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multibytecodec.c
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/*
* multibytecodec.c: Common Multibyte Codec Implementation
*
* Written by Hye-Shik Chang <[email protected]>
*/
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "structmember.h"
#include "multibytecodec.h"
typedef struct {
const Py_UNICODE *inbuf, *inbuf_top, *inbuf_end;
unsigned char *outbuf, *outbuf_end;
PyObject *excobj, *outobj;
} MultibyteEncodeBuffer;
typedef struct {
const unsigned char *inbuf, *inbuf_top, *inbuf_end;
Py_UNICODE *outbuf, *outbuf_end;
PyObject *excobj, *outobj;
} MultibyteDecodeBuffer;
PyDoc_STRVAR(MultibyteCodec_Encode__doc__,
"I.encode(unicode[, errors]) -> (string, length consumed)\n\
\n\
Return an encoded string version of `unicode'. errors may be given to\n\
set a different error handling scheme. Default is 'strict' meaning that\n\
encoding errors raise a UnicodeEncodeError. Other possible values are\n\
'ignore', 'replace' and 'xmlcharrefreplace' as well as any other name\n\
registered with codecs.register_error that can handle UnicodeEncodeErrors.");
PyDoc_STRVAR(MultibyteCodec_Decode__doc__,
"I.decode(string[, errors]) -> (unicodeobject, length consumed)\n\
\n\
Decodes `string' using I, an MultibyteCodec instance. errors may be given\n\
to set a different error handling scheme. Default is 'strict' meaning\n\
that encoding errors raise a UnicodeDecodeError. Other possible values\n\
are 'ignore' and 'replace' as well as any other name registered with\n\
codecs.register_error that is able to handle UnicodeDecodeErrors.");
static char *codeckwarglist[] = {"input", "errors", NULL};
static char *incnewkwarglist[] = {"errors", NULL};
static char *incrementalkwarglist[] = {"input", "final", NULL};
static char *streamkwarglist[] = {"stream", "errors", NULL};
static PyObject *multibytecodec_encode(MultibyteCodec *,
MultibyteCodec_State *, const Py_UNICODE **, Py_ssize_t,
PyObject *, int);
#define MBENC_RESET MBENC_MAX<<1 /* reset after an encoding session */
static PyObject *
make_tuple(PyObject *object, Py_ssize_t len)
{
PyObject *v, *w;
if (object == NULL)
return NULL;
v = PyTuple_New(2);
if (v == NULL) {
Py_DECREF(object);
return NULL;
}
PyTuple_SET_ITEM(v, 0, object);
w = PyInt_FromSsize_t(len);
if (w == NULL) {
Py_DECREF(v);
return NULL;
}
PyTuple_SET_ITEM(v, 1, w);
return v;
}
static PyObject *
internal_error_callback(const char *errors)
{
if (errors == NULL || strcmp(errors, "strict") == 0)
return ERROR_STRICT;
else if (strcmp(errors, "ignore") == 0)
return ERROR_IGNORE;
else if (strcmp(errors, "replace") == 0)
return ERROR_REPLACE;
else
return PyString_FromString(errors);
}
static PyObject *
call_error_callback(PyObject *errors, PyObject *exc)
{
PyObject *args, *cb, *r;
assert(PyString_Check(errors));
cb = PyCodec_LookupError(PyString_AS_STRING(errors));
if (cb == NULL)
return NULL;
args = PyTuple_New(1);
if (args == NULL) {
Py_DECREF(cb);
return NULL;
}
PyTuple_SET_ITEM(args, 0, exc);
Py_INCREF(exc);
