| /* | |
| An implementation of Text I/O as defined by PEP 3116 - "New I/O" | |
| Classes defined here: TextIOBase, IncrementalNewlineDecoder, TextIOWrapper. | |
| Written by Amaury Forgeot d'Arc and Antoine Pitrou | |
| */ | |
| #define PY_SSIZE_T_CLEAN | |
| #include "Python.h" | |
| #include "structmember.h" | |
| #include "_iomodule.h" | |
| /* TextIOBase */ | |
| PyDoc_STRVAR(textiobase_doc, | |
| "Base class for text I/O.\n" | |
| "\n" | |
| "This class provides a character and line based interface to stream\n" | |
| "I/O. There is no readinto method because Python's character strings\n" | |
| "are immutable. There is no public constructor.\n" | |
| ); | |
| static PyObject * | |
| _unsupported(const char *message) | |
| { | |
| PyErr_SetString(_PyIO_unsupported_operation, message); | |
| return NULL; | |
| } | |
| PyDoc_STRVAR(textiobase_detach_doc, | |
| "Separate the underlying buffer from the TextIOBase and return it.\n" | |
| "\n" | |
| "After the underlying buffer has been detached, the TextIO is in an\n" | |
| "unusable state.\n" | |
| ); | |
| static PyObject * | |
| textiobase_detach(PyObject *self) | |
| { | |
| return _unsupported("detach"); | |
| } | |
| PyDoc_STRVAR(textiobase_read_doc, | |
| "Read at most n characters from stream.\n" | |
| "\n" | |
| "Read from underlying buffer until we have n characters or we hit EOF.\n" | |
| "If n is negative or omitted, read until EOF.\n" | |
| ); | |
| static PyObject * | |
| textiobase_read(PyObject *self, PyObject *args) | |
| { | |
| return _unsupported("read"); | |
| } | |
| PyDoc_STRVAR(textiobase_readline_doc, | |
| "Read until newline or EOF.\n" | |
| "\n" | |
| "Returns an empty string if EOF is hit immediately.\n" | |
| ); | |
| static PyObject * | |
| textiobase_readline(PyObject *self, PyObject *args) | |
| { | |
| return _unsupported("readline"); | |
| } | |
| PyDoc_STRVAR(textiobase_write_doc, | |
| "Write string to stream.\n" | |
| "Returns the number of characters written (which is always equal to\n" | |
| "the length of the string).\n" | |
| ); | |
| static PyObject * | |
| textiobase_write(PyObject *self, PyObject *args) | |
| { | |
| return _unsupported("write"); | |
| } | |
| PyDoc_STRVAR(textiobase_encoding_doc, | |
| "Encoding of the text stream.\n" | |
| "\n" | |
| "Subclasses should override.\n" | |
| ); | |
| static PyObject * | |
| textiobase_encoding_get(PyObject *self, void *context) | |
| { | |
| Py_RETURN_NONE; | |
| } | |
| PyDoc_STRVAR(textiobase_newlines_doc, | |
| "Line endings translated so far.\n" | |
| "\n" | |
| "Only line endings translated during reading are considered.\n" | |
| "\n" | |
| "Subclasses should override.\n" | |
| ); | |
| static PyObject * | |
| textiobase_newlines_get(PyObject *self, void *context) | |
| { | |
| Py_RETURN_NONE; | |
| } | |
| PyDoc_STRVAR(textiobase_errors_doc, | |
| "The error setting of the decoder or encoder.\n" | |
| "\n" | |
| "Subclasses should override.\n" | |
| ); | |
| static PyObject * | |
| textiobase_errors_get(PyObject *self, void *context) | |
| { | |
| Py_RETURN_NONE; | |
| } | |
| static PyMethodDef textiobase_methods[] = { | |
| {"detach", (PyCFunction)textiobase_detach, METH_NOARGS, textiobase_detach_doc}, | |
| {"read", textiobase_read, METH_VARARGS, textiobase_read_doc}, | |
| {"readline", textiobase_readline, METH_VARARGS, textiobase_readline_doc}, | |
| {"write", textiobase_write, METH_VARARGS, textiobase_write_doc}, | |
| {NULL, NULL} | |
| }; | |
| static PyGetSetDef textiobase_getset[] = { | |
| {"encoding", (getter)textiobase_encoding_get, NULL, textiobase_encoding_doc}, | |
| {"newlines", (getter)textiobase_newlines_get, NULL, textiobase_newlines_doc}, | |
| {"errors", (getter)textiobase_errors_get, NULL, textiobase_errors_doc}, | |
| {NULL} | |
| }; | |
| PyTypeObject PyTextIOBase_Type = { | |
| PyVarObject_HEAD_INIT(NULL, 0) | |
| "_io._TextIOBase", /*tp_name*/ | |
| 0, /*tp_basicsize*/ | |
| 0, /*tp_itemsize*/ | |
| 0, /*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*/ | |
| 0, /*tp_getattro*/ | |
| 0, /*tp_setattro*/ | |
| 0, /*tp_as_buffer*/ | |
| Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/ | |
| textiobase_doc, /* tp_doc */ | |
| 0, /* tp_traverse */ | |
| 0, /* tp_clear */ | |
| 0, /* tp_richcompare */ | |
| 0, /* tp_weaklistoffset */ | |
| 0, /* tp_iter */ | |
| 0, /* tp_iternext */ | |
| textiobase_methods, /* tp_methods */ | |
| 0, /* tp_members */ | |
| textiobase_getset, /* tp_getset */ | |
| &PyIOBase_Type, /* tp_base */ | |
| 0, /* tp_dict */ | |
| 0, /* tp_descr_get */ | |
| 0, /* tp_descr_set */ | |
| 0, /* tp_dictoffset */ | |
| 0, /* tp_init */ | |
| 0, /* tp_alloc */ | |
| 0, /* tp_new */ | |
| }; | |
| /* IncrementalNewlineDecoder */ | |
| PyDoc_STRVAR(incrementalnewlinedecoder_doc, | |
| "Codec used when reading a file in universal newlines mode. It wraps\n" | |
| "another incremental decoder, translating \\r\\n and \\r into \\n. It also\n" | |
| "records the types of newlines encountered. When used with\n" | |
| "translate=False, it ensures that the newline sequence is returned in\n" | |
| "one piece. When used with decoder=None, it expects unicode strings as\n" | |
| "decode input and translates newlines without first invoking an external\n" | |
| "decoder.\n" | |
| ); | |
| typedef struct { | |
| PyObject_HEAD | |
| PyObject *decoder; | |
| PyObject *errors; | |
| signed int pendingcr: 1; | |
| signed int translate: 1; | |
| unsigned int seennl: 3; | |
| } nldecoder_object; | |
| static int | |
| incrementalnewlinedecoder_init(nldecoder_object *self, | |
| PyObject *args, PyObject *kwds) | |
| { | |
| PyObject *decoder; | |
| int translate; | |
| PyObject *errors = NULL; | |
| char *kwlist[] = {"decoder", "translate", "errors", NULL}; | |
| if (!PyArg_ParseTupleAndKeywords(args, kwds, "Oi|O:IncrementalNewlineDecoder", | |
| kwlist, &decoder, &translate, &errors)) | |
| return -1; | |
| self->decoder = decoder; | |
| Py_INCREF(decoder); | |
| if (errors == NULL) { | |
| self->errors = PyUnicode_FromString("strict"); | |
| if (self->errors == NULL) | |
| return -1; | |
| } | |
| else { | |
| Py_INCREF(errors); | |
| self->errors = errors; | |
| } | |
| self->translate = translate; | |
| self->seennl = 0; | |
| self->pendingcr = 0; | |
| return 0; | |
| } | |
| static void | |
| incrementalnewlinedecoder_dealloc(nldecoder_object *self) | |
| { | |
| Py_CLEAR(self->decoder); | |
| Py_CLEAR(self->errors); | |
| Py_TYPE(self)->tp_free((PyObject *)self); | |
| } | |
| #define SEEN_CR 1 | |
| #define SEEN_LF 2 | |
| #define SEEN_CRLF 4 | |
| #define SEEN_ALL (SEEN_CR | SEEN_LF | SEEN_CRLF) | |
| PyObject * | |
| _PyIncrementalNewlineDecoder_decode(PyObject *_self, | |
| PyObject *input, int final) | |
| { | |
| PyObject *output; | |
| Py_ssize_t output_len; | |
| nldecoder_object *self = (nldecoder_object *) _self; | |
| if (self->decoder == NULL) { | |
| PyErr_SetString(PyExc_ValueError, | |
| "IncrementalNewlineDecoder.__init__ not called"); | |
| return NULL; | |
| } | |
| /* decode input (with the eventual \r from a previous pass) */ | |
| if (self->decoder != Py_None) { | |
| output = PyObject_CallMethodObjArgs(self->decoder, | |
| _PyIO_str_decode, input, final ? Py_True : Py_False, NULL); | |
| } | |
| else { | |
| output = input; | |
| Py_INCREF(output); | |
| } | |
| if (output == NULL) | |
| return NULL; | |
| if (!PyUnicode_Check(output)) { | |
| PyErr_SetString(PyExc_TypeError, | |
| "decoder should return a string result"); | |
| goto error; | |
| } | |
| output_len = PyUnicode_GET_SIZE(output); | |
| if (self->pendingcr && (final || output_len > 0)) { | |
| Py_UNICODE *out; | |
| PyObject *modified = PyUnicode_FromUnicode(NULL, output_len + 1); | |
| if (modified == NULL) | |
| goto error; | |
| out = PyUnicode_AS_UNICODE(modified); | |
| out[0] = '\r'; | |
| memcpy(out + 1, PyUnicode_AS_UNICODE(output), | |
| output_len * sizeof(Py_UNICODE)); | |
| Py_DECREF(output); | |
| output = modified; | |
| self->pendingcr = 0; | |
| output_len++; | |
| } | |
| /* retain last \r even when not translating data: | |
| * then readline() is sure to get \r\n in one pass | |
| */ | |
| if (!final) { | |
| if (output_len > 0 | |
| && PyUnicode_AS_UNICODE(output)[output_len - 1] == '\r') { | |
| if (Py_REFCNT(output) == 1) { | |
| if (PyUnicode_Resize(&output, output_len - 1) < 0) | |
| goto error; | |
| } | |
| else { | |
| PyObject *modified = PyUnicode_FromUnicode( | |
| PyUnicode_AS_UNICODE(output), | |
| output_len - 1); | |
| if (modified == NULL) | |
| goto error; | |
| Py_DECREF(output); | |
| output = modified; | |
| } | |
| self->pendingcr = 1; | |
| } | |
| } | |
| /* Record which newlines are read and do newline translation if desired, | |
| all in one pass. */ | |
| { | |
| Py_UNICODE *in_str; | |
| Py_ssize_t len; | |
| int seennl = self->seennl; | |
| int only_lf = 0; | |
| in_str = PyUnicode_AS_UNICODE(output); | |
| len = PyUnicode_GET_SIZE(output); | |
| if (len == 0) | |
| return output; | |
| /* If, up to now, newlines are consistently \n, do a quick check | |
| for the \r *byte* with the libc's optimized memchr. | |
| */ | |
| if (seennl == SEEN_LF || seennl == 0) { | |
| only_lf = (memchr(in_str, '\r', len * sizeof(Py_UNICODE)) == NULL); | |
| } | |
| if (only_lf) { | |
| /* If not already seen, quick scan for a possible "\n" character. | |
