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/**
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* Copyright (c) 2017-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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static void set_unsupported_operation(void) {
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PyObject* iomod;
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PyObject* exc;
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iomod = PyImport_ImportModule("io");
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if (NULL == iomod) {
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return;
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}
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exc = PyObject_GetAttrString(iomod, "UnsupportedOperation");
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if (NULL == exc) {
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Py_DECREF(iomod);
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return;
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}
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PyErr_SetNone(exc);
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Py_DECREF(exc);
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Py_DECREF(iomod);
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}
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static void reader_dealloc(ZstdDecompressionReader* self) {
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Py_XDECREF(self->decompressor);
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Py_XDECREF(self->reader);
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if (self->buffer.buf) {
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PyBuffer_Release(&self->buffer);
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}
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PyObject_Del(self);
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}
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static ZstdDecompressionReader* reader_enter(ZstdDecompressionReader* self) {
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if (self->entered) {
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PyErr_SetString(PyExc_ValueError, "cannot __enter__ multiple times");
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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 self;
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}
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static PyObject* reader_exit(ZstdDecompressionReader* 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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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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self->closed = 1;
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/* Release resources. */
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Py_CLEAR(self->reader);
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if (self->buffer.buf) {
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PyBuffer_Release(&self->buffer);
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memset(&self->buffer, 0, sizeof(self->buffer));
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}
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Py_CLEAR(self->decompressor);
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Py_RETURN_FALSE;
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}
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static PyObject* reader_readable(PyObject* self) {
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Py_RETURN_TRUE;
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}
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static PyObject* reader_writable(PyObject* self) {
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Py_RETURN_FALSE;
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}
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static PyObject* reader_seekable(PyObject* self) {
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Py_RETURN_TRUE;
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}
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static PyObject* reader_close(ZstdDecompressionReader* self) {
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self->closed = 1;
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Py_RETURN_NONE;
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}
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static PyObject* reader_flush(PyObject* self) {
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Py_RETURN_NONE;
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}
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static PyObject* reader_isatty(PyObject* self) {
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Py_RETURN_FALSE;
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}
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/**
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* Read available input.
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*
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* Returns 0 if no data was added to input.
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* Returns 1 if new input data is available.
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* Returns -1 on error and sets a Python exception as a side-effect.
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*/
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int read_decompressor_input(ZstdDecompressionReader* self) {
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if (self->finishedInput) {
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return 0;
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}
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if (self->input.pos != self->input.size) {
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return 0;
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}
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if (self->reader) {
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Py_buffer buffer;
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assert(self->readResult == NULL);
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self->readResult = PyObject_CallMethod(self->reader, "read",
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"k", self->readSize);
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if (NULL == self->readResult) {
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return -1;
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}
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memset(&buffer, 0, sizeof(buffer));
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if (0 != PyObject_GetBuffer(self->readResult, &buffer, PyBUF_CONTIG_RO)) {
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return -1;
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}
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/* EOF */
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if (0 == buffer.len) {
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self->finishedInput = 1;
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Py_CLEAR(self->readResult);
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}
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else {
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self->input.src = buffer.buf;
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self->input.size = buffer.len;
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self->input.pos = 0;
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}
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PyBuffer_Release(&buffer);
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}
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else {
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assert(self->buffer.buf);
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/*
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* We should only get here once since expectation is we always
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* exhaust input buffer before reading again.
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*/
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assert(self->input.src == NULL);
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self->input.src = self->buffer.buf;
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self->input.size = self->buffer.len;
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self->input.pos = 0;
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}
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return 1;
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}
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/**
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* Decompresses available input into an output buffer.
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*
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* Returns 0 if we need more input.
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* Returns 1 if output buffer should be emitted.
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* Returns -1 on error and sets a Python exception.