r = PyObject_CallObject(cb, args);
Py_DECREF(args);
Py_DECREF(cb);
return r;
}
static PyObject *
codecctx_errors_get(MultibyteStatefulCodecContext *self)
{
const char *errors;
if (self->errors == ERROR_STRICT)
errors = "strict";
else if (self->errors == ERROR_IGNORE)
errors = "ignore";
else if (self->errors == ERROR_REPLACE)
errors = "replace";
else {
Py_INCREF(self->errors);
return self->errors;
}
return PyString_FromString(errors);
}
static int
codecctx_errors_set(MultibyteStatefulCodecContext *self, PyObject *value,
void *closure)
{
PyObject *cb;
if (!PyString_Check(value)) {
PyErr_SetString(PyExc_TypeError, "errors must be a string");
return -1;
}
cb = internal_error_callback(PyString_AS_STRING(value));
if (cb == NULL)
return -1;
ERROR_DECREF(self->errors);
self->errors = cb;
return 0;
}
/* This getset handlers list is used by all the stateful codec objects */
static PyGetSetDef codecctx_getsets[] = {
{"errors", (getter)codecctx_errors_get,
(setter)codecctx_errors_set,
PyDoc_STR("how to treat errors")},
{NULL,}
};
static int
expand_encodebuffer(MultibyteEncodeBuffer *buf, Py_ssize_t esize)
{
Py_ssize_t orgpos, orgsize, incsize;
orgpos = (Py_ssize_t)((char *)buf->outbuf -
PyString_AS_STRING(buf->outobj));
orgsize = PyString_GET_SIZE(buf->outobj);
incsize = (esize < (orgsize >> 1) ? (orgsize >> 1) | 1 : esize);
if (orgsize > PY_SSIZE_T_MAX - incsize)
return -1;
if (_PyString_Resize(&buf->outobj, orgsize + incsize) == -1)
return -1;
buf->outbuf = (unsigned char *)PyString_AS_STRING(buf->outobj) +orgpos;
buf->outbuf_end = (unsigned char *)PyString_AS_STRING(buf->outobj)
+ PyString_GET_SIZE(buf->outobj);
return 0;
}
#define REQUIRE_ENCODEBUFFER(buf, s) { \
if ((s) < 1 || (buf)->outbuf + (s) > (buf)->outbuf_end) \
if (expand_encodebuffer(buf, s) == -1) \
goto errorexit; \
}
static int
expand_decodebuffer(MultibyteDecodeBuffer *buf, Py_ssize_t esize)
{
Py_ssize_t orgpos, orgsize;
orgpos = (Py_ssize_t)(buf->outbuf - PyUnicode_AS_UNICODE(buf->outobj));
orgsize = PyUnicode_GET_SIZE(buf->outobj);
if (PyUnicode_Resize(&buf->outobj, orgsize + (
esize < (orgsize >> 1) ? (orgsize >> 1) | 1 : esize)) == -1)
return -1;
buf->outbuf = PyUnicode_AS_UNICODE(buf->outobj) + orgpos;
buf->outbuf_end = PyUnicode_AS_UNICODE(buf->outobj)
+ PyUnicode_GET_SIZE(buf->outobj);
return 0;
}
#define REQUIRE_DECODEBUFFER(buf, s) { \
if ((s) < 1 || (buf)->outbuf + (s) > (buf)->outbuf_end) \
if (expand_decodebuffer(buf, s) == -1) \
goto errorexit; \
}
/**
* MultibyteCodec object
*/
static int
multibytecodec_encerror(MultibyteCodec *codec,
MultibyteCodec_State *state,
MultibyteEncodeBuffer *buf,
PyObject *errors, Py_ssize_t e)
{
PyObject *retobj = NULL, *retstr = NULL, *tobj;
Py_ssize_t retstrsize, newpos;
Py_ssize_t esize, start, end;
const char *reason;
if (e > 0) {
reason = "illegal multibyte sequence";
esize = e;
}
else {
switch (e) {
case MBERR_TOOSMALL:
REQUIRE_ENCODEBUFFER(buf, -1);
return 0; /* retry it */
case MBERR_TOOFEW:
reason = "incomplete multibyte sequence";
