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pb.c
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pb.c
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#define PB_STATIC_API
#include "pb.h"
PB_NS_BEGIN
#define LUA_LIB
#include <lua.h>
#include <lauxlib.h>
#include <stdio.h>
#include <errno.h>
/* Lua util routines */
#define PB_STATE "pb.State"
#define PB_BUFFER "pb.Buffer"
#define PB_SLICE "pb.Slice"
#define check_buffer(L,idx) ((pb_Buffer*)luaL_checkudata(L,idx,PB_BUFFER))
#define test_buffer(L,idx) ((pb_Buffer*)luaL_testudata(L,idx,PB_BUFFER))
#define check_slice(L,idx) ((lpb_SliceEx*)luaL_checkudata(L,idx,PB_SLICE))
#define test_slice(L,idx) ((lpb_SliceEx*)luaL_testudata(L,idx,PB_SLICE))
#define return_self(L) { lua_settop(L, 1); return 1; }
#if LUA_VERSION_NUM < 502
#include <assert.h>
# define LUA_OK 0
# define lua_rawlen lua_objlen
# define luaL_setfuncs(L,l,n) (assert(n==0), luaL_register(L,NULL,l))
# define luaL_setmetatable(L, name) \
(luaL_getmetatable((L), (name)), lua_setmetatable(L, -2))
static int relindex(int idx, int offset)
{ return idx < 0 && idx > LUA_REGISTRYINDEX ? idx - offset : idx; }
static void lua_rawgetp(lua_State *L, int idx, const void *p) {
lua_pushlightuserdata(L, (void*)p);
lua_rawget(L, relindex(idx, 1));
}
static void lua_rawsetp(lua_State *L, int idx, const void *p) {
lua_pushlightuserdata(L, (void*)p);
lua_insert(L, -2);
lua_rawset(L, relindex(idx, 1));
}
#ifndef luaL_newlib /* not LuaJIT 2.1 */
#define luaL_newlib(L,l) (lua_newtable(L), luaL_register(L,NULL,l))
static lua_Integer lua_tointegerx(lua_State *L, int idx, int *isint) {
lua_Integer i = lua_tointeger(L, idx);
if (isint) *isint = (i != 0 || lua_type(L, idx) == LUA_TNUMBER);
return i;
}
static lua_Number lua_tonumberx(lua_State *L, int idx, int *isnum) {
lua_Number i = lua_tonumber(L, idx);
if (isnum) *isnum = (i != 0 || lua_type(L, idx) == LUA_TNUMBER);
return i;
}
static void *luaL_testudata(lua_State *L, int idx, const char *type) {
void *p = lua_touserdata(L, idx);
if (p != NULL && lua_getmetatable(L, idx)) {
lua_getfield(L, LUA_REGISTRYINDEX, type);
if (!lua_rawequal(L, -2, -1))
p = NULL;
lua_pop(L, 2);
return p;
}
return NULL;
}
#endif
#ifdef LUAI_BITSINT /* not LuaJIT */
#include <errno.h>
static int luaL_fileresult(lua_State *L, int stat, const char *fname) {
int en = errno;
if (stat) { lua_pushboolean(L, 1); return 1; }
lua_pushnil(L);
lua_pushfstring(L, "%s: %s", fname, strerror(en));
/*if (fname) lua_pushfstring(L, "%s: %s", fname, strerror(en));
else lua_pushstring(L, strerror(en));*//* NOT USED */
lua_pushinteger(L, en);
return 3;
}
#endif /* not LuaJIT */
#endif
#if LUA_VERSION_NUM >= 503
# define lua53_getfield lua_getfield
# define lua53_rawgeti lua_rawgeti
# define lua53_rawgetp lua_rawgetp
#else /* not Lua 5.3 */
static int lua53_getfield(lua_State *L, int idx, const char *field)
{ lua_getfield(L, idx, field); return lua_type(L, -1); }
static int lua53_rawgeti(lua_State *L, int idx, lua_Integer i)
{ lua_rawgeti(L, idx, i); return lua_type(L, -1); }
static int lua53_rawgetp(lua_State *L, int idx, const void *p)
{ lua_rawgetp(L, idx, p); return lua_type(L, -1); }
#endif
/* protobuf global state */
#define default_state(L) ((pb_State*)default_lstate(L))
static const char state_name[] = PB_STATE;
enum lpb_Int64Mode { LPB_NUMBER, LPB_STRING, LPB_HEXSTRING };
