rtyler
/
py-yajl
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
py-yajl/encoder.c

420 lines
13 KiB
C
Raw Permalink Blame History

/*
* Copyright 2010, R. Tyler Ballance <tyler@monkeypox.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. Neither the name of R. Tyler Ballance nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <Python.h>
#include <yajl/yajl_parse.h>
#include <yajl/yajl_gen.h>
#include <yajl_alloc.h>
#include <yajl_buf.h>
#include "py_yajl.h"
static const char *hexdigit = "0123456789abcdef";
/* Located in yajl_hacks.c */
extern yajl_gen_status yajl_gen_raw_string(yajl_gen g,
const unsigned char * str, unsigned int len);
static yajl_gen_status ProcessObject(_YajlEncoder *self, PyObject *object)
{
yajl_gen handle = (yajl_gen)(self->_generator);
yajl_gen_status status = yajl_gen_in_error_state;
PyObject *iterator, *item;
if (object == Py_None) {
return yajl_gen_null(handle);
}
if (object == Py_True) {
return yajl_gen_bool(handle, 1);
}
if (object == Py_False) {
return yajl_gen_bool(handle, 0);
}
if (PyUnicode_Check(object)) {
Py_ssize_t length = PyUnicode_GET_SIZE(object);
Py_UNICODE *raw_unicode = PyUnicode_AS_UNICODE(object);
/*
* Create a buffer with enough space for code-points, preceeding and
* following quotes and a null termination character
*/
char *buffer = (char *)(malloc(sizeof(char) * (1 + length * 6)));
unsigned int offset = 0;
while (length-- > 0) {
Py_UNICODE ch = *raw_unicode++;
/* Escape escape characters */
switch (ch) {
case '\t':
buffer[offset++] = '\\';
buffer[offset++] = 't';
continue;
break;
case '\n':
buffer[offset++] = '\\';
buffer[offset++] = 'n';
continue;
break;
case '\r':
buffer[offset++] = '\\';
buffer[offset++] = 'r';
continue;
break;
case '\f':
buffer[offset++] = '\\';
buffer[offset++] = 'f';
continue;
break;
case '\b':
buffer[offset++] = '\\';
buffer[offset++] = 'b';
continue;
break;
case '\\':
buffer[offset++] = '\\';
buffer[offset++] = '\\';
continue;
break;
case '\"':
buffer[offset++] = '\\';
buffer[offset++] = '\"';
continue;
break;
default:
break;
}
/* Map 16-bit characters to '\uxxxx' */
if (ch >= 256) {
buffer[offset++] = '\\';
buffer[offset++] = 'u';
buffer[offset++] = hexdigit[(ch >> 12) & 0x000F];
buffer[offset++] = hexdigit[(ch >> 8) & 0x000F];
buffer[offset++] = hexdigit[(ch >> 4) & 0x000F];
buffer[offset++] = hexdigit[ch & 0x000F];
continue;
}
/* Map non-printable US ASCII to '\u00hh' */
if ( (ch < 0x20) || (ch >= 0x7F) ) {
buffer[offset++] = '\\';
buffer[offset++] = 'u';
buffer[offset++] = '0';
buffer[offset++] = '0';
buffer[offset++] = hexdigit[(ch >> 4) & 0x0F];
buffer[offset++] = hexdigit[ch & 0x0F];
continue;
}
/* Handle proper ascii chars */
if ( (ch >= 0x20) && (ch < 0x7F) ) {
buffer[offset++] = (char)(ch);
continue;
}
}
buffer[offset] = '\0';
status = yajl_gen_raw_string(handle, (const unsigned char *)(buffer), (unsigned int)(offset));
free(buffer);
return status;
}
#ifdef IS_PYTHON3
if (PyBytes_Check(object)) {
#else
if (PyString_Check(object)) {
#endif
const unsigned char *buffer = NULL;
Py_ssize_t length;
#ifdef IS_PYTHON3
PyBytes_AsStringAndSize(object, (char **)&buffer, &length);
#else
PyString_AsStringAndSize(object, (char **)&buffer, &length);
