620 lines
21 KiB
C
620 lines
21 KiB
C
/*
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* _iconv_codec.c
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*
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* libiconv adaptor for Python iconvcodec
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*
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* Author : Hye-Shik Chang <perky@FreeBSD.org>
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* Created : 17 January 2003
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*/
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#include "Python.h"
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#include <string.h>
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#include <iconv.h>
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static const char *__version__ = "$Revision$";
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#if Py_USING_UNICODE
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# if Py_UNICODE_SIZE == 2
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# ifdef __GNU_LIBRARY__
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# define UNICODE_ENCODING "ucs-2"
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# else
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# define UNICODE_ENCODING "ucs-2-internal"
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# endif
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# define MBENCODED_LENGTH_MAX 4
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# elif Py_UNICODE_SIZE == 4
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# ifdef __GNU_LIBRARY__
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# define UNICODE_ENCODING "ucs-4"
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# else
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# define UNICODE_ENCODING "ucs-4-internal"
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# endif
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# define MBENCODED_LENGTH_MAX 6
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# endif
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#else
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# error "Unicode is not available"
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#endif
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typedef struct {
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PyObject_HEAD
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iconv_t enchdl, dechdl;
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char *encoding;
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} iconvcodecObject;
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PyDoc_STRVAR(iconvcodec_doc, "iconvcodec object");
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staticforward PyTypeObject iconvcodec_Type;
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#define ERROR_STRICT (PyObject *)(1)
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#define ERROR_IGNORE (PyObject *)(2)
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#define ERROR_REPLACE (PyObject *)(3)
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#define ERROR_MAX ERROR_REPLACE
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#define REPLACEMENT_CHAR_DECODE 0xFFFD
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#define REPLACEMENT_CHAR_ENCODE '?'
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#define DEFAULT_ENCODING "utf-8"
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static PyObject *
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get_errorcallback(const char *errors)
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{
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if (errors == NULL || strcmp(errors, "strict") == 0)
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return ERROR_STRICT;
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else if (strcmp(errors, "ignore") == 0)
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return ERROR_IGNORE;
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else if (strcmp(errors, "replace") == 0)
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return ERROR_REPLACE;
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else
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return PyCodec_LookupError(errors);
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}
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PyDoc_STRVAR(iconvcodec_encode__doc__,
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"I.encode(unicode, [,errors]) -> (string, length consumed)\n\
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\n\
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Return an encoded string version of `unicode'. errors may be given to\n\
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set a different error handling scheme. Default is 'strict' meaning that\n\
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encoding errors raise a UnicodeEncodeError. Other possible values are\n\
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'ignore', 'replace' and 'xmlcharrefreplace' as well as any other name\n\
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registered with codecs.register_error that can handle UnicodeEncodeErrors.");
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static PyObject *
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iconvcodec_encode(iconvcodecObject *self, PyObject *args, PyObject *kwargs)
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{
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static char *kwlist[] = { "input", "errors", NULL };
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Py_UNICODE *input;
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int inputlen;
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char *errors = NULL/*strict*/, *out, *out_top;
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const char *inp, *inp_top;
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size_t inplen, inplen_total, outlen, outlen_total, estep;
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PyObject *outputobj = NULL, *errorcb = NULL,
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*exceptionobj = NULL;
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if (!PyArg_ParseTupleAndKeywords(args, kwargs, "u#|s:encode",
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kwlist, &input, &inputlen, &errors))
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return NULL; /* TypeError */
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errorcb = get_errorcallback(errors);
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if (errorcb == NULL)
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return NULL; /* LookupError or something else from error handler */
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inp = inp_top = (char *)input;
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inplen = inplen_total = (size_t)(inputlen * Py_UNICODE_SIZE);
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outlen = inputlen * MBENCODED_LENGTH_MAX;
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if (outlen < 16)
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outlen = 16; /* for iso-2022 codecs */
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outputobj = PyString_FromStringAndSize(NULL, outlen);
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if (outputobj == NULL)
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return NULL;