enum lpb_DefMode { LPB_DEFDEF, LPB_COPYDEF, LPB_METADEF, LPB_NODEF };
typedef struct lpb_State {
pb_State base;
pb_Buffer buffer;
int defs_index;
int hooks_index;
unsigned use_hooks : 1; /* lpb_Int64Mode */
unsigned enum_as_value : 1;
unsigned default_mode : 2; /* lpb_DefMode */
unsigned int64_mode : 2; /* lpb_Int64Mode */
} lpb_State;
static int lpb_reftable(lua_State *L, int ref) {
if (ref != LUA_NOREF) {
lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
return ref;
} else {
lua_newtable(L);
lua_pushvalue(L, -1);
return luaL_ref(L, LUA_REGISTRYINDEX);
}
}
static void lpb_pushdeftable(lua_State *L, lpb_State *LS)
{ LS->defs_index = lpb_reftable(L, LS->defs_index); }
static void lpb_pushhooktable(lua_State *L, lpb_State *LS)
{ LS->hooks_index = lpb_reftable(L, LS->hooks_index); }
static int Lpb_delete(lua_State *L) {
lpb_State *LS = (lpb_State*)luaL_testudata(L, 1, PB_STATE);
if (LS != NULL) {
pb_free(&LS->base);
pb_resetbuffer(&LS->buffer);
luaL_unref(L, LUA_REGISTRYINDEX, LS->defs_index);
luaL_unref(L, LUA_REGISTRYINDEX, LS->hooks_index);
}
return 0;
}
static lpb_State *default_lstate(lua_State *L) {
lpb_State *LS;
if (lua53_rawgetp(L, LUA_REGISTRYINDEX, state_name) == LUA_TUSERDATA) {
LS = (lpb_State*)lua_touserdata(L, -1);
lua_pop(L, 1);
} else {
lua_pop(L, 1);
LS = (lpb_State*)lua_newuserdata(L, sizeof(lpb_State));
memset(LS, 0, sizeof(lpb_State));
LS->defs_index = LUA_NOREF;
LS->hooks_index = LUA_NOREF;
pb_init(&LS->base);
pb_initbuffer(&LS->buffer);
luaL_setmetatable(L, PB_STATE);
lua_rawsetp(L, LUA_REGISTRYINDEX, state_name);
}
return LS;
}
static int Lpb_state(lua_State *L) {
int top = lua_gettop(L);
default_lstate(L);
lua_rawgetp(L, LUA_REGISTRYINDEX, state_name);
if (top != 0) {
if (lua_isnil(L, 1))
lua_pushnil(L);
else {
luaL_checkudata(L, 1, PB_STATE);
lua_pushvalue(L, 1);
}
lua_rawsetp(L, LUA_REGISTRYINDEX, state_name);
}
return 1;
}
/* protobuf util routines */
typedef struct lpb_SliceEx {
pb_Slice base;
const char *head;
} lpb_SliceEx;
static int lpb_offset(lpb_SliceEx *s) { return (int)(s->base.p-s->head) + 1; }
static lpb_SliceEx lpb_initext(pb_Slice s)
{ lpb_SliceEx ext; ext.base = s, ext.head = s.p; return ext; }
static void lpb_addlength(lua_State *L, pb_Buffer *b, size_t len)
{ if (pb_addlength(b, len) == 0) luaL_error(L, "encode bytes fail"); }
static int typeerror(lua_State *L, int idx, const char *type) {
lua_pushfstring(L, "%s expected, got %s", type, luaL_typename(L, idx));
return luaL_argerror(L, idx, lua_tostring(L, -1));
}
static lua_Integer posrelat(lua_Integer pos, size_t len) {
if (pos >= 0) return pos;
else if (0u - (size_t)pos > len) return 0;
else return (lua_Integer)len + pos + 1;
}
static lua_Integer rangerelat(lua_State *L, int idx, lua_Integer r[2], size_t len) {
r[0] = posrelat(luaL_optinteger(L, idx, 1), len);
r[1] = posrelat(luaL_optinteger(L, idx+1, len), len);
if (r[0] < 1) r[0] = 1;
if (r[1] > (lua_Integer)len) r[1] = len;
return r[0] <= r[1] ? r[1] - r[0] + 1 : 0;
}
static int argcheck(lua_State *L, int cond, int idx, const char *fmt, ...) {
if (!cond) {
va_list l;
va_start(l, fmt);
lua_pushvfstring(L, fmt, l);
va_end(l);
return luaL_argerror(L, idx, lua_tostring(L, -1));
}
return 1;
}
static pb_Slice lpb_toslice(lua_State *L, int idx) {
int type = lua_type(L, idx);
pb_Slice ret = { NULL, NULL };
if (type == LUA_TSTRING) {
size_t len;
const char *s = lua_tolstring(L, idx, &len);