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*/
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int decompress_input(ZstdDecompressionReader* self, ZSTD_outBuffer* output) {
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size_t zresult;
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if (self->input.pos >= self->input.size) {
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return 0;
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}
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Py_BEGIN_ALLOW_THREADS
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zresult = ZSTD_decompressStream(self->decompressor->dctx, output, &self->input);
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Py_END_ALLOW_THREADS
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/* Input exhausted. Clear our state tracking. */
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if (self->input.pos == self->input.size) {
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memset(&self->input, 0, sizeof(self->input));
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Py_CLEAR(self->readResult);
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if (self->buffer.buf) {
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self->finishedInput = 1;
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}
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}
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if (ZSTD_isError(zresult)) {
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PyErr_Format(ZstdError, "zstd decompress error: %s", ZSTD_getErrorName(zresult));
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return -1;
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}
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/* We fulfilled the full read request. Signal to emit. */
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if (output->pos && output->pos == output->size) {
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return 1;
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}
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/* We're at the end of a frame and we aren't allowed to return data
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spanning frames. */
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else if (output->pos && zresult == 0 && !self->readAcrossFrames) {
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return 1;
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}
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/* There is more room in the output. Signal to collect more data. */
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return 0;
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}
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static PyObject* reader_read(ZstdDecompressionReader* self, PyObject* args, PyObject* kwargs) {
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static char* kwlist[] = {
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"size",
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NULL
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};
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Py_ssize_t size = -1;
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PyObject* result = NULL;
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char* resultBuffer;
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Py_ssize_t resultSize;
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ZSTD_outBuffer output;
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int decompressResult, readResult;
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if (self->closed) {
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PyErr_SetString(PyExc_ValueError, "stream is closed");
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return NULL;
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}
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if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|n", kwlist, &size)) {
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return NULL;
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}
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if (size < -1) {
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PyErr_SetString(PyExc_ValueError, "cannot read negative amounts less than -1");
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return NULL;
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}
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if (size == -1) {
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return PyObject_CallMethod((PyObject*)self, "readall", NULL);
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}
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if (self->finishedOutput || size == 0) {
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return PyBytes_FromStringAndSize("", 0);
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}
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result = PyBytes_FromStringAndSize(NULL, size);
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if (NULL == result) {
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return NULL;
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}
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PyBytes_AsStringAndSize(result, &resultBuffer, &resultSize);
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output.dst = resultBuffer;
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output.size = resultSize;
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output.pos = 0;
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readinput:
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decompressResult = decompress_input(self, &output);
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if (-1 == decompressResult) {
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Py_XDECREF(result);
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return NULL;
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}
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else if (0 == decompressResult) { }
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else if (1 == decompressResult) {
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self->bytesDecompressed += output.pos;
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if (output.pos != output.size) {
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if (safe_pybytes_resize(&result, output.pos)) {
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Py_XDECREF(result);
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return NULL;
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}
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}
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return result;
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}
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else {
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assert(0);
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}
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readResult = read_decompressor_input(self);
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if (-1 == readResult) {
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Py_XDECREF(result);
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return NULL;
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}
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else if (0 == readResult) {}
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else if (1 == readResult) {}
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else {
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assert(0);
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}
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if (self->input.size) {
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goto readinput;
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}
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/* EOF */
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self->bytesDecompressed += output.pos;
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if (safe_pybytes_resize(&result, output.pos)) {
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Py_XDECREF(result);
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return NULL;
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}
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return result;
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}
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static PyObject* reader_read1(ZstdDecompressionReader* self, PyObject* args, PyObject* kwargs) {
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static char* kwlist[] = {
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"size",
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NULL
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};
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Py_ssize_t size = -1;
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PyObject* result = NULL;
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char* resultBuffer;
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Py_ssize_t resultSize;
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ZSTD_outBuffer output;
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if (self->closed) {
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PyErr_SetString(PyExc_ValueError, "stream is closed");
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return NULL;
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}
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if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|n", kwlist, &size)) {
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return NULL;
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}
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if (size < -1) {
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PyErr_SetString(PyExc_ValueError, "cannot read negative amounts less than -1");
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return NULL;
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}
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if (self->finishedOutput || size == 0) {
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return PyBytes_FromStringAndSize("", 0);
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}
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if (size == -1) {
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size = ZSTD_DStreamOutSize();
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}
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result = PyBytes_FromStringAndSize(NULL, size);
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if (NULL == result) {
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return NULL;
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}
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PyBytes_AsStringAndSize(result, &resultBuffer, &resultSize);
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output.dst = resultBuffer;
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output.size = resultSize;
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output.pos = 0;
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/* read1() is supposed to use at most 1 read() from the underlying stream.
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* However, we can't satisfy this requirement with decompression due to the
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* nature of how decompression works. Our strategy is to read + decompress
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* until we get any output, at which point we return. This satisfies the
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* intent of the read1() API to limit read operations.
