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cpython/Modules/cjkcodecs/multibytecodec.c

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/*
* multibytecodec.c: Common Multibyte Codec Implementation
*
* Written by Hye-Shik Chang <perky@FreeBSD.org>
* $CJKCodecs: multibytecodec.c,v 1.6 2004/01/17 11:26:10 perky Exp $
*/
#include "Python.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 registerd with\n\
codecs.register_error that is able to handle UnicodeDecodeErrors.");
PyDoc_STRVAR(MultibyteCodec_StreamReader__doc__,
"I.StreamReader(stream[, errors]) -> StreamReader instance");
PyDoc_STRVAR(MultibyteCodec_StreamWriter__doc__,
"I.StreamWriter(stream[, errors]) -> StreamWriter instance");
static char *codeckwarglist[] = {"input", "errors", NULL};
static char *streamkwarglist[] = {"stream", "errors", NULL};
static PyObject *multibytecodec_encode(MultibyteCodec *,
MultibyteCodec_State *, const Py_UNICODE **, size_t,
PyObject *, int);
static PyObject *mbstreamreader_create(MultibyteCodec *,
PyObject *, const char *);
static PyObject *mbstreamwriter_create(MultibyteCodec *,
PyObject *, const char *);
#define MBENC_RESET MBENC_MAX<<1 /* reset after an encoding session */
static PyObject *
make_tuple(PyObject *unicode, int len)
{
PyObject *v, *w;
if (unicode == NULL)
return NULL;
v = PyTuple_New(2);
if (v == NULL) {
Py_DECREF(unicode);
return NULL;
}
PyTuple_SET_ITEM(v, 0, unicode);
w = PyInt_FromLong(len);
if (w == NULL) {
Py_DECREF(v);
return NULL;
}
PyTuple_SET_ITEM(v, 1, w);
return v;
}
static PyObject *
get_errorcallback(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 PyCodec_LookupError(errors);
}
}
static int
expand_encodebuffer(MultibyteEncodeBuffer *buf, int esize)
{
int orgpos, orgsize;
orgpos = (int)((char*)buf->outbuf - PyString_AS_STRING(buf->outobj));
orgsize = PyString_GET_SIZE(buf->outobj);
if (_PyString_Resize(&buf->outobj, orgsize + (
esize < (orgsize >> 1) ? (orgsize >> 1) | 1 : esize)) == -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 RESERVE_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, int esize)
{
int orgpos, orgsize;
orgpos = (int)(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 RESERVE_DECODEBUFFER(buf, s) { \
if ((s) < 1 || (buf)->outbuf + (s) > (buf)->outbuf_end) \
if (expand_decodebuffer(buf, s) == -1) \
goto errorexit; \
}
static int
multibytecodec_encerror(MultibyteCodec *codec,
MultibyteCodec_State *state,
MultibyteEncodeBuffer *buf,
PyObject *errors, int e)
{
PyObject *retobj = NULL, *retstr = NULL, *argsobj, *tobj;
int retstrsize, newpos;
const char *reason;
size_t esize;
int start, end;
if (e > 0) {
reason = "illegal multibyte sequence";
esize = e;
} else {
switch (e) {
case MBERR_TOOSMALL:
RESERVE_ENCODEBUFFER(buf, -1);
return 0; /* retry it */
case MBERR_TOOFEW:
reason = "incomplete multibyte sequence";
esize = (size_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;
int r;
for (;;) {
size_t outleft;
outleft = (size_t)(buf->outbuf_end - buf->outbuf);
r = codec->encode(state, &inbuf, 1, &buf->outbuf, outleft, 0);
if (r == MBERR_TOOSMALL) {
RESERVE_ENCODEBUFFER(buf, -1);