ret = pb_lslice(s, len);
} else if (type == LUA_TUSERDATA) {
pb_Buffer *buffer;
lpb_SliceEx *s;
if ((buffer = test_buffer(L, idx)) != NULL)
ret = pb_result(buffer);
else if ((s = test_slice(L, idx)) != NULL)
ret = s->base;
}
return ret;
}
static pb_Slice lpb_checkslice(lua_State *L, int idx) {
pb_Slice ret = lpb_toslice(L, idx);
if (ret.p == NULL) typeerror(L, idx, "string/buffer/slice");
return ret;
}
static void lpb_readbytes(lua_State *L, lpb_SliceEx *s, lpb_SliceEx *pv) {
uint64_t len = 0;
if (pb_readvarint64(&s->base, &len) == 0 || len > PB_MAX_SIZET)
luaL_error(L, "invalid bytes length: %d (at offset %d)",
(int)len, lpb_offset(s));
if (pb_readslice(&s->base, (size_t)len, &pv->base) == 0 && len != 0)
luaL_error(L, "un-finished bytes (len %d at offset %d)",
(int)len, lpb_offset(s));
pv->head = s->head;
}
static int lpb_hexchar(char ch) {
switch (ch) {
case '0': return 0;
case '1': return 1; case '2': return 2; case '3': return 3;
case '4': return 4; case '5': return 5; case '6': return 6;
case '7': return 7; case '8': return 8; case '9': return 9;
case 'a': case 'A': return 10; case 'b': case 'B': return 11;
case 'c': case 'C': return 12; case 'd': case 'D': return 13;
case 'e': case 'E': return 14; case 'f': case 'F': return 15;
}
return -1;
}
static uint64_t lpb_tointegerx(lua_State *L, int idx, int *isint) {
int neg = 0;
const char *s, *os;
#if LUA_VERSION_NUM >= 503
uint64_t v = (uint64_t)lua_tointegerx(L, idx, isint);
if (*isint) return v;
#else
uint64_t v = 0;
lua_Number nv = lua_tonumberx(L, idx, isint);
if (*isint) {
if (nv < (lua_Number)INT64_MIN || nv > (lua_Number)INT64_MAX)
luaL_error(L, "number has no integer representation");
return (uint64_t)(int64_t)nv;
}
#endif
if ((os = s = lua_tostring(L, idx)) == NULL) return 0;
while (*s == '#' || *s == '+' || *s == '-')
neg = (*s == '-') ^ neg, ++s;
if (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')) {
for (s += 2; *s != '\0'; ++s) {
int n = lpb_hexchar(*s);
if (n < 0) break;
v = v << 4 | n;
}
} else {
for (; *s != '\0'; ++s) {
int n = lpb_hexchar(*s);
if (n < 0 || n > 10) break;
v = v * 10 + n;
}
}
if (*s != '\0') luaL_error(L, "integer format error: '%s'", os);
*isint = 1;
return neg ? ~v + 1 : v;
}
static uint64_t lpb_checkinteger(lua_State *L, int idx) {
int isint;
uint64_t v = lpb_tointegerx(L, idx, &isint);
if (!isint) typeerror(L, idx, "number/string");
return v;
}
static void lpb_pushinteger(lua_State *L, int64_t n, int mode) {
if (mode != LPB_NUMBER && (n < INT_MIN || n > INT_MAX)) {
char buff[32], *p = buff + sizeof(buff) - 1;
int neg = n < 0;
uint64_t un = neg ? ~(uint64_t)n + 1 : (uint64_t)n;
if (mode == LPB_STRING) {
for (*p = '\0'; un > 0; un /= 10)
*--p = "0123456789"[un % 10];
} else if (mode == LPB_HEXSTRING) {
for (*p = '\0'; un > 0; un >>= 4)
*--p = "0123456789ABCDEF"[un & 0xF];
*--p = 'x', *--p = '0';
}
if (neg) *--p = '-';
*--p = '#';
lua_pushstring(L, p);
} else if (LUA_VERSION_NUM >= 503 && sizeof(lua_Integer) >= 8)
lua_pushinteger(L, (lua_Integer)n);
else
lua_pushnumber(L, (lua_Number)n);
}
typedef union lpb_Value {
lpb_SliceEx s[1];
uint32_t u32;
uint64_t u64;
lua_Integer lint;
lua_Number lnum;
} lpb_Value;
static int lpb_addtype(lua_State *L, pb_Buffer *b, int idx, int type, size_t *plen) {
int ret = 0, expected = LUA_TNUMBER;
lpb_Value v;
size_t len = 0;
switch (type) {
case PB_Tbool:
