Edwin Smith
87 linhas
3.2 KiB
C++
87 linhas
3.2 KiB
C++
/*
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+----------------------------------------------------------------------+
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| HipHop for PHP |
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+----------------------------------------------------------------------+
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| Copyright (c) 2010-2013 Facebook, Inc. (http://www.facebook.com) |
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| Copyright (c) 1998-2010 Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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*/
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#ifndef incl_HPHP_ZEND_PACK_H_
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#define incl_HPHP_ZEND_PACK_H_
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#include "hphp/runtime/base/types.h"
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namespace HPHP {
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///////////////////////////////////////////////////////////////////////////////
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// pack/unpack
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/**
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* Implemented formats are A, a, h, H, c, C, s, S, i, I, l, L, n, N, f, d,
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* x, X, @.
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*/
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class ZendPack {
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public:
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ZendPack();
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/**
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* Takes one or more arguments and packs them into a binary string according
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* to the format argument. pack() idea stolen from Perl (implemented formats
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* behave the same as there).
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*/
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Variant pack(CStrRef fmt, CArrRef argv);
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/**
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* Unpack binary string into named array elements according to format
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* argument.
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*
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* unpack() is based on Perl's unpack(), but is modified a bit from there.
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* Rather than depending on error-prone ordered lists or syntactically
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* unpleasant pass-by-reference, we return an object with named paramters
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* (like *_fetch_object()). Syntax is "f[repeat]name/...", where "f" is the
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* formatter char (like pack()), "[repeat]" is the optional repeater
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* argument, and "name" is the name of the variable to use.
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* Example: "c2chars/nints" will return an object with fields
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* chars1, chars2, and ints.
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* Numeric pack types will return numbers, a and A will return strings,
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* f and d will return doubles.
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*/
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Variant unpack(CStrRef fmt, CStrRef data);
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private:
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// Whether machine is little endian
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char machine_little_endian;
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// Mapping of byte from char (8bit) to int32 for machine endian
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int byte_map[1];
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// Mappings of bytes from int (machine dependant) to int for machine endian
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int int_map[sizeof(int)];
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// Mappings of bytes from shorts (16bit) for all endian environments
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int machine_endian_short_map[2];
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int big_endian_short_map[2];
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int little_endian_short_map[2];
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// Mappings of bytes from int32s (32bit) for all endian environments
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int machine_endian_int32_map[4];
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int big_endian_int32_map[4];
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int little_endian_int32_map[4];
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void pack(CVarRef val, int size, int *map, char *output);
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int32_t unpack(const char *data, int size, int issigned, int *map);
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};
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///////////////////////////////////////////////////////////////////////////////
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}
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#endif // incl_HPHP_ZEND_PACK_H_
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