851 lines
19 KiB
C
851 lines
19 KiB
C
/* ------------------------------------------------------------------------
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Python Codec Registry and support functions
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Written by Marc-Andre Lemburg (mal@lemburg.com).
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Copyright (c) Corporation for National Research Initiatives.
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------------------------------------------------------------------------ */
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#include "Python.h"
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#include <ctype.h>
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/* --- Globals ------------------------------------------------------------ */
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static PyObject *_PyCodec_SearchPath;
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static PyObject *_PyCodec_SearchCache;
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/* Flag used for lazy import of the standard encodings package */
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static int import_encodings_called = 0;
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/* --- Codec Registry ----------------------------------------------------- */
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/* Import the standard encodings package which will register the first
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codec search function.
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This is done in a lazy way so that the Unicode implementation does
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not downgrade startup time of scripts not needing it.
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ImportErrors are silently ignored by this function. Only one try is
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made.
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*/
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static
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int import_encodings(void)
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{
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PyObject *mod;
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import_encodings_called = 1;
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mod = PyImport_ImportModuleEx("encodings", NULL, NULL, NULL);
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if (mod == NULL) {
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if (PyErr_ExceptionMatches(PyExc_ImportError)) {
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/* Ignore ImportErrors... this is done so that
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distributions can disable the encodings package. Note
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that other errors are not masked, e.g. SystemErrors
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raised to inform the user of an error in the Python
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configuration are still reported back to the user. */
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PyErr_Clear();
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return 0;
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}
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return -1;
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}
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Py_DECREF(mod);
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return 0;
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}
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int PyCodec_Register(PyObject *search_function)
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{
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if (!import_encodings_called) {
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if (import_encodings())
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goto onError;
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}
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if (search_function == NULL) {
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PyErr_BadArgument();
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goto onError;
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}
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if (!PyCallable_Check(search_function)) {
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PyErr_SetString(PyExc_TypeError,
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"argument must be callable");
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goto onError;
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}
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return PyList_Append(_PyCodec_SearchPath, search_function);
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onError:
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return -1;
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}
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/* Convert a string to a normalized Python string: all characters are
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converted to lower case, spaces are replaced with underscores. */
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static
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PyObject *normalizestring(const char *string)
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{
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register size_t i;
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size_t len = strlen(string);
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char *p;
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PyObject *v;
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if (len > INT_MAX) {
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PyErr_SetString(PyExc_OverflowError, "string is too large");
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return NULL;
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}
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v = PyString_FromStringAndSize(NULL, (int)len);
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if (v == NULL)
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return NULL;
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p = PyString_AS_STRING(v);
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for (i = 0; i < len; i++) {
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register char ch = string[i];
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if (ch == ' ')
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ch = '-';
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else
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ch = tolower(ch);
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p[i] = ch;
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}
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return v;
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}
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/* Lookup the given encoding and return a tuple providing the codec
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facilities.
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The encoding string is looked up converted to all lower-case
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characters. This makes encodings looked up through this mechanism
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effectively case-insensitive.
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If no codec is found, a LookupError is set and NULL returned.
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As side effect, this tries to load the encodings package, if not
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yet done. This is part of the lazy load strategy for the encodings
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package.
