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为hexencode与hexdecode增加特性支持.
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@CandyMi
CandyMi authored May 27, 2022
1 parent f597608 commit f9b2a83
Showing 1 changed file with 40 additions and 82 deletions.
122 changes: 40 additions & 82 deletions luaclib/src/lcrypt/hex.c
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Original file line number Diff line number Diff line change
@@ -1,41 +1,8 @@
#include "lcrypt.h"

#define HEX_CHUNK (65535)
static char lencode[] = "0123456789abcdef";

static const uint8_t encode[256][2] = {
{'0', '0'}, {'0', '1'}, {'0', '2'}, {'0', '3'}, {'0', '4'}, {'0', '5'}, {'0', '6'}, {'0', '7'},
{'0', '8'}, {'0', '9'}, {'0', 'a'}, {'0', 'b'}, {'0', 'c'}, {'0', 'd'}, {'0', 'e'}, {'0', 'f'},
{'1', '0'}, {'1', '1'}, {'1', '2'}, {'1', '3'}, {'1', '4'}, {'1', '5'}, {'1', '6'}, {'1', '7'},
{'1', '8'}, {'1', '9'}, {'1', 'a'}, {'1', 'b'}, {'1', 'c'}, {'1', 'd'}, {'1', 'e'}, {'1', 'f'},
{'2', '0'}, {'2', '1'}, {'2', '2'}, {'2', '3'}, {'2', '4'}, {'2', '5'}, {'2', '6'}, {'2', '7'},
{'2', '8'}, {'2', '9'}, {'2', 'a'}, {'2', 'b'}, {'2', 'c'}, {'2', 'd'}, {'2', 'e'}, {'2', 'f'},
{'3', '0'}, {'3', '1'}, {'3', '2'}, {'3', '3'}, {'3', '4'}, {'3', '5'}, {'3', '6'}, {'3', '7'},
{'3', '8'}, {'3', '9'}, {'3', 'a'}, {'3', 'b'}, {'3', 'c'}, {'3', 'd'}, {'3', 'e'}, {'3', 'f'},
{'4', '0'}, {'4', '1'}, {'4', '2'}, {'4', '3'}, {'4', '4'}, {'4', '5'}, {'4', '6'}, {'4', '7'},
{'4', '8'}, {'4', '9'}, {'4', 'a'}, {'4', 'b'}, {'4', 'c'}, {'4', 'd'}, {'4', 'e'}, {'4', 'f'},
{'5', '0'}, {'5', '1'}, {'5', '2'}, {'5', '3'}, {'5', '4'}, {'5', '5'}, {'5', '6'}, {'5', '7'},
{'5', '8'}, {'5', '9'}, {'5', 'a'}, {'5', 'b'}, {'5', 'c'}, {'5', 'd'}, {'5', 'e'}, {'5', 'f'},
{'6', '0'}, {'6', '1'}, {'6', '2'}, {'6', '3'}, {'6', '4'}, {'6', '5'}, {'6', '6'}, {'6', '7'},
{'6', '8'}, {'6', '9'}, {'6', 'a'}, {'6', 'b'}, {'6', 'c'}, {'6', 'd'}, {'6', 'e'}, {'6', 'f'},
{'7', '0'}, {'7', '1'}, {'7', '2'}, {'7', '3'}, {'7', '4'}, {'7', '5'}, {'7', '6'}, {'7', '7'},
{'7', '8'}, {'7', '9'}, {'7', 'a'}, {'7', 'b'}, {'7', 'c'}, {'7', 'd'}, {'7', 'e'}, {'7', 'f'},
{'8', '0'}, {'8', '1'}, {'8', '2'}, {'8', '3'}, {'8', '4'}, {'8', '5'}, {'8', '6'}, {'8', '7'},
{'8', '8'}, {'8', '9'}, {'8', 'a'}, {'8', 'b'}, {'8', 'c'}, {'8', 'd'}, {'8', 'e'}, {'8', 'f'},
{'9', '0'}, {'9', '1'}, {'9', '2'}, {'9', '3'}, {'9', '4'}, {'9', '5'}, {'9', '6'}, {'9', '7'},
{'9', '8'}, {'9', '9'}, {'9', 'a'}, {'9', 'b'}, {'9', 'c'}, {'9', 'd'}, {'9', 'e'}, {'9', 'f'},
{'a', '0'}, {'a', '1'}, {'a', '2'}, {'a', '3'}, {'a', '4'}, {'a', '5'}, {'a', '6'}, {'a', '7'},
{'a', '8'}, {'a', '9'}, {'a', 'a'}, {'a', 'b'}, {'a', 'c'}, {'a', 'd'}, {'a', 'e'}, {'a', 'f'},
{'b', '0'}, {'b', '1'}, {'b', '2'}, {'b', '3'}, {'b', '4'}, {'b', '5'}, {'b', '6'}, {'b', '7'},
{'b', '8'}, {'b', '9'}, {'b', 'a'}, {'b', 'b'}, {'b', 'c'}, {'b', 'd'}, {'b', 'e'}, {'b', 'f'},
{'c', '0'}, {'c', '1'}, {'c', '2'}, {'c', '3'}, {'c', '4'}, {'c', '5'}, {'c', '6'}, {'c', '7'},
{'c', '8'}, {'c', '9'}, {'c', 'a'}, {'c', 'b'}, {'c', 'c'}, {'c', 'd'}, {'c', 'e'}, {'c', 'f'},
{'d', '0'}, {'d', '1'}, {'d', '2'}, {'d', '3'}, {'d', '4'}, {'d', '5'}, {'d', '6'}, {'d', '7'},
{'d', '8'}, {'d', '9'}, {'d', 'a'}, {'d', 'b'}, {'d', 'c'}, {'d', 'd'}, {'d', 'e'}, {'d', 'f'},
{'e', '0'}, {'e', '1'}, {'e', '2'}, {'e', '3'}, {'e', '4'}, {'e', '5'}, {'e', '6'}, {'e', '7'},
{'e', '8'}, {'e', '9'}, {'e', 'a'}, {'e', 'b'}, {'e', 'c'}, {'e', 'd'}, {'e', 'e'}, {'e', 'f'},
{'f', '0'}, {'f', '1'}, {'f', '2'}, {'f', '3'}, {'f', '4'}, {'f', '5'}, {'f', '6'}, {'f', '7'},
{'f', '8'}, {'f', '9'}, {'f', 'a'}, {'f', 'b'}, {'f', 'c'}, {'f', 'd'}, {'f', 'e'}, {'f', 'f'},
};
static char hencode[] = "0123456789ABCDEF";