esize = (Py_ssize_t)(buf->inbuf_end - buf->inbuf);
break;
case MBERR_INTERNAL:
PyErr_SetString(PyExc_RuntimeError,
"internal codec error");
return -1;
default:
PyErr_SetString(PyExc_RuntimeError,
"unknown runtime error");
return -1;
}
}
if (errors == ERROR_REPLACE) {
const Py_UNICODE replchar = '?', *inbuf = &replchar;
Py_ssize_t r;
for (;;) {
Py_ssize_t outleft;
outleft = (Py_ssize_t)(buf->outbuf_end - buf->outbuf);
r = codec->encode(state, codec->config, &inbuf, 1,
&buf->outbuf, outleft, 0);
if (r == MBERR_TOOSMALL) {
REQUIRE_ENCODEBUFFER(buf, -1);
continue;
}
else
break;
}
if (r != 0) {
REQUIRE_ENCODEBUFFER(buf, 1);
*buf->outbuf++ = '?';
}
}
if (errors == ERROR_IGNORE || errors == ERROR_REPLACE) {
buf->inbuf += esize;
return 0;
}
start = (Py_ssize_t)(buf->inbuf - buf->inbuf_top);
end = start + esize;
/* use cached exception object if available */
if (buf->excobj == NULL) {
buf->excobj = PyUnicodeEncodeError_Create(codec->encoding,
buf->inbuf_top,
buf->inbuf_end - buf->inbuf_top,
start, end, reason);
if (buf->excobj == NULL)
goto errorexit;
}
else
if (PyUnicodeEncodeError_SetStart(buf->excobj, start) != 0 ||
PyUnicodeEncodeError_SetEnd(buf->excobj, end) != 0 ||
PyUnicodeEncodeError_SetReason(buf->excobj, reason) != 0)
goto errorexit;
if (errors == ERROR_STRICT) {
PyCodec_StrictErrors(buf->excobj);
goto errorexit;
}
retobj = call_error_callback(errors, buf->excobj);
if (retobj == NULL)
goto errorexit;
if (!PyTuple_Check(retobj) || PyTuple_GET_SIZE(retobj) != 2 ||
!PyUnicode_Check((tobj = PyTuple_GET_ITEM(retobj, 0))) ||
!(PyInt_Check(PyTuple_GET_ITEM(retobj, 1)) ||
PyLong_Check(PyTuple_GET_ITEM(retobj, 1)))) {
PyErr_SetString(PyExc_TypeError,
"encoding error handler must return "
"(unicode, int) tuple");
goto errorexit;
}
{
const Py_UNICODE *uraw = PyUnicode_AS_UNICODE(tobj);
retstr = multibytecodec_encode(codec, state, &uraw,
PyUnicode_GET_SIZE(tobj), ERROR_STRICT,
MBENC_FLUSH);
if (retstr == NULL)
goto errorexit;
}
retstrsize = PyString_GET_SIZE(retstr);
REQUIRE_ENCODEBUFFER(buf, retstrsize);
memcpy(buf->outbuf, PyString_AS_STRING(retstr), retstrsize);
buf->outbuf += retstrsize;
newpos = PyInt_AsSsize_t(PyTuple_GET_ITEM(retobj, 1));
if (newpos < 0 && !PyErr_Occurred())
newpos += (Py_ssize_t)(buf->inbuf_end - buf->inbuf_top);
if (newpos < 0 || buf->inbuf_top + newpos > buf->inbuf_end) {
PyErr_Clear();
PyErr_Format(PyExc_IndexError,
"position %zd from error handler out of bounds",
newpos);
goto errorexit;
}
buf->inbuf = buf->inbuf_top + newpos;
Py_DECREF(retobj);
Py_DECREF(retstr);
return 0;
errorexit:
Py_XDECREF(retobj);
Py_XDECREF(retstr);
return -1;
}
static int
multibytecodec_decerror(MultibyteCodec *codec,
MultibyteCodec_State *state,
MultibyteDecodeBuffer *buf,
PyObject *errors, Py_ssize_t e)
{
PyObject *retobj = NULL, *retuni = NULL;
Py_ssize_t retunisize, newpos;
const char *reason;
Py_ssize_t esize, start, end;
if (e > 0) {
reason = "illegal multibyte sequence";
esize = e;
}
else {
switch (e) {
case MBERR_TOOSMALL:
REQUIRE_DECODEBUFFER(buf, -1);