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*/
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PyObject *_PyCodec_Lookup(const char *encoding)
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{
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PyObject *result, *args = NULL, *v;
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int i, len;
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if (encoding == NULL) {
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PyErr_BadArgument();
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goto onError;
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}
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if (_PyCodec_SearchCache == NULL ||
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_PyCodec_SearchPath == NULL) {
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PyErr_SetString(PyExc_SystemError,
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"codec module not properly initialized");
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goto onError;
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}
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if (!import_encodings_called) {
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if (import_encodings())
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goto onError;
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}
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/* Convert the encoding to a normalized Python string: all
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characters are converted to lower case, spaces and hyphens are
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replaced with underscores. */
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v = normalizestring(encoding);
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if (v == NULL)
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goto onError;
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PyString_InternInPlace(&v);
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/* First, try to lookup the name in the registry dictionary */
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result = PyDict_GetItem(_PyCodec_SearchCache, v);
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if (result != NULL) {
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Py_INCREF(result);
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Py_DECREF(v);
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return result;
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}
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/* Next, scan the search functions in order of registration */
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args = PyTuple_New(1);
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if (args == NULL)
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goto onError;
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PyTuple_SET_ITEM(args,0,v);
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len = PyList_Size(_PyCodec_SearchPath);
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if (len < 0)
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goto onError;
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if (len == 0) {
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PyErr_SetString(PyExc_LookupError,
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"no codec search functions registered: "
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"can't find encoding");
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goto onError;
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}
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for (i = 0; i < len; i++) {
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PyObject *func;
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func = PyList_GetItem(_PyCodec_SearchPath, i);
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if (func == NULL)
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goto onError;
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result = PyEval_CallObject(func, args);
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if (result == NULL)
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goto onError;
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if (result == Py_None) {
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Py_DECREF(result);
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continue;
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}
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if (!PyTuple_Check(result) || PyTuple_GET_SIZE(result) != 4) {
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PyErr_SetString(PyExc_TypeError,
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"codec search functions must return 4-tuples");
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Py_DECREF(result);
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goto onError;
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}
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break;
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}
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if (i == len) {
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/* XXX Perhaps we should cache misses too ? */
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PyErr_Format(PyExc_LookupError,
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"unknown encoding: %s", encoding);
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goto onError;
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}
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/* Cache and return the result */
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PyDict_SetItem(_PyCodec_SearchCache, v, result);
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Py_DECREF(args);
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return result;
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onError:
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Py_XDECREF(args);
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return NULL;
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}
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static
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PyObject *args_tuple(PyObject *object,
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const char *errors)
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{
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PyObject *args;
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args = PyTuple_New(1 + (errors != NULL));
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if (args == NULL)
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return NULL;
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Py_INCREF(object);
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PyTuple_SET_ITEM(args,0,object);
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if (errors) {
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PyObject *v;
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v = PyString_FromString(errors);
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if (v == NULL) {
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Py_DECREF(args);
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return NULL;
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}
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PyTuple_SET_ITEM(args, 1, v);
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}
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return args;
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}
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/* Build a codec by calling factory(stream[,errors]) or just
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factory(errors) depending on whether the given parameters are
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non-NULL. */
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static
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PyObject *build_stream_codec(PyObject *factory,
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PyObject *stream,
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const char *errors)
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{
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PyObject *args, *codec;
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args = args_tuple(stream, errors);
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if (args == NULL)
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return NULL;
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codec = PyEval_CallObject(factory, args);
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Py_DECREF(args);
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return codec;
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}
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/* Convenience APIs to query the Codec registry.
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All APIs return a codec object with incremented refcount.
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*/
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PyObject *PyCodec_Encoder(const char *encoding)
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{
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PyObject *codecs;
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PyObject *v;
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codecs = _PyCodec_Lookup(encoding);
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if (codecs == NULL)
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goto onError;
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v = PyTuple_GET_ITEM(codecs,0);
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Py_DECREF(codecs);
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Py_INCREF(v);
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return v;
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onError:
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return NULL;
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}
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PyObject *PyCodec_Decoder(const char *encoding)
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{
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PyObject *codecs;
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PyObject *v;
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codecs = _PyCodec_Lookup(encoding);
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if (codecs == NULL)
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goto onError;
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v = PyTuple_GET_ITEM(codecs,1);
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Py_DECREF(codecs);
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Py_INCREF(v);
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return v;
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onError:
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return NULL;
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}
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PyObject *PyCodec_StreamReader(const char *encoding,
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PyObject *stream,
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const char *errors)
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{
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PyObject *codecs, *ret;
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codecs = _PyCodec_Lookup(encoding);
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if (codecs == NULL)
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goto onError;
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ret = build_stream_codec(PyTuple_GET_ITEM(codecs,2),stream,errors);
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Py_DECREF(codecs);
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return ret;
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onError:
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return NULL;
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}
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PyObject *PyCodec_StreamWriter(const char *encoding,
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PyObject *stream,
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const char *errors)
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{
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PyObject *codecs, *ret;
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codecs = _PyCodec_Lookup(encoding);
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if (codecs == NULL)
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goto onError;
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ret = build_stream_codec(PyTuple_GET_ITEM(codecs,3),stream,errors);
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Py_DECREF(codecs);
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return ret;
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onError:
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return NULL;
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}
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/* Encode an object (e.g. an Unicode object) using the given encoding
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and return the resulting encoded object (usually a Python string).
