[Numpy-svn] r4005 - branches/py3k/Modules
numpy-svn at scipy.org
numpy-svn at scipy.org
Fri Aug 24 16:04:14 EDT 2007
Author: chris.burns
Date: 2007-08-24 15:04:08 -0500 (Fri, 24 Aug 2007)
New Revision: 4005
Added:
branches/py3k/Modules/_struct.c
Log:
Add the struct module source. Mostly consists of edits by Travis. Travis emailed me this code prior to the Google Sprint. May have a few of my edits.
Added: branches/py3k/Modules/_struct.c
===================================================================
--- branches/py3k/Modules/_struct.c 2007-08-24 19:54:12 UTC (rev 4004)
+++ branches/py3k/Modules/_struct.c 2007-08-24 20:04:08 UTC (rev 4005)
@@ -0,0 +1,2157 @@
+
+/* struct module -- pack values into and (out of) strings */
+
+/* New version supporting byte order, alignment and size options,
+ character strings, and unsigned numbers */
+
+#define PY_SSIZE_T_CLEAN
+
+#include "Python.h"
+#include "structseq.h"
+#include "structmember.h"
+#include <ctype.h>
+
+static PyTypeObject PyStructType;
+static PyTypeObject PyFieldTupleType;
+
+/* If PY_STRUCT_OVERFLOW_MASKING is defined, the struct module will wrap all input
+ numbers for explicit endians such that they fit in the given type, much
+ like explicit casting in C. A warning will be raised if the number did
+ not originally fit within the range of the requested type. If it is
+ not defined, then all range errors and overflow will be struct.error
+ exceptions. */
+
+#define PY_STRUCT_OVERFLOW_MASKING 1
+
+#ifdef PY_STRUCT_OVERFLOW_MASKING
+static PyObject *pylong_ulong_mask = NULL;
+static PyObject *pyint_zero = NULL;
+#endif
+
+/* If PY_STRUCT_FLOAT_COERCE is defined, the struct module will allow float
+ arguments for integer formats with a warning for backwards
+ compatibility. */
+
+#define PY_STRUCT_FLOAT_COERCE 1
+
+#ifdef PY_STRUCT_FLOAT_COERCE
+#define FLOAT_COERCE "integer argument expected, got float"
+#endif
+
+/* Native is default
+ If F_LE or F_BE is set, then alignment
+ information should not be used.
+*/
+#define F_LE 0x0100
+#define F_BE 0x0200
+#define F_BIT 0x0400
+#define F_PTR 0x0800
+#define F_CMPLX 0x1000
+#define F_STRUCT 0x2000
+#define F_ARRAY 0x4000
+#define F_FUNCPTR 0x8000
+#define F_BITMASK 0x00FF /* storage in FLAG for bit-offset */
+
+#define F_IS_NATIVE(c) ((((const _formatcode *)(c))->flags & (F_LE||F_BE))==0)
+#define F_IS_LE(c) ((((const _formatcode *)(c))->flags & F_LE) == F_LE)
+#define F_IS_BE(c) ((((const _formatcode *)(c))->flags & F_BE) == F_BE)
+
+struct forward _formatcode;
+
+/* The translation function for each format character is table driven */
+typedef struct _formatdef {
+ char format;
+ Py_ssize_t size;
+ Py_ssize_t stdsize;
+ Py_ssize_t alignment;
+ PyObject* (*unpack)(const char *,
+ const struct _formatdef *,
+ const struct _formatcode *);
+ int (*pack)(char *, PyObject *,
+ const struct _formatdef *,
+ const struct _formatcode *);
+} formatdef;
+
+typedef struct _formatcode {
+ const struct _formatdef *fmtdef; /* format information */
+ Py_ssize_t offset; /* offset into the data area
+ relative to the start of
+ this structure */
+ Py_ssize_t size; /* size of the data implied */
+ char *name; /* field name of this code */
+ int flags; /* ISBIT, ISPTR, ISSTRUCT,
+ ISCMPLX, ISFUNCPTR, ISARRAY */
+ void *ptr;
+
+ /* several possibilities:
+
+ pointer to a format code pointer, complex, array
+ pointer to a StructObject struct, function pointer
+
+ in case of function pointer, the structure represents
+ the function arguments (last one represents return type).
+ */
+} formatcode;
+
+/* This format code has extra fields for shape information but it is
+ binary compatible with the formatcode.
+*/
+
+typedef struct _arraycode {
+ formatcode code;
+ int ndims;
+ Py_ssize_t *shape;
+} arraycode;
+
+/* Struct object interface */
+
+typedef struct _structobject {
+ PyObject_HEAD
+ Py_ssize_t s_size; /* The byte-size the data-string */
+ Py_ssize_t s_len; /* Number of codes */
+ formatcode *s_codes; /* Pointer to array of codes */
+ PyObject *s_format; /* Python format string */
+ PyObject *weakreflist; /* List of weak references */
+} PyStructObject;
+
+
+typedef struct _fieldtupleobject {
+ PyTupleObject tup;
+ char **names; /* array of strings with names of the fields */
+} PyFieldTupleObject;
+
+#define PyStruct_Check(op) PyObject_TypeCheck(op, &PyStructType)
+#define PyStruct_CheckExact(op) ((op)->ob_type == &PyStructType)
+
+#define PyFieldTuple_Check(op) PyObject_TypeCheck(op, &PyFieldTuple_Check)
+#define PyFieldTuple_CheckExact(op) ((op)->ob_type == &PyFieldTuple_Check)
+
+
+/* Exception */
+
+static PyObject *StructError;
+
+
+/* Define various structs to figure out the alignments of types */
+
+
+typedef struct { char c; short x; } st_short;
+typedef struct { char c; int x; } st_int;
+typedef struct { char c; long x; } st_long;
+typedef struct { char c; float x; } st_float;
+typedef struct { char c; double x; } st_double;
+typedef struct { char c; long double x;} st_longdouble;
+typedef struct { char c; void *x; } st_void_p;
+
+#define SHORT_ALIGN (sizeof(st_short) - sizeof(short))
+#define INT_ALIGN (sizeof(st_int) - sizeof(int))
+#define LONG_ALIGN (sizeof(st_long) - sizeof(long))
+#define FLOAT_ALIGN (sizeof(st_float) - sizeof(float))
+#define DOUBLE_ALIGN (sizeof(st_double) - sizeof(double))
+#define VOID_P_ALIGN (sizeof(st_void_p) - sizeof(void *))
+
+/* We can't support q and Q in native mode unless the compiler does;
+ in std mode, they're 8 bytes on all platforms. */
+#ifdef HAVE_LONG_LONG
+typedef struct { char c; PY_LONG_LONG x; } s_long_long;
+#define LONG_LONG_ALIGN (sizeof(s_long_long) - sizeof(PY_LONG_LONG))
+#endif
+
+/* Long double in native mode is platform dependent.
