lua-msgpack/lua_msgpack.c at master · clongeau/lua-msgpack · GitHub

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#include <math.h>

#include <stdlib.h>

#include <stdint.h>

#include <string.h>

#include <assert.h>

#include "lua.h"

#include "lauxlib.h"

/* ==============================================================================

* MessagePack implementation and bindings for Lua 5.1.

* http://github.com/antirez/luamsgpack

* For MessagePack specification check the following web site:

* http://wiki.msgpack.org/display/MSGPACK/Format+specification

* See Copyright Notice at the end of this file.

* CHANGELOG:

* 19-Feb-2012 (ver 0.1): Initial release.

* ============================================================================ */

/* --------------------------- Endian conversion --------------------------------

* We use it only for floats and doubles, all the other conversions are performed

* in an endian independent fashion. So the only thing we need is a function

* that swaps a binary string if the arch is little endian (and left it untouched

* otherwise). */

/* Reverse memory bytes if arch is little endian. Given the conceptual

* simplicity of the Lua build system we prefer to check for endianess at runtime.

* The performance difference should be acceptable. */

static void memrevifle(void *ptr, size_t len) {

unsigned char *p = ptr, *e = p+len-1, aux;

int test = 1;

unsigned char *testp = (unsigned char*) &test;

if (testp[0] == 0) return; /* Big endian, nothign to do. */

len /= 2;

while(len--) {

aux = *p;

*p = *e;

*e = aux;

p++;

e--;

}

/* ----------------------------- String buffer ----------------------------------

* This is a simple implementation of string buffers. The only opereation

* supported is creating empty buffers and appending bytes to it.

* The string buffer uses 2x preallocation on every realloc for O(N) append

* behavior. */

typedef struct mp_buf {

unsigned char *b;

size_t len, free;

} mp_buf;

static mp_buf *mp_buf_new(void) {

mp_buf *buf = malloc(sizeof(*buf));

buf->b = NULL;

buf->len = buf->free = 0;

return buf;

}

void mp_buf_append(mp_buf *buf, const unsigned char *s, size_t len) {

if (buf->free < len) {

size_t newlen = buf->len+len;

buf->b = realloc(buf->b,newlen*2);

buf->free = newlen;

}

memcpy(buf->b+buf->len,s,len);

buf->len += len;

buf->free -= len;

}

void mp_buf_free(mp_buf *buf) {

free(buf->b);

free(buf);

}

/* ------------------------------ String cursor ----------------------------------

* This simple data structure is used for parsing. Basically you create a cursor

* using a string pointer and a length, then it is possible to access the

* current string position with cursor->p, check the remaining length

* in cursor->left, and finally consume more string using

* mp_cur_consume(cursor,len), to advance 'p' and subtract 'left'.

* An additional field cursor->error is set to zero on initialization and can

* be used to report errors. */

#define MP_CUR_ERROR_NONE 0

#define MP_CUR_ERROR_EOF 1 /* Not enough data to complete the opereation. */

#define MP_CUR_ERROR_BADFMT 2 /* Bad data format */

typedef struct mp_cur {

const unsigned char *p;

size_t left;

int err;

} mp_cur;

static mp_cur *mp_cur_new(const unsigned char *s, size_t len) {

mp_cur *cursor = malloc(sizeof(*cursor));

cursor->p = s;

cursor->left = len;

cursor->err = MP_CUR_ERROR_NONE;

return cursor;

}

static void mp_cur_free(mp_cur *cursor) {

free(cursor);

}

#define mp_cur_consume(_c,_len) do { _c->p += _len; _c->left -= _len; } while(0)

/* When there is not enough room we set an error in the cursor and return, this

* is very common across the code so we have a macro to make the code look

* a bit simpler. */

#define mp_cur_need(_c,_len) do { \

if (_c->left < _len) { \

_c->err = MP_CUR_ERROR_EOF; \

return; \

} \

} while(0)

/* --------------------------- Low level MP encoding -------------------------- */

static void mp_encode_bytes(mp_buf *buf, const unsigned char *s, size_t len) {

unsigned char hdr[5];

int hdrlen;

if (len < 32) {

hdr[0] = 0xa0 | (len&0xff); /* fix raw */

hdrlen = 1;

