Fix for catestrophic errors in previous checkin (Argument Clinic rollup patch).

1 files changed, 1389 insertions, 0 deletions

diff --git a/Modules/_lzmamodule.c b/Modules/_lzmamodule.c
new file mode 100644
index 0000000000..56a3942c76
--- /dev/null
+++ b/Modules/_lzmamodule.c
@@ -0,0 +1,1389 @@
+/* _lzma - Low-level Python interface to liblzma.
+
+   Initial implementation by Per Øyvind Karlsen.
+   Rewritten by Nadeem Vawda.
+
+*/
+
+#define PY_SSIZE_T_CLEAN
+
+#include "Python.h"
+#include "structmember.h"
+#ifdef WITH_THREAD
+#include "pythread.h"
+#endif
+
+#include <stdarg.h>
+#include <string.h>
+
+#include <lzma.h>
+
+
+#ifndef PY_LONG_LONG
+#error "This module requires PY_LONG_LONG to be defined"
+#endif
+
+
+#ifdef WITH_THREAD
+#define ACQUIRE_LOCK(obj) do { \
+    if (!PyThread_acquire_lock((obj)->lock, 0)) { \
+        Py_BEGIN_ALLOW_THREADS \
+        PyThread_acquire_lock((obj)->lock, 1); \
+        Py_END_ALLOW_THREADS \
+    } } while (0)
+#define RELEASE_LOCK(obj) PyThread_release_lock((obj)->lock)
+#else
+#define ACQUIRE_LOCK(obj)
+#define RELEASE_LOCK(obj)
+#endif
+
+
+/* Container formats: */
+enum {
+    FORMAT_AUTO,
+    FORMAT_XZ,
+    FORMAT_ALONE,
+    FORMAT_RAW,
+};
+
+#define LZMA_CHECK_UNKNOWN (LZMA_CHECK_ID_MAX + 1)
+
+
+typedef struct {
+    PyObject_HEAD
+    lzma_allocator alloc;
+    lzma_stream lzs;
+    int flushed;
+#ifdef WITH_THREAD
+    PyThread_type_lock lock;
+#endif
+} Compressor;
+
+typedef struct {
+    PyObject_HEAD
+    lzma_allocator alloc;
+    lzma_stream lzs;
+    int check;
+    char eof;
+    PyObject *unused_data;
+#ifdef WITH_THREAD
+    PyThread_type_lock lock;
+#endif
+} Decompressor;
+
+/* LZMAError class object. */
+static PyObject *Error;
+
+/* An empty tuple, used by the filter specifier parsing code. */
+static PyObject *empty_tuple;
+
+
+/* Helper functions. */
+
+static int
+catch_lzma_error(lzma_ret lzret)
+{
+    switch (lzret) {
+        case LZMA_OK:
+        case LZMA_GET_CHECK:
+        case LZMA_NO_CHECK:
+        case LZMA_STREAM_END:
+            return 0;
+        case LZMA_UNSUPPORTED_CHECK:
+            PyErr_SetString(Error, "Unsupported integrity check");
+            return 1;
+        case LZMA_MEM_ERROR:
+            PyErr_NoMemory();
+            return 1;
+        case LZMA_MEMLIMIT_ERROR:
+            PyErr_SetString(Error, "Memory usage limit exceeded");
+            return 1;
+        case LZMA_FORMAT_ERROR:
+            PyErr_SetString(Error, "Input format not supported by decoder");
+            return 1;
+        case LZMA_OPTIONS_ERROR:
+            PyErr_SetString(Error, "Invalid or unsupported options");
+            return 1;
+        case LZMA_DATA_ERROR:
+            PyErr_SetString(Error, "Corrupt input data");
+            return 1;
+        case LZMA_BUF_ERROR:
+            PyErr_SetString(Error, "Insufficient buffer space");
+            return 1;
+        case LZMA_PROG_ERROR:
+            PyErr_SetString(Error, "Internal error");
+            return 1;
+        default:
+            PyErr_Format(Error, "Unrecognized error from liblzma: %d", lzret);
+            return 1;
+    }
+}
+
+static void*
+PyLzma_Malloc(void *opaque, size_t items, size_t size)
+{
+    if (items > (size_t)PY_SSIZE_T_MAX / size)
+        return NULL;
+    /* PyMem_Malloc() cannot be used:
+       the GIL is not held when lzma_code() is called */
+    return PyMem_RawMalloc(items * size);
+}
+
+static void
+PyLzma_Free(void *opaque, void *ptr)
+{
+    PyMem_RawFree(ptr);
+}
+
+#if BUFSIZ < 8192
+#define INITIAL_BUFFER_SIZE 8192
+#else
+#define INITIAL_BUFFER_SIZE BUFSIZ
+#endif
+
+static int
+grow_buffer(PyObject **buf)
+{
+    size_t size = PyBytes_GET_SIZE(*buf);
+    return _PyBytes_Resize(buf, size + (size >> 3) + 6);
+}
+
+
+/* Some custom type conversions for PyArg_ParseTupleAndKeywords(),
+   since the predefined conversion specifiers do not suit our needs:
+
+      uint32_t - the "I" (unsigned int) specifier is the right size, but
+      silently ignores overflows on conversion.
+
+      lzma_vli - the "K" (unsigned PY_LONG_LONG) specifier is the right
+      size, but like "I" it silently ignores overflows on conversion.
+
+      lzma_mode and lzma_match_finder - these are enumeration types, and
+      so the size of each is implementation-defined. Worse, different
+      enum types can be of different sizes within the same program, so
+      to be strictly correct, we need to define two separate converters.