| (there's nothing else to be done, even when in translation mode) | |
| */ | |
| if (seennl == 0 && | |
| memchr(in_str, '\n', len * sizeof(Py_UNICODE)) != NULL) { | |
| Py_UNICODE *s, *end; | |
| s = in_str; | |
| end = in_str + len; | |
| for (;;) { | |
| Py_UNICODE c; | |
| /* Fast loop for non-control characters */ | |
| while (*s > '\n') | |
| s++; | |
| c = *s++; | |
| if (c == '\n') { | |
| seennl |= SEEN_LF; | |
| break; | |
| } | |
| if (s > end) | |
| break; | |
| } | |
| } | |
| /* Finished: we have scanned for newlines, and none of them | |
| need translating */ | |
| } | |
| else if (!self->translate) { | |
| Py_UNICODE *s, *end; | |
| /* We have already seen all newline types, no need to scan again */ | |
| if (seennl == SEEN_ALL) | |
| goto endscan; | |
| s = in_str; | |
| end = in_str + len; | |
| for (;;) { | |
| Py_UNICODE c; | |
| /* Fast loop for non-control characters */ | |
| while (*s > '\r') | |
| s++; | |
| c = *s++; | |
| if (c == '\n') | |
| seennl |= SEEN_LF; | |
| else if (c == '\r') { | |
| if (*s == '\n') { | |
| seennl |= SEEN_CRLF; | |
| s++; | |
| } | |
| else | |
| seennl |= SEEN_CR; | |
| } | |
| if (s > end) | |
| break; | |
| if (seennl == SEEN_ALL) | |
| break; | |
| } | |
| endscan: | |
| ; | |
| } | |
| else { | |
| PyObject *translated = NULL; | |
| Py_UNICODE *out_str; | |
| Py_UNICODE *in, *out, *end; | |
| if (Py_REFCNT(output) != 1) { | |
| /* We could try to optimize this so that we only do a copy | |
| when there is something to translate. On the other hand, | |
| most decoders should only output non-shared strings, i.e. | |
| translation is done in place. */ | |
| translated = PyUnicode_FromUnicode(NULL, len); | |
| if (translated == NULL) | |
| goto error; | |
| assert(Py_REFCNT(translated) == 1); | |
| memcpy(PyUnicode_AS_UNICODE(translated), | |
| PyUnicode_AS_UNICODE(output), | |
| len * sizeof(Py_UNICODE)); | |
| } | |
| else { | |
| translated = output; | |
| } | |
| out_str = PyUnicode_AS_UNICODE(translated); | |
| in = in_str; | |
| out = out_str; | |
| end = in_str + len; | |
| for (;;) { | |
| Py_UNICODE c; | |
| /* Fast loop for non-control characters */ | |
| while ((c = *in++) > '\r') | |
| *out++ = c; | |
| if (c == '\n') { | |
| *out++ = c; | |
| seennl |= SEEN_LF; | |
| continue; | |
| } | |
| if (c == '\r') { | |
| if (*in == '\n') { | |
| in++; | |
| seennl |= SEEN_CRLF; | |
| } | |
| else | |
| seennl |= SEEN_CR; | |
| *out++ = '\n'; | |
| continue; | |
| } | |
| if (in > end) | |
| break; | |
| *out++ = c; | |
| } | |
| if (translated != output) { | |
| Py_DECREF(output); | |
| output = translated; | |
| } | |
| if (out - out_str != len) { | |
| if (PyUnicode_Resize(&output, out - out_str) < 0) | |
| goto error; | |
| } | |
| } | |
| self->seennl |= seennl; | |
| } | |
| return output; | |
| error: | |
| Py_DECREF(output); | |
| return NULL; | |
| } | |
| static PyObject * | |
| incrementalnewlinedecoder_decode(nldecoder_object *self, | |
| PyObject *args, PyObject *kwds) | |
| { | |
| char *kwlist[] = {"input", "final", NULL}; | |
| PyObject *input; | |
| int final = 0; | |
| if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|i:IncrementalNewlineDecoder", | |
| kwlist, &input, &final)) | |
| return NULL; | |
| return _PyIncrementalNewlineDecoder_decode((PyObject *) self, input, final); | |
| } | |
| static PyObject * | |
| incrementalnewlinedecoder_getstate(nldecoder_object *self, PyObject *args) | |
| { | |
| PyObject *buffer; | |
| unsigned PY_LONG_LONG flag; | |
| if (self->decoder != Py_None) { | |
| PyObject *state = PyObject_CallMethodObjArgs(self->decoder, | |
| _PyIO_str_getstate, NULL); | |
| if (state == NULL) | |
| return NULL; | |
| if (!PyArg_Parse(state, "(OK)", &buffer, &flag)) { | |
| Py_DECREF(state); | |
| return NULL; | |
| } | |
| Py_INCREF(buffer); | |
| Py_DECREF(state); | |
| } | |
| else { | |
| buffer = PyBytes_FromString(""); | |
| flag = 0; | |
| } | |
| flag <<= 1; | |
| if (self->pendingcr) | |
| flag |= 1; | |
| return Py_BuildValue("NK", buffer, flag); | |
| } | |
| static PyObject * | |
| incrementalnewlinedecoder_setstate(nldecoder_object *self, PyObject *state) | |
| { | |
| PyObject *buffer; | |
| unsigned PY_LONG_LONG flag; | |
| if (!PyArg_Parse(state, "(OK)", &buffer, &flag)) | |
| return NULL; | |
| self->pendingcr = (int) flag & 1; | |
| flag >>= 1; | |
| if (self->decoder != Py_None) | |
| return PyObject_CallMethod(self->decoder, | |
| "setstate", "((OK))", buffer, flag); | |
| else | |
| Py_RETURN_NONE; | |
| } | |
| static PyObject * | |
| incrementalnewlinedecoder_reset(nldecoder_object *self, PyObject *args) | |
| { | |
| self->seennl = 0; | |
| self->pendingcr = 0; | |
| if (self->decoder != Py_None) | |
| return PyObject_CallMethodObjArgs(self->decoder, _PyIO_str_reset, NULL); | |
| else | |
| Py_RETURN_NONE; | |
| } | |
| static PyObject * | |
| incrementalnewlinedecoder_newlines_get(nldecoder_object *self, void *context) | |
| { | |
| switch (self->seennl) { | |
| case SEEN_CR: | |
| return PyUnicode_FromString("\r"); | |
| case SEEN_LF: | |
| return PyUnicode_FromString("\n"); | |
| case SEEN_CRLF: | |
| return PyUnicode_FromString("\r\n"); | |
| case SEEN_CR | SEEN_LF: | |
| return Py_BuildValue("ss", "\r", "\n"); | |
| case SEEN_CR | SEEN_CRLF: | |
| return Py_BuildValue("ss", "\r", "\r\n"); | |
| case SEEN_LF | SEEN_CRLF: | |
| return Py_BuildValue("ss", "\n", "\r\n"); | |
| case SEEN_CR | SEEN_LF | SEEN_CRLF: | |
| return Py_BuildValue("sss", "\r", "\n", "\r\n"); | |
| default: | |
| Py_RETURN_NONE; | |
| } | |
| } | |
| static PyMethodDef incrementalnewlinedecoder_methods[] = { | |
| {"decode", (PyCFunction)incrementalnewlinedecoder_decode, METH_VARARGS|METH_KEYWORDS}, | |
| {"getstate", (PyCFunction)incrementalnewlinedecoder_getstate, METH_NOARGS}, | |
| {"setstate", (PyCFunction)incrementalnewlinedecoder_setstate, METH_O}, | |
| {"reset", (PyCFunction)incrementalnewlinedecoder_reset, METH_NOARGS}, | |
| {NULL} | |
| }; | |
| static PyGetSetDef incrementalnewlinedecoder_getset[] = { | |
| {"newlines", (getter)incrementalnewlinedecoder_newlines_get, NULL, NULL}, | |
| {NULL} | |
| }; | |
| PyTypeObject PyIncrementalNewlineDecoder_Type = { | |
| PyVarObject_HEAD_INIT(NULL, 0) | |
| "_io.IncrementalNewlineDecoder", /*tp_name*/ | |
| sizeof(nldecoder_object), /*tp_basicsize*/ | |
| 0, /*tp_itemsize*/ | |
| (destructor)incrementalnewlinedecoder_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*/ | |
| 0, /*tp_getattro*/ | |
| 0, /*tp_setattro*/ | |
| 0, /*tp_as_buffer*/ | |
| Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/ | |
| incrementalnewlinedecoder_doc, /* tp_doc */ | |
| 0, /* tp_traverse */ | |
| 0, /* tp_clear */ | |
| 0, /* tp_richcompare */ | |
| 0, /*tp_weaklistoffset*/ | |
| 0, /* tp_iter */ | |
| 0, /* tp_iternext */ | |
| incrementalnewlinedecoder_methods, /* tp_methods */ | |
| 0, /* tp_members */ | |
| incrementalnewlinedecoder_getset, /* tp_getset */ | |
| 0, /* tp_base */ | |
| 0, /* tp_dict */ | |
| 0, /* tp_descr_get */ | |
| 0, /* tp_descr_set */ | |
| 0, /* tp_dictoffset */ | |
| (initproc)incrementalnewlinedecoder_init, /* tp_init */ | |
| 0, /* tp_alloc */ | |
| PyType_GenericNew, /* tp_new */ | |
| }; | |
| /* TextIOWrapper */ | |
| PyDoc_STRVAR(textiowrapper_doc, | |
| "Character and line based layer over a BufferedIOBase object, buffer.\n" | |
| "\n" | |
| "encoding gives the name of the encoding that the stream will be\n" | |
| "decoded or encoded with. It defaults to locale.getpreferredencoding.\n" | |
| "\n" | |
| "errors determines the strictness of encoding and decoding (see the\n" | |
| "codecs.register) and defaults to \"strict\".\n" | |
| "\n" | |
| "newline can be None, '', '\\n', '\\r', or '\\r\\n'. It controls the\n" | |
| "handling of line endings. If it is None, universal newlines is\n" | |
| "enabled. With this enabled, on input, the lines endings '\\n', '\\r',\n" | |
| "or '\\r\\n' are translated to '\\n' before being returned to the\n" | |
| "caller. Conversely, on output, '\\n' is translated to the system\n" | |
| "default line seperator, os.linesep. If newline is any other of its\n" | |
| "legal values, that newline becomes the newline when the file is read\n" | |
| "and it is returned untranslated. On output, '\\n' is converted to the\n" | |
| "newline.\n" | |
| "\n" | |
| "If line_buffering is True, a call to flush is implied when a call to\n" | |
| "write contains a newline character." | |
| ); | |
| typedef PyObject * | |
| (*encodefunc_t)(PyObject *, PyObject *); | |
| typedef struct | |
| { | |
| PyObject_HEAD | |
| int ok; /* initialized? */ | |
| int detached; | |
| Py_ssize_t chunk_size; | |
| PyObject *buffer; | |
| PyObject *encoding; | |
| PyObject *encoder; | |
| PyObject *decoder; | |
| PyObject *readnl; | |
| PyObject *errors; | |
| const char *writenl; /* utf-8 encoded, NULL stands for \n */ | |
| char line_buffering; | |
| char readuniversal; | |
| char readtranslate; | |
| char writetranslate; | |
| char seekable; | |
| char telling; | |
| /* Specialized encoding func (see below) */ | |
| encodefunc_t encodefunc; | |
| /* Whether or not it's the start of the stream */ | |
| char encoding_start_of_stream; | |
| /* Reads and writes are internally buffered in order to speed things up. | |
| However, any read will first flush the write buffer if itsn't empty. | |