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out = out_top = PyString_AS_STRING(outputobj);
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outlen_total = outlen;
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estep = inputlen * Py_UNICODE_SIZE / 2;
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#define RESIZE_OUTBUFFER(size) { \
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size_t toadd = (size); \
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outlen_total += toadd; \
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outlen += toadd; \
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if (_PyString_Resize(&outputobj, outlen_total) == -1) \
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goto errorexit; \
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out = PyString_AS_STRING(outputobj) + (out - out_top); \
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out_top = PyString_AS_STRING(outputobj); \
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}
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while (inplen > 0) {
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if (iconv(self->enchdl, (char**)&inp, &inplen, &out, &outlen) == -1) {
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char reason[128];
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int errpos;
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if (errno == E2BIG) {
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RESIZE_OUTBUFFER(estep);
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continue;
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}
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if (errorcb == ERROR_IGNORE || errorcb == ERROR_REPLACE) {
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inplen -= Py_UNICODE_SIZE;
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inp += Py_UNICODE_SIZE;
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if (errorcb == ERROR_REPLACE) {
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if (outlen < 1)
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RESIZE_OUTBUFFER(errno == EINVAL ? 1 : estep);
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outlen--;
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*out++ = REPLACEMENT_CHAR_ENCODE;
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}
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if (errno == EINVAL) break;
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else continue;
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}
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errpos = (int)(inp - inp_top) / Py_UNICODE_SIZE;
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sprintf(reason, "Undefined character map from "
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#if Py_UNICODE_SIZE == 2
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"\\u%04x"
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#elif Py_UNICODE_SIZE == 4
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"\\u%08x"
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#endif
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, *(Py_UNICODE *)inp);
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if (exceptionobj == NULL) {
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if ((exceptionobj = PyUnicodeEncodeError_Create(
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self->encoding, input, inputlen,
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errpos, errpos + 1, reason)) == NULL)
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goto errorexit;
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} else {
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if (PyUnicodeEncodeError_SetStart(exceptionobj, errpos) != 0)
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goto errorexit;
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if (PyUnicodeEncodeError_SetEnd(exceptionobj, errpos + 1) != 0)
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goto errorexit;
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if (PyUnicodeEncodeError_SetReason(exceptionobj, reason) != 0)
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goto errorexit;
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}
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if (errorcb == ERROR_STRICT) {
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PyCodec_StrictErrors(exceptionobj);
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goto errorexit;
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} else {
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PyObject *argsobj, *retobj, *retuni;
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long newpos;
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argsobj = PyTuple_New(1);
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if (argsobj == NULL)
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goto errorexit;
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PyTuple_SET_ITEM(argsobj, 0, exceptionobj);
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Py_INCREF(exceptionobj);
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retobj = PyObject_CallObject(errorcb, argsobj);
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Py_DECREF(argsobj);
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if (retobj == NULL)
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goto errorexit;
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if (!PyTuple_Check(retobj) || PyTuple_GET_SIZE(retobj) != 2 ||
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!PyUnicode_Check((retuni = PyTuple_GET_ITEM(retobj, 0))) ||
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!PyInt_Check(PyTuple_GET_ITEM(retobj, 1))) {
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Py_DECREF(retobj);
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PyErr_SetString(PyExc_ValueError, "encoding error handler "
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"must return (unicode, int) tuple");
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goto errorexit;
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}
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if (PyUnicode_GET_SIZE(retuni) > 0) {
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#define errorexit errorexit_cbpad
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PyObject *retstr = NULL;
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int retstrsize;
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retstr = PyUnicode_AsEncodedString(
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retuni, self->encoding, NULL);
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if (retstr == NULL || !PyString_Check(retstr))
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goto errorexit;
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retstrsize = PyString_GET_SIZE(retstr);
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if (outlen < retstrsize)
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RESIZE_OUTBUFFER(errno == EINVAL || retstrsize > estep
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? retstrsize - outlen : estep);
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memcpy(out, PyString_AS_STRING(retstr), retstrsize);
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out += retstrsize;
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outlen -= retstrsize;
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#undef errorexit
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if (0) {
