contrib/python-zstandard/c-ext/decompressionwriter.c
author Gregory Szorc <gregory.szorc@gmail.com>
Sat, 01 Apr 2017 15:24:03 -0700
changeset 31796 e0dc40530c5a
parent 30895 c32454d69b85
child 37495 b1fb341d8a61
permissions -rw-r--r--
zstd: vendor python-zstandard 0.8.0 Commit 81e1f5bbf1fc54808649562d3ed829730765c540 from https://github.com/indygreg/python-zstandard is imported without modifications (other than removing unwanted files). Updates relevant to Mercurial include: * Support for multi-threaded compression (we can use this for bundle and wire protocol compression). * APIs for batch compression and decompression operations using multiple threads and optimal memory allocation mechanism. (Can be useful for revlog perf improvements.) * A ``BufferWithSegments`` type that models a single memory buffer containing N discrete items of known lengths. This type can be used for very efficient 0-copy data operations. # no-check-commit
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/**
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* Copyright (c) 2016-present, Gregory Szorc
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* All rights reserved.
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*
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* This software may be modified and distributed under the terms
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* of the BSD license. See the LICENSE file for details.
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*/
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#include "python-zstandard.h"
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extern PyObject* ZstdError;
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PyDoc_STRVAR(ZstdDecompressionWriter__doc,
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"""A context manager used for writing decompressed output.\n"
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);
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static void ZstdDecompressionWriter_dealloc(ZstdDecompressionWriter* self) {
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	Py_XDECREF(self->decompressor);
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	Py_XDECREF(self->writer);
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	PyObject_Del(self);
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}
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static PyObject* ZstdDecompressionWriter_enter(ZstdDecompressionWriter* self) {
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	if (self->entered) {
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		PyErr_SetString(ZstdError, "cannot __enter__ multiple times");
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		return NULL;
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	}
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	if (0 != init_dstream(self->decompressor)) {
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		return NULL;
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	}
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	self->entered = 1;
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	Py_INCREF(self);
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	return (PyObject*)self;
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}
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static PyObject* ZstdDecompressionWriter_exit(ZstdDecompressionWriter* self, PyObject* args) {
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	self->entered = 0;
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	Py_RETURN_FALSE;
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}
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static PyObject* ZstdDecompressionWriter_memory_size(ZstdDecompressionWriter* self) {
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	if (!self->decompressor->dstream) {
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		PyErr_SetString(ZstdError, "cannot determine size of inactive decompressor; "
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			"call when context manager is active");
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		return NULL;
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	}
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	return PyLong_FromSize_t(ZSTD_sizeof_DStream(self->decompressor->dstream));
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}
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static PyObject* ZstdDecompressionWriter_write(ZstdDecompressionWriter* self, PyObject* args) {
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	const char* source;
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	Py_ssize_t sourceSize;
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	size_t zresult = 0;
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	ZSTD_inBuffer input;
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	ZSTD_outBuffer output;
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	PyObject* res;
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	Py_ssize_t totalWrite = 0;
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#if PY_MAJOR_VERSION >= 3
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	if (!PyArg_ParseTuple(args, "y#:write", &source, &sourceSize)) {
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#else
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	if (!PyArg_ParseTuple(args, "s#:write", &source, &sourceSize)) {
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#endif
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		return NULL;
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	}
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	if (!self->entered) {
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		PyErr_SetString(ZstdError, "write must be called from an active context manager");
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		return NULL;
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	}
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	assert(self->decompressor->dstream);
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	output.dst = PyMem_Malloc(self->outSize);
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	if (!output.dst) {
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		return PyErr_NoMemory();
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	}
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	output.size = self->outSize;
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	output.pos = 0;
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	input.src = source;
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	input.size = sourceSize;
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	input.pos = 0;
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	while ((ssize_t)input.pos < sourceSize) {
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		Py_BEGIN_ALLOW_THREADS
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		zresult = ZSTD_decompressStream(self->decompressor->dstream, &output, &input);
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		Py_END_ALLOW_THREADS
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		if (ZSTD_isError(zresult)) {
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			PyMem_Free(output.dst);
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			PyErr_Format(ZstdError, "zstd decompress error: %s",
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				ZSTD_getErrorName(zresult));
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			return NULL;
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		}
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		if (output.pos) {
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#if PY_MAJOR_VERSION >= 3
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			res = PyObject_CallMethod(self->writer, "write", "y#",
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#else
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			res = PyObject_CallMethod(self->writer, "write", "s#",
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#endif
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				output.dst, output.pos);
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			Py_XDECREF(res);
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			totalWrite += output.pos;
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			output.pos = 0;
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		}
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	}
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	PyMem_Free(output.dst);
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	return PyLong_FromSsize_t(totalWrite);
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}
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static PyMethodDef ZstdDecompressionWriter_methods[] = {
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	{ "__enter__", (PyCFunction)ZstdDecompressionWriter_enter, METH_NOARGS,
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	PyDoc_STR("Enter a decompression context.") },
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	{ "__exit__", (PyCFunction)ZstdDecompressionWriter_exit, METH_VARARGS,
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	PyDoc_STR("Exit a decompression context.") },
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	{ "memory_size", (PyCFunction)ZstdDecompressionWriter_memory_size, METH_NOARGS,
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	PyDoc_STR("Obtain the memory size in bytes of the underlying decompressor.") },
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	{ "write", (PyCFunction)ZstdDecompressionWriter_write, METH_VARARGS,
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	PyDoc_STR("Compress data") },
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	{ NULL, NULL }
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};
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PyTypeObject ZstdDecompressionWriterType = {
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	PyVarObject_HEAD_INIT(NULL, 0)
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	"zstd.ZstdDecompressionWriter", /* tp_name */
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	sizeof(ZstdDecompressionWriter),/* tp_basicsize */
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	0,                              /* tp_itemsize */
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	(destructor)ZstdDecompressionWriter_dealloc, /* tp_dealloc */
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	0,                              /* tp_print */
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	0,                              /* tp_getattr */
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	0,                              /* tp_setattr */
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	0,                              /* tp_compare */
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	0,                              /* tp_repr */
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	0,                              /* tp_as_number */
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	0,                              /* tp_as_sequence */
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	0,                              /* tp_as_mapping */
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	0,                              /* tp_hash */
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	0,                              /* tp_call */
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	0,                              /* tp_str */
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	0,                              /* tp_getattro */
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	0,                              /* tp_setattro */
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	0,                              /* tp_as_buffer */
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	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
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	ZstdDecompressionWriter__doc,   /* tp_doc */
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	0,                              /* tp_traverse */
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	0,                              /* tp_clear */
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	0,                              /* tp_richcompare */
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	0,                              /* tp_weaklistoffset */
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	0,                              /* tp_iter */
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	0,                              /* tp_iternext */
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	ZstdDecompressionWriter_methods,/* tp_methods */
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	0,                              /* tp_members */
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	0,                              /* tp_getset */
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	0,                              /* tp_base */
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	0,                              /* tp_dict */
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	0,                              /* tp_descr_get */
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	0,                              /* tp_descr_set */
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	0,                              /* tp_dictoffset */
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	0,                              /* tp_init */
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	0,                              /* tp_alloc */
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	PyType_GenericNew,              /* tp_new */
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};
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void decompressionwriter_module_init(PyObject* mod) {
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	Py_TYPE(&ZstdDecompressionWriterType) = &PyType_Type;
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	if (PyType_Ready(&ZstdDecompressionWriterType) < 0) {
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		return;
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	}
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}