+ */
+
+#define INT_TYPE_CONVERTER_FUNC(TYPE, FUNCNAME) \
+    static int \
+    FUNCNAME(PyObject *obj, void *ptr) \
+    { \
+        unsigned PY_LONG_LONG val; \
+        \
+        val = PyLong_AsUnsignedLongLong(obj); \
+        if (PyErr_Occurred()) \
+            return 0; \
+        if ((unsigned PY_LONG_LONG)(TYPE)val != val) { \
+            PyErr_SetString(PyExc_OverflowError, \
+                            "Value too large for " #TYPE " type"); \
+            return 0; \
+        } \
+        *(TYPE *)ptr = (TYPE)val; \
+        return 1; \
+    }
+
+INT_TYPE_CONVERTER_FUNC(uint32_t, uint32_converter)
+INT_TYPE_CONVERTER_FUNC(lzma_vli, lzma_vli_converter)
+INT_TYPE_CONVERTER_FUNC(lzma_mode, lzma_mode_converter)
+INT_TYPE_CONVERTER_FUNC(lzma_match_finder, lzma_mf_converter)
+
+#undef INT_TYPE_CONVERTER_FUNC
+
+
+/* Filter specifier parsing.
+
+   This code handles converting filter specifiers (Python dicts) into
+   the C lzma_filter structs expected by liblzma. */
+
+static void *
+parse_filter_spec_lzma(PyObject *spec)
+{
+    static char *optnames[] = {"id", "preset", "dict_size", "lc", "lp",
+                               "pb", "mode", "nice_len", "mf", "depth", NULL};
+    PyObject *id;
+    PyObject *preset_obj;
+    uint32_t preset = LZMA_PRESET_DEFAULT;
+    lzma_options_lzma *options;
+
+    /* First, fill in default values for all the options using a preset.
+       Then, override the defaults with any values given by the caller. */
+
+    preset_obj = PyMapping_GetItemString(spec, "preset");
+    if (preset_obj == NULL) {
+        if (PyErr_ExceptionMatches(PyExc_KeyError))
+            PyErr_Clear();
+        else
+            return NULL;
+    } else {
+        int ok = uint32_converter(preset_obj, &preset);
+        Py_DECREF(preset_obj);
+        if (!ok)
+            return NULL;
+    }
+
+    options = (lzma_options_lzma *)PyMem_Malloc(sizeof *options);
+    if (options == NULL)
+        return PyErr_NoMemory();
+    memset(options, 0, sizeof *options);
+
+    if (lzma_lzma_preset(options, preset)) {
+        PyMem_Free(options);
+        PyErr_Format(Error, "Invalid compression preset: %d", preset);
+        return NULL;
+    }
+
+    if (!PyArg_ParseTupleAndKeywords(empty_tuple, spec,
+                                     "|OOO&O&O&O&O&O&O&O&", optnames,
+                                     &id, &preset_obj,
+                                     uint32_converter, &options->dict_size,
+                                     uint32_converter, &options->lc,
+                                     uint32_converter, &options->lp,
+                                     uint32_converter, &options->pb,
+                                     lzma_mode_converter, &options->mode,
+                                     uint32_converter, &options->nice_len,
+                                     lzma_mf_converter, &options->mf,
+                                     uint32_converter, &options->depth)) {
+        PyErr_SetString(PyExc_ValueError,
+                        "Invalid filter specifier for LZMA filter");
+        PyMem_Free(options);
+        options = NULL;
+    }
+    return options;
+}
+
+static void *
+parse_filter_spec_delta(PyObject *spec)
+{
+    static char *optnames[] = {"id", "dist", NULL};
+    PyObject *id;
+    uint32_t dist = 1;
+    lzma_options_delta *options;
+
+    if (!PyArg_ParseTupleAndKeywords(empty_tuple, spec, "|OO&", optnames,
+                                     &id, uint32_converter, &dist)) {
+        PyErr_SetString(PyExc_ValueError,
+                        "Invalid filter specifier for delta filter");
+        return NULL;
+    }
+
+    options = (lzma_options_delta *)PyMem_Malloc(sizeof *options);
+    if (options == NULL)
+        return PyErr_NoMemory();
+    memset(options, 0, sizeof *options);
+    options->type = LZMA_DELTA_TYPE_BYTE;
+    options->dist = dist;
+    return options;
+}
+
+static void *
+parse_filter_spec_bcj(PyObject *spec)
+{
+    static char *optnames[] = {"id", "start_offset", NULL};
+    PyObject *id;
+    uint32_t start_offset = 0;
+    lzma_options_bcj *options;
+
+    if (!PyArg_ParseTupleAndKeywords(empty_tuple, spec, "|OO&", optnames,
+                                     &id, uint32_converter, &start_offset)) {
+        PyErr_SetString(PyExc_ValueError,
+                        "Invalid filter specifier for BCJ filter");
+        return NULL;
+    }
+
+    options = (lzma_options_bcj *)PyMem_Malloc(sizeof *options);
+    if (options == NULL)
+        return PyErr_NoMemory();
+    memset(options, 0, sizeof *options);
+    options->start_offset = start_offset;
+    return options;
+}
+
+static int
+lzma_filter_converter(PyObject *spec, void *ptr)
+{
+    lzma_filter *f = (lzma_filter *)ptr;
+    PyObject *id_obj;
+
+    if (!PyMapping_Check(spec)) {
+        PyErr_SetString(PyExc_TypeError,
+                        "Filter specifier must be a dict or dict-like object");
+        return 0;
+    }
+    id_obj = PyMapping_GetItemString(spec, "id");
+    if (id_obj == NULL) {
+        if (PyErr_ExceptionMatches(PyExc_KeyError))
+            PyErr_SetString(PyExc_ValueError,
+                            "Filter specifier must have an \"id\" entry");
+        return 0;
+    }
+    f->id = PyLong_AsUnsignedLongLong(id_obj);
+    Py_DECREF(id_obj);
+    if (PyErr_Occurred())
+        return 0;
+
+    switch (f->id) {
+        case LZMA_FILTER_LZMA1:
+        case LZMA_FILTER_LZMA2:
+            f->options = parse_filter_spec_lzma(spec);
+            return f->options != NULL;
+        case LZMA_FILTER_DELTA:
+            f->options = parse_filter_spec_delta(spec);
+            return f->options != NULL;
+        case LZMA_FILTER_X86:
+        case LZMA_FILTER_POWERPC:
+        case LZMA_FILTER_IA64:
+        case LZMA_FILTER_ARM:
+        case LZMA_FILTER_ARMTHUMB:
+        case LZMA_FILTER_SPARC:
+            f->options = parse_filter_spec_bcj(spec);
+            return f->options != NULL;
+        default:
+            PyErr_Format(PyExc_ValueError, "Invalid filter ID: %llu", f->id);
+            return 0;
+    }
+}
+
+static void
+free_filter_chain(lzma_filter filters[])
+{
+    int i;
+
+    for (i = 0; filters[i].id != LZMA_VLI_UNKNOWN; i++)
+        PyMem_Free(filters[i].options);
+}
+
+static int
+parse_filter_chain_spec(lzma_filter filters[], PyObject *filterspecs)
+{
+    Py_ssize_t i, num_filters;
+
+    num_filters = PySequence_Length(filterspecs);
+    if (num_filters == -1)
+        return -1;
+    if (num_filters > LZMA_FILTERS_MAX) {
+        PyErr_Format(PyExc_ValueError,
+                     "Too many filters - liblzma supports a maximum of %d",
+                     LZMA_FILTERS_MAX);
+        return -1;
+    }
+
+    for (i = 0; i < num_filters; i++) {
+        int ok = 1;
+        PyObject *spec = PySequence_GetItem(filterspecs, i);
+        if (spec == NULL || !lzma_filter_converter(spec, &filters[i]))
+            ok = 0;
+        Py_XDECREF(spec);
+        if (!ok) {
+            filters[i].id = LZMA_VLI_UNKNOWN;
+            free_filter_chain(filters);
+            return -1;
+        }
+    }
+    filters[num_filters].id = LZMA_VLI_UNKNOWN;
+    return 0;
+}
+
+
+/* Filter specifier construction.
