+++ /dev/null
-/* typecast_binary.c - binary typecasting functions to python types
- *
- * Copyright (C) 2001-2003 Federico Di Gregorio <fog@debian.org>
- *
- * This file is part of the psycopg module.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2,
- * or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#include "typecast_binary.h"
-
-#include <libpq-fe.h>
-#include <stdlib.h>
-
-
-/* Python object holding a memory chunk. The memory is deallocated when
- the object is destroyed. This type is used to let users directly access
- memory chunks holding unescaped binary data through the buffer interface.
- */
-
-static void
-chunk_dealloc(chunkObject *self)
-{
- Dprintf("chunk_dealloc: deallocating memory at %p, size %d",
- self->base, self->len);
- free(self->base);
- self->ob_type->tp_free((PyObject *) self);
-}
-
-static PyObject *
-chunk_repr(chunkObject *self)
-{
- return PyString_FromFormat("<memory chunk at %p size %d>",
- self->base, self->len);
-}
-
-static int
-chunk_getreadbuffer(chunkObject *self, int segment, void **ptr)
-{
- if (segment != 0)
- {
- PyErr_SetString(PyExc_SystemError,
- "acessing non-existant buffer segment");
- return -1;
- }
- *ptr = self->base;
- return self->len;
-}
-
-static int
-chunk_getsegcount(chunkObject *self, int *lenp)
-{
- if (lenp != NULL)
- *lenp = self->len;
- return 1;
-}
-
-static PyBufferProcs chunk_as_buffer =
-{
- (getreadbufferproc) chunk_getreadbuffer,
- (getwritebufferproc) NULL,
- (getsegcountproc) chunk_getsegcount,
- (getcharbufferproc) NULL
-};
-
-#define chunk_doc "memory chunk"
-
-PyTypeObject chunkType = {
- PyObject_HEAD_INIT(NULL)
- 0, /* ob_size */
- "psycopg2._psycopg.chunk", /* tp_name */
- sizeof(chunkObject), /* tp_basicsize */
- 0, /* tp_itemsize */
- (destructor) chunk_dealloc, /* tp_dealloc*/
- 0, /* tp_print */
- 0, /* tp_getattr */
- 0, /* tp_setattr */
- 0, /* tp_compare */
- (reprfunc) chunk_repr, /* 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 */
- &chunk_as_buffer, /* tp_as_buffer */
- Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, /* tp_flags */
- chunk_doc /* tp_doc */
-};
-
-/* the function typecast_BINARY_cast_unescape is used when libpq does not
- provide PQunescapeBytea: it convert all the \xxx octal sequences to the
- proper byte value */
-
-#ifdef PSYCOPG_OWN_QUOTING
-static unsigned char *
-typecast_BINARY_cast_unescape(unsigned char *str, size_t *to_length)
-{
- char *dstptr, *dststr;
- int len, i;
-
- len = strlen(str);
- dststr = (char*)calloc(len, sizeof(char));
- dstptr = dststr;
-
- if (dststr == NULL) return NULL;
-
- Py_BEGIN_ALLOW_THREADS;
-
- for (i = 0; i < len; i++) {
- if (str[i] == '\\') {
- if ( ++i < len) {
- if (str[i] == '\\') {
- *dstptr = '\\';
- }
- else {
- *dstptr = 0;
- *dstptr |= (str[i++] & 7) << 6;
- *dstptr |= (str[i++] & 7) << 3;
- *dstptr |= (str[i] & 7);
- }
- }
- }
- else {
- *dstptr = str[i];
- }
- dstptr++;
- }
-
- Py_END_ALLOW_THREADS;
-
- *to_length = (size_t)(dstptr-dststr);
-
- return dststr;
-}
-
-#define PQunescapeBytea typecast_BINARY_cast_unescape
-#endif
-
-static PyObject *
-typecast_BINARY_cast(char *s, int l, PyObject *curs)
-{
- chunkObject *chunk;
- PyObject *res;
- char *str, *buffer = NULL;
- size_t len;
-
- if (s == NULL) {Py_INCREF(Py_None); return Py_None;}
-
- /* PQunescapeBytea absolutely wants a 0-terminated string and we don't
- want to copy the whole buffer, right? Wrong, but there isn't any other
- way <g> */
- if (s[l] != '\0') {
- if ((buffer = PyMem_Malloc(l+1)) == NULL)
- PyErr_NoMemory();
- strncpy(buffer, s, l);
- buffer[l] = '\0';
- s = buffer;
- }
- str = (char*)PQunescapeBytea((unsigned char*)s, &len);
- Dprintf("typecast_BINARY_cast: unescaped %d bytes", len);
- if (buffer) PyMem_Free(buffer);
-
- chunk = (chunkObject *) PyObject_New(chunkObject, &chunkType);
- if (chunk == NULL) return NULL;
-
- chunk->base = str;
- chunk->len = len;
- if ((res = PyBuffer_FromObject((PyObject *)chunk, 0, len)) == NULL)
- return NULL;
-
- /* PyBuffer_FromObject() created a new reference. Release our reference so
- that the memory can be freed once the buffer is garbage collected. */
- Py_DECREF(chunk);
-
- return res;
-}
git://git.onelab.eu / plcapi.git / blobdiff