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errorexit_cbpad: Py_XDECREF(retobj);
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Py_XDECREF(retstr);
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goto errorexit;
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}
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Py_DECREF(retstr);
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}
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newpos = PyInt_AS_LONG(PyTuple_GET_ITEM(retobj, 1));
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Py_DECREF(retobj);
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if (newpos < 0)
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newpos = inputlen - newpos;
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if (newpos < 0 || newpos >= inputlen)
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break;
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inp = inp_top + Py_UNICODE_SIZE * newpos;
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inplen = inplen_total - Py_UNICODE_SIZE * newpos;
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}
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} else
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break;
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}
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#undef RESIZE_OUTBUFFER
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{
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PyObject *rettup;
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int finalsize;
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finalsize = (int)(out - out_top);
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if (finalsize != outlen_total) {
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if (_PyString_Resize(&outputobj, finalsize) == -1)
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goto errorexit;
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}
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if (errorcb > ERROR_MAX) {
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Py_DECREF(errorcb);
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}
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Py_XDECREF(exceptionobj);
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rettup = PyTuple_New(2);
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if (rettup == NULL) {
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Py_DECREF(outputobj);
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return NULL;
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}
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PyTuple_SET_ITEM(rettup, 0, outputobj);
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PyTuple_SET_ITEM(rettup, 1, PyInt_FromLong(inputlen));
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return rettup;
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}
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errorexit:
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Py_XDECREF(outputobj);
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if (errorcb > ERROR_MAX) {
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Py_DECREF(errorcb);
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}
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Py_XDECREF(exceptionobj);
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return NULL;
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}
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PyDoc_STRVAR(iconvcodec_decode__doc__,
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"I.decode(string, [,errors]) -> (unicodeobject, length consumed)\n\
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\n\
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Decodes `string' using I, an iconvcodec instance. errors may be given\n\
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to set a different error handling scheme. Default is 'strict' meaning\n\
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that encoding errors raise a UnicodeDecodeError. Other possible values\n\
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are 'ignore' and 'replace' as well as any other name registerd with\n\
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codecs.register_error that is able to handle UnicodeDecodeErrors.");
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static PyObject *
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iconvcodec_decode(iconvcodecObject *self, PyObject *args, PyObject *kwargs)
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{
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static char *kwlist[] = { "input", "errors", NULL };
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char *errors = NULL/*strict*/, *out, *out_top;
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const char *inp, *inp_top;
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int inplen_int;
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size_t inplen, inplen_total, outlen, outlen_total, estep;
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PyObject *outputobj = NULL, *errorcb = NULL,
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*exceptionobj = NULL;
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if (!PyArg_ParseTupleAndKeywords(args, kwargs, "s#|s:decode",
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kwlist, &inp, &inplen_int, &errors))
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return NULL; /* TypeError */
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errorcb = get_errorcallback(errors);
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if (errorcb == NULL)
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return NULL; /* LookupError or something else from error handler */
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inp_top = inp;
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inplen_total = inplen = (size_t)inplen_int;
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outputobj = PyUnicode_FromUnicode(NULL, inplen);
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if (outputobj == NULL)
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return NULL;
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outlen_total = outlen = PyUnicode_GET_DATA_SIZE(outputobj);
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out = out_top = (char *)PyUnicode_AS_UNICODE(outputobj);
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estep = outlen / 2;
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#define RESIZE_OUTBUFFER(size) { \
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size_t toadd = (size); \
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outlen_total += toadd; \
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outlen += toadd; \
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if (PyUnicode_Resize(&outputobj, outlen_total/Py_UNICODE_SIZE) == -1) \
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goto errorexit; \
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out = (char *)PyUnicode_AS_UNICODE(outputobj) + (out - out_top); \
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out_top = (char *)PyUnicode_AS_UNICODE(outputobj); \
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}
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while (inplen > 0) {
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if (iconv(self->dechdl, (char**)&inp, &inplen, &out, &outlen) == -1) {
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char reason[128], *reasonpos = (char *)reason;
