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svn+ssh://pythondev@svn.python.org/python/trunk ........ r75283 | mark.dickinson | 2009-10-08 16:54:10 +0100 (Thu, 08 Oct 2009) | 4 lines Issue #7078: _struct.__doc__ was being ignored. Import it into struct. Also add description of '?' struct format character. Thanks Gabriel Genellina for the patch. ........
2015 lines
45 KiB
C
2015 lines
45 KiB
C
/* struct module -- pack values into and (out of) bytes objects */
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/* New version supporting byte order, alignment and size options,
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character strings, and unsigned numbers */
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#define PY_SSIZE_T_CLEAN
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#include "Python.h"
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#include "structseq.h"
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#include "structmember.h"
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#include <ctype.h>
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static PyTypeObject PyStructType;
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/* The translation function for each format character is table driven */
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typedef struct _formatdef {
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char format;
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Py_ssize_t size;
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Py_ssize_t alignment;
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PyObject* (*unpack)(const char *,
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const struct _formatdef *);
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int (*pack)(char *, PyObject *,
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const struct _formatdef *);
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} formatdef;
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typedef struct _formatcode {
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const struct _formatdef *fmtdef;
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Py_ssize_t offset;
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Py_ssize_t size;
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} formatcode;
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/* Struct object interface */
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typedef struct {
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PyObject_HEAD
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Py_ssize_t s_size;
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Py_ssize_t s_len;
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formatcode *s_codes;
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PyObject *s_format;
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PyObject *weakreflist; /* List of weak references */
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} PyStructObject;
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#define PyStruct_Check(op) PyObject_TypeCheck(op, &PyStructType)
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#define PyStruct_CheckExact(op) (Py_TYPE(op) == &PyStructType)
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/* Exception */
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static PyObject *StructError;
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/* Define various structs to figure out the alignments of types */
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typedef struct { char c; short x; } st_short;
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typedef struct { char c; int x; } st_int;
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typedef struct { char c; long x; } st_long;
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typedef struct { char c; float x; } st_float;
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typedef struct { char c; double x; } st_double;
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typedef struct { char c; void *x; } st_void_p;
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#define SHORT_ALIGN (sizeof(st_short) - sizeof(short))
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#define INT_ALIGN (sizeof(st_int) - sizeof(int))
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#define LONG_ALIGN (sizeof(st_long) - sizeof(long))
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#define FLOAT_ALIGN (sizeof(st_float) - sizeof(float))
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#define DOUBLE_ALIGN (sizeof(st_double) - sizeof(double))
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#define VOID_P_ALIGN (sizeof(st_void_p) - sizeof(void *))
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/* We can't support q and Q in native mode unless the compiler does;
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in std mode, they're 8 bytes on all platforms. */
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#ifdef HAVE_LONG_LONG
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typedef struct { char c; PY_LONG_LONG x; } s_long_long;
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#define LONG_LONG_ALIGN (sizeof(s_long_long) - sizeof(PY_LONG_LONG))
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#endif
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#ifdef HAVE_C99_BOOL
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#define BOOL_TYPE _Bool
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typedef struct { char c; _Bool x; } s_bool;
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#define BOOL_ALIGN (sizeof(s_bool) - sizeof(BOOL_TYPE))
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#else
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#define BOOL_TYPE char
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#define BOOL_ALIGN 0
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#endif
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#define STRINGIFY(x) #x
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#ifdef __powerc
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#pragma options align=reset
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#endif
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/* Helper to get a PyLongObject. Caller should decref. */
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static PyObject *
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get_pylong(PyObject *v)
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{
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assert(v != NULL);
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if (!PyLong_Check(v)) {
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PyErr_SetString(StructError,
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"required argument is not an integer");
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return NULL;
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}
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Py_INCREF(v);
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return v;
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}
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/* Helper routine to get a C long and raise the appropriate error if it isn't
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one */
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static int
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get_long(PyObject *v, long *p)
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{
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long x;
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if (!PyLong_Check(v)) {
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PyErr_SetString(StructError,
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"required argument is not an integer");
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return -1;
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}
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x = PyLong_AsLong(v);
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if (x == -1 && PyErr_Occurred()) {
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if (PyErr_ExceptionMatches(PyExc_OverflowError))
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PyErr_SetString(StructError,
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"argument out of range");
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return -1;
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}
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*p = x;
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return 0;
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}
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/* Same, but handling unsigned long */
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#ifndef PY_STRUCT_OVERFLOW_MASKING
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static int
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get_ulong(PyObject *v, unsigned long *p)
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{
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unsigned long x;
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if (!PyLong_Check(v)) {
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PyErr_SetString(StructError,
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"required argument is not an integer");
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return -1;
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}
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x = PyLong_AsUnsignedLong(v);
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if (x == (unsigned long)-1 && PyErr_Occurred()) {
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if (PyErr_ExceptionMatches(PyExc_OverflowError))
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PyErr_SetString(StructError,
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"argument out of range");
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return -1;
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}
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*p = x;
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return 0;
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}
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#endif /* PY_STRUCT_OVERFLOW_MASKING */
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#ifdef HAVE_LONG_LONG
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/* Same, but handling native long long. */
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static int
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get_longlong(PyObject *v, PY_LONG_LONG *p)
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{
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PY_LONG_LONG x;
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if (!PyLong_Check(v)) {
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PyErr_SetString(StructError,
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"required argument is not an integer");
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return -1;
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}
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x = PyLong_AsLongLong(v);
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if (x == -1 && PyErr_Occurred()) {
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if (PyErr_ExceptionMatches(PyExc_OverflowError))
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PyErr_SetString(StructError,
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"argument out of range");
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return -1;
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}
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*p = x;
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return 0;
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}
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/* Same, but handling native unsigned long long. */
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static int
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get_ulonglong(PyObject *v, unsigned PY_LONG_LONG *p)
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{
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unsigned PY_LONG_LONG x;
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if (!PyLong_Check(v)) {
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PyErr_SetString(StructError,
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"required argument is not an integer");
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return -1;
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}
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x = PyLong_AsUnsignedLongLong(v);
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if (x == -1 && PyErr_Occurred()) {
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if (PyErr_ExceptionMatches(PyExc_OverflowError))
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PyErr_SetString(StructError,
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"argument out of range");
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return -1;
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}
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*p = x;
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return 0;
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}
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#endif
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#define RANGE_ERROR(x, f, flag, mask) return _range_error(f, flag)
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/* Floating point helpers */
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static PyObject *
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unpack_float(const char *p, /* start of 4-byte string */
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int le) /* true for little-endian, false for big-endian */
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{
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double x;
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x = _PyFloat_Unpack4((unsigned char *)p, le);
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if (x == -1.0 && PyErr_Occurred())
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return NULL;
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return PyFloat_FromDouble(x);
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}
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static PyObject *
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unpack_double(const char *p, /* start of 8-byte string */
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int le) /* true for little-endian, false for big-endian */
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{
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double x;
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x = _PyFloat_Unpack8((unsigned char *)p, le);
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if (x == -1.0 && PyErr_Occurred())
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return NULL;
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return PyFloat_FromDouble(x);
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}
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/* Helper to format the range error exceptions */
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static int
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_range_error(const formatdef *f, int is_unsigned)
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{
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/* ulargest is the largest unsigned value with f->size bytes.
