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Commit 45dba1da authored by Nadeem Vawda's avatar Nadeem Vawda
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Issue #14398: Fix size truncation and overflow bugs in bz2 module.

parent dd72b3f6
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Showing with 224 additions and 138 deletions
Lib/test/test_bz2.py
View file @ 45dba1da
#!/usr/bin/env python
from test import test_support
from test.test_support import TESTFN, import_module
from test.test_support import TESTFN, _4G, bigmemtest, import_module, findfile
import unittest
from cStringIO import StringIO
......@@ -24,6 +24,9 @@ class BaseTest(unittest.TestCase):
DATA = 'BZh91AY&SY.\xc8N\x18\x00\x01>_\x80\x00\x10@\x02\xff\xf0\x01\x07n\x00?\xe7\xff\xe00\x01\x99\xaa\x00\xc0\x03F\x86\x8c#&\x83F\x9a\x03\x06\xa6\xd0\xa6\x93M\x0fQ\xa7\xa8\x06\x804hh\x12$\x11\xa4i4\xf14S\xd2<Q\xb5\x0fH\xd3\xd4\xdd\xd5\x87\xbb\xf8\x94\r\x8f\xafI\x12\xe1\xc9\xf8/E\x00pu\x89\x12]\xc9\xbbDL\nQ\x0e\t1\x12\xdf\xa0\xc0\x97\xac2O9\x89\x13\x94\x0e\x1c7\x0ed\x95I\x0c\xaaJ\xa4\x18L\x10\x05#\x9c\xaf\xba\xbc/\x97\x8a#C\xc8\xe1\x8cW\xf9\xe2\xd0\xd6M\xa7\x8bXa<e\x84t\xcbL\xb3\xa7\xd9\xcd\xd1\xcb\x84.\xaf\xb3\xab\xab\xad`n}\xa0lh\tE,\x8eZ\x15\x17VH>\x88\xe5\xcd9gd6\x0b\n\xe9\x9b\xd5\x8a\x99\xf7\x08.K\x8ev\xfb\xf7xw\xbb\xdf\xa1\x92\xf1\xdd|/";\xa2\xba\x9f\xd5\xb1#A\xb6\xf6\xb3o\xc9\xc5y\\\xebO\xe7\x85\x9a\xbc\xb6f8\x952\xd5\xd7"%\x89>V,\xf7\xa6z\xe2\x9f\xa3\xdf\x11\x11"\xd6E)I\xa9\x13^\xca\xf3r\xd0\x03U\x922\xf26\xec\xb6\xed\x8b\xc3U\x13\x9d\xc5\x170\xa4\xfa^\x92\xacDF\x8a\x97\xd6\x19\xfe\xdd\xb8\xbd\x1a\x9a\x19\xa3\x80ankR\x8b\xe5\xd83]\xa9\xc6\x08\x82f\xf6\xb9"6l$\xb8j@\xc0\x8a\xb0l1..\xbak\x83ls\x15\xbc\xf4\xc1\x13\xbe\xf8E\xb8\x9d\r\xa8\x9dk\x84\xd3n\xfa\xacQ\x07\xb1%y\xaav\xb4\x08\xe0z\x1b\x16\xf5\x04\xe9\xcc\xb9\x08z\x1en7.G\xfc]\xc9\x14\xe1B@\xbb!8`'
DATA_CRLF = 'BZh91AY&SY\xaez\xbbN\x00\x01H\xdf\x80\x00\x12@\x02\xff\xf0\x01\x07n\x00?\xe7\xff\xe0@\x01\xbc\xc6`\x86*\x8d=M\xa9\x9a\x86\xd0L@\x0fI\xa6!\xa1\x13\xc8\x88jdi\x8d@\x03@\x1a\x1a\x0c\x0c\x83 \x00\xc4h2\x19\x01\x82D\x84e\t\xe8\x99\x89\x19\x1ah\x00\r\x1a\x11\xaf\x9b\x0fG\xf5(\x1b\x1f?\t\x12\xcf\xb5\xfc\x95E\x00ps\x89\x12^\xa4\xdd\xa2&\x05(\x87\x04\x98\x89u\xe40%\xb6\x19\'\x8c\xc4\x89\xca\x07\x0e\x1b!\x91UIFU%C\x994!DI\xd2\xfa\xf0\xf1N8W\xde\x13A\xf5\x9cr%?\x9f3;I45A\xd1\x8bT\xb1<l\xba\xcb_\xc00xY\x17r\x17\x88\x08\x08@\xa0\ry@\x10\x04$)`\xf2\xce\x89z\xb0s\xec\x9b.iW\x9d\x81\xb5-+t\x9f\x1a\'\x97dB\xf5x\xb5\xbe.[.\xd7\x0e\x81\xe7\x08\x1cN`\x88\x10\xca\x87\xc3!"