} else if (len <= 0xffff) {

hdr[0] = 0xda;

hdr[1] = (len&0xff00)>>8;

hdr[2] = len&0xff;

hdrlen = 3;

} else {

hdr[0] = 0xdb;

hdr[1] = (len&0xff000000)>>24;

hdr[2] = (len&0xff0000)>>16;

hdr[3] = (len&0xff00)>>8;

hdr[4] = len&0xff;

hdrlen = 5;

}

mp_buf_append(buf,hdr,hdrlen);

mp_buf_append(buf,s,len);

}

/* we assume IEEE 754 internal format for single and double precision floats. */

static void mp_encode_double(mp_buf *buf, double d) {

unsigned char b[9];

float f = d;

assert(sizeof(f) == 4 && sizeof(d) == 8);

if (d == (double)f) {

b[0] = 0xca; /* float IEEE 754 */

memcpy(b+1,&f,4);

memrevifle(b+1,4);

mp_buf_append(buf,b,5);

} else if (sizeof(d) == 8) {

b[0] = 0xcb; /* double IEEE 754 */

memcpy(b+1,&d,8);

memrevifle(b+1,8);

mp_buf_append(buf,b,9);

}

static void mp_encode_int(mp_buf *buf, int64_t n) {

unsigned char b[9];

int enclen;

if (n >= 0) {

if (n <= 127) {

b[0] = n & 0x7f; /* positive fixnum */

enclen = 1;

} else if (n <= 0xff) {

b[0] = 0xcc; /* uint 8 */

b[1] = n & 0xff;

enclen = 2;

} else if (n <= 0xffff) {

b[0] = 0xcd; /* uint 16 */

b[1] = (n & 0xff00) >> 8;

b[2] = n & 0xff;

enclen = 3;

} else if (n <= 0xffffffffLL) {

b[0] = 0xce; /* uint 32 */

b[1] = (n & 0xff000000) >> 24;

b[2] = (n & 0xff0000) >> 16;

b[3] = (n & 0xff00) >> 8;

b[4] = n & 0xff;

enclen = 5;

} else {

b[0] = 0xcf; /* uint 64 */

b[1] = (n & 0xff00000000000000) >> 56;

b[2] = (n & 0xff000000000000) >> 48;

b[3] = (n & 0xff0000000000) >> 40;

b[4] = (n & 0xff00000000) >> 32;

b[5] = (n & 0xff000000) >> 24;

b[6] = (n & 0xff0000) >> 16;

b[7] = (n & 0xff00) >> 8;

b[8] = n & 0xff;

enclen = 9;

}

} else {

if (n >= -32) {

b[0] = ((char)n); /* negative fixnum */

enclen = 1;

} else if (n >= -128) {

b[0] = 0xd0; /* int 8 */

b[1] = n & 0xff;

enclen = 2;

} else if (n >= -32768) {

b[0] = 0xd1; /* int 16 */

b[1] = (n & 0xff00) >> 8;

b[2] = n & 0xff;

enclen = 3;

} else if (n >= -2147483648) {

b[0] = 0xd2; /* int 32 */

b[1] = (n & 0xff000000) >> 24;

b[2] = (n & 0xff0000) >> 16;

b[3] = (n & 0xff00) >> 8;

b[4] = n & 0xff;

enclen = 5;

} else {

b[0] = 0xd3; /* int 64 */

b[1] = (n & 0xff00000000000000) >> 56;

b[2] = (n & 0xff000000000000) >> 48;

b[3] = (n & 0xff0000000000) >> 40;

b[4] = (n & 0xff00000000) >> 32;

b[5] = (n & 0xff000000) >> 24;

b[6] = (n & 0xff0000) >> 16;

b[7] = (n & 0xff00) >> 8;

b[8] = n & 0xff;

enclen = 9;

}

mp_buf_append(buf,b,enclen);

}

static void mp_encode_array(mp_buf *buf, int64_t n) {

unsigned char b[5];

int enclen;

if (n <= 15) {

b[0] = 0x90 | (n & 0xf); /* fix array */

enclen = 1;

} else if (n <= 65535) {

b[0] = 0xdc; /* array 16 */

b[1] = (n & 0xff00) >> 8;

b[2] = n & 0xff;

enclen = 3;

} else {

b[0] = 0xdd; /* array 32 */

b[1] = (n & 0xff000000) >> 24;

b[2] = (n & 0xff0000) >> 16;

b[3] = (n & 0xff00) >> 8;

b[4] = n & 0xff;

enclen = 5;