#endif
return yajl_gen_string(handle, buffer, (unsigned int)(length));
}
#ifndef IS_PYTHON3
if (PyInt_Check(object)) {
long number = PyInt_AsLong(object);
if ( (number == -1) && (PyErr_Occurred()) ) {
return yajl_gen_in_error_state;
}
return yajl_gen_integer(handle, number);
}
#endif
if (PyLong_Check(object)) {
long long number = PyLong_AsLongLong(object);
char *buffer = NULL;
if ( (number == -1) && (PyErr_Occurred()) ) {
return yajl_gen_in_error_state;;
}
/*
* Nifty trick for getting the buffer length of a long long, going
* to convert this long long into a buffer to be handled by
* yajl_gen_number()
*/
unsigned int length = (unsigned int)(snprintf(NULL, 0, "%lld", number)) + 1;
buffer = (char *)(malloc(length));
snprintf(buffer, length, "%lld", number);
return yajl_gen_number(handle, buffer, length - 1);
}
if (PyFloat_Check(object)) {
return yajl_gen_double(handle, PyFloat_AsDouble(object));
}
if (PyList_Check(object)||PyGen_Check(object)||PyTuple_Check(object)) {
/*
* Recurse and handle the list
*/
iterator = PyObject_GetIter(object);
if (iterator == NULL)
goto exit;
status = yajl_gen_array_open(handle);
if (status == yajl_max_depth_exceeded) {
Py_XDECREF(iterator);
goto exit;
}
while ((item = PyIter_Next(iterator))) {
status = ProcessObject(self, item);
Py_XDECREF(item);
}
Py_XDECREF(iterator);
yajl_gen_status close_status = yajl_gen_array_close(handle);
if (status == yajl_gen_in_error_state)
return status;
return close_status;
}
if (PyDict_Check(object)) {
PyObject *key, *value;
Py_ssize_t position = 0;
status = yajl_gen_map_open(handle);
if (status == yajl_max_depth_exceeded) goto exit;
while (PyDict_Next(object, &position, &key, &value)) {
PyObject *newKey = key;
if ( (PyFloat_Check(key)) ||
#ifndef IS_PYTHON3
(PyInt_Check(key)) ||
#endif
(PyLong_Check(key)) ) {
/*
* Performing the conversion separately for Python 2
* and Python 3 to ensure we consistently generate
* unicode strings in both versions
*/
#ifdef IS_PYTHON3
newKey = PyObject_Str(key);
#else
newKey = PyObject_Unicode(key);
#endif
}
status = ProcessObject(self, newKey);
if (key != newKey) {
Py_XDECREF(newKey);
}
if (status == yajl_gen_in_error_state) return status;
if (status == yajl_max_depth_exceeded) goto exit;
status = ProcessObject(self, value);
if (status == yajl_gen_in_error_state) return status;
if (status == yajl_max_depth_exceeded) goto exit;
}
return yajl_gen_map_close(handle);
}
else {
object = PyObject_CallMethod((PyObject *)self, "default", "O", object);
if (object==NULL)
goto exit;
status = ProcessObject(self, object);
return status;
}
exit:
return yajl_gen_in_error_state;
}
yajl_alloc_funcs *y_allocs = NULL;
/* a structure used to pass context to our printer function */
struct StringAndUsedCount
{
PyObject * str;
size_t used;
};
static void py_yajl_printer(void * ctx,
const char * str,
unsigned int len)
{
struct StringAndUsedCount * sauc = (struct StringAndUsedCount *) ctx;
size_t newsize;
if (!sauc || !sauc->str) return;
/* resize our string if necc */
newsize = Py_SIZE(sauc->str);
while (sauc->used + len > newsize) newsize *= 2;
if (newsize != Py_SIZE(sauc->str)) {
#ifdef IS_PYTHON3
