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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(ZstdCompresssionWriter__doc__,
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"""A context manager used for writing compressed output to a writer.\n"
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);
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static void ZstdCompressionWriter_dealloc(ZstdCompressionWriter* self) {
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Py_XDECREF(self->compressor);
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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* ZstdCompressionWriter_enter(ZstdCompressionWriter* self) {
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size_t zresult;
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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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zresult = ZSTD_CCtx_setPledgedSrcSize(self->compressor->cctx, self->sourceSize);
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if (ZSTD_isError(zresult)) {
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PyErr_Format(ZstdError, "error setting source size: %s",
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ZSTD_getErrorName(zresult));
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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* ZstdCompressionWriter_exit(ZstdCompressionWriter* self, PyObject* args) {
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PyObject* exc_type;
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PyObject* exc_value;
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PyObject* exc_tb;
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size_t zresult;
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ZSTD_outBuffer output;
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PyObject* res;
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if (!PyArg_ParseTuple(args, "OOO:__exit__", &exc_type, &exc_value, &exc_tb)) {
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return NULL;
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}
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self->entered = 0;
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if (exc_type == Py_None && exc_value == Py_None && exc_tb == Py_None) {
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ZSTD_inBuffer inBuffer;
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inBuffer.src = NULL;
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inBuffer.size = 0;
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inBuffer.pos = 0;
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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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while (1) {
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zresult = ZSTD_compress_generic(self->compressor->cctx, &output, &inBuffer, ZSTD_e_end);
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if (ZSTD_isError(zresult)) {
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PyErr_Format(ZstdError, "error ending compression stream: %s",
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ZSTD_getErrorName(zresult));
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PyMem_Free(output.dst);
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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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}
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if (!zresult) {
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break;
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}
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output.pos = 0;
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}
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PyMem_Free(output.dst);
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}
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Py_RETURN_FALSE;
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}
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static PyObject* ZstdCompressionWriter_memory_size(ZstdCompressionWriter* self) {
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return PyLong_FromSize_t(ZSTD_sizeof_CCtx(self->compressor->cctx));
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}
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static PyObject* ZstdCompressionWriter_write(ZstdCompressionWriter* self, PyObject* args, PyObject* kwargs) {
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static char* kwlist[] = {
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"data",
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NULL
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};
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PyObject* result = NULL;
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Py_buffer source;
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size_t zresult;
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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_ParseTupleAndKeywords(args, kwargs, "y*:write",
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#else
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if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*:write",
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#endif
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kwlist, &source)) {
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return NULL;
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}
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if (!self->entered) {
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PyErr_SetString(ZstdError, "compress must be called from an active context manager");
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goto finally;
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}
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if (!PyBuffer_IsContiguous(&source, 'C') || source.ndim > 1) {
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PyErr_SetString(PyExc_ValueError,
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"data buffer should be contiguous and have at most one dimension");
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goto finally;
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}
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output.dst = PyMem_Malloc(self->outSize);
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if (!output.dst) {
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PyErr_NoMemory();
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goto finally;
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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.buf;
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input.size = source.len;
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input.pos = 0;
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while ((ssize_t)input.pos < source.len) {
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Py_BEGIN_ALLOW_THREADS
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zresult = ZSTD_compress_generic(self->compressor->cctx, &output, &input, ZSTD_e_continue);
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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 compress error: %s", ZSTD_getErrorName(zresult));
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goto finally;
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}
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/* Copy data from output buffer to writer. */
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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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self->bytesCompressed += output.pos;
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}
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output.pos = 0;
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}
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PyMem_Free(output.dst);
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result = PyLong_FromSsize_t(totalWrite);
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finally:
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PyBuffer_Release(&source);
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return result;
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}
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static PyObject* ZstdCompressionWriter_flush(ZstdCompressionWriter* self, PyObject* args) {
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size_t zresult;
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ZSTD_outBuffer output;
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ZSTD_inBuffer input;
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PyObject* res;
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Py_ssize_t totalWrite = 0;
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if (!self->entered) {
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PyErr_SetString(ZstdError, "flush must be called from an active context manager");
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return NULL;
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}
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input.src = NULL;
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input.size = 0;
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input.pos = 0;
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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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while (1) {
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Py_BEGIN_ALLOW_THREADS
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zresult = ZSTD_compress_generic(self->compressor->cctx, &output, &input, ZSTD_e_flush);
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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 compress error: %s", ZSTD_getErrorName(zresult));
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return NULL;
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}
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/* Copy data from output buffer to writer. */
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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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self->bytesCompressed += output.pos;
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}
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output.pos = 0;
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if (!zresult) {
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break;
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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 PyObject* ZstdCompressionWriter_tell(ZstdCompressionWriter* self) {
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return PyLong_FromUnsignedLongLong(self->bytesCompressed);
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}
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static PyMethodDef ZstdCompressionWriter_methods[] = {
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{ "__enter__", (PyCFunction)ZstdCompressionWriter_enter, METH_NOARGS,
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PyDoc_STR("Enter a compression context.") },
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{ "__exit__", (PyCFunction)ZstdCompressionWriter_exit, METH_VARARGS,
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PyDoc_STR("Exit a compression context.") },
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{ "memory_size", (PyCFunction)ZstdCompressionWriter_memory_size, METH_NOARGS,
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PyDoc_STR("Obtain the memory size of the underlying compressor") },
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{ "write", (PyCFunction)ZstdCompressionWriter_write, METH_VARARGS | METH_KEYWORDS,
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PyDoc_STR("Compress data") },
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{ "flush", (PyCFunction)ZstdCompressionWriter_flush, METH_NOARGS,
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PyDoc_STR("Flush data and finish a zstd frame") },
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{ "tell", (PyCFunction)ZstdCompressionWriter_tell, METH_NOARGS,
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PyDoc_STR("Returns current number of bytes compressed") },
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{ NULL, NULL }
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};
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PyTypeObject ZstdCompressionWriterType = {
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PyVarObject_HEAD_INIT(NULL, 0)
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"zstd.ZstdCompressionWriter", /* tp_name */
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sizeof(ZstdCompressionWriter), /* tp_basicsize */
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0, /* tp_itemsize */
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(destructor)ZstdCompressionWriter_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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ZstdCompresssionWriter__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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ZstdCompressionWriter_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 compressionwriter_module_init(PyObject* mod) {
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Py_TYPE(&ZstdCompressionWriterType) = &PyType_Type;
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if (PyType_Ready(&ZstdCompressionWriterType) < 0) {
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return;
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}
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}
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