| Please also note that text to be written is first encoded before being | |
| buffered. This is necessary so that encoding errors are immediately | |
| reported to the caller, but it unfortunately means that the | |
| IncrementalEncoder (whose encode() method is always written in Python) | |
| becomes a bottleneck for small writes. | |
| */ | |
| PyObject *decoded_chars; /* buffer for text returned from decoder */ | |
| Py_ssize_t decoded_chars_used; /* offset into _decoded_chars for read() */ | |
| PyObject *pending_bytes; /* list of bytes objects waiting to be | |
| written, or NULL */ | |
| Py_ssize_t pending_bytes_count; | |
| PyObject *snapshot; | |
| /* snapshot is either None, or a tuple (dec_flags, next_input) where | |
| * dec_flags is the second (integer) item of the decoder state and | |
| * next_input is the chunk of input bytes that comes next after the | |
| * snapshot point. We use this to reconstruct decoder states in tell(). | |
| */ | |
| /* Cache raw object if it's a FileIO object */ | |
| PyObject *raw; | |
| PyObject *weakreflist; | |
| PyObject *dict; | |
| } textio; | |
| /* A couple of specialized cases in order to bypass the slow incremental | |
| encoding methods for the most popular encodings. */ | |
| static PyObject * | |
| ascii_encode(textio *self, PyObject *text) | |
| { | |
| return PyUnicode_EncodeASCII(PyUnicode_AS_UNICODE(text), | |
| PyUnicode_GET_SIZE(text), | |
| PyBytes_AS_STRING(self->errors)); | |
| } | |
| static PyObject * | |
| utf16be_encode(textio *self, PyObject *text) | |
| { | |
| return PyUnicode_EncodeUTF16(PyUnicode_AS_UNICODE(text), | |
| PyUnicode_GET_SIZE(text), | |
| PyBytes_AS_STRING(self->errors), 1); | |
| } | |
| static PyObject * | |
| utf16le_encode(textio *self, PyObject *text) | |
| { | |
| return PyUnicode_EncodeUTF16(PyUnicode_AS_UNICODE(text), | |
| PyUnicode_GET_SIZE(text), | |
| PyBytes_AS_STRING(self->errors), -1); | |
| } | |
| static PyObject * | |
| utf16_encode(textio *self, PyObject *text) | |
| { | |
| if (!self->encoding_start_of_stream) { | |
| /* Skip the BOM and use native byte ordering */ | |
| #if defined(WORDS_BIGENDIAN) | |
| return utf16be_encode(self, text); | |
| #else | |
| return utf16le_encode(self, text); | |
| #endif | |
| } | |
| return PyUnicode_EncodeUTF16(PyUnicode_AS_UNICODE(text), | |
| PyUnicode_GET_SIZE(text), | |
| PyBytes_AS_STRING(self->errors), 0); | |
| } | |
| static PyObject * | |
| utf32be_encode(textio *self, PyObject *text) | |
| { | |
| return PyUnicode_EncodeUTF32(PyUnicode_AS_UNICODE(text), | |
| PyUnicode_GET_SIZE(text), | |
| PyBytes_AS_STRING(self->errors), 1); | |
| } | |
| static PyObject * | |
| utf32le_encode(textio *self, PyObject *text) | |
| { | |
| return PyUnicode_EncodeUTF32(PyUnicode_AS_UNICODE(text), | |
| PyUnicode_GET_SIZE(text), | |
| PyBytes_AS_STRING(self->errors), -1); | |
| } | |
| static PyObject * | |
| utf32_encode(textio *self, PyObject *text) | |
| { | |
| if (!self->encoding_start_of_stream) { | |
| /* Skip the BOM and use native byte ordering */ | |
| #if defined(WORDS_BIGENDIAN) | |
| return utf32be_encode(self, text); | |
| #else | |
| return utf32le_encode(self, text); | |
| #endif | |
| } | |
| return PyUnicode_EncodeUTF32(PyUnicode_AS_UNICODE(text), | |
| PyUnicode_GET_SIZE(text), | |
| PyBytes_AS_STRING(self->errors), 0); | |
| } | |
| static PyObject * | |
| utf8_encode(textio *self, PyObject *text) | |
| { | |
| return PyUnicode_EncodeUTF8(PyUnicode_AS_UNICODE(text), | |
| PyUnicode_GET_SIZE(text), | |
| PyBytes_AS_STRING(self->errors)); | |
| } | |
| static PyObject * | |
| latin1_encode(textio *self, PyObject *text) | |
| { | |
| return PyUnicode_EncodeLatin1(PyUnicode_AS_UNICODE(text), | |
| PyUnicode_GET_SIZE(text), | |
| PyBytes_AS_STRING(self->errors)); | |
| } | |
| /* Map normalized encoding names onto the specialized encoding funcs */ | |
| typedef struct { | |
| const char *name; | |
| encodefunc_t encodefunc; | |
| } encodefuncentry; | |
| static encodefuncentry encodefuncs[] = { | |
| {"ascii", (encodefunc_t) ascii_encode}, | |
| {"iso8859-1", (encodefunc_t) latin1_encode}, | |
| {"utf-8", (encodefunc_t) utf8_encode}, | |
| {"utf-16-be", (encodefunc_t) utf16be_encode}, | |
| {"utf-16-le", (encodefunc_t) utf16le_encode}, | |
| {"utf-16", (encodefunc_t) utf16_encode}, | |
| {"utf-32-be", (encodefunc_t) utf32be_encode}, | |
| {"utf-32-le", (encodefunc_t) utf32le_encode}, | |
| {"utf-32", (encodefunc_t) utf32_encode}, | |
| {NULL, NULL} | |
| }; | |
| static int | |
| textiowrapper_init(textio *self, PyObject *args, PyObject *kwds) | |
| { | |
| char *kwlist[] = {"buffer", "encoding", "errors", | |
| "newline", "line_buffering", | |
| NULL}; | |
| PyObject *buffer, *raw; | |
| char *encoding = NULL; | |
| char *errors = NULL; | |
| char *newline = NULL; | |
| int line_buffering = 0; | |
| PyObject *res; | |
| int r; | |
| self->ok = 0; | |
| self->detached = 0; | |
| if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|zzzi:fileio", | |
| kwlist, &buffer, &encoding, &errors, | |
| &newline, &line_buffering)) | |
| return -1; | |
| if (newline && newline[0] != '\0' | |
| && !(newline[0] == '\n' && newline[1] == '\0') | |
| && !(newline[0] == '\r' && newline[1] == '\0') | |
| && !(newline[0] == '\r' && newline[1] == '\n' && newline[2] == '\0')) { | |
| PyErr_Format(PyExc_ValueError, | |
| "illegal newline value: %s", newline); | |
| return -1; | |
| } | |
| Py_CLEAR(self->buffer); | |
| Py_CLEAR(self->encoding); | |
| Py_CLEAR(self->encoder); | |
| Py_CLEAR(self->decoder); | |
| Py_CLEAR(self->readnl); | |
| Py_CLEAR(self->decoded_chars); | |
| Py_CLEAR(self->pending_bytes); | |
| Py_CLEAR(self->snapshot); | |
| Py_CLEAR(self->errors); | |
| Py_CLEAR(self->raw); | |
| self->decoded_chars_used = 0; | |
| self->pending_bytes_count = 0; | |
| self->encodefunc = NULL; | |
| self->writenl = NULL; | |
| if (encoding == NULL && self->encoding == NULL) { | |
| if (_PyIO_locale_module == NULL) { | |
| _PyIO_locale_module = PyImport_ImportModule("locale"); | |
| if (_PyIO_locale_module == NULL) | |
| goto catch_ImportError; | |
| else | |
| goto use_locale; | |
| } | |
| else { | |
| use_locale: | |
| self->encoding = PyObject_CallMethod( | |
| _PyIO_locale_module, "getpreferredencoding", NULL); | |
| if (self->encoding == NULL) { | |
| catch_ImportError: | |
| /* | |
| Importing locale can raise a ImportError because of | |
| _functools, and locale.getpreferredencoding can raise a | |
| ImportError if _locale is not available. These will happen | |
| during module building. | |
| */ | |
| if (PyErr_ExceptionMatches(PyExc_ImportError)) { | |
| PyErr_Clear(); | |
| self->encoding = PyString_FromString("ascii"); | |
| } | |
| else | |
| goto error; | |
| } | |
| else if (!PyString_Check(self->encoding)) | |
| Py_CLEAR(self->encoding); | |
| } | |
| } | |
| if (self->encoding != NULL) | |
| encoding = PyString_AsString(self->encoding); | |
| else if (encoding != NULL) { | |
| self->encoding = PyString_FromString(encoding); | |
| if (self->encoding == NULL) | |
| goto error; | |
| } | |
| else { | |
| PyErr_SetString(PyExc_IOError, | |
| "could not determine default encoding"); | |
| } | |
| if (errors == NULL) | |
| errors = "strict"; | |
| self->errors = PyBytes_FromString(errors); | |
| if (self->errors == NULL) | |
| goto error; | |
| self->chunk_size = 8192; | |
| self->readuniversal = (newline == NULL || newline[0] == '\0'); | |
| self->line_buffering = line_buffering; | |
| self->readtranslate = (newline == NULL); | |
| if (newline) { | |
| self->readnl = PyString_FromString(newline); | |
| if (self->readnl == NULL) | |
| return -1; | |
| } | |
| self->writetranslate = (newline == NULL || newline[0] != '\0'); | |
| if (!self->readuniversal && self->writetranslate) { | |
| self->writenl = PyString_AsString(self->readnl); | |
| if (!strcmp(self->writenl, "\n")) | |
| self->writenl = NULL; | |
| } | |
| #ifdef MS_WINDOWS | |
| else | |
| self->writenl = "\r\n"; | |
| #endif | |
| /* Build the decoder object */ | |
| res = PyObject_CallMethod(buffer, "readable", NULL); | |
| if (res == NULL) | |
| goto error; | |
| r = PyObject_IsTrue(res); | |
| Py_DECREF(res); | |
| if (r == -1) | |
| goto error; | |
| if (r == 1) { | |
| self->decoder = PyCodec_IncrementalDecoder( | |
| encoding, errors); | |
| if (self->decoder == NULL) | |
| goto error; | |
| if (self->readuniversal) { | |
| PyObject *incrementalDecoder = PyObject_CallFunction( | |
| (PyObject *)&PyIncrementalNewlineDecoder_Type, | |
| "Oi", self->decoder, (int)self->readtranslate); | |
| if (incrementalDecoder == NULL) | |
| goto error; | |
| Py_CLEAR(self->decoder); | |
| self->decoder = incrementalDecoder; | |
| } | |
| } | |
| /* Build the encoder object */ | |
| res = PyObject_CallMethod(buffer, "writable", NULL); | |
| if (res == NULL) | |
| goto error; | |
| r = PyObject_IsTrue(res); | |
| Py_DECREF(res); | |
| if (r == -1) | |
| goto error; | |
| if (r == 1) { | |
| PyObject *ci; | |
| self->encoder = PyCodec_IncrementalEncoder( | |
| encoding, errors); | |
| if (self->encoder == NULL) | |
| goto error; | |
| /* Get the normalized named of the codec */ | |
| ci = _PyCodec_Lookup(encoding); | |
| if (ci == NULL) | |
| goto error; | |
| res = PyObject_GetAttrString(ci, "name"); | |
| Py_DECREF(ci); | |
| if (res == NULL) { | |