len = pb_addvarint32(b, ret = lua_toboolean(L, idx));
if (ret) len = 0;
ret = 1;
break;
case PB_Tdouble:
v.lnum = lua_tonumberx(L, idx, &ret);
if (ret) len = pb_addfixed64(b, pb_encode_double((double)v.lnum));
if (v.lnum != 0.0) len = 0;
break;
case PB_Tfloat:
v.lnum = lua_tonumberx(L, idx, &ret);
if (ret) len = pb_addfixed32(b, pb_encode_float((float)v.lnum));
if (v.lnum != 0.0) len = 0;
break;
case PB_Tfixed32:
v.u64 = lpb_tointegerx(L, idx, &ret);
if (ret) len = pb_addfixed32(b, v.u32);
if (v.u64 != 0) len = 0;
break;
case PB_Tsfixed32:
v.u64 = lpb_tointegerx(L, idx, &ret);
if (ret) len = pb_addfixed32(b, v.u32);
if (v.u64 != 0) len = 0;
break;
case PB_Tint32:
v.u64 = lpb_tointegerx(L, idx, &ret);
if (ret) len = pb_addvarint64(b, pb_expandsig((uint32_t)v.u64));
if (v.u64 != 0) len = 0;
break;
case PB_Tuint32:
v.u64 = lpb_tointegerx(L, idx, &ret);
if (ret) len = pb_addvarint32(b, v.u32);
if (v.u64 != 0) len = 0;
break;
case PB_Tsint32:
v.u64 = lpb_tointegerx(L, idx, &ret);
if (ret) len = pb_addvarint32(b, pb_encode_sint32(v.u32));
if (v.u64 != 0) len = 0;
break;
case PB_Tfixed64:
v.u64 = lpb_tointegerx(L, idx, &ret);
if (ret) len = pb_addfixed64(b, v.u64);
if (v.u64 != 0) len = 0;
break;
case PB_Tsfixed64:
v.u64 = lpb_tointegerx(L, idx, &ret);
if (ret) len = pb_addfixed64(b, v.u64);
if (v.u64 != 0) len = 0;
break;
case PB_Tint64: case PB_Tuint64:
v.u64 = lpb_tointegerx(L, idx, &ret);
if (ret) len = pb_addvarint64(b, v.u64);
if (v.u64 != 0) len = 0;
break;
case PB_Tsint64:
v.u64 = lpb_tointegerx(L, idx, &ret);
if (ret) len = pb_addvarint64(b, pb_encode_sint64(v.u64));
if (v.u64 != 0) len = 0;
break;
case PB_Tbytes: case PB_Tstring:
v.s->base = lpb_toslice(L, idx);
if ((ret = (v.s->base.p != NULL))) len = pb_addbytes(b, v.s->base);
if (pb_len(v.s->base) != 0) len = 0;
expected = LUA_TSTRING;
break;
default:
lua_pushfstring(L, "unknown type %s", pb_typename(type, "<unknown>"));
if (idx > 0) argcheck(L, 0, idx, lua_tostring(L, -1));
lua_error(L);
}
if (plen) *plen = len;
return ret ? 0 : expected;
}
static void lpb_readtype(lua_State *L, lpb_State *LS, int type, lpb_SliceEx *s) {
lpb_Value v;
switch (type) {
#define pushinteger(n) lpb_pushinteger((L), (n), LS->int64_mode)
case PB_Tbool: case PB_Tenum:
case PB_Tint32: case PB_Tuint32: case PB_Tsint32:
case PB_Tint64: case PB_Tuint64: case PB_Tsint64:
if (pb_readvarint64(&s->base, &v.u64) == 0)
luaL_error(L, "invalid varint value at offset %d", lpb_offset(s));
switch (type) {
case PB_Tbool: lua_pushboolean(L, v.u64 != 0); break;
/*case PB_Tenum: pushinteger(v.u64); break; [> NOT REACHED <]*/
case PB_Tint32: pushinteger((int32_t)v.u64); break;
case PB_Tuint32: pushinteger((uint32_t)v.u64); break;
case PB_Tsint32: pushinteger(pb_decode_sint32((uint32_t)v.u64)); break;
case PB_Tint64: pushinteger((int64_t)v.u64); break;
case PB_Tuint64: pushinteger((uint64_t)v.u64); break;
case PB_Tsint64: pushinteger(pb_decode_sint64(v.u64)); break;
}
break;
case PB_Tfloat:
case PB_Tfixed32:
case PB_Tsfixed32:
if (pb_readfixed32(&s->base, &v.u32) == 0)
luaL_error(L, "invalid fixed32 value at offset %d", lpb_offset(s));
switch (type) {
case PB_Tfloat: lua_pushnumber(L, pb_decode_float(v.u32)); break;
case PB_Tfixed32: pushinteger(v.u32); break;
case PB_Tsfixed32: pushinteger((int32_t)v.u32); break;
}
break;
case PB_Tdouble:
case PB_Tfixed64:
case PB_Tsfixed64:
if (pb_readfixed64(&s->base, &v.u64) == 0)