return 0; /* retry it */
case MBERR_TOOFEW:
reason = "incomplete multibyte sequence";
esize = (Py_ssize_t)(buf->inbuf_end - buf->inbuf);
break;
case MBERR_INTERNAL:
PyErr_SetString(PyExc_RuntimeError,
"internal codec error");
return -1;
default:
PyErr_SetString(PyExc_RuntimeError,
"unknown runtime error");
return -1;
}
}
if (errors == ERROR_REPLACE) {
REQUIRE_DECODEBUFFER(buf, 1);
*buf->outbuf++ = Py_UNICODE_REPLACEMENT_CHARACTER;
}
if (errors == ERROR_IGNORE || errors == ERROR_REPLACE) {
buf->inbuf += esize;
return 0;
}
start = (Py_ssize_t)(buf->inbuf - buf->inbuf_top);
end = start + esize;
/* use cached exception object if available */
if (buf->excobj == NULL) {
buf->excobj = PyUnicodeDecodeError_Create(codec->encoding,
(const char *)buf->inbuf_top,
(Py_ssize_t)(buf->inbuf_end - buf->inbuf_top),
start, end, reason);
if (buf->excobj == NULL)
goto errorexit;
}
else
if (PyUnicodeDecodeError_SetStart(buf->excobj, start) ||
PyUnicodeDecodeError_SetEnd(buf->excobj, end) ||
PyUnicodeDecodeError_SetReason(buf->excobj, reason))
goto errorexit;
if (errors == ERROR_STRICT) {
PyCodec_StrictErrors(buf->excobj);
goto errorexit;
}
retobj = call_error_callback(errors, buf->excobj);
if (retobj == NULL)
goto errorexit;
if (!PyTuple_Check(retobj) || PyTuple_GET_SIZE(retobj) != 2 ||
!PyUnicode_Check((retuni = PyTuple_GET_ITEM(retobj, 0))) ||
!(PyInt_Check(PyTuple_GET_ITEM(retobj, 1)) ||
PyLong_Check(PyTuple_GET_ITEM(retobj, 1)))) {
PyErr_SetString(PyExc_TypeError,
"decoding error handler must return "
"(unicode, int) tuple");
goto errorexit;
}
retunisize = PyUnicode_GET_SIZE(retuni);
if (retunisize > 0) {
REQUIRE_DECODEBUFFER(buf, retunisize);
memcpy((char *)buf->outbuf, PyUnicode_AS_DATA(retuni),
retunisize * Py_UNICODE_SIZE);
buf->outbuf += retunisize;
}
newpos = PyInt_AsSsize_t(PyTuple_GET_ITEM(retobj, 1));
if (newpos < 0 && !PyErr_Occurred())
newpos += (Py_ssize_t)(buf->inbuf_end - buf->inbuf_top);
if (newpos < 0 || buf->inbuf_top + newpos > buf->inbuf_end) {
PyErr_Clear();
PyErr_Format(PyExc_IndexError,
"position %zd from error handler out of bounds",
newpos);
goto errorexit;
}
buf->inbuf = buf->inbuf_top + newpos;
Py_DECREF(retobj);
return 0;
errorexit:
Py_XDECREF(retobj);
return -1;
}
static PyObject *
multibytecodec_encode(MultibyteCodec *codec,
MultibyteCodec_State *state,
const Py_UNICODE **data, Py_ssize_t datalen,
PyObject *errors, int flags)
{
MultibyteEncodeBuffer buf;
Py_ssize_t finalsize, r = 0;
if (datalen == 0)
return PyString_FromString("");
buf.excobj = NULL;
buf.inbuf = buf.inbuf_top = *data;
buf.inbuf_end = buf.inbuf_top + datalen;
if (datalen > (PY_SSIZE_T_MAX - 16) / 2) {
PyErr_NoMemory();
goto errorexit;
}
buf.outobj = PyString_FromStringAndSize(NULL, datalen * 2 + 16);
if (buf.outobj == NULL)
goto errorexit;
buf.outbuf = (unsigned char *)PyString_AS_STRING(buf.outobj);
buf.outbuf_end = buf.outbuf + PyString_GET_SIZE(buf.outobj);
while (buf.inbuf < buf.inbuf_end) {
Py_ssize_t inleft, outleft;
/* we don't reuse inleft and outleft here.
