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/**
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* Copyright (c) 2018-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(ZstdCompressionChunkerIterator__doc__,
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"Iterator of output chunks from ZstdCompressionChunker.\n"
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);
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static void ZstdCompressionChunkerIterator_dealloc(ZstdCompressionChunkerIterator* self) {
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Py_XDECREF(self->chunker);
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PyObject_Del(self);
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}
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static PyObject* ZstdCompressionChunkerIterator_iter(PyObject* self) {
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Py_INCREF(self);
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return self;
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}
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static PyObject* ZstdCompressionChunkerIterator_iternext(ZstdCompressionChunkerIterator* self) {
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size_t zresult;
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PyObject* chunk;
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ZstdCompressionChunker* chunker = self->chunker;
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ZSTD_EndDirective zFlushMode;
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if (self->mode != compressionchunker_mode_normal && chunker->input.pos != chunker->input.size) {
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PyErr_SetString(ZstdError, "input should have been fully consumed before calling flush() or finish()");
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return NULL;
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}
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if (chunker->finished) {
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return NULL;
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}
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/* If we have data left in the input, consume it. */
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while (chunker->input.pos < chunker->input.size) {
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Py_BEGIN_ALLOW_THREADS
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zresult = ZSTD_compress_generic(chunker->compressor->cctx, &chunker->output,
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&chunker->input, ZSTD_e_continue);
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Py_END_ALLOW_THREADS
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/* Input is fully consumed. */
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if (chunker->input.pos == chunker->input.size) {
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chunker->input.src = NULL;
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chunker->input.pos = 0;
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chunker->input.size = 0;
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PyBuffer_Release(&chunker->inBuffer);
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}
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if (ZSTD_isError(zresult)) {
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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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/* If it produced a full output chunk, emit it. */
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if (chunker->output.pos == chunker->output.size) {
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chunk = PyBytes_FromStringAndSize(chunker->output.dst, chunker->output.pos);
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if (!chunk) {
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return NULL;
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}
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chunker->output.pos = 0;
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return chunk;
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}
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/* Else continue to compress available input data. */
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}
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/* We also need this here for the special case of an empty input buffer. */
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if (chunker->input.pos == chunker->input.size) {
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chunker->input.src = NULL;
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chunker->input.pos = 0;
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chunker->input.size = 0;
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PyBuffer_Release(&chunker->inBuffer);
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}
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/* No more input data. A partial chunk may be in chunker->output.
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* If we're in normal compression mode, we're done. Otherwise if we're in
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* flush or finish mode, we need to emit what data remains.
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*/
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if (self->mode == compressionchunker_mode_normal) {
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/* We don't need to set StopIteration. */
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return NULL;
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}
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if (self->mode == compressionchunker_mode_flush) {
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zFlushMode = ZSTD_e_flush;
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}
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else if (self->mode == compressionchunker_mode_finish) {
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zFlushMode = ZSTD_e_end;
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}
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else {
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PyErr_SetString(ZstdError, "unhandled compression mode; this should never happen");
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return NULL;
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}
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Py_BEGIN_ALLOW_THREADS
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zresult = ZSTD_compress_generic(chunker->compressor->cctx, &chunker->output,
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&chunker->input, zFlushMode);
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Py_END_ALLOW_THREADS
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if (ZSTD_isError(zresult)) {
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PyErr_Format(ZstdError, "zstd compress error: %s",
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ZSTD_getErrorName(zresult));
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return NULL;
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}
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if (!zresult && chunker->output.pos == 0) {
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return NULL;
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}
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chunk = PyBytes_FromStringAndSize(chunker->output.dst, chunker->output.pos);
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if (!chunk) {
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return NULL;
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}
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chunker->output.pos = 0;
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if (!zresult && self->mode == compressionchunker_mode_finish) {
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chunker->finished = 1;
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}
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return chunk;
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}
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PyTypeObject ZstdCompressionChunkerIteratorType = {
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PyVarObject_HEAD_INIT(NULL, 0)
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"zstd.ZstdCompressionChunkerIterator", /* tp_name */
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sizeof(ZstdCompressionChunkerIterator), /* tp_basicsize */
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0, /* tp_itemsize */
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(destructor)ZstdCompressionChunkerIterator_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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ZstdCompressionChunkerIterator__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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ZstdCompressionChunkerIterator_iter, /* tp_iter */
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(iternextfunc)ZstdCompressionChunkerIterator_iternext, /* tp_iternext */
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0, /* 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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PyDoc_STRVAR(ZstdCompressionChunker__doc__,
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"Compress chunks iteratively into exact chunk sizes.\n"
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);
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static void ZstdCompressionChunker_dealloc(ZstdCompressionChunker* self) {