luaL_error(L, "invalid fixed64 value at offset %d", lpb_offset(s));
switch (type) {
case PB_Tdouble: lua_pushnumber(L, pb_decode_double(v.u64)); break;
case PB_Tfixed64: pushinteger(v.u64); break;
case PB_Tsfixed64: pushinteger((int64_t)v.u64); break;
}
break;
case PB_Tbytes:
case PB_Tstring:
case PB_Tmessage:
lpb_readbytes(L, s, v.s);
lua_pushlstring(L, v.s->base.p, pb_len(v.s->base));
break;
default:
luaL_error(L, "unknown type %s (%d)", pb_typename(type, NULL), type);
}
}
/* io routines */
#ifdef _WIN32
# include <io.h>
# include <fcntl.h>
#else
# define setmode(a,b) ((void)0)
#endif
static int io_read(lua_State *L) {
FILE *fp = (FILE*)lua_touserdata(L, 1);
size_t nr;
luaL_Buffer b;
luaL_buffinit(L, &b);
do { /* read file in chunks of LUAL_BUFFERSIZE bytes */
char *p = luaL_prepbuffer(&b);
nr = fread(p, sizeof(char), LUAL_BUFFERSIZE, fp);
luaL_addsize(&b, nr);
} while (nr == LUAL_BUFFERSIZE);
luaL_pushresult(&b); /* close buffer */
return 1;
}
static int io_write(lua_State *L, FILE *f, int idx) {
int nargs = lua_gettop(L) - idx + 1;
int status = 1;
for (; nargs--; idx++) {
pb_Slice s = lpb_checkslice(L, idx);
size_t l = pb_len(s);
status = status && (fwrite(s.p, sizeof(char), l, f) == l);
}
return status ? 1 : luaL_fileresult(L, 0, NULL);
}
static int Lio_read(lua_State *L) {
const char *fname = luaL_optstring(L, 1, NULL);
FILE *fp = stdin;
int ret;
if (fname == NULL)
(void)setmode(fileno(stdin), O_BINARY);
else if ((fp = fopen(fname, "rb")) == NULL)
return luaL_fileresult(L, 0, fname);
lua_pushcfunction(L, io_read);
lua_pushlightuserdata(L, fp);
ret = lua_pcall(L, 1, 1, 0);
if (fp != stdin) fclose(fp);
else (void)setmode(fileno(stdin), O_TEXT);
if (ret != LUA_OK) { lua_pushnil(L); lua_insert(L, -2); return 2; }
return 1;
}
static int Lio_write(lua_State *L) {
int res;
(void)setmode(fileno(stdout), O_BINARY);
res = io_write(L, stdout, 1);
fflush(stdout);
(void)setmode(fileno(stdout), O_TEXT);
return res;
}
static int Lio_dump(lua_State *L) {
int res;
const char *fname = luaL_checkstring(L, 1);
FILE *fp = fopen(fname, "wb");
if (fp == NULL) return luaL_fileresult(L, 0, fname);
res = io_write(L, fp, 2);
fclose(fp);
return res;
}
LUALIB_API int luaopen_pb_io(lua_State *L) {
luaL_Reg libs[] = {
#define ENTRY(name) { #name, Lio_##name }
ENTRY(read),
ENTRY(write),
ENTRY(dump),
#undef ENTRY
{ NULL, NULL }
};
luaL_newlib(L, libs);
return 1;
}
/* protobuf integer conversion */
static int Lconv_encode_int32(lua_State *L) {
unsigned mode = default_lstate(L)->int64_mode;
uint64_t v = pb_expandsig((int32_t)lpb_checkinteger(L, 1));
lpb_pushinteger(L, v, mode);
return 1;
}
static int Lconv_encode_uint32(lua_State *L) {
unsigned mode = default_lstate(L)->int64_mode;
lpb_pushinteger(L, (uint32_t)lpb_checkinteger(L, 1), mode);
return 1;
}
static int Lconv_encode_sint32(lua_State *L) {
unsigned mode = default_lstate(L)->int64_mode;
lpb_pushinteger(L, pb_encode_sint32((int32_t)lpb_checkinteger(L, 1)), mode);
return 1;
}
static int Lconv_decode_sint32(lua_State *L) {
unsigned mode = default_lstate(L)->int64_mode;
lpb_pushinteger(L, pb_decode_sint32((uint32_t)lpb_checkinteger(L, 1)), mode);
return 1;
}
static int Lconv_encode_sint64(lua_State *L) {
unsigned mode = default_lstate(L)->int64_mode;
lpb_pushinteger(L, pb_encode_sint64(lpb_checkinteger(L, 1)), mode);
return 1;
}
static int Lconv_decode_sint64(lua_State *L) {