continue;
} else
break;
}
if (r != 0) {
RESERVE_ENCODEBUFFER(buf, 1);
*buf->outbuf++ = '?';
}
}
if (errors == ERROR_IGNORE || errors == ERROR_REPLACE) {
buf->inbuf += esize;
return 0;
}
start = (int)(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, (int)(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;
}
argsobj = PyTuple_New(1);
if (argsobj == NULL)
goto errorexit;
PyTuple_SET_ITEM(argsobj, 0, buf->excobj);
Py_INCREF(buf->excobj);
retobj = PyObject_CallObject(errors, argsobj);
Py_DECREF(argsobj);
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))) {
PyErr_SetString(PyExc_ValueError,
"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);
RESERVE_ENCODEBUFFER(buf, retstrsize);
memcpy(buf->outbuf, PyString_AS_STRING(retstr), retstrsize);
buf->outbuf += retstrsize;
newpos = (int)PyInt_AS_LONG(PyTuple_GET_ITEM(retobj, 1));
if (newpos < 0)
newpos += (int)(buf->inbuf_end - buf->inbuf_top);
if (newpos < 0 || buf->inbuf_top + newpos > buf->inbuf_end) {
PyErr_Format(PyExc_IndexError,
"position %d 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, int e)
{
PyObject *argsobj, *retobj = NULL, *retuni = NULL;
int retunisize, newpos;
const char *reason;
size_t esize;
int start, end;
if (e > 0) {
reason = "illegal multibyte sequence";
esize = e;
} else {
switch (e) {
case MBERR_TOOSMALL:
RESERVE_DECODEBUFFER(buf, -1);
return 0; /* retry it */
case MBERR_TOOFEW:
reason = "incomplete multibyte sequence";
esize = (size_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) {
RESERVE_DECODEBUFFER(buf, 1);
*buf->outbuf++ = Py_UNICODE_REPLACEMENT_CHARACTER;
}
if (errors == ERROR_IGNORE || errors == ERROR_REPLACE) {
buf->inbuf += esize;
return 0;
}
start = (int)(buf->inbuf - buf->inbuf_top);
end = start + esize;
/* use cached exception object if available */
if (buf->excobj == NULL) {
buf->excobj = PyUnicodeDecodeError_Create(codec->encoding,
buf->inbuf_top, (int)(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;
}
argsobj = PyTuple_New(1);
if (argsobj == NULL)
goto errorexit;
PyTuple_SET_ITEM(argsobj, 0, buf->excobj);
Py_INCREF(buf->excobj);
retobj = PyObject_CallObject(errors, argsobj);
Py_DECREF(argsobj);
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))) {
PyErr_SetString(PyExc_ValueError,
"decoding error handler must return (unicode, int) tuple");
goto errorexit;
}
retunisize = PyUnicode_GET_SIZE(retuni);
if (retunisize > 0) {
RESERVE_DECODEBUFFER(buf, retunisize);
memcpy((char *)buf->outbuf, PyUnicode_AS_DATA(retuni),
retunisize * Py_UNICODE_SIZE);
buf->outbuf += retunisize;
}
newpos = (int)PyInt_AS_LONG(PyTuple_GET_ITEM(retobj, 1));
if (newpos < 0)
newpos += (int)(buf->inbuf_end - buf->inbuf_top);
if (newpos < 0 || buf->inbuf_top + newpos > buf->inbuf_end) {
PyErr_Format(PyExc_IndexError,
"position %d 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, size_t datalen,
PyObject *errors, int flags)
{
MultibyteEncodeBuffer buf;
int 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;
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) {
size_t inleft, outleft;
/* we don't reuse inleft and outleft here.