* error callbacks can relocate the cursor anywhere on buffer*/
inleft = (Py_ssize_t)(buf.inbuf_end - buf.inbuf);
outleft = (Py_ssize_t)(buf.outbuf_end - buf.outbuf);
r = codec->encode(state, codec->config, &buf.inbuf, inleft,
&buf.outbuf, outleft, flags);
*data = buf.inbuf;
if ((r == 0) || (r == MBERR_TOOFEW && !(flags & MBENC_FLUSH)))
break;
else if (multibytecodec_encerror(codec, state, &buf, errors,r))
goto errorexit;
else if (r == MBERR_TOOFEW)
break;
}
if (codec->encreset != NULL)
for (;;) {
Py_ssize_t outleft;
outleft = (Py_ssize_t)(buf.outbuf_end - buf.outbuf);
r = codec->encreset(state, codec->config, &buf.outbuf,
outleft);
if (r == 0)
break;
else if (multibytecodec_encerror(codec, state,
&buf, errors, r))
goto errorexit;
}
finalsize = (Py_ssize_t)((char *)buf.outbuf -
PyString_AS_STRING(buf.outobj));
if (finalsize != PyString_GET_SIZE(buf.outobj))
if (_PyString_Resize(&buf.outobj, finalsize) == -1)
goto errorexit;
Py_XDECREF(buf.excobj);
return buf.outobj;
errorexit:
Py_XDECREF(buf.excobj);
Py_XDECREF(buf.outobj);
return NULL;
}
static PyObject *
MultibyteCodec_Encode(MultibyteCodecObject *self,
PyObject *args, PyObject *kwargs)
{
MultibyteCodec_State state;
Py_UNICODE *data;
PyObject *errorcb, *r, *arg, *ucvt;
const char *errors = NULL;
Py_ssize_t datalen;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|z:encode",
codeckwarglist, &arg, &errors))
return NULL;
if (PyUnicode_Check(arg))
ucvt = NULL;
else {
arg = ucvt = PyObject_Unicode(arg);
if (arg == NULL)
return NULL;
else if (!PyUnicode_Check(arg)) {
PyErr_SetString(PyExc_TypeError,
"couldn't convert the object to unicode.");
Py_DECREF(ucvt);
return NULL;
}
}
data = PyUnicode_AS_UNICODE(arg);
datalen = PyUnicode_GET_SIZE(arg);
errorcb = internal_error_callback(errors);
if (errorcb == NULL) {
Py_XDECREF(ucvt);
return NULL;
}
if (self->codec->encinit != NULL &&
self->codec->encinit(&state, self->codec->config) != 0)
goto errorexit;
r = multibytecodec_encode(self->codec, &state,
(const Py_UNICODE **)&data, datalen, errorcb,
MBENC_FLUSH | MBENC_RESET);
if (r == NULL)
goto errorexit;
ERROR_DECREF(errorcb);
Py_XDECREF(ucvt);
return make_tuple(r, datalen);
errorexit:
ERROR_DECREF(errorcb);
Py_XDECREF(ucvt);
return NULL;
}
static PyObject *
MultibyteCodec_Decode(MultibyteCodecObject *self,
PyObject *args, PyObject *kwargs)
{
MultibyteCodec_State state;
MultibyteDecodeBuffer buf;
PyObject *errorcb;
Py_buffer pdata;
const char *data, *errors = NULL;
Py_ssize_t datalen, finalsize;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s*|z:decode",
codeckwarglist, &pdata, &errors))
return NULL;
data = pdata.buf;
datalen = pdata.len;
errorcb = internal_error_callback(errors);
if (errorcb == NULL) {
PyBuffer_Release(&pdata);
return NULL;
}
if (datalen == 0) {
PyBuffer_Release(&pdata);