unsigned mode = default_lstate(L)->int64_mode;
lpb_pushinteger(L, pb_decode_sint64(lpb_checkinteger(L, 1)), mode);
return 1;
}
static int Lconv_encode_float(lua_State *L) {
unsigned mode = default_lstate(L)->int64_mode;
lpb_pushinteger(L, pb_encode_float((float)luaL_checknumber(L, 1)), mode);
return 1;
}
static int Lconv_decode_float(lua_State *L) {
lua_pushnumber(L, pb_decode_float((uint32_t)lpb_checkinteger(L, 1)));
return 1;
}
static int Lconv_encode_double(lua_State *L) {
unsigned mode = default_lstate(L)->int64_mode;
lpb_pushinteger(L, pb_encode_double(luaL_checknumber(L, 1)), mode);
return 1;
}
static int Lconv_decode_double(lua_State *L) {
lua_pushnumber(L, pb_decode_double(lpb_checkinteger(L, 1)));
return 1;
}
LUALIB_API int luaopen_pb_conv(lua_State *L) {
luaL_Reg libs[] = {
{ "decode_uint32", Lconv_encode_uint32 },
{ "decode_int32", Lconv_encode_int32 },
#define ENTRY(name) { #name, Lconv_##name }
ENTRY(encode_int32),
ENTRY(encode_uint32),
ENTRY(encode_sint32),
ENTRY(encode_sint64),
ENTRY(decode_sint32),
ENTRY(decode_sint64),
ENTRY(decode_float),
ENTRY(decode_double),
ENTRY(encode_float),
ENTRY(encode_double),
#undef ENTRY
{ NULL, NULL }
};
luaL_newlib(L, libs);
return 1;
}
/* protobuf encode routine */
static int lpb_typefmt(int fmt) {
switch (fmt) {
#define X(name, type, fmt) case fmt: return PB_T##name;
PB_TYPES(X)
#undef X
}
return -1;
}
static int lpb_packfmt(lua_State *L, int idx, pb_Buffer *b, const char **pfmt, int level) {
const char *fmt = *pfmt;
int type, ltype;
size_t len;
argcheck(L, level <= 100, 1, "format level overflow");
for (; *fmt != '\0'; ++fmt) {
switch (*fmt) {
case 'v': pb_addvarint64(b, (uint64_t)lpb_checkinteger(L, idx++)); break;
case 'd': pb_addfixed32(b, (uint32_t)lpb_checkinteger(L, idx++)); break;
case 'q': pb_addfixed64(b, (uint64_t)lpb_checkinteger(L, idx++)); break;
case 'c': pb_addslice(b, lpb_checkslice(L, idx++)); break;
case 's': pb_addbytes(b, lpb_checkslice(L, idx++)); break;
case '#': lpb_addlength(L, b, (size_t)lpb_checkinteger(L, idx++)); break;
case '(':
len = pb_bufflen(b);
++fmt;
idx = lpb_packfmt(L, idx, b, &fmt, level+1);
lpb_addlength(L, b, len);
break;
case ')':
if (level == 0) luaL_argerror(L, 1, "unexpected ')' in format");
*pfmt = fmt;
return idx;
case '\0':
default:
argcheck(L, (type = lpb_typefmt(*fmt)) >= 0,
1, "invalid formater: '%c'", *fmt);
ltype = lpb_addtype(L, b, idx, type, NULL);
argcheck(L, ltype == 0, idx, "%s expected for type '%s', got %s",
lua_typename(L, ltype), pb_typename(type, "<unknown>"),
luaL_typename(L, idx));
++idx;
}
}
if (level != 0) luaL_argerror(L, 2, "unmatch '(' in format");
*pfmt = fmt;
return idx;
}
static int Lpb_tohex(lua_State *L) {
pb_Slice s = lpb_checkslice(L, 1);
const char *hexa = "0123456789ABCDEF";
char hex[4] = "XX ";
lua_Integer r[2] = { 1, -1 };
luaL_Buffer lb;
rangerelat(L, 2, r, pb_len(s));
luaL_buffinit(L, &lb);
for (; r[0] <= r[1]; ++r[0]) {
unsigned int ch = s.p[r[0]-1];
hex[0] = hexa[(ch>>4)&0xF];
hex[1] = hexa[(ch )&0xF];
if (r[0] == r[1]) hex[2] = '\0';
luaL_addstring(&lb, hex);
}
luaL_pushresult(&lb);
return 1;
}
static int Lpb_result(lua_State *L) {
pb_Slice s = lpb_checkslice(L, 1);
lua_Integer r[2] = {1, -1}, range = rangerelat(L, 2, r, pb_len(s));
lua_pushlstring(L, s.p+r[0]-1, (size_t)range);
return 1;
}
static int Lbuf_new(lua_State *L) {
int i, top = lua_gettop(L);