* error callbacks can relocate the cursor anywhere on buffer */
inleft = (size_t)(buf.inbuf_end - buf.inbuf);
outleft = (size_t)(buf.outbuf_end - buf.outbuf);
r = codec->encode(state, &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 (;;) {
size_t outleft;
outleft = (size_t)(buf.outbuf_end - buf.outbuf);
r = codec->encreset(state, &buf.outbuf, outleft);
if (r == 0)
break;
else if (multibytecodec_encerror(codec, state, &buf, errors, r))
goto errorexit;
}
finalsize = (int)((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;
const char *errors = NULL;
int datalen;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|z:encode",
codeckwarglist, &arg, &errors))
return NULL;
if (PyUnicode_Check(arg)) {
data = PyUnicode_AS_UNICODE(arg);
datalen = PyUnicode_GET_SIZE(arg);
arg = NULL; /* forget reference */
} else {
arg = PyObject_Unicode(arg);
if (arg == NULL || !PyUnicode_Check(arg)) {
Py_XDECREF(arg);
return NULL;
}
data = PyUnicode_AS_UNICODE(arg);
datalen = PyUnicode_GET_SIZE(arg);
}
errorcb = get_errorcallback(errors);
if (errorcb == NULL) {
Py_XDECREF(arg);
return NULL;
}
if (self->codec->encinit != NULL && self->codec->encinit(&state) != 0)
goto errorexit;
r = multibytecodec_encode(self->codec, &state, (const Py_UNICODE **)&data,
datalen, errorcb, MBENC_FLUSH | MBENC_RESET);
if (r == NULL)
goto errorexit;
if (errorcb > ERROR_MAX) {
Py_DECREF(errorcb);
}
Py_XDECREF(arg);
return make_tuple(r, datalen);
errorexit:
if (errorcb > ERROR_MAX) {
Py_DECREF(errorcb);
}
Py_XDECREF(arg);
return NULL;
}
static PyObject *
MultibyteCodec_Decode(MultibyteCodecObject *self,
PyObject *args, PyObject *kwargs)
{
MultibyteCodec_State state;
MultibyteDecodeBuffer buf;
PyObject *errorcb;
const char *data, *errors = NULL;
int datalen, finalsize;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s#|z:decode",
codeckwarglist, &data, &datalen, &errors))
return NULL;
errorcb = get_errorcallback(errors);
if (errorcb == NULL)
return NULL;
if (datalen == 0) {
if (errorcb > ERROR_MAX)
{Py_DECREF(errorcb);}
return make_tuple(PyUnicode_FromUnicode(NULL, 0), 0);
}
buf.outobj = 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) != 0)
goto errorexit;
while (buf.inbuf < buf.inbuf_end) {
size_t inleft, outleft;
int r;
inleft = (size_t)(buf.inbuf_end - buf.inbuf);
outleft = (size_t)(buf.outbuf_end - buf.outbuf);
r = self->codec->decode(&state, &buf.inbuf, inleft,
&buf.outbuf, outleft);
if (r == 0)
break;
else if (multibytecodec_decerror(self->codec, &state, &buf, errorcb, r))
goto errorexit;
}
finalsize = (int)(buf.outbuf - PyUnicode_AS_UNICODE(buf.outobj));
if (finalsize != PyUnicode_GET_SIZE(buf.outobj))
if (PyUnicode_Resize(&buf.outobj, finalsize) == -1)
goto errorexit;
Py_XDECREF(buf.excobj);
if (errorcb > ERROR_MAX)
{Py_DECREF(errorcb);}
return make_tuple(buf.outobj, datalen);
errorexit:
if (errorcb > ERROR_MAX)
{Py_DECREF(errorcb);}
Py_XDECREF(buf.excobj);
Py_XDECREF(buf.outobj);
return NULL;
}
static PyObject *
MultibyteCodec_StreamReader(MultibyteCodecObject *self,
PyObject *args, PyObject *kwargs)
{
PyObject *stream;
