ltask/src/lua-seri.c at master · cloudwu/ltask · GitHub

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modify from https://github.com/cloudwu/lua-serialize

#ifdef TEST_SERI

#define LUA_LIB

#endif

#include <lua.h>

#include <lauxlib.h>

#include <stdlib.h>

#include <stdint.h>

#include <assert.h>

#include <string.h>

#define TYPE_BOOLEAN 0

#define TYPE_BOOLEAN_NIL 0

#define TYPE_BOOLEAN_FALSE 1

#define TYPE_BOOLEAN_TRUE 2

// hibits 0 false 1 true

#define TYPE_NUMBER 1

// hibits 0 : 0 , 1: byte, 2:word, 4: dword, 6: qword, 8 : double

#define TYPE_NUMBER_ZERO 0

#define TYPE_NUMBER_BYTE 1

#define TYPE_NUMBER_WORD 2

#define TYPE_NUMBER_DWORD 4

#define TYPE_NUMBER_QWORD 6

#define TYPE_NUMBER_REAL 8

#define TYPE_USERDATA 2

// hibits 0 : void *

// hibits 1 : c function

#define TYPE_USERDATA_POINTER 0

#define TYPE_USERDATA_CFUNCTION 1

#define TYPE_SHORT_STRING 3

// hibits 0~31 : len

#define TYPE_LONG_STRING 4

// hibits 0~30 : array size , 31 : extend size

#define TYPE_TABLE 5

#define TYPE_TABLE_MARK 6

// hibits 0~30 : ref ancestor id , 31 : extend id ( number )

#define TYPE_REF 7

#define MAX_COOKIE 32

#define EXTEND_NUMBER (MAX_COOKIE-1)

#define COMBINE_TYPE(t,v) ((t) | (v) << 3)

#define BLOCK_SIZE 128

#define MAX_DEPTH 31

#define MAX_REFERENCE 32

struct block {

struct block * next;

char buffer[BLOCK_SIZE];

};

struct stack {

int depth;

int ref_index;

int objectid;

int ancestor[MAX_DEPTH];

};

struct reference {

const void * object;

uint8_t * address;

};

struct write_block {

struct block * head;

struct block * current;

int len;

int ptr;

struct stack s;

struct reference r[MAX_REFERENCE];

};

struct read_block {

char * buffer;

int len;

int ptr;

struct stack s;

};

inline static struct block *

blk_alloc(void) {

struct block *b = malloc(sizeof(struct block));

b->next = NULL;

return b;

}

static inline void

wb_push(struct write_block *b, const void *buf, int sz) {

const char * buffer = buf;

if (b->ptr >= BLOCK_SIZE) {

_again:

b->current = b->current->next = blk_alloc();

b->ptr = 0;

}

if (b->ptr <= BLOCK_SIZE - sz) {

memcpy(b->current->buffer + b->ptr, buffer, sz);

b->ptr+=sz;

b->len+=sz;

} else {

int copy = BLOCK_SIZE - b->ptr;

memcpy(b->current->buffer + b->ptr, buffer, copy);

buffer += copy;

b->len += copy;

sz -= copy;

goto _again;

}

static inline void *

wb_address(struct write_block *b) {

if (b->ptr == BLOCK_SIZE) {

b->current = b->current->next = blk_alloc();

b->ptr = 0;

}

return (void *)(b->current->buffer + b->ptr);

}

static inline void

init_stack(struct stack *s) {

s->depth = 0;

s->objectid = 0;

s->ref_index = 0;

}

static void

wb_init(struct write_block *wb , struct block *b) {

wb->head = b;

assert(b->next == NULL);

wb->len = 0;

wb->current = wb->head;

wb->ptr = 0;

init_stack(&wb->s);

}

static void

wb_free(struct write_block *wb) {

struct block *blk = wb->head;

blk = blk->next; // the first block is on stack

while (blk) {

struct block * next = blk->next;

free(blk);

blk = next;

