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//-----------------------------------------------------------------------------
// Copyright (c) 2016, 2020, Oracle and/or its affiliates. All rights reserved.
//
// Portions Copyright 2007-2015, Anthony Tuininga. All rights reserved.
//
// Portions Copyright 2001-2007, Computronix (Canada) Ltd., Edmonton, Alberta,
// Canada. All rights reserved.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// cxoLob.c
// Defines the routines for handling LOB values.
//-----------------------------------------------------------------------------
#include "cxoModule.h"
//-----------------------------------------------------------------------------
// cxoLob_new()
// Create a new LOB.
//-----------------------------------------------------------------------------
PyObject *cxoLob_new(cxoConnection *connection, cxoDbType *dbType,
dpiLob *handle)
{
cxoLob *lob;
lob = (cxoLob*) cxoPyTypeLob.tp_alloc(&cxoPyTypeLob, 0);
if (!lob)
return NULL;
lob->handle = handle;
Py_INCREF(connection);
lob->connection = connection;
Py_INCREF(dbType);
lob->dbType = dbType;
return (PyObject*) lob;
}
//-----------------------------------------------------------------------------
// cxoLob_free()
// Free a LOB.
//-----------------------------------------------------------------------------
static void cxoLob_free(cxoLob *lob)
{
if (lob->handle) {
dpiLob_release(lob->handle);
lob->handle = NULL;
}
Py_CLEAR(lob->dbType);
Py_CLEAR(lob->connection);
Py_TYPE(lob)->tp_free((PyObject*) lob);
}
//-----------------------------------------------------------------------------
// cxoLob_internalRead()
// Return a portion (or all) of the data in the LOB.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_internalRead(cxoLob *lob, uint64_t offset,
uint64_t amount)
{
uint64_t bufferSize;
PyObject *result;
char *buffer;
int status;
// modify the arguments
if (amount == (uint64_t)(-1)) {
if (dpiLob_getSize(lob->handle, &amount) < 0)
return cxoError_raiseAndReturnNull();
if (amount >= offset)
amount = amount - offset + 1;
else amount = 1;
}
// create a buffer of the correct size
if (dpiLob_getBufferSize(lob->handle, amount, &bufferSize) < 0)
return cxoError_raiseAndReturnNull();
buffer = (char*) PyMem_Malloc((Py_ssize_t) bufferSize);
if (!buffer)
return PyErr_NoMemory();
// read the LOB
Py_BEGIN_ALLOW_THREADS
status = dpiLob_readBytes(lob->handle, offset, amount, buffer,
&bufferSize);
Py_END_ALLOW_THREADS
if (status < 0) {
PyMem_Free(buffer);
return cxoError_raiseAndReturnNull();
}
// return the result
if (lob->dbType == cxoDbTypeNclob) {
result = PyUnicode_Decode(buffer, (Py_ssize_t) bufferSize,
lob->connection->encodingInfo.nencoding, NULL);
} else if (lob->dbType == cxoDbTypeClob) {
result = PyUnicode_Decode(buffer, (Py_ssize_t) bufferSize,
lob->connection->encodingInfo.encoding, NULL);
} else {
result = PyBytes_FromStringAndSize(buffer, (Py_ssize_t) bufferSize);
}
PyMem_Free(buffer);
return result;
}
//-----------------------------------------------------------------------------
// cxoLob_internalWrite()
// Write the data in the Python object to the LOB.