char *errors = NULL;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|s:StreamReader",
streamkwarglist, &stream, &errors))
return NULL;
return mbstreamreader_create(self->codec, stream, errors);
}
static PyObject *
MultibyteCodec_StreamWriter(MultibyteCodecObject *self,
PyObject *args, PyObject *kwargs)
{
PyObject *stream;
char *errors = NULL;
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|s:StreamWriter",
streamkwarglist, &stream, &errors))
return NULL;
return mbstreamwriter_create(self->codec, stream, errors);
}
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__},
{"StreamReader",(PyCFunction)MultibyteCodec_StreamReader,
METH_VARARGS | METH_KEYWORDS,
MultibyteCodec_StreamReader__doc__},
{"StreamWriter",(PyCFunction)MultibyteCodec_StreamWriter,
METH_VARARGS | METH_KEYWORDS,
MultibyteCodec_StreamWriter__doc__},
{NULL, NULL},
};
static void
multibytecodec_dealloc(MultibyteCodecObject *self)
{
PyObject_Del(self);
}
static PyTypeObject MultibyteCodec_Type = {
PyObject_HEAD_INIT(NULL)
0, /* ob_size */
"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 */
};
static PyObject *
mbstreamreader_iread(MultibyteStreamReaderObject *self,
const char *method, int sizehint)
{
MultibyteDecodeBuffer buf;
PyObject *cres;
int rsize, r, finalsize = 0;
if (sizehint == 0)
return PyUnicode_FromUnicode(NULL, 0);
buf.outobj = buf.excobj = NULL;
cres = NULL;
for (;;) {
if (sizehint < 0)
cres = PyObject_CallMethod(self->stream, (char *)method, NULL);
else
cres = PyObject_CallMethod(self->stream,
(char *)method, "i", sizehint);
if (cres == NULL)
goto errorexit;
if (!PyString_Check(cres)) {
PyErr_SetString(PyExc_TypeError,
"stream function returned a non-string object");
goto errorexit;
}
if (self->pendingsize > 0) {
PyObject *ctr;
char *ctrdata;
rsize = PyString_GET_SIZE(cres) + self->pendingsize;
ctr = PyString_FromStringAndSize(NULL, rsize);
if (ctr == NULL)
goto errorexit;
ctrdata = PyString_AS_STRING(ctr);
memcpy(ctrdata, self->pending, self->pendingsize);
memcpy(ctrdata + self->pendingsize,
PyString_AS_STRING(cres), PyString_GET_SIZE(cres));
Py_DECREF(cres);
cres = ctr;
self->pendingsize = 0;
}
rsize = PyString_GET_SIZE(cres);
buf.inbuf = buf.inbuf_top = (unsigned char *)PyString_AS_STRING(cres);
buf.inbuf_end = buf.inbuf_top + rsize;
if (buf.outobj == NULL) {
buf.outobj = PyUnicode_FromUnicode(NULL, rsize);
if (buf.outobj == NULL)
goto errorexit;
buf.outbuf = PyUnicode_AS_UNICODE(buf.outobj);
buf.outbuf_end = buf.outbuf + PyUnicode_GET_SIZE(buf.outobj);
}
r = 0;
if (rsize > 0)
while (buf.inbuf < buf.inbuf_end) {
size_t inleft, outleft;
inleft = (size_t)(buf.inbuf_end - buf.inbuf);
outleft = (size_t)(buf.outbuf_end - buf.outbuf);
r = self->codec->decode(&self->state, &buf.inbuf, inleft,
&buf.outbuf, outleft);
if (r == 0 || r == MBERR_TOOFEW)
break;
else if (multibytecodec_decerror(self->codec,
&self->state, &buf, self->errors, r))
goto errorexit;
}
if (rsize == 0 || sizehint < 0) { /* end of file */
if (buf.inbuf < buf.inbuf_end &&
multibytecodec_decerror(self->codec, &self->state, &buf,
self->errors, MBERR_TOOFEW))
goto errorexit;
}
if (buf.inbuf < buf.inbuf_end) { /* pending sequence exists */