+ in std mode they're 16 bytes on all platforms
+ */
+#ifdef HAVE_LONG_DOUBLE
+typedef struct { char c; PY_LONG_LONG x; } s_long_double;
+#define LONG_DOUBLE_ALIGN (sizeof(s_long_double) - sizeof(long double))
+#endif
+
+#ifdef HAVE_C99_BOOL
+#define BOOL_TYPE _Bool
+typedef struct { char c; _Bool x; } s_bool;
+#define BOOL_ALIGN (sizeof(s_bool) - sizeof(BOOL_TYPE))
+#else
+#define BOOL_TYPE char
+#define BOOL_ALIGN 0
+#endif
+
+#define STRINGIFY(x) #x
+
+#ifdef __powerc
+#pragma options align=reset
+#endif
+
+/* Helper to get a PyLongObject by hook or by crook. Caller should decref. */
+
+static PyObject *
+get_pylong(PyObject *v)
+{
+ PyNumberMethods *m;
+
+ assert(v != NULL);
+ if (PyLong_Check(v)) {
+ Py_INCREF(v);
+ return v;
+ }
+ m = v->ob_type->tp_as_number;
+ if (m != NULL && m->nb_long != NULL) {
+ v = m->nb_long(v);
+ if (v == NULL)
+ return NULL;
+ if (PyLong_Check(v))
+ return v;
+ Py_DECREF(v);
+ }
+ PyErr_SetString(StructError,
+ "cannot convert argument to long");
+ return NULL;
+}
+
+/* Helper routine to get a Python integer and raise the appropriate error
+ if it isn't one */
+
+static int
+get_long(PyObject *v, long *p)
+{
+ long x = PyInt_AsLong(v);
+ if (x == -1 && PyErr_Occurred()) {
+#ifdef PY_STRUCT_FLOAT_COERCE
+ if (PyFloat_Check(v)) {
+ PyObject *o;
+ int res;
+ PyErr_Clear();
+ if (PyErr_WarnEx(PyExc_DeprecationWarning, FLOAT_COERCE, 2) < 0)
+ return -1;
+ o = PyNumber_Int(v);
+ if (o == NULL)
+ return -1;
+ res = get_long(o, p);
+ Py_DECREF(o);
+ return res;
+ }
+#endif
+ if (PyErr_ExceptionMatches(PyExc_TypeError))
+ PyErr_SetString(StructError,
+ "required argument is not an integer");
+ return -1;
+ }
+ *p = x;
+ return 0;
+}
+
+
+/* Same, but handling unsigned long */
+
+static int
+get_ulong(PyObject *v, unsigned long *p)
+{
+ if (PyLong_Check(v)) {
+ unsigned long x = PyLong_AsUnsignedLong(v);
+ if (x == (unsigned long)(-1) && PyErr_Occurred())
+ return -1;
+ *p = x;
+ return 0;
+ }
+ if (get_long(v, (long *)p) < 0)
+ return -1;
+ if (((long)*p) < 0) {
+ PyErr_SetString(StructError,
+ "unsigned argument is < 0");
+ return -1;
+ }
+ return 0;
+}
+
+#ifdef HAVE_LONG_LONG
+
+/* Same, but handling native long long. */
+
+static int
+get_longlong(PyObject *v, PY_LONG_LONG *p)
+{
+ PY_LONG_LONG x;
+
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ assert(PyLong_Check(v));
+ x = PyLong_AsLongLong(v);
+ Py_DECREF(v);
+ if (x == (PY_LONG_LONG)-1 && PyErr_Occurred())
+ return -1;
+ *p = x;
+ return 0;
+}
+
+/* Same, but handling native unsigned long long. */
+
+static int
+get_ulonglong(PyObject *v, unsigned PY_LONG_LONG *p)
+{
+ unsigned PY_LONG_LONG x;
+
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ assert(PyLong_Check(v));
+ x = PyLong_AsUnsignedLongLong(v);
+ Py_DECREF(v);
+ if (x == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())
+ return -1;
+ *p = x;
+ return 0;
+}
+
+#endif
+
+#ifdef PY_STRUCT_OVERFLOW_MASKING
+
+/* Helper routine to get a Python integer and raise the appropriate error
+ if it isn't one */
+
+#define INT_OVERFLOW "struct integer overflow masking is deprecated"
+
+static int
+get_wrapped_long(PyObject *v, long *p)
+{
+ if (get_long(v, p) < 0) {
+ if (PyLong_Check(v) &&
+ PyErr_ExceptionMatches(PyExc_OverflowError)) {
+ PyObject *wrapped;
+ long x;
+ PyErr_Clear();
+#ifdef PY_STRUCT_FLOAT_COERCE
+ if (PyFloat_Check(v)) {
+ PyObject *o;
+ int res;
+ PyErr_Clear();
+ if (PyErr_WarnEx(PyExc_DeprecationWarning, FLOAT_COERCE, 2) < 0)
+ return -1;
+ o = PyNumber_Int(v);
+ if (o == NULL)
+ return -1;
+ res = get_wrapped_long(o, p);
+ Py_DECREF(o);
+ return res;
+ }
+#endif
+ if (PyErr_WarnEx(PyExc_DeprecationWarning, INT_OVERFLOW, 2) < 0)
+ return -1;
+ wrapped = PyNumber_And(v, pylong_ulong_mask);
+ if (wrapped == NULL)
+ return -1;
+ x = (long)PyLong_AsUnsignedLong(wrapped);
+ Py_DECREF(wrapped);
+ if (x == -1 && PyErr_Occurred())
+ return -1;
+ *p = x;
+ } else {
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static int
+get_wrapped_ulong(PyObject *v, unsigned long *p)
+{
+ long x = (long)PyLong_AsUnsignedLong(v);
+ if (x == -1 && PyErr_Occurred()) {
+ PyObject *wrapped;
+ PyErr_Clear();
+#ifdef PY_STRUCT_FLOAT_COERCE
+ if (PyFloat_Check(v)) {
+ PyObject *o;
+ int res;
+ PyErr_Clear();
+ if (PyErr_WarnEx(PyExc_DeprecationWarning, FLOAT_COERCE, 2) < 0)
+ return -1;
+ o = PyNumber_Int(v);
+ if (o == NULL)
+ return -1;
+ res = get_wrapped_ulong(o, p);
+ Py_DECREF(o);
+ return res;
+ }
+#endif
+ wrapped = PyNumber_And(v, pylong_ulong_mask);
+ if (wrapped == NULL)
+ return -1;
+ if (PyErr_WarnEx(PyExc_DeprecationWarning, INT_OVERFLOW, 2) < 0) {
+ Py_DECREF(wrapped);
+ return -1;
+ }
+ x = (long)PyLong_AsUnsignedLong(wrapped);
+ Py_DECREF(wrapped);
+ if (x == -1 && PyErr_Occurred())
+ return -1;
+ }
+ *p = (unsigned long)x;
+ return 0;
+}
+
+#define RANGE_ERROR(x, f, flag, mask) \
+ do { \
+ if (_range_error(f, flag) < 0) \
+ return -1; \
+ else \
+ (x) &= (mask); \
+ } while (0)
+
+#else
+
+#define get_wrapped_long get_long
+#define get_wrapped_ulong get_ulong
+#define RANGE_ERROR(x, f, flag, mask) return _range_error(f, flag)
+
+#endif
+
+/* Floating point helpers */
+
+static PyObject *
+unpack_float(const char *p, /* start of 4-byte string */
+ int le) /* true for little-endian, false for big-endian */
+{
+ double x;
+
+ x = _PyFloat_Unpack4((unsigned char *)p, le);
+ if (x == -1.0 && PyErr_Occurred())
+ return NULL;
+ return PyFloat_FromDouble(x);
+}
+
+static PyObject *
+unpack_double(const char *p, /* start of 8-byte string */
+ int le) /* true for little-endian, false for big-endian */
+{
+ double x;
+
+ x = _PyFloat_Unpack8((unsigned char *)p, le);
+ if (x == -1.0 && PyErr_Occurred())
+ return NULL;
+ return PyFloat_FromDouble(x);
+}
+
+/* Helper to format the range error exceptions */
+static int
+_range_error(const formatdef *f, int is_unsigned)
+{
+ /* ulargest is the largest unsigned value with f->size bytes.
+ * Note that the simpler:
+ * ((size_t)1 << (f->size * 8)) - 1
+ * doesn't work when f->size == sizeof(size_t) because C doesn't
+ * define what happens when a left shift count is >= the number of
+ * bits in the integer being shifted; e.g., on some boxes it doesn't
+ * shift at all when they're equal.