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* Note that the simpler:
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* ((size_t)1 << (f->size * 8)) - 1
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* doesn't work when f->size == sizeof(size_t) because C doesn't
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* define what happens when a left shift count is >= the number of
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* bits in the integer being shifted; e.g., on some boxes it doesn't
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* shift at all when they're equal.
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*/
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const size_t ulargest = (size_t)-1 >> ((SIZEOF_SIZE_T - f->size)*8);
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assert(f->size >= 1 && f->size <= SIZEOF_SIZE_T);
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if (is_unsigned)
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PyErr_Format(StructError,
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"'%c' format requires 0 <= number <= %zu",
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f->format,
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ulargest);
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else {
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const Py_ssize_t largest = (Py_ssize_t)(ulargest >> 1);
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PyErr_Format(StructError,
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"'%c' format requires %zd <= number <= %zd",
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f->format,
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~ largest,
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largest);
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}
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return -1;
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}
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/* A large number of small routines follow, with names of the form
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[bln][up]_TYPE
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[bln] distiguishes among big-endian, little-endian and native.
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[pu] distiguishes between pack (to struct) and unpack (from struct).
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TYPE is one of char, byte, ubyte, etc.
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*/
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/* Native mode routines. ****************************************************/
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/* NOTE:
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In all n[up]_<type> routines handling types larger than 1 byte, there is
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*no* guarantee that the p pointer is properly aligned for each type,
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therefore memcpy is called. An intermediate variable is used to
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compensate for big-endian architectures.
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Normally both the intermediate variable and the memcpy call will be
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skipped by C optimisation in little-endian architectures (gcc >= 2.91
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does this). */
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static PyObject *
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nu_char(const char *p, const formatdef *f)
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{
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return PyBytes_FromStringAndSize(p, 1);
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}
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static PyObject *
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nu_byte(const char *p, const formatdef *f)
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{
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return PyLong_FromLong((long) *(signed char *)p);
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}
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static PyObject *
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nu_ubyte(const char *p, const formatdef *f)
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{
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return PyLong_FromLong((long) *(unsigned char *)p);
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}
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static PyObject *
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nu_short(const char *p, const formatdef *f)
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{
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short x;
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memcpy((char *)&x, p, sizeof x);
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return PyLong_FromLong((long)x);
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}
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static PyObject *
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nu_ushort(const char *p, const formatdef *f)
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{
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unsigned short x;
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memcpy((char *)&x, p, sizeof x);
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return PyLong_FromLong((long)x);
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}
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static PyObject *
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nu_int(const char *p, const formatdef *f)
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{
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int x;
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memcpy((char *)&x, p, sizeof x);