size_t npendings;
/* we can't assume that pendingsize is still 0 here. because
* this function can be called recursively from error callback */
npendings = (size_t)(buf.inbuf_end - buf.inbuf);
if (npendings + self->pendingsize > MAXDECPENDING) {
PyErr_SetString(PyExc_RuntimeError,
"pending buffer overflow");
goto errorexit;
}
memcpy(self->pending + self->pendingsize, buf.inbuf, npendings);
self->pendingsize += npendings;
}
finalsize = (int)(buf.outbuf - PyUnicode_AS_UNICODE(buf.outobj));
Py_DECREF(cres);
cres = NULL;
if (sizehint < 0 || finalsize != 0 || rsize == 0)
break;
sizehint = 1; /* read 1 more byte and retry */
}
if (finalsize != PyUnicode_GET_SIZE(buf.outobj))
if (PyUnicode_Resize(&buf.outobj, finalsize) == -1)
goto errorexit;
Py_XDECREF(cres);
Py_XDECREF(buf.excobj);
return buf.outobj;
errorexit:
Py_XDECREF(cres);
Py_XDECREF(buf.excobj);
Py_XDECREF(buf.outobj);
return NULL;
}
static PyObject *
mbstreamreader_read(MultibyteStreamReaderObject *self, PyObject *args)
{
PyObject *sizeobj = NULL;
long size;
if (!PyArg_ParseTuple(args, "|O:read", &sizeobj))
return NULL;
if (sizeobj == Py_None || sizeobj == NULL)
size = -1;
else if (PyInt_Check(sizeobj))
size = PyInt_AsLong(sizeobj);
else {
PyErr_SetString(PyExc_TypeError, "arg 1 must be an integer");
return NULL;
}
return mbstreamreader_iread(self, "read", size);
}
static PyObject *
mbstreamreader_readline(MultibyteStreamReaderObject *self, PyObject *args)
{
PyObject *sizeobj = NULL;
long size;
if (!PyArg_ParseTuple(args, "|O:readline", &sizeobj))
return NULL;
if (sizeobj == Py_None || sizeobj == NULL)
size = -1;
else if (PyInt_Check(sizeobj))
size = PyInt_AsLong(sizeobj);
else {
PyErr_SetString(PyExc_TypeError, "arg 1 must be an integer");
return NULL;
}
return mbstreamreader_iread(self, "readline", size);
}
static PyObject *
mbstreamreader_readlines(MultibyteStreamReaderObject *self, PyObject *args)
{
PyObject *sizehintobj = NULL, *r, *sr;
long sizehint;
if (!PyArg_ParseTuple(args, "|O:readlines", &sizehintobj))
return NULL;
if (sizehintobj == Py_None || sizehintobj == NULL)
sizehint = -1;
else if (PyInt_Check(sizehintobj))
sizehint = PyInt_AsLong(sizehintobj);
else {
PyErr_SetString(PyExc_TypeError, "arg 1 must be an integer");
return NULL;
}
r = mbstreamreader_iread(self, "read", sizehint);
if (r == NULL)
return NULL;
sr = PyUnicode_Splitlines(r, 1);
Py_DECREF(r);
return sr;
}
static PyObject *
mbstreamreader_reset(MultibyteStreamReaderObject *self)
{
if (self->codec->decreset != NULL &&
self->codec->decreset(&self->state) != 0)
return NULL;
self->pendingsize = 0;
Py_INCREF(Py_None);
return Py_None;
}
static struct PyMethodDef mbstreamreader_methods[] = {
{"read", (PyCFunction)mbstreamreader_read,
METH_VARARGS, NULL},
{"readline", (PyCFunction)mbstreamreader_readline,
METH_VARARGS, NULL},
{"readlines", (PyCFunction)mbstreamreader_readlines,
METH_VARARGS, NULL},
{"reset", (PyCFunction)mbstreamreader_reset,
METH_NOARGS, NULL},
{NULL, NULL},
};
static void
mbstreamreader_dealloc(MultibyteStreamReaderObject *self)
{
if (self->errors > ERROR_MAX) {