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int errpos;
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if (errno == E2BIG) {
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RESIZE_OUTBUFFER(estep);
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continue;
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}
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if (errorcb == ERROR_IGNORE || errorcb == ERROR_REPLACE) {
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inplen--; inp++;
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if (errorcb == ERROR_REPLACE) {
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Py_UNICODE *replp;
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if (outlen < Py_UNICODE_SIZE)
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RESIZE_OUTBUFFER(
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errno == EINVAL || Py_UNICODE_SIZE > estep
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? Py_UNICODE_SIZE : estep);
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/* some compilers hate casted lvalue */
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replp = (Py_UNICODE *)out;
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assert((long)replp % Py_UNICODE_SIZE == 0);/* aligned? */
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*replp = REPLACEMENT_CHAR_DECODE;
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out += Py_UNICODE_SIZE;
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outlen -= Py_UNICODE_SIZE;
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}
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if (errno == EINVAL) break;
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else continue;
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}
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errpos = (int)(inp - inp_top);
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reasonpos += sprintf(reason, "Invalid multibyte sequence \\x%02x",
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(unsigned char)*inp);
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if (inplen > 1) {
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reasonpos += sprintf(reasonpos,
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"\\x%02x", (unsigned char)*(inp+1));
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if (inplen > 2)
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sprintf(reasonpos, "\\x%02x", (unsigned char)*(inp+2));
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}
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if (exceptionobj == NULL) {
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exceptionobj = PyUnicodeDecodeError_Create(
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self->encoding, inp_top, inplen_total,
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errpos, errpos + 1, reason);
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if (exceptionobj == NULL)
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goto errorexit;
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} else {
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if (PyUnicodeDecodeError_SetStart(exceptionobj, errpos) != 0)
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goto errorexit;
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if (PyUnicodeDecodeError_SetEnd(exceptionobj, errpos + 1) != 0)
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goto errorexit;
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if (PyUnicodeDecodeError_SetReason(exceptionobj, reason) != 0)
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goto errorexit;
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}
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if (errorcb == ERROR_STRICT) {
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PyCodec_StrictErrors(exceptionobj);
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goto errorexit;
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} else {
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PyObject *argsobj, *retobj, *retuni;
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long newpos;
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argsobj = PyTuple_New(1);
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if (argsobj == NULL)
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goto errorexit;
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PyTuple_SET_ITEM(argsobj, 0, exceptionobj);
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Py_INCREF(exceptionobj);
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retobj = PyObject_CallObject(errorcb, argsobj);
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Py_DECREF(argsobj);
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if (retobj == NULL)
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goto errorexit;
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if (!PyTuple_Check(retobj) || PyTuple_GET_SIZE(retobj) != 2 ||
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!PyUnicode_Check((retuni = PyTuple_GET_ITEM(retobj, 0))) ||
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!PyInt_Check(PyTuple_GET_ITEM(retobj, 1))) {
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Py_DECREF(retobj);
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PyErr_SetString(PyExc_ValueError, "decoding error handler "
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"must return (unicode, int) tuple");
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goto errorexit;
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}
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if (PyUnicode_GET_SIZE(retuni) > 0) {
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#define errorexit errorexit_cbpad
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size_t retunisize;
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retunisize = PyUnicode_GET_DATA_SIZE(retuni);
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if (outlen < retunisize)
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RESIZE_OUTBUFFER(errno == EINVAL || retunisize > estep
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? retunisize - outlen : estep);
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memcpy(out, PyUnicode_AS_DATA(retuni), retunisize);
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out += retunisize;
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outlen -= retunisize;
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#undef errorexit
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if (0) {
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errorexit_cbpad: Py_DECREF(retobj);
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goto errorexit;
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}
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}
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newpos = PyInt_AS_LONG(PyTuple_GET_ITEM(retobj, 1));
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Py_DECREF(retobj);
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if (newpos < 0)
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newpos = inplen_total - newpos;
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if (newpos < 0 || newpos >= inplen_total)
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break;
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inp = inp_top + newpos;
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inplen = inplen_total - newpos;