+
+   This code handles converting C lzma_filter structs into
+   Python-level filter specifiers (represented as dicts). */
+
+static int
+spec_add_field(PyObject *spec, _Py_Identifier *key, unsigned PY_LONG_LONG value)
+{
+    int status;
+    PyObject *value_object;
+
+    value_object = PyLong_FromUnsignedLongLong(value);
+    if (value_object == NULL)
+        return -1;
+
+    status = _PyDict_SetItemId(spec, key, value_object);
+    Py_DECREF(value_object);
+    return status;
+}
+
+static PyObject *
+build_filter_spec(const lzma_filter *f)
+{
+    PyObject *spec;
+
+    spec = PyDict_New();
+    if (spec == NULL)
+        return NULL;
+
+#define ADD_FIELD(SOURCE, FIELD) \
+    do { \
+        _Py_IDENTIFIER(FIELD); \
+        if (spec_add_field(spec, &PyId_##FIELD, SOURCE->FIELD) == -1) \
+            goto error;\
+    } while (0)
+
+    ADD_FIELD(f, id);
+
+    switch (f->id) {
+        /* For LZMA1 filters, lzma_properties_{encode,decode}() only look at the
+           lc, lp, pb, and dict_size fields. For LZMA2 filters, only the
+           dict_size field is used. */
+        case LZMA_FILTER_LZMA1: {
+            lzma_options_lzma *options = f->options;
+            ADD_FIELD(options, lc);
+            ADD_FIELD(options, lp);
+            ADD_FIELD(options, pb);
+            ADD_FIELD(options, dict_size);
+            break;
+        }
+        case LZMA_FILTER_LZMA2: {
+            lzma_options_lzma *options = f->options;
+            ADD_FIELD(options, dict_size);
+            break;
+        }
+        case LZMA_FILTER_DELTA: {
+            lzma_options_delta *options = f->options;
+            ADD_FIELD(options, dist);
+            break;
+        }
+        case LZMA_FILTER_X86:
+        case LZMA_FILTER_POWERPC:
+        case LZMA_FILTER_IA64:
+        case LZMA_FILTER_ARM:
+        case LZMA_FILTER_ARMTHUMB:
+        case LZMA_FILTER_SPARC: {
+            lzma_options_bcj *options = f->options;
+            ADD_FIELD(options, start_offset);
+            break;
+        }
+        default:
+            PyErr_Format(PyExc_ValueError, "Invalid filter ID: %llu", f->id);
+            goto error;
+    }
+
+#undef ADD_FIELD
+
+    return spec;
+
+error:
+    Py_DECREF(spec);
+    return NULL;
+}
+
+
+/*[clinic input]
+output preset file
+module _lzma
+class _lzma.LZMACompressor "Compressor *" "&Compressor_type"
+class _lzma.LZMADecompressor "Decompressor *" "&Decompressor_type"
+[clinic start generated code]*/
+/*[clinic end generated code: checksum=da39a3ee5e6b4b0d3255bfef95601890afd80709]*/
+
+#include "clinic/_lzmamodule.c.h"
+
+/*[python input]
+
+class lzma_vli_converter(CConverter):
+    type = 'lzma_vli'
+    converter = 'lzma_vli_converter'
+
+class lzma_filter_converter(CConverter):
+    type = 'lzma_filter'
+    converter = 'lzma_filter_converter'
+    c_default = c_ignored_default = "{LZMA_VLI_UNKNOWN, NULL}"
+
+    def cleanup(self):
+        name = ensure_legal_c_identifier(self.name)
+        return ('if (%(name)s.id != LZMA_VLI_UNKNOWN)\n'
+                '   PyMem_Free(%(name)s.options);\n') % {'name': name}
+
+[python start generated code]*/
+/*[python end generated code: checksum=da39a3ee5e6b4b0d3255bfef95601890afd80709]*/
+
+
+/* LZMACompressor class. */
+
+static PyObject *
+compress(Compressor *c, uint8_t *data, size_t len, lzma_action action)
+{
+    size_t data_size = 0;
+    PyObject *result;
+
+    result = PyBytes_FromStringAndSize(NULL, INITIAL_BUFFER_SIZE);
+    if (result == NULL)
+        return NULL;
+    c->lzs.next_in = data;
+    c->lzs.avail_in = len;
+    c->lzs.next_out = (uint8_t *)PyBytes_AS_STRING(result);
+    c->lzs.avail_out = PyBytes_GET_SIZE(result);
+    for (;;) {
+        lzma_ret lzret;
+
+        Py_BEGIN_ALLOW_THREADS
+        lzret = lzma_code(&c->lzs, action);
+        data_size = (char *)c->lzs.next_out - PyBytes_AS_STRING(result);
+        Py_END_ALLOW_THREADS
+        if (catch_lzma_error(lzret))
+            goto error;
+        if ((action == LZMA_RUN && c->lzs.avail_in == 0) ||
+            (action == LZMA_FINISH && lzret == LZMA_STREAM_END)) {
+            break;
+        } else if (c->lzs.avail_out == 0) {
+            if (grow_buffer(&result) == -1)
+                goto error;
+            c->lzs.next_out = (uint8_t *)PyBytes_AS_STRING(result) + data_size;
+            c->lzs.avail_out = PyBytes_GET_SIZE(result) - data_size;
+        }
+    }
+    if (data_size != PyBytes_GET_SIZE(result))
+        if (_PyBytes_Resize(&result, data_size) == -1)
+            goto error;
+    return result;
+
+error:
+    Py_XDECREF(result);
+    return NULL;
+}
+
+/*[clinic input]
+_lzma.LZMACompressor.compress
+
+    self: self(type="Compressor *")
+    data: Py_buffer
+    /
+
+Provide data to the compressor object.
