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decompressoriterator.c
249 lines | 7.2 KiB | text/x-c | CLexer
/**
* 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"
#define min(a, b) (((a) < (b)) ? (a) : (b))
extern PyObject* ZstdError;
PyDoc_STRVAR(ZstdDecompressorIterator__doc__,
"Represents an iterator of decompressed data.\n"
);
static void ZstdDecompressorIterator_dealloc(ZstdDecompressorIterator* self) {
Py_XDECREF(self->decompressor);
Py_XDECREF(self->reader);
if (self->buffer.buf) {
PyBuffer_Release(&self->buffer);
memset(&self->buffer, 0, sizeof(self->buffer));
}
if (self->input.src) {
PyMem_Free((void*)self->input.src);
self->input.src = NULL;
}
PyObject_Del(self);
}
static PyObject* ZstdDecompressorIterator_iter(PyObject* self) {
Py_INCREF(self);
return self;
}
static DecompressorIteratorResult read_decompressor_iterator(ZstdDecompressorIterator* self) {
size_t zresult;
PyObject* chunk;
DecompressorIteratorResult result;
size_t oldInputPos = self->input.pos;
result.chunk = NULL;
chunk = PyBytes_FromStringAndSize(NULL, self->outSize);
if (!chunk) {
result.errored = 1;
return result;
}
self->output.dst = PyBytes_AsString(chunk);
self->output.size = self->outSize;
self->output.pos = 0;
Py_BEGIN_ALLOW_THREADS
zresult = ZSTD_decompressStream(self->decompressor->dctx, &self->output, &self->input);
Py_END_ALLOW_THREADS
/* We're done with the pointer. Nullify to prevent anyone from getting a
handle on a Python object. */
self->output.dst = NULL;
if (ZSTD_isError(zresult)) {
Py_DECREF(chunk);
PyErr_Format(ZstdError, "zstd decompress error: %s",
ZSTD_getErrorName(zresult));
result.errored = 1;
return result;
}
self->readCount += self->input.pos - oldInputPos;
/* Frame is fully decoded. Input exhausted and output sitting in buffer. */
if (0 == zresult) {
self->finishedInput = 1;
self->finishedOutput = 1;
}
/* If it produced output data, return it. */
if (self->output.pos) {
if (self->output.pos < self->outSize) {
if (safe_pybytes_resize(&chunk, self->output.pos)) {
Py_XDECREF(chunk);
result.errored = 1;
return result;
}
}
}
else {
Py_DECREF(chunk);
chunk = NULL;
}
result.errored = 0;
result.chunk = chunk;
return result;
}
static PyObject* ZstdDecompressorIterator_iternext(ZstdDecompressorIterator* self) {
PyObject* readResult = NULL;
char* readBuffer;
Py_ssize_t readSize;
Py_ssize_t bufferRemaining;
DecompressorIteratorResult result;
if (self->finishedOutput) {
PyErr_SetString(PyExc_StopIteration, "output flushed");
return NULL;
}
/* If we have data left in the input, consume it. */
if (self->input.pos < self->input.size) {
result = read_decompressor_iterator(self);
if (result.chunk || result.errored) {
return result.chunk;
}
/* Else fall through to get more data from input. */
}
read_from_source:
if (!self->finishedInput) {
if (self->reader) {
readResult = PyObject_CallMethod(self->reader, "read", "I", self->inSize);
if (!readResult) {
return NULL;
}
PyBytes_AsStringAndSize(readResult, &readBuffer, &readSize);
}
else {
assert(self->buffer.buf);
/* Only support contiguous C arrays for now */
assert(self->buffer.strides == NULL && self->buffer.suboffsets == NULL);
assert(self->buffer.itemsize == 1);
/* TODO avoid memcpy() below */
readBuffer = (char *)self->buffer.buf + self->bufferOffset;
bufferRemaining = self->buffer.len - self->bufferOffset;
readSize = min(bufferRemaining, (Py_ssize_t)self->inSize);
self->bufferOffset += readSize;
}
if (readSize) {
if (!self->readCount && self->skipBytes) {
assert(self->skipBytes < self->inSize);
if ((Py_ssize_t)self->skipBytes >= readSize) {
PyErr_SetString(PyExc_ValueError,
"skip_bytes larger than first input chunk; "
"this scenario is currently unsupported");
Py_XDECREF(readResult);
return NULL;
}
readBuffer = readBuffer + self->skipBytes;
readSize -= self->skipBytes;
}
/* Copy input into previously allocated buffer because it can live longer
than a single function call and we don't want to keep a ref to a Python
object around. This could be changed... */
memcpy((void*)self->input.src, readBuffer, readSize);
self->input.size = readSize;
self->input.pos = 0;
}
/* No bytes on first read must mean an empty input stream. */
else if (!self->readCount) {
self->finishedInput = 1;
self->finishedOutput = 1;
Py_XDECREF(readResult);
PyErr_SetString(PyExc_StopIteration, "empty input");
return NULL;
}
else {
self->finishedInput = 1;
}
/* We've copied the data managed by memory. Discard the Python object. */
Py_XDECREF(readResult);
}
result = read_decompressor_iterator(self);
if (result.errored || result.chunk) {
return result.chunk;
}
/* No new output data. Try again unless we know there is no more data. */
if (!self->finishedInput) {
goto read_from_source;
}
PyErr_SetString(PyExc_StopIteration, "input exhausted");
return NULL;
}
PyTypeObject ZstdDecompressorIteratorType = {
PyVarObject_HEAD_INIT(NULL, 0)
"zstd.ZstdDecompressorIterator", /* tp_name */
sizeof(ZstdDecompressorIterator), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)ZstdDecompressorIterator_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 */
ZstdDecompressorIterator__doc__, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
ZstdDecompressorIterator_iter, /* tp_iter */
(iternextfunc)ZstdDecompressorIterator_iternext, /* tp_iternext */
0, /* 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 decompressoriterator_module_init(PyObject* mod) {
Py_TYPE(&ZstdDecompressorIteratorType) = &PyType_Type;
if (PyType_Ready(&ZstdDecompressorIteratorType) < 0) {
return;
}
}