}

mp_buf_append(buf,b,enclen);

}

static void mp_encode_map(mp_buf *buf, int64_t n) {

unsigned char b[5];

int enclen;

if (n <= 15) {

b[0] = 0x80 | (n & 0xf); /* fix map */

enclen = 1;

} else if (n <= 65535) {

b[0] = 0xde; /* map 16 */

b[1] = (n & 0xff00) >> 8;

b[2] = n & 0xff;

enclen = 3;

} else {

b[0] = 0xdf; /* map 32 */

b[1] = (n & 0xff000000) >> 24;

b[2] = (n & 0xff0000) >> 16;

b[3] = (n & 0xff00) >> 8;

b[4] = n & 0xff;

enclen = 5;

}

mp_buf_append(buf,b,enclen);

}

/* ----------------------------- Lua types encoding --------------------------- */

static void mp_encode_lua_string(lua_State *L, mp_buf *buf) {

size_t len;

const char *s;

s = lua_tolstring(L,-1,&len);

mp_encode_bytes(buf,(const unsigned char*)s,len);

}

static void mp_encode_lua_bool(lua_State *L, mp_buf *buf) {

unsigned char b = lua_toboolean(L,-1) ? 0xc3 : 0xc2;

mp_buf_append(buf,&b,1);

}

static void mp_encode_lua_number(lua_State *L, mp_buf *buf) {

lua_Number n = lua_tonumber(L,-1);

if (floor(n) != n) {

mp_encode_double(buf,(double)n);

} else {

mp_encode_int(buf,(int64_t)n);

}

static void mp_encode_lua_type(lua_State *L, mp_buf *buf);

/* Convert a lua table into a message pack list. */

static void mp_encode_lua_table_as_array(lua_State *L, mp_buf *buf) {

size_t len = lua_objlen(L,-1), j;

mp_encode_array(buf,len);

for (j = 1; j <= len; j++) {

lua_pushnumber(L,j);

lua_gettable(L,-2);

mp_encode_lua_type(L,buf);

}

/* Convert a lua table into a message pack key-value map. */

static void mp_encode_lua_table_as_map(lua_State *L, mp_buf *buf) {

size_t len = 0;

/* First step: count keys into table. No other way to do it with the

* Lua API, we need to iterate a first time. Note that an alternative

* would be to do a single run, and then hack the buffer to insert the

* map opcodes for message pack. Too hachish for this lib. */

lua_pushnil(L);

while(lua_next(L,-2)) {

lua_pop(L,1); /* remove value, keep key for next iteration. */

len++;

}

/* Step two: actually encoding of the map. */

mp_encode_map(buf,len);

lua_pushnil(L);

while(lua_next(L,-2)) {

/* Stack: ... key value */

lua_pushvalue(L,-2); /* Stack: ... key value key */

mp_encode_lua_type(L,buf); /* encode key */

mp_encode_lua_type(L,buf); /* encode val */

}

/* If the length operator returns non-zero, that is, there is at least

* an object at key '1', we serialize to message pack list. Otherwise

* we use a map. */

static void mp_encode_lua_table(lua_State *L, mp_buf *buf) {

if (lua_objlen(L,-1))

mp_encode_lua_table_as_array(L,buf);

else

mp_encode_lua_table_as_map(L,buf);

}

static void mp_encode_lua_null(lua_State *L, mp_buf *buf) {

unsigned char b[1];

b[0] = 0xc0;

mp_buf_append(buf,b,1);

}

static void mp_encode_lua_type(lua_State *L, mp_buf *buf) {

int t = lua_type(L,-1);

switch(t) {

case LUA_TSTRING: mp_encode_lua_string(L,buf); break;

case LUA_TBOOLEAN: mp_encode_lua_bool(L,buf); break;

case LUA_TNUMBER: mp_encode_lua_number(L,buf); break;

case LUA_TTABLE: mp_encode_lua_table(L,buf); break;

default: mp_encode_lua_null(L,buf); break;

}

lua_pop(L,1);

}

static int mp_pack(lua_State *L) {

mp_buf *buf = mp_buf_new();

mp_encode_lua_type(L,buf);

lua_pushlstring(L,(char*)buf->b,buf->len);

mp_buf_free(buf);

return 1;