\x80\x92R\xa1/\xd1\xc0\xe6mf\xac\xbd\x99\xcca\xb3\x8780>\xa4\xc7\x8d\x1a\\"\xad\xa1\xabyBg\x15\xb9l\x88\x88\x91k"\x94\xa4\xd4\x89\xae*\xa6\x0b\x10\x0c\xd6\xd4m\xe86\xec\xb5j\x8a\x86j\';\xca.\x01I\xf2\xaaJ\xe8\x88\x8cU+t3\xfb\x0c\n\xa33\x13r2\r\x16\xe0\xb3(\xbf\x1d\x83r\xe7M\xf0D\x1365\xd8\x88\xd3\xa4\x92\xcb2\x06\x04\\\xc1\xb0\xea//\xbek&\xd8\xe6+t\xe5\xa1\x13\xada\x16\xder5"w]\xa2i\xb7[\x97R \xe2IT\xcd;Z\x04dk4\xad\x8a\t\xd3\x81z\x10\xf1:^`\xab\x1f\xc5\xdc\x91N\x14$+\x9e\xae\xd3\x80'
with open(findfile("testbz2_bigmem.bz2"), "rb") as f:
DATA_BIGMEM = f.read()
if has_cmdline_bunzip2:
def decompress(self, data):
pop = subprocess.Popen("bunzip2", shell=True,
......@@ -43,6 +46,7 @@ class BaseTest(unittest.TestCase):
def decompress(self, data):
return bz2.decompress(data)
class BZ2FileTest(BaseTest):
"Test BZ2File type miscellaneous methods."
......@@ -346,6 +350,17 @@ class BZ2CompressorTest(BaseTest):
data += bz2c.flush()
self.assertEqual(self.decompress(data), self.TEXT)
@bigmemtest(_4G, memuse=1.25)
def testBigmem(self, size):
text = "a" * size
bz2c = bz2.BZ2Compressor()
data = bz2c.compress(text) + bz2c.flush()
del text
text = self.decompress(data)
self.assertEqual(len(text), size)
self.assertEqual(text.strip("a"), "")
class BZ2DecompressorTest(BaseTest):
def test_Constructor(self):
self.assertRaises(TypeError, BZ2Decompressor, 42)
......@@ -384,6 +399,15 @@ class BZ2DecompressorTest(BaseTest):
text = bz2d.decompress(self.DATA)
self.assertRaises(EOFError, bz2d.decompress, "anything")
@bigmemtest(_4G, memuse=1.25)
def testBigmem(self, size):
# Issue #14398: decompression fails when output data is >=2GB.
if size < _4G:
self.skipTest("Test needs 5GB of memory to run.")
text = bz2.BZ2Decompressor().decompress(self.DATA_BIGMEM)
self.assertEqual(len(text), _4G)
self.assertEqual(text.strip("\0"), "")
class FuncTest(BaseTest):
"Test module functions"
......@@ -407,6 +431,24 @@ class FuncTest(BaseTest):
# "Test decompress() function with incomplete data"
self.assertRaises(ValueError, bz2.decompress, self.DATA[:-10])
@bigmemtest(_4G, memuse=1.25)
def testCompressBigmem(self, size):
text = "a" * size
data = bz2.compress(text)
del text
text = self.decompress(data)
self.assertEqual(len(text), size)
self.assertEqual(text.strip("a"), "")
@bigmemtest(_4G, memuse=1.25)
def testDecompressBigmem(self, size):
# Issue #14398: decompression fails when output data is >=2GB.
if size < _4G:
self.skipTest("Test needs 5GB of memory to run.")
text = bz2.decompress(self.DATA_BIGMEM)
self.assertEqual(len(text), _4G)
self.assertEqual(text.strip("\0"), "")
def test_main():
test_support.run_unittest(
BZ2FileTest,
......