ERROR_DECREF(errorcb);
return make_tuple(PyUnicode_FromUnicode(NULL, 0), 0);
}
buf.excobj = NULL;
buf.inbuf = buf.inbuf_top = (unsigned char *)data;
buf.inbuf_end = buf.inbuf_top + datalen;
buf.outobj = PyUnicode_FromUnicode(NULL, datalen);
if (buf.outobj == NULL)
goto errorexit;
buf.outbuf = PyUnicode_AS_UNICODE(buf.outobj);
buf.outbuf_end = buf.outbuf + PyUnicode_GET_SIZE(buf.outobj);
if (self->codec->decinit != NULL &&
self->codec->decinit(&state, self->codec->config) != 0)
goto errorexit;
while (buf.inbuf < buf.inbuf_end) {
Py_ssize_t inleft, outleft, r;
inleft = (Py_ssize_t)(buf.inbuf_end - buf.inbuf);
outleft = (Py_ssize_t)(buf.outbuf_end - buf.outbuf);
r = self->codec->decode(&state, self->codec->config,
&buf.inbuf, inleft, &buf.outbuf, outleft);
if (r == 0)
break;
else if (multibytecodec_decerror(self->codec, &state,
&buf, errorcb, r))
goto errorexit;
}
finalsize = (Py_ssize_t)(buf.outbuf -
PyUnicode_AS_UNICODE(buf.outobj));
if (finalsize != PyUnicode_GET_SIZE(buf.outobj))
if (PyUnicode_Resize(&buf.outobj, finalsize) == -1)
goto errorexit;
PyBuffer_Release(&pdata);
Py_XDECREF(buf.excobj);
ERROR_DECREF(errorcb);
return make_tuple(buf.outobj, datalen);
errorexit:
PyBuffer_Release(&pdata);
ERROR_DECREF(errorcb);
Py_XDECREF(buf.excobj);
Py_XDECREF(buf.outobj);
return NULL;
}
static struct PyMethodDef multibytecodec_methods[] = {
{"encode", (PyCFunction)MultibyteCodec_Encode,
METH_VARARGS | METH_KEYWORDS,
MultibyteCodec_Encode__doc__},
{"decode", (PyCFunction)MultibyteCodec_Decode,
METH_VARARGS | METH_KEYWORDS,
MultibyteCodec_Decode__doc__},
{NULL, NULL},
};
static void
multibytecodec_dealloc(MultibyteCodecObject *self)
{
PyObject_Del(self);
}
static PyTypeObject MultibyteCodec_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"MultibyteCodec", /* tp_name */
sizeof(MultibyteCodecObject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)multibytecodec_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 */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iterext */
multibytecodec_methods, /* tp_methods */
};
/**
* Utility functions for stateful codec mechanism
*/
#define STATEFUL_DCTX(o) ((MultibyteStatefulDecoderContext *)(o))
#define STATEFUL_ECTX(o) ((MultibyteStatefulEncoderContext *)(o))
static PyObject *
encoder_encode_stateful(MultibyteStatefulEncoderContext *ctx,
PyObject *unistr, int final)
{
PyObject *ucvt, *r = NULL;
Py_UNICODE *inbuf, *inbuf_end, *inbuf_tmp = NULL;
Py_ssize_t datalen, origpending;
if (PyUnicode_Check(unistr))
ucvt = NULL;
else {
unistr = ucvt = PyObject_Unicode(unistr);
if (unistr == NULL)
return NULL;
else if (!PyUnicode_Check(unistr)) {
PyErr_SetString(PyExc_TypeError,
"couldn't convert the object to unicode.");
Py_DECREF(ucvt);
return NULL;
}
}
datalen = PyUnicode_GET_SIZE(unistr);
origpending = ctx->pendingsize;
