 @@ def test_train_dict_c(self):
# argument wrong type
with self.assertRaises(TypeError):
_zstd.train_dict({}, (), 100)
with self.assertRaises(TypeError):
_zstd.train_dict(bytearray(), (), 100)
with self.assertRaises(TypeError):
_zstd.train_dict(b'', 99, 100)
with self.assertRaises(TypeError):
_zstd.train_dict(b'', [], 100)
with self.assertRaises(TypeError):
_zstd.train_dict(b'', (), 100.1)
with self.assertRaises(TypeError):
_zstd.train_dict(b'', (99.1,), 100)
with self.assertRaises(ValueError):
_zstd.train_dict(b'abc', (4, -1), 100)
with self.assertRaises(ValueError):
_zstd.train_dict(b'abc', (2,), 100)
with self.assertRaises(ValueError):
_zstd.train_dict(b'', (99,), 100)

# size > size_t
with self.assertRaises(ValueError):
_zstd.train_dict(b'', (2**64+1,), 100)
_zstd.train_dict(b'', (2**1000,), 100)
with self.assertRaises(ValueError):
_zstd.train_dict(b'', (-2**1000,), 100)

# dict_size <= 0
with self.assertRaises(ValueError):
_zstd.train_dict(b'', (), 0)
with self.assertRaises(ValueError):
_zstd.train_dict(b'', (), -1)

with self.assertRaises(ZstdError):
_zstd.train_dict(b'', (), 1)

def test_finalize_dict_c(self):
with self.assertRaises(TypeError):
Expand All @@ -1259,22 +1292,51 @@ def test_finalize_dict_c(self):
# argument wrong type
with self.assertRaises(TypeError):
_zstd.finalize_dict({}, b'', (), 100, 5)
with self.assertRaises(TypeError):
_zstd.finalize_dict(bytearray(TRAINED_DICT.dict_content), b'', (), 100, 5)
with self.assertRaises(TypeError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, {}, (), 100, 5)
with self.assertRaises(TypeError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, bytearray(), (), 100, 5)
with self.assertRaises(TypeError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', 99, 100, 5)
with self.assertRaises(TypeError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', [], 100, 5)
with self.assertRaises(TypeError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (), 100.1, 5)
with self.assertRaises(TypeError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (), 100, 5.1)

with self.assertRaises(ValueError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'abc', (4, -1), 100, 5)
with self.assertRaises(ValueError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'abc', (2,), 100, 5)
with self.assertRaises(ValueError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (99,), 100, 5)

# size > size_t
with self.assertRaises(ValueError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (2**64+1,), 100, 5)
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (2**1000,), 100, 5)
with self.assertRaises(ValueError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (-2**1000,), 100, 5)

# dict_size <= 0
with self.assertRaises(ValueError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (), 0, 5)
with self.assertRaises(ValueError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (), -1, 5)
with self.assertRaises(OverflowError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (), 2**1000, 5)
with self.assertRaises(OverflowError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (), -2**1000, 5)

with self.assertRaises(OverflowError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (), 100, 2**1000)
with self.assertRaises(OverflowError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (), 100, -2**1000)

with self.assertRaises(ZstdError):
_zstd.finalize_dict(TRAINED_DICT.dict_content, b'', (), 100, 5)

def test_train_buffer_protocol_samples(self):
def _nbytes(dat):
Expand Down
87 changes: 60 additions & 27 deletions Modules/_zstd/_zstdmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,6 @@
#include "Python.h"

#include "_zstdmodule.h"
#include "zstddict.h"

#include <zstd.h> // ZSTD_*()
#include <zdict.h> // ZDICT_*()
Expand All @@ -20,14 +19,52 @@ module _zstd
#include "clinic/_zstdmodule.c.h"


ZstdDict *
_Py_parse_zstd_dict(const _zstd_state *state, PyObject *dict, int *ptype)
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{
if (state == NULL) {
return NULL;
}

/* Check ZstdDict */
if (PyObject_TypeCheck(dict, state->ZstdDict_type)) {
return (ZstdDict*)dict;
}

/* Check (ZstdDict, type) */
if (PyTuple_CheckExact(dict) && PyTuple_GET_SIZE(dict) == 2
&& PyObject_TypeCheck(PyTuple_GET_ITEM(dict, 0), state->ZstdDict_type)
&& PyLong_Check(PyTuple_GET_ITEM(dict, 1)))
{
int type = PyLong_AsInt(PyTuple_GET_ITEM(dict, 1));
if (type == -1 && PyErr_Occurred()) {
return NULL;
}
if (type == DICT_TYPE_DIGESTED
|| type == DICT_TYPE_UNDIGESTED
|| type == DICT_TYPE_PREFIX)
{
*ptype = type;
return (ZstdDict*)PyTuple_GET_ITEM(dict, 0);
}
}

/* Wrong type */
PyErr_SetString(PyExc_TypeError,
"zstd_dict argument should be a ZstdDict object.");
return NULL;
}