Py_DECREF(self->errors);
}
Py_DECREF(self->stream);
PyObject_Del(self);
}
static PyTypeObject MultibyteStreamReader_Type = {
PyObject_HEAD_INIT(NULL)
0, /* ob_size */
"MultibyteStreamReader", /* tp_name */
sizeof(MultibyteStreamReaderObject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)mbstreamreader_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 */
mbstreamreader_methods, /* tp_methods */
};
static int
mbstreamwriter_iwrite(MultibyteStreamWriterObject *self,
PyObject *unistr)
{
PyObject *wr, *r = NULL;
Py_UNICODE *inbuf, *inbuf_end, *inbuf_tmp = NULL;
int rsize;
if (!PyUnicode_Check(unistr)) {
PyErr_SetString(PyExc_TypeError,
"only unicode objects are encodable.");
return -1;
}
rsize = PyUnicode_GET_SIZE(unistr);
if (rsize == 0)
return 0;
if (self->pendingsize > 0) {
inbuf_tmp = PyMem_New(Py_UNICODE, rsize + self->pendingsize);
if (inbuf_tmp == NULL)
goto errorexit;
memcpy(inbuf_tmp, self->pending, Py_UNICODE_SIZE * self->pendingsize);
memcpy(inbuf_tmp + self->pendingsize, PyUnicode_AS_UNICODE(unistr),
Py_UNICODE_SIZE * rsize);
rsize += self->pendingsize;
self->pendingsize = 0;
inbuf = inbuf_tmp;
} else
inbuf = (Py_UNICODE *)PyUnicode_AS_UNICODE(unistr);
inbuf_end = inbuf + rsize;
r = multibytecodec_encode(self->codec, &self->state,
(const Py_UNICODE **)&inbuf, rsize, self->errors, 0);
if (r == NULL)
goto errorexit;
if (inbuf < inbuf_end) {
self->pendingsize = (int)(inbuf_end - inbuf);
if (self->pendingsize > MAXENCPENDING) {
self->pendingsize = 0;
PyErr_SetString(PyExc_RuntimeError, "pending buffer overflow");
goto errorexit;
}
memcpy(self->pending, inbuf, self->pendingsize * Py_UNICODE_SIZE);
}
wr = PyObject_CallMethod(self->stream, "write", "O", r);
if (wr == NULL)
goto errorexit;
if (inbuf_tmp != NULL)
PyMem_Del(inbuf_tmp);
Py_DECREF(r);
Py_DECREF(wr);
return 0;
errorexit:
if (inbuf_tmp != NULL)
PyMem_Del(inbuf_tmp);
Py_XDECREF(r);
return -1;
}
static PyObject *
mbstreamwriter_write(MultibyteStreamWriterObject *self, PyObject *args)
{
PyObject *strobj;
if (!PyArg_ParseTuple(args, "O:write", &strobj))
return NULL;
if (mbstreamwriter_iwrite(self, strobj))
return NULL;
else {
Py_INCREF(Py_None);
return Py_None;
}
}
static PyObject *
mbstreamwriter_writelines(MultibyteStreamWriterObject *self, PyObject *args)
{
PyObject *lines, *strobj;
int i, r;
if (!PyArg_ParseTuple(args, "O:writelines", &lines))
return NULL;
if (!PySequence_Check(lines)) {
PyErr_SetString(PyExc_TypeError, "arg must be a sequence object");
return NULL;
}
for (i = 0; i < PySequence_Length(lines); i++) {
/* length can be changed even within this loop */
strobj = PySequence_GetItem(lines, i);
if (strobj == NULL)
return NULL;
r = mbstreamwriter_iwrite(self, strobj);
Py_DECREF(strobj);
if (r == -1)
return NULL;
}
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
mbstreamwriter_reset(MultibyteStreamWriterObject *self)
{
const Py_UNICODE *pending;
PyObject *pwrt;
pending = self->pending;
pwrt = multibytecodec_encode(self->codec, &self->state,
&pending, self->pendingsize, self->errors,
MBENC_FLUSH | MBENC_RESET);
/* some pending buffer can be truncated when UnicodeEncodeError is