if (origpending > 0) {
if (datalen > PY_SSIZE_T_MAX - ctx->pendingsize) {
PyErr_NoMemory();
/* inbuf_tmp == NULL */
goto errorexit;
}
inbuf_tmp = PyMem_New(Py_UNICODE, datalen + ctx->pendingsize);
if (inbuf_tmp == NULL)
goto errorexit;
memcpy(inbuf_tmp, ctx->pending,
Py_UNICODE_SIZE * ctx->pendingsize);
memcpy(inbuf_tmp + ctx->pendingsize,
PyUnicode_AS_UNICODE(unistr),
Py_UNICODE_SIZE * datalen);
datalen += ctx->pendingsize;
ctx->pendingsize = 0;
inbuf = inbuf_tmp;
}
else
inbuf = (Py_UNICODE *)PyUnicode_AS_UNICODE(unistr);
inbuf_end = inbuf + datalen;
r = multibytecodec_encode(ctx->codec, &ctx->state,
(const Py_UNICODE **)&inbuf,
datalen, ctx->errors, final ? MBENC_FLUSH : 0);
if (r == NULL) {
/* recover the original pending buffer */
if (origpending > 0)
memcpy(ctx->pending, inbuf_tmp,
Py_UNICODE_SIZE * origpending);
ctx->pendingsize = origpending;
goto errorexit;
}
if (inbuf < inbuf_end) {
ctx->pendingsize = (Py_ssize_t)(inbuf_end - inbuf);
if (ctx->pendingsize > MAXENCPENDING) {
/* normal codecs can't reach here */
ctx->pendingsize = 0;
PyErr_SetString(PyExc_UnicodeError,
"pending buffer overflow");
goto errorexit;
}
memcpy(ctx->pending, inbuf,
ctx->pendingsize * Py_UNICODE_SIZE);
}
if (inbuf_tmp != NULL)
PyMem_Del(inbuf_tmp);
Py_XDECREF(ucvt);
return r;
errorexit:
if (inbuf_tmp != NULL)
PyMem_Del(inbuf_tmp);
Py_XDECREF(r);
Py_XDECREF(ucvt);
return NULL;
}
static int
decoder_append_pending(MultibyteStatefulDecoderContext *ctx,
MultibyteDecodeBuffer *buf)
{
Py_ssize_t npendings;
npendings = (Py_ssize_t)(buf->inbuf_end - buf->inbuf);
if (npendings + ctx->pendingsize > MAXDECPENDING ||
npendings > PY_SSIZE_T_MAX - ctx->pendingsize) {
PyErr_SetString(PyExc_UnicodeError, "pending buffer overflow");
return -1;
}
memcpy(ctx->pending + ctx->pendingsize, buf->inbuf, npendings);
ctx->pendingsize += npendings;
return 0;
}
static int
decoder_prepare_buffer(MultibyteDecodeBuffer *buf, const char *data,
Py_ssize_t size)
{
buf->inbuf = buf->inbuf_top = (const unsigned char *)data;
buf->inbuf_end = buf->inbuf_top + size;
if (buf->outobj == NULL) { /* only if outobj is not allocated yet */
buf->outobj = PyUnicode_FromUnicode(NULL, size);
if (buf->outobj == NULL)
return -1;
buf->outbuf = PyUnicode_AS_UNICODE(buf->outobj);
buf->outbuf_end = buf->outbuf +
PyUnicode_GET_SIZE(buf->outobj);
}
return 0;
}
static int
decoder_feed_buffer(MultibyteStatefulDecoderContext *ctx,
MultibyteDecodeBuffer *buf)
{
while (buf->inbuf < buf->inbuf_end) {
Py_ssize_t inleft, outleft;
Py_ssize_t r;
inleft = (Py_ssize_t)(buf->inbuf_end - buf->inbuf);
outleft = (Py_ssize_t)(buf->outbuf_end - buf->outbuf);
r = ctx->codec->decode(&ctx->state, ctx->codec->config,
&buf->inbuf, inleft, &buf->outbuf, outleft);
if (r == 0 || r == MBERR_TOOFEW)
break;