+ */
+ const size_t ulargest = (size_t)-1 >> ((SIZEOF_SIZE_T - f->size)*8);
+ assert(f->size >= 1 && f->size <= SIZEOF_SIZE_T);
+ if (is_unsigned)
+ PyErr_Format(StructError,
+ "'%c' format requires 0 <= number <= %zu",
+ f->format,
+ ulargest);
+ else {
+ const Py_ssize_t largest = (Py_ssize_t)(ulargest >> 1);
+ PyErr_Format(StructError,
+ "'%c' format requires %zd <= number <= %zd",
+ f->format,
+ ~ largest,
+ largest);
+ }
+#ifdef PY_STRUCT_OVERFLOW_MASKING
+ {
+ PyObject *ptype, *pvalue, *ptraceback;
+ PyObject *msg;
+ int rval;
+ PyErr_Fetch(&ptype, &pvalue, &ptraceback);
+ assert(pvalue != NULL);
+ msg = PyObject_Str(pvalue);
+ Py_XDECREF(ptype);
+ Py_XDECREF(pvalue);
+ Py_XDECREF(ptraceback);
+ if (msg == NULL)
+ return -1;
+ rval = PyErr_WarnEx(PyExc_DeprecationWarning,
+ PyString_AS_STRING(msg), 2);
+ Py_DECREF(msg);
+ if (rval == 0)
+ return 0;
+ }
+#endif
+ return -1;
+}
+
+static PyObject *
+u_bit(const char *p, const formatdef *f, const formatcode *c)
+{
+ return NULL;
+}
+
+static int
+p_bit(char *p, PyObject *obj, const struct _formatdef *f,
+ const struct _formatcode *c)
+{
+ return 0;
+}
+
+
+static PyObject *
+u_byte(const char *p, const formatdef *f, const formatcode *c)
+{
+ return PyInt_FromLong((long) *(signed char *)p);
+}
+
+static int
+p_byte(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+ long x;
+ if (get_long(v, &x) < 0)
+ return -1;
+ if (x < -128 || x > 127){
+ PyErr_SetString(StructError,
+ "byte format requires -128 <= number <= 127");
+ return -1;
+ }
+ *p = (char)x;
+ return 0;
+}
+
+static PyObject *
+u_ubyte(const char *p, const formatdef *f, const formatcode *c)
+{
+ return PyInt_FromLong((long) *(unsigned char *)p);
+}
+
+
+static int
+p_ubyte(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+ long x;
+ if (get_long(v, &x) < 0)
+ return -1;
+ if (x < 0 || x > 255){
+ PyErr_SetString(StructError,
+ "ubyte format requires 0 <= number <= 255");
+ return -1;
+ }
+ *p = (char)x;
+ return 0;
+}
+
+
+static PyObject *
+u_char(const char *p, const formatdef *f, const formatcode *c)
+{
+ return PyString_FromStringAndSize(p, 1);
+}
+
+
+static int
+p_char(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+ if (!PyString_Check(v) || PyString_Size(v) != 1) {
+ PyErr_SetString(StructError,
+ "char format require string of length 1");
+ return -1;
+ }
+ *p = *PyString_AsString(v);
+ return 0;
+}
+
+
+/***************
+
+HELPER ROUTINES for big-endian un-packing
+
+******************/
+
+static PyObject *
+bu_int(const char *p, const formatdef *f)
+{
+ long x = 0;
+ Py_ssize_t i = f->stdsize;
+ const unsigned char *bytes = (const unsigned char *)p;
+ do {
+ x = (x<<8) | *bytes++;
+ } while (--i > 0);
+ /* Extend the sign bit. */
+ if (SIZEOF_LONG > f->size)
+ x |= -(x & (1L << ((8 * f->size) - 1)));
+ return PyInt_FromLong(x);
+}
+
+static PyObject *
+bu_uint(const char *p, const formatdef *f)
+{
+ unsigned long x = 0;
+ Py_ssize_t i = f->stdsize;
+ const unsigned char *bytes = (const unsigned char *)p;
+ do {
+ x = (x<<8) | *bytes++;
+ } while (--i > 0);
+ if (x <= LONG_MAX)
+ return PyInt_FromLong((long)x);
+ return PyLong_FromUnsignedLong(x);
+}
+
+static PyObject *
+bu_longlong(const char *p, const formatdef *f)
+{
+#ifdef HAVE_LONG_LONG
+ PY_LONG_LONG x = 0;
+ Py_ssize_t i = f->stdsize;
+ const unsigned char *bytes = (const unsigned char *)p;
+ do {
+ x = (x<<8) | *bytes++;
+ } while (--i > 0);
+ /* Extend the sign bit. */
+ if (SIZEOF_LONG_LONG > f->size)
+ x |= -(x & (1L << ((8 * f->size) - 1)));
+ if (x >= LONG_MIN && x <= LONG_MAX)
+ return PyInt_FromLong(Py_SAFE_DOWNCAST(x, PY_LONG_LONG, long));
+ return PyLong_FromLongLong(x);
+#else
+ return _PyLong_FromByteArray((const unsigned char *)p,
+ 8,
+ 0, /* little-endian */
+ 1 /* signed */);
+#endif
+}
+
+static PyObject *
+bu_ulonglong(const char *p, const formatdef *f)
+{
+#ifdef HAVE_LONG_LONG
+ unsigned PY_LONG_LONG x = 0;
+ Py_ssize_t i = f->stdsize;
+ const unsigned char *bytes = (const unsigned char *)p;
+ do {
+ x = (x<<8) | *bytes++;
+ } while (--i > 0);
+ if (x <= LONG_MAX)
+ return PyInt_FromLong(Py_SAFE_DOWNCAST(x, unsigned PY_LONG_LONG, long));
+ return PyLong_FromUnsignedLongLong(x);
+#else
+ return _PyLong_FromByteArray((const unsigned char *)p,
+ 8,
+ 0, /* little-endian */
+ 0 /* signed */);
+#endif
+}
+
+static PyObject *
+bu_float(const char *p, const formatdef *f)
+{
+ return unpack_float(p, 0);
+}
+
+static PyObject *
+bu_double(const char *p, const formatdef *f)
+{
+ return unpack_double(p, 0);
+}
+
+
+/***************
+
+HELPER ROUTINES for little-endian un-packing
+
+******************/
+
+
+static PyObject *
+lu_int(const char *p, const formatdef *f)
+{
+ long x = 0;
+ Py_ssize_t i = f->stdsize;
+ const unsigned char *bytes = (const unsigned char *)p;
+ do {
+ x = (x<<8) | bytes[--i];
+ } while (i > 0);
+ /* Extend the sign bit. */
+ if (SIZEOF_LONG > f->size)
+ x |= -(x & (1L << ((8 * f->size) - 1)));
+ return PyInt_FromLong(x);
+}
+
+static PyObject *
+lu_uint(const char *p, const formatdef *f)
+{
+ unsigned long x = 0;
+ Py_ssize_t i = f->stdsize;
+ const unsigned char *bytes = (const unsigned char *)p;
+ do {
+ x = (x<<8) | bytes[--i];
+ } while (i > 0);
+ if (x <= LONG_MAX)
+ return PyInt_FromLong((long)x);
+ return PyLong_FromUnsignedLong((long)x);
+}
+
+static PyObject *
+lu_longlong(const char *p, const formatdef *f)
+{
+#ifdef HAVE_LONG_LONG
+ PY_LONG_LONG x = 0;
+ Py_ssize_t i = f->stdsize;
+ const unsigned char *bytes = (const unsigned char *)p;
+ do {
+ x = (x<<8) | bytes[--i];
+ } while (i > 0);
+ /* Extend the sign bit. */
+ if (SIZEOF_LONG_LONG > f->size)
+ x |= -(x & (1L << ((8 * f->size) - 1)));
+ if (x >= LONG_MIN && x <= LONG_MAX)
+ return PyInt_FromLong(Py_SAFE_DOWNCAST(x, PY_LONG_LONG, long));
+ return PyLong_FromLongLong(x);
+#else
+ return _PyLong_FromByteArray((const unsigned char *)p,
+ 8,
+ 1, /* little-endian */
+ 1 /* signed */);
+#endif
+}
+
+static PyObject *
+lu_ulonglong(const char *p, const formatdef *f)
+{
+#ifdef HAVE_LONG_LONG
+ unsigned PY_LONG_LONG x = 0;
+ Py_ssize_t i = f->stdsize;
+ const unsigned char *bytes = (const unsigned char *)p;
+ do {
+ x = (x<<8) | bytes[--i];
+ } while (i > 0);
+ if (x <= LONG_MAX)
+ return PyInt_FromLong(Py_SAFE_DOWNCAST(x, unsigned PY_LONG_LONG, long));
+ return PyLong_FromUnsignedLongLong(x);
+#else
+ return _PyLong_FromByteArray((const unsigned char *)p,
+ 8,
+ 1, /* little-endian */
+ 0 /* signed */);
+#endif
+}
+
+static PyObject *
+lu_float(const char *p, const formatdef *f)
+{