}

wb->head = NULL;

wb->current = NULL;

wb->ptr = 0;

wb->len = 0;

}

static void

rball_init(struct read_block * rb, char * buffer, int size) {

rb->buffer = buffer;

rb->len = size;

rb->ptr = 0;

init_stack(&rb->s);

}

static const void *

rb_read(struct read_block *rb, int sz) {

if (rb->len < sz) {

return NULL;

}

int ptr = rb->ptr;

rb->ptr += sz;

rb->len -= sz;

return rb->buffer + ptr;

}

static inline void

wb_nil(struct write_block *wb) {

uint8_t n = COMBINE_TYPE(TYPE_BOOLEAN , TYPE_BOOLEAN_NIL);

wb_push(wb, &n, 1);

}

static inline void

wb_boolean(struct write_block *wb, int boolean) {

uint8_t n = COMBINE_TYPE(TYPE_BOOLEAN , boolean ? TYPE_BOOLEAN_TRUE : TYPE_BOOLEAN_FALSE);

wb_push(wb, &n, 1);

}

static inline void

wb_integer(struct write_block *wb, lua_Integer v) {

int type = TYPE_NUMBER;

if (v == 0) {

uint8_t n = COMBINE_TYPE(type , TYPE_NUMBER_ZERO);

wb_push(wb, &n, 1);

} else if (v != (int32_t)v) {

uint8_t n = COMBINE_TYPE(type , TYPE_NUMBER_QWORD);

int64_t v64 = v;

wb_push(wb, &n, 1);

wb_push(wb, &v64, sizeof(v64));

} else if (v < 0) {

int32_t v32 = (int32_t)v;

uint8_t n = COMBINE_TYPE(type , TYPE_NUMBER_DWORD);

wb_push(wb, &n, 1);

wb_push(wb, &v32, sizeof(v32));

} else if (v<0x100) {

uint8_t n = COMBINE_TYPE(type , TYPE_NUMBER_BYTE);

wb_push(wb, &n, 1);

uint8_t byte = (uint8_t)v;

wb_push(wb, &byte, sizeof(byte));

} else if (v<0x10000) {

uint8_t n = COMBINE_TYPE(type , TYPE_NUMBER_WORD);

wb_push(wb, &n, 1);

uint16_t word = (uint16_t)v;

wb_push(wb, &word, sizeof(word));

} else {

uint8_t n = COMBINE_TYPE(type , TYPE_NUMBER_DWORD);

wb_push(wb, &n, 1);

uint32_t v32 = (uint32_t)v;

wb_push(wb, &v32, sizeof(v32));

}

static inline void

wb_real(struct write_block *wb, double v) {

uint8_t n = COMBINE_TYPE(TYPE_NUMBER , TYPE_NUMBER_REAL);

wb_push(wb, &n, 1);

wb_push(wb, &v, sizeof(v));

}

static inline void

wb_pointer(struct write_block *wb, void *v, int subtype) {

uint8_t n = COMBINE_TYPE(TYPE_USERDATA, subtype);

wb_push(wb, &n, 1);

wb_push(wb, &v, sizeof(v));

}

static inline void

wb_string(struct write_block *wb, const char *str, size_t len) {

if (len < MAX_COOKIE) {

uint8_t n = COMBINE_TYPE(TYPE_SHORT_STRING, len);

wb_push(wb, &n, 1);

if (len > 0) {

wb_push(wb, str, len);

}

} else {

uint8_t n;

if (len < 0x10000) {

n = COMBINE_TYPE(TYPE_LONG_STRING, 2);

wb_push(wb, &n, 1);

uint16_t x = (uint16_t) len;

wb_push(wb, &x, 2);

} else {

n = COMBINE_TYPE(TYPE_LONG_STRING, 4);

wb_push(wb, &n, 1);

uint32_t x = (uint32_t) len;

assert(x == len); // can't fit in 4 bytes

wb_push(wb, &x, 4);