pb_Buffer *buf = (pb_Buffer*)lua_newuserdata(L, sizeof(pb_Buffer));
pb_initbuffer(buf);
luaL_setmetatable(L, PB_BUFFER);
for (i = 1; i <= top; ++i)
pb_addslice(buf, lpb_checkslice(L, i));
return 1;
}
static int Lbuf_libcall(lua_State *L) {
int i, top = lua_gettop(L);
pb_Buffer *buf = (pb_Buffer*)lua_newuserdata(L, sizeof(pb_Buffer));
pb_initbuffer(buf);
luaL_setmetatable(L, PB_BUFFER);
for (i = 2; i <= top; ++i)
pb_addslice(buf, lpb_checkslice(L, i));
return 1;
}
static int Lbuf_tostring(lua_State *L) {
pb_Buffer *buf = check_buffer(L, 1);
lua_pushfstring(L, "pb.Buffer: %p", buf);
return 1;
}
static int Lbuf_reset(lua_State *L) {
pb_Buffer *buf = check_buffer(L, 1);
int i, top = lua_gettop(L);
pb_resetbuffer(buf);
for (i = 2; i <= top; ++i)
pb_addslice(buf, lpb_checkslice(L, i));
return_self(L);
}
static int Lbuf_len(lua_State *L) {
pb_Buffer *buf = check_buffer(L, 1);
lua_pushinteger(L, (lua_Integer)buf->size);
return 1;
}
static int Lbuf_pack(lua_State *L) {
pb_Buffer b, *pb = test_buffer(L, 1);
int idx = 1 + (pb != NULL);
const char *fmt = luaL_checkstring(L, idx++);
if (pb == NULL) pb_initbuffer(pb = &b);
lpb_packfmt(L, idx, pb, &fmt, 0);
if (pb != &b)
lua_settop(L, 1);
else {
pb_Slice ret = pb_result(pb);
lua_pushlstring(L, ret.p, pb_len(ret));
pb_resetbuffer(pb);
}
return 1;
}
LUALIB_API int luaopen_pb_buffer(lua_State *L) {
luaL_Reg libs[] = {
{ "__tostring", Lbuf_tostring },
{ "__len", Lbuf_len },
{ "__gc", Lbuf_reset },
{ "delete", Lbuf_reset },
{ "tohex", Lpb_tohex },
{ "result", Lpb_result },
#define ENTRY(name) { #name, Lbuf_##name }
ENTRY(new),
ENTRY(reset),
ENTRY(pack),
#undef ENTRY
{ NULL, NULL }
};
if (luaL_newmetatable(L, PB_BUFFER)) {
luaL_setfuncs(L, libs, 0);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
lua_createtable(L, 0, 1);
lua_pushcfunction(L, Lbuf_libcall);
lua_setfield(L, -2, "__call");
lua_setmetatable(L, -2);
}
return 1;
}
/* protobuf decode routine */
#define LPB_INITSTACKLEN 2
typedef struct lpb_Slice {
lpb_SliceEx curr;
lpb_SliceEx *buff;
size_t used;
size_t size;
lpb_SliceEx init_buff[LPB_INITSTACKLEN];
} lpb_Slice;
static void lpb_resetslice(lua_State *L, lpb_Slice *s, size_t size) {
if (size == sizeof(lpb_Slice)) {
if (s->buff != s->init_buff)
free(s->buff);
memset(s, 0, sizeof(lpb_Slice));
s->buff = s->init_buff;
s->size = LPB_INITSTACKLEN;
}
lua_pushnil(L);
lua_rawsetp(L, LUA_REGISTRYINDEX, s);
}
static lpb_SliceEx lpb_checkview(lua_State *L, int idx, lpb_SliceEx *ps) {
pb_Slice src = lpb_checkslice(L, idx);
lua_Integer r[2] = {1, -1}, range = rangerelat(L, idx+1, r, pb_len(src));
lpb_SliceEx ret;
if (ps) ps->base = src, ps->head = src.p;
ret.base.p = src.p + r[0] - 1;
ret.base.end = ret.base.p + range;
ret.head = src.p;
return ret;
}
static void lpb_enterview(lua_State *L, lpb_Slice *s, lpb_SliceEx view) {
if (s->used >= s->size) {
size_t newsize = s->size * 2;
lpb_SliceEx *oldp = s->buff != s->init_buff ? s->buff : NULL;
lpb_SliceEx *newp = (lpb_SliceEx*)realloc(oldp, newsize*sizeof(lpb_SliceEx));
if (newp == NULL) { luaL_error(L, "out of memory"); return; }
if (oldp == NULL) memcpy(newp, s->buff, s->used*sizeof(lpb_SliceEx));
s->buff = newp;
s->size = newsize;
}
s->buff[s->used++] = s->curr;
s->curr = view;
}
static void lpb_initslice(lua_State *L, int idx, lpb_Slice *s, size_t size) {
if (size == sizeof(lpb_Slice)) {
memset(s, 0, sizeof(lpb_Slice));
s->buff = s->init_buff;