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return PyLong_FromLong((long)x);
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}
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static PyObject *
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nu_uint(const char *p, const formatdef *f)
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{
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unsigned int x;
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memcpy((char *)&x, p, sizeof x);
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#if (SIZEOF_LONG > SIZEOF_INT)
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return PyLong_FromLong((long)x);
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#else
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if (x <= ((unsigned int)LONG_MAX))
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return PyLong_FromLong((long)x);
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return PyLong_FromUnsignedLong((unsigned long)x);
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#endif
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}
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static PyObject *
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nu_long(const char *p, const formatdef *f)
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{
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long x;
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memcpy((char *)&x, p, sizeof x);
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return PyLong_FromLong(x);
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}
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static PyObject *
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nu_ulong(const char *p, const formatdef *f)
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{
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unsigned long x;
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memcpy((char *)&x, p, sizeof x);
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if (x <= LONG_MAX)
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return PyLong_FromLong((long)x);
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return PyLong_FromUnsignedLong(x);
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}
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/* Native mode doesn't support q or Q unless the platform C supports
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long long (or, on Windows, __int64). */
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#ifdef HAVE_LONG_LONG
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static PyObject *
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nu_longlong(const char *p, const formatdef *f)
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{
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PY_LONG_LONG x;
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memcpy((char *)&x, p, sizeof x);
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if (x >= LONG_MIN && x <= LONG_MAX)
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return PyLong_FromLong(Py_SAFE_DOWNCAST(x, PY_LONG_LONG, long));
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return PyLong_FromLongLong(x);
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}
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static PyObject *
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nu_ulonglong(const char *p, const formatdef *f)
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{
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unsigned PY_LONG_LONG x;
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memcpy((char *)&x, p, sizeof x);
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if (x <= LONG_MAX)
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return PyLong_FromLong(Py_SAFE_DOWNCAST(x, unsigned PY_LONG_LONG, long));
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return PyLong_FromUnsignedLongLong(x);
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}
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#endif
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static PyObject *
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nu_bool(const char *p, const formatdef *f)
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{
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BOOL_TYPE x;
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memcpy((char *)&x, p, sizeof x);
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return PyBool_FromLong(x != 0);
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}
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static PyObject *
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nu_float(const char *p, const formatdef *f)
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{
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float x;
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memcpy((char *)&x, p, sizeof x);
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return PyFloat_FromDouble((double)x);
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}
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static PyObject *
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nu_double(const char *p, const formatdef *f)
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{
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double x;
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memcpy((char *)&x, p, sizeof x);
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return PyFloat_FromDouble(x);
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}
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static PyObject *
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nu_void_p(const char *p, const formatdef *f)
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{
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void *x;
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memcpy((char *)&x, p, sizeof x);
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return PyLong_FromVoidPtr(x);