Misc/NEWS
View file @ 45dba1da
......@@ -122,6 +122,8 @@ Core and Builtins
Library
-------
- Issue #14398: Fix size truncation and overflow bugs in the bz2 module.
- Issue #5148: Ignore 'U' in mode given to gzip.open() and gzip.GzipFile().
- Issue #16220: wsgiref now always calls close() on an iterable response.
......
Modules/bz2module.c
View file @ 45dba1da
......@@ -41,23 +41,8 @@ typedef fpos_t Py_off_t;
#define MODE_READ_EOF 2
#define MODE_WRITE 3
#define BZ2FileObject_Check(v) (Py_TYPE(v) == &BZ2File_Type)
#ifdef BZ_CONFIG_ERROR
#if SIZEOF_LONG >= 8
#define BZS_TOTAL_OUT(bzs) \
(((long)bzs->total_out_hi32 << 32) + bzs->total_out_lo32)
#elif SIZEOF_LONG_LONG >= 8
#define BZS_TOTAL_OUT(bzs) \
(((PY_LONG_LONG)bzs->total_out_hi32 << 32) + bzs->total_out_lo32)
#else
#define BZS_TOTAL_OUT(bzs) \
bzs->total_out_lo32
#endif
#else /* ! BZ_CONFIG_ERROR */
#ifndef BZ_CONFIG_ERROR
#define BZ2_bzRead bzRead
#define BZ2_bzReadOpen bzReadOpen
......@@ -72,8 +57,6 @@ typedef fpos_t Py_off_t;
#define BZ2_bzDecompressInit bzDecompressInit
#define BZ2_bzDecompressEnd bzDecompressEnd
#define BZS_TOTAL_OUT(bzs) bzs->total_out
#endif /* ! BZ_CONFIG_ERROR */
......@@ -90,6 +73,8 @@ typedef fpos_t Py_off_t;
#define RELEASE_LOCK(obj)
#endif
#define MIN(X, Y) (((X) < (Y)) ? (X) : (Y))
/* Bits in f_newlinetypes */
#define NEWLINE_UNKNOWN 0 /* No newline seen, yet */
#define NEWLINE_CR 1 /* \r newline seen */
......@@ -234,6 +219,20 @@ Util_NewBufferSize(size_t currentsize)
return currentsize + (currentsize >> 3) + 6;
}
static int
Util_GrowBuffer(PyObject **buf)
{
size_t size = PyString_GET_SIZE(*buf);
size_t new_size = Util_NewBufferSize(size);
if (new_size > size) {
return _PyString_Resize(buf, new_size);
} else { /* overflow */
PyErr_SetString(PyExc_OverflowError,
"Unable to allocate buffer - output too large");
return -1;
}
}
/* This is a hacked version of Python's fileobject.c:get_line(). */
static PyObject *
Util_GetLine(BZ2FileObject *f, int n)
......@@ -1608,20 +1607,16 @@ static PyObject *
BZ2Comp_compress(BZ2CompObject *self, PyObject *args)
{
Py_buffer pdata;
char *data;
int datasize;
int bufsize = SMALLCHUNK;
PY_LONG_LONG totalout;
size_t input_left;
size_t output_size = 0;
PyObject *ret = NULL;
bz_stream *bzs = &self->bzs;
int bzerror;
if (!PyArg_ParseTuple(args, "s*:compress", &pdata))
return NULL;
data = pdata.buf;
datasize = pdata.len;
if (datasize == 0) {
if (pdata.len == 0) {
PyBuffer_Release(&pdata);
return PyString_FromString("");
}
......@@ -1633,40 +1628,52 @@ BZ2Comp_compress(BZ2CompObject *self, PyObject *args)
goto error;
}
ret = PyString_FromStringAndSize(NULL, bufsize);
ret = PyString_FromStringAndSize(NULL, SMALLCHUNK);
if (!ret)
goto error;
bzs->next_in = data;
bzs->avail_in = datasize;
bzs->next_out = BUF(ret);
bzs->avail_out = bufsize;
bzs->next_in = pdata.buf;
bzs->avail_in = MIN(pdata.len, UINT_MAX);
input_left = pdata.len - bzs->avail_in;
totalout = BZS_TOTAL_OUT(bzs);
