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/**************************************************************************
*
* Copyright 2012 Jose Fonseca
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
/*
* Python pickle writer
*/
#ifndef _PICKLE_HPP_
#define _PICKLE_HPP_
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <ostream>
#include <string>
class PickleWriter
{
private:
std::ostream &os;
/*
* Python pickle opcodes. See pickle.py and pickletools.py from Python
* standard library for details.
*/
enum Opcode {
MARK = '(',
STOP = '.',
POP = '0',
POP_MARK = '1',
DUP = '2',
FLOAT = 'F',
INT = 'I',
BININT = 'J',
BININT1 = 'K',
LONG = 'L',
BININT2 = 'M',
NONE = 'N',
PERSID = 'P',
BINPERSID = 'Q',
REDUCE = 'R',
STRING = 'S',
BINSTRING = 'T',
SHORT_BINSTRING = 'U',
UNICODE = 'V',
BINUNICODE = 'X',
APPEND = 'a',
BUILD = 'b',
GLOBAL = 'c',
DICT = 'd',
EMPTY_DICT = '}',
APPENDS = 'e',
GET = 'g',
BINGET = 'h',
INST = 'i',
LONG_BINGET = 'j',
LIST = 'l',
EMPTY_LIST = ']',
OBJ = 'o',
PUT = 'p',
BINPUT = 'q',
LONG_BINPUT = 'r',
SETITEM = 's',
TUPLE = 't',
EMPTY_TUPLE = ')',
SETITEMS = 'u',
BINFLOAT = 'G',
PROTO = '\x80',
NEWOBJ = '\x81',
EXT1 = '\x82',
EXT2 = '\x83',
EXT4 = '\x84',
TUPLE1 = '\x85',
TUPLE2 = '\x86',
TUPLE3 = '\x87',
NEWTRUE = '\x88',
NEWFALSE = '\x89',
LONG1 = '\x8a',
LONG4 = '\x8b',
};
public:
PickleWriter(std::ostream &_os) :
os(_os) {
}
inline void begin() {
os.put(PROTO);
os.put(2);
}
inline void end() {
os.put(STOP);
}
inline void beginDict() {
os.put(EMPTY_DICT);
os.put(BINPUT);
os.put(1);
}
inline void endDict() {
}
inline void beginItem() {
}
inline void beginItem(const char * name) {
writeString(name);
}
inline void beginItem(const std::string &name) {
beginItem(name.c_str());
}
inline void endItem(void) {
os.put(SETITEM);
}
inline void beginList() {
os.put(EMPTY_LIST);
os.put(BINPUT);
os.put(1);
os.put(MARK);
}
inline void endList(void) {
os.put(APPENDS);
}
inline void beginTuple() {
os.put(MARK);
}
inline void endTuple(void) {
os.put(TUPLE);
}
inline void writeString(const char *s, size_t length) {
if (!s) {
writeNone();
return;
}
if (length < 256) {
os.put(SHORT_BINSTRING);
os.put(length);
} else {
os.put(BINSTRING);
putInt32(length);
}
os.write(s, length);
os.put(BINPUT);
os.put(1);
}
inline void writeString(const char *s) {
if (!s) {
writeNone();
return;
}
writeString(s, strlen(s));
}
inline void writeString(const std::string &s) {
writeString(s.c_str(), s.size());
}
inline void writeNone(void) {
os.put(NONE);
}
inline void writeBool(bool b) {
os.put(b ? NEWTRUE : NEWFALSE);
}
inline void writeInt(uint8_t i) {
os.put(BININT1);
os.put(i);
}
inline void writeInt(uint16_t i) {
if (i < 0x100) {
writeInt((uint8_t)i);
} else {
os.put(BININT2);
putInt16(i);
}
}
inline void writeInt(int32_t i) {
if (0 <= i && i < 0x10000) {
writeInt((uint16_t)i);
} else {
os.put(BININT);
putInt32(i);
}
}
inline void writeInt(uint32_t i) {
if (i < 0x8000000) {
writeInt((int32_t)i);
} else {
writeLong(i);
}
}
inline void writeInt(long long i) {
if (-0x8000000 <= i && i < 0x8000000) {
writeInt((int32_t)i);
} else {
writeLong(i);
}
}
inline void writeInt(unsigned long long i) {
if (i < 0x8000000) {
writeInt((int32_t)i);
} else {
writeLong(i);
}
}
inline void writeFloat(double f) {
union {
double f;
char c[8];
} u;
assert(sizeof u.f == sizeof u.c);
u.f = f;
os.put(BINFLOAT);
os.put(u.c[7]);
os.put(u.c[6]);
os.put(u.c[5]);
os.put(u.c[4]);
os.put(u.c[3]);
os.put(u.c[2]);
os.put(u.c[1]);
os.put(u.c[0]);
}
inline void writeByteArray(const void *buf, size_t length) {
os.put(GLOBAL);
os << "__builtin__\nbytearray\n";
os.put(BINPUT);
os.put(1);
writeString(static_cast<const char *>(buf), length);
os.put(TUPLE1);
os.put(REDUCE);
}
protected:
inline void putInt16(uint16_t i) {
os.put( i & 0xff);
os.put( i >> 8 );
}
inline void putInt32(uint32_t i) {
os.put( i & 0xff);
os.put((i >> 8) & 0xff);
os.put((i >> 16) & 0xff);
os.put( i >> 24 );
}
template< class T >
inline void writeLong(T l) {
os.put(LONG1);
if (l == 0) {
os.put(0);
return;
}
// Same as l >> (8 * sizeof l), but without the warnings
T sign = l < 0 ? ~0 : 0;
T sl = l;
unsigned c = 0;
do {
++c;
} while (sl >>= 8 != sign);
// Add an extra byte if sign bit doesn't match
if (((l >> (8 * c - 1)) & 1) != ((l >> (8 * sizeof l - 1)) & 1)) {
++c;
}
os.put(c);
for (unsigned i = 0; i < c; ++ i) {
os.put(l & 0xff);
l >>= 8;
}
}
};
#endif /* _Pickle_HPP_ */
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