| if (PyErr_ExceptionMatches(PyExc_AttributeError)) | |
| PyErr_Clear(); | |
| else | |
| goto error; | |
| } | |
| else if (PyString_Check(res)) { | |
| encodefuncentry *e = encodefuncs; | |
| while (e->name != NULL) { | |
| if (!strcmp(PyString_AS_STRING(res), e->name)) { | |
| self->encodefunc = e->encodefunc; | |
| break; | |
| } | |
| e++; | |
| } | |
| } | |
| Py_XDECREF(res); | |
| } | |
| self->buffer = buffer; | |
| Py_INCREF(buffer); | |
| if (Py_TYPE(buffer) == &PyBufferedReader_Type || | |
| Py_TYPE(buffer) == &PyBufferedWriter_Type || | |
| Py_TYPE(buffer) == &PyBufferedRandom_Type) { | |
| raw = PyObject_GetAttrString(buffer, "raw"); | |
| /* Cache the raw FileIO object to speed up 'closed' checks */ | |
| if (raw == NULL) { | |
| if (PyErr_ExceptionMatches(PyExc_AttributeError)) | |
| PyErr_Clear(); | |
| else | |
| goto error; | |
| } | |
| else if (Py_TYPE(raw) == &PyFileIO_Type) | |
| self->raw = raw; | |
| else | |
| Py_DECREF(raw); | |
| } | |
| res = PyObject_CallMethod(buffer, "seekable", NULL); | |
| if (res == NULL) | |
| goto error; | |
| self->seekable = self->telling = PyObject_IsTrue(res); | |
| Py_DECREF(res); | |
| self->encoding_start_of_stream = 0; | |
| if (self->seekable && self->encoder) { | |
| PyObject *cookieObj; | |
| int cmp; | |
| self->encoding_start_of_stream = 1; | |
| cookieObj = PyObject_CallMethodObjArgs(buffer, _PyIO_str_tell, NULL); | |
| if (cookieObj == NULL) | |
| goto error; | |
| cmp = PyObject_RichCompareBool(cookieObj, _PyIO_zero, Py_EQ); | |
| Py_DECREF(cookieObj); | |
| if (cmp < 0) { | |
| goto error; | |
| } | |
| if (cmp == 0) { | |
| self->encoding_start_of_stream = 0; | |
| res = PyObject_CallMethodObjArgs(self->encoder, _PyIO_str_setstate, | |
| _PyIO_zero, NULL); | |
| if (res == NULL) | |
| goto error; | |
| Py_DECREF(res); | |
| } | |
| } | |
| self->ok = 1; | |
| return 0; | |
| error: | |
| return -1; | |
| } | |
| static int | |
| _textiowrapper_clear(textio *self) | |
| { | |
| if (self->ok && _PyIOBase_finalize((PyObject *) self) < 0) | |
| return -1; | |
| self->ok = 0; | |
| Py_CLEAR(self->buffer); | |
| Py_CLEAR(self->encoding); | |
| Py_CLEAR(self->encoder); | |
| Py_CLEAR(self->decoder); | |
| Py_CLEAR(self->readnl); | |
| Py_CLEAR(self->decoded_chars); | |
| Py_CLEAR(self->pending_bytes); | |
| Py_CLEAR(self->snapshot); | |
| Py_CLEAR(self->errors); | |
| Py_CLEAR(self->raw); | |
| return 0; | |
| } | |
| static void | |
| textiowrapper_dealloc(textio *self) | |
| { | |
| if (_textiowrapper_clear(self) < 0) | |
| return; | |
| _PyObject_GC_UNTRACK(self); | |
| if (self->weakreflist != NULL) | |
| PyObject_ClearWeakRefs((PyObject *)self); | |
| Py_CLEAR(self->dict); | |
| Py_TYPE(self)->tp_free((PyObject *)self); | |
| } | |
| static int | |
| textiowrapper_traverse(textio *self, visitproc visit, void *arg) | |
| { | |
| Py_VISIT(self->buffer); | |
| Py_VISIT(self->encoding); | |
| Py_VISIT(self->encoder); | |
| Py_VISIT(self->decoder); | |
| Py_VISIT(self->readnl); | |
| Py_VISIT(self->decoded_chars); | |
| Py_VISIT(self->pending_bytes); | |
| Py_VISIT(self->snapshot); | |
| Py_VISIT(self->errors); | |
| Py_VISIT(self->raw); | |
| Py_VISIT(self->dict); | |
| return 0; | |
| } | |
| static int | |
| textiowrapper_clear(textio *self) | |
| { | |
| if (_textiowrapper_clear(self) < 0) | |
| return -1; | |
| Py_CLEAR(self->dict); | |
| return 0; | |
| } | |
| static PyObject * | |
| textiowrapper_closed_get(textio *self, void *context); | |
| /* This macro takes some shortcuts to make the common case faster. */ | |
| #define CHECK_CLOSED(self) \ | |
| do { \ | |
| int r; \ | |
| PyObject *_res; \ | |
| if (Py_TYPE(self) == &PyTextIOWrapper_Type) { \ | |
| if (self->raw != NULL) \ | |
| r = _PyFileIO_closed(self->raw); \ | |
| else { \ | |
| _res = textiowrapper_closed_get(self, NULL); \ | |
| if (_res == NULL) \ | |
| return NULL; \ | |
| r = PyObject_IsTrue(_res); \ | |
| Py_DECREF(_res); \ | |
| if (r < 0) \ | |
| return NULL; \ | |
| } \ | |
| if (r > 0) { \ | |
| PyErr_SetString(PyExc_ValueError, \ | |
| "I/O operation on closed file."); \ | |
| return NULL; \ | |
| } \ | |
| } \ | |
| else if (_PyIOBase_check_closed((PyObject *)self, Py_True) == NULL) \ | |
| return NULL; \ | |
| } while (0) | |
| #define CHECK_INITIALIZED(self) \ | |
| if (self->ok <= 0) { \ | |
| if (self->detached) { \ | |
| PyErr_SetString(PyExc_ValueError, \ | |
| "underlying buffer has been detached"); \ | |
| } else { \ | |
| PyErr_SetString(PyExc_ValueError, \ | |
| "I/O operation on uninitialized object"); \ | |
| } \ | |
| return NULL; \ | |
| } | |
| #define CHECK_INITIALIZED_INT(self) \ | |
| if (self->ok <= 0) { \ | |
| if (self->detached) { \ | |
| PyErr_SetString(PyExc_ValueError, \ | |
| "underlying buffer has been detached"); \ | |
| } else { \ | |
| PyErr_SetString(PyExc_ValueError, \ | |
| "I/O operation on uninitialized object"); \ | |
| } \ | |
| return -1; \ | |
| } | |
| static PyObject * | |
| textiowrapper_detach(textio *self) | |
| { | |
| PyObject *buffer, *res; | |
| CHECK_INITIALIZED(self); | |
| res = PyObject_CallMethodObjArgs((PyObject *)self, _PyIO_str_flush, NULL); | |
| if (res == NULL) | |
| return NULL; | |
| Py_DECREF(res); | |
| buffer = self->buffer; | |
| self->buffer = NULL; | |
| self->detached = 1; | |
| self->ok = 0; | |
| return buffer; | |
| } | |
| Py_LOCAL_INLINE(const Py_UNICODE *) | |
| findchar(const Py_UNICODE *s, Py_ssize_t size, Py_UNICODE ch) | |
| { | |
| /* like wcschr, but doesn't stop at NULL characters */ | |
| while (size-- > 0) { | |
| if (*s == ch) | |
| return s; | |
| s++; | |
| } | |
| return NULL; | |
| } | |
| /* Flush the internal write buffer. This doesn't explicitly flush the | |
| underlying buffered object, though. */ | |
| static int | |
| _textiowrapper_writeflush(textio *self) | |
| { | |
| PyObject *pending, *b, *ret; | |
| if (self->pending_bytes == NULL) | |
| return 0; | |
| pending = self->pending_bytes; | |
| Py_INCREF(pending); | |
| self->pending_bytes_count = 0; | |
| Py_CLEAR(self->pending_bytes); | |
| b = _PyBytes_Join(_PyIO_empty_bytes, pending); | |
| Py_DECREF(pending); | |
| if (b == NULL) | |
| return -1; | |
| ret = PyObject_CallMethodObjArgs(self->buffer, | |
| _PyIO_str_write, b, NULL); | |
| Py_DECREF(b); | |
| if (ret == NULL) | |
| return -1; | |
| Py_DECREF(ret); | |
| return 0; | |
| } | |
| static PyObject * | |
| textiowrapper_write(textio *self, PyObject *args) | |
| { | |
| PyObject *ret; | |
| PyObject *text; /* owned reference */ | |
| PyObject *b; | |
| Py_ssize_t textlen; | |
| int haslf = 0; | |
| int needflush = 0; | |
| CHECK_INITIALIZED(self); | |
| if (!PyArg_ParseTuple(args, "U:write", &text)) { | |
| return NULL; | |
| } | |
| CHECK_CLOSED(self); | |
| if (self->encoder == NULL) { | |
| PyErr_SetString(PyExc_IOError, "not writable"); | |
| return NULL; | |
| } | |
| Py_INCREF(text); | |
| textlen = PyUnicode_GetSize(text); | |
| if ((self->writetranslate && self->writenl != NULL) || self->line_buffering) | |
| if (findchar(PyUnicode_AS_UNICODE(text), | |
| PyUnicode_GET_SIZE(text), '\n')) | |
| haslf = 1; | |
| if (haslf && self->writetranslate && self->writenl != NULL) { | |
| PyObject *newtext = PyObject_CallMethod( | |
| text, "replace", "ss", "\n", self->writenl); | |
| Py_DECREF(text); | |
| if (newtext == NULL) | |
| return NULL; | |
| text = newtext; | |
| } | |
| if (self->line_buffering && | |
| (haslf || | |
| findchar(PyUnicode_AS_UNICODE(text), | |
| PyUnicode_GET_SIZE(text), '\r'))) | |
| needflush = 1; | |
| /* XXX What if we were just reading? */ | |
| if (self->encodefunc != NULL) { | |
| b = (*self->encodefunc)((PyObject *) self, text); | |
| self->encoding_start_of_stream = 0; | |
| } | |
| else | |
| b = PyObject_CallMethodObjArgs(self->encoder, | |
| _PyIO_str_encode, text, NULL); | |
| Py_DECREF(text); | |
| if (b == NULL) | |
| return NULL; | |
| if (self->pending_bytes == NULL) { | |
| self->pending_bytes = PyList_New(0); | |
| if (self->pending_bytes == NULL) { | |
| Py_DECREF(b); | |
| return NULL; | |
| } | |
| self->pending_bytes_count = 0; | |
| } | |
| if (PyList_Append(self->pending_bytes, b) < 0) { | |
| Py_DECREF(b); | |
| return NULL; | |
| } | |
| self->pending_bytes_count += PyBytes_GET_SIZE(b); | |
| Py_DECREF(b); | |
| if (self->pending_bytes_count > self->chunk_size || needflush) { | |
| if (_textiowrapper_writeflush(self) < 0) | |
| return NULL; | |
| } | |
| if (needflush) { | |
| ret = PyObject_CallMethodObjArgs(self->buffer, _PyIO_str_flush, NULL); | |
| if (ret == NULL) | |
| return NULL; | |
| Py_DECREF(ret); | |
| } | |
| Py_CLEAR(self->snapshot); | |
| if (self->decoder) { | |
| ret = PyObject_CallMethod(self->decoder, "reset", NULL); | |
| if (ret == NULL) | |
| return NULL; | |
| Py_DECREF(ret); | |
| } | |
| return PyLong_FromSsize_t(textlen); | |
| } | |
| /* Steal a reference to chars and store it in the decoded_char buffer; | |
| */ | |
| static void | |
| textiowrapper_set_decoded_chars(textio *self, PyObject *chars) | |
| { | |
| Py_CLEAR(self->decoded_chars); | |
| self->decoded_chars = chars; | |
| self->decoded_chars_used = 0; | |
| } | |
| static PyObject * | |
| textiowrapper_get_decoded_chars(textio *self, Py_ssize_t n) | |
| { | |
| PyObject *chars; | |
| Py_ssize_t avail; | |
| if (self->decoded_chars == NULL) | |