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}
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} else
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break;
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}
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#undef RESIZE_OUTBUFFER
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{
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PyObject *rettup;
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int finalsize;
|
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finalsize = (int)(out - out_top);
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if (finalsize != outlen_total) {
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if (PyUnicode_Resize(&outputobj, finalsize / Py_UNICODE_SIZE) == -1)
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goto errorexit;
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}
|
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|
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if (errorcb > ERROR_MAX) {
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Py_DECREF(errorcb);
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}
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Py_XDECREF(exceptionobj);
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|
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rettup = PyTuple_New(2);
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|
if (rettup == NULL) {
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Py_DECREF(outputobj);
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return NULL;
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}
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PyTuple_SET_ITEM(rettup, 0, outputobj);
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PyTuple_SET_ITEM(rettup, 1, PyInt_FromLong(inplen_total));
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return rettup;
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}
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errorexit:
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Py_XDECREF(outputobj);
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if (errorcb > ERROR_MAX) {
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Py_DECREF(errorcb);
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}
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Py_XDECREF(exceptionobj);
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return NULL;
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}
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|
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static struct PyMethodDef iconvcodec_methods[] = {
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{"encode", (PyCFunction)iconvcodec_encode,
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METH_VARARGS | METH_KEYWORDS,
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iconvcodec_encode__doc__},
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{"decode", (PyCFunction)iconvcodec_decode,
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METH_VARARGS | METH_KEYWORDS,
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iconvcodec_decode__doc__},
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{NULL, NULL},
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};
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static PyObject *
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iconvcodec_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
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{
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PyObject *encobj = NULL;
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iconvcodecObject *new = NULL;
|
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new = (iconvcodecObject *)type->tp_alloc(type, 0);
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if (new == NULL)
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return NULL;
|
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new->encoding = NULL;
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new->enchdl = new->dechdl = (iconv_t)(-1);
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encobj = PyObject_GetAttrString((PyObject *)new, "encoding");
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if (encobj == NULL) {
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PyErr_Clear();
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new->encoding = PyMem_Malloc(sizeof(DEFAULT_ENCODING));
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strcpy(new->encoding, DEFAULT_ENCODING);
|
|
} else if (!PyString_Check(encobj)) {
|
|
Py_DECREF(encobj);
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"`encoding' attribute must be a string.");
|
|
goto errorexit;
|
|
} else {
|
|
new->encoding = PyMem_Malloc(PyString_GET_SIZE(encobj) + 1);
|
|
strcpy(new->encoding, PyString_AS_STRING(encobj));
|
|
Py_DECREF(encobj);
|
|
}
|
|
|
|
new->dechdl = iconv_open(UNICODE_ENCODING, new->encoding);
|
|
if (new->dechdl == (iconv_t)(-1)) {
|
|
PyErr_SetString(PyExc_ValueError, "unsupported decoding");
|
|
goto errorexit;
|
|
}
|
|
|
|
new->enchdl = iconv_open(new->encoding, UNICODE_ENCODING);
|
|
if (new->enchdl == (iconv_t)(-1)) {
|
|
PyErr_SetString(PyExc_ValueError, "unsupported encoding");
|
|
iconv_close(new->dechdl);
|
|
new->dechdl = (iconv_t)(-1);
|
|
goto errorexit;
|
|
}
|
|
|
|
return (PyObject *)new;
|
|
|
|
errorexit:
|
|
Py_XDECREF(new);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
iconvcodec_dealloc(iconvcodecObject *self)
|
|
{
|
|
if (self->enchdl != (iconv_t)-1)
|
|
iconv_close(self->enchdl);
|
|
if (self->dechdl != (iconv_t)-1)
|
|
iconv_close(self->dechdl);
|
|
if (self->encoding != NULL)
|
|
PyMem_Free(self->encoding);
|
|
|
|
self->ob_type->tp_free((PyObject *)self);
|
|
}
|
|
|
|
static PyObject *
|
|
iconvcodec_repr(PyObject *self)
|
|
{
|
|
return PyString_FromFormat("<iconvcodec encoding='%s'>",
|
|
((iconvcodecObject *)self)->encoding);
|
|
}
|
|
|
|
statichere PyTypeObject iconvcodec_Type = {
|
|
PyObject_HEAD_INIT(&PyType_Type)
|
|
0, /* Number of items for varobject */
|
|
"iconvcodec", /* Name of this type */
|
|
sizeof(iconvcodecObject), /* Basic object size */
|
|
0, /* Item size for varobject */
|
|
(destructor)iconvcodec_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_compare */
|
|
iconvcodec_repr, /* 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_BASETYPE, /* tp_flags */
|
|
iconvcodec_doc, /* tp_doc */
|
|
0, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
0, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iterext */
|
|
iconvcodec_methods, /* tp_methods */
|
|
0, /* tp_members */
|
|
0, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
0, /* tp_descr_get */
|
|
0, /* tp_descr_set */
|
|
0, /* tp_dictoffset */
|
|
0, /* tp_init */
|
|
PyType_GenericAlloc, /* tp_alloc */
|
|
iconvcodec_new, /* tp_new */
|
|
PyObject_Del, /* tp_free */
|
|
};
|
|
|
|
static struct PyMethodDef _iconv_codec_methods[] = {
|
|
{NULL, NULL},
|
|
};
|
|
|
|
void
|
|
init_iconv_codec(void)
|
|
{
|
|
PyObject *m;
|
|
|
|
m = Py_InitModule("_iconv_codec", _iconv_codec_methods);
|
|
|
|
PyModule_AddStringConstant(m, "__version__", (char*)__version__);
|
|
Py_INCREF(&iconvcodec_Type);
|
|
PyModule_AddObject(m, "iconvcodec", (PyObject *)(&iconvcodec_Type));
|
|
PyModule_AddStringConstant(m, "internal_encoding", UNICODE_ENCODING);
|
|
|
|
if (PyErr_Occurred())
|
|
Py_FatalError("can't initialize the _iconv_codec module");
|
|
}
|
|
|
|
/*
|
|
* ex: ts=8 sts=4 et
|
|
* $Id$
|
|
*/
|