bzs->next_out = BUF(ret);
bzs->avail_out = PyString_GET_SIZE(ret);
for (;;) {
char *saved_next_out;
Py_BEGIN_ALLOW_THREADS
saved_next_out = bzs->next_out;
bzerror = BZ2_bzCompress(bzs, BZ_RUN);
output_size += bzs->next_out - saved_next_out;
Py_END_ALLOW_THREADS
if (bzerror != BZ_RUN_OK) {
Util_CatchBZ2Error(bzerror);
goto error;
}
if (bzs->avail_in == 0)
break; /* no more input data */
if (bzs->avail_in == 0) {
if (input_left == 0)
break; /* no more input data */
bzs->avail_in = MIN(input_left, UINT_MAX);
input_left -= bzs->avail_in;
}
if (bzs->avail_out == 0) {
bufsize = Util_NewBufferSize(bufsize);
if (_PyString_Resize(&ret, bufsize) < 0) {
BZ2_bzCompressEnd(bzs);
goto error;
size_t buffer_left = PyString_GET_SIZE(ret) - output_size;
if (buffer_left == 0) {
if (Util_GrowBuffer(&ret) < 0) {
BZ2_bzCompressEnd(bzs);
goto error;
}
bzs->next_out = BUF(ret) + output_size;
buffer_left = PyString_GET_SIZE(ret) - output_size;
}
bzs->next_out = BUF(ret) + (BZS_TOTAL_OUT(bzs)
- totalout);
bzs->avail_out = bufsize - (bzs->next_out - BUF(ret));
bzs->avail_out = MIN(buffer_left, UINT_MAX);
}
}
_PyString_Resize(&ret, (Py_ssize_t)(BZS_TOTAL_OUT(bzs) - totalout));
if (_PyString_Resize(&ret, output_size) < 0)
goto error;
RELEASE_LOCK(self);
PyBuffer_Release(&pdata);
......@@ -1689,33 +1696,34 @@ You must not use the compressor object after calling this method.\n\
static PyObject *
BZ2Comp_flush(BZ2CompObject *self)
{
int bufsize = SMALLCHUNK;
size_t output_size = 0;
PyObject *ret = NULL;
bz_stream *bzs = &self->bzs;
PY_LONG_LONG totalout;
int bzerror;
ACQUIRE_LOCK(self);
if (!self->running) {
PyErr_SetString(PyExc_ValueError, "object was already "
"flushed");
PyErr_SetString(PyExc_ValueError, "object was already flushed");
goto error;
}
self->running = 0;
ret = PyString_FromStringAndSize(NULL, bufsize);
ret = PyString_FromStringAndSize(NULL, SMALLCHUNK);
if (!ret)
goto error;
bzs->next_out = BUF(ret);
bzs->avail_out = bufsize;
totalout = BZS_TOTAL_OUT(bzs);
bzs->avail_out = PyString_GET_SIZE(ret);
for (;;) {
char *saved_next_out;
Py_BEGIN_ALLOW_THREADS
saved_next_out = bzs->next_out;
bzerror = BZ2_bzCompress(bzs, BZ_FINISH);
output_size += bzs->next_out - saved_next_out;
Py_END_ALLOW_THREADS
if (bzerror == BZ_STREAM_END) {
break;
} else if (bzerror != BZ_FINISH_OK) {
......@@ -1723,18 +1731,20 @@ BZ2Comp_flush(BZ2CompObject *self)
goto error;
}
if (bzs->avail_out == 0) {
bufsize = Util_NewBufferSize(bufsize);
if (_PyString_Resize(&ret, bufsize) < 0)
goto error;
bzs->next_out = BUF(ret);
bzs->next_out = BUF(ret) + (BZS_TOTAL_OUT(bzs)
- totalout);
bzs->avail_out = bufsize - (bzs->next_out - BUF(ret));
size_t buffer_left = PyString_GET_SIZE(ret) - output_size;
if (buffer_left == 0) {
if (Util_GrowBuffer(&ret) < 0)
goto error;
bzs->next_out = BUF(ret) + output_size;
buffer_left = PyString_GET_SIZE(ret) - output_size;
}
bzs->avail_out = MIN(buffer_left, UINT_MAX);
}
}
if (bzs->avail_out != 0)