| return PyUnicode_FromStringAndSize(NULL, 0); | |
| avail = (PyUnicode_GET_SIZE(self->decoded_chars) | |
| - self->decoded_chars_used); | |
| assert(avail >= 0); | |
| if (n < 0 || n > avail) | |
| n = avail; | |
| if (self->decoded_chars_used > 0 || n < avail) { | |
| chars = PyUnicode_FromUnicode( | |
| PyUnicode_AS_UNICODE(self->decoded_chars) | |
| + self->decoded_chars_used, n); | |
| if (chars == NULL) | |
| return NULL; | |
| } | |
| else { | |
| chars = self->decoded_chars; | |
| Py_INCREF(chars); | |
| } | |
| self->decoded_chars_used += n; | |
| return chars; | |
| } | |
| /* Read and decode the next chunk of data from the BufferedReader. | |
| */ | |
| static int | |
| textiowrapper_read_chunk(textio *self) | |
| { | |
| PyObject *dec_buffer = NULL; | |
| PyObject *dec_flags = NULL; | |
| PyObject *input_chunk = NULL; | |
| PyObject *decoded_chars, *chunk_size; | |
| int eof; | |
| /* The return value is True unless EOF was reached. The decoded string is | |
| * placed in self._decoded_chars (replacing its previous value). The | |
| * entire input chunk is sent to the decoder, though some of it may remain | |
| * buffered in the decoder, yet to be converted. | |
| */ | |
| if (self->decoder == NULL) { | |
| PyErr_SetString(PyExc_IOError, "not readable"); | |
| return -1; | |
| } | |
| if (self->telling) { | |
| /* To prepare for tell(), we need to snapshot a point in the file | |
| * where the decoder's input buffer is empty. | |
| */ | |
| PyObject *state = PyObject_CallMethodObjArgs(self->decoder, | |
| _PyIO_str_getstate, NULL); | |
| if (state == NULL) | |
| return -1; | |
| /* Given this, we know there was a valid snapshot point | |
| * len(dec_buffer) bytes ago with decoder state (b'', dec_flags). | |
| */ | |
| if (PyArg_Parse(state, "(OO)", &dec_buffer, &dec_flags) < 0) { | |
| Py_DECREF(state); | |
| return -1; | |
| } | |
| Py_INCREF(dec_buffer); | |
| Py_INCREF(dec_flags); | |
| Py_DECREF(state); | |
| } | |
| /* Read a chunk, decode it, and put the result in self._decoded_chars. */ | |
| chunk_size = PyLong_FromSsize_t(self->chunk_size); | |
| if (chunk_size == NULL) | |
| goto fail; | |
| input_chunk = PyObject_CallMethodObjArgs(self->buffer, | |
| _PyIO_str_read1, chunk_size, NULL); | |
| Py_DECREF(chunk_size); | |
| if (input_chunk == NULL) | |
| goto fail; | |
| assert(PyBytes_Check(input_chunk)); | |
| eof = (PyBytes_Size(input_chunk) == 0); | |
| if (Py_TYPE(self->decoder) == &PyIncrementalNewlineDecoder_Type) { | |
| decoded_chars = _PyIncrementalNewlineDecoder_decode( | |
| self->decoder, input_chunk, eof); | |
| } | |
| else { | |
| decoded_chars = PyObject_CallMethodObjArgs(self->decoder, | |
| _PyIO_str_decode, input_chunk, eof ? Py_True : Py_False, NULL); | |
| } | |
| /* TODO sanity check: isinstance(decoded_chars, unicode) */ | |
| if (decoded_chars == NULL) | |
| goto fail; | |
| textiowrapper_set_decoded_chars(self, decoded_chars); | |
| if (PyUnicode_GET_SIZE(decoded_chars) > 0) | |
| eof = 0; | |
| if (self->telling) { | |
| /* At the snapshot point, len(dec_buffer) bytes before the read, the | |
| * next input to be decoded is dec_buffer + input_chunk. | |
| */ | |
| PyObject *next_input = PyNumber_Add(dec_buffer, input_chunk); | |
| if (next_input == NULL) | |
| goto fail; | |
| assert (PyBytes_Check(next_input)); | |
| Py_DECREF(dec_buffer); | |
| Py_CLEAR(self->snapshot); | |
| self->snapshot = Py_BuildValue("NN", dec_flags, next_input); | |
| } | |
| Py_DECREF(input_chunk); | |
| return (eof == 0); | |
| fail: | |
| Py_XDECREF(dec_buffer); | |
| Py_XDECREF(dec_flags); | |
| Py_XDECREF(input_chunk); | |
| return -1; | |
| } | |
| static PyObject * | |
| textiowrapper_read(textio *self, PyObject *args) | |
| { | |
| Py_ssize_t n = -1; | |
| PyObject *result = NULL, *chunks = NULL; | |
| CHECK_INITIALIZED(self); | |
| if (!PyArg_ParseTuple(args, "|O&:read", &_PyIO_ConvertSsize_t, &n)) | |
| return NULL; | |
| CHECK_CLOSED(self); | |
| if (self->decoder == NULL) { | |
| PyErr_SetString(PyExc_IOError, "not readable"); | |
| return NULL; | |
| } | |
| if (_textiowrapper_writeflush(self) < 0) | |
| return NULL; | |
| if (n < 0) { | |
| /* Read everything */ | |
| PyObject *bytes = PyObject_CallMethod(self->buffer, "read", NULL); | |
| PyObject *decoded, *final; | |
| if (bytes == NULL) | |
| goto fail; | |
| decoded = PyObject_CallMethodObjArgs(self->decoder, _PyIO_str_decode, | |
| bytes, Py_True, NULL); | |
| Py_DECREF(bytes); | |
| if (decoded == NULL) | |
| goto fail; | |
| result = textiowrapper_get_decoded_chars(self, -1); | |
| if (result == NULL) { | |
| Py_DECREF(decoded); | |
| return NULL; | |
| } | |
| final = PyUnicode_Concat(result, decoded); | |
| Py_DECREF(result); | |
| Py_DECREF(decoded); | |
| if (final == NULL) | |
| goto fail; | |
| Py_CLEAR(self->snapshot); | |
| return final; | |
| } | |
| else { | |
| int res = 1; | |
| Py_ssize_t remaining = n; | |
| result = textiowrapper_get_decoded_chars(self, n); | |
| if (result == NULL) | |
| goto fail; | |
| remaining -= PyUnicode_GET_SIZE(result); | |
| /* Keep reading chunks until we have n characters to return */ | |
| while (remaining > 0) { | |
| res = textiowrapper_read_chunk(self); | |
| if (res < 0) | |
| goto fail; | |
| if (res == 0) /* EOF */ | |
| break; | |
| if (chunks == NULL) { | |
| chunks = PyList_New(0); | |
| if (chunks == NULL) | |
| goto fail; | |
| } | |
| if (PyList_Append(chunks, result) < 0) | |
| goto fail; | |
| Py_DECREF(result); | |
| result = textiowrapper_get_decoded_chars(self, remaining); | |
| if (result == NULL) | |
| goto fail; | |
| remaining -= PyUnicode_GET_SIZE(result); | |
| } | |
| if (chunks != NULL) { | |
| if (result != NULL && PyList_Append(chunks, result) < 0) | |
| goto fail; | |
| Py_CLEAR(result); | |
| result = PyUnicode_Join(_PyIO_empty_str, chunks); | |
| if (result == NULL) | |
| goto fail; | |
| Py_CLEAR(chunks); | |
| } | |
| return result; | |
| } | |
| fail: | |
| Py_XDECREF(result); | |
| Py_XDECREF(chunks); | |
| return NULL; | |
| } | |
| /* NOTE: `end` must point to the real end of the Py_UNICODE storage, | |
| that is to the NUL character. Otherwise the function will produce | |
| incorrect results. */ | |
| static Py_UNICODE * | |
| find_control_char(Py_UNICODE *start, Py_UNICODE *end, Py_UNICODE ch) | |
| { | |
| Py_UNICODE *s = start; | |
| for (;;) { | |
| while (*s > ch) | |
| s++; | |
| if (*s == ch) | |
| return s; | |
| if (s == end) | |
| return NULL; | |
| s++; | |
| } | |
| } | |
| Py_ssize_t | |
| _PyIO_find_line_ending( | |
| int translated, int universal, PyObject *readnl, | |
| Py_UNICODE *start, Py_UNICODE *end, Py_ssize_t *consumed) | |
| { | |
| Py_ssize_t len = end - start; | |
| if (translated) { | |
| /* Newlines are already translated, only search for \n */ | |
| Py_UNICODE *pos = find_control_char(start, end, '\n'); | |
| if (pos != NULL) | |
| return pos - start + 1; | |
| else { | |
| *consumed = len; | |
| return -1; | |
| } | |
| } | |
| else if (universal) { | |
| /* Universal newline search. Find any of \r, \r\n, \n | |
| * The decoder ensures that \r\n are not split in two pieces | |
| */ | |
| Py_UNICODE *s = start; | |
| for (;;) { | |
| Py_UNICODE ch; | |
| /* Fast path for non-control chars. The loop always ends | |
| since the Py_UNICODE storage is NUL-terminated. */ | |
| while (*s > '\r') | |
| s++; | |
| if (s >= end) { | |
| *consumed = len; | |
| return -1; | |
| } | |
| ch = *s++; | |
| if (ch == '\n') | |
| return s - start; | |
| if (ch == '\r') { | |
| if (*s == '\n') | |
| return s - start + 1; | |
| else | |
| return s - start; | |
| } | |
| } | |
| } | |
| else { | |
| /* Non-universal mode. */ | |
| Py_ssize_t readnl_len = PyString_GET_SIZE(readnl); | |
| unsigned char *nl = (unsigned char *) PyString_AS_STRING(readnl); | |
| if (readnl_len == 1) { | |
| Py_UNICODE *pos = find_control_char(start, end, nl[0]); | |
| if (pos != NULL) | |
| return pos - start + 1; | |
| *consumed = len; | |
| return -1; | |
| } | |
| else { | |
| Py_UNICODE *s = start; | |
| Py_UNICODE *e = end - readnl_len + 1; | |
| Py_UNICODE *pos; | |
| if (e < s) | |
| e = s; | |
| while (s < e) { | |
| Py_ssize_t i; | |
| Py_UNICODE *pos = find_control_char(s, end, nl[0]); | |
| if (pos == NULL || pos >= e) | |
| break; | |
| for (i = 1; i < readnl_len; i++) { | |
| if (pos[i] != nl[i]) | |
| break; | |
| } | |
| if (i == readnl_len) | |
| return pos - start + readnl_len; | |
| s = pos + 1; | |
| } | |
| pos = find_control_char(e, end, nl[0]); | |
| if (pos == NULL) | |
| *consumed = len; | |
| else | |
| *consumed = pos - start; | |
| return -1; | |
| } | |
| } | |
| } | |
| static PyObject * | |
| _textiowrapper_readline(textio *self, Py_ssize_t limit) | |
| { | |
| PyObject *line = NULL, *chunks = NULL, *remaining = NULL; | |
| Py_ssize_t start, endpos, chunked, offset_to_buffer; | |
| int res; | |
| CHECK_CLOSED(self); | |
| if (_textiowrapper_writeflush(self) < 0) | |
| return NULL; | |
| chunked = 0; | |
| while (1) { | |
| Py_UNICODE *ptr; | |
| Py_ssize_t line_len; | |
| Py_ssize_t consumed = 0; | |
| /* First, get some data if necessary */ | |
| res = 1; | |
| while (!self->decoded_chars || | |
| !PyUnicode_GET_SIZE(self->decoded_chars)) { | |
| res = textiowrapper_read_chunk(self); | |
| if (res < 0) | |
| goto error; | |
| if (res == 0) | |
| break; | |
| } | |
| if (res == 0) { | |