+ return unpack_float(p, 1);
+}
+
+static PyObject *
+lu_double(const char *p, const formatdef *f)
+{
+ return unpack_double(p, 1);
+}
+
+
+/***************
+
+HELPER ROUTINES for big-endian packing
+
+******************/
+
+
+static int
+bp_int(char *p, PyObject *v, const formatdef *f)
+{
+ long x;
+ Py_ssize_t i;
+ if (get_wrapped_long(v, &x) < 0)
+ return -1;
+ i = f->stdsize;
+ if (i != SIZEOF_LONG) {
+ if ((i == 2) && (x < -32768 || x > 32767))
+ RANGE_ERROR(x, f, 0, 0xffffL);
+#if (SIZEOF_LONG != 4)
+ else if ((i == 4) && (x < -2147483648L || x > 2147483647L))
+ RANGE_ERROR(x, f, 0, 0xffffffffL);
+#endif
+#ifdef PY_STRUCT_OVERFLOW_MASKING
+ else if ((i == 1) && (x < -128 || x > 127))
+ RANGE_ERROR(x, f, 0, 0xffL);
+#endif
+ }
+ do {
+ p[--i] = (char)x;
+ x >>= 8;
+ } while (i > 0);
+ return 0;
+}
+
+static int
+bp_uint(char *p, PyObject *v, const formatdef *f)
+{
+ unsigned long x;
+ Py_ssize_t i;
+ if (get_wrapped_ulong(v, &x) < 0)
+ return -1;
+ i = f->stdsize;
+ if (i != SIZEOF_LONG) {
+ unsigned long maxint = 1;
+ maxint <<= (unsigned long)(i * 8);
+ if (x >= maxint)
+ RANGE_ERROR(x, f, 1, maxint - 1);
+ }
+ do {
+ p[--i] = (char)x;
+ x >>= 8;
+ } while (i > 0);
+ return 0;
+}
+
+static int
+bp_longlong(char *p, PyObject *v, const formatdef *f)
+{
+ int res;
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ res = _PyLong_AsByteArray((PyLongObject *)v,
+ (unsigned char *)p,
+ 8,
+ 0, /* little_endian */
+ 1 /* signed */);
+ Py_DECREF(v);
+ return res;
+}
+
+static int
+bp_ulonglong(char *p, PyObject *v, const formatdef *f)
+{
+ int res;
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ res = _PyLong_AsByteArray((PyLongObject *)v,
+ (unsigned char *)p,
+ 8,
+ 0, /* little_endian */
+ 0 /* signed */);
+ Py_DECREF(v);
+ return res;
+}
+
+static int
+bp_float(char *p, PyObject *v, const formatdef *f)
+{
+ double x = PyFloat_AsDouble(v);
+ if (x == -1 && PyErr_Occurred()) {
+ PyErr_SetString(StructError,
+ "required argument is not a float");
+ return -1;
+ }
+ return _PyFloat_Pack4(x, (unsigned char *)p, 0);
+}
+
+static int
+bp_double(char *p, PyObject *v, const formatdef *f)
+{
+ double x = PyFloat_AsDouble(v);
+ if (x == -1 && PyErr_Occurred()) {
+ PyErr_SetString(StructError,
+ "required argument is not a float");
+ return -1;
+ }
+ return _PyFloat_Pack8(x, (unsigned char *)p, 0);
+}
+
+
+/***************
+
+HELPER ROUTINES for little-endian un-packing
+
+******************/
+
+
+static int
+lp_int(char *p, PyObject *v, const formatdef *f)
+{
+ long x;
+ Py_ssize_t i;
+ if (get_wrapped_long(v, &x) < 0)
+ return -1;
+ i = f->stdsize;
+ if (i != SIZEOF_LONG) {
+ if ((i == 2) && (x < -32768 || x > 32767))
+ RANGE_ERROR(x, f, 0, 0xffffL);
+#if (SIZEOF_LONG != 4)
+ else if ((i == 4) && (x < -2147483648L || x > 2147483647L))
+ RANGE_ERROR(x, f, 0, 0xffffffffL);
+#endif
+#ifdef PY_STRUCT_OVERFLOW_MASKING
+ else if ((i == 1) && (x < -128 || x > 127))
+ RANGE_ERROR(x, f, 0, 0xffL);
+#endif
+ }
+ do {
+ *p++ = (char)x;
+ x >>= 8;
+ } while (--i > 0);
+ return 0;
+}
+
+static int
+lp_uint(char *p, PyObject *v, const formatdef *f)
+{
+ unsigned long x;
+ Py_ssize_t i;
+ if (get_wrapped_ulong(v, &x) < 0)
+ return -1;
+ i = f->stdsize;
+ if (i != SIZEOF_LONG) {
+ unsigned long maxint = 1;
+ maxint <<= (unsigned long)(i * 8);
+ if (x >= maxint)
+ RANGE_ERROR(x, f, 1, maxint - 1);
+ }
+ do {
+ *p++ = (char)x;
+ x >>= 8;
+ } while (--i > 0);
+ return 0;
+}
+
+static int
+lp_longlong(char *p, PyObject *v, const formatdef *f)
+{
+ int res;
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ res = _PyLong_AsByteArray((PyLongObject*)v,
+ (unsigned char *)p,
+ 8,
+ 1, /* little_endian */
+ 1 /* signed */);
+ Py_DECREF(v);
+ return res;
+}
+
+static int
+lp_ulonglong(char *p, PyObject *v, const formatdef *f)
+{
+ int res;
+ v = get_pylong(v);
+ if (v == NULL)
+ return -1;
+ res = _PyLong_AsByteArray((PyLongObject*)v,
+ (unsigned char *)p,
+ 8,
+ 1, /* little_endian */
+ 0 /* signed */);
+ Py_DECREF(v);
+ return res;
+}
+
+static int
+lp_float(char *p, PyObject *v, const formatdef *f)
+{
+ double x = PyFloat_AsDouble(v);
+ if (x == -1 && PyErr_Occurred()) {
+ PyErr_SetString(StructError,
+ "required argument is not a float");
+ return -1;
+ }
+ return _PyFloat_Pack4(x, (unsigned char *)p, 1);
+}
+
+static int
+lp_double(char *p, PyObject *v, const formatdef *f)
+{
+ double x = PyFloat_AsDouble(v);
+ if (x == -1 && PyErr_Occurred()) {
+ PyErr_SetString(StructError,
+ "required argument is not a float");
+ return -1;
+ }
+ return _PyFloat_Pack8(x, (unsigned char *)p, 1);
+}
+
+
+
+static PyObject *
+u_short(const char *p, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+ short x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyInt_FromLong((long)x);
+ }
+ else if F_IS_LE(c) {
+ return lu_int(p, f);
+ }
+ else {
+ return bu_int(p, f);
+ }
+}
+
+
+static int
+p_short(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+
+ if F_IS_NATIVE(c) {
+ long x;
+ short y;
+ if (get_long(v, &x) < 0)
+ return -1;
+ if (x < SHRT_MIN || x > SHRT_MAX){
+ PyErr_SetString(StructError,
+ "short format requires " STRINGIFY(SHRT_MIN)
+ " <= number <= " STRINGIFY(SHRT_MAX));
+ return -1;
+ }
+ y = (short)x;
+ memcpy(p, (char *)&y, sizeof y);
+ return 0;
+ }
+ else if F_IS_LE(c) {
+ return lp_int(p, v, f);
+ }
+ else {
+ return bp_int(p, v, f);
+ }
+}
+
+
+static PyObject *
+u_ushort(const char *p, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+ unsigned short x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyInt_FromLong((long)x);
+ }
+ else if F_IS_LE(c) {
+ return lu_uint(p, f);
+ }
+ else {
+ return bu_uint(p, f);
+ }
+}
+
+
+static int
+p_ushort(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+
+ if F_IS_NATIVE(c) {
+ long x;
+ unsigned short y;
+ if (get_long(v, &x) < 0)
+ return -1;
+ if (x < 0 || x > USHRT_MAX){
+ PyErr_SetString(StructError,
+ "short format requires "
+ "0 <= number <= " STRINGIFY(USHRT_MAX));
+ return -1;
+ }
+ y = (unsigned short)x;
+ memcpy(p, (char *)&y, sizeof y);
+ return 0;
+ }
+ else if F_IS_LE(c) {
+ return lp_uint(p, v, f);
+ }
+ else {
+ return bp_uint(p, v, f);
+ }
+}
+
+static PyObject *
+u_int(const char *p, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+ int x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyInt_FromLong((long)x);
+ }
+ else if F_IS_LE(c) {
+ return lu_int(p, f);
+ }
+ else {
+ return bu_int(p, f);
+ }
+}
+
+
+static int
+p_int(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+ long x;
+ int y;
+ if (get_long(v, &x) < 0)