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*/
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while (!self->finishedInput) {
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int readResult, decompressResult;
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readResult = read_decompressor_input(self);
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if (-1 == readResult) {
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Py_XDECREF(result);
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return NULL;
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}
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else if (0 == readResult || 1 == readResult) { }
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else {
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assert(0);
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}
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decompressResult = decompress_input(self, &output);
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if (-1 == decompressResult) {
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Py_XDECREF(result);
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return NULL;
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}
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else if (0 == decompressResult || 1 == decompressResult) { }
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else {
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assert(0);
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}
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if (output.pos) {
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break;
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}
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}
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self->bytesDecompressed += output.pos;
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if (safe_pybytes_resize(&result, output.pos)) {
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Py_XDECREF(result);
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return NULL;
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}
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return result;
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}
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static PyObject* reader_readinto(ZstdDecompressionReader* self, PyObject* args) {
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Py_buffer dest;
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ZSTD_outBuffer output;
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int decompressResult, readResult;
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PyObject* result = NULL;
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if (self->closed) {
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PyErr_SetString(PyExc_ValueError, "stream is closed");
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return NULL;
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}
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|
|
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if (self->finishedOutput) {
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return PyLong_FromLong(0);
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}
|
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|
|
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if (!PyArg_ParseTuple(args, "w*:readinto", &dest)) {
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return NULL;
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}
|
|
|
|
|
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if (!PyBuffer_IsContiguous(&dest, 'C') || dest.ndim > 1) {
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PyErr_SetString(PyExc_ValueError,
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"destination 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 = dest.buf;
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output.size = dest.len;
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output.pos = 0;
|
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|
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readinput:
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decompressResult = decompress_input(self, &output);
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|
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if (-1 == decompressResult) {
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goto finally;
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}
|
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else if (0 == decompressResult) { }
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else if (1 == decompressResult) {
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|
self->bytesDecompressed += output.pos;
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|
result = PyLong_FromSize_t(output.pos);
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goto finally;
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}
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else {
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assert(0);
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}
|
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|
|
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readResult = read_decompressor_input(self);
|
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|
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if (-1 == readResult) {
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goto finally;
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}
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else if (0 == readResult) {}
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else if (1 == readResult) {}
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else {
|
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assert(0);
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}
|
|
|
|
|
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if (self->input.size) {
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goto readinput;
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}
|
|
|
|
|
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/* EOF */
|
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|
self->bytesDecompressed += output.pos;
|
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|
result = PyLong_FromSize_t(output.pos);
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finally:
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|
PyBuffer_Release(&dest);
|
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|
|
|
|
return result;
|
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|
}
|
|
|
|
|
|
static PyObject* reader_readinto1(ZstdDecompressionReader* self, PyObject* args) {
|
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|
Py_buffer dest;
|
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|
ZSTD_outBuffer output;
|
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|
PyObject* result = NULL;
|
|
|
|
|
|
if (self->closed) {
|
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|
PyErr_SetString(PyExc_ValueError, "stream is closed");
|
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|
return NULL;
|
|
|
}
|
|
|
|
|
|
if (self->finishedOutput) {
|
|
|
return PyLong_FromLong(0);
|
|
|
}
|
|
|
|
|
|
if (!PyArg_ParseTuple(args, "w*:readinto1", &dest)) {
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
if (!PyBuffer_IsContiguous(&dest, 'C') || dest.ndim > 1) {
|
|
|
PyErr_SetString(PyExc_ValueError,
|
|
|
"destination buffer should be contiguous and have at most one dimension");
|
|
|
goto finally;
|
|
|
}
|
|
|
|
|
|
output.dst = dest.buf;
|
|
|
output.size = dest.len;
|
|
|
output.pos = 0;
|
|
|
|
|
|
while (!self->finishedInput && !self->finishedOutput) {
|
|
|
int decompressResult, readResult;
|
|
|
|
|
|
readResult = read_decompressor_input(self);
|
|
|
|
|
|
if (-1 == readResult) {
|
|
|
goto finally;
|
|
|
}
|
|
|
else if (0 == readResult || 1 == readResult) {}
|
|
|
else {
|
|
|
assert(0);
|
|
|
}
|
|
|
|
|
|
decompressResult = decompress_input(self, &output);
|
|
|
|
|
|
if (-1 == decompressResult) {
|
|
|
goto finally;
|
|
|
}
|
|
|
else if (0 == decompressResult || 1 == decompressResult) {}
|
|
|
else {
|
|
|
assert(0);
|
|
|
}
|
|
|
|
|
|
if (output.pos) {
|
|
|
break;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
self->bytesDecompressed += output.pos;
|
|
|
result = PyLong_FromSize_t(output.pos);
|
|
|
|
|
|
finally:
|
|
|
PyBuffer_Release(&dest);
|
|
|
|
|
|
return result;
|
|
|
}
|
|
|
|
|
|
static PyObject* reader_readall(PyObject* self) {
|
|
|
PyObject* chunks = NULL;
|
|
|
PyObject* empty = NULL;
|
|
|
PyObject* result = NULL;
|
|
|
|
|
|
/* Our strategy is to collect chunks into a list then join all the
|
|
|
* chunks at the end. We could potentially use e.g. an io.BytesIO. But
|
|
|
* this feels simple enough to implement and avoids potentially expensive
|
|
|
* reallocations of large buffers.