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errors is passed to the encoder factory as argument if non-NULL. */
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PyObject *PyCodec_Encode(PyObject *object,
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const char *encoding,
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const char *errors)
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{
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PyObject *encoder = NULL;
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PyObject *args = NULL, *result;
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PyObject *v;
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encoder = PyCodec_Encoder(encoding);
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if (encoder == NULL)
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goto onError;
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args = args_tuple(object, errors);
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if (args == NULL)
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goto onError;
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result = PyEval_CallObject(encoder,args);
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if (result == NULL)
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goto onError;
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if (!PyTuple_Check(result) ||
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PyTuple_GET_SIZE(result) != 2) {
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PyErr_SetString(PyExc_TypeError,
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"encoder must return a tuple (object,integer)");
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goto onError;
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}
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v = PyTuple_GET_ITEM(result,0);
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Py_INCREF(v);
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/* We don't check or use the second (integer) entry. */
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Py_DECREF(args);
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Py_DECREF(encoder);
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Py_DECREF(result);
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return v;
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onError:
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Py_XDECREF(args);
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Py_XDECREF(encoder);
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return NULL;
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}
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/* Decode an object (usually a Python string) using the given encoding
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and return an equivalent object (e.g. an Unicode object).
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errors is passed to the decoder factory as argument if non-NULL. */
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PyObject *PyCodec_Decode(PyObject *object,
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const char *encoding,
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const char *errors)
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{
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PyObject *decoder = NULL;
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PyObject *args = NULL, *result = NULL;
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PyObject *v;
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decoder = PyCodec_Decoder(encoding);
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if (decoder == NULL)
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goto onError;
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args = args_tuple(object, errors);
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if (args == NULL)
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goto onError;
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result = PyEval_CallObject(decoder,args);
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if (result == NULL)
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goto onError;
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if (!PyTuple_Check(result) ||
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PyTuple_GET_SIZE(result) != 2) {
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PyErr_SetString(PyExc_TypeError,
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"decoder must return a tuple (object,integer)");
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goto onError;
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}
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v = PyTuple_GET_ITEM(result,0);
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Py_INCREF(v);
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/* We don't check or use the second (integer) entry. */
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Py_DECREF(args);
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Py_DECREF(decoder);
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Py_DECREF(result);
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return v;
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onError:
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Py_XDECREF(args);
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Py_XDECREF(decoder);
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Py_XDECREF(result);
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return NULL;
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}