+
+Returns a chunk of compressed data if possible, or b'' otherwise.
+
+When you have finished providing data to the compressor, call the
+flush() method to finish the compression process.
+[clinic start generated code]*/
+
+static PyObject *
+_lzma_LZMACompressor_compress_impl(Compressor *self, Py_buffer *data)
+/*[clinic end generated code: checksum=31f615136963e00f26f8be33440ec1e3604565ba]*/
+{
+    PyObject *result = NULL;
+
+    ACQUIRE_LOCK(self);
+    if (self->flushed)
+        PyErr_SetString(PyExc_ValueError, "Compressor has been flushed");
+    else
+        result = compress(self, data->buf, data->len, LZMA_RUN);
+    RELEASE_LOCK(self);
+    return result;
+}
+
+/*[clinic input]
+_lzma.LZMACompressor.flush
+
+    self: self(type="Compressor *")
+
+Finish the compression process.
+
+Returns the compressed data left in internal buffers.
+
+The compressor object may not be used after this method is called.
+[clinic start generated code]*/
+
+static PyObject *
+_lzma_LZMACompressor_flush_impl(Compressor *self)
+/*[clinic end generated code: checksum=fec21f3e22504f500606ba60e1ba70d79eb22188]*/
+{
+    PyObject *result = NULL;
+
+    ACQUIRE_LOCK(self);
+    if (self->flushed) {
+        PyErr_SetString(PyExc_ValueError, "Repeated call to flush()");
+    } else {
+        self->flushed = 1;
+        result = compress(self, NULL, 0, LZMA_FINISH);
+    }
+    RELEASE_LOCK(self);
+    return result;
+}
+
+static PyObject *
+Compressor_getstate(Compressor *self, PyObject *noargs)
+{
+    PyErr_Format(PyExc_TypeError, "cannot serialize '%s' object",
+                 Py_TYPE(self)->tp_name);
+    return NULL;
+}
+
+static int
+Compressor_init_xz(lzma_stream *lzs, int check, uint32_t preset,
+                   PyObject *filterspecs)
+{
+    lzma_ret lzret;
+
+    if (filterspecs == Py_None) {
+        lzret = lzma_easy_encoder(lzs, preset, check);
+    } else {
+        lzma_filter filters[LZMA_FILTERS_MAX + 1];
+
+        if (parse_filter_chain_spec(filters, filterspecs) == -1)
+            return -1;
+        lzret = lzma_stream_encoder(lzs, filters, check);
+        free_filter_chain(filters);
+    }
+    if (catch_lzma_error(lzret))
+        return -1;
+    else
+        return 0;
+}
+
+static int
+Compressor_init_alone(lzma_stream *lzs, uint32_t preset, PyObject *filterspecs)
+{
+    lzma_ret lzret;
+
+    if (filterspecs == Py_None) {
+        lzma_options_lzma options;
+
+        if (lzma_lzma_preset(&options, preset)) {
+            PyErr_Format(Error, "Invalid compression preset: %d", preset);
+            return -1;
+        }
+        lzret = lzma_alone_encoder(lzs, &options);
+    } else {
+        lzma_filter filters[LZMA_FILTERS_MAX + 1];
+
+        if (parse_filter_chain_spec(filters, filterspecs) == -1)
+            return -1;
+        if (filters[0].id == LZMA_FILTER_LZMA1 &&
+            filters[1].id == LZMA_VLI_UNKNOWN) {
+            lzret = lzma_alone_encoder(lzs, filters[0].options);
+        } else {
+            PyErr_SetString(PyExc_ValueError,
+                            "Invalid filter chain for FORMAT_ALONE - "
+                            "must be a single LZMA1 filter");
+            lzret = LZMA_PROG_ERROR;
+        }
+        free_filter_chain(filters);
+    }
+    if (PyErr_Occurred() || catch_lzma_error(lzret))
+        return -1;
+    else
+        return 0;
+}
+
+static int
+Compressor_init_raw(lzma_stream *lzs, PyObject *filterspecs)
+{
+    lzma_filter filters[LZMA_FILTERS_MAX + 1];
+    lzma_ret lzret;
+
+    if (filterspecs == Py_None) {
+        PyErr_SetString(PyExc_ValueError,
+                        "Must specify filters for FORMAT_RAW");
+        return -1;
+    }
+    if (parse_filter_chain_spec(filters, filterspecs) == -1)
+        return -1;
+    lzret = lzma_raw_encoder(lzs, filters);
+    free_filter_chain(filters);
+    if (catch_lzma_error(lzret))
+        return -1;
+    else
+        return 0;
+}
+
+/*[-clinic input]
+_lzma.LZMACompressor.__init__
+
+    self: self(type="Compressor *")
+    format: int(c_default="FORMAT_XZ") = FORMAT_XZ
+        The container format to use for the output.  This can
+        be FORMAT_XZ (default), FORMAT_ALONE, or FORMAT_RAW.