* raised on 'strict' mode. but, 'reset' method is designed to
* reset the pending buffer or states so failed string sequence
* ought to be missed */
self->pendingsize = 0;
if (pwrt == NULL)
return NULL;
if (PyString_Size(pwrt) > 0) {
PyObject *wr;
wr = PyObject_CallMethod(self->stream, "write", "O", pwrt);
if (wr == NULL) {
Py_DECREF(pwrt);
return NULL;
}
}
Py_DECREF(pwrt);
Py_INCREF(Py_None);
return Py_None;
}
static void
mbstreamwriter_dealloc(MultibyteStreamWriterObject *self)
{
if (self->errors > ERROR_MAX) {
Py_DECREF(self->errors);
}
Py_DECREF(self->stream);
PyObject_Del(self);
}
static struct PyMethodDef mbstreamwriter_methods[] = {
{"write", (PyCFunction)mbstreamwriter_write,
METH_VARARGS, NULL},
{"writelines", (PyCFunction)mbstreamwriter_writelines,
METH_VARARGS, NULL},
{"reset", (PyCFunction)mbstreamwriter_reset,
METH_NOARGS, NULL},
{NULL, NULL},
};
static PyTypeObject MultibyteStreamWriter_Type = {
PyObject_HEAD_INIT(NULL)
0, /* ob_size */
"MultibyteStreamWriter", /* tp_name */
sizeof(MultibyteStreamWriterObject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)mbstreamwriter_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 */
mbstreamwriter_methods, /* tp_methods */
};
static PyObject *
__create_codec(PyObject *ignore, PyObject *arg)
{
MultibyteCodecObject *self;
if (!PyCObject_Check(arg)) {
PyErr_SetString(PyExc_ValueError, "argument type invalid");
return NULL;
}
self = PyObject_New(MultibyteCodecObject, &MultibyteCodec_Type);
if (self == NULL)
return NULL;
self->codec = PyCObject_AsVoidPtr(arg);
return (PyObject *)self;
}
static PyObject *
mbstreamreader_create(MultibyteCodec *codec,
PyObject *stream, const char *errors)
{
MultibyteStreamReaderObject *self;
self = PyObject_New(MultibyteStreamReaderObject,
&MultibyteStreamReader_Type);
if (self == NULL)
return NULL;
self->codec = codec;
self->stream = stream;
Py_INCREF(stream);
self->pendingsize = 0;
self->errors = get_errorcallback(errors);
if (self->errors == NULL)
goto errorexit;
if (self->codec->decinit != NULL && self->codec->decinit(&self->state) != 0)
goto errorexit;
return (PyObject *)self;
errorexit:
Py_XDECREF(self);
return NULL;
}
static PyObject *
mbstreamwriter_create(MultibyteCodec *codec,
PyObject *stream, const char *errors)
{
MultibyteStreamWriterObject *self;
self = PyObject_New(MultibyteStreamWriterObject,
&MultibyteStreamWriter_Type);
if (self == NULL)
return NULL;
self->codec = codec;
self->stream = stream;
Py_INCREF(stream);
self->pendingsize = 0;
self->errors = get_errorcallback(errors);
if (self->errors == NULL)
goto errorexit;
if (self->codec->encinit != NULL && self->codec->encinit(&self->state) != 0)
goto errorexit;
return (PyObject *)self;
errorexit:
Py_XDECREF(self);
return NULL;
}
static struct PyMethodDef __methods[] = {
{"__create_codec", (PyCFunction)__create_codec, METH_O},
{NULL, NULL},
};
void
init_multibytecodec(void)
{
Py_InitModule("_multibytecodec", __methods);
if (PyErr_Occurred())
Py_FatalError("can't initialize the _multibytecodec module");
}
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