_PyString_Resize(&ret, (Py_ssize_t)(BZS_TOTAL_OUT(bzs) - totalout));
if (output_size != PyString_GET_SIZE(ret))
if (_PyString_Resize(&ret, output_size) < 0)
goto error;
RELEASE_LOCK(self);
return ret;
......@@ -1899,18 +1909,14 @@ static PyObject *
BZ2Decomp_decompress(BZ2DecompObject *self, PyObject *args)
{
Py_buffer pdata;
char *data;
int datasize;
int bufsize = SMALLCHUNK;
PY_LONG_LONG totalout;
size_t input_left;
size_t output_size = 0;
PyObject *ret = NULL;
bz_stream *bzs = &self->bzs;
int bzerror;
if (!PyArg_ParseTuple(args, "s*:decompress", &pdata))
return NULL;
data = pdata.buf;
datasize = pdata.len;
ACQUIRE_LOCK(self);
if (!self->running) {
......@@ -1919,52 +1925,65 @@ BZ2Decomp_decompress(BZ2DecompObject *self, PyObject *args)
goto error;
}
ret = PyString_FromStringAndSize(NULL, bufsize);
ret = PyString_FromStringAndSize(NULL, SMALLCHUNK);
if (!ret)
goto error;
bzs->next_in = data;
bzs->avail_in = datasize;
bzs->next_out = BUF(ret);
bzs->avail_out = bufsize;
bzs->next_in = pdata.buf;
bzs->avail_in = MIN(pdata.len, UINT_MAX);
input_left = pdata.len - bzs->avail_in;
totalout = BZS_TOTAL_OUT(bzs);
bzs->next_out = BUF(ret);
bzs->avail_out = PyString_GET_SIZE(ret);
for (;;) {
char *saved_next_out;
Py_BEGIN_ALLOW_THREADS
saved_next_out = bzs->next_out;
bzerror = BZ2_bzDecompress(bzs);
output_size += bzs->next_out - saved_next_out;
Py_END_ALLOW_THREADS
if (bzerror == BZ_STREAM_END) {
if (bzs->avail_in != 0) {
self->running = 0;
input_left += bzs->avail_in;
if (input_left != 0) {
Py_DECREF(self->unused_data);
self->unused_data =
PyString_FromStringAndSize(bzs->next_in,
bzs->avail_in);
PyString_FromStringAndSize(bzs->next_in, input_left);
if (self->unused_data == NULL)
goto error;
}
self->running = 0;
break;
}
if (bzerror != BZ_OK) {
Util_CatchBZ2Error(bzerror);
goto error;
}
if (bzs->avail_in == 0)
break; /* no more input data */
if (bzs->avail_in == 0) {
if (input_left == 0)
break; /* no more input data */
bzs->avail_in = MIN(input_left, UINT_MAX);
input_left -= bzs->avail_in;
}
if (bzs->avail_out == 0) {
bufsize = Util_NewBufferSize(bufsize);
if (_PyString_Resize(&ret, bufsize) < 0) {
BZ2_bzDecompressEnd(bzs);
goto error;
size_t buffer_left = PyString_GET_SIZE(ret) - output_size;
if (buffer_left == 0) {
if (Util_GrowBuffer(&ret) < 0) {
BZ2_bzDecompressEnd(bzs);
goto error;
}
bzs->next_out = BUF(ret) + output_size;
buffer_left = PyString_GET_SIZE(ret) - output_size;
}
bzs->next_out = BUF(ret);
bzs->next_out = BUF(ret) + (BZS_TOTAL_OUT(bzs)
- totalout);
bzs->avail_out = bufsize - (bzs->next_out - BUF(ret));
bzs->avail_out = MIN(buffer_left, UINT_MAX);
}
}
if (bzs->avail_out != 0)
_PyString_Resize(&ret, (Py_ssize_t)(BZS_TOTAL_OUT(bzs) - totalout));
if (output_size != PyString_GET_SIZE(ret))
if (_PyString_Resize(&ret, output_size) < 0)
goto error;
RELEASE_LOCK(self);
PyBuffer_Release(&pdata);
......@@ -2111,10 +2130,10 @@ static PyObject *
bz2_compress(PyObject *self, PyObject *args, PyObject *kwargs)
{
