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parsers: use a lookup table to convert hex to binary...
Siddharth Agarwal -
r19718:d69e0672 default
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@@ -14,16 +14,32 b''
14
14
15 #include "util.h"
15 #include "util.h"
16
16
17 static int8_t hextable[256] = {
18 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
19 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
20 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
21 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, -1, -1, -1, -1, -1, -1, /* 0-9 */
22 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* A-F */
23 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
24 -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* a-f */
25 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
26 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
27 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
28 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
29 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
30 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
31 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
32 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
33 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
34 };
35
17 static inline int hexdigit(const char *p, Py_ssize_t off)
36 static inline int hexdigit(const char *p, Py_ssize_t off)
18 {
37 {
19 char c = p[off];
38 int8_t val = hextable[(unsigned char)p[off]];
20
39
21 if (c >= '0' && c <= '9')
40 if (val >= 0) {
22 return c - '0';
41 return val;
23 if (c >= 'a' && c <= 'f')
42 }
24 return c - 'a' + 10;
25 if (c >= 'A' && c <= 'F')
26 return c - 'A' + 10;
27
43
28 PyErr_SetString(PyExc_ValueError, "input contains non-hex character");
44 PyErr_SetString(PyExc_ValueError, "input contains non-hex character");
29 return 0;
45 return 0;
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