}

/* --------------------------------- Decoding --------------------------------- */

void mp_decode_to_lua_type(lua_State *L, mp_cur *c);

void mp_decode_to_lua_array(lua_State *L, mp_cur *c, size_t len) {

int index = 1;

lua_newtable(L);

while(len--) {

lua_pushnumber(L,index++);

mp_decode_to_lua_type(L,c);

if (c->err) return;

lua_settable(L,-3);

}

void mp_decode_to_lua_hash(lua_State *L, mp_cur *c, size_t len) {

lua_newtable(L);

while(len--) {

mp_decode_to_lua_type(L,c); /* key */

if (c->err) return;

mp_decode_to_lua_type(L,c); /* value */

if (c->err) return;

lua_settable(L,-3);

}

/* Decode a Message Pack raw object pointed by the string cursor 'c' to

* a Lua type, that is left as the only result on the stack. */

void mp_decode_to_lua_type(lua_State *L, mp_cur *c) {

mp_cur_need(c,1);

switch(c->p[0]) {

case 0xcc: /* uint 8 */

mp_cur_need(c,2);

lua_pushnumber(L,c->p[1]);

mp_cur_consume(c,2);

break;

case 0xd0: /* int 8 */

mp_cur_need(c,2);

lua_pushnumber(L,(char)c->p[1]);

mp_cur_consume(c,2);

break;

case 0xcd: /* uint 16 */

mp_cur_need(c,3);

lua_pushnumber(L,

(c->p[1] << 8) |

c->p[2]);

mp_cur_consume(c,3);

break;

case 0xd1: /* int 16 */

mp_cur_need(c,3);

lua_pushnumber(L,(int16_t)

(c->p[1] << 8) |

c->p[2]);

mp_cur_consume(c,3);

break;

case 0xce: /* uint 32 */

mp_cur_need(c,5);

lua_pushnumber(L,

((uint32_t)c->p[1] << 24) |

((uint32_t)c->p[2] << 16) |

((uint32_t)c->p[3] << 8) |

(uint32_t)c->p[4]);

mp_cur_consume(c,5);

break;

case 0xd2: /* int 32 */

mp_cur_need(c,5);

lua_pushnumber(L,

((int32_t)c->p[1] << 24) |

((int32_t)c->p[2] << 16) |

((int32_t)c->p[3] << 8) |

(int32_t)c->p[4]);

mp_cur_consume(c,5);

break;

case 0xcf: /* uint 64 */

mp_cur_need(c,9);

lua_pushnumber(L,

((uint64_t)c->p[1] << 56) |

((uint64_t)c->p[2] << 48) |

((uint64_t)c->p[3] << 40) |

((uint64_t)c->p[4] << 32) |

((uint64_t)c->p[5] << 24) |

((uint64_t)c->p[6] << 16) |

((uint64_t)c->p[7] << 8) |

(uint64_t)c->p[8]);

mp_cur_consume(c,9);

break;

case 0xd3: /* int 64 */

mp_cur_need(c,9);

lua_pushnumber(L,

((int64_t)c->p[1] << 56) |

((int64_t)c->p[2] << 48) |

((int64_t)c->p[3] << 40) |

((int64_t)c->p[4] << 32) |

((int64_t)c->p[5] << 24) |

((int64_t)c->p[6] << 16) |

((int64_t)c->p[7] << 8) |

(int64_t)c->p[8]);

mp_cur_consume(c,9);

break;

case 0xc0: /* nil */

lua_pushnil(L);

mp_cur_consume(c,1);

break;

case 0xc3: /* true */

lua_pushboolean(L,1);

mp_cur_consume(c,1);

break;

case 0xc2: /* false */

lua_pushboolean(L,0);

mp_cur_consume(c,1);

break;

case 0xca: /* float */

mp_cur_need(c,5);

assert(sizeof(float) == 4);

{

float f;

memcpy(&f,c->p+1,4);

memrevifle(&f,4);

lua_pushnumber(L,f);

mp_cur_consume(c,5);

}

break;

case 0xcb: /* double */

mp_cur_need(c,9);

assert(sizeof(double) == 8);

{

double d;

memcpy(&d,c->p+1,8);

memrevifle(&d,8);

lua_pushnumber(L,d);

mp_cur_consume(c,9);