+
+    check: int(c_default="-1") = unspecified
+        The integrity check to use.  For FORMAT_XZ, the default
+        is CHECK_CRC64.  FORMAT_ALONE and FORMAT_RAW do not suport integrity
+        checks; for these formats, check must be omitted, or be CHECK_NONE.
+
+    preset: object = None
+        If provided should be an integer in the range 0-9, optionally
+        OR-ed with the constant PRESET_EXTREME.
+
+    filters: object = None
+        If provided should be a sequence of dicts.  Each dict should
+        have an entry for "id" indicating the ID of the filter, plus
+        additional entries for options to the filter.
+
+Create a compressor object for compressing data incrementally.
+
+The settings used by the compressor can be specified either as a
+preset compression level (with the 'preset' argument), or in detail
+as a custom filter chain (with the 'filters' argument).  For FORMAT_XZ
+and FORMAT_ALONE, the default is to use the PRESET_DEFAULT preset
+level.  For FORMAT_RAW, the caller must always specify a filter chain;
+the raw compressor does not support preset compression levels.
+
+For one-shot compression, use the compress() function instead.
+[-clinic start generated code]*/
+static int
+Compressor_init(Compressor *self, PyObject *args, PyObject *kwargs)
+{
+    static char *arg_names[] = {"format", "check", "preset", "filters", NULL};
+    int format = FORMAT_XZ;
+    int check = -1;
+    uint32_t preset = LZMA_PRESET_DEFAULT;
+    PyObject *preset_obj = Py_None;
+    PyObject *filterspecs = Py_None;
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs,
+                                     "|iiOO:LZMACompressor", arg_names,
+                                     &format, &check, &preset_obj,
+                                     &filterspecs))
+        return -1;
+
+    if (format != FORMAT_XZ && check != -1 && check != LZMA_CHECK_NONE) {
+        PyErr_SetString(PyExc_ValueError,
+                        "Integrity checks are only supported by FORMAT_XZ");
+        return -1;
+    }
+
+    if (preset_obj != Py_None && filterspecs != Py_None) {
+        PyErr_SetString(PyExc_ValueError,
+                        "Cannot specify both preset and filter chain");
+        return -1;
+    }
+
+    if (preset_obj != Py_None)
+        if (!uint32_converter(preset_obj, &preset))
+            return -1;
+
+    self->alloc.opaque = NULL;
+    self->alloc.alloc = PyLzma_Malloc;
+    self->alloc.free = PyLzma_Free;
+    self->lzs.allocator = &self->alloc;
+
+#ifdef WITH_THREAD
+    self->lock = PyThread_allocate_lock();
+    if (self->lock == NULL) {
+        PyErr_SetString(PyExc_MemoryError, "Unable to allocate lock");
+        return -1;
+    }
+#endif
+
+    self->flushed = 0;
+    switch (format) {
+        case FORMAT_XZ:
+            if (check == -1)
+                check = LZMA_CHECK_CRC64;
+            if (Compressor_init_xz(&self->lzs, check, preset, filterspecs) != 0)
+                break;
+            return 0;
+
+        case FORMAT_ALONE:
+            if (Compressor_init_alone(&self->lzs, preset, filterspecs) != 0)
+                break;
+            return 0;
+
+        case FORMAT_RAW:
+            if (Compressor_init_raw(&self->lzs, filterspecs) != 0)
+                break;
+            return 0;
+
+        default:
+            PyErr_Format(PyExc_ValueError,
+                         "Invalid container format: %d", format);
+            break;
+    }
+
+#ifdef WITH_THREAD
+    PyThread_free_lock(self->lock);
+    self->lock = NULL;
+#endif
+    return -1;
+}
+
+static void
+Compressor_dealloc(Compressor *self)
+{
+    lzma_end(&self->lzs);
+#ifdef WITH_THREAD
+    if (self->lock != NULL)
+        PyThread_free_lock(self->lock);
+#endif
+    Py_TYPE(self)->tp_free((PyObject *)self);
+}
+
+static PyMethodDef Compressor_methods[] = {
+    _LZMA_LZMACOMPRESSOR_COMPRESS_METHODDEF
+    _LZMA_LZMACOMPRESSOR_FLUSH_METHODDEF
+    {"__getstate__", (PyCFunction)Compressor_getstate, METH_NOARGS},
+    {NULL}
+};
+
+PyDoc_STRVAR(Compressor_doc,
+"LZMACompressor(format=FORMAT_XZ, check=-1, preset=None, filters=None)\n"
+"\n"
+"Create a compressor object for compressing data incrementally.\n"
+"\n"
+"format specifies the container format to use for the output. This can\n"
+"be FORMAT_XZ (default), FORMAT_ALONE, or FORMAT_RAW.\n"
+"\n"
+"check specifies the integrity check to use. For FORMAT_XZ, the default\n"
+"is CHECK_CRC64. FORMAT_ALONE and FORMAT_RAW do not suport integrity\n"
+"checks; for these formats, check must be omitted, or be CHECK_NONE.\n"
+"\n"
+"The settings used by the compressor can be specified either as a\n"
+"preset compression level (with the 'preset' argument), or in detail\n"
+"as a custom filter chain (with the 'filters' argument). For FORMAT_XZ\n"
+"and FORMAT_ALONE, the default is to use the PRESET_DEFAULT preset\n"
+"level. For FORMAT_RAW, the caller must always specify a filter chain;\n"
+"the raw compressor does not support preset compression levels.\n"
+"\n"
+"preset (if provided) should be an integer in the range 0-9, optionally\n"
+"OR-ed with the constant PRESET_EXTREME.\n"
+"\n"
+"filters (if provided) should be a sequence of dicts. Each dict should\n"
+"have an entry for \"id\" indicating the ID of the filter, plus\n"
+"additional entries for options to the filter.\n"
+"\n"
+"For one-shot compression, use the compress() function instead.\n");