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}
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static int
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np_byte(char *p, PyObject *v, const formatdef *f)
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{
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long x;
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if (get_long(v, &x) < 0)
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return -1;
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if (x < -128 || x > 127){
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PyErr_SetString(StructError,
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"byte format requires -128 <= number <= 127");
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return -1;
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}
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*p = (char)x;
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return 0;
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}
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static int
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np_ubyte(char *p, PyObject *v, const formatdef *f)
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{
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long x;
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if (get_long(v, &x) < 0)
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return -1;
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if (x < 0 || x > 255){
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PyErr_SetString(StructError,
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"ubyte format requires 0 <= number <= 255");
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return -1;
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}
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*p = (char)x;
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return 0;
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}
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static int
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np_char(char *p, PyObject *v, const formatdef *f)
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{
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if (PyUnicode_Check(v)) {
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v = _PyUnicode_AsDefaultEncodedString(v, NULL);
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if (v == NULL)
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return -1;
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}
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if (!PyBytes_Check(v) || PyBytes_Size(v) != 1) {
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PyErr_SetString(StructError,
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"char format requires bytes or string of length 1");
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return -1;
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}
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*p = *PyBytes_AsString(v);
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return 0;
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}
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static int
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np_short(char *p, PyObject *v, const formatdef *f)
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{
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long x;
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short y;
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if (get_long(v, &x) < 0)
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return -1;
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if (x < SHRT_MIN || x > SHRT_MAX){
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PyErr_SetString(StructError,
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"short format requires " STRINGIFY(SHRT_MIN)
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" <= number <= " STRINGIFY(SHRT_MAX));
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return -1;
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}
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y = (short)x;
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memcpy(p, (char *)&y, sizeof y);
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return 0;
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}
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static int
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np_ushort(char *p, PyObject *v, const formatdef *f)
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{
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long x;
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unsigned short y;
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if (get_long(v, &x) < 0)
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return -1;
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if (x < 0 || x > USHRT_MAX){
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PyErr_SetString(StructError,
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"ushort format requires 0 <= number <= " STRINGIFY(USHRT_MAX));
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return -1;
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}
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y = (unsigned short)x;
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memcpy(p, (char *)&y, sizeof y);
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return 0;
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}
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static int
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np_int(char *p, PyObject *v, const formatdef *f)
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{
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long x;
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int y;
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if (get_long(v, &x) < 0)
