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1 | #define PERL_NO_GET_CONTEXT |
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2 | #include "EXTERN.h" |
3 | #include "perl.h" |
4 | #include "XSUB.h" |
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5 | #include "byterun.h" |
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6 | |
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7 | /* Something arbitary for a buffer size */ |
8 | #define BYTELOADER_BUFFER 8096 |
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9 | |
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10 | int |
11 | bl_getc(struct byteloader_fdata *data) |
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12 | { |
13 | dTHX; |
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14 | if (SvCUR(data->datasv) <= data->next_out) { |
15 | int result; |
16 | /* Run out of buffered data, so attempt to read some more */ |
17 | *(SvPV_nolen (data->datasv)) = '\0'; |
18 | SvCUR_set (data->datasv, 0); |
19 | data->next_out = 0; |
20 | result = FILTER_READ (data->idx + 1, data->datasv, BYTELOADER_BUFFER); |
21 | |
22 | /* Filter returned error, or we got EOF and no data, then return EOF. |
23 | Not sure if filter is allowed to return EOF and add data simultaneously |
24 | Think not, but will bullet proof against it. */ |
25 | if (result < 0 || SvCUR(data->datasv) == 0) |
26 | return EOF; |
27 | /* Else there must be at least one byte present, which is good enough */ |
28 | } |
29 | |
30 | return *((char *) SvPV_nolen (data->datasv) + data->next_out++); |
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31 | } |
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32 | |
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33 | int |
34 | bl_read(struct byteloader_fdata *data, char *buf, size_t size, size_t n) |
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35 | { |
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36 | dTHX; |
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37 | char *start; |
38 | STRLEN len; |
39 | size_t wanted = size * n; |
40 | |
41 | start = SvPV (data->datasv, len); |
42 | if (len