| /* end of file */ | |
| textiowrapper_set_decoded_chars(self, NULL); | |
| Py_CLEAR(self->snapshot); | |
| start = endpos = offset_to_buffer = 0; | |
| break; | |
| } | |
| if (remaining == NULL) { | |
| line = self->decoded_chars; | |
| start = self->decoded_chars_used; | |
| offset_to_buffer = 0; | |
| Py_INCREF(line); | |
| } | |
| else { | |
| assert(self->decoded_chars_used == 0); | |
| line = PyUnicode_Concat(remaining, self->decoded_chars); | |
| start = 0; | |
| offset_to_buffer = PyUnicode_GET_SIZE(remaining); | |
| Py_CLEAR(remaining); | |
| if (line == NULL) | |
| goto error; | |
| } | |
| ptr = PyUnicode_AS_UNICODE(line); | |
| line_len = PyUnicode_GET_SIZE(line); | |
| endpos = _PyIO_find_line_ending( | |
| self->readtranslate, self->readuniversal, self->readnl, | |
| ptr + start, ptr + line_len, &consumed); | |
| if (endpos >= 0) { | |
| endpos += start; | |
| if (limit >= 0 && (endpos - start) + chunked >= limit) | |
| endpos = start + limit - chunked; | |
| break; | |
| } | |
| /* We can put aside up to `endpos` */ | |
| endpos = consumed + start; | |
| if (limit >= 0 && (endpos - start) + chunked >= limit) { | |
| /* Didn't find line ending, but reached length limit */ | |
| endpos = start + limit - chunked; | |
| break; | |
| } | |
| if (endpos > start) { | |
| /* No line ending seen yet - put aside current data */ | |
| PyObject *s; | |
| if (chunks == NULL) { | |
| chunks = PyList_New(0); | |
| if (chunks == NULL) | |
| goto error; | |
| } | |
| s = PyUnicode_FromUnicode(ptr + start, endpos - start); | |
| if (s == NULL) | |
| goto error; | |
| if (PyList_Append(chunks, s) < 0) { | |
| Py_DECREF(s); | |
| goto error; | |
| } | |
| chunked += PyUnicode_GET_SIZE(s); | |
| Py_DECREF(s); | |
| } | |
| /* There may be some remaining bytes we'll have to prepend to the | |
| next chunk of data */ | |
| if (endpos < line_len) { | |
| remaining = PyUnicode_FromUnicode( | |
| ptr + endpos, line_len - endpos); | |
| if (remaining == NULL) | |
| goto error; | |
| } | |
| Py_CLEAR(line); | |
| /* We have consumed the buffer */ | |
| textiowrapper_set_decoded_chars(self, NULL); | |
| } | |
| if (line != NULL) { | |
| /* Our line ends in the current buffer */ | |
| self->decoded_chars_used = endpos - offset_to_buffer; | |
| if (start > 0 || endpos < PyUnicode_GET_SIZE(line)) { | |
| if (start == 0 && Py_REFCNT(line) == 1) { | |
| if (PyUnicode_Resize(&line, endpos) < 0) | |
| goto error; | |
| } | |
| else { | |
| PyObject *s = PyUnicode_FromUnicode( | |
| PyUnicode_AS_UNICODE(line) + start, endpos - start); | |
| Py_CLEAR(line); | |
| if (s == NULL) | |
| goto error; | |
| line = s; | |
| } | |
| } | |
| } | |
| if (remaining != NULL) { | |
| if (chunks == NULL) { | |
| chunks = PyList_New(0); | |
| if (chunks == NULL) | |
| goto error; | |
| } | |
| if (PyList_Append(chunks, remaining) < 0) | |
| goto error; | |
| Py_CLEAR(remaining); | |
| } | |
| if (chunks != NULL) { | |
| if (line != NULL && PyList_Append(chunks, line) < 0) | |
| goto error; | |
| Py_CLEAR(line); | |
| line = PyUnicode_Join(_PyIO_empty_str, chunks); | |
| if (line == NULL) | |
| goto error; | |
| Py_DECREF(chunks); | |
| } | |
| if (line == NULL) | |
| line = PyUnicode_FromStringAndSize(NULL, 0); | |
| return line; | |
| error: | |
| Py_XDECREF(chunks); | |
| Py_XDECREF(remaining); | |
| Py_XDECREF(line); | |
| return NULL; | |
| } | |
| static PyObject * | |
| textiowrapper_readline(textio *self, PyObject *args) | |
| { | |
| PyObject *limitobj = NULL; | |
| Py_ssize_t limit = -1; | |
| CHECK_INITIALIZED(self); | |
| if (!PyArg_ParseTuple(args, "|O:readline", &limitobj)) { | |
| return NULL; | |
| } | |
| if (limitobj) { | |
| if (!PyNumber_Check(limitobj)) { | |
| PyErr_Format(PyExc_TypeError, | |
| "integer argument expected, got '%.200s'", | |
| Py_TYPE(limitobj)->tp_name); | |
| return NULL; | |
| } | |
| limit = PyNumber_AsSsize_t(limitobj, PyExc_OverflowError); | |
| if (limit == -1 && PyErr_Occurred()) | |
| return NULL; | |
| } | |
| return _textiowrapper_readline(self, limit); | |
| } | |
| /* Seek and Tell */ | |
| typedef struct { | |
| Py_off_t start_pos; | |
| int dec_flags; | |
| int bytes_to_feed; | |
| int chars_to_skip; | |
| char need_eof; | |
| } cookie_type; | |
| /* | |
| To speed up cookie packing/unpacking, we store the fields in a temporary | |
| string and call _PyLong_FromByteArray() or _PyLong_AsByteArray (resp.). | |
| The following macros define at which offsets in the intermediary byte | |
| string the various CookieStruct fields will be stored. | |
| */ | |
| #define COOKIE_BUF_LEN (sizeof(Py_off_t) + 3 * sizeof(int) + sizeof(char)) | |
| #if defined(WORDS_BIGENDIAN) | |
| # define IS_LITTLE_ENDIAN 0 | |
| /* We want the least significant byte of start_pos to also be the least | |
| significant byte of the cookie, which means that in big-endian mode we | |
| must copy the fields in reverse order. */ | |
| # define OFF_START_POS (sizeof(char) + 3 * sizeof(int)) | |
| # define OFF_DEC_FLAGS (sizeof(char) + 2 * sizeof(int)) | |
| # define OFF_BYTES_TO_FEED (sizeof(char) + sizeof(int)) | |
| # define OFF_CHARS_TO_SKIP (sizeof(char)) | |
| # define OFF_NEED_EOF 0 | |
| #else | |
| # define IS_LITTLE_ENDIAN 1 | |
| /* Little-endian mode: the least significant byte of start_pos will | |
| naturally end up the least significant byte of the cookie. */ | |
| # define OFF_START_POS 0 | |
| # define OFF_DEC_FLAGS (sizeof(Py_off_t)) | |
| # define OFF_BYTES_TO_FEED (sizeof(Py_off_t) + sizeof(int)) | |
| # define OFF_CHARS_TO_SKIP (sizeof(Py_off_t) + 2 * sizeof(int)) | |
| # define OFF_NEED_EOF (sizeof(Py_off_t) + 3 * sizeof(int)) | |
| #endif | |
| static int | |
| textiowrapper_parse_cookie(cookie_type *cookie, PyObject *cookieObj) | |
| { | |
| unsigned char buffer[COOKIE_BUF_LEN]; | |
| PyLongObject *cookieLong = (PyLongObject *)PyNumber_Long(cookieObj); | |
| if (cookieLong == NULL) | |
| return -1; | |
| if (_PyLong_AsByteArray(cookieLong, buffer, sizeof(buffer), | |
| IS_LITTLE_ENDIAN, 0) < 0) { | |
| Py_DECREF(cookieLong); | |
| return -1; | |
| } | |
| Py_DECREF(cookieLong); | |
| memcpy(&cookie->start_pos, buffer + OFF_START_POS, sizeof(cookie->start_pos)); | |
| memcpy(&cookie->dec_flags, buffer + OFF_DEC_FLAGS, sizeof(cookie->dec_flags)); | |
| memcpy(&cookie->bytes_to_feed, buffer + OFF_BYTES_TO_FEED, sizeof(cookie->bytes_to_feed)); | |
| memcpy(&cookie->chars_to_skip, buffer + OFF_CHARS_TO_SKIP, sizeof(cookie->chars_to_skip)); | |
| memcpy(&cookie->need_eof, buffer + OFF_NEED_EOF, sizeof(cookie->need_eof)); | |
| return 0; | |
| } | |
| static PyObject * | |
| textiowrapper_build_cookie(cookie_type *cookie) | |
| { | |
| unsigned char buffer[COOKIE_BUF_LEN]; | |
| memcpy(buffer + OFF_START_POS, &cookie->start_pos, sizeof(cookie->start_pos)); | |
| memcpy(buffer + OFF_DEC_FLAGS, &cookie->dec_flags, sizeof(cookie->dec_flags)); | |
| memcpy(buffer + OFF_BYTES_TO_FEED, &cookie->bytes_to_feed, sizeof(cookie->bytes_to_feed)); | |
| memcpy(buffer + OFF_CHARS_TO_SKIP, &cookie->chars_to_skip, sizeof(cookie->chars_to_skip)); | |
| memcpy(buffer + OFF_NEED_EOF, &cookie->need_eof, sizeof(cookie->need_eof)); | |
| return _PyLong_FromByteArray(buffer, sizeof(buffer), IS_LITTLE_ENDIAN, 0); | |
| } | |
| #undef IS_LITTLE_ENDIAN | |
| static int | |
| _textiowrapper_decoder_setstate(textio *self, cookie_type *cookie) | |
| { | |
| PyObject *res; | |
| /* When seeking to the start of the stream, we call decoder.reset() | |
| rather than decoder.getstate(). | |
| This is for a few decoders such as utf-16 for which the state value | |
| at start is not (b"", 0) but e.g. (b"", 2) (meaning, in the case of | |
| utf-16, that we are expecting a BOM). | |
| */ | |
| if (cookie->start_pos == 0 && cookie->dec_flags == 0) | |
| res = PyObject_CallMethodObjArgs(self->decoder, _PyIO_str_reset, NULL); | |
| else | |
| res = PyObject_CallMethod(self->decoder, "setstate", | |
| "((si))", "", cookie->dec_flags); | |
| if (res == NULL) | |
| return -1; | |
| Py_DECREF(res); | |
| return 0; | |
| } | |
| static int | |
| _textiowrapper_encoder_setstate(textio *self, cookie_type *cookie) | |
| { | |
| PyObject *res; | |
| /* Same as _textiowrapper_decoder_setstate() above. */ | |
| if (cookie->start_pos == 0 && cookie->dec_flags == 0) { | |
| res = PyObject_CallMethodObjArgs(self->encoder, _PyIO_str_reset, NULL); | |
| self->encoding_start_of_stream = 1; | |
| } | |
| else { | |
| res = PyObject_CallMethodObjArgs(self->encoder, _PyIO_str_setstate, | |
| _PyIO_zero, NULL); | |
| self->encoding_start_of_stream = 0; | |
| } | |
| if (res == NULL) | |
| return -1; | |
| Py_DECREF(res); | |
| return 0; | |
| } | |
| static PyObject * | |
| textiowrapper_seek(textio *self, PyObject *args) | |
| { | |
| PyObject *cookieObj, *posobj; | |
| cookie_type cookie; | |
| int whence = 0; | |
| PyObject *res; | |
| int cmp; | |
| CHECK_INITIALIZED(self); | |
| if (!PyArg_ParseTuple(args, "O|i:seek", &cookieObj, &whence)) | |
| return NULL; | |
| CHECK_CLOSED(self); | |
| Py_INCREF(cookieObj); | |
| if (!self->seekable) { | |
| PyErr_SetString(PyExc_IOError, | |
| "underlying stream is not seekable"); | |
| goto fail; | |
| } | |
| if (whence == 1) { | |
| /* seek relative to current position */ | |
| cmp = PyObject_RichCompareBool(cookieObj, _PyIO_zero, Py_EQ); | |
| if (cmp < 0) | |