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return -1;
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#if (SIZEOF_LONG > SIZEOF_INT)
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if ((x < ((long)INT_MIN)) || (x > ((long)INT_MAX)))
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RANGE_ERROR(x, f, 0, -1);
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#endif
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y = (int)x;
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memcpy(p, (char *)&y, sizeof y);
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return 0;
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}
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static int
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np_uint(char *p, PyObject *v, const formatdef *f)
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{
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unsigned long x;
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unsigned int y;
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if (get_ulong(v, &x) < 0)
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return -1;
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y = (unsigned int)x;
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#if (SIZEOF_LONG > SIZEOF_INT)
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if (x > ((unsigned long)UINT_MAX))
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RANGE_ERROR(y, f, 1, -1);
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#endif
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memcpy(p, (char *)&y, sizeof y);
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return 0;
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}
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static int
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np_long(char *p, PyObject *v, const formatdef *f)
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{
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long x;
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if (get_long(v, &x) < 0)
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return -1;
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memcpy(p, (char *)&x, sizeof x);
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return 0;
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}
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static int
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np_ulong(char *p, PyObject *v, const formatdef *f)
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{
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unsigned long x;
|
|
if (get_ulong(v, &x) < 0)
|
|
return -1;
|
|
memcpy(p, (char *)&x, sizeof x);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_LONG_LONG
|
|
|
|
static int
|
|
np_longlong(char *p, PyObject *v, const formatdef *f)
|
|
{
|
|
PY_LONG_LONG x;
|
|
if (get_longlong(v, &x) < 0)
|
|
return -1;
|
|
memcpy(p, (char *)&x, sizeof x);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
np_ulonglong(char *p, PyObject *v, const formatdef *f)
|
|
{
|
|
unsigned PY_LONG_LONG x;
|
|
if (get_ulonglong(v, &x) < 0)
|
|
return -1;
|
|
memcpy(p, (char *)&x, sizeof x);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
|
|
static int
|
|
np_bool(char *p, PyObject *v, const formatdef *f)
|
|
{
|
|
BOOL_TYPE y;
|
|
y = PyObject_IsTrue(v);
|
|
memcpy(p, (char *)&y, sizeof y);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
np_float(char *p, PyObject *v, const formatdef *f)
|
|
{
|
|
float x = (float)PyFloat_AsDouble(v);
|
|
if (x == -1 && PyErr_Occurred()) {
|
|
PyErr_SetString(StructError,
|
|
"required argument is not a float");
|
|
return -1;
|
|
}
|
|
memcpy(p, (char *)&x, sizeof x);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
np_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;
|
|
}
|
|
memcpy(p, (char *)&x, sizeof(double));
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
np_void_p(char *p, PyObject *v, const formatdef *f)
|
|
{
|
|
void *x;
|
|
|
|
v = get_pylong(v);
|
|
if (v == NULL)
|
|
return -1;
|
|
assert(PyLong_Check(v));
|
|
x = PyLong_AsVoidPtr(v);
|
|
Py_DECREF(v);
|
|
if (x == NULL && PyErr_Occurred())
|
|
return -1;
|
|
memcpy(p, (char *)&x, sizeof x);
|
|
return 0;
|
|
}
|
|
|
|
static formatdef native_table[] = {
|
|
{'x', sizeof(char), 0, NULL},
|
|
{'b', sizeof(char), 0, nu_byte, np_byte},
|
|
{'B', sizeof(char), 0, nu_ubyte, np_ubyte},
|
|
{'c', sizeof(char), 0, nu_char, np_char},
|
|
{'s', sizeof(char), 0, NULL},
|
|
{'p', sizeof(char), 0, NULL},
|
|
{'h', sizeof(short), SHORT_ALIGN, nu_short, np_short},
|
|
{'H', sizeof(short), SHORT_ALIGN, nu_ushort, np_ushort},
|
|
{'i', sizeof(int), INT_ALIGN, nu_int, np_int},
|
|
{'I', sizeof(int), INT_ALIGN, nu_uint, np_uint},
|
|
{'l', sizeof(long), LONG_ALIGN, nu_long, np_long},
|
|
{'L', sizeof(long), LONG_ALIGN, nu_ulong, np_ulong},
|
|
#ifdef HAVE_LONG_LONG
|
|
{'q', sizeof(PY_LONG_LONG), LONG_LONG_ALIGN, nu_longlong, np_longlong},
|
|
{'Q', sizeof(PY_LONG_LONG), LONG_LONG_ALIGN, nu_ulonglong,np_ulonglong},
|
|
#endif
|
|
{'?', sizeof(BOOL_TYPE), BOOL_ALIGN, nu_bool, np_bool},
|
|
{'f', sizeof(float), FLOAT_ALIGN, nu_float, np_float},
|
|
{'d', sizeof(double), DOUBLE_ALIGN, nu_double, np_double},
|
|
{'P', sizeof(void *), VOID_P_ALIGN, nu_void_p, np_void_p},
|
|
{0}
|
|
};
|
|
|
|
/* Big-endian routines. *****************************************************/
|
|
|
|
static PyObject *
|
|
bu_int(const char *p, const formatdef *f)
|
|
{
|
|
long x = 0;
|
|
Py_ssize_t i = f->size;
|
|
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 PyLong_FromLong(x);
|
|
}
|
|
|
|
static PyObject *
|
|
bu_uint(const char *p, const formatdef *f)
|
|
{
|
|
unsigned long x = 0;
|
|
Py_ssize_t i = f->size;
|
|
const unsigned char *bytes = (const unsigned char *)p;
|
|
do {
|
|
x = (x<<8) | *bytes++;
|
|
} while (--i > 0);
|
|
if (x <= LONG_MAX)
|
|
return PyLong_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->size;
|
|