int compresslevel=9;
int action;
Py_buffer pdata;
char *data;
int datasize;
int bufsize;
size_t input_left;
size_t output_size = 0;
PyObject *ret = NULL;
bz_stream _bzs;
bz_stream *bzs = &_bzs;
......@@ -2125,8 +2144,6 @@ bz2_compress(PyObject *self, PyObject *args, PyObject *kwargs)
kwlist, &pdata,
&compresslevel))
return NULL;
data = pdata.buf;
datasize = pdata.len;
if (compresslevel < 1 || compresslevel > 9) {
PyErr_SetString(PyExc_ValueError,
......@@ -2135,11 +2152,7 @@ bz2_compress(PyObject *self, PyObject *args, PyObject *kwargs)
return NULL;
}
/* Conforming to bz2 manual, this is large enough to fit compressed
* data in one shot. We will check it later anyway. */
bufsize = datasize + (datasize/100+1) + 600;
ret = PyString_FromStringAndSize(NULL, bufsize);
ret = PyString_FromStringAndSize(NULL, SMALLCHUNK);
if (!ret) {
PyBuffer_Release(&pdata);
return NULL;
......@@ -2147,10 +2160,12 @@ bz2_compress(PyObject *self, PyObject *args, PyObject *kwargs)
memset(bzs, 0, sizeof(bz_stream));
bzs->next_in = data;
bzs->avail_in = datasize;
bzs->next_in = pdata.buf;
bzs->avail_in = MIN(pdata.len, UINT_MAX);
input_left = pdata.len - bzs->avail_in;
bzs->next_out = BUF(ret);
bzs->avail_out = bufsize;
bzs->avail_out = PyString_GET_SIZE(ret);
bzerror = BZ2_bzCompressInit(bzs, compresslevel, 0, 0);
if (bzerror != BZ_OK) {
......@@ -2160,36 +2175,53 @@ bz2_compress(PyObject *self, PyObject *args, PyObject *kwargs)
return NULL;
}
action = BZ_RUN;
for (;;) {
char *saved_next_out;
Py_BEGIN_ALLOW_THREADS
bzerror = BZ2_bzCompress(bzs, BZ_FINISH);
saved_next_out = bzs->next_out;
bzerror = BZ2_bzCompress(bzs, action);
output_size += bzs->next_out - saved_next_out;
Py_END_ALLOW_THREADS
if (bzerror == BZ_STREAM_END) {
break;
} else if (bzerror != BZ_FINISH_OK) {
} else if (bzerror != BZ_RUN_OK && bzerror != BZ_FINISH_OK) {
BZ2_bzCompressEnd(bzs);
Util_CatchBZ2Error(bzerror);
PyBuffer_Release(&pdata);
Py_DECREF(ret);
return NULL;
}
if (action == BZ_RUN && bzs->avail_in == 0) {
if (input_left == 0) {
action = BZ_FINISH;
} else {
bzs->avail_in = MIN(input_left, UINT_MAX);
input_left -= bzs->avail_in;
}
}
if (bzs->avail_out == 0) {
bufsize = Util_NewBufferSize(bufsize);
if (_PyString_Resize(&ret, bufsize) < 0) {
BZ2_bzCompressEnd(bzs);
PyBuffer_Release(&pdata);
Py_DECREF(ret);
return NULL;
size_t buffer_left = PyString_GET_SIZE(ret) - output_size;
if (buffer_left == 0) {
if (Util_GrowBuffer(&ret) < 0) {
BZ2_bzCompressEnd(bzs);
PyBuffer_Release(&pdata);
return NULL;
}
bzs->next_out = BUF(ret) + output_size;
buffer_left = PyString_GET_SIZE(ret) - output_size;
}
bzs->next_out = BUF(ret) + BZS_TOTAL_OUT(bzs);
bzs->avail_out = bufsize - (bzs->next_out - BUF(ret));
bzs->avail_out = MIN(buffer_left, UINT_MAX);
}
}
if (bzs->avail_out != 0)
_PyString_Resize(&ret, (Py_ssize_t)BZS_TOTAL_OUT(bzs));
BZ2_bzCompressEnd(bzs);
if (output_size != PyString_GET_SIZE(ret))
_PyString_Resize(&ret, output_size); /* Sets ret to NULL on failure. */
