/* Given a path to a Zip file and a toc_entry, return the (uncompressed)
data as a new reference. */
static PyObject *
get_data(char *archive, PyObject *toc_entry)
{
PyObject *raw_data, *data = NULL, *decompress;
char *buf;
FILE *fp;
int err;
Py_ssize_t bytes_read = 0;
long l;
char *datapath;
long compress, data_size, file_size, file_offset;
long time, date, crc;
if (!PyArg_ParseTuple(toc_entry, "slllllll", &datapath, &compress,
&data_size, &file_size, &file_offset, &time,
&date, &crc)) {
return NULL;
}
fp = fopen(archive, "rb");
if (!fp) {
PyErr_Format(PyExc_IOError,
"zipimport: can not open file %s", archive);
return NULL;
}
/* Check to make sure the local file header is correct */
fseek(fp, file_offset, 0);
l = PyMarshal_ReadLongFromFile(fp);
if (l != 0x04034B50) {
/* Bad: Local File Header */
PyErr_Format(ZipImportError,
"bad local file header in %s",
archive);
fclose(fp);
return NULL;
}
fseek(fp, file_offset + 26, 0);
l = 30 + PyMarshal_ReadShortFromFile(fp) +
PyMarshal_ReadShortFromFile(fp); /* local header size */
file_offset += l; /* Start of file data */
raw_data = PyString_FromStringAndSize((char *)NULL, compress == 0 ?
data_size : data_size + 1);
if (raw_data == NULL) {
fclose(fp);
return NULL;
}
buf = PyString_AsString(raw_data);
err = fseek(fp, file_offset, 0);
if (err == 0)
bytes_read = fread(buf, 1, data_size, fp);
fclose(fp);
if (err || bytes_read != data_size) {
PyErr_SetString(PyExc_IOError,
"zipimport: can't read data");
Py_DECREF(raw_data);
return NULL;
}
if (compress != 0) {
buf[data_size] = 'Z'; /* saw this in zipfile.py */
data_size++;
}
buf[data_size] = '\0';
if (compress == 0) /* data is not compressed */
return raw_data;
/* Decompress with zlib */
decompress = get_decompress_func();
if (decompress == NULL) {
PyErr_SetString(ZipImportError,
"can't decompress data; "
"zlib not available");
goto error;
}
data = PyObject_CallFunction(decompress, "Oi", raw_data, -15);
error:
Py_DECREF(raw_data);
return data;
}
/* Given a path to a Zip file and a toc_entry, return the (uncompressed)
data as a new reference. */
static PyObject *
get_data(PyObject *archive, PyObject *toc_entry)
{
PyObject *raw_data = NULL, *data, *decompress;
char *buf;
FILE *fp;
PyObject *datapath;
unsigned short compress, time, date;
unsigned int crc;
Py_ssize_t data_size, file_size, bytes_size;
long file_offset, header_size;
unsigned char buffer[30];
const char *errmsg = NULL;
if (!PyArg_ParseTuple(toc_entry, "OHnnlHHI", &datapath, &compress,
&data_size, &file_size, &file_offset, &time,
&date, &crc)) {
return NULL;
}
if (data_size < 0) {
PyErr_Format(ZipImportError, "negative data size");
return NULL;
}
fp = _Py_fopen_obj(archive, "rb");
if (!fp) {
return NULL;
}
/* Check to make sure the local file header is correct */
if (fseek(fp, file_offset, 0) == -1) {
goto file_error;
}
if (fread(buffer, 1, 30, fp) != 30) {
goto eof_error;
}
if (get_uint32(buffer) != 0x04034B50u) {
/* Bad: Local File Header */
errmsg = "bad local file header";
goto invalid_header;
}
header_size = (unsigned int)30 +
get_uint16(buffer + 26) /* file name */ +
get_uint16(buffer + 28) /* extra field */;
if (file_offset > LONG_MAX - header_size) {
errmsg = "bad local file header size";
goto invalid_header;
}
file_offset += header_size; /* Start of file data */
if (data_size > LONG_MAX - 1) {
fclose(fp);
PyErr_NoMemory();
return NULL;
}
bytes_size = compress == 0 ? data_size : data_size + 1;
if (bytes_size == 0) {
bytes_size++;
}
raw_data = PyBytes_FromStringAndSize((char *)NULL, bytes_size);
if (raw_data == NULL) {
goto error;
}
buf = PyBytes_AsString(raw_data);
if (fseek(fp, file_offset, 0) == -1) {
goto file_error;
}
if (fread(buf, 1, data_size, fp) != (size_t)data_size) {
PyErr_SetString(PyExc_IOError,
"zipimport: can't read data");
goto error;
}
fclose(fp);
fp = NULL;
if (compress != 0) {
buf[data_size] = 'Z'; /* saw this in zipfile.py */
data_size++;
}
buf[data_size] = '\0';
if (compress == 0) { /* data is not compressed */
data = PyBytes_FromStringAndSize(buf, data_size);
Py_DECREF(raw_data);
return data;
}
/* Decompress with zlib */
decompress = get_decompress_func();
if (decompress == NULL) {
PyErr_SetString(ZipImportError,
"can't decompress data; "
"zlib not available");
goto error;
}
data = PyObject_CallFunction(decompress, "Oi", raw_data, -15);
Py_DECREF(decompress);
Py_DECREF(raw_data);
return data;
eof_error:
set_file_error(archive, !ferror(fp));
goto error;
file_error:
PyErr_Format(ZipImportError, "can't read Zip file: %R", archive);
goto error;
invalid_header:
assert(errmsg != NULL);
PyErr_Format(ZipImportError, "%s: %R", errmsg, archive);
goto error;
error:
if (fp != NULL) {
fclose(fp);
}
Py_XDECREF(raw_data);
return NULL;
}