+ return -1;
+ if (x < SHRT_MIN || x > SHRT_MAX){
+ PyErr_SetString(StructError,
+ "int format requires " STRINGIFY(SHRT_MIN)
+ " <= number <= " STRINGIFY(SHRT_MAX));
+ return -1;
+ }
+ y = (int)x;
+ memcpy(p, (char *)&y, sizeof y);
+ return 0;
+ }
+ else if F_IS_LE(c) {
+ return lp_int(p, v, f);
+ }
+ else {
+ return bp_int(p, v, f);
+ }
+}
+
+
+static PyObject *
+u_uint(const char *p, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+ unsigned int x;
+ memcpy((char *)&x, p, sizeof x);
+#if (SIZEOF_LONG > SIZEOF_INT)
+ return PyInt_FromLong((long)x);
+#else
+ if (x <= ((unsigned int)LONG_MAX))
+ return PyInt_FromLong((long)x);
+ return PyLong_FromUnsignedLong((unsigned long)x);
+#endif
+ }
+ else if F_IS_LE(c) {
+ return lu_uint(p, f);
+ }
+ else {
+ return bu_uint(p, f);
+ }
+}
+
+
+static int
+p_uint(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+
+ if F_IS_NATIVE(c) {
+ unsigned long x;
+ unsigned int y;
+ if (get_ulong(v, &x) < 0)
+ return _range_error(f, 1);
+ y = (unsigned int)x;
+#if (SIZEOF_LONG > SIZEOF_INT)
+ if (x > ((unsigned long)UINT_MAX))
+ return _range_error(f, 1);
+#endif
+ memcpy(p, (char *)&y, sizeof y);
+ return 0;
+ }
+ else if F_IS_LE(c) {
+ return lp_uint(p, v, f);
+ }
+ else {
+ return bp_uint(p, v, f);
+ }
+}
+
+
+static PyObject *
+u_long(const char *p, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+ long x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyInt_FromLong(x);
+ }
+ else if F_IS_LE(c) {
+ return lu_int(p, f);
+ }
+ else {
+ return bu_int(p, f);
+ }
+}
+
+
+static int
+p_long(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+ long x;
+ if (get_long(v, &x) < 0)
+ return -1;
+ memcpy(p, (char *)&x, sizeof x);
+ return 0;
+ }
+ else if F_IS_LE(c) {
+ return lp_int(p, v, f);
+ }
+ else {
+ return bp_int(p, v, f);
+ }
+}
+
+
+static PyObject *
+u_ulong(const char *p, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+ unsigned long x;
+ memcpy((char *)&x, p, sizeof x);
+ if (x <= LONG_MAX)
+ return PyInt_FromLong((long) x);
+ return PyLong_FromUnsignedLong(x);
+ }
+ else if F_IS_LE(c) {
+ return lu_uint(p, f);
+ }
+ else {
+ return bu_uint(p, f);
+ }
+}
+
+
+static int
+p_ulong(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+
+ if F_IS_NATIVE(c) {
+ unsigned long x;
+ if (get_long(v, &x) < 0)
+ return _range_error(f, 1);
+ memcpy(p, (char *)&x, sizeof x);
+ return 0;
+ }
+ else if F_IS_LE(c) {
+ return lp_uint(p, v, f);
+ }
+ else {
+ return bp_uint(p, v, f);
+ }
+}
+
+#ifndef HAVE_LONG_LONG
+static void
+_no_longlong(void)
+{
+ PyErr_Format(StructError, "native long-long not supported.");
+}
+#endif
+
+
+
+static PyObject *
+u_longlong(const char *p, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+#ifdef HAVE_LONG_LONG
+ PY_LONG_LONG x;
+ memcpy((char *)&x, p, sizeof x);
+ if (x >= LONG_MIN && x <= LONG_MAX)
+ return PyInt_FromLong(Py_SAFE_DOWNCAST(x, PY_LONG_LONG, long));
+ return PyLong_FromLongLong(x);
+#else
+ _no_longlong();
+ return NULL;
+#endif
+ }
+ else if F_IS_LE(c) {
+ return lu_int(p, f);
+ }
+ else {
+ return bu_int(p, f);
+ }
+}
+
+
+static int
+p_longlong(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+#ifdef HAVE_LONG_LONG
+ PY_LONG_LONG x;
+ if (get_longlong(v, &x) < 0)
+ return -1;
+ memcpy(p, (char *)&x, sizeof x);
+ return 0;
+#else
+ _no_longlong();
+ return -1;
+#endif
+ }
+ else if F_IS_LE(c) {
+ return lp_longlong(p, v, f);
+ }
+ else {
+ return bp_longlong(p, v, f);
+ }
+}
+
+
+static PyObject *
+u_ulonglong(const char *p, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+#ifdef HAVE_LONG_LONG
+ unsigned PY_LONG_LONG x;
+ memcpy((char *)&x, p, sizeof x);
+ if (x <= LONG_MAX)
+ return PyInt_FromLong(Py_SAFE_DOWNCAST(x, unsigned PY_LONG_LONG, long));
+ return PyLong_FromUnsignedLongLong(x);
+#else
+ _no_longlong();
+ return NULL;
+#endif
+ }
+ else if F_IS_LE(c) {
+ return lu_ulonglong(p, f);
+ }
+ else {
+ return bu_ulonglong(p, f);
+ }
+}
+
+
+static int
+p_ulonglong(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+
+ if F_IS_NATIVE(c) {
+#ifdef HAVE_LONG_LONG
+ unsigned PY_LONG_LONG x;
+ if (get_ulonglong(v, &x) < 0)
+ return -1;
+ memcpy(p, (char *)&x, sizeof x);
+ return 0;
+#else
+ _no_longlong();
+ return -1;
+#endif
+ }
+ else if F_IS_LE(c) {
+ return lp_ulonglong(p, v, f);
+ }
+ else {
+ return bp_ulonglong(p, v, f);
+ }
+}
+
+
+static PyObject *
+u_bool(const char *p, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+ BOOL_TYPE x;
+ memcpy((char *)&x, p, sizeof x);
+ }
+ else {
+ char x;
+ memcpy((char *)&x, p, sizeof x);
+ }
+ return PyBool_FromLong(x != 0);
+
+}
+
+
+static int
+p_bool(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+ BOOL_TYPE y;
+ y = PyObject_IsTrue(v);
+ memcpy(p, (char *)&y, sizeof y);
+ }
+ else {
+ char y;
+ y = PyObject_IsTrue(v);
+ memcpy(p, (char *)&y, sizeof y);
+ }
+ return 0;
+
+}
+
+
+static PyObject *
+u_float(const char *p, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+ float x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyFloat_FromDouble((double)x);
+ }
+ else {
+ return unpack_float(p, F_IS_LE(c));
+ }
+}
+
+
+static int
+p_float(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+ double xi;
+
+ xi = PyFloat_AsDouble(v);
+ if (xi == -1 && PyErr_Occurred()) {
+ PyErr_SetString(StructError,
+ "required argument is not a float");
+ return -1;
+ }
+ if F_IS_NATIVE(c) {
+ float x = (float) xi;
+ memcpy(p, (char *)&x, sizeof x);
+ return 0;
+ }
+ else {
+ return _PyFloat_Pack4(x, (unsigned char *)p, F_IS_LE(c));
+ }
+}
+
+
+static PyObject *
+u_double(const char *p, const formatdef *f, const formatcode *c)
+{
+ if F_IS_NATIVE(c) {
+ double x;
+ memcpy((char *)&x, p, sizeof x);
+ return PyFloat_FromDouble((double)x);
+ }
+ else {
+ return unpack_double(p, F_IS_LE(c));
+ }
+}
+
+static int
+p_double(char *p, PyObject *v, const formatdef *f, const formatcode *c)
+{
+ double x;
+
+ x = PyFloat_AsDouble(v);
+ if (x == -1 && PyErr_Occurred()) {
+ PyErr_SetString(StructError,
+ "required argument is not a float");
+ return -1;
+ }
+ if F_IS_NATIVE(c) {
+ memcpy(p, (char *)&x, sizeof x);
+ return 0;
+ }
+ else {
+ return _PyFloat_Pack8(x, (unsigned char *)p, F_IS_LE(c));
+ }
+}
+
+
+/* There is only one un-packing and packing table,
+ to allow switching of the endian-ness within a struct
+ native, little-endian, and big-endian packing
+ are handled by these functions based on the
+ format-code flag. Whether or not to use alignment is
+ also handled by the flag. Alignment is
+ used only in native mode (no flag set).
