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| 16 | #endif |
16 | #endif |
| 17 | #if PATCHLEVEL < 6 |
17 | #if PATCHLEVEL < 6 |
| 18 | # define call_sv perl_call_sv |
18 | # define call_sv perl_call_sv |
| 19 | #endif |
19 | #endif |
| 20 | |
20 | |
| 21 | #define KEYLEN 8 // number of bytes in the l, m, r fields |
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| 22 | |
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| 23 | static SV * |
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| 24 | new_key (void) |
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| 25 | { |
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| 26 | SV *new = NEWSV(0, KEYLEN); |
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| 27 | SvPOK_only (new); |
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| 28 | SvCUR_set (new, KEYLEN); |
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| 29 | |
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| 30 | return new; |
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| 31 | } |
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| 32 | |
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| 33 | MODULE = XML::DB PACKAGE = XML::DB::Key |
21 | MODULE = XML::DB PACKAGE = XML::DB::Key |
| 34 | |
22 | |
| 35 | PROTOTYPES: ENABLE |
23 | PROTOTYPES: ENABLE |
| 36 | |
24 | |
| 37 | int |
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| 38 | KEYLEN() |
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| 39 | CODE: |
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| 40 | RETVAL = KEYLEN; |
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| 41 | OUTPUT: |
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| 42 | RETVAL |
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| 43 | |
25 | |
| 44 | SV * |
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| 45 | 0() |
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| 46 | ALIAS: |
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| 47 | 1 = 255 |
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| 48 | CODE: |
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| 49 | RETVAL = new_key (); |
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| 50 | memset (SvPVX (RETVAL), ix, KEYLEN); |
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| 51 | OUTPUT: |
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| 52 | RETVAL |
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| 53 | |
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| 54 | # calculcate l + r |
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| 55 | SV * |
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| 56 | m(ls,rs) |
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| 57 | SV * ls |
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| 58 | SV * rs |
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| 59 | CODE: |
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| 60 | unsigned char *l, *m, *r, *me; |
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| 61 | unsigned int mx, carry; |
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| 62 | |
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| 63 | RETVAL = new_key (); |
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| 64 | |
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| 65 | l = SvPVX (ls ) + KEYLEN; |
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| 66 | r = SvPVX (rs ) + KEYLEN; |
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| 67 | m = (me = SvPVX (RETVAL)) + KEYLEN; |
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| 68 | |
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| 69 | me [0] = 'U'; |
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| 70 | me [1] = 'U'; |
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| 71 | |
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| 72 | mx = (unsigned int)*--l + (unsigned int)*--r + 1; *--m = (mx & 0x0ff) >> 1; |
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| 73 | carry = mx & 0x100; |
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| 74 | |
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| 75 | do |
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| 76 | { |
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| 77 | mx = (unsigned int)*--l + (unsigned int)*--r + (carry >> 8); *--m = (mx & 0x0ff) >> 1; |
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| 78 | |
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| 79 | m[1] |= (mx & 0x001) << 7; |
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| 80 | carry = (mx & 0x100); |
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| 81 | } |
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| 82 | while (me < m); |
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| 83 | |
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| 84 | m[0] |= carry >> 1; |
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| 85 | |
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| 86 | OUTPUT: |
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| 87 | RETVAL |
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| 88 | |
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| 89 | |
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