else if (multibytecodec_decerror(ctx->codec, &ctx->state,
buf, ctx->errors, r))
return -1;
}
return 0;
}
/**
* MultibyteIncrementalEncoder object
*/
static PyObject *
mbiencoder_encode(MultibyteIncrementalEncoderObject *self,
PyObject *args, PyObject *kwargs)
{
PyObject *data;
int final = 0;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|i:encode",
incrementalkwarglist, &data, &final))
return NULL;
return encoder_encode_stateful(STATEFUL_ECTX(self), data, final);
}
static PyObject *
mbiencoder_reset(MultibyteIncrementalEncoderObject *self)
{
if (self->codec->decreset != NULL &&
self->codec->decreset(&self->state, self->codec->config) != 0)
return NULL;
self->pendingsize = 0;
Py_RETURN_NONE;
}
static struct PyMethodDef mbiencoder_methods[] = {
{"encode", (PyCFunction)mbiencoder_encode,
METH_VARARGS | METH_KEYWORDS, NULL},
{"reset", (PyCFunction)mbiencoder_reset,
METH_NOARGS, NULL},
{NULL, NULL},
};
static PyObject *
mbiencoder_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
MultibyteIncrementalEncoderObject *self;
PyObject *codec = NULL;
char *errors = NULL;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "|s:IncrementalEncoder",
incnewkwarglist, &errors))
return NULL;
self = (MultibyteIncrementalEncoderObject *)type->tp_alloc(type, 0);
if (self == NULL)
return NULL;
codec = PyObject_GetAttrString((PyObject *)type, "codec");
if (codec == NULL)
goto errorexit;
if (!MultibyteCodec_Check(codec)) {
PyErr_SetString(PyExc_TypeError, "codec is unexpected type");
goto errorexit;
}
self->codec = ((MultibyteCodecObject *)codec)->codec;
self->pendingsize = 0;
self->errors = internal_error_callback(errors);
if (self->errors == NULL)
goto errorexit;
if (self->codec->encinit != NULL &&
self->codec->encinit(&self->state, self->codec->config) != 0)
goto errorexit;
Py_DECREF(codec);
return (PyObject *)self;
errorexit:
Py_XDECREF(self);
Py_XDECREF(codec);
return NULL;
}
static int
mbiencoder_init(PyObject *self, PyObject *args, PyObject *kwds)
{
return 0;
}
static int
mbiencoder_traverse(MultibyteIncrementalEncoderObject *self,
visitproc visit, void *arg)
{
if (ERROR_ISCUSTOM(self->errors))
Py_VISIT(self->errors);
return 0;
}
static void
mbiencoder_dealloc(MultibyteIncrementalEncoderObject *self)
{
PyObject_GC_UnTrack(self);
ERROR_DECREF(self->errors);
Py_TYPE(self)->tp_free(self);
}
static PyTypeObject MultibyteIncrementalEncoder_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"MultibyteIncrementalEncoder", /* tp_name */
sizeof(MultibyteIncrementalEncoderObject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)mbiencoder_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 */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC
| Py_TPFLAGS_BASETYPE, /* tp_flags */
0, /* tp_doc */
(traverseproc)mbiencoder_traverse, /* tp_traverse */
0, /* tp_clear */