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bazarr/libs/msgpack/unpack_template.h

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/*
* MessagePack unpacking routine template
*
* Copyright (C) 2008-2010 FURUHASHI Sadayuki
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef USE_CASE_RANGE
#if !defined(_MSC_VER)
#define USE_CASE_RANGE
#endif
#endif
typedef struct unpack_stack {
PyObject* obj;
Py_ssize_t size;
Py_ssize_t count;
unsigned int ct;
PyObject* map_key;
} unpack_stack;
struct unpack_context {
unpack_user user;
unsigned int cs;
unsigned int trail;
unsigned int top;
/*
unpack_stack* stack;
unsigned int stack_size;
unpack_stack embed_stack[MSGPACK_EMBED_STACK_SIZE];
*/
unpack_stack stack[MSGPACK_EMBED_STACK_SIZE];
};
static inline void unpack_init(unpack_context* ctx)
{
ctx->cs = CS_HEADER;
ctx->trail = 0;
ctx->top = 0;
/*
ctx->stack = ctx->embed_stack;
ctx->stack_size = MSGPACK_EMBED_STACK_SIZE;
*/
ctx->stack[0].obj = unpack_callback_root(&ctx->user);
}
/*
static inline void unpack_destroy(unpack_context* ctx)
{
if(ctx->stack_size != MSGPACK_EMBED_STACK_SIZE) {
free(ctx->stack);
}
}
*/
static inline PyObject* unpack_data(unpack_context* ctx)
{
return (ctx)->stack[0].obj;
}
static inline void unpack_clear(unpack_context *ctx)
{
Py_CLEAR(ctx->stack[0].obj);
}
template <bool construct>
static inline int unpack_execute(unpack_context* ctx, const char* data, Py_ssize_t len, Py_ssize_t* off)
{
assert(len >= *off);
const unsigned char* p = (unsigned char*)data + *off;
const unsigned char* const pe = (unsigned char*)data + len;
const void* n = p;
unsigned int trail = ctx->trail;
unsigned int cs = ctx->cs;
unsigned int top = ctx->top;
unpack_stack* stack = ctx->stack;
/*
unsigned int stack_size = ctx->stack_size;
*/
unpack_user* user = &ctx->user;
PyObject* obj = NULL;
unpack_stack* c = NULL;
int ret;
#define construct_cb(name) \
construct && unpack_callback ## name
#define push_simple_value(func) \
if(construct_cb(func)(user, &obj) < 0) { goto _failed; } \
goto _push
#define push_fixed_value(func, arg) \
if(construct_cb(func)(user, arg, &obj) < 0) { goto _failed; } \
goto _push
#define push_variable_value(func, base, pos, len) \
if(construct_cb(func)(user, \
(const char*)base, (const char*)pos, len, &obj) < 0) { goto _failed; } \
goto _push
#define again_fixed_trail(_cs, trail_len) \
trail = trail_len; \
cs = _cs; \
goto _fixed_trail_again
#define again_fixed_trail_if_zero(_cs, trail_len, ifzero) \
trail = trail_len; \
if(trail == 0) { goto ifzero; } \
cs = _cs; \
goto _fixed_trail_again
#define start_container(func, count_, ct_) \
if(top >= MSGPACK_EMBED_STACK_SIZE) { ret = -3; goto _end; } \
if(construct_cb(func)(user, count_, &stack[top].obj) < 0) { goto _failed; } \
if((count_) == 0) { obj = stack[top].obj; \
if (construct_cb(func##_end)(user, &obj) < 0) { goto _failed; } \
goto _push; } \
stack[top].ct = ct_; \
stack[top].size = count_; \
stack[top].count = 0; \
++top; \
goto _header_again
#define NEXT_CS(p) ((unsigned int)*p & 0x1f)
#ifdef USE_CASE_RANGE
#define SWITCH_RANGE_BEGIN switch(*p) {
#define SWITCH_RANGE(FROM, TO) case FROM ... TO:
#define SWITCH_RANGE_DEFAULT default:
#define SWITCH_RANGE_END }
#else
#define SWITCH_RANGE_BEGIN { if(0) {
#define SWITCH_RANGE(FROM, TO) } else if(FROM <= *p && *p <= TO) {
#define SWITCH_RANGE_DEFAULT } else {
#define SWITCH_RANGE_END } }
#endif
if(p == pe) { goto _out; }
do {
switch(cs) {
case CS_HEADER:
SWITCH_RANGE_BEGIN
SWITCH_RANGE(0x00, 0x7f) // Positive Fixnum
push_fixed_value(_uint8, *(uint8_t*)p);
SWITCH_RANGE(0xe0, 0xff) // Negative Fixnum
push_fixed_value(_int8, *(int8_t*)p);
SWITCH_RANGE(0xc0, 0xdf) // Variable