/* Format error message and set ZstdError. */
void
set_zstd_error(const _zstd_state* const state,
error_type type, size_t zstd_ret)
set_zstd_error(const _zstd_state *state, error_type type, size_t zstd_ret)
{
char *msg;
const char *msg;
assert(ZSTD_isError(zstd_ret));

if (state == NULL) {
return;
}
switch (type) {
case ERR_DECOMPRESS:
msg = "Unable to decompress Zstandard data: %s";
Expand Down Expand Up @@ -174,7 +211,7 @@ calculate_samples_stats(PyBytesObject *samples_bytes, PyObject *samples_sizes,
Py_ssize_t sizes_sum;
Py_ssize_t i;

chunks_number = Py_SIZE(samples_sizes);
chunks_number = PyTuple_GET_SIZE(samples_sizes);
if ((size_t) chunks_number > UINT32_MAX) {
PyErr_Format(PyExc_ValueError,
"The number of samples should be <= %u.", UINT32_MAX);
Expand All @@ -188,20 +225,24 @@ calculate_samples_stats(PyBytesObject *samples_bytes, PyObject *samples_sizes,
return -1;
}

sizes_sum = 0;
sizes_sum = PyBytes_GET_SIZE(samples_bytes);
for (i = 0; i < chunks_number; i++) {
PyObject *size = PyTuple_GetItem(samples_sizes, i);
(*chunk_sizes)[i] = PyLong_AsSize_t(size);
if ((*chunk_sizes)[i] == (size_t)-1 && PyErr_Occurred()) {
PyErr_Format(PyExc_ValueError,
"Items in samples_sizes should be an int "
"object, with a value between 0 and %u.", SIZE_MAX);
size_t size = PyLong_AsSize_t(PyTuple_GET_ITEM(samples_sizes, i));
(*chunk_sizes)[i] = size;
if (size == (size_t)-1 && PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_OverflowError)) {
goto sum_error;
}
return -1;
}
sizes_sum += (*chunk_sizes)[i];
if ((size_t)sizes_sum < size) {
goto sum_error;
}
sizes_sum -= size;
}

if (sizes_sum != Py_SIZE(samples_bytes)) {
if (sizes_sum != 0) {
sum_error:
PyErr_SetString(PyExc_ValueError,
"The samples size tuple doesn't match the "
"concatenation's size.");
Expand Down Expand Up @@ -257,7 +298,7 @@ _zstd_train_dict_impl(PyObject *module, PyBytesObject *samples_bytes,

/* Train the dictionary */
char *dst_dict_buffer = PyBytes_AS_STRING(dst_dict_bytes);
char *samples_buffer = PyBytes_AS_STRING(samples_bytes);
const char *samples_buffer = PyBytes_AS_STRING(samples_bytes);
Py_BEGIN_ALLOW_THREADS
zstd_ret = ZDICT_trainFromBuffer(dst_dict_buffer, dict_size,
samples_buffer,
Expand Down Expand Up @@ -507,17 +548,10 @@ _zstd_set_parameter_types_impl(PyObject *module, PyObject *c_parameter_type,
{
_zstd_state* mod_state = get_zstd_state(module);

if (!PyType_Check(c_parameter_type) || !PyType_Check(d_parameter_type)) {
PyErr_SetString(PyExc_ValueError,
"The two arguments should be CompressionParameter and "
"DecompressionParameter types.");
return NULL;
}
Comment on lines -510 to -515

AA-Turner May 31, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

Sanity check on removing the type checks here?

emmatyping May 31, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

The type checks are already handled by argument clinic, so these are actually redundant.

Py_XSETREF(
mod_state->CParameter_type, (PyTypeObject*)Py_NewRef(c_parameter_type));
Py_XSETREF(
mod_state->DParameter_type, (PyTypeObject*)Py_NewRef(d_parameter_type));
Py_INCREF(c_parameter_type);
Py_XSETREF(mod_state->CParameter_type, (PyTypeObject*)c_parameter_type);
Py_INCREF(d_parameter_type);
Py_XSETREF(mod_state->DParameter_type, (PyTypeObject*)d_parameter_type);

Py_RETURN_NONE;
}
Expand Down Expand Up @@ -580,7 +614,6 @@ do { \
return -1;
}
if (PyModule_AddType(m, (PyTypeObject *)mod_state->ZstdError) < 0) {
Py_DECREF(mod_state->ZstdError);
return -1;
}

Expand Down
10 changes: 8 additions & 2 deletions Modules/_zstd/_zstdmodule.h
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,8 @@
#ifndef ZSTD_MODULE_H
#define ZSTD_MODULE_H

#include "zstddict.h"

/* Type specs */
extern PyType_Spec zstd_dict_type_spec;
extern PyType_Spec zstd_compressor_type_spec;
Expand Down Expand Up @@ -43,10 +45,14 @@ typedef enum {
DICT_TYPE_PREFIX = 2
} dictionary_type;

extern ZstdDict *
_Py_parse_zstd_dict(const _zstd_state *state,
PyObject *dict, int *type);

/* Format error message and set ZstdError. */
extern void
set_zstd_error(const _zstd_state* const state,
const error_type type, size_t zstd_ret);
set_zstd_error(const _zstd_state *state,
error_type type, size_t zstd_ret);

extern void
set_parameter_error(int is_compress, int key_v, int value_v);
Expand Down
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