BZ2_bzCompressEnd(bzs);
PyBuffer_Release(&pdata);
return ret;
}
......@@ -2205,9 +2237,8 @@ static PyObject *
bz2_decompress(PyObject *self, PyObject *args)
{
Py_buffer pdata;
char *data;
int datasize;
int bufsize = SMALLCHUNK;
size_t input_left;
size_t output_size = 0;
PyObject *ret;
bz_stream _bzs;
bz_stream *bzs = &_bzs;
......@@ -2215,15 +2246,13 @@ bz2_decompress(PyObject *self, PyObject *args)
if (!PyArg_ParseTuple(args, "s*:decompress", &pdata))
return NULL;
data = pdata.buf;
datasize = pdata.len;
if (datasize == 0) {
if (pdata.len == 0) {
PyBuffer_Release(&pdata);
return PyString_FromString("");
}
ret = PyString_FromStringAndSize(NULL, bufsize);
ret = PyString_FromStringAndSize(NULL, SMALLCHUNK);
if (!ret) {
PyBuffer_Release(&pdata);
return NULL;
......@@ -2231,10 +2260,12 @@ bz2_decompress(PyObject *self, PyObject *args)
memset(bzs, 0, sizeof(bz_stream));
bzs->next_in = data;
bzs->avail_in = datasize;
bzs->next_in = pdata.buf;
bzs->avail_in = MIN(pdata.len, UINT_MAX);
input_left = pdata.len - bzs->avail_in;
bzs->next_out = BUF(ret);
bzs->avail_out = bufsize;
bzs->avail_out = PyString_GET_SIZE(ret);
bzerror = BZ2_bzDecompressInit(bzs, 0, 0);
if (bzerror != BZ_OK) {
......@@ -2245,9 +2276,14 @@ bz2_decompress(PyObject *self, PyObject *args)
}
for (;;) {
char *saved_next_out;
Py_BEGIN_ALLOW_THREADS
saved_next_out = bzs->next_out;
bzerror = BZ2_bzDecompress(bzs);
output_size += bzs->next_out - saved_next_out;
Py_END_ALLOW_THREADS
if (bzerror == BZ_STREAM_END) {
break;
} else if (bzerror != BZ_OK) {
......@@ -2258,31 +2294,37 @@ bz2_decompress(PyObject *self, PyObject *args)
return NULL;
}
if (bzs->avail_in == 0) {
BZ2_bzDecompressEnd(bzs);
PyErr_SetString(PyExc_ValueError,
"couldn't find end of stream");
PyBuffer_Release(&pdata);
Py_DECREF(ret);
return NULL;
}
if (bzs->avail_out == 0) {
bufsize = Util_NewBufferSize(bufsize);
if (_PyString_Resize(&ret, bufsize) < 0) {
if (input_left == 0) {
BZ2_bzDecompressEnd(bzs);
PyErr_SetString(PyExc_ValueError,
"couldn't find end of stream");
PyBuffer_Release(&pdata);
Py_DECREF(ret);
return NULL;
}
bzs->next_out = BUF(ret) + BZS_TOTAL_OUT(bzs);
bzs->avail_out = bufsize - (bzs->next_out - BUF(ret));
bzs->avail_in = MIN(input_left, UINT_MAX);
input_left -= bzs->avail_in;
}
if (bzs->avail_out == 0) {
size_t buffer_left = PyString_GET_SIZE(ret) - output_size;
if (buffer_left == 0) {
if (Util_GrowBuffer(&ret) < 0) {
BZ2_bzDecompressEnd(bzs);
PyBuffer_Release(&pdata);
return NULL;
}
bzs->next_out = BUF(ret) + output_size;
buffer_left = PyString_GET_SIZE(ret) - output_size;
}
bzs->avail_out = MIN(buffer_left, UINT_MAX);
}
}
if (bzs->avail_out != 0)
_PyString_Resize(&ret, (Py_ssize_t)BZS_TOTAL_OUT(bzs));
if (output_size != PyString_GET_SIZE(ret))
_PyString_Resize(&ret, output_size); /* Sets ret to NULL on failure. */
BZ2_bzDecompressEnd(bzs);
PyBuffer_Release(&pdata);
return ret;
}
......
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