static const char deindex[256] = {
-1, -1, -1, -1, -1, -1, -1, -1,
Expand Down Expand Up @@ -72,47 +39,31 @@ static const char deindex[256] = {
-1, -1, -1, -1, -1, -1, -1, -1,
};

static const uint8_t decode[16][16] = {
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
{ 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 },
{ 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47 },
{ 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63 },
{ 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79 },
{ 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95 },
{ 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111 },
{ 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127 },
{ 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143 },
{ 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159 },
{ 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175 },
{ 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191 },
{ 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207 },
{ 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223 },
{ 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239 },
{ 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255 },
};

int lfromhex(lua_State *L) {
size_t tsize = 0;
const uint8_t* text = (const uint8_t *)luaL_checklstring(L, 1, &tsize);
if (!text || tsize < 2 || (tsize & 0x01) == 0x01)
if (!text || tsize < 2)
return luaL_error(L, "Invalid hexdecode text size %d", (int)tsize);

size_t dsize = tsize / 2;
char *buffer;
if (tsize <= HEX_CHUNK)
buffer = alloca(dsize);
else
buffer = lua_newuserdata(L, dsize);
luaL_Buffer B;
luaL_buffinit(L, &B);

size_t i, idx = 0;
int8_t hi, lo;
for (i = 0; i < tsize; i += 2) {
hi = deindex[text[i]]; lo = deindex[text[i+1]];
if (hi == -1 || lo == -1)
return luaL_error(L, "Invalid hexdecode char pos in %d", i);
buffer[idx++] = decode[hi][lo];
size_t idx = 0; int8_t hi; int8_t lo;

while (idx < tsize){
while(isspace((uint8_t)text[idx]))
idx++;
if (idx >= tsize)
break;
/* 解码计算 */
hi = text[idx++]; hi = deindex[hi];
lo = text[idx++]; lo = deindex[lo];
if (lo == -1 || hi == -1)
return luaL_error(L, "Invalid hexdecode char pos in %d and %d", idx - 2, idx - 1);
/* 还原数据 */
luaL_addchar(&B, hi << 4 | lo);
}
lua_pushlstring(L, buffer, dsize);
luaL_pushresult(&B);
return 1;
}

Expand All @@ -122,20 +73,27 @@ int ltohex(lua_State *L) {
if (!text || tsize == 0)
return luaL_error(L, "Invalid hexencode text size %d", (int)tsize);

size_t esize = tsize * 2;
char *buffer;
if (tsize <= HEX_CHUNK)
buffer = alloca(esize);
else
buffer = lua_newuserdata(L, esize);
/* 默认使用小写编码 */
const char *etable = lencode;
if (lua_isboolean(L, 2) && lua_toboolean(L, 2))
etable = hencode;

/* 编码之间加上空格 */
size_t n = 2;
if (lua_isboolean(L, 3) && lua_toboolean(L, 3))
n = 3;

luaL_Buffer B;
luaL_buffinit(L, &B);

const uint8_t *code;
size_t i, idx = 0;
for (i = 0; i < tsize; i++) {
code = encode[text[i]];
buffer[idx++] = code[0];
buffer[idx++] = code[1];
uint8_t code;
for (size_t i = 0; i < tsize; i++) {
code = text[i];
luaL_addchar(&B, etable[code >> 4]);
luaL_addchar(&B, etable[code & 0xF]);
if (n == 3)
luaL_addchar(&B, ' ');
}
lua_pushlstring(L, buffer, esize);
luaL_pushresult(&B);
return 1;
}

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