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#include "blob.h"
#include "util.h"
int pysqlite_blob_init(pysqlite_Blob *self, pysqlite_Connection* connection, sqlite3_blob *blob)
{
Py_INCREF(connection);
self->connection = connection;
self->offset=0;
self->blob = blob;
self->in_weakreflist = NULL;
if (!pysqlite_check_thread(self->connection)){
return -1;
}
return 0;
}
static void remove_blob_from_connection_blob_list(pysqlite_Blob* self)
{
Py_ssize_t i;
for(i=0;i<PyList_GET_SIZE(self->connection->blobs);i++)
{
if(PyWeakref_GetObject(PyList_GET_ITEM(self->connection->blobs, i))==(PyObject *)self)
{
PyList_SetSlice(self->connection->blobs, i, i+1, NULL);
break;
}
}
}
static void pysqlite_blob_dealloc(pysqlite_Blob* self)
{
/* close the blob */
if (self->blob) {
Py_BEGIN_ALLOW_THREADS
sqlite3_blob_close(self->blob);
Py_END_ALLOW_THREADS
}
// remove from connection weaklist
remove_blob_from_connection_blob_list(self);
if (self->in_weakreflist != NULL) {
PyObject_ClearWeakRefs((PyObject*)self);
}
Py_XDECREF(self->connection);
self->blob = NULL;
self->ob_type->tp_free((PyObject*)self);
}
/*
* Checks if a blob object is usable (i. e. not closed).
*
* 0 => error; 1 => ok
*/
int pysqlite_check_blob(pysqlite_Blob* blob)
{
if (!blob->blob) {
PyErr_SetString(pysqlite_ProgrammingError, "Cannot operate on a closed blob.");
return 0;
} else if (!pysqlite_check_connection(blob->connection) || !pysqlite_check_thread(blob->connection)) {
return 0;
} else {
return 1;
}
}
PyObject* pysqlite_blob_close(pysqlite_Blob *self){
if (!pysqlite_check_blob(self)){
return NULL;
}
/* close the blob */
if (self->blob) {
Py_BEGIN_ALLOW_THREADS
sqlite3_blob_close(self->blob);
Py_END_ALLOW_THREADS
}
self->blob = NULL;
// remove from connection weaklist
remove_blob_from_connection_blob_list(self);
if (self->in_weakreflist != NULL) {
PyObject_ClearWeakRefs((PyObject*)self);
}
Py_RETURN_NONE;
};
PyObject* pysqlite_blob_length(pysqlite_Blob *self){
int blob_length;
if (!pysqlite_check_blob(self)){
return NULL;
}
Py_BEGIN_ALLOW_THREADS
blob_length = sqlite3_blob_bytes(self->blob);
Py_END_ALLOW_THREADS
return PyInt_FromLong(blob_length);
};
PyObject* pysqlite_blob_read(pysqlite_Blob *self, PyObject *args){
int read_length = -1;
int blob_length = 0;
PyObject* buffer;
char* raw_buffer;
int rc;
if (!PyArg_ParseTuple(args, "|i", &read_length)) {
return NULL;
}
if (!pysqlite_check_blob(self)){
return NULL;
}
//TODO: make this multithreaded and safe!
Py_BEGIN_ALLOW_THREADS
blob_length = sqlite3_blob_bytes(self->blob);
Py_END_ALLOW_THREADS
if (read_length < 0) {
// same as file read.
read_length = blob_length;
}
// making sure we don't read more then blob size
if (self->offset + read_length > blob_length){
read_length = blob_length - self->offset;
}
buffer = PyBytes_FromStringAndSize(NULL, read_length);
if (!buffer) {
return NULL;
}
raw_buffer = PyBytes_AS_STRING(buffer);
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_blob_read(self->blob, raw_buffer, read_length, self->offset);
Py_END_ALLOW_THREADS
if (rc != SQLITE_OK){
Py_DECREF(buffer);
// For some reasone after modifieng blob the error is not set on the connection db.
if (rc == SQLITE_ABORT){
PyErr_SetString(pysqlite_OperationalError, "Cannot operate on modified blob");
} else {
_pysqlite_seterror(self->connection->db, NULL);
}
return NULL;
}
// update offset.
self->offset += read_length;
return buffer;
};
PyObject* pysqlite_blob_write(pysqlite_Blob *self, PyObject *data){
Py_ssize_t data_size;
char *data_buffer;
int rc;
if (PyBytes_AsStringAndSize(data, &data_buffer, &data_size)){
return NULL;
}
if (!pysqlite_check_blob(self)){
return NULL;
}
//TODO: throw better error on data bigger then blob.