}

break;

case 0xda: /* raw 16 */

mp_cur_need(c,3);

{

size_t l = (c->p[1] << 8) | c->p[2];

mp_cur_need(c,3+l);

lua_pushlstring(L,(char*)c->p+3,l);

mp_cur_consume(c,3+l);

}

break;

case 0xdb: /* raw 32 */

mp_cur_need(c,5);

{

size_t l = (c->p[1] << 24) |

(c->p[2] << 16) |

(c->p[3] << 8) |

c->p[4];

mp_cur_need(c,5+l);

lua_pushlstring(L,(char*)c->p+5,l);

mp_cur_consume(c,5+l);

}

break;

case 0xdc: /* array 16 */

mp_cur_need(c,3);

{

size_t l = (c->p[1] << 8) | c->p[2];

mp_cur_consume(c,3);

mp_decode_to_lua_array(L,c,l);

}

break;

case 0xdd: /* array 32 */

mp_cur_need(c,5);

{

size_t l = (c->p[1] << 24) |

(c->p[2] << 16) |

(c->p[3] << 8) |

c->p[4];

mp_cur_consume(c,5);

mp_decode_to_lua_array(L,c,l);

}

break;

case 0xde: /* map 16 */

mp_cur_need(c,3);

{

size_t l = (c->p[1] << 8) | c->p[2];

mp_cur_consume(c,3);

mp_decode_to_lua_hash(L,c,l);

}

break;

case 0xdf: /* map 32 */

mp_cur_need(c,5);

{

size_t l = (c->p[1] << 24) |

(c->p[2] << 16) |

(c->p[3] << 8) |

c->p[4];

mp_cur_consume(c,5);

mp_decode_to_lua_hash(L,c,l);

}

break;

default: /* types that can't be idenitified by first byte value. */

if ((c->p[0] & 0x80) == 0) { /* positive fixnum */

lua_pushnumber(L,c->p[0]);

mp_cur_consume(c,1);

} else if ((c->p[0] & 0xe0) == 0xe0) { /* negative fixnum */

lua_pushnumber(L,(signed char)c->p[0]);

mp_cur_consume(c,1);

} else if ((c->p[0] & 0xe0) == 0xa0) { /* fix raw */

size_t l = c->p[0] & 0x1f;

mp_cur_need(c,1+l);

lua_pushlstring(L,(char*)c->p+1,l);

mp_cur_consume(c,1+l);

} else if ((c->p[0] & 0xf0) == 0x90) { /* fix map */

size_t l = c->p[0] & 0xf;

mp_cur_consume(c,1);

mp_decode_to_lua_array(L,c,l);

} else if ((c->p[0] & 0xf0) == 0x80) { /* fix map */

size_t l = c->p[0] & 0xf;

mp_cur_consume(c,1);

mp_decode_to_lua_hash(L,c,l);

} else {

c->err = MP_CUR_ERROR_BADFMT;

}

static int mp_unpack(lua_State *L) {

size_t len;

const unsigned char *s;

mp_cur *c;

if (!lua_isstring(L,-1)) {

lua_pushstring(L,"MessagePack decoding needs a string as input.");

lua_error(L);

}

s = (const unsigned char*) lua_tolstring(L,-1,&len);

c = mp_cur_new(s,len);

mp_decode_to_lua_type(L,c);

if (c->err == MP_CUR_ERROR_EOF) {

mp_cur_free(c);

lua_pushstring(L,"Missing bytes in input.");

lua_error(L);

} else if (c->err == MP_CUR_ERROR_BADFMT) {

mp_cur_free(c);

lua_pushstring(L,"Bad data format in input.");

lua_error(L);

} else if (c->left != 0) {

mp_cur_free(c);

lua_pushstring(L,"Extra bytes in input.");

lua_error(L);

}

mp_cur_free(c);

return 1;

}

/* ---------------------------------------------------------------------------- */

static const struct luaL_reg thislib[] = {

{"pack", mp_pack},

{"unpack", mp_unpack},

{NULL, NULL}

};

LUALIB_API int luaopen_msgpack (lua_State *L) {

luaL_register(L, "msgpack", thislib);

return 1;

}

/******************************************************************************

* 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.

******************************************************************************/

lua-msgpack/lua_msgpack.c at master · clongeau/lua-msgpack · GitHub

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