+*/
+static formatdef general_table[] = {
+ {'x', sizeof(char), 1, 0, NULL, NULL},
+ {'t', 0, 0, 0, u_bit, p_bit},
+ {'b', sizeof(char), 1, 0, u_byte, p_byte},
+ {'B', sizeof(char), 1, 0, u_ubyte, p_ubyte},
+ {'c', sizeof(char), 1, 0, u_char, p_char},
+ {'u', 2, 2, 0, u_ucs2, p_ucs2},
+ {'w', 4, 4, 0, u_ucs4, p_ucs4},
+ {'s', sizeof(char), 1, 0, NULL, NULL},
+ {'p', sizeof(char), 1, 0, NULL, NULL},
+ {'h', sizeof(short), 2, SHORT_ALIGN, u_short, p_short},
+ {'H', sizeof(short), 2, SHORT_ALIGN, u_ushort, p_ushort},
+ {'i', sizeof(int), 4, INT_ALIGN, u_int, p_int},
+ {'I', sizeof(int), 4, INT_ALIGN, u_uint, p_uint},
+ {'l', sizeof(long), 4, LONG_ALIGN, u_long, p_long},
+ {'L', sizeof(long), 4, LONG_ALIGN, u_ulong, p_ulong},
+ {'q', 0, 8, 0, u_longlong, p_longlong},
+ {'Q', 0, 8, 0, u_ulonglong, p_ulonglong},
+ {'?', sizeof(BOOL_TYPE), 1, BOOL_ALIGN, u_bool, p_bool},
+ {'f', sizeof(float), 4, FLOAT_ALIGN, u_float, p_float},
+ {'d', sizeof(double), 8, DOUBLE_ALIGN, u_double, p_double},
+ {'g', 0, 16, 0, u_longdouble, p_longdouble},
+ {'Z', 0, 0, 0, u_cmplx, p_cmplx},
+ {'&', sizeof(void*), -1, VOID_P_ALIGN, u_gptr, p_gptr},
+ {'(', 0, -1, 0, u_array, p_array},
+ {'P', sizeof(void*), -1, VOID_P_ALIGN, u_void_p, p_void_p},
+ {'O', sizeof(PyObject*), -1, VOID_P_ALIGN, u_object_p, p_object_p},
+ {'T', 0, -1, 0, u_struct, p_struct},
+ {'X', sizeof(void*), -1, VOID_P_ALIGN, u_funcptr, p_funcptr},
+ {0}
+};
+
+
+/* Get the table entry for a format code */
+
+static const formatdef *
+getentry(int c, const formatdef *f)
+{
+ for (; f->format != '\0'; f++) {
+ if (f->format == c) {
+ return f;
+ }
+ }
+ PyErr_SetString(StructError, "bad char in struct format");
+ return NULL;
+}
+
+
+/* Align a size according to a format code */
+
+static int
+align(Py_ssize_t size, char c, const formatdef *e)
+{
+ if (e->format == c) {
+ if (e->alignment) {
+ size = ((size + e->alignment - 1)
+ / e->alignment)
+ * e->alignment;
+ }
+ }
+ return size;
+}
+
+
+/* calculate the size of a format string */
+
+static int
+prepare_s(PyStructObject *self)
+{
+ const formatdef *f;
+ const formatdef *e;
+ formatcode *codes;
+
+ const char *s;
+ const char *fmt;
+ char c;
+ Py_ssize_t size, len, num, itemsize, x;
+
+ fmt = PyString_AS_STRING(self->s_format);
+
+ f = whichtable((char **)&fmt);
+
+ s = fmt;
+ size = 0;
+ len = 0;
+ while ((c = *s++) != '\0') {
+ if (isspace(Py_CHARMASK(c)))
+ continue;
+ if ('0' <= c && c <= '9') {
+ num = c - '0';
+ while ('0' <= (c = *s++) && c <= '9') {
+ x = num*10 + (c - '0');
+ if (x/10 != num) {
+ PyErr_SetString(
+ StructError,
+ "overflow in item count");
+ return -1;
+ }
+ num = x;
+ }
+ if (c == '\0')
+ break;
+ }
+ else
+ num = 1;
+
+ e = getentry(c, f);
+ if (e == NULL)
+ return -1;
+
+ switch (c) {
+ case 's': /* fall through */
+ case 'p': len++; break;
+ case 'x': break;
+ default: len += num; break;
+ }
+
+ itemsize = e->size;
+ size = align(size, c, e);
+ x = num * itemsize;
+ size += x;
+ if (x/itemsize != num || size < 0) {
+ PyErr_SetString(StructError,
+ "total struct size too long");
+ return -1;
+ }
+ }
+
+ self->s_size = size;
+ self->s_len = len;
+ codes = PyMem_MALLOC((len + 1) * sizeof(formatcode));
+ if (codes == NULL) {
+ PyErr_NoMemory();
+ return -1;
+ }
+ self->s_codes = codes;
+
+ s = fmt;
+ size = 0;
+ while ((c = *s++) != '\0') {
+ if (isspace(Py_CHARMASK(c)))
+ continue;
+ if ('0' <= c && c <= '9') {
+ num = c - '0';
+ while ('0' <= (c = *s++) && c <= '9')
+ num = num*10 + (c - '0');
+ if (c == '\0')
+ break;
+ }
+ else
+ num = 1;
+
+ e = getentry(c, f);
+
+ size = align(size, c, e);
+ if (c == 's' || c == 'p') {
+ codes->offset = size;
+ codes->size = num;
+ codes->fmtdef = e;
+ codes++;
+ size += num;
+ } else if (c == 'x') {
+ size += num;
+ } else {
+ while (--num >= 0) {
+ codes->offset = size;
+ codes->size = e->size;
+ codes->fmtdef = e;
+ codes++;
+ size += e->size;
+ }
+ }
+ }
+ codes->fmtdef = NULL;
+ codes->offset = size;
+ codes->size = 0;
+
+ return 0;
+}
+
+static PyObject *
+s_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+ PyObject *self;
+
+ assert(type != NULL && type->tp_alloc != NULL);
+
+ self = type->tp_alloc(type, 0);
+ if (self != NULL) {
+ PyStructObject *s = (PyStructObject*)self;
+ Py_INCREF(Py_None);
+ s->s_format = Py_None;
+ s->s_codes = NULL;
+ s->s_size = -1;
+ s->s_len = -1;
+ }
+ return self;
+}
+
+static int
+s_init(PyObject *self, PyObject *args, PyObject *kwds)
+{
+ PyStructObject *soself = (PyStructObject *)self;
+ PyObject *o_format = NULL;
+ int ret = 0;
+ static char *kwlist[] = {"format", 0};
+
+ assert(PyStruct_Check(self));
+
+ if (!PyArg_ParseTupleAndKeywords(args, kwds, "S:Struct", kwlist,
+ &o_format))
+ return -1;
+
+ Py_INCREF(o_format);
+ Py_XDECREF(soself->s_format);
+ soself->s_format = o_format;
+
+ ret = prepare_s(soself);
+ return ret;
+}
+
+static void
+s_dealloc(PyStructObject *s)
+{
+ if (s->weakreflist != NULL)
+ PyObject_ClearWeakRefs((PyObject *)s);
+ if (s->s_codes != NULL) {
+ PyMem_FREE(s->s_codes);
+ }
+ Py_XDECREF(s->s_format);
+ s->ob_type->tp_free((PyObject *)s);
+}
+
+static PyObject *
+s_unpack_internal(PyStructObject *soself, char *startfrom) {
+ formatcode *code;
+ Py_ssize_t i = 0;
+ PyObject *result = PyTuple_New(soself->s_len);
+ if (result == NULL)
+ return NULL;
+
+ for (code = soself->s_codes; code->fmtdef != NULL; code++) {
+ PyObject *v;
+ const formatdef *e = code->fmtdef;
+ const char *res = startfrom + code->offset;
+ if (e->format == 's') {
+ v = PyString_FromStringAndSize(res, code->size);
+ } else if (e->format == 'p') {
+ Py_ssize_t n = *(unsigned char*)res;
+ if (n >= code->size)
+ n = code->size - 1;
+ v = PyString_FromStringAndSize(res + 1, n);
+ } else {
+ v = e->unpack(res, e);
+ }
+ if (v == NULL)
+ goto fail;
+ PyTuple_SET_ITEM(result, i++, v);
+ }
+
+ return result;
+fail:
+ Py_DECREF(result);
+ return NULL;