Py_BEGIN_ALLOW_THREADS
rc = sqlite3_blob_write(self->blob, data_buffer, data_size, self->offset);
Py_END_ALLOW_THREADS
if (rc != SQLITE_OK) {
// For some reasone after modifieng blob the error is not set on the connection db.
if (rc == SQLITE_ABORT){
PyErr_SetString(pysqlite_OperationalError, "Cannot operate on modified blob");
} else {
_pysqlite_seterror(self->connection->db, NULL);
}
return NULL;
}
self->offset += (int)data_size;
Py_RETURN_NONE;
}
PyObject* pysqlite_blob_seek(pysqlite_Blob *self, PyObject *args){
int blob_length, offset, from_what=0;
if(!PyArg_ParseTuple(args, "i|i", &offset, &from_what)){
return NULL;
}
if (!pysqlite_check_blob(self)){
return NULL;
}
Py_BEGIN_ALLOW_THREADS
blob_length = sqlite3_blob_bytes(self->blob);
Py_END_ALLOW_THREADS
switch(from_what){
case 0: //realtive to blob begin
break;
case 1: //realtive to current position
offset = self->offset + offset;
break;
case 2: //realtive to blob end
offset = blob_length + offset;
break;
default:
return PyErr_Format(PyExc_ValueError, "from_what should be 0, 1 or 2");
}
if (offset < 0 || offset > blob_length){
return PyErr_Format(PyExc_ValueError, "offset out of blob range");
}
self->offset = offset;
Py_RETURN_NONE;
};
PyObject* pysqlite_blob_tell(pysqlite_Blob *self){
if (!pysqlite_check_blob(self)){
return NULL;
}
return PyInt_FromLong(self->offset);
}
PyObject* pysqlite_blob_enter(pysqlite_Blob *self){
if (!pysqlite_check_blob(self)){
return NULL;
}
Py_INCREF(self);
return (PyObject *)self;
}
PyObject* pysqlite_blob_exit(pysqlite_Blob *self, PyObject *args){
PyObject *res;
if (!pysqlite_check_blob(self)){
return NULL;
}
res = pysqlite_blob_close(self);
Py_XDECREF(res);
if (!res) {
return NULL;
}
Py_RETURN_FALSE;
}
static PyMethodDef blob_methods[] = {
{"length", (PyCFunction)pysqlite_blob_length, METH_NOARGS,
PyDoc_STR("return blob length")},
{"read", (PyCFunction)pysqlite_blob_read, METH_VARARGS,
PyDoc_STR("read data from blob")},
{"write", (PyCFunction)pysqlite_blob_write, METH_O,
PyDoc_STR("write data to blob")},
{"close", (PyCFunction)pysqlite_blob_close, METH_NOARGS,
PyDoc_STR("close blob")},
{"seek", (PyCFunction)pysqlite_blob_seek, METH_VARARGS,
PyDoc_STR("change blob current offset")},
{"tell", (PyCFunction)pysqlite_blob_tell, METH_NOARGS,
PyDoc_STR("return blob current offset")},
{"__enter__", (PyCFunction)pysqlite_blob_enter, METH_NOARGS,
PyDoc_STR("blob context manager enter")},
{"__exit__", (PyCFunction)pysqlite_blob_exit, METH_VARARGS,
PyDoc_STR("blob context manager exit")},
{NULL, NULL}
};
PyTypeObject pysqlite_BlobType = {
PyVarObject_HEAD_INIT(NULL, 0)
MODULE_NAME ".Blob", /* tp_name */
sizeof(pysqlite_Blob), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)pysqlite_blob_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_HAVE_WEAKREFS, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
offsetof(pysqlite_Blob, in_weakreflist), /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
blob_methods, /* 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 */
(initproc)pysqlite_blob_init, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
0 /* tp_free */
};
extern int pysqlite_blob_setup_types(void)
{
pysqlite_BlobType.tp_new = PyType_GenericNew;
return PyType_Ready(&pysqlite_BlobType);
}
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