| goto fail; | |
| if (cmp == 0) { | |
| PyErr_SetString(PyExc_IOError, | |
| "can't do nonzero cur-relative seeks"); | |
| goto fail; | |
| } | |
| /* Seeking to the current position should attempt to | |
| * sync the underlying buffer with the current position. | |
| */ | |
| Py_DECREF(cookieObj); | |
| cookieObj = PyObject_CallMethod((PyObject *)self, "tell", NULL); | |
| if (cookieObj == NULL) | |
| goto fail; | |
| } | |
| else if (whence == 2) { | |
| /* seek relative to end of file */ | |
| cmp = PyObject_RichCompareBool(cookieObj, _PyIO_zero, Py_EQ); | |
| if (cmp < 0) | |
| goto fail; | |
| if (cmp == 0) { | |
| PyErr_SetString(PyExc_IOError, | |
| "can't do nonzero end-relative seeks"); | |
| goto fail; | |
| } | |
| res = PyObject_CallMethod((PyObject *)self, "flush", NULL); | |
| if (res == NULL) | |
| goto fail; | |
| Py_DECREF(res); | |
| textiowrapper_set_decoded_chars(self, NULL); | |
| Py_CLEAR(self->snapshot); | |
| if (self->decoder) { | |
| res = PyObject_CallMethod(self->decoder, "reset", NULL); | |
| if (res == NULL) | |
| goto fail; | |
| Py_DECREF(res); | |
| } | |
| res = PyObject_CallMethod(self->buffer, "seek", "ii", 0, 2); | |
| Py_XDECREF(cookieObj); | |
| return res; | |
| } | |
| else if (whence != 0) { | |
| PyErr_Format(PyExc_ValueError, | |
| "invalid whence (%d, should be 0, 1 or 2)", whence); | |
| goto fail; | |
| } | |
| cmp = PyObject_RichCompareBool(cookieObj, _PyIO_zero, Py_LT); | |
| if (cmp < 0) | |
| goto fail; | |
| if (cmp == 1) { | |
| PyObject *repr = PyObject_Repr(cookieObj); | |
| if (repr != NULL) { | |
| PyErr_Format(PyExc_ValueError, | |
| "negative seek position %s", | |
| PyString_AS_STRING(repr)); | |
| Py_DECREF(repr); | |
| } | |
| goto fail; | |
| } | |
| res = PyObject_CallMethodObjArgs((PyObject *)self, _PyIO_str_flush, NULL); | |
| if (res == NULL) | |
| goto fail; | |
| Py_DECREF(res); | |
| /* The strategy of seek() is to go back to the safe start point | |
| * and replay the effect of read(chars_to_skip) from there. | |
| */ | |
| if (textiowrapper_parse_cookie(&cookie, cookieObj) < 0) | |
| goto fail; | |
| /* Seek back to the safe start point. */ | |
| posobj = PyLong_FromOff_t(cookie.start_pos); | |
| if (posobj == NULL) | |
| goto fail; | |
| res = PyObject_CallMethodObjArgs(self->buffer, | |
| _PyIO_str_seek, posobj, NULL); | |
| Py_DECREF(posobj); | |
| if (res == NULL) | |
| goto fail; | |
| Py_DECREF(res); | |
| textiowrapper_set_decoded_chars(self, NULL); | |
| Py_CLEAR(self->snapshot); | |
| /* Restore the decoder to its state from the safe start point. */ | |
| if (self->decoder) { | |
| if (_textiowrapper_decoder_setstate(self, &cookie) < 0) | |
| goto fail; | |
| } | |
| if (cookie.chars_to_skip) { | |
| /* Just like _read_chunk, feed the decoder and save a snapshot. */ | |
| PyObject *input_chunk = PyObject_CallMethod( | |
| self->buffer, "read", "i", cookie.bytes_to_feed); | |
| PyObject *decoded; | |
| if (input_chunk == NULL) | |
| goto fail; | |
| assert (PyBytes_Check(input_chunk)); | |
| self->snapshot = Py_BuildValue("iN", cookie.dec_flags, input_chunk); | |
| if (self->snapshot == NULL) { | |
| Py_DECREF(input_chunk); | |
| goto fail; | |
| } | |
| decoded = PyObject_CallMethod(self->decoder, "decode", | |
| "Oi", input_chunk, (int)cookie.need_eof); | |
| if (decoded == NULL) | |
| goto fail; | |
| textiowrapper_set_decoded_chars(self, decoded); | |
| /* Skip chars_to_skip of the decoded characters. */ | |
| if (PyUnicode_GetSize(self->decoded_chars) < cookie.chars_to_skip) { | |
| PyErr_SetString(PyExc_IOError, "can't restore logical file position"); | |
| goto fail; | |
| } | |
| self->decoded_chars_used = cookie.chars_to_skip; | |
| } | |
| else { | |
| self->snapshot = Py_BuildValue("is", cookie.dec_flags, ""); | |
| if (self->snapshot == NULL) | |
| goto fail; | |
| } | |
| /* Finally, reset the encoder (merely useful for proper BOM handling) */ | |
| if (self->encoder) { | |
| if (_textiowrapper_encoder_setstate(self, &cookie) < 0) | |
| goto fail; | |
| } | |
| return cookieObj; | |
| fail: | |
| Py_XDECREF(cookieObj); | |
| return NULL; | |
| } | |
| static PyObject * | |
| textiowrapper_tell(textio *self, PyObject *args) | |
| { | |
| PyObject *res; | |
| PyObject *posobj = NULL; | |
| cookie_type cookie = {0,0,0,0,0}; | |
| PyObject *next_input; | |
| Py_ssize_t chars_to_skip, chars_decoded; | |
| PyObject *saved_state = NULL; | |
| char *input, *input_end; | |
| CHECK_INITIALIZED(self); | |
| CHECK_CLOSED(self); | |
| if (!self->seekable) { | |
| PyErr_SetString(PyExc_IOError, | |
| "underlying stream is not seekable"); | |
| goto fail; | |
| } | |
| if (!self->telling) { | |
| PyErr_SetString(PyExc_IOError, | |
| "telling position disabled by next() call"); | |
| goto fail; | |
| } | |
| if (_textiowrapper_writeflush(self) < 0) | |
| return NULL; | |
| res = PyObject_CallMethod((PyObject *)self, "flush", NULL); | |
| if (res == NULL) | |
| goto fail; | |
| Py_DECREF(res); | |
| posobj = PyObject_CallMethod(self->buffer, "tell", NULL); | |
| if (posobj == NULL) | |
| goto fail; | |
| if (self->decoder == NULL || self->snapshot == NULL) { | |
| assert (self->decoded_chars == NULL || PyUnicode_GetSize(self->decoded_chars) == 0); | |
| return posobj; | |
| } | |
| #if defined(HAVE_LARGEFILE_SUPPORT) | |
| cookie.start_pos = PyLong_AsLongLong(posobj); | |
| #else | |
| cookie.start_pos = PyLong_AsLong(posobj); | |
| #endif | |
| if (PyErr_Occurred()) | |
| goto fail; | |
| /* Skip backward to the snapshot point (see _read_chunk). */ | |
| if (!PyArg_Parse(self->snapshot, "(iO)", &cookie.dec_flags, &next_input)) | |
| goto fail; | |
| assert (PyBytes_Check(next_input)); | |
| cookie.start_pos -= PyBytes_GET_SIZE(next_input); | |
| /* How many decoded characters have been used up since the snapshot? */ | |
| if (self->decoded_chars_used == 0) { | |
| /* We haven't moved from the snapshot point. */ | |
| Py_DECREF(posobj); | |
| return textiowrapper_build_cookie(&cookie); | |
| } | |
| chars_to_skip = self->decoded_chars_used; | |
| /* Starting from the snapshot position, we will walk the decoder | |
| * forward until it gives us enough decoded characters. | |
| */ | |
| saved_state = PyObject_CallMethodObjArgs(self->decoder, | |
| _PyIO_str_getstate, NULL); | |
| if (saved_state == NULL) | |
| goto fail; | |
| /* Note our initial start point. */ | |
| if (_textiowrapper_decoder_setstate(self, &cookie) < 0) | |
| goto fail; | |
| /* Feed the decoder one byte at a time. As we go, note the | |
| * nearest "safe start point" before the current location | |
| * (a point where the decoder has nothing buffered, so seek() | |
| * can safely start from there and advance to this location). | |
| */ | |
| chars_decoded = 0; | |
| input = PyBytes_AS_STRING(next_input); | |
| input_end = input + PyBytes_GET_SIZE(next_input); | |
| while (input < input_end) { | |
| PyObject *state; | |
| char *dec_buffer; | |
| Py_ssize_t dec_buffer_len; | |
| int dec_flags; | |
| PyObject *decoded = PyObject_CallMethod( | |
| self->decoder, "decode", "s#", input, 1); | |
| if (decoded == NULL) | |
| goto fail; | |
| assert (PyUnicode_Check(decoded)); | |
| chars_decoded += PyUnicode_GET_SIZE(decoded); | |
| Py_DECREF(decoded); | |
| cookie.bytes_to_feed += 1; | |
| state = PyObject_CallMethodObjArgs(self->decoder, | |
| _PyIO_str_getstate, NULL); | |
| if (state == NULL) | |
| goto fail; | |
| if (!PyArg_Parse(state, "(s#i)", &dec_buffer, &dec_buffer_len, &dec_flags)) { | |
| Py_DECREF(state); | |
| goto fail; | |
| } | |
| Py_DECREF(state); | |
| if (dec_buffer_len == 0 && chars_decoded <= chars_to_skip) { | |
| /* Decoder buffer is empty, so this is a safe start point. */ | |
| cookie.start_pos += cookie.bytes_to_feed; | |
| chars_to_skip -= chars_decoded; | |
| cookie.dec_flags = dec_flags; | |
| cookie.bytes_to_feed = 0; | |
| chars_decoded = 0; | |
| } | |
| if (chars_decoded >= chars_to_skip) | |
| break; | |
| input++; | |
| } | |
| if (input == input_end) { | |
| /* We didn't get enough decoded data; signal EOF to get more. */ | |
| PyObject *decoded = PyObject_CallMethod( | |
| self->decoder, "decode", "si", "", /* final = */ 1); | |
| if (decoded == NULL) | |
| goto fail; | |
| assert (PyUnicode_Check(decoded)); | |
| chars_decoded += PyUnicode_GET_SIZE(decoded); | |
| Py_DECREF(decoded); | |
| cookie.need_eof = 1; | |
| if (chars_decoded < chars_to_skip) { | |
| PyErr_SetString(PyExc_IOError, | |
| "can't reconstruct logical file position"); | |
| goto fail; | |
| } | |
| } | |
| /* finally */ | |
| Py_XDECREF(posobj); | |
| res = PyObject_CallMethod(self->decoder, "setstate", "(O)", saved_state); | |
| Py_DECREF(saved_state); | |
| if (res == NULL) | |
| return NULL; | |
| Py_DECREF(res); | |
| /* The returned cookie corresponds to the last safe start point. */ | |
| cookie.chars_to_skip = Py_SAFE_DOWNCAST(chars_to_skip, Py_ssize_t, int); | |
| return textiowrapper_build_cookie(&cookie); | |
| fail: | |
| Py_XDECREF(posobj); | |
| if (saved_state) { | |
| PyObject *type, *value, *traceback; | |
| PyErr_Fetch(&type, &value, &traceback); | |
| res = PyObject_CallMethod(self->decoder, "setstate", "(O)", saved_state); | |
| Py_DECREF(saved_state); | |
| if (res == NULL) | |
| return NULL; | |
| Py_DECREF(res); | |
| PyErr_Restore(type, value, traceback); | |
| } | |
| return NULL; | |