+
+static PyTypeObject Compressor_type = {
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "_lzma.LZMACompressor",             /* tp_name */
+    sizeof(Compressor),                 /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    (destructor)Compressor_dealloc,     /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_reserved */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* 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 */
+    Compressor_doc,                     /* tp_doc */
+    0,                                  /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    0,                                  /* tp_iter */
+    0,                                  /* tp_iternext */
+    Compressor_methods,                 /* 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 */
+    (initproc)Compressor_init,          /* tp_init */
+    0,                                  /* tp_alloc */
+    PyType_GenericNew,                  /* tp_new */
+};
+
+
+/* LZMADecompressor class. */
+
+static PyObject *
+decompress(Decompressor *d, uint8_t *data, size_t len)
+{
+    size_t data_size = 0;
+    PyObject *result;
+
+    result = PyBytes_FromStringAndSize(NULL, INITIAL_BUFFER_SIZE);
+    if (result == NULL)
+        return NULL;
+    d->lzs.next_in = data;
+    d->lzs.avail_in = len;
+    d->lzs.next_out = (uint8_t *)PyBytes_AS_STRING(result);
+    d->lzs.avail_out = PyBytes_GET_SIZE(result);
+    for (;;) {
+        lzma_ret lzret;
+
+        Py_BEGIN_ALLOW_THREADS
+        lzret = lzma_code(&d->lzs, LZMA_RUN);
+        data_size = (char *)d->lzs.next_out - PyBytes_AS_STRING(result);
+        Py_END_ALLOW_THREADS
+        if (catch_lzma_error(lzret))
+            goto error;
+        if (lzret == LZMA_GET_CHECK || lzret == LZMA_NO_CHECK)
+            d->check = lzma_get_check(&d->lzs);
+        if (lzret == LZMA_STREAM_END) {
+            d->eof = 1;
+            if (d->lzs.avail_in > 0) {
+                Py_CLEAR(d->unused_data);
+                d->unused_data = PyBytes_FromStringAndSize(
+                        (char *)d->lzs.next_in, d->lzs.avail_in);
+                if (d->unused_data == NULL)
+                    goto error;
+            }
+            break;
+        } else if (d->lzs.avail_in == 0) {
+            break;
+        } else if (d->lzs.avail_out == 0) {
+            if (grow_buffer(&result) == -1)
+                goto error;
+            d->lzs.next_out = (uint8_t *)PyBytes_AS_STRING(result) + data_size;
+            d->lzs.avail_out = PyBytes_GET_SIZE(result) - data_size;
+        }
+    }
+    if (data_size != PyBytes_GET_SIZE(result))
+        if (_PyBytes_Resize(&result, data_size) == -1)
+            goto error;
+    return result;
+
+error:
+    Py_XDECREF(result);
+    return NULL;
+}
+
+/*[clinic input]
+_lzma.LZMADecompressor.decompress
+
+    self: self(type="Decompressor *")
+    data: Py_buffer
+    /
+
+Provide data to the decompressor object.
+
+Returns a chunk of decompressed data if possible, or b'' otherwise.
+
+Attempting to decompress data after the end of stream is reached
+raises an EOFError.  Any data found after the end of the stream
+is ignored and saved in the unused_data attribute.
+[clinic start generated code]*/
+
+static PyObject *
+_lzma_LZMADecompressor_decompress_impl(Decompressor *self, Py_buffer *data)
+/*[clinic end generated code: checksum=d86e78da7ff0ff219d511275b16b79476da8922e]*/
+{
+    PyObject *result = NULL;
+
+    ACQUIRE_LOCK(self);
+    if (self->eof)
+        PyErr_SetString(PyExc_EOFError, "Already at end of stream");
+    else
+        result = decompress(self, data->buf, data->len);
+    RELEASE_LOCK(self);
+    return result;
+}
+
+static PyObject *
+Decompressor_getstate(Decompressor *self, PyObject *noargs)
+{
+    PyErr_Format(PyExc_TypeError, "cannot serialize '%s' object",
+                 Py_TYPE(self)->tp_name);
+    return NULL;
+}
+
+static int
+Decompressor_init_raw(lzma_stream *lzs, PyObject *filterspecs)
+{
+    lzma_filter filters[LZMA_FILTERS_MAX + 1];
+    lzma_ret lzret;
+
+    if (parse_filter_chain_spec(filters, filterspecs) == -1)
+        return -1;
+    lzret = lzma_raw_decoder(lzs, filters);
+    free_filter_chain(filters);
+    if (catch_lzma_error(lzret))
+        return -1;
+    else
+        return 0;
+}
+
+/*[clinic input]
+_lzma.LZMADecompressor.__init__
+
+    self: self(type="Decompressor *")
+    format: int(c_default="FORMAT_AUTO") = FORMAT_AUTO
+        Specifies the container format of the input stream.  If this is
+        FORMAT_AUTO (the default), the decompressor will automatically detect
+        whether the input is FORMAT_XZ or FORMAT_ALONE.  Streams created with
+        FORMAT_RAW cannot be autodetected.
+
+    memlimit: object = None
+        Limit the amount of memory used by the decompressor.  This will cause
+        decompression to fail if the input cannot be decompressed within the
+        given limit.
+
+    filters: object = None
+        A custom filter chain.  This argument is required for FORMAT_RAW, and
+        not accepted with any other format.  When provided, this should be a
+        sequence of dicts, each indicating the ID and options for a single
+        filter.
+
+Create a decompressor object for decompressing data incrementally.
+
+For one-shot decompression, use the decompress() function instead.
+[clinic start generated code]*/
+
+static int
+_lzma_LZMADecompressor___init___impl(Decompressor *self, int format, PyObject *memlimit, PyObject *filters)
+/*[clinic end generated code: checksum=9b119f6f2cc2d7a8e5be41c164a6c080ee82d0c2]*/
+{
+    const uint32_t decoder_flags = LZMA_TELL_ANY_CHECK | LZMA_TELL_NO_CHECK;
+    uint64_t memlimit_ = UINT64_MAX;
+    lzma_ret lzret;
+
+    if (memlimit != Py_None) {
+        if (format == FORMAT_RAW) {
+            PyErr_SetString(PyExc_ValueError,
+                            "Cannot specify memory limit with FORMAT_RAW");
+            return -1;
+        }
+        memlimit_ = PyLong_AsUnsignedLongLong(memlimit);
+        if (PyErr_Occurred())
+            return -1;
+    }
+
+    if (format == FORMAT_RAW && filters == Py_None) {
+        PyErr_SetString(PyExc_ValueError,
+                        "Must specify filters for FORMAT_RAW");
+        return -1;
+    } else if (format != FORMAT_RAW && filters != Py_None) {
+        PyErr_SetString(PyExc_ValueError,
+                        "Cannot specify filters except with FORMAT_RAW");
+        return -1;
+    }
+
+    self->alloc.opaque = NULL;
+    self->alloc.alloc = PyLzma_Malloc;
+    self->alloc.free = PyLzma_Free;
+    self->lzs.allocator = &self->alloc;
+
+#ifdef WITH_THREAD
+    self->lock = PyThread_allocate_lock();
+    if (self->lock == NULL) {
+        PyErr_SetString(PyExc_MemoryError, "Unable to allocate lock");
+        return -1;
+    }
+#endif
+
+    self->check = LZMA_CHECK_UNKNOWN;
+    self->unused_data = PyBytes_FromStringAndSize(NULL, 0);
+    if (self->unused_data == NULL)
+        goto error;
+
+    switch (format) {
+        case FORMAT_AUTO:
+            lzret = lzma_auto_decoder(&self->lzs, memlimit_, decoder_flags);
+            if (catch_lzma_error(lzret))
+                break;
+            return 0;
+
+        case FORMAT_XZ:
+            lzret = lzma_stream_decoder(&self->lzs, memlimit_, decoder_flags);
+            if (catch_lzma_error(lzret))
+                break;
+            return 0;
+
+        case FORMAT_ALONE:
+            self->check = LZMA_CHECK_NONE;
+            lzret = lzma_alone_decoder(&self->lzs, memlimit_);
+            if (catch_lzma_error(lzret))
+                break;
+            return 0;
+
+        case FORMAT_RAW:
+            self->check = LZMA_CHECK_NONE;
+            if (Decompressor_init_raw(&self->lzs, filters) == -1)
+                break;
+            return 0;
+
+        default:
+            PyErr_Format(PyExc_ValueError,
+                         "Invalid container format: %d", format);
+            break;
+    }
+
+error:
+    Py_CLEAR(self->unused_data);
+#ifdef WITH_THREAD
+    PyThread_free_lock(self->lock);
+    self->lock = NULL;
+#endif
+    return -1;
+}
+
+static void
+Decompressor_dealloc(Decompressor *self)
+{
+    lzma_end(&self->lzs);
+    Py_CLEAR(self->unused_data);
+#ifdef WITH_THREAD
+    if (self->lock != NULL)
+        PyThread_free_lock(self->lock);
+#endif
+    Py_TYPE(self)->tp_free((PyObject *)self);
+}
+
+static PyMethodDef Decompressor_methods[] = {
+    _LZMA_LZMADECOMPRESSOR_DECOMPRESS_METHODDEF
+    {"__getstate__", (PyCFunction)Decompressor_getstate, METH_NOARGS},
+    {NULL}
+};
+
+PyDoc_STRVAR(Decompressor_check_doc,
+"ID of the integrity check used by the input stream.");
+
+PyDoc_STRVAR(Decompressor_eof_doc,
+"True if the end-of-stream marker has been reached.");
+
+PyDoc_STRVAR(Decompressor_unused_data_doc,
+"Data found after the end of the compressed stream.");
+
+static PyMemberDef Decompressor_members[] = {
+    {"check", T_INT, offsetof(Decompressor, check), READONLY,
+     Decompressor_check_doc},
+    {"eof", T_BOOL, offsetof(Decompressor, eof), READONLY,
+     Decompressor_eof_doc},
+    {"unused_data", T_OBJECT_EX, offsetof(Decompressor, unused_data), READONLY,
+     Decompressor_unused_data_doc},
+    {NULL}
+};
+
+static PyTypeObject Decompressor_type = {
+    PyVarObject_HEAD_INIT(NULL, 0)
+    "_lzma.LZMADecompressor",           /* tp_name */
+    sizeof(Decompressor),               /* tp_basicsize */
+    0,                                  /* tp_itemsize */
+    (destructor)Decompressor_dealloc,   /* tp_dealloc */
+    0,                                  /* tp_print */
+    0,                                  /* tp_getattr */
+    0,                                  /* tp_setattr */
+    0,                                  /* tp_reserved */
+    0,                                  /* tp_repr */
+    0,                                  /* tp_as_number */
+    0,                                  /* 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 */
+    _lzma_LZMADecompressor___init____doc__,  /* tp_doc */
+    0,                                  /* tp_traverse */
+    0,                                  /* tp_clear */
+    0,                                  /* tp_richcompare */
+    0,                                  /* tp_weaklistoffset */
+    0,                                  /* tp_iter */
+    0,                                  /* tp_iternext */
+    Decompressor_methods,               /* tp_methods */
+    Decompressor_members,               /* tp_members */
+    0,                                  /* tp_getset */
+    0,                                  /* tp_base */
+    0,                                  /* tp_dict */
+    0,                                  /* tp_descr_get */
+    0,                                  /* tp_descr_set */
+    0,                                  /* tp_dictoffset */
+    _lzma_LZMADecompressor___init__,    /* tp_init */
+    0,                                  /* tp_alloc */
+    PyType_GenericNew,                  /* tp_new */
+};
+
+
+/* Module-level functions. */
+
+/*[clinic input]
+_lzma.is_check_supported
+    check_id: int
+    /
+
+Test whether the given integrity check is supported.
+
+Always returns True for CHECK_NONE and CHECK_CRC32.
+[clinic start generated code]*/
+
+static PyObject *
+_lzma_is_check_supported_impl(PyModuleDef *module, int check_id)
+/*[clinic end generated code: checksum=bb828e90e00ad96ed61f66719c2fca7fde637418]*/
+{
+    return PyBool_FromLong(lzma_check_is_supported(check_id));
+}
+
+
+/*[clinic input]
+_lzma._encode_filter_properties
+    filter: lzma_filter(c_default="{LZMA_VLI_UNKNOWN, NULL}")
+    /
+
+Return a bytes object encoding the options (properties) of the filter specified by *filter* (a dict).
+
+The result does not include the filter ID itself, only the options.
+[clinic start generated code]*/
+
+static PyObject *
+_lzma__encode_filter_properties_impl(PyModuleDef *module, lzma_filter filter)
+/*[clinic end generated code: checksum=b5fe690acd6b61d1abfc32f522ada5bdcf9b13da]*/
+{
+    lzma_ret lzret;
+    uint32_t encoded_size;
+    PyObject *result = NULL;
+
+    lzret = lzma_properties_size(&encoded_size, &filter);
+    if (catch_lzma_error(lzret))
+        goto error;
+
+    result = PyBytes_FromStringAndSize(NULL, encoded_size);
+    if (result == NULL)
+        goto error;
+
+    lzret = lzma_properties_encode(
+            &filter, (uint8_t *)PyBytes_AS_STRING(result));
+    if (catch_lzma_error(lzret))
+        goto error;
+
+    return result;
+
+error:
+    Py_XDECREF(result);
+    return NULL;
+}
+
+
+/*[clinic input]
+_lzma._decode_filter_properties
+    filter_id: lzma_vli
+    encoded_props: Py_buffer
+    /
+
+Return a bytes object encoding the options (properties) of the filter specified by *filter* (a dict).
+
+The result does not include the filter ID itself, only the options.
+[clinic start generated code]*/
+
+static PyObject *
+_lzma__decode_filter_properties_impl(PyModuleDef *module, lzma_vli filter_id, Py_buffer *encoded_props)
+/*[clinic end generated code: checksum=235f7f5345d48744dcd21f781dafbbf05a717538]*/
+{
+    lzma_filter filter;
+    lzma_ret lzret;
+    PyObject *result = NULL;
+    filter.id = filter_id;
+
+    lzret = lzma_properties_decode(
+            &filter, NULL, encoded_props->buf, encoded_props->len);
+    if (catch_lzma_error(lzret))
+        return NULL;
+
+    result = build_filter_spec(&filter);
+
+    /* We use vanilla free() here instead of PyMem_Free() - filter.options was
+       allocated by lzma_properties_decode() using the default allocator. */
+    free(filter.options);
+    return result;
+}
+
+
+/* Module initialization. */
+
+static PyMethodDef module_methods[] = {
+    _LZMA_IS_CHECK_SUPPORTED_METHODDEF
+    _LZMA__ENCODE_FILTER_PROPERTIES_METHODDEF
+    _LZMA__DECODE_FILTER_PROPERTIES_METHODDEF
+    {NULL}
+};
+
+static PyModuleDef _lzmamodule = {
+    PyModuleDef_HEAD_INIT,
+    "_lzma",
+    NULL,
+    -1,
+    module_methods,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+};
+
+/* Some of our constants are more than 32 bits wide, so PyModule_AddIntConstant
+   would not work correctly on platforms with 32-bit longs. */
+static int
+module_add_int_constant(PyObject *m, const char *name, PY_LONG_LONG value)
+{
+    PyObject *o = PyLong_FromLongLong(value);
+    if (o == NULL)
+        return -1;
+    if (PyModule_AddObject(m, name, o) == 0)
+        return 0;
+    Py_DECREF(o);
+    return -1;
+}
+
+#define ADD_INT_PREFIX_MACRO(m, macro) \
+    module_add_int_constant(m, #macro, LZMA_ ## macro)
+
+PyMODINIT_FUNC
+PyInit__lzma(void)
+{
+    PyObject *m;
+
+    empty_tuple = PyTuple_New(0);
+    if (empty_tuple == NULL)
+        return NULL;
+
+    m = PyModule_Create(&_lzmamodule);
+    if (m == NULL)
+        return NULL;
+
+    if (PyModule_AddIntMacro(m, FORMAT_AUTO) == -1 ||
+        PyModule_AddIntMacro(m, FORMAT_XZ) == -1 ||
+        PyModule_AddIntMacro(m, FORMAT_ALONE) == -1 ||
+        PyModule_AddIntMacro(m, FORMAT_RAW) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, CHECK_NONE) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, CHECK_CRC32) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, CHECK_CRC64) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, CHECK_SHA256) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, CHECK_ID_MAX) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, CHECK_UNKNOWN) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, FILTER_LZMA1) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, FILTER_LZMA2) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, FILTER_DELTA) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, FILTER_X86) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, FILTER_IA64) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, FILTER_ARM) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, FILTER_ARMTHUMB) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, FILTER_SPARC) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, FILTER_POWERPC) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, MF_HC3) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, MF_HC4) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, MF_BT2) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, MF_BT3) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, MF_BT4) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, MODE_FAST) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, MODE_NORMAL) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, PRESET_DEFAULT) == -1 ||
+        ADD_INT_PREFIX_MACRO(m, PRESET_EXTREME) == -1)
+        return NULL;
+
+    Error = PyErr_NewExceptionWithDoc(
+            "_lzma.LZMAError", "Call to liblzma failed.", NULL, NULL);
+    if (Error == NULL)
+        return NULL;
+    Py_INCREF(Error);
+    if (PyModule_AddObject(m, "LZMAError", Error) == -1)
+        return NULL;
+
+    if (PyType_Ready(&Compressor_type) == -1)
+        return NULL;
+    Py_INCREF(&Compressor_type);
+    if (PyModule_AddObject(m, "LZMACompressor",
+                           (PyObject *)&Compressor_type) == -1)
+        return NULL;
+
+    if (PyType_Ready(&Decompressor_type) == -1)
+        return NULL;
+    Py_INCREF(&Decompressor_type);
+    if (PyModule_AddObject(m, "LZMADecompressor",
+                           (PyObject *)&Decompressor_type) == -1)
+        return NULL;
+
+    return m;
+}