|
|
|
*/
|
|
|
chunks = PyList_New(0);
|
|
|
if (NULL == chunks) {
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
while (1) {
|
|
|
PyObject* chunk = PyObject_CallMethod(self, "read", "i", 1048576);
|
|
|
if (NULL == chunk) {
|
|
|
Py_DECREF(chunks);
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
if (!PyBytes_Size(chunk)) {
|
|
|
Py_DECREF(chunk);
|
|
|
break;
|
|
|
}
|
|
|
|
|
|
if (PyList_Append(chunks, chunk)) {
|
|
|
Py_DECREF(chunk);
|
|
|
Py_DECREF(chunks);
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
Py_DECREF(chunk);
|
|
|
}
|
|
|
|
|
|
empty = PyBytes_FromStringAndSize("", 0);
|
|
|
if (NULL == empty) {
|
|
|
Py_DECREF(chunks);
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
result = PyObject_CallMethod(empty, "join", "O", chunks);
|
|
|
|
|
|
Py_DECREF(empty);
|
|
|
Py_DECREF(chunks);
|
|
|
|
|
|
return result;
|
|
|
}
|
|
|
|
|
|
static PyObject* reader_readline(PyObject* self) {
|
|
|
set_unsupported_operation();
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
static PyObject* reader_readlines(PyObject* self) {
|
|
|
set_unsupported_operation();
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
static PyObject* reader_seek(ZstdDecompressionReader* self, PyObject* args) {
|
|
|
Py_ssize_t pos;
|
|
|
int whence = 0;
|
|
|
unsigned long long readAmount = 0;
|
|
|
size_t defaultOutSize = ZSTD_DStreamOutSize();
|
|
|
|
|
|
if (self->closed) {
|
|
|
PyErr_SetString(PyExc_ValueError, "stream is closed");
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
if (!PyArg_ParseTuple(args, "n|i:seek", &pos, &whence)) {
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
if (whence == SEEK_SET) {
|
|
|
if (pos < 0) {
|
|
|
PyErr_SetString(PyExc_ValueError,
|
|
|
"cannot seek to negative position with SEEK_SET");
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
if ((unsigned long long)pos < self->bytesDecompressed) {
|
|
|
PyErr_SetString(PyExc_ValueError,
|
|
|
"cannot seek zstd decompression stream backwards");
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
readAmount = pos - self->bytesDecompressed;
|
|
|
}
|
|
|
else if (whence == SEEK_CUR) {
|
|
|
if (pos < 0) {
|
|
|
PyErr_SetString(PyExc_ValueError,
|
|
|
"cannot seek zstd decompression stream backwards");
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
readAmount = pos;
|
|
|
}
|
|
|
else if (whence == SEEK_END) {
|
|
|
/* We /could/ support this with pos==0. But let's not do that until someone
|
|
|
needs it. */
|
|
|
PyErr_SetString(PyExc_ValueError,
|
|
|
"zstd decompression streams cannot be seeked with SEEK_END");
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
/* It is a bit inefficient to do this via the Python API. But since there
|
|
|
is a bit of state tracking involved to read from this type, it is the
|
|
|
easiest to implement. */
|
|
|
while (readAmount) {
|
|
|
Py_ssize_t readSize;
|
|
|
PyObject* readResult = PyObject_CallMethod((PyObject*)self, "read", "K",
|
|
|
readAmount < defaultOutSize ? readAmount : defaultOutSize);
|
|
|
|
|
|
if (!readResult) {
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
readSize = PyBytes_GET_SIZE(readResult);
|
|
|
|
|
|
/* Empty read means EOF. */
|
|
|
if (!readSize) {
|
|
|
break;
|
|
|
}
|
|
|
|
|
|
readAmount -= readSize;
|
|
|
}
|
|
|
|
|
|
return PyLong_FromUnsignedLongLong(self->bytesDecompressed);
|
|
|
}
|
|
|
|
|
|
static PyObject* reader_tell(ZstdDecompressionReader* self) {
|
|
|
/* TODO should this raise OSError since stream isn't seekable? */
|
|
|
return PyLong_FromUnsignedLongLong(self->bytesDecompressed);
|
|
|
}
|
|
|
|
|
|
static PyObject* reader_write(PyObject* self, PyObject* args) {