_PyBytes_Resize(&(sauc->str), newsize);
#else
_PyString_Resize(&(sauc->str), newsize);
#endif
if (!sauc->str)
return;
}
/* and append data if available */
if (len && str) {
#ifdef IS_PYTHON3
memcpy((void *)(((PyBytesObject *)sauc->str)->ob_sval + sauc->used), str, len);
#else
memcpy((void *) (((PyStringObject *) sauc->str)->ob_sval + sauc->used), str, len);
#endif
sauc->used += len;
}
}
/* Efficiently allocate a python string of a fixed size containing uninitialized memory */
static PyObject * lowLevelStringAlloc(Py_ssize_t size)
{
#ifdef IS_PYTHON3
PyBytesObject * op = (PyBytesObject *)PyObject_MALLOC(sizeof(PyBytesObject) + size);
if (op) {
PyObject_INIT_VAR(op, &PyBytes_Type, size);
}
#else
PyStringObject * op = (PyStringObject *)PyObject_MALLOC(sizeof(PyStringObject) + size);
if (op) {
PyObject_INIT_VAR(op, &PyString_Type, size);
op->ob_shash = -1;
op->ob_sstate = SSTATE_NOT_INTERNED;
}
#endif
return (PyObject *) op;
}
PyObject *_internal_encode(_YajlEncoder *self, PyObject *obj, yajl_gen_config genconfig)
{
yajl_gen generator = NULL;
yajl_gen_status status;
struct StringAndUsedCount sauc;
#ifdef IS_PYTHON3
PyObject *result = NULL;
#endif
/* initialize context for our printer function which
* performs low level string appending, using the python
* string implementation as a chunked growth buffer */
sauc.used = 0;
sauc.str = lowLevelStringAlloc(PY_YAJL_CHUNK_SZ);
generator = yajl_gen_alloc2(py_yajl_printer, &genconfig, NULL, (void *) &sauc);
self->_generator = generator;
status = ProcessObject(self, obj);
yajl_gen_free(generator);
self->_generator = NULL;
/* if resize failed inside our printer function we'll have a null sauc.str */
if (!sauc.str) {
PyErr_SetObject(PyExc_ValueError, PyUnicode_FromString("Allocation failure"));
return NULL;
}
if ( (status == yajl_gen_in_error_state) ||
(status != yajl_gen_status_ok) ) {
/*
* If we have an exception underneath the covers, let's raise that
* instead
*/
if (!PyErr_Occurred()) {
PyErr_SetObject(PyExc_TypeError, PyUnicode_FromString("Object is not JSON serializable"));
}
Py_XDECREF(sauc.str);
return NULL;
}
#ifdef IS_PYTHON3
result = PyUnicode_DecodeUTF8(((PyBytesObject *)sauc.str)->ob_sval, sauc.used, "strict");
Py_XDECREF(sauc.str);
return result;
#else
/* truncate to used size, and resize will handle the null plugging */
_PyString_Resize(&sauc.str, sauc.used);
return sauc.str;
#endif
}
PyObject *py_yajlencoder_default(PYARGS)
{
PyObject *value;
if (!PyArg_ParseTuple(args, "O", &value))
return NULL;
PyErr_SetObject(PyExc_TypeError, PyUnicode_FromString("Not serializable to JSON"));
return NULL;
}
PyObject *py_yajlencoder_encode(PYARGS)
{
_YajlEncoder *encoder = (_YajlEncoder *)(self);
yajl_gen_config config = {0, NULL};
PyObject *value;
if (!PyArg_ParseTuple(args, "O", &value))
return NULL;
return _internal_encode(encoder, value, config);
}
int yajlencoder_init(PYARGS)
{
_YajlEncoder *me = (_YajlEncoder *)(self);
if (!me)
return 1;
return 0;
}
void yajlencoder_dealloc(_YajlEncoder *self)
{
#ifdef IS_PYTHON3
Py_TYPE(self)->tp_free((PyObject*)self);
#else
self->ob_type->tp_free((PyObject*)self);
#endif
}
Reference in New Issue View Git Blame Copy Permalink