| } | |
| static PyObject * | |
| textiowrapper_truncate(textio *self, PyObject *args) | |
| { | |
| PyObject *pos = Py_None; | |
| PyObject *res; | |
| CHECK_INITIALIZED(self) | |
| if (!PyArg_ParseTuple(args, "|O:truncate", &pos)) { | |
| return NULL; | |
| } | |
| res = PyObject_CallMethodObjArgs((PyObject *) self, _PyIO_str_flush, NULL); | |
| if (res == NULL) | |
| return NULL; | |
| Py_DECREF(res); | |
| return PyObject_CallMethodObjArgs(self->buffer, _PyIO_str_truncate, pos, NULL); | |
| } | |
| static PyObject * | |
| textiowrapper_repr(textio *self) | |
| { | |
| PyObject *nameobj, *res; | |
| PyObject *namerepr = NULL, *encrepr = NULL; | |
| CHECK_INITIALIZED(self); | |
| nameobj = PyObject_GetAttrString((PyObject *) self, "name"); | |
| if (nameobj == NULL) { | |
| if (PyErr_ExceptionMatches(PyExc_AttributeError)) | |
| PyErr_Clear(); | |
| else | |
| goto error; | |
| encrepr = PyObject_Repr(self->encoding); | |
| res = PyString_FromFormat("<_io.TextIOWrapper encoding=%s>", | |
| PyString_AS_STRING(encrepr)); | |
| } | |
| else { | |
| encrepr = PyObject_Repr(self->encoding); | |
| namerepr = PyObject_Repr(nameobj); | |
| res = PyString_FromFormat("<_io.TextIOWrapper name=%s encoding=%s>", | |
| PyString_AS_STRING(namerepr), | |
| PyString_AS_STRING(encrepr)); | |
| Py_DECREF(nameobj); | |
| } | |
| Py_XDECREF(namerepr); | |
| Py_XDECREF(encrepr); | |
| return res; | |
| error: | |
| Py_XDECREF(namerepr); | |
| Py_XDECREF(encrepr); | |
| return NULL; | |
| } | |
| /* Inquiries */ | |
| static PyObject * | |
| textiowrapper_fileno(textio *self, PyObject *args) | |
| { | |
| CHECK_INITIALIZED(self); | |
| return PyObject_CallMethod(self->buffer, "fileno", NULL); | |
| } | |
| static PyObject * | |
| textiowrapper_seekable(textio *self, PyObject *args) | |
| { | |
| CHECK_INITIALIZED(self); | |
| return PyObject_CallMethod(self->buffer, "seekable", NULL); | |
| } | |
| static PyObject * | |
| textiowrapper_readable(textio *self, PyObject *args) | |
| { | |
| CHECK_INITIALIZED(self); | |
| return PyObject_CallMethod(self->buffer, "readable", NULL); | |
| } | |
| static PyObject * | |
| textiowrapper_writable(textio *self, PyObject *args) | |
| { | |
| CHECK_INITIALIZED(self); | |
| return PyObject_CallMethod(self->buffer, "writable", NULL); | |
| } | |
| static PyObject * | |
| textiowrapper_isatty(textio *self, PyObject *args) | |
| { | |
| CHECK_INITIALIZED(self); | |
| return PyObject_CallMethod(self->buffer, "isatty", NULL); | |
| } | |
| static PyObject * | |
| textiowrapper_flush(textio *self, PyObject *args) | |
| { | |
| CHECK_INITIALIZED(self); | |
| CHECK_CLOSED(self); | |
| self->telling = self->seekable; | |
| if (_textiowrapper_writeflush(self) < 0) | |
| return NULL; | |
| return PyObject_CallMethod(self->buffer, "flush", NULL); | |
| } | |
| static PyObject * | |
| textiowrapper_close(textio *self, PyObject *args) | |
| { | |
| PyObject *res; | |
| int r; | |
| CHECK_INITIALIZED(self); | |
| res = textiowrapper_closed_get(self, NULL); | |
| if (res == NULL) | |
| return NULL; | |
| r = PyObject_IsTrue(res); | |
| Py_DECREF(res); | |
| if (r < 0) | |
| return NULL; | |
| if (r > 0) { | |
| Py_RETURN_NONE; /* stream already closed */ | |
| } | |
| else { | |
| res = PyObject_CallMethod((PyObject *)self, "flush", NULL); | |
| if (res == NULL) { | |
| return NULL; | |
| } | |
| else | |
| Py_DECREF(res); | |
| return PyObject_CallMethod(self->buffer, "close", NULL); | |
| } | |
| } | |
| static PyObject * | |
| textiowrapper_iternext(textio *self) | |
| { | |
| PyObject *line; | |
| CHECK_INITIALIZED(self); | |
| self->telling = 0; | |
| if (Py_TYPE(self) == &PyTextIOWrapper_Type) { | |
| /* Skip method call overhead for speed */ | |
| line = _textiowrapper_readline(self, -1); | |
| } | |
| else { | |
| line = PyObject_CallMethodObjArgs((PyObject *)self, | |
| _PyIO_str_readline, NULL); | |
| if (line && !PyUnicode_Check(line)) { | |
| PyErr_Format(PyExc_IOError, | |
| "readline() should have returned an str object, " | |
| "not '%.200s'", Py_TYPE(line)->tp_name); | |
| Py_DECREF(line); | |
| return NULL; | |
| } | |
| } | |
| if (line == NULL) | |
| return NULL; | |
| if (PyUnicode_GET_SIZE(line) == 0) { | |
| /* Reached EOF or would have blocked */ | |
| Py_DECREF(line); | |
| Py_CLEAR(self->snapshot); | |
| self->telling = self->seekable; | |
| return NULL; | |
| } | |
| return line; | |
| } | |
| static PyObject * | |
| textiowrapper_name_get(textio *self, void *context) | |
| { | |
| CHECK_INITIALIZED(self); | |
| return PyObject_GetAttrString(self->buffer, "name"); | |
| } | |
| static PyObject * | |
| textiowrapper_closed_get(textio *self, void *context) | |
| { | |
| CHECK_INITIALIZED(self); | |
| return PyObject_GetAttr(self->buffer, _PyIO_str_closed); | |
| } | |
| static PyObject * | |
| textiowrapper_newlines_get(textio *self, void *context) | |
| { | |
| PyObject *res; | |
| CHECK_INITIALIZED(self); | |
| if (self->decoder == NULL) | |
| Py_RETURN_NONE; | |
| res = PyObject_GetAttr(self->decoder, _PyIO_str_newlines); | |
| if (res == NULL) { | |
| if (PyErr_ExceptionMatches(PyExc_AttributeError)) { | |
| PyErr_Clear(); | |
| Py_RETURN_NONE; | |
| } | |
| else { | |
| return NULL; | |
| } | |
| } | |
| return res; | |
| } | |
| static PyObject * | |
| textiowrapper_errors_get(textio *self, void *context) | |
| { | |
| CHECK_INITIALIZED(self); | |
| Py_INCREF(self->errors); | |
| return self->errors; | |
| } | |
| static PyObject * | |
| textiowrapper_chunk_size_get(textio *self, void *context) | |
| { | |
| CHECK_INITIALIZED(self); | |
| return PyLong_FromSsize_t(self->chunk_size); | |
| } | |
| static int | |
| textiowrapper_chunk_size_set(textio *self, PyObject *arg, void *context) | |
| { | |
| Py_ssize_t n; | |
| CHECK_INITIALIZED_INT(self); | |
| n = PyNumber_AsSsize_t(arg, PyExc_TypeError); | |
| if (n == -1 && PyErr_Occurred()) | |
| return -1; | |
| if (n <= 0) { | |
| PyErr_SetString(PyExc_ValueError, | |
| "a strictly positive integer is required"); | |
| return -1; | |
| } | |
| self->chunk_size = n; | |
| return 0; | |
| } | |
| static PyMethodDef textiowrapper_methods[] = { | |
| {"detach", (PyCFunction)textiowrapper_detach, METH_NOARGS}, | |
| {"write", (PyCFunction)textiowrapper_write, METH_VARARGS}, | |
| {"read", (PyCFunction)textiowrapper_read, METH_VARARGS}, | |
| {"readline", (PyCFunction)textiowrapper_readline, METH_VARARGS}, | |
| {"flush", (PyCFunction)textiowrapper_flush, METH_NOARGS}, | |
| {"close", (PyCFunction)textiowrapper_close, METH_NOARGS}, | |
| {"fileno", (PyCFunction)textiowrapper_fileno, METH_NOARGS}, | |
| {"seekable", (PyCFunction)textiowrapper_seekable, METH_NOARGS}, | |
| {"readable", (PyCFunction)textiowrapper_readable, METH_NOARGS}, | |
| {"writable", (PyCFunction)textiowrapper_writable, METH_NOARGS}, | |
| {"isatty", (PyCFunction)textiowrapper_isatty, METH_NOARGS}, | |
| {"seek", (PyCFunction)textiowrapper_seek, METH_VARARGS}, | |
| {"tell", (PyCFunction)textiowrapper_tell, METH_NOARGS}, | |
| {"truncate", (PyCFunction)textiowrapper_truncate, METH_VARARGS}, | |
| {NULL, NULL} | |
| }; | |
| static PyMemberDef textiowrapper_members[] = { | |
| {"encoding", T_OBJECT, offsetof(textio, encoding), READONLY}, | |
| {"buffer", T_OBJECT, offsetof(textio, buffer), READONLY}, | |
| {"line_buffering", T_BOOL, offsetof(textio, line_buffering), READONLY}, | |
| {NULL} | |
| }; | |
| static PyGetSetDef textiowrapper_getset[] = { | |
| {"name", (getter)textiowrapper_name_get, NULL, NULL}, | |
| {"closed", (getter)textiowrapper_closed_get, NULL, NULL}, | |
| /* {"mode", (getter)TextIOWrapper_mode_get, NULL, NULL}, | |
| */ | |
| {"newlines", (getter)textiowrapper_newlines_get, NULL, NULL}, | |
| {"errors", (getter)textiowrapper_errors_get, NULL, NULL}, | |
| {"_CHUNK_SIZE", (getter)textiowrapper_chunk_size_get, | |
| (setter)textiowrapper_chunk_size_set, NULL}, | |
| {NULL} | |
| }; | |
| PyTypeObject PyTextIOWrapper_Type = { | |
| PyVarObject_HEAD_INIT(NULL, 0) | |
| "_io.TextIOWrapper", /*tp_name*/ | |
| sizeof(textio), /*tp_basicsize*/ | |
| 0, /*tp_itemsize*/ | |
| (destructor)textiowrapper_dealloc, /*tp_dealloc*/ | |
| 0, /*tp_print*/ | |
| 0, /*tp_getattr*/ | |
| 0, /*tps_etattr*/ | |
| 0, /*tp_compare */ | |
| (reprfunc)textiowrapper_repr,/*tp_repr*/ | |
| 0, /*tp_as_number*/ | |
| 0, /*tp_as_sequence*/ | |
| 0, /*tp_as_mapping*/ | |
| 0, /*tp_hash */ | |
| 0, /*tp_call*/ | |
| 0, /*tp_str*/ | |
| 0, /*tp_getattro*/ | |
| 0, /*tp_setattro*/ | |
| 0, /*tp_as_buffer*/ | |
| Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | |
| | Py_TPFLAGS_HAVE_GC, /*tp_flags*/ | |
| textiowrapper_doc, /* tp_doc */ | |
| (traverseproc)textiowrapper_traverse, /* tp_traverse */ | |
| (inquiry)textiowrapper_clear, /* tp_clear */ | |
| 0, /* tp_richcompare */ | |
| offsetof(textio, weakreflist), /*tp_weaklistoffset*/ | |
| 0, /* tp_iter */ | |
| (iternextfunc)textiowrapper_iternext, /* tp_iternext */ | |
| textiowrapper_methods, /* tp_methods */ | |
| textiowrapper_members, /* tp_members */ | |
| textiowrapper_getset, /* tp_getset */ | |
| 0, /* tp_base */ | |
| 0, /* tp_dict */ | |
| 0, /* tp_descr_get */ | |
| 0, /* tp_descr_set */ | |
| offsetof(textio, dict), /*tp_dictoffset*/ | |
| (initproc)textiowrapper_init, /* tp_init */ | |
| 0, /* tp_alloc */ | |
| PyType_GenericNew, /* tp_new */ | |
| }; |