|
|
|
set_unsupported_operation();
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
static PyObject* reader_writelines(PyObject* self, PyObject* args) {
|
|
|
set_unsupported_operation();
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
static PyObject* reader_iter(PyObject* self) {
|
|
|
set_unsupported_operation();
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
static PyObject* reader_iternext(PyObject* self) {
|
|
|
set_unsupported_operation();
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
static PyMethodDef reader_methods[] = {
|
|
|
{ "__enter__", (PyCFunction)reader_enter, METH_NOARGS,
|
|
|
PyDoc_STR("Enter a compression context") },
|
|
|
{ "__exit__", (PyCFunction)reader_exit, METH_VARARGS,
|
|
|
PyDoc_STR("Exit a compression context") },
|
|
|
{ "close", (PyCFunction)reader_close, METH_NOARGS,
|
|
|
PyDoc_STR("Close the stream so it cannot perform any more operations") },
|
|
|
{ "flush", (PyCFunction)reader_flush, METH_NOARGS, PyDoc_STR("no-ops") },
|
|
|
{ "isatty", (PyCFunction)reader_isatty, METH_NOARGS, PyDoc_STR("Returns False") },
|
|
|
{ "readable", (PyCFunction)reader_readable, METH_NOARGS,
|
|
|
PyDoc_STR("Returns True") },
|
|
|
{ "read", (PyCFunction)reader_read, METH_VARARGS | METH_KEYWORDS,
|
|
|
PyDoc_STR("read compressed data") },
|
|
|
{ "read1", (PyCFunction)reader_read1, METH_VARARGS | METH_KEYWORDS,
|
|
|
PyDoc_STR("read compressed data") },
|
|
|
{ "readinto", (PyCFunction)reader_readinto, METH_VARARGS, NULL },
|
|
|
{ "readinto1", (PyCFunction)reader_readinto1, METH_VARARGS, NULL },
|
|
|
{ "readall", (PyCFunction)reader_readall, METH_NOARGS, PyDoc_STR("Not implemented") },
|
|
|
{ "readline", (PyCFunction)reader_readline, METH_NOARGS, PyDoc_STR("Not implemented") },
|
|
|
{ "readlines", (PyCFunction)reader_readlines, METH_NOARGS, PyDoc_STR("Not implemented") },
|
|
|
{ "seek", (PyCFunction)reader_seek, METH_VARARGS, PyDoc_STR("Seek the stream") },
|
|
|
{ "seekable", (PyCFunction)reader_seekable, METH_NOARGS,
|
|
|
PyDoc_STR("Returns True") },
|
|
|
{ "tell", (PyCFunction)reader_tell, METH_NOARGS,
|
|
|
PyDoc_STR("Returns current number of bytes compressed") },
|
|
|
{ "writable", (PyCFunction)reader_writable, METH_NOARGS,
|
|
|
PyDoc_STR("Returns False") },
|
|
|
{ "write", (PyCFunction)reader_write, METH_VARARGS, PyDoc_STR("unsupported operation") },
|
|
|
{ "writelines", (PyCFunction)reader_writelines, METH_VARARGS, PyDoc_STR("unsupported operation") },
|
|
|
{ NULL, NULL }
|
|
|
};
|
|
|
|
|
|
static PyMemberDef reader_members[] = {
|
|
|
{ "closed", T_BOOL, offsetof(ZstdDecompressionReader, closed),
|
|
|
READONLY, "whether stream is closed" },
|
|
|
{ NULL }
|
|
|
};
|
|
|
|
|
|
PyTypeObject ZstdDecompressionReaderType = {
|
|
|
PyVarObject_HEAD_INIT(NULL, 0)
|
|
|
"zstd.ZstdDecompressionReader", /* tp_name */
|
|
|
sizeof(ZstdDecompressionReader), /* tp_basicsize */
|
|
|
0, /* tp_itemsize */
|
|
|
(destructor)reader_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, /* tp_flags */
|
|
|
0, /* tp_doc */
|
|
|
0, /* tp_traverse */
|
|
|
0, /* tp_clear */
|
|
|
0, /* tp_richcompare */
|
|
|
0, /* tp_weaklistoffset */
|
|
|
reader_iter, /* tp_iter */
|
|
|
reader_iternext, /* tp_iternext */
|
|
|
reader_methods, /* tp_methods */
|
|
|
reader_members, /* 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 decompressionreader_module_init(PyObject* mod) {
|
|
|
/* TODO make reader a sub-class of io.RawIOBase */
|
|
|
|
|
|
Py_TYPE(&ZstdDecompressionReaderType) = &PyType_Type;
|
|
|
if (PyType_Ready(&ZstdDecompressionReaderType) < 0) {
|
|
|
return;
|
|
|
}
|
|
|
}
|
|
|
|