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static PyObject *_PyCodec_ErrorRegistry;
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/* Register the error handling callback function error under the name
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name. This function will be called by the codec when it encounters
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an unencodable characters/undecodable bytes and doesn't know the
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callback name, when name is specified as the error parameter
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in the call to the encode/decode function.
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Return 0 on success, -1 on error */
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int PyCodec_RegisterError(const char *name, PyObject *error)
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{
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if (!PyCallable_Check(error)) {
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PyErr_SetString(PyExc_TypeError, "handler must be callable");
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return -1;
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}
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return PyDict_SetItemString( _PyCodec_ErrorRegistry, (char *)name, error);
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}
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/* Lookup the error handling callback function registered under the
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name error. As a special case NULL can be passed, in which case
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the error handling callback for strict encoding will be returned. */
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PyObject *PyCodec_LookupError(const char *name)
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{
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PyObject *handler = NULL;
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if (name==NULL)
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name = "strict";
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handler = PyDict_GetItemString(_PyCodec_ErrorRegistry, (char *)name);
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if (!handler)
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PyErr_Format(PyExc_LookupError, "unknown error handler name '%.400s'", name);
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else
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Py_INCREF(handler);
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return handler;
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}
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static void wrong_exception_type(PyObject *exc)
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{
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PyObject *type = PyObject_GetAttrString(exc, "__class__");
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if (type != NULL) {
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PyObject *name = PyObject_GetAttrString(type, "__name__");
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Py_DECREF(type);
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if (name != NULL) {
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PyObject *string = PyObject_Str(name);
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Py_DECREF(name);
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if (string != NULL) {
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PyErr_Format(PyExc_TypeError,
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"don't know how to handle %.400s in error callback",
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PyString_AS_STRING(string));
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Py_DECREF(string);
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}
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}
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}
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}
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PyObject *PyCodec_StrictErrors(PyObject *exc)
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{
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if (PyInstance_Check(exc))
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PyErr_SetObject((PyObject*)((PyInstanceObject*)exc)->in_class,
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exc);
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else
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PyErr_SetString(PyExc_TypeError, "codec must pass exception instance");
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return NULL;
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}
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#ifdef Py_USING_UNICODE
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PyObject *PyCodec_IgnoreErrors(PyObject *exc)
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{
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int end;
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if (PyObject_IsInstance(exc, PyExc_UnicodeEncodeError)) {
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if (PyUnicodeEncodeError_GetEnd(exc, &end))
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return NULL;
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}
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else if (PyObject_IsInstance(exc, PyExc_UnicodeDecodeError)) {
|
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if (PyUnicodeDecodeError_GetEnd(exc, &end))
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return NULL;