switch(*p) {
case 0xc0: // nil
push_simple_value(_nil);
//case 0xc1: // never used
case 0xc2: // false
push_simple_value(_false);
case 0xc3: // true
push_simple_value(_true);
case 0xc4: // bin 8
again_fixed_trail(NEXT_CS(p), 1);
case 0xc5: // bin 16
again_fixed_trail(NEXT_CS(p), 2);
case 0xc6: // bin 32
again_fixed_trail(NEXT_CS(p), 4);
case 0xc7: // ext 8
again_fixed_trail(NEXT_CS(p), 1);
case 0xc8: // ext 16
again_fixed_trail(NEXT_CS(p), 2);
case 0xc9: // ext 32
again_fixed_trail(NEXT_CS(p), 4);
case 0xca: // float
case 0xcb: // double
case 0xcc: // unsigned int 8
case 0xcd: // unsigned int 16
case 0xce: // unsigned int 32
case 0xcf: // unsigned int 64
case 0xd0: // signed int 8
case 0xd1: // signed int 16
case 0xd2: // signed int 32
case 0xd3: // signed int 64
again_fixed_trail(NEXT_CS(p), 1 << (((unsigned int)*p) & 0x03));
case 0xd4: // fixext 1
case 0xd5: // fixext 2
case 0xd6: // fixext 4
case 0xd7: // fixext 8
again_fixed_trail_if_zero(ACS_EXT_VALUE,
(1 << (((unsigned int)*p) & 0x03))+1,
_ext_zero);
case 0xd8: // fixext 16
again_fixed_trail_if_zero(ACS_EXT_VALUE, 16+1, _ext_zero);
case 0xd9: // str 8
again_fixed_trail(NEXT_CS(p), 1);
case 0xda: // raw 16
case 0xdb: // raw 32
case 0xdc: // array 16
case 0xdd: // array 32
case 0xde: // map 16
case 0xdf: // map 32
again_fixed_trail(NEXT_CS(p), 2 << (((unsigned int)*p) & 0x01));
default:
ret = -2;
goto _end;
}
SWITCH_RANGE(0xa0, 0xbf) // FixRaw
again_fixed_trail_if_zero(ACS_RAW_VALUE, ((unsigned int)*p & 0x1f), _raw_zero);
SWITCH_RANGE(0x90, 0x9f) // FixArray
start_container(_array, ((unsigned int)*p) & 0x0f, CT_ARRAY_ITEM);
SWITCH_RANGE(0x80, 0x8f) // FixMap
start_container(_map, ((unsigned int)*p) & 0x0f, CT_MAP_KEY);
SWITCH_RANGE_DEFAULT
ret = -2;
goto _end;
SWITCH_RANGE_END
// end CS_HEADER
_fixed_trail_again:
++p;
default:
if((size_t)(pe - p) < trail) { goto _out; }
n = p; p += trail - 1;
switch(cs) {
case CS_EXT_8:
again_fixed_trail_if_zero(ACS_EXT_VALUE, *(uint8_t*)n+1, _ext_zero);
case CS_EXT_16:
again_fixed_trail_if_zero(ACS_EXT_VALUE,
_msgpack_load16(uint16_t,n)+1,
_ext_zero);
case CS_EXT_32:
again_fixed_trail_if_zero(ACS_EXT_VALUE,
_msgpack_load32(uint32_t,n)+1,
_ext_zero);
case CS_FLOAT: {
double f = _PyFloat_Unpack4((unsigned char*)n, 0);
push_fixed_value(_float, f); }
case CS_DOUBLE: {
double f = _PyFloat_Unpack8((unsigned char*)n, 0);
push_fixed_value(_double, f); }
case CS_UINT_8:
push_fixed_value(_uint8, *(uint8_t*)n);
case CS_UINT_16:
push_fixed_value(_uint16, _msgpack_load16(uint16_t,n));
case CS_UINT_32:
push_fixed_value(_uint32, _msgpack_load32(uint32_t,n));
case CS_UINT_64:
push_fixed_value(_uint64, _msgpack_load64(uint64_t,n));
case CS_INT_8:
push_fixed_value(_int8, *(int8_t*)n);
case CS_INT_16:
push_fixed_value(_int16, _msgpack_load16(int16_t,n));
case CS_INT_32:
push_fixed_value(_int32, _msgpack_load32(int32_t,n));
case CS_INT_64:
push_fixed_value(_int64, _msgpack_load64(int64_t,n));
case CS_BIN_8:
again_fixed_trail_if_zero(ACS_BIN_VALUE, *(uint8_t*)n, _bin_zero);
case CS_BIN_16:
again_fixed_trail_if_zero(ACS_BIN_VALUE, _msgpack_load16(uint16_t,n), _bin_zero);
case CS_BIN_32:
again_fixed_trail_if_zero(ACS_BIN_VALUE, _msgpack_load32(uint32_t,n), _bin_zero);
case ACS_BIN_VALUE:
_bin_zero:
push_variable_value(_bin, data, n, trail);
case CS_RAW_8:
again_fixed_trail_if_zero(ACS_RAW_VALUE, *(uint8_t*)n, _raw_zero);
case CS_RAW_16:
again_fixed_trail_if_zero(ACS_RAW_VALUE, _msgpack_load16(uint16_t,n), _raw_zero);
case CS_RAW_32:
again_fixed_trail_if_zero(ACS_RAW_VALUE, _msgpack_load32(uint32_t,n), _raw_zero);
case ACS_RAW_VALUE:
_raw_zero:
push_variable_value(_raw, data, n, trail);
case ACS_EXT_VALUE:
_ext_zero:
push_variable_value(_ext, data, n, trail);
case CS_ARRAY_16:
start_container(_array, _msgpack_load16(uint16_t,n), CT_ARRAY_ITEM);
case CS_ARRAY_32:
/* FIXME security guard */
start_container(_array, _msgpack_load32(uint32_t,n), CT_ARRAY_ITEM);
case CS_MAP_16:
start_container(_map, _msgpack_load16(uint16_t,n), CT_MAP_KEY);
case CS_MAP_32:
/* FIXME security guard */
start_container(_map, _msgpack_load32(uint32_t,n), CT_MAP_KEY);
default:
goto _failed;
}
}
_push:
if(top == 0) { goto _finish; }
c = &stack[top-1];
switch(c->ct) {
case CT_ARRAY_ITEM:
if(construct_cb(_array_item)(user, c->count, &c->obj, obj) < 0) { goto _failed; }
if(++c->count == c->size) {
obj = c->obj;
if (construct_cb(_array_end)(user, &obj) < 0) { goto _failed; }
--top;
/*printf("stack pop %d\n", top);*/
goto _push;
}
goto _header_again;
case CT_MAP_KEY:
c->map_key = obj;
c->ct = CT_MAP_VALUE;
goto _header_again;
case CT_MAP_VALUE:
if(construct_cb(_map_item)(user, c->count, &c->obj, c->map_key, obj) < 0) { goto _failed; }
if(++c->count == c->size) {
obj = c->obj;
if (construct_cb(_map_end)(user, &obj) < 0) { goto _failed; }
--top;
/*printf("stack pop %d\n", top);*/
goto _push;
}
c->ct = CT_MAP_KEY;
goto _header_again;
default:
goto _failed;
}
_header_again:
cs = CS_HEADER;
++p;
} while(p != pe);
goto _out;
_finish:
if (!construct)
unpack_callback_nil(user, &obj);
stack[0].obj = obj;
++p;
ret = 1;
/*printf("-- finish --\n"); */
goto _end;
_failed:
/*printf("** FAILED **\n"); */
ret = -1;
goto _end;
_out:
ret = 0;
goto _end;
_end:
ctx->cs = cs;
ctx->trail = trail;
ctx->top = top;
*off = p - (const unsigned char*)data;
return ret;
#undef construct_cb
}
#undef SWITCH_RANGE_BEGIN
#undef SWITCH_RANGE
#undef SWITCH_RANGE_DEFAULT
#undef SWITCH_RANGE_END
#undef push_simple_value
#undef push_fixed_value
#undef push_variable_value
#undef again_fixed_trail
#undef again_fixed_trail_if_zero
#undef start_container
template <unsigned int fixed_offset, unsigned int var_offset>
static inline int unpack_container_header(unpack_context* ctx, const char* data, Py_ssize_t len, Py_ssize_t* off)
{
assert(len >= *off);
uint32_t size;
const unsigned char *const p = (unsigned char*)data + *off;
#define inc_offset(inc) \
if (len - *off < inc) \
return 0; \
*off += inc;
switch (*p) {
case var_offset:
inc_offset(3);
size = _msgpack_load16(uint16_t, p + 1);
break;
case var_offset + 1:
inc_offset(5);
size = _msgpack_load32(uint32_t, p + 1);
break;
#ifdef USE_CASE_RANGE
case fixed_offset + 0x0 ... fixed_offset + 0xf:
#else
case fixed_offset + 0x0:
case fixed_offset + 0x1:
case fixed_offset + 0x2:
case fixed_offset + 0x3:
case fixed_offset + 0x4:
case fixed_offset + 0x5:
case fixed_offset + 0x6:
case fixed_offset + 0x7:
case fixed_offset + 0x8:
case fixed_offset + 0x9:
case fixed_offset + 0xa:
case fixed_offset + 0xb:
case fixed_offset + 0xc:
case fixed_offset + 0xd:
case fixed_offset + 0xe:
case fixed_offset + 0xf:
#endif
++*off;
size = ((unsigned int)*p) & 0x0f;
break;
default:
PyErr_SetString(PyExc_ValueError, "Unexpected type header on stream");
return -1;
}
unpack_callback_uint32(&ctx->user, size, &ctx->stack[0].obj);
return 1;
}
#undef SWITCH_RANGE_BEGIN
#undef SWITCH_RANGE
#undef SWITCH_RANGE_DEFAULT
#undef SWITCH_RANGE_END
static const execute_fn unpack_construct = &unpack_execute<true>;
static const execute_fn unpack_skip = &unpack_execute<false>;
static const execute_fn read_array_header = &unpack_container_header<0x90, 0xdc>;
static const execute_fn read_map_header = &unpack_container_header<0x80, 0xde>;
#undef NEXT_CS
/* vim: set ts=4 sw=4 sts=4 expandtab */
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