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PyBuffer_Release(&self->inBuffer);
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self->input.src = NULL;
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PyMem_Free(self->output.dst);
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self->output.dst = NULL;
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Py_XDECREF(self->compressor);
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PyObject_Del(self);
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}
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static ZstdCompressionChunkerIterator* ZstdCompressionChunker_compress(ZstdCompressionChunker* 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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ZstdCompressionChunkerIterator* result;
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if (self->finished) {
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PyErr_SetString(ZstdError, "cannot call compress() after compression finished");
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return NULL;
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}
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if (self->inBuffer.obj) {
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PyErr_SetString(ZstdError,
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"cannot perform operation before consuming output from previous operation");
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return NULL;
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}
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#if PY_MAJOR_VERSION >= 3
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if (!PyArg_ParseTupleAndKeywords(args, kwargs, "y*:compress",
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#else
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if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*:compress",
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#endif
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kwlist, &self->inBuffer)) {
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return NULL;
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}
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if (!PyBuffer_IsContiguous(&self->inBuffer, 'C') || self->inBuffer.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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PyBuffer_Release(&self->inBuffer);
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return NULL;
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}
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result = (ZstdCompressionChunkerIterator*)PyObject_CallObject((PyObject*)&ZstdCompressionChunkerIteratorType, NULL);
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if (!result) {
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PyBuffer_Release(&self->inBuffer);
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return NULL;
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}
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self->input.src = self->inBuffer.buf;
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self->input.size = self->inBuffer.len;
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self->input.pos = 0;
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result->chunker = self;
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Py_INCREF(result->chunker);
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result->mode = compressionchunker_mode_normal;
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return result;
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}
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static ZstdCompressionChunkerIterator* ZstdCompressionChunker_finish(ZstdCompressionChunker* self) {
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ZstdCompressionChunkerIterator* result;
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if (self->finished) {
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PyErr_SetString(ZstdError, "cannot call finish() after compression finished");
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return NULL;
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}
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if (self->inBuffer.obj) {
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PyErr_SetString(ZstdError,
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"cannot call finish() before consuming output from previous operation");
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return NULL;
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}
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result = (ZstdCompressionChunkerIterator*)PyObject_CallObject((PyObject*)&ZstdCompressionChunkerIteratorType, NULL);
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if (!result) {
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return NULL;
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}
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result->chunker = self;
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Py_INCREF(result->chunker);
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result->mode = compressionchunker_mode_finish;
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return result;
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}
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static ZstdCompressionChunkerIterator* ZstdCompressionChunker_flush(ZstdCompressionChunker* self, PyObject* args, PyObject* kwargs) {
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ZstdCompressionChunkerIterator* result;
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if (self->finished) {
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PyErr_SetString(ZstdError, "cannot call flush() after compression finished");
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return NULL;
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}
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if (self->inBuffer.obj) {
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PyErr_SetString(ZstdError,
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"cannot call flush() before consuming output from previous operation");
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return NULL;
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}
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result = (ZstdCompressionChunkerIterator*)PyObject_CallObject((PyObject*)&ZstdCompressionChunkerIteratorType, NULL);
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if (!result) {
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return NULL;
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}
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result->chunker = self;
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Py_INCREF(result->chunker);
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result->mode = compressionchunker_mode_flush;
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return result;
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}
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static PyMethodDef ZstdCompressionChunker_methods[] = {
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{ "compress", (PyCFunction)ZstdCompressionChunker_compress, METH_VARARGS | METH_KEYWORDS,
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PyDoc_STR("compress data") },
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{ "finish", (PyCFunction)ZstdCompressionChunker_finish, METH_NOARGS,
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PyDoc_STR("finish compression operation") },
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{ "flush", (PyCFunction)ZstdCompressionChunker_flush, METH_VARARGS | METH_KEYWORDS,
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PyDoc_STR("finish compression operation") },
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{ NULL, NULL }
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};
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PyTypeObject ZstdCompressionChunkerType = {
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PyVarObject_HEAD_INIT(NULL, 0)
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"zstd.ZstdCompressionChunkerType", /* tp_name */
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sizeof(ZstdCompressionChunker), /* tp_basicsize */
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0, /* tp_itemsize */
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(destructor)ZstdCompressionChunker_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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ZstdCompressionChunker__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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ZstdCompressionChunker_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 compressionchunker_module_init(PyObject* module) {
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Py_TYPE(&ZstdCompressionChunkerIteratorType) = &PyType_Type;
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if (PyType_Ready(&ZstdCompressionChunkerIteratorType) < 0) {
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return;
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}
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Py_TYPE(&ZstdCompressionChunkerType) = &PyType_Type;
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if (PyType_Ready(&ZstdCompressionChunkerType) < 0) {
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return;
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}
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}
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