}

wb_push(wb, str, len);

}

static void pack_one(lua_State *L, struct write_block *b, int index);

static int

wb_table_array(lua_State *L, struct write_block * wb, int index) {

int array_size = (int)lua_rawlen(L,index);

if (array_size >= EXTEND_NUMBER) {

uint8_t n = COMBINE_TYPE(TYPE_TABLE, EXTEND_NUMBER);

wb_push(wb, &n, 1);

wb_integer(wb, array_size);

} else {

uint8_t n = COMBINE_TYPE(TYPE_TABLE, array_size);

wb_push(wb, &n, 1);

}

int i;

for (i=1;i<=array_size;i++) {

lua_rawgeti(L,index,i);

pack_one(L, wb, -1);

lua_pop(L,1);

}

return array_size;

}

static void

wb_table_hash(lua_State *L, struct write_block * wb, int index, int array_size) {

lua_pushnil(L);

while (lua_next(L, index) != 0) {

if (lua_type(L,-2) == LUA_TNUMBER) {

if (lua_isinteger(L, -2)) {

lua_Integer x = lua_tointeger(L,-2);

if (x>0 && x<=array_size) {

lua_pop(L,1);

continue;

}

pack_one(L,wb,-2);

pack_one(L,wb,-1);

lua_pop(L, 1);

}

wb_nil(wb);

}

static void

wb_table_metapairs(lua_State *L, struct write_block *wb, int index) {

uint8_t n = COMBINE_TYPE(TYPE_TABLE, 0);

wb_push(wb, &n, 1);

lua_pushvalue(L, index);

lua_call(L, 1, 3);

for(;;) {

lua_pushvalue(L, -2);

lua_copy(L, -5, -3);

lua_call(L, 2, 2);

int type = lua_type(L, -2);

if (type == LUA_TNIL) {

lua_pop(L, 4);

break;

}

pack_one(L, wb, -2);

pack_one(L, wb, -1);

lua_pop(L, 1);

}

wb_nil(wb);

}

static inline void

mark_table(lua_State *L, struct write_block *b, int index) {

const void * obj = lua_topointer(L, index);

struct stack *s = &b->s;

int id = s->objectid++;

void *addr = wb_address(b);

if (id == MAX_REFERENCE) {

lua_createtable(L, 0, MAX_REFERENCE+1);

lua_replace(L, s->ref_index);

lua_createtable(L, MAX_REFERENCE+1, 0);

lua_replace(L, s->ref_index+1);

int i;

for (i=0;i<MAX_REFERENCE;i++) {

lua_pushinteger(L, i+1);

lua_rawsetp(L, s->ref_index, b->r[i].object);

if (b->r[i].address) {

lua_pushlightuserdata(L, (void *)b->r[i].address);

lua_rawseti(L, s->ref_index+1, i+1);

}

if (id < MAX_REFERENCE) {

b->r[id].object = obj;

b->r[id].address = addr;

} else {

++id;

lua_pushinteger(L, id);

lua_rawsetp(L, s->ref_index, obj);

lua_pushlightuserdata(L, addr);

lua_rawseti(L, s->ref_index + 1, id);

}

static void

wb_table(lua_State *L, struct write_block *wb, int index) {

luaL_checkstack(L, LUA_MINSTACK, NULL);

if (index < 0) {

index = lua_gettop(L) + index + 1;

}

mark_table(L, wb, index);

if (luaL_getmetafield(L, index, "__pairs") != LUA_TNIL) {

wb_table_metapairs(L, wb, index);

} else {

int array_size = wb_table_array(L, wb, index);

wb_table_hash(L, wb, index, array_size);

