comparison contrib/python-zstandard/c-ext/decompressobj.c @ 40121:73fef626dae3

zstandard: vendor python-zstandard 0.10.1

This was just released.

The upstream source distribution from PyPI was extracted. Unwanted
files were removed.

The clang-format ignore list was updated to reflect the new source
of files.

setup.py was updated to pass a new argument to python-zstandard's
function for returning an Extension instance. Upstream had to change
to use relative paths because Python 3.7's packaging doesn't
seem to like absolute paths when defining sources, includes, etc.
The default relative path calculation is relative to setup_zstd.py
which is different from the directory of Mercurial's setup.py.

The project contains a vendored copy of zstandard 1.3.6. The old
version was 1.3.4.

The API should be backwards compatible and nothing in core should
need adjusted. However, there is a new "chunker" API that we
may find useful in places where we want to emit compressed chunks
of a fixed size.

There are a pair of bug fixes in 0.10.0 with regards to
compressobj() and decompressobj() when block flushing is used. I
actually found these bugs when introducing these APIs in Mercurial!
But existing Mercurial code is not affected because we don't
perform block flushing.

# no-check-commit because 3rd party code has different style guidelines

Differential Revision: https://phab.mercurial-scm.org/D4911

40120:89742f1fa6cb

	ZSTD_inBuffer input;
	ZSTD_outBuffer output;
	PyObject* result = NULL;
	Py_ssize_t resultSize = 0;

	if (self->finished) {
		PyErr_SetString(ZstdError, "cannot use a decompressobj multiple times");
		return NULL;
	}

		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;

	output.dst = PyMem_Malloc(self->outSize);

		goto except;
	}
	output.size = self->outSize;
	output.pos = 0;

	/* Read input until exhausted. */
	while (input.pos < input.size) {
		Py_BEGIN_ALLOW_THREADS
		zresult = ZSTD_decompress_generic(self->decompressor->dctx, &output, &input);
		Py_END_ALLOW_THREADS

		if (ZSTD_isError(zresult)) {

				result = PyBytes_FromStringAndSize(output.dst, output.pos);
				if (!result) {
					goto except;
				}
			}

			output.pos = 0;
		}
	}

	if (!result) {
		result = PyBytes_FromString("");
	}

40121:73fef626dae3

	ZSTD_inBuffer input;
	ZSTD_outBuffer output;
	PyObject* result = NULL;
	Py_ssize_t resultSize = 0;

	output.dst = NULL;

	if (self->finished) {
		PyErr_SetString(ZstdError, "cannot use a decompressobj multiple times");
		return NULL;
	}

		PyErr_SetString(PyExc_ValueError,
			"data buffer should be contiguous and have at most one dimension");
		goto finally;
	}

	/* Special case of empty input. Output will always be empty. */
	if (source.len == 0) {
		result = PyBytes_FromString("");
		goto finally;
	}

	input.src = source.buf;
	input.size = source.len;
	input.pos = 0;

	output.dst = PyMem_Malloc(self->outSize);

		goto except;
	}
	output.size = self->outSize;
	output.pos = 0;

	while (1) {
		Py_BEGIN_ALLOW_THREADS
		zresult = ZSTD_decompress_generic(self->decompressor->dctx, &output, &input);
		Py_END_ALLOW_THREADS

		if (ZSTD_isError(zresult)) {

				result = PyBytes_FromStringAndSize(output.dst, output.pos);
				if (!result) {
					goto except;
				}
			}
		}

		if (zresult == 0 || (input.pos == input.size && output.pos == 0)) {
			break;
		}

		output.pos = 0;
	}

	if (!result) {
		result = PyBytes_FromString("");
	}