+}
+
+
+PyDoc_STRVAR(s_unpack__doc__,
+"S.unpack(str) -> (v1, v2, ...)\n\
+\n\
+Return tuple containing values unpacked according to this Struct's format.\n\
+Requires len(str) == self.size. See struct.__doc__ for more on format\n\
+strings.");
+
+static PyObject *
+s_unpack(PyObject *self, PyObject *inputstr)
+{
+ PyStructObject *soself = (PyStructObject *)self;
+ assert(PyStruct_Check(self));
+ assert(soself->s_codes != NULL);
+ if (inputstr == NULL || !PyString_Check(inputstr) ||
+ PyString_GET_SIZE(inputstr) != soself->s_size) {
+ PyErr_Format(StructError,
+ "unpack requires a string argument of length %zd",
+ soself->s_size);
+ return NULL;
+ }
+ return s_unpack_internal(soself, PyString_AS_STRING(inputstr));
+}
+
+PyDoc_STRVAR(s_unpack_from__doc__,
+"S.unpack_from(buffer[, offset]) -> (v1, v2, ...)\n\
+\n\
+Return tuple containing values unpacked according to this Struct's format.\n\
+Unlike unpack, unpack_from can unpack values from any object supporting\n\
+the buffer API, not just str. Requires len(buffer[offset:]) >= self.size.\n\
+See struct.__doc__ for more on format strings.");
+
+static PyObject *
+s_unpack_from(PyObject *self, PyObject *args, PyObject *kwds)
+{
+ static char *kwlist[] = {"buffer", "offset", 0};
+#if (PY_VERSION_HEX < 0x02050000)
+ static char *fmt = "z#|i:unpack_from";
+#else
+ static char *fmt = "z#|n:unpack_from";
+#endif
+ Py_ssize_t buffer_len = 0, offset = 0;
+ char *buffer = NULL;
+ PyStructObject *soself = (PyStructObject *)self;
+ assert(PyStruct_Check(self));
+ assert(soself->s_codes != NULL);
+
+ if (!PyArg_ParseTupleAndKeywords(args, kwds, fmt, kwlist,
+ &buffer, &buffer_len, &offset))
+ return NULL;
+
+ if (buffer == NULL) {
+ PyErr_Format(StructError,
+ "unpack_from requires a buffer argument");
+ return NULL;
+ }
+
+ if (offset < 0)
+ offset += buffer_len;
+
+ if (offset < 0 || (buffer_len - offset) < soself->s_size) {
+ PyErr_Format(StructError,
+ "unpack_from requires a buffer of at least %zd bytes",
+ soself->s_size);
+ return NULL;
+ }
+ return s_unpack_internal(soself, buffer + offset);
+}
+
+
+/*
+ * Guts of the pack function.
+ *
+ * Takes a struct object, a tuple of arguments, and offset in that tuple of
+ * argument for where to start processing the arguments for packing, and a
+ * character buffer for writing the packed string. The caller must insure
+ * that the buffer may contain the required length for packing the arguments.
+ * 0 is returned on success, 1 is returned if there is an error.
+ *
+ */
+static int
+s_pack_internal(PyStructObject *soself, PyObject *args, int offset, char* buf)
+{
+ formatcode *code;
+ /* XXX(nnorwitz): why does i need to be a local? can we use
+ the offset parameter or do we need the wider width? */
+ Py_ssize_t i;
+
+ memset(buf, '\0', soself->s_size);
+ i = offset;
+ for (code = soself->s_codes; code->fmtdef != NULL; code++) {
+ Py_ssize_t n;
+ PyObject *v = PyTuple_GET_ITEM(args, i++);
+ const formatdef *e = code->fmtdef;
+ char *res = buf + code->offset;
+ if (e->format == 's') {
+ if (!PyString_Check(v)) {
+ PyErr_SetString(StructError,
+ "argument for 's' must be a string");
+ return -1;
+ }
+ n = PyString_GET_SIZE(v);
+ if (n > code->size)
+ n = code->size;
+ if (n > 0)
+ memcpy(res, PyString_AS_STRING(v), n);
+ } else if (e->format == 'p') {
+ if (!PyString_Check(v)) {
+ PyErr_SetString(StructError,
+ "argument for 'p' must be a string");
+ return -1;
+ }
+ n = PyString_GET_SIZE(v);
+ if (n > (code->size - 1))
+ n = code->size - 1;
+ if (n > 0)
+ memcpy(res + 1, PyString_AS_STRING(v), n);
+ if (n > 255)
+ n = 255;
+ *res = Py_SAFE_DOWNCAST(n, Py_ssize_t, unsigned char);
+ } else {
+ if (e->pack(res, v, e) < 0) {
+ if (PyLong_Check(v) && PyErr_ExceptionMatches(PyExc_OverflowError))
+ PyErr_SetString(StructError,
+ "long too large to convert to int");
+ return -1;
+ }
+ }
+ }
+
+ /* Success */
+ return 0;
+}
+
+
+PyDoc_STRVAR(s_pack__doc__,
+"S.pack(v1, v2, ...) -> string\n\
+\n\
+Return a string containing values v1, v2, ... packed according to this\n\
+Struct's format. See struct.__doc__ for more on format strings.");
+
+static PyObject *
+s_pack(PyObject *self, PyObject *args)
+{
+ PyStructObject *soself;
+ PyObject *result;
+
+ /* Validate arguments. */
+ soself = (PyStructObject *)self;
+ assert(PyStruct_Check(self));
+ assert(soself->s_codes != NULL);
+ if (PyTuple_GET_SIZE(args) != soself->s_len)
+ {
+ PyErr_Format(StructError,
+ "pack requires exactly %zd arguments", soself->s_len);
+ return NULL;
+ }
+
+ /* Allocate a new string */
+ result = PyString_FromStringAndSize((char *)NULL, soself->s_size);
+ if (result == NULL)
+ return NULL;
+
+ /* Call the guts */
+ if ( s_pack_internal(soself, args, 0, PyString_AS_STRING(result)) != 0 ) {
+ Py_DECREF(result);
+ return NULL;
+ }
+
+ return result;
+}
+
+PyDoc_STRVAR(s_pack_into__doc__,
+"S.pack_into(buffer, offset, v1, v2, ...)\n\
+\n\
+Pack the values v1, v2, ... according to this Struct's format, write \n\
+the packed bytes into the writable buffer buf starting at offset. Note\n\
+that the offset is not an optional argument. See struct.__doc__ for \n\
+more on format strings.");
+
+static PyObject *
+s_pack_into(PyObject *self, PyObject *args)
+{
+ PyStructObject *soself;
+ char *buffer;
+ Py_ssize_t buffer_len, offset;
+
+ /* Validate arguments. +1 is for the first arg as buffer. */
+ soself = (PyStructObject *)self;
+ assert(PyStruct_Check(self));
+ assert(soself->s_codes != NULL);
+ if (PyTuple_GET_SIZE(args) != (soself->s_len + 2))
+ {
+ PyErr_Format(StructError,
+ "pack_into requires exactly %zd arguments",
+ (soself->s_len + 2));
+ return NULL;
+ }
+
+ /* Extract a writable memory buffer from the first argument */
+ if ( PyObject_AsWriteBuffer(PyTuple_GET_ITEM(args, 0),
+ (void**)&buffer, &buffer_len) == -1 ) {
+ return NULL;
+ }
+ assert( buffer_len >= 0 );
+