}

static int

ref_ancestor(lua_State *L, struct write_block *b, int index) {

struct stack *s = &b->s;

int n = s->depth;

if (n == 0 || n >= MAX_DEPTH)

return 0;

int i;

const void * obj = lua_topointer(L, index);

for (i=n-1;i>=0;i--) {

const void * ancestor = lua_topointer(L, s->ancestor[i]);

if (ancestor == obj) {

uint8_t n = COMBINE_TYPE(TYPE_REF, i);

wb_push(b, &n, 1);

return 1;

}

return 0;

}

static inline void

change_mark(uint8_t *tag) {

assert((*tag & 0x7) == TYPE_TABLE);

*tag = COMBINE_TYPE(TYPE_TABLE_MARK, *tag >> 3);

}

static inline int

lookup_ref(lua_State *L, struct write_block *b, const void *obj) {

if (b->s.objectid <= MAX_REFERENCE) {

int i;

for (i=0;i<b->s.objectid;i++) {

if (obj == b->r[i].object) {

if (b->r[i].address) {

change_mark(b->r[i].address);

b->r[i].address = NULL;

}

return i+1;

}

return 0;

} else {

if (lua_rawgetp(L, b->s.ref_index, obj) != LUA_TNUMBER) {

lua_pop(L, 1);

return 0;

}

int id = lua_tointeger(L, -1);

lua_pop(L, 1);

if (lua_rawgeti(L, b->s.ref_index + 1, id) == LUA_TLIGHTUSERDATA) {

uint8_t * tag = (uint8_t *)lua_touserdata(L, -1);

lua_pop(L, 1);

change_mark(tag);

lua_pushnil(L);

lua_rawseti(L, b->s.ref_index + 1, id);

} else {

lua_pop(L, 1);

}

return id;

}

static int

ref_object(lua_State *L, struct write_block *b, int index) {

const void * obj = lua_topointer(L, index);

int id = lookup_ref(L, b, obj);

if (id > 0) {

uint8_t n = COMBINE_TYPE(TYPE_REF, EXTEND_NUMBER);

wb_push(b, &n, 1);

wb_integer(b, id);

return 1;

} else {

return 0;

}

static void

pack_one(lua_State *L, struct write_block *b, int index) {

struct stack *s = &b->s;

int type = lua_type(L,index);

switch(type) {

case LUA_TNIL:

wb_nil(b);

break;

case LUA_TNUMBER: {

if (lua_isinteger(L, index)) {

lua_Integer x = lua_tointeger(L,index);

wb_integer(b, x);

} else {

lua_Number n = lua_tonumber(L,index);

wb_real(b,n);

}

break;

}

case LUA_TBOOLEAN:

wb_boolean(b, lua_toboolean(L,index));

break;

case LUA_TSTRING: {

size_t sz = 0;

const char *str = lua_tolstring(L,index,&sz);

wb_string(b, str, sz);

break;

}

case LUA_TLIGHTUSERDATA:

wb_pointer(b, lua_touserdata(L,index), TYPE_USERDATA_POINTER);

break;

case LUA_TFUNCTION: {

lua_CFunction func = lua_tocfunction(L,index);

if (func == NULL || lua_getupvalue(L, index, 1) != NULL) {

luaL_error(L, "Only light C function can be serialized");

}

wb_pointer(b, (void *)func, TYPE_USERDATA_CFUNCTION);

break; }

case LUA_TTABLE: {

if (index < 0) {

index = lua_gettop(L) + index + 1;

}

if (ref_ancestor(L, b, index))

break;

if (ref_object(L, b, index))

break;

if (s->depth < MAX_DEPTH)

s->ancestor[s->depth] = index;

++s->depth;

wb_table(L, b, index);

--s->depth;

break;

}

default:

wb_free(b);

luaL_error(L, "Unsupport type %s to serialize", lua_typename(L, type));

}

static void

pack_from(lua_State *L, struct write_block *b, int from) {

int top = lua_gettop(L);

int n = top - from;

int i;

lua_pushnil(L); // slot for table ref lookup { pointer -> id }

lua_pushnil(L); // slot for table refs array { address, ... }

b->s.ref_index = top + 1;

for (i=1;i<=n;i++) {

pack_one(L, b , from + i);