//-----------------------------------------------------------------------------
static int cxoLob_internalWrite(cxoLob *lob, PyObject *dataObj,
uint64_t offset)
{
const char *encoding;
cxoBuffer buffer;
int status;
if (lob->dbType == cxoDbTypeNclob)
encoding = lob->connection->encodingInfo.nencoding;
else encoding = lob->connection->encodingInfo.encoding;
if (cxoBuffer_fromObject(&buffer, dataObj, encoding) < 0)
return -1;
Py_BEGIN_ALLOW_THREADS
status = dpiLob_writeBytes(lob->handle, offset,
(char*) buffer.ptr, buffer.size);
Py_END_ALLOW_THREADS
cxoBuffer_clear(&buffer);
if (status < 0)
return cxoError_raiseAndReturnInt();
return 0;
}
//-----------------------------------------------------------------------------
// cxoLob_size()
// Return the size of the data in the LOB.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_size(cxoLob *lob, PyObject *args)
{
uint64_t length;
if (dpiLob_getSize(lob->handle, &length) < 0)
return cxoError_raiseAndReturnNull();
return PyLong_FromUnsignedLongLong(length);
}
//-----------------------------------------------------------------------------
// cxoLob_open()
// Open the LOB to speed further accesses.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_open(cxoLob *lob, PyObject *args)
{
int status;
Py_BEGIN_ALLOW_THREADS
status = dpiLob_openResource(lob->handle);
Py_END_ALLOW_THREADS
if (status < 0)
return cxoError_raiseAndReturnNull();
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// cxoLob_close()
// Close the LOB.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_close(cxoLob *lob, PyObject *args)
{
int status;
Py_BEGIN_ALLOW_THREADS
status = dpiLob_closeResource(lob->handle);
Py_END_ALLOW_THREADS
if (status < 0)
return cxoError_raiseAndReturnNull();
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// cxoLob_read()
// Return a portion (or all) of the data in the LOB.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_read(cxoLob *lob, PyObject *args, PyObject *keywordArgs)
{
static char *keywordList[] = { "offset", "amount", NULL };
unsigned PY_LONG_LONG offset, amount;
// offset and amount are expected, both optional
offset = 1;
amount = (unsigned PY_LONG_LONG)(-1);
if (!PyArg_ParseTupleAndKeywords(args, keywordArgs, "|KK", keywordList,
&offset, &amount))
return NULL;
return cxoLob_internalRead(lob, (uint64_t) offset, (uint64_t) amount);
}
//-----------------------------------------------------------------------------
// cxoLob_str()
// Return all of the data in the LOB.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_str(cxoLob *lob)
{
return cxoLob_internalRead(lob, 1, (uint64_t)(-1));
}
//-----------------------------------------------------------------------------
// cxoLob_write()
// Write a value to the LOB.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_write(cxoLob *lob, PyObject *args,
PyObject *keywordArgs)
{
static char *keywordList[] = { "data", "offset", NULL };
unsigned PY_LONG_LONG offset;
PyObject *dataObj;
offset = 1;
if (!PyArg_ParseTupleAndKeywords(args, keywordArgs, "O|K", keywordList,
&dataObj, &offset))
return NULL;
if (cxoLob_internalWrite(lob, dataObj, (uint64_t) offset) < 0)
return NULL;
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// cxoLob_trim()
// Trim the LOB to the specified length.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_trim(cxoLob *lob, PyObject *args,
PyObject *keywordArgs)
{
static char *keywordList[] = { "new_size", "newSize", NULL };
unsigned PY_LONG_LONG newSize, newSizeDeprecated;
int status;
newSize = newSizeDeprecated = 0;
if (!PyArg_ParseTupleAndKeywords(args, keywordArgs, "|KK", keywordList,
&newSize, &newSizeDeprecated))
return NULL;
if (newSizeDeprecated > 0) {
if (newSize > 0) {
cxoError_raiseFromString(cxoProgrammingErrorException,
"new_size and newSize cannot both be specified");
return NULL;
}
newSize = newSizeDeprecated;
}
Py_BEGIN_ALLOW_THREADS
status = dpiLob_trim(lob->handle, (uint64_t) newSize);
Py_END_ALLOW_THREADS
if (status < 0)
return cxoError_raiseAndReturnNull();
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// cxoLob_reduce()
// Method provided for pickling/unpickling of LOBs.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_reduce(cxoLob *lob)
{
PyObject *result, *value;
value = cxoLob_str(lob);
if (!value)
return NULL;
result = Py_BuildValue("(O(O))", Py_TYPE(value), value);
Py_DECREF(value);
return result;
}
//-----------------------------------------------------------------------------
// cxoLob_getChunkSize()
// Return the chunk size that should be used when reading/writing the LOB in
// chunks.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_getChunkSize(cxoLob *lob, PyObject *args)
{
uint32_t size;
if (dpiLob_getChunkSize(lob->handle, &size) < 0)
return cxoError_raiseAndReturnNull();
return PyLong_FromLong(size);
}
//-----------------------------------------------------------------------------
// cxoLob_isOpen()