+ /* Extract the offset from the first argument */
+ offset = PyInt_AsSsize_t(PyTuple_GET_ITEM(args, 1));
+
+ /* Support negative offsets. */
+ if (offset < 0)
+ offset += buffer_len;
+
+ /* Check boundaries */
+ if (offset < 0 || (buffer_len - offset) < soself->s_size) {
+ PyErr_Format(StructError,
+ "pack_into requires a buffer of at least %zd bytes",
+ soself->s_size);
+ return NULL;
+ }
+
+ /* Call the guts */
+ if ( s_pack_internal(soself, args, 2, buffer + offset) != 0 ) {
+ return NULL;
+ }
+
+ Py_RETURN_NONE;
+}
+
+static PyObject *
+s_get_format(PyStructObject *self, void *unused)
+{
+ Py_INCREF(self->s_format);
+ return self->s_format;
+}
+
+static PyObject *
+s_get_size(PyStructObject *self, void *unused)
+{
+ return PyInt_FromSsize_t(self->s_size);
+}
+
+static PyObject *
+s_get_numcodes(PyStructObject *self, void *unused)
+{
+ return PyInt_FromSsize_t(self->s_len);
+}
+
+/* List of functions */
+
+static struct PyMethodDef s_methods[] = {
+ {"pack", s_pack, METH_VARARGS, s_pack__doc__},
+ {"pack_into", s_pack_into, METH_VARARGS, s_pack_into__doc__},
+ {"unpack", s_unpack, METH_O, s_unpack__doc__},
+ {"unpack_from", (PyCFunction)s_unpack_from, METH_KEYWORDS,
+ s_unpack_from__doc__},
+ {NULL, NULL} /* sentinel */
+};
+
+PyDoc_STRVAR(s__doc__, "Compiled struct object");
+
+#define OFF(x) offsetof(PyStructObject, x)
+
+static PyGetSetDef s_getsetlist[] = {
+ {"format", (getter)s_get_format, (setter)NULL, "struct format string", NULL},
+ {"size", (getter)s_get_size, (setter)NULL, "struct size in bytes", NULL},
+ {"numcodes", (getter)s_get_len, (setter)NULL, "number of elements in struct", NULL},
+ {NULL} /* sentinel */
+};
+
+static
+PyTypeObject PyStructType = {
+ PyObject_HEAD_INIT(NULL)
+ 0,
+ "Struct",
+ sizeof(PyStructObject),
+ 0,
+ (destructor)s_dealloc, /* tp_dealloc */
+ 0, /* tp_print */
+ 0, /* tp_getattr */
+ 0, /* tp_setattr */
+ 0, /* tp_compare */
+ 0, /* tp_repr */
+ 0, /* tp_as_number */
+ 0, /* tp_as_sequence */
+ 0, /* tp_as_mapping */
+ 0, /* tp_hash */
+ 0, /* tp_call */
+ 0, /* tp_str */
+ PyObject_GenericGetAttr, /* tp_getattro */
+ PyObject_GenericSetAttr, /* tp_setattro */
+ 0, /* tp_as_buffer */
+ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
+ s__doc__, /* tp_doc */
+ 0, /* tp_traverse */
+ 0, /* tp_clear */
+ 0, /* tp_richcompare */
+ offsetof(PyStructObject, weakreflist), /* tp_weaklistoffset */
+ 0, /* tp_iter */
+ 0, /* tp_iternext */
+ s_methods, /* tp_methods */
+ NULL, /* tp_members */
+ s_getsetlist, /* tp_getset */
+ 0, /* tp_base */
+ 0, /* tp_dict */
+ 0, /* tp_descr_get */
+ 0, /* tp_descr_set */
+ 0, /* tp_dictoffset */
+ s_init, /* tp_init */
+ PType_GenericAlloc, /* tp_alloc */
+ s_new, /* tp_new */
+ PyObject_Del, /* tp_free */
+};
+
+
+static
+PyTypeObject PyFieldTupleType = {
+ PyObject_HEAD_INIT(NULL)
+ 0,
+ "fieldtuple",
+ sizeof(PyFieldTupleObject),
+ 0,
+ (destructor)f_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 */
+ &f_as_mapping, /* tp_as_mapping */
+ 0, /* tp_hash */
+ 0, /* tp_call */
+ 0, /* tp_str */
+ PyObject_GenericGetAttr, /* tp_getattro */
+ PyObject_GenericSetAttr, /* tp_setattro */
+ 0, /* tp_as_buffer */
+ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
+ f__doc__, /* tp_doc */
+ 0, /* tp_traverse */
+ 0, /* tp_clear */
+ 0, /* tp_richcompare */
+ 0, /* tp_weaklistoffset */
+ 0, /* tp_iter */
+ 0, /* tp_iternext */
+ 0, /* tp_methods */
+ NULL, /* tp_members */
+ 0, /* tp_getset */
+ &PyTuple_Type, /* tp_base */
+ 0, /* tp_dict */
+ 0, /* tp_descr_get */
+ 0, /* tp_descr_set */
+ 0, /* tp_dictoffset */
+ f_init, /* tp_init */
+ PyType_GenericAlloc, /* tp_alloc */
+ f_new, /* tp_new */
+ PyObject_Del, /* tp_free */
+};
+
+/* Module initialization */
+
+PyMODINIT_FUNC
+init_struct(void)
+{
+ PyObject *m = Py_InitModule("_struct", NULL);
+ if (m == NULL)
+ return;
+
+ /* fill in LONG_LONG and LONG_DOUBLE table-entries if needed */
+ {
+ const formatdef *entry;
+ const formatdef *table;
+
+ table = (const formatdef *)general_table;
+#ifdef HAVE_LONG_LONG
+
+ entry = getentry('q',table);
+ entry->size = sizeof(PY_LONG_LONG);
+ entry->alignment = LONG_LONG_ALIGN;
+
+ entry = getentry('Q',table);
+ entry->size = sizeof(PY_LONG_LONG);
+ entry->alignment = LONG_LONG_ALIGN;
+#endif
+
+#ifdef HAVE_LONG_DOUBLE
+ entry = getentry('g',table);
+ entry->size = sizeof(long double);
+ entry->alignment = LONG_DOUBLE_ALIGN;
+#endif
+ }
+
+ PyStructType.ob_type = &PyType_Type;
+ if (PyType_Ready(&PyStructType) < 0)
+ return;
+
+ PyFieldTupleType.ob_type = &PyType_Type;
+ if (PyType_Read(&PyFieldTupleType) < 0)
+ return;
+
+#ifdef PY_STRUCT_OVERFLOW_MASKING
+ if (pyint_zero == NULL) {
+ pyint_zero = PyInt_FromLong(0);
+ if (pyint_zero == NULL)
+ return;
+ }
+ if (pylong_ulong_mask == NULL) {
+ #if (SIZEOF_LONG == 4)
+ pylong_ulong_mask = PyLong_FromString("FFFFFFFF", NULL, 16);
+ #else
+ pylong_ulong_mask = PyLong_FromString("FFFFFFFFFFFFFFFF", NULL, 16);
+ #endif
+ if (pylong_ulong_mask == NULL)
+ return;
+ }
+#endif
+
+
+ /* Add some symbolic constants to the module */
+ if (StructError == NULL) {
+ StructError = PyErr_NewException("struct.error", NULL, NULL);
+ if (StructError == NULL)
+ return;
+ }
+
+ Py_INCREF(StructError);
+ PyModule_AddObject(m, "error", StructError);
+
+ Py_INCREF((PyObject*)&PyStructType);
+ PyModule_AddObject(m, "Struct", (PyObject*)&PyStructType);
+
+ PyModule_AddIntConstant(m, "_PY_STRUCT_RANGE_CHECKING", 1);
+#ifdef PY_STRUCT_OVERFLOW_MASKING
+ PyModule_AddIntConstant(m, "_PY_STRUCT_OVERFLOW_MASKING", 1);
+#endif
+#ifdef PY_STRUCT_FLOAT_COERCE
+ PyModule_AddIntConstant(m, "_PY_STRUCT_FLOAT_COERCE", 1);
+#endif
+
+}
+
+
+
Property changes on: branches/py3k/Modules/_struct.c
___________________________________________________________________
Name: svn:keywords
+ Id
Name: svn:eol-style
+ native
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