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 & ((PY_LONG_LONG)1 << ((8 * f->size) - 1)));
|
|
if (x >= LONG_MIN && x <= LONG_MAX)
|
|
return PyLong_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->size;
|
|
const unsigned char *bytes = (const unsigned char *)p;
|
|
do {
|
|
x = (x<<8) | *bytes++;
|
|
} while (--i > 0);
|
|
if (x <= LONG_MAX)
|
|
return PyLong_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);
|
|
}
|
|
|
|
static PyObject *
|
|
bu_bool(const char *p, const formatdef *f)
|
|
{
|
|
char x;
|
|
memcpy((char *)&x, p, sizeof x);
|
|
return PyBool_FromLong(x != 0);
|
|
}
|
|
|
|
static int
|
|
bp_int(char *p, PyObject *v, const formatdef *f)
|
|
{
|
|
long x;
|
|
Py_ssize_t i;
|
|
if (get_long(v, &x) < 0)
|
|
return -1;
|
|
i = f->size;
|
|
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
|
|
}
|
|
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_ulong(v, &x) < 0)
|
|
return -1;
|
|
i = f->size;
|
|
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);
|
|
}
|
|
|
|
static int
|
|
bp_bool(char *p, PyObject *v, const formatdef *f)
|
|
{
|
|
char y;
|
|
y = PyObject_IsTrue(v);
|
|
memcpy(p, (char *)&y, sizeof y);
|
|
return 0;
|
|
}
|
|
|
|
static formatdef bigendian_table[] = {
|
|
{'x', 1, 0, NULL},
|
|
{'b', 1, 0, nu_byte, np_byte},
|
|
{'B', 1, 0, nu_ubyte, np_ubyte},
|
|
{'c', 1, 0, nu_char, np_char},
|
|
{'s', 1, 0, NULL},
|
|
{'p', 1, 0, NULL},
|
|
{'h', 2, 0, bu_int, bp_int},
|
|
{'H', 2, 0, bu_uint, bp_uint},
|
|
{'i', 4, 0, bu_int, bp_int},
|
|
{'I', 4, 0, bu_uint, bp_uint},
|
|
{'l', 4, 0, bu_int, bp_int},
|
|
{'L', 4, 0, bu_uint, bp_uint},
|
|
{'q', 8, 0, bu_longlong, bp_longlong},
|
|
{'Q', 8, 0, bu_ulonglong, bp_ulonglong},
|
|
{'?', 1, 0, bu_bool, bp_bool},
|
|
{'f', 4, 0, bu_float, bp_float},
|
|
{'d', 8, 0, bu_double, bp_double},
|
|
{0}
|
|
};
|
|
|
|
/* Little-endian routines. *****************************************************/
|
|
|
|
static PyObject *
|
|
lu_int(const char *p, const formatdef *f)
|
|
{
|
|
long x = 0;
|
|
Py_ssize_t i = f->size;
|
|
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 PyLong_FromLong(x);
|
|
}
|
|
|
|
static PyObject *
|
|
lu_uint(const char *p, const formatdef *f)
|
|
{
|
|
unsigned long x = 0;
|
|
Py_ssize_t i = f->size;
|
|
const unsigned char *bytes = (const unsigned char *)p;
|
|
do {
|
|
x = (x<<8) | bytes[--i];
|
|
} while (i > 0);
|
|
if (x <= LONG_MAX)
|
|
return PyLong_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->size;
|
|
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 & ((PY_LONG_LONG)1 << ((8 * f->size) - 1)));
|
|
if (x >= LONG_MIN && x <= LONG_MAX)
|
|
return PyLong_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->size;
|
|
const unsigned char *bytes = (const unsigned char *)p;
|
|
do {
|
|
x = (x<<8) | bytes[--i];
|
|
} while (i > 0);
|
|
if (x <= LONG_MAX)
|
|
return PyLong_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);
|
|
}
|
|
|
|
static int
|
|
lp_int(char *p, PyObject *v, const formatdef *f)
|
|
{
|
|
long x;
|
|
Py_ssize_t i;
|
|
if (get_long(v, &x) < 0)
|
|
return -1;
|
|
i = f->size;
|
|
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
|
|
}
|
|
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_ulong(v, &x) < 0)
|
|
return -1;
|
|
i = f->size;
|
|
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 formatdef lilendian_table[] = {
|
|
{'x', 1, 0, NULL},
|
|
{'b', 1, 0, nu_byte, np_byte},
|
|
{'B', 1, 0, nu_ubyte, np_ubyte},
|
|
{'c', 1, 0, nu_char, np_char},
|
|
{'s', 1, 0, NULL},
|
|
{'p', 1, 0, NULL},
|
|
{'h', 2, 0, lu_int, lp_int},
|
|
{'H', 2, 0, lu_uint, lp_uint},
|
|
{'i', 4, 0, lu_int, lp_int},
|
|
{'I', 4, 0, lu_uint, lp_uint},
|
|
{'l', 4, 0, lu_int, lp_int},
|
|
{'L', 4, 0, lu_uint, lp_uint},
|
|
{'q', 8, 0, lu_longlong, lp_longlong},
|
|
{'Q', 8, 0, lu_ulonglong, lp_ulonglong},
|
|
{'?', 1, 0, bu_bool, bp_bool}, /* Std rep not endian dep,
|
|
but potentially different from native rep -- reuse bx_bool funcs. */
|
|
{'f', 4, 0, lu_float, lp_float},
|
|
{'d', 8, 0, lu_double, lp_double},
|
|
{0}
|
|
};
|
|
|
|
|
|
static const formatdef *
|
|
whichtable(char **pfmt)
|
|
{
|
|
const char *fmt = (*pfmt)++; /* May be backed out of later */
|
|
switch (*fmt) {
|
|
case '<':
|
|
return lilendian_table;
|
|
case '>':
|
|
case '!': /* Network byte order is big-endian */
|
|
return bigendian_table;
|
|
case '=': { /* Host byte order -- different from native in aligment! */
|
|
int n = 1;
|
|
char *p = (char *) &n;
|
|
if (*p == 1)
|
|
return lilendian_table;
|
|
else
|
|
return bigendian_table;
|
|
}
|
|
default:
|
|
--*pfmt; /* Back out of pointer increment */
|
|
/* Fall through */
|
|
case '@':
|
|
return native_table;
|
|
}
|
|
}
|
|
|
|
|
|
/* 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 = PyBytes_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;
|
|
}
|
|
}
|
|
|
|
/* check for overflow */
|
|
if ((len + 1) > (PY_SSIZE_T_MAX / sizeof(formatcode))) {
|
|
PyErr_NoMemory();
|
|
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, "O:Struct", kwlist,
|
|
&o_format))
|
|
return -1;
|
|
|
|
if (PyUnicode_Check(o_format)) {
|
|
o_format = PyUnicode_AsASCIIString(o_format);
|
|
if (o_format == NULL)
|
|
return -1;
|
|
}
|
|
/* XXX support buffer interface, too */
|
|
else {
|
|
Py_INCREF(o_format);
|
|
}
|
|
|
|
if (!PyBytes_Check(o_format)) {
|
|
Py_DECREF(o_format);
|
|
PyErr_Format(PyExc_TypeError,
|
|
"Struct() argument 1 must be bytes, not %.200s",
|
|
Py_TYPE(o_format)->tp_name);
|
|
return -1;
|
|
}
|
|
|
|
Py_CLEAR(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);
|
|
Py_TYPE(s)->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 = PyBytes_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 = PyBytes_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(buffer) -> (v1, v2, ...)\n\
|
|
\n\
|
|
Return tuple containing values unpacked according to this Struct's format.\n\
|
|
Requires len(buffer) == self.size. See struct.__doc__ for more on format\n\
|
|
strings.");
|
|
|
|
static PyObject *
|
|
s_unpack(PyObject *self, PyObject *input)
|
|
{
|
|
Py_buffer vbuf;
|
|
PyObject *result;
|
|