s->size = LPB_INITSTACKLEN;
}
if (!lua_isnoneornil(L, idx)) {
lpb_SliceEx base, view = lpb_checkview(L, idx, &base);
s->curr = base;
if (size == sizeof(lpb_Slice)) lpb_enterview(L, s, view);
lua_pushvalue(L, idx);
lua_rawsetp(L, LUA_REGISTRYINDEX, s);
}
}
static int lpb_unpackscalar(lua_State *L, int *pidx, int top, int fmt, lpb_SliceEx *s) {
unsigned mode = default_lstate(L)->int64_mode;
lpb_Value v;
switch (fmt) {
case 'v':
if (pb_readvarint64(&s->base, &v.u64) == 0)
luaL_error(L, "invalid varint value at offset %d", lpb_offset(s));
lpb_pushinteger(L, v.u64, mode);
break;
case 'd':
if (pb_readfixed32(&s->base, &v.u32) == 0)
luaL_error(L, "invalid fixed32 value at offset %d", lpb_offset(s));
lpb_pushinteger(L, v.u32, mode);
break;
case 'q':
if (pb_readfixed64(&s->base, &v.u64) == 0)
luaL_error(L, "invalid fixed64 value at offset %d", lpb_offset(s));
lpb_pushinteger(L, v.u64, mode);
break;
case 's':
if (pb_readbytes(&s->base, &v.s->base) == 0)
luaL_error(L, "invalid bytes value at offset %d", lpb_offset(s));
lua_pushlstring(L, v.s->base.p, pb_len(v.s->base));
break;
case 'c':
argcheck(L, *pidx <= top, 1, "format argument exceed");
v.lint = luaL_checkinteger(L, *pidx++);
if (pb_readslice(&s->base, (size_t)v.lint, &v.s->base) == 0)
luaL_error(L, "invalid sub string at offset %d", lpb_offset(s));
lua_pushlstring(L, v.s->base.p, pb_len(v.s->base));
break;
default:
return 0;
}
return 1;
}
static int lpb_unpackloc(lua_State *L, int *pidx, int top, int fmt, lpb_SliceEx *s, int *prets) {
lua_Integer li;
size_t len = s->base.end - s->head;
switch (fmt) {
case '@':
lua_pushinteger(L, lpb_offset(s));
++*prets;
break;
case '*': case '+':
argcheck(L, *pidx <= top, 1, "format argument exceed");
if (fmt == '*')
li = posrelat(luaL_checkinteger(L, *pidx++), len);
else
li = lpb_offset(s) + luaL_checkinteger(L, *pidx++);
if (li == 0) li = 1;
if (li > (lua_Integer)len) li = (lua_Integer)len + 1;
s->base.p = s->head + li - 1;
break;
default:
return 0;
}
return 1;
}
static int lpb_unpackfmt(lua_State *L, int idx, const char *fmt, lpb_SliceEx *s) {
int rets = 0, top = lua_gettop(L), type;
for (; *fmt != '\0'; ++fmt) {
if (lpb_unpackloc(L, &idx, top, *fmt, s, &rets))
continue;
if (s->base.p >= s->base.end) { lua_pushnil(L); return rets + 1; }
luaL_checkstack(L, 1, "too many values");
if (!lpb_unpackscalar(L, &idx, top, *fmt, s)) {
argcheck(L, (type = lpb_typefmt(*fmt)) >= 0,
1, "invalid formater: '%c'", *fmt);
lpb_readtype(L, default_lstate(L), type, s);
}
++rets;
}
return rets;
}
static lpb_Slice *check_lslice(lua_State *L, int idx) {
lpb_SliceEx *s = check_slice(L, idx);
argcheck(L, lua_rawlen(L, 1) == sizeof(lpb_Slice),
idx, "unsupport operation for raw mode slice");
return (lpb_Slice*)s;
}
static int Lslice_new(lua_State *L) {
lpb_Slice *s;
lua_settop(L, 3);
s = (lpb_Slice*)lua_newuserdata(L, sizeof(lpb_Slice));
lpb_initslice(L, 1, s, sizeof(lpb_Slice));
luaL_setmetatable(L, PB_SLICE);
return 1;
}
static int Lslice_libcall(lua_State *L) {
lpb_Slice *s;
lua_settop(L, 4);
s = (lpb_Slice*)lua_newuserdata(L, sizeof(lpb_Slice));
lpb_initslice(L, 2, s, sizeof(lpb_Slice));
luaL_setmetatable(L, PB_SLICE);
return 1;
}
static int Lslice_reset(lua_State *L) {
lpb_Slice *s = check_lslice(L, 1);
size_t size = lua_rawlen(L, 1);
lpb_resetslice(L, s, size);
if (!lua_isnoneornil(L, 2))
lpb_initslice(L, 2, s, size);
return_self(L);