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}
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else if (PyObject_IsInstance(exc, PyExc_UnicodeTranslateError)) {
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if (PyUnicodeTranslateError_GetEnd(exc, &end))
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return NULL;
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}
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else {
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wrong_exception_type(exc);
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return NULL;
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}
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/* ouch: passing NULL, 0, pos gives None instead of u'' */
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return Py_BuildValue("(u#i)", &end, 0, end);
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}
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PyObject *PyCodec_ReplaceErrors(PyObject *exc)
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{
|
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PyObject *restuple;
|
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int start;
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int end;
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int i;
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|
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if (PyObject_IsInstance(exc, PyExc_UnicodeEncodeError)) {
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PyObject *res;
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Py_UNICODE *p;
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if (PyUnicodeEncodeError_GetStart(exc, &start))
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return NULL;
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if (PyUnicodeEncodeError_GetEnd(exc, &end))
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return NULL;
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res = PyUnicode_FromUnicode(NULL, end-start);
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if (res == NULL)
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return NULL;
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for (p = PyUnicode_AS_UNICODE(res), i = start;
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i<end; ++p, ++i)
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*p = '?';
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restuple = Py_BuildValue("(Oi)", res, end);
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Py_DECREF(res);
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return restuple;
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}
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else if (PyObject_IsInstance(exc, PyExc_UnicodeDecodeError)) {
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Py_UNICODE res = Py_UNICODE_REPLACEMENT_CHARACTER;
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if (PyUnicodeDecodeError_GetEnd(exc, &end))
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return NULL;
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return Py_BuildValue("(u#i)", &res, 1, end);
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}
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else if (PyObject_IsInstance(exc, PyExc_UnicodeTranslateError)) {
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PyObject *res;
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Py_UNICODE *p;
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if (PyUnicodeTranslateError_GetStart(exc, &start))
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return NULL;
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if (PyUnicodeTranslateError_GetEnd(exc, &end))
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return NULL;
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res = PyUnicode_FromUnicode(NULL, end-start);
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if (res == NULL)
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return NULL;
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for (p = PyUnicode_AS_UNICODE(res), i = start;
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i<end; ++p, ++i)
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*p = Py_UNICODE_REPLACEMENT_CHARACTER;
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restuple = Py_BuildValue("(Oi)", res, end);
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Py_DECREF(res);
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return restuple;
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}
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else {
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wrong_exception_type(exc);
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return NULL;
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}
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}
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PyObject *PyCodec_XMLCharRefReplaceErrors(PyObject *exc)
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|
{
|
|
if (PyObject_IsInstance(exc, PyExc_UnicodeEncodeError)) {
|
|
PyObject *restuple;
|
|
PyObject *object;
|
|
int start;
|
|
int end;
|
|
PyObject *res;
|
|
Py_UNICODE *p;
|
|
Py_UNICODE *startp;
|
|
Py_UNICODE *outp;
|
|
int ressize;
|
|
if (PyUnicodeEncodeError_GetStart(exc, &start))
|
|
return NULL;
|
|
if (PyUnicodeEncodeError_GetEnd(exc, &end))
|
|
return NULL;
|
|
if (!(object = PyUnicodeEncodeError_GetObject(exc)))
|
|
return NULL;
|
|
startp = PyUnicode_AS_UNICODE(object);
|
|
for (p = startp+start, ressize = 0; p < startp+end; ++p) {
|
|
if (*p<10)
|
|