PyStructObject *soself = (PyStructObject *)self;
|
|
|
|
assert(PyStruct_Check(self));
|
|
assert(soself->s_codes != NULL);
|
|
if (PyObject_GetBuffer(input, &vbuf, PyBUF_SIMPLE) < 0)
|
|
return NULL;
|
|
if (vbuf.len != soself->s_size) {
|
|
PyErr_Format(StructError,
|
|
"unpack requires a bytes argument of length %zd",
|
|
soself->s_size);
|
|
PyBuffer_Release(&vbuf);
|
|
return NULL;
|
|
}
|
|
result = s_unpack_internal(soself, vbuf.buf);
|
|
PyBuffer_Release(&vbuf);
|
|
return result;
|
|
}
|
|
|
|
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};
|
|
|
|
PyObject *input;
|
|
Py_ssize_t offset = 0;
|
|
Py_buffer vbuf;
|
|
PyObject *result;
|
|
PyStructObject *soself = (PyStructObject *)self;
|
|
|
|
assert(PyStruct_Check(self));
|
|
assert(soself->s_codes != NULL);
|
|
|
|
if (!PyArg_ParseTupleAndKeywords(args, kwds,
|
|
"O|n:unpack_from", kwlist,
|
|
&input, &offset))
|
|
return NULL;
|
|
if (PyObject_GetBuffer(input, &vbuf, PyBUF_SIMPLE) < 0)
|
|
return NULL;
|
|
if (offset < 0)
|
|
offset += vbuf.len;
|
|
if (offset < 0 || vbuf.len - offset < soself->s_size) {
|
|
PyErr_Format(StructError,
|
|
"unpack_from requires a buffer of at least %zd bytes",
|
|
soself->s_size);
|
|
PyBuffer_Release(&vbuf);
|
|
return NULL;
|
|
}
|
|
result = s_unpack_internal(soself, (char*)vbuf.buf + offset);
|
|
PyBuffer_Release(&vbuf);
|
|
return result;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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') {
|
|
int isstring;
|
|
void *p;
|
|
if (PyUnicode_Check(v)) {
|
|
v = _PyUnicode_AsDefaultEncodedString(v, NULL);
|
|
if (v == NULL)
|
|
return -1;
|
|
}
|
|
isstring = PyBytes_Check(v);
|
|
if (!isstring && !PyByteArray_Check(v)) {
|
|
PyErr_SetString(StructError,
|
|
"argument for 's' must be a bytes or string");
|
|
return -1;
|
|
}
|
|
if (isstring) {
|
|
n = PyBytes_GET_SIZE(v);
|
|
p = PyBytes_AS_STRING(v);
|
|
}
|
|
else {
|
|
n = PyByteArray_GET_SIZE(v);
|
|
p = PyByteArray_AS_STRING(v);
|
|
}
|
|
if (n > code->size)
|
|
n = code->size;
|
|
if (n > 0)
|
|
memcpy(res, p, n);
|
|
} else if (e->format == 'p') {
|
|
int isstring;
|
|
void *p;
|
|
if (PyUnicode_Check(v)) {
|
|
v = _PyUnicode_AsDefaultEncodedString(v, NULL);
|
|
if (v == NULL)
|
|
return -1;
|
|
}
|
|
isstring = PyBytes_Check(v);
|
|
if (!isstring && !PyByteArray_Check(v)) {
|
|
PyErr_SetString(StructError,
|
|
"argument for 'p' must be a bytes or string");
|
|
return -1;
|
|
}
|
|
if (isstring) {
|
|
n = PyBytes_GET_SIZE(v);
|
|
p = PyBytes_AS_STRING(v);
|
|
}
|
|
else {
|
|
n = PyByteArray_GET_SIZE(v);
|
|
p = PyByteArray_AS_STRING(v);
|
|
}
|
|
if (n > (code->size - 1))
|
|
n = code->size - 1;
|
|
if (n > 0)
|
|
memcpy(res + 1, p, 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, ...) -> bytes\n\
|
|
\n\
|
|
Return a bytes 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 = PyBytes_FromStringAndSize((char *)NULL, soself->s_size);
|
|
if (result == NULL)
|
|
return NULL;
|
|
|
|
/* Call the guts */
|
|
if ( s_pack_internal(soself, args, 0, PyBytes_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 = PyNumber_AsSsize_t(PyTuple_GET_ITEM(args, 1), PyExc_IndexError);
|
|
if (offset == -1 && PyErr_Occurred())
|
|
return NULL;
|
|
|
|
/* 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 PyLong_FromSsize_t(self->s_size);
|
|
}
|
|
|
|
/* 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_VARARGS|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},
|
|
{NULL} /* sentinel */
|
|
};
|
|
|
|
static
|
|
PyTypeObject PyStructType = {
|
|
PyVarObject_HEAD_INIT(NULL, 0)
|
|
"Struct",
|
|
sizeof(PyStructObject),
|
|
0,
|
|
(destructor)s_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_reserved */
|
|
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 */
|
|
PyType_GenericAlloc,/* tp_alloc */
|
|
s_new, /* tp_new */
|
|
PyObject_Del, /* tp_free */
|
|
};
|
|
|
|
|
|
/* ---- Standalone functions ---- */
|
|
|
|
#define MAXCACHE 100
|
|
static PyObject *cache = NULL;
|
|
|
|
static PyObject *
|
|
cache_struct(PyObject *fmt)
|
|
{
|
|
PyObject * s_object;
|
|
|
|
if (cache == NULL) {
|
|
cache = PyDict_New();
|
|
if (cache == NULL)
|
|
return NULL;
|
|
}
|
|
|
|
s_object = PyDict_GetItem(cache, fmt);
|
|
if (s_object != NULL) {
|
|
Py_INCREF(s_object);
|
|
return s_object;
|
|
}
|
|
|
|
s_object = PyObject_CallFunctionObjArgs((PyObject *)(&PyStructType), fmt, NULL);
|
|
if (s_object != NULL) {
|
|
if (PyDict_Size(cache) >= MAXCACHE)
|
|
PyDict_Clear(cache);
|
|
/* Attempt to cache the result */
|
|
if (PyDict_SetItem(cache, fmt, s_object) == -1)
|
|
PyErr_Clear();
|
|
}
|
|
return s_object;
|
|
}
|
|
|
|
PyDoc_STRVAR(clearcache_doc,
|
|
"Clear the internal cache.");
|
|
|
|
static PyObject *
|
|
clearcache(PyObject *self)
|
|
{
|
|
Py_CLEAR(cache);
|
|
Py_RETURN_NONE;
|
|
}
|
|
|
|
PyDoc_STRVAR(calcsize_doc,
|
|
"Return size of C struct described by format string fmt.");
|
|
|
|
static PyObject *
|
|
calcsize(PyObject *self, PyObject *fmt)
|
|
{
|
|
Py_ssize_t n;
|
|
PyObject *s_object = cache_struct(fmt);
|
|
if (s_object == NULL)
|
|
return NULL;
|
|
n = ((PyStructObject *)s_object)->s_size;
|
|
Py_DECREF(s_object);
|
|
return PyLong_FromSsize_t(n);
|
|
}
|
|
|
|
PyDoc_STRVAR(pack_doc,
|
|
"Return bytes containing values v1, v2, ... packed according to fmt.");
|
|
|
|
static PyObject *
|
|
pack(PyObject *self, PyObject *args)
|
|
{
|
|
PyObject *s_object, *fmt, *newargs, *result;
|
|
Py_ssize_t n = PyTuple_GET_SIZE(args);
|
|
|
|
if (n == 0) {
|
|
PyErr_SetString(PyExc_TypeError, "missing format argument");
|
|
return NULL;
|
|
}
|
|
fmt = PyTuple_GET_ITEM(args, 0);
|
|
newargs = PyTuple_GetSlice(args, 1, n);
|
|
if (newargs == NULL)
|
|
return NULL;
|
|
|
|
s_object = cache_struct(fmt);
|
|
if (s_object == NULL) {
|
|
Py_DECREF(newargs);
|
|
return NULL;
|
|
}
|
|
result = s_pack(s_object, newargs);
|
|
Py_DECREF(newargs);
|
|
Py_DECREF(s_object);
|
|
return result;
|
|
}
|
|
|
|
PyDoc_STRVAR(pack_into_doc,
|
|
"Pack the values v1, v2, ... according to fmt.\n\
|
|
Write the packed bytes into the writable buffer buf starting at offset.");