// Return a boolean indicating if the lob is open or not.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_isOpen(cxoLob *lob, PyObject *args)
{
int isOpen, status;
Py_BEGIN_ALLOW_THREADS
status = dpiLob_getIsResourceOpen(lob->handle, &isOpen);
Py_END_ALLOW_THREADS
if (status < 0)
return cxoError_raiseAndReturnNull();
return PyBool_FromLong(isOpen);
}
//-----------------------------------------------------------------------------
// cxoLob_getFileName()
// Return the directory alias and file name for the BFILE lob.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_getFileName(cxoLob *lob, PyObject *args)
{
uint32_t directoryAliasLength, fileNameLength;
const char *directoryAlias, *fileName;
PyObject *result, *temp;
int status;
// get the information from the LOB
Py_BEGIN_ALLOW_THREADS
status = dpiLob_getDirectoryAndFileName(lob->handle, &directoryAlias,
&directoryAliasLength, &fileName, &fileNameLength);
Py_END_ALLOW_THREADS
if (status < 0)
return cxoError_raiseAndReturnNull();
// create the two-tuple for returning
result = PyTuple_New(2);
if (!result)
return NULL;
temp = PyUnicode_Decode(directoryAlias, directoryAliasLength,
lob->connection->encodingInfo.encoding, NULL);
if (!temp) {
Py_DECREF(result);
return NULL;
}
PyTuple_SET_ITEM(result, 0, temp);
temp = PyUnicode_Decode(fileName, fileNameLength,
lob->connection->encodingInfo.encoding, NULL);
if (!temp) {
Py_DECREF(result);
return NULL;
}
PyTuple_SET_ITEM(result, 1, temp);
return result;
}
//-----------------------------------------------------------------------------
// cxoLob_setFileName()
// Set the directory alias and file name for the BFILE lob.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_setFileName(cxoLob *lob, PyObject *args)
{
cxoBuffer directoryAliasBuffer, fileNameBuffer;
PyObject *directoryAliasObj, *fileNameObj;
int status;
// get the directory alias and file name
if (!PyArg_ParseTuple(args, "OO", &directoryAliasObj, &fileNameObj))
return NULL;
if (cxoBuffer_fromObject(&directoryAliasBuffer, directoryAliasObj,
lob->connection->encodingInfo.encoding) < 0)
return NULL;
if (cxoBuffer_fromObject(&fileNameBuffer, fileNameObj,
lob->connection->encodingInfo.encoding) < 0) {
cxoBuffer_clear(&directoryAliasBuffer);
return NULL;
}
// perform the work
Py_BEGIN_ALLOW_THREADS
status = dpiLob_setDirectoryAndFileName(lob->handle,
(char*) directoryAliasBuffer.ptr, directoryAliasBuffer.size,
(char*) fileNameBuffer.ptr, fileNameBuffer.size);
Py_END_ALLOW_THREADS
cxoBuffer_clear(&directoryAliasBuffer);
cxoBuffer_clear(&fileNameBuffer);
if (status < 0)
return cxoError_raiseAndReturnNull();
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// cxoLob_fileExists()
// Return a boolean indicating if the BFIILE lob exists.
//-----------------------------------------------------------------------------
static PyObject *cxoLob_fileExists(cxoLob *lob, PyObject *args)
{
int status, exists;
Py_BEGIN_ALLOW_THREADS
status = dpiLob_getFileExists(lob->handle, &exists);
Py_END_ALLOW_THREADS
if (status < 0)
return cxoError_raiseAndReturnNull();
if (exists)
Py_RETURN_TRUE;
Py_RETURN_FALSE;
}
//-----------------------------------------------------------------------------
// declaration of methods
//-----------------------------------------------------------------------------
static PyMethodDef cxoLobMethods[] = {
{ "size", (PyCFunction) cxoLob_size, METH_NOARGS },
{ "open", (PyCFunction) cxoLob_open, METH_NOARGS },
{ "close", (PyCFunction) cxoLob_close, METH_NOARGS },
{ "read", (PyCFunction) cxoLob_read, METH_VARARGS | METH_KEYWORDS },
{ "write", (PyCFunction) cxoLob_write, METH_VARARGS | METH_KEYWORDS },
{ "trim", (PyCFunction) cxoLob_trim, METH_VARARGS | METH_KEYWORDS },
{ "getchunksize", (PyCFunction) cxoLob_getChunkSize, METH_NOARGS },
{ "isopen", (PyCFunction) cxoLob_isOpen, METH_NOARGS },
{ "getfilename", (PyCFunction) cxoLob_getFileName, METH_NOARGS },
{ "setfilename", (PyCFunction) cxoLob_setFileName, METH_VARARGS },
{ "fileexists", (PyCFunction) cxoLob_fileExists, METH_NOARGS },
{ "__reduce__", (PyCFunction) cxoLob_reduce, METH_NOARGS },
{ NULL, NULL }
};
//-----------------------------------------------------------------------------
// declaration of members
//-----------------------------------------------------------------------------
static PyMemberDef cxoMembers[] = {
{ "type", T_OBJECT, offsetof(cxoLob, dbType), READONLY },
{ NULL }
};
//-----------------------------------------------------------------------------
// Python type declaration
//-----------------------------------------------------------------------------
PyTypeObject cxoPyTypeLob = {
PyVarObject_HEAD_INIT(NULL, 0)
.tp_name = "cx_Oracle.LOB",
.tp_basicsize = sizeof(cxoLob),
.tp_dealloc = (destructor) cxoLob_free,
.tp_str = (reprfunc) cxoLob_str,
.tp_flags = Py_TPFLAGS_DEFAULT,
.tp_methods = cxoLobMethods,
.tp_members = cxoMembers
};
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