Mercurial > hg
view contrib/python-zstandard/c-ext/compressobj.c @ 45646:1efbc787334c
rust-parsers: use in-place mutation instead of allocating a new `Vec`
This is not done for the `dirstate-tree` feature, since it lacks `iter_mut`.
Differential Revision: https://phab.mercurial-scm.org/D9136
author | Raphaël Gomès <rgomes@octobus.net> |
---|---|
date | Thu, 01 Oct 2020 09:48:41 +0200 |
parents | 675775c33ab6 |
children | e92ca942ddca |
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/** * 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(ZstdCompressionObj__doc__, "Perform compression using a standard library compatible API.\n" ); static void ZstdCompressionObj_dealloc(ZstdCompressionObj* self) { PyMem_Free(self->output.dst); self->output.dst = NULL; Py_XDECREF(self->compressor); PyObject_Del(self); } static PyObject* ZstdCompressionObj_compress(ZstdCompressionObj* self, PyObject* args, PyObject* kwargs) { static char* kwlist[] = { "data", NULL }; Py_buffer source; ZSTD_inBuffer input; size_t zresult; PyObject* result = NULL; Py_ssize_t resultSize = 0; if (self->finished) { PyErr_SetString(ZstdError, "cannot call compress() after compressor finished"); return NULL; } #if PY_MAJOR_VERSION >= 3 if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*:compress", #else if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*:compress", #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; } input.src = source.buf; input.size = source.len; input.pos = 0; while (input.pos < (size_t)source.len) { Py_BEGIN_ALLOW_THREADS zresult = ZSTD_compressStream2(self->compressor->cctx, &self->output, &input, ZSTD_e_continue); Py_END_ALLOW_THREADS if (ZSTD_isError(zresult)) { PyErr_Format(ZstdError, "zstd compress error: %s", ZSTD_getErrorName(zresult)); Py_CLEAR(result); goto finally; } if (self->output.pos) { if (result) { resultSize = PyBytes_GET_SIZE(result); if (safe_pybytes_resize(&result, resultSize + self->output.pos)) { Py_CLEAR(result); goto finally; } memcpy(PyBytes_AS_STRING(result) + resultSize, self->output.dst, self->output.pos); } else { result = PyBytes_FromStringAndSize(self->output.dst, self->output.pos); if (!result) { goto finally; } } self->output.pos = 0; } } if (NULL == result) { result = PyBytes_FromString(""); } finally: PyBuffer_Release(&source); return result; } static PyObject* ZstdCompressionObj_flush(ZstdCompressionObj* self, PyObject* args, PyObject* kwargs) { static char* kwlist[] = { "flush_mode", NULL }; int flushMode = compressorobj_flush_finish; size_t zresult; PyObject* result = NULL; Py_ssize_t resultSize = 0; ZSTD_inBuffer input; ZSTD_EndDirective zFlushMode; if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i:flush", kwlist, &flushMode)) { return NULL; } if (flushMode != compressorobj_flush_finish && flushMode != compressorobj_flush_block) { PyErr_SetString(PyExc_ValueError, "flush mode not recognized"); return NULL; } if (self->finished) { PyErr_SetString(ZstdError, "compressor object already finished"); return NULL; } switch (flushMode) { case compressorobj_flush_block: zFlushMode = ZSTD_e_flush; break; case compressorobj_flush_finish: zFlushMode = ZSTD_e_end; self->finished = 1; break; default: PyErr_SetString(ZstdError, "unhandled flush mode"); return NULL; } assert(self->output.pos == 0); input.src = NULL; input.size = 0; input.pos = 0; while (1) { Py_BEGIN_ALLOW_THREADS zresult = ZSTD_compressStream2(self->compressor->cctx, &self->output, &input, zFlushMode); Py_END_ALLOW_THREADS if (ZSTD_isError(zresult)) { PyErr_Format(ZstdError, "error ending compression stream: %s", ZSTD_getErrorName(zresult)); return NULL; } if (self->output.pos) { if (result) { resultSize = PyBytes_GET_SIZE(result); if (safe_pybytes_resize(&result, resultSize + self->output.pos)) { Py_XDECREF(result); return NULL; } memcpy(PyBytes_AS_STRING(result) + resultSize, self->output.dst, self->output.pos); } else { result = PyBytes_FromStringAndSize(self->output.dst, self->output.pos); if (!result) { return NULL; } } self->output.pos = 0; } if (!zresult) { break; } } if (result) { return result; } else { return PyBytes_FromString(""); } } static PyMethodDef ZstdCompressionObj_methods[] = { { "compress", (PyCFunction)ZstdCompressionObj_compress, METH_VARARGS | METH_KEYWORDS, PyDoc_STR("compress data") }, { "flush", (PyCFunction)ZstdCompressionObj_flush, METH_VARARGS | METH_KEYWORDS, PyDoc_STR("finish compression operation") }, { NULL, NULL } }; PyTypeObject ZstdCompressionObjType = { PyVarObject_HEAD_INIT(NULL, 0) "zstd.ZstdCompressionObj", /* tp_name */ sizeof(ZstdCompressionObj), /* tp_basicsize */ 0, /* tp_itemsize */ (destructor)ZstdCompressionObj_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 */ ZstdCompressionObj__doc__, /* tp_doc */ 0, /* tp_traverse */ 0, /* tp_clear */ 0, /* tp_richcompare */ 0, /* tp_weaklistoffset */ 0, /* tp_iter */ 0, /* tp_iternext */ ZstdCompressionObj_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 compressobj_module_init(PyObject* module) { Py_TYPE(&ZstdCompressionObjType) = &PyType_Type; if (PyType_Ready(&ZstdCompressionObjType) < 0) { return; } }