|
|
|
|
static PyObject *
|
|
pack_into(PyObject *self, PyObject *args)
|
|
{
|
|
PyObject *s_object, *fmt, *newargs, *result;
|
|
Py_ssize_t n = PyTuple_GET_SIZE(args);
|
|
|
|
if (n == 0) {
|
|
PyErr_SetString(PyExc_TypeError, "missing format argument");
|
|
return NULL;
|
|
}
|
|
fmt = PyTuple_GET_ITEM(args, 0);
|
|
newargs = PyTuple_GetSlice(args, 1, n);
|
|
if (newargs == NULL)
|
|
return NULL;
|
|
|
|
s_object = cache_struct(fmt);
|
|
if (s_object == NULL) {
|
|
Py_DECREF(newargs);
|
|
return NULL;
|
|
}
|
|
result = s_pack_into(s_object, newargs);
|
|
Py_DECREF(newargs);
|
|
Py_DECREF(s_object);
|
|
return result;
|
|
}
|
|
|
|
PyDoc_STRVAR(unpack_doc,
|
|
"Unpack the bytes containing packed C structure data, according to fmt.\n\
|
|
Requires len(bytes) == calcsize(fmt).");
|
|
|
|
static PyObject *
|
|
unpack(PyObject *self, PyObject *args)
|
|
{
|
|
PyObject *s_object, *fmt, *inputstr, *result;
|
|
|
|
if (!PyArg_UnpackTuple(args, "unpack", 2, 2, &fmt, &inputstr))
|
|
return NULL;
|
|
|
|
s_object = cache_struct(fmt);
|
|
if (s_object == NULL)
|
|
return NULL;
|
|
result = s_unpack(s_object, inputstr);
|
|
Py_DECREF(s_object);
|
|
return result;
|
|
}
|
|
|
|
PyDoc_STRVAR(unpack_from_doc,
|
|
"Unpack the buffer, containing packed C structure data, according to\n\
|
|
fmt, starting at offset. Requires len(buffer[offset:]) >= calcsize(fmt).");
|
|
|
|
static PyObject *
|
|
unpack_from(PyObject *self, PyObject *args, PyObject *kwds)
|
|
{
|
|
PyObject *s_object, *fmt, *newargs, *result;
|
|
Py_ssize_t n = PyTuple_GET_SIZE(args);
|
|
|
|
if (n == 0) {
|
|
PyErr_SetString(PyExc_TypeError, "missing format argument");
|
|
return NULL;
|
|
}
|
|
fmt = PyTuple_GET_ITEM(args, 0);
|
|
newargs = PyTuple_GetSlice(args, 1, n);
|
|
if (newargs == NULL)
|
|
return NULL;
|
|
|
|
s_object = cache_struct(fmt);
|
|
if (s_object == NULL) {
|
|
Py_DECREF(newargs);
|
|
return NULL;
|
|
}
|
|
result = s_unpack_from(s_object, newargs, kwds);
|
|
Py_DECREF(newargs);
|
|
Py_DECREF(s_object);
|
|
return result;
|
|
}
|
|
|
|
static struct PyMethodDef module_functions[] = {
|
|
{"_clearcache", (PyCFunction)clearcache, METH_NOARGS, clearcache_doc},
|
|
{"calcsize", calcsize, METH_O, calcsize_doc},
|
|
{"pack", pack, METH_VARARGS, pack_doc},
|
|
{"pack_into", pack_into, METH_VARARGS, pack_into_doc},
|
|
{"unpack", unpack, METH_VARARGS, unpack_doc},
|
|
{"unpack_from", (PyCFunction)unpack_from,
|
|
METH_VARARGS|METH_KEYWORDS, unpack_from_doc},
|
|
{NULL, NULL} /* sentinel */
|
|
};
|
|
|
|
|
|
/* Module initialization */
|
|
|
|
PyDoc_STRVAR(module_doc,
|
|
"Functions to convert between Python values and C structs.\n\
|
|
Python bytes objects are used to hold the data representing the C struct\n\
|
|
and also as format strings (explained below) to describe the layout of data\n\
|
|
in the C struct.\n\
|
|
\n\
|
|
The optional first format char indicates byte order, size and alignment:\n\
|
|
@: native order, size & alignment (default)\n\
|
|
=: native order, std. size & alignment\n\
|
|
<: little-endian, std. size & alignment\n\
|
|
>: big-endian, std. size & alignment\n\
|
|
!: same as >\n\
|
|
\n\
|
|
The remaining chars indicate types of args and must match exactly;\n\
|
|
these can be preceded by a decimal repeat count:\n\
|
|
x: pad byte (no data); c:char; b:signed byte; B:unsigned byte;\n\
|
|
?: _Bool (requires C99; if not available, char is used instead)\n\
|
|
h:short; H:unsigned short; i:int; I:unsigned int;\n\
|
|
l:long; L:unsigned long; f:float; d:double.\n\
|
|
Special cases (preceding decimal count indicates length):\n\
|
|
s:string (array of char); p: pascal string (with count byte).\n\
|
|
Special case (only available in native format):\n\
|
|
P:an integer type that is wide enough to hold a pointer.\n\
|
|
Special case (not in native mode unless 'long long' in platform C):\n\
|
|
q:long long; Q:unsigned long long\n\
|
|
Whitespace between formats is ignored.\n\
|
|
\n\
|
|
The variable struct.error is an exception raised on errors.\n");
|
|
|
|
|
|
static struct PyModuleDef _structmodule = {
|
|
PyModuleDef_HEAD_INIT,
|
|
"_struct",
|
|
module_doc,
|
|
-1,
|
|
module_functions,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
PyMODINIT_FUNC
|
|
PyInit__struct(void)
|
|
{
|
|
PyObject *ver, *m;
|
|
|
|
ver = PyBytes_FromString("0.3");
|
|
if (ver == NULL)
|
|
return NULL;
|
|
|
|
m = PyModule_Create(&_structmodule);
|
|
if (m == NULL)
|
|
return NULL;
|
|
|
|
Py_TYPE(&PyStructType) = &PyType_Type;
|
|
if (PyType_Ready(&PyStructType) < 0)
|
|
return NULL;
|
|
|
|
/* Check endian and swap in faster functions */
|
|
{
|
|
int one = 1;
|
|
formatdef *native = native_table;
|
|
formatdef *other, *ptr;
|
|
if ((int)*(unsigned char*)&one)
|
|
other = lilendian_table;
|
|
else
|
|
other = bigendian_table;
|
|
/* Scan through the native table, find a matching
|
|
entry in the endian table and swap in the
|
|
native implementations whenever possible
|
|
(64-bit platforms may not have "standard" sizes) */
|
|
while (native->format != '\0' && other->format != '\0') {
|
|
ptr = other;
|
|
while (ptr->format != '\0') {
|
|
if (ptr->format == native->format) {
|
|
/* Match faster when formats are
|
|
listed in the same order */
|
|
if (ptr == other)
|
|
other++;
|
|
/* Only use the trick if the
|
|
size matches */
|
|
if (ptr->size != native->size)
|
|
break;
|
|
/* Skip float and double, could be
|
|
"unknown" float format */
|
|
if (ptr->format == 'd' || ptr->format == 'f')
|
|
break;
|
|
ptr->pack = native->pack;
|
|
ptr->unpack = native->unpack;
|
|
break;
|
|
}
|
|
ptr++;
|
|
}
|
|
native++;
|
|
}
|
|
}
|
|
|
|
/* Add some symbolic constants to the module */
|
|
if (StructError == NULL) {
|
|
StructError = PyErr_NewException("struct.error", NULL, NULL);
|
|
if (StructError == NULL)
|
|
return NULL;
|
|
}
|
|
|
|
Py_INCREF(StructError);
|
|
PyModule_AddObject(m, "error", StructError);
|
|
|
|
Py_INCREF((PyObject*)&PyStructType);
|
|
PyModule_AddObject(m, "Struct", (PyObject*)&PyStructType);
|
|
|
|
PyModule_AddObject(m, "__version__", ver);
|
|
|
|
return m;
|
|
}
|