ressize += 2+1+1;
|
|
else if (*p<100)
|
|
ressize += 2+2+1;
|
|
else if (*p<1000)
|
|
ressize += 2+3+1;
|
|
else if (*p<10000)
|
|
ressize += 2+4+1;
|
|
else if (*p<100000)
|
|
ressize += 2+5+1;
|
|
else if (*p<1000000)
|
|
ressize += 2+6+1;
|
|
else
|
|
ressize += 2+7+1;
|
|
}
|
|
/* allocate replacement */
|
|
res = PyUnicode_FromUnicode(NULL, ressize);
|
|
if (res == NULL) {
|
|
Py_DECREF(object);
|
|
return NULL;
|
|
}
|
|
/* generate replacement */
|
|
for (p = startp+start, outp = PyUnicode_AS_UNICODE(res);
|
|
p < startp+end; ++p) {
|
|
Py_UNICODE c = *p;
|
|
int digits;
|
|
int base;
|
|
*outp++ = '&';
|
|
*outp++ = '#';
|
|
if (*p<10) {
|
|
digits = 1;
|
|
base = 1;
|
|
}
|
|
else if (*p<100) {
|
|
digits = 2;
|
|
base = 10;
|
|
}
|
|
else if (*p<1000) {
|
|
digits = 3;
|
|
base = 100;
|
|
}
|
|
else if (*p<10000) {
|
|
digits = 4;
|
|
base = 1000;
|
|
}
|
|
else if (*p<100000) {
|
|
digits = 5;
|
|
base = 10000;
|
|
}
|
|
else if (*p<1000000) {
|
|
digits = 6;
|
|
base = 100000;
|
|
}
|
|
else {
|
|
digits = 7;
|
|
base = 1000000;
|
|
}
|
|
while (digits-->0) {
|
|
*outp++ = '0' + c/base;
|
|
c %= base;
|
|
base /= 10;
|
|
}
|
|
*outp++ = ';';
|
|
}
|
|
restuple = Py_BuildValue("(Oi)", res, end);
|
|
Py_DECREF(res);
|
|
Py_DECREF(object);
|
|
return restuple;
|
|
}
|
|
else {
|
|
wrong_exception_type(exc);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
static Py_UNICODE hexdigits[] = {
|
|
'0', '1', '2', '3', '4', '5', '6', '7',
|
|
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
|
|
};
|
|
|
|
PyObject *PyCodec_BackslashReplaceErrors(PyObject *exc)
|
|
{
|
|
if (PyObject_IsInstance(exc, PyExc_UnicodeEncodeError)) {
|
|
PyObject *restuple;
|
|
PyObject *object;
|
|
int start;
|
|
int end;
|
|
PyObject *res;
|
|
Py_UNICODE *p;
|
|
Py_UNICODE *startp;
|
|
Py_UNICODE *outp;
|
|
int ressize;
|
|
if (PyUnicodeEncodeError_GetStart(exc, &start))
|
|
return NULL;
|
|
if (PyUnicodeEncodeError_GetEnd(exc, &end))
|
|
return NULL;
|
|
if (!(object = PyUnicodeEncodeError_GetObject(exc)))
|
|
return NULL;
|
|
startp = PyUnicode_AS_UNICODE(object);
|
|
for (p = startp+start, ressize = 0; p < startp+end; ++p) {
|
|
if (*p >= 0x00010000)
|
|
ressize += 1+1+8;
|
|
else if (*p >= 0x100) {
|
|
ressize += 1+1+4;
|
|
}
|
|
else
|
|
ressize += 1+1+2;
|
|
}
|
|
res = PyUnicode_FromUnicode(NULL, ressize);
|
|
if (res==NULL)
|
|
return NULL;
|
|
for (p = startp+start, outp = PyUnicode_AS_UNICODE(res);
|
|
p < startp+end; ++p) {
|
|
Py_UNICODE c = *p;
|
|
*outp++ = '\\';
|
|
if (c >= 0x00010000) {
|
|
*outp++ = 'U';
|
|
*outp++ = hexdigits[(c>>28)&0xf];
|
|
*outp++ = hexdigits[(c>>24)&0xf];
|
|
*outp++ = hexdigits[(c>>20)&0xf];
|
|
*outp++ = hexdigits[(c>>16)&0xf];
|
|
*outp++ = hexdigits[(c>>12)&0xf];
|
|
*outp++ = hexdigits[(c>>8)&0xf];
|
|
}
|
|
else if (c >= 0x100) {
|
|
*outp++ = 'u';
|
|
*outp++ = hexdigits[(c>>12)&0xf];
|
|
*outp++ = hexdigits[(c>>8)&0xf];
|
|
}
|
|
else
|
|
*outp++ = 'x';
|
|
*outp++ = hexdigits[(c>>4)&0xf];
|
|
*outp++ = hexdigits[c&0xf];
|
|
}
|
|
|
|
restuple = Py_BuildValue("(Oi)", res, end);
|
|
Py_DECREF(res);
|
|
Py_DECREF(object);
|
|
return restuple;
|
|
}
|
|
else {
|
|
wrong_exception_type(exc);
|
|
return NULL;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static PyObject *strict_errors(PyObject *self, PyObject *exc)
|
|
{
|
|
return PyCodec_StrictErrors(exc);
|
|
}
|
|
|
|
|
|
#ifdef Py_USING_UNICODE
|
|
static PyObject *ignore_errors(PyObject *self, PyObject *exc)
|
|
{
|
|
return PyCodec_IgnoreErrors(exc);
|
|
}
|
|
|
|
|
|
static PyObject *replace_errors(PyObject *self, PyObject *exc)
|
|
{
|
|
return PyCodec_ReplaceErrors(exc);
|
|
}
|
|
|
|
|
|
static PyObject *xmlcharrefreplace_errors(PyObject *self, PyObject *exc)
|
|
{
|
|
return PyCodec_XMLCharRefReplaceErrors(exc);
|
|
}
|
|
|
|
|
|
static PyObject *backslashreplace_errors(PyObject *self, PyObject *exc)
|
|
{
|
|
return PyCodec_BackslashReplaceErrors(exc);
|
|
}
|
|
#endif
|
|
|
|
|
|
void _PyCodecRegistry_Init(void)
|
|
{
|
|
static struct {
|
|
char *name;
|
|
PyMethodDef def;
|
|
} methods[] =
|
|
{
|
|
{
|
|
"strict",
|
|
{
|
|
"strict_errors",
|
|
strict_errors,
|
|
METH_O
|
|
}
|
|
},
|
|
#ifdef Py_USING_UNICODE
|
|
{
|
|
"ignore",
|
|
{
|
|
"ignore_errors",
|
|
ignore_errors,
|
|
METH_O
|
|
}
|
|
},
|
|
{
|
|
"replace",
|
|
{
|
|
"replace_errors",
|
|
replace_errors,
|
|
METH_O
|
|
}
|
|
},
|
|
{
|
|
"xmlcharrefreplace",
|
|
{
|
|
"xmlcharrefreplace_errors",
|
|
xmlcharrefreplace_errors,
|
|
METH_O
|
|
}
|
|
},
|
|
{
|
|
"backslashreplace",
|
|
{
|
|
"backslashreplace_errors",
|
|
backslashreplace_errors,
|
|
METH_O
|
|
}
|
|
}
|
|
#endif
|
|
};
|
|
if (_PyCodec_SearchPath == NULL)
|
|
_PyCodec_SearchPath = PyList_New(0);
|
|
if (_PyCodec_SearchCache == NULL)
|
|
_PyCodec_SearchCache = PyDict_New();
|
|
if (_PyCodec_ErrorRegistry == NULL) {
|
|
int i;
|
|
_PyCodec_ErrorRegistry = PyDict_New();
|
|
|
|
if (_PyCodec_ErrorRegistry) {
|
|
for (i = 0; i < sizeof(methods)/sizeof(methods[0]); ++i) {
|
|
PyObject *func = PyCFunction_New(&methods[i].def, NULL);
|
|
int res;
|
|
if (!func)
|
|
Py_FatalError("can't initialize codec error registry");
|
|
res = PyCodec_RegisterError(methods[i].name, func);
|
|
Py_DECREF(func);
|
|
if (res)
|
|
Py_FatalError("can't initialize codec error registry");
|
|
}
|
|
}
|
|
}
|
|
if (_PyCodec_SearchPath == NULL ||
|
|
_PyCodec_SearchCache == NULL)
|
|
Py_FatalError("can't initialize codec registry");
|
|
}
|
|
|
|
void _PyCodecRegistry_Fini(void)
|
|
{
|
|
Py_XDECREF(_PyCodec_SearchPath);
|
|
_PyCodec_SearchPath = NULL;
|
|
Py_XDECREF(_PyCodec_SearchCache);
|
|
_PyCodec_SearchCache = NULL;
|
|
Py_XDECREF(_PyCodec_ErrorRegistry);
|
|
_PyCodec_ErrorRegistry = NULL;
|
|
}
|