}

static inline void

invalid_stream_line(lua_State *L, struct read_block *rb, int line) {

int len = rb->len;

luaL_error(L, "Invalid serialize stream %d (line:%d)", len, line);

}

#define invalid_stream(L,rb) invalid_stream_line(L,rb,__LINE__)

static lua_Integer

get_integer(lua_State *L, struct read_block *rb, int cookie) {

switch (cookie) {

case TYPE_NUMBER_ZERO:

return 0;

case TYPE_NUMBER_BYTE: {

uint8_t n;

const uint8_t * pn = (const uint8_t *)rb_read(rb,sizeof(n));

if (pn == NULL)

invalid_stream(L,rb);

n = *pn;

return n;

}

case TYPE_NUMBER_WORD: {

uint16_t n;

const void * pn = rb_read(rb,sizeof(n));

if (pn == NULL)

invalid_stream(L,rb);

memcpy(&n, pn, sizeof(n));

return n;

}

case TYPE_NUMBER_DWORD: {

int32_t n;

const void * pn = rb_read(rb,sizeof(n));

if (pn == NULL)

invalid_stream(L,rb);

memcpy(&n, pn, sizeof(n));

return n;

}

case TYPE_NUMBER_QWORD: {

int64_t n;

const void * pn = rb_read(rb,sizeof(n));

if (pn == NULL)

invalid_stream(L,rb);

memcpy(&n, pn, sizeof(n));

return n;

}

default:

invalid_stream(L,rb);

return 0;

}

static double

get_real(lua_State *L, struct read_block *rb) {

double n;

const void * pn = rb_read(rb,sizeof(n));

if (pn == NULL)

invalid_stream(L,rb);

memcpy(&n, pn, sizeof(n));

return n;

}

static void *

get_pointer(lua_State *L, struct read_block *rb) {

void * userdata = 0;

const void * v = rb_read(rb,sizeof(userdata));

if (v == NULL) {

invalid_stream(L,rb);

}

memcpy(&userdata, v, sizeof(userdata));

return userdata;

}

static void

get_buffer(lua_State *L, struct read_block *rb, int len) {

const char * p = (const char *)rb_read(rb,len);

if (p == NULL) {

invalid_stream(L,rb);

}

lua_pushlstring(L,p,len);

}

static void unpack_one(lua_State *L, struct read_block *rb);

static int

get_extend_integer(lua_State *L, struct read_block *rb) {

uint8_t type;

const uint8_t *t = rb_read(rb, sizeof(type));

if (t==NULL) {

invalid_stream(L,rb);

}

type = *t;

int cookie = type >> 3;

if ((type & 7) != TYPE_NUMBER || cookie == TYPE_NUMBER_REAL) {

invalid_stream(L,rb);

}

return (int)get_integer(L,rb,cookie);

}

static void

unpack_table(lua_State *L, struct read_block *rb, int array_size, int type) {

if (array_size == EXTEND_NUMBER) {

array_size = get_extend_integer(L, rb);

}

struct stack *s = &rb->s;

int id = ++s->objectid;

luaL_checkstack(L,LUA_MINSTACK,NULL);

lua_createtable(L,array_size,0);

if (type == TYPE_TABLE_MARK) {

lua_pushvalue(L, -1);

if (lua_type(L, s->ref_index) == LUA_TNIL) {

lua_newtable(L);

lua_replace(L, s->ref_index);

}

lua_rawseti(L, s->ref_index, id);

}

if (s->depth < MAX_DEPTH)

s->ancestor[s->depth] = lua_gettop(L);

++s->depth;

int i;

for (i=1;i<=array_size;i++) {

unpack_one(L,rb);

lua_rawseti(L,-2,i);

}

--s->depth;

for (;;) {

unpack_one(L,rb);

if (lua_isnil(L,-1)) {

lua_pop(L,1);

return;

}

++s->depth;

unpack_one(L,rb);

--s->depth;

lua_rawset(L,-3);

}

static void

unpack_ref(lua_State *L, struct read_block *rb, int ref) {

struct stack *s = &rb->s;

if (ref == EXTEND_NUMBER) {

int id = get_extend_integer(L, rb);

if (lua_type(L, s->ref_index) != LUA_TTABLE || lua_rawgeti(L, s->ref_index, id) != LUA_TTABLE) {

luaL_error(L, "Invalid ref object id %d", id);

}

} else {

if (ref >= s->depth)

luaL_error(L, "Invalid ref object %d/%d", ref, s->depth);

lua_pushvalue(L, s->ancestor[ref]);

}

static void

push_value(lua_State *L, struct read_block *rb, int type, int cookie) {

switch(type) {

case TYPE_BOOLEAN:

switch (cookie) {

case TYPE_BOOLEAN_NIL:

lua_pushnil(L);

break;

case TYPE_BOOLEAN_FALSE:

lua_pushboolean(L,0);

break;

case TYPE_BOOLEAN_TRUE:

lua_pushboolean(L,1);

break;

default:

luaL_error(L, "Invalid boolean subtype %d", cookie);

}

break;

case TYPE_NUMBER:

if (cookie == TYPE_NUMBER_REAL) {

lua_pushnumber(L,get_real(L,rb));

} else {

lua_pushinteger(L, get_integer(L, rb, cookie));

}

break;

case TYPE_USERDATA:

if (cookie == TYPE_USERDATA_POINTER)

lua_pushlightuserdata(L,get_pointer(L,rb));

else {

if (cookie != TYPE_USERDATA_CFUNCTION)

luaL_error(L, "Invalid userdata");

lua_pushcfunction(L, (lua_CFunction)get_pointer(L, rb));

}

break;

case TYPE_SHORT_STRING:

get_buffer(L,rb,cookie);

break;

case TYPE_LONG_STRING: {

if (cookie == 2) {

const void *plen = rb_read(rb, 2);

if (plen == NULL) {

invalid_stream(L,rb);

}

uint16_t n;

memcpy(&n, plen, sizeof(n));

get_buffer(L,rb,n);

} else {

if (cookie != 4) {

invalid_stream(L,rb);

}

const void *plen = rb_read(rb, 4);

if (plen == NULL) {

invalid_stream(L,rb);

}

uint32_t n;

memcpy(&n, plen, sizeof(n));

get_buffer(L,rb,n);

}

break;

}

case TYPE_TABLE:

case TYPE_TABLE_MARK:

unpack_table(L,rb,cookie,type);

break;

case TYPE_REF:

unpack_ref(L,rb,cookie);

break;

default:

invalid_stream(L,rb);

break;

}

static void

unpack_one(lua_State *L, struct read_block *rb) {

uint8_t type;

const uint8_t *t = rb_read(rb, sizeof(type));

if (t==NULL) {

invalid_stream(L, rb);

}

type = *t;

push_value(L, rb, type & 0x7, type>>3);

}

static void *

seri(struct block *b, int len) {

if (len < 0)

return NULL;

uint8_t * buffer = malloc(len + 4);

memcpy(buffer, &len, 4); // write length

uint8_t * ptr = buffer + 4;

while(len>0) {

if (len >= BLOCK_SIZE) {

len -= BLOCK_SIZE;

if (len < 0) {

free(buffer);

return NULL;

}

memcpy(ptr, b->buffer, BLOCK_SIZE);

ptr += BLOCK_SIZE;

b = b->next;

} else {

memcpy(ptr, b->buffer, len);

break;

}

return buffer;

}

int

seri_unpack(lua_State *L, void *buffer) {

int top = lua_gettop(L);

int len = 0;

memcpy(&len, buffer, 4); // get length

struct read_block rb;

rball_init(&rb, (char *)buffer + 4, len);

lua_pushnil(L); // slot for ref table

rb.s.ref_index = top + 1;

int i;

for (i=0;;i++) {

if (i%8==0) {

luaL_checkstack(L,LUA_MINSTACK,NULL);

}

uint8_t type = 0;

const uint8_t *t = rb_read(&rb, sizeof(type));

if (t==NULL)

break;

type = *t;

push_value(L, &rb, type & 0x7, type>>3);

}

return lua_gettop(L) - 1 - top;

}

static int

seri_unpack_(lua_State *L) {

void *buffer = lua_touserdata(L, 1);

lua_settop(L, 0);

return seri_unpack(L, buffer);

}

int

seri_unpackptr(lua_State *L, void *buffer) {

int top = lua_gettop(L);

lua_pushcfunction(L, seri_unpack_);

lua_pushlightuserdata(L, buffer);

int err = lua_pcall(L, 1, LUA_MULTRET, 0);

free(buffer);

if (err != LUA_OK) {

lua_error(L);

}

return lua_gettop(L) - top;

}

int

seri_unpackstr(lua_State *L) {

const char * buffer = luaL_checkstring(L, 1);

lua_settop(L, 1);

lua_pushcfunction(L, seri_unpack_);

lua_pushlightuserdata(L, (void *)buffer);

if (lua_pcall(L, 1, LUA_MULTRET, 0) != LUA_OK) {

lua_error(L);

}

return lua_gettop(L) - 1;

}

void *

seri_pack(lua_State *L, int from, int *sz) {

struct block temp;

temp.next = NULL;

struct write_block wb;

wb_init(&wb, &temp);

pack_from(L,&wb,from);

assert(wb.head == &temp);

void * buffer = seri(&temp, wb.len);

if (sz) {

*sz = wb.len + 4;

}

wb_free(&wb);

return buffer;

}

void *

seri_packstring(const char * str, size_t sz, void *p, size_t *output) {

struct block temp;

temp.next = NULL;

struct write_block wb;

wb_init(&wb, &temp);

if (sz == 0) {

sz = strlen(str);

}

wb_string(&wb, str, sz);

if (p) {

wb_pointer(&wb, p, TYPE_USERDATA_POINTER);

}

assert(wb.head == &temp);

void * buffer = seri(&temp, wb.len);

if (output) {

*output = wb.len + 4;

}

wb_free(&wb);

return buffer;

}

int

luaseri_unpack(lua_State *L) {

if (lua_isnoneornil(L, 1)) {

return 0;

}

lua_settop(L, 1);

return seri_unpack_(L);

}

int

luaseri_unpack_remove(lua_State *L) {

if (lua_isnoneornil(L, 1)) {

return 0;

}

return seri_unpackptr(L, lua_touserdata(L, 1));

}

int

luaseri_pack(lua_State *L) {

int sz = 0;

void * buffer = seri_pack(L, 0, &sz);

if (buffer == NULL) {

return luaL_error(L, "block is too large");

}

lua_pushlightuserdata(L, buffer);

lua_pushinteger(L, sz);

return 2;

}

int

luaseri_remove(lua_State *L) {

if (lua_isnoneornil(L, 1))

return 0;

luaL_checktype(L, 1, LUA_TLIGHTUSERDATA);

void * data = lua_touserdata(L, 1);

size_t sz = luaL_checkinteger(L, 2);

(void)sz;

free(data);

return 0;

}

#ifdef TEST_SERI

LUAMOD_API int

luaopen_seri(lua_State *L) {

luaL_checkversion(L);

luaL_Reg l[] = {

{ "pack", luaseri_pack },

{ "unpack", luaseri_unpack },

{ "unpack_remove", luaseri_unpack_remove },

{ NULL, NULL },

};

luaL_newlib(L, l);

return 1;

}

#endif

ltask/src/lua-seri.c at master · cloudwu/ltask · GitHub

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