contrib/python-zstandard/c-ext/decompressobj.c

tests: handle Message-Id email header possible wrapping

The "Message-Id" header will get wrapped with a new line when exceeding
75 characters on Python 3 (see changeset 7d4f2e4899c5 introducing usage
of email.header.Header.encode and respective doc). This will occur in an
unpredictable manner depending on the hostname's length. To make the
test output consistent across Python versions and hostname
configuration, we add a filter to unwrap this header value.

/**
* Copyright (c) 2016-present, Gregory Szorc
* All rights reserved.
*
* This software may be modified and distributed under the terms
* of the BSD license. See the LICENSE file for details.
*/

#include "python-zstandard.h"

extern PyObject* ZstdError;

PyDoc_STRVAR(DecompressionObj__doc__,
"Perform decompression using a standard library compatible API.\n"
);

static void DecompressionObj_dealloc(ZstdDecompressionObj* self) {
	Py_XDECREF(self->decompressor);

	PyObject_Del(self);
}

static PyObject* DecompressionObj_decompress(ZstdDecompressionObj* self, PyObject* args, PyObject* kwargs) {
	static char* kwlist[] = {
		"data",
		NULL
	};

	Py_buffer source;
	size_t zresult;
	ZSTD_inBuffer input;
	ZSTD_outBuffer output;
	PyObject* result = NULL;
	Py_ssize_t resultSize = 0;

	output.dst = NULL;

	if (self->finished) {
		PyErr_SetString(ZstdError, "cannot use a decompressobj multiple times");
		return NULL;
	}

#if PY_MAJOR_VERSION >= 3
	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*:decompress",
#else
	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*:decompress",
#endif
		kwlist, &source)) {
		return NULL;
	}

	if (!PyBuffer_IsContiguous(&source, 'C') || source.ndim > 1) {
		PyErr_SetString(PyExc_ValueError,
			"data buffer should be contiguous and have at most one dimension");
		goto finally;
	}

	/* Special case of empty input. Output will always be empty. */
	if (source.len == 0) {
		result = PyBytes_FromString("");
		goto finally;
	}

	input.src = source.buf;
	input.size = source.len;
	input.pos = 0;

	output.dst = PyMem_Malloc(self->outSize);
	if (!output.dst) {
		PyErr_NoMemory();
		goto except;
	}
	output.size = self->outSize;
	output.pos = 0;

	while (1) {
		Py_BEGIN_ALLOW_THREADS
		zresult = ZSTD_decompressStream(self->decompressor->dctx, &output, &input);
		Py_END_ALLOW_THREADS

		if (ZSTD_isError(zresult)) {
			PyErr_Format(ZstdError, "zstd decompressor error: %s",
				ZSTD_getErrorName(zresult));
			goto except;
		}

		if (0 == zresult) {
			self->finished = 1;
		}

		if (output.pos) {
			if (result) {
				resultSize = PyBytes_GET_SIZE(result);
				if (-1 == safe_pybytes_resize(&result, resultSize + output.pos)) {
					Py_XDECREF(result);
					goto except;
				}

				memcpy(PyBytes_AS_STRING(result) + resultSize,
					output.dst, output.pos);
			}
			else {
				result = PyBytes_FromStringAndSize(output.dst, output.pos);
				if (!result) {
					goto except;
				}
			}
		}

		if (zresult == 0 || (input.pos == input.size && output.pos == 0)) {
			break;
		}

		output.pos = 0;
	}

	if (!result) {
		result = PyBytes_FromString("");
	}

	goto finally;

except:
	Py_CLEAR(result);

finally:
	PyMem_Free(output.dst);
	PyBuffer_Release(&source);

	return result;
}

static PyObject* DecompressionObj_flush(ZstdDecompressionObj* self, PyObject* args, PyObject* kwargs) {
	static char* kwlist[] = {
		"length",
		NULL
	};

	PyObject* length = NULL;

	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|O:flush", kwlist, &length)) {
	return NULL;
	}

	Py_RETURN_NONE;
}

static PyMethodDef DecompressionObj_methods[] = {
	{ "decompress", (PyCFunction)DecompressionObj_decompress,
	  METH_VARARGS | METH_KEYWORDS, PyDoc_STR("decompress data") },
	{ "flush", (PyCFunction)DecompressionObj_flush,
	  METH_VARARGS | METH_KEYWORDS, PyDoc_STR("no-op") },
	{ NULL, NULL }
};

PyTypeObject ZstdDecompressionObjType = {
	PyVarObject_HEAD_INIT(NULL, 0)
	"zstd.ZstdDecompressionObj",    /* tp_name */
	sizeof(ZstdDecompressionObj),   /* tp_basicsize */
	0,                              /* tp_itemsize */
	(destructor)DecompressionObj_dealloc, /* tp_dealloc */
	0,                              /* tp_print */
	0,                              /* tp_getattr */
	0,                              /* tp_setattr */
	0,                              /* tp_compare */
	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 | Py_TPFLAGS_BASETYPE, /* tp_flags */
	DecompressionObj__doc__,        /* tp_doc */
	0,                              /* tp_traverse */
	0,                              /* tp_clear */
	0,                              /* tp_richcompare */
	0,                              /* tp_weaklistoffset */
	0,                              /* tp_iter */
	0,                              /* tp_iternext */
	DecompressionObj_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 */
	0,                              /* tp_init */
	0,                              /* tp_alloc */
	PyType_GenericNew,              /* tp_new */
};

void decompressobj_module_init(PyObject* module) {
	Py_TYPE(&ZstdDecompressionObjType) = &PyType_Type;
	if (PyType_Ready(&ZstdDecompressionObjType) < 0) {
		return;
	}
}