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Copy path_lzmamodule.c
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1629 lines (1389 loc) · 48.2 KB
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/* _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" // PyMemberDef
#include <stdarg.h>
#include <string.h>
#include <lzma.h>
#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)
typedef struct {
PyTypeObject *lzma_compressor_type;
PyTypeObject *lzma_decompressor_type;
PyObject *error;
PyObject *empty_tuple;
} _lzma_state;
static inline _lzma_state*
get_lzma_state(PyObject *module)
{
void *state = PyModule_GetState(module);
assert(state != NULL);
return (_lzma_state *)state;
}
/* 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;
PyThread_type_lock lock;
} Compressor;
typedef struct {
PyObject_HEAD
lzma_allocator alloc;
lzma_stream lzs;
int check;
char eof;
PyObject *unused_data;
char needs_input;
uint8_t *input_buffer;
size_t input_buffer_size;
PyThread_type_lock lock;
} Decompressor;
/* Helper functions. */
static int
catch_lzma_error(_lzma_state *state, 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(state->error, "Unsupported integrity check");
return 1;
case LZMA_MEM_ERROR:
PyErr_NoMemory();
return 1;
case LZMA_MEMLIMIT_ERROR:
PyErr_SetString(state->error, "Memory usage limit exceeded");
return 1;
case LZMA_FORMAT_ERROR:
PyErr_SetString(state->error, "Input format not supported by decoder");
return 1;
case LZMA_OPTIONS_ERROR:
PyErr_SetString(state->error, "Invalid or unsupported options");
return 1;
case LZMA_DATA_ERROR:
PyErr_SetString(state->error, "Corrupt input data");
return 1;
case LZMA_BUF_ERROR:
PyErr_SetString(state->error, "Insufficient buffer space");
return 1;
case LZMA_PROG_ERROR:
PyErr_SetString(state->error, "Internal error");
return 1;
default:
PyErr_Format(state->error, "Unrecognized error from liblzma: %d", lzret);
return 1;
}
}
static void*
PyLzma_Malloc(void *opaque, size_t items, size_t size)
{
if (size != 0 && 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, Py_ssize_t max_length)
{
Py_ssize_t size = PyBytes_GET_SIZE(*buf);
Py_ssize_t newsize = size + (size >> 3) + 6;
if (max_length > 0 && newsize > max_length) {
newsize = max_length;
}
return _PyBytes_Resize(buf, newsize);
}
/* 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 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 long long val; \
\
val = PyLong_AsUnsignedLongLong(obj); \
if (PyErr_Occurred()) \
return 0; \
if ((unsigned 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(_lzma_state *state, 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_Calloc(1, sizeof *options);
if (options == NULL) {
return PyErr_NoMemory();
}
if (lzma_lzma_preset(options, preset)) {
PyMem_Free(options);
PyErr_Format(state->error, "Invalid compression preset: %u", preset);
return NULL;
}
if (!PyArg_ParseTupleAndKeywords(state->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);
return NULL;
}
return options;
}
static void *
parse_filter_spec_delta(_lzma_state *state, PyObject *spec)
{
static char *optnames[] = {"id", "dist", NULL};
PyObject *id;
uint32_t dist = 1;
lzma_options_delta *options;
if (!PyArg_ParseTupleAndKeywords(state->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_Calloc(1, sizeof *options);
if (options == NULL) {
return PyErr_NoMemory();
}
options->type = LZMA_DELTA_TYPE_BYTE;
options->dist = dist;
return options;
}
static void *
parse_filter_spec_bcj(_lzma_state *state, PyObject *spec)
{
static char *optnames[] = {"id", "start_offset", NULL};
PyObject *id;
uint32_t start_offset = 0;
lzma_options_bcj *options;
if (!PyArg_ParseTupleAndKeywords(state->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_Calloc(1, sizeof *options);
if (options == NULL) {
return PyErr_NoMemory();
}
options->start_offset = start_offset;
return options;
}
static int
lzma_filter_converter(_lzma_state *state, 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(state, spec);
return f->options != NULL;
case LZMA_FILTER_DELTA:
f->options = parse_filter_spec_delta(state, 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(state, 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[])
{
for (int i = 0; filters[i].id != LZMA_VLI_UNKNOWN; i++) {
PyMem_Free(filters[i].options);
}
}
static int
parse_filter_chain_spec(_lzma_state *state, 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(state, 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 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]
module _lzma
class _lzma.LZMACompressor "Compressor *" "&Compressor_type"
class _lzma.LZMADecompressor "Decompressor *" "&Decompressor_type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=2c14bbe05ff0c147]*/
#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: output=da39a3ee5e6b4b0d input=74fe7631ce377a94]*/
/* LZMACompressor class. */
static PyObject *
compress(Compressor *c, uint8_t *data, size_t len, lzma_action action)
{
Py_ssize_t data_size = 0;
PyObject *result;
_lzma_state *state = PyType_GetModuleState(Py_TYPE(c));
assert(state != NULL);
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);
if (lzret == LZMA_BUF_ERROR && len == 0 && c->lzs.avail_out > 0) {
lzret = LZMA_OK; /* That wasn't a real error */
}
Py_END_ALLOW_THREADS
if (catch_lzma_error(state, 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) == -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
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: output=31f615136963e00f input=64019eac7f2cc8d0]*/
{
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
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: output=fec21f3e22504f50 input=6b369303f67ad0a8]*/
{
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 int
Compressor_init_xz(_lzma_state *state, 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(state, filters, filterspecs) == -1)
return -1;
lzret = lzma_stream_encoder(lzs, filters, check);
free_filter_chain(filters);
}
if (catch_lzma_error(state, lzret)) {
return -1;
}
else {
return 0;
}
}
static int
Compressor_init_alone(_lzma_state *state, 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(state->error, "Invalid compression preset: %u", preset);
return -1;
}
lzret = lzma_alone_encoder(lzs, &options);
} else {
lzma_filter filters[LZMA_FILTERS_MAX + 1];
if (parse_filter_chain_spec(state, 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(state, lzret)) {
return -1;
}
else {
return 0;
}
}
static int
Compressor_init_raw(_lzma_state *state, 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(state, filters, filterspecs) == -1) {
return -1;
}
lzret = lzma_raw_encoder(lzs, filters);
free_filter_chain(filters);
if (catch_lzma_error(state, lzret)) {
return -1;
}
else {
return 0;
}
}
/*[-clinic input]
_lzma.LZMACompressor.__init__
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 support 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;
_lzma_state *state = PyType_GetModuleState(Py_TYPE(self));
assert(state != NULL);
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;
self->lock = PyThread_allocate_lock();
if (self->lock == NULL) {
PyErr_SetString(PyExc_MemoryError, "Unable to allocate lock");
return -1;
}
self->flushed = 0;
switch (format) {
case FORMAT_XZ:
if (check == -1) {
check = LZMA_CHECK_CRC64;
}
if (Compressor_init_xz(state, &self->lzs, check, preset, filterspecs) != 0) {
break;
}
return 0;
case FORMAT_ALONE:
if (Compressor_init_alone(state, &self->lzs, preset, filterspecs) != 0) {
break;
}
return 0;
case FORMAT_RAW:
if (Compressor_init_raw(state, &self->lzs, filterspecs) != 0) {
break;
}
return 0;
default:
PyErr_Format(PyExc_ValueError,
"Invalid container format: %d", format);
break;
}
PyThread_free_lock(self->lock);
self->lock = NULL;
return -1;
}
static void
Compressor_dealloc(Compressor *self)
{
lzma_end(&self->lzs);
if (self->lock != NULL) {
PyThread_free_lock(self->lock);
}
PyTypeObject *tp = Py_TYPE(self);
tp->tp_free((PyObject *)self);
Py_DECREF(tp);
}
static PyMethodDef Compressor_methods[] = {
_LZMA_LZMACOMPRESSOR_COMPRESS_METHODDEF
_LZMA_LZMACOMPRESSOR_FLUSH_METHODDEF
{NULL}
};
static int
Compressor_traverse(Compressor *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
return 0;
}
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 support 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 PyType_Slot lzma_compressor_type_slots[] = {
{Py_tp_dealloc, Compressor_dealloc},
{Py_tp_methods, Compressor_methods},
{Py_tp_init, Compressor_init},
{Py_tp_new, PyType_GenericNew},
{Py_tp_doc, (char *)Compressor_doc},
{Py_tp_traverse, Compressor_traverse},
{0, 0}
};
static PyType_Spec lzma_compressor_type_spec = {
.name = "_lzma.LZMACompressor",
.basicsize = sizeof(Compressor),
// Calling PyType_GetModuleState() on a subclass is not safe.
// lzma_compressor_type_spec does not have Py_TPFLAGS_BASETYPE flag
// which prevents to create a subclass.
// So calling PyType_GetModuleState() in this file is always safe.
.flags = Py_TPFLAGS_DEFAULT,
.slots = lzma_compressor_type_slots,
};
/* LZMADecompressor class. */
/* Decompress data of length d->lzs.avail_in in d->lzs.next_in. The output
buffer is allocated dynamically and returned. At most max_length bytes are
returned, so some of the input may not be consumed. d->lzs.next_in and
d->lzs.avail_in are updated to reflect the consumed input. */
static PyObject*
decompress_buf(Decompressor *d, Py_ssize_t max_length)
{
Py_ssize_t data_size = 0;
PyObject *result;
lzma_stream *lzs = &d->lzs;
_lzma_state *state = PyType_GetModuleState(Py_TYPE(d));
assert(state != NULL);
if (max_length < 0 || max_length >= INITIAL_BUFFER_SIZE) {
result = PyBytes_FromStringAndSize(NULL, INITIAL_BUFFER_SIZE);
}
else {
result = PyBytes_FromStringAndSize(NULL, max_length);
}
if (result == NULL) {
return NULL;
}
lzs->next_out = (uint8_t *)PyBytes_AS_STRING(result);
lzs->avail_out = PyBytes_GET_SIZE(result);
for (;;) {
lzma_ret lzret;
Py_BEGIN_ALLOW_THREADS
lzret = lzma_code(lzs, LZMA_RUN);
data_size = (char *)lzs->next_out - PyBytes_AS_STRING(result);
if (lzret == LZMA_BUF_ERROR && lzs->avail_in == 0 && lzs->avail_out > 0) {
lzret = LZMA_OK; /* That wasn't a real error */
}
Py_END_ALLOW_THREADS
if (catch_lzma_error(state, 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;
break;
} else if (lzs->avail_out == 0) {
/* Need to check lzs->avail_out before lzs->avail_in.
Maybe lzs's internal state still have a few bytes
can be output, grow the output buffer and continue
if max_lengh < 0. */
if (data_size == max_length) {
break;
}
if (grow_buffer(&result, max_length) == -1) {
goto error;
}
lzs->next_out = (uint8_t *)PyBytes_AS_STRING(result) + data_size;
lzs->avail_out = PyBytes_GET_SIZE(result) - data_size;
} else if (lzs->avail_in == 0) {
break;
}
}
if (data_size != PyBytes_GET_SIZE(result)) {
if (_PyBytes_Resize(&result, data_size) == -1) {
goto error;
}
}
return result;
error:
Py_XDECREF(result);
return NULL;
}
static PyObject *
decompress(Decompressor *d, uint8_t *data, size_t len, Py_ssize_t max_length)
{
char input_buffer_in_use;
PyObject *result;
lzma_stream *lzs = &d->lzs;
/* Prepend unconsumed input if necessary */
if (lzs->next_in != NULL) {
size_t avail_now, avail_total;
/* Number of bytes we can append to input buffer */
avail_now = (d->input_buffer + d->input_buffer_size)
- (lzs->next_in + lzs->avail_in);
/* Number of bytes we can append if we move existing
contents to beginning of buffer (overwriting
consumed input) */
avail_total = d->input_buffer_size - lzs->avail_in;
if (avail_total < len) {
size_t offset = lzs->next_in - d->input_buffer;
uint8_t *tmp;
size_t new_size = d->input_buffer_size + len - avail_now;
/* Assign to temporary variable first, so we don't
lose address of allocated buffer if realloc fails */
tmp = PyMem_Realloc(d->input_buffer, new_size);
if (tmp == NULL) {
PyErr_SetNone(PyExc_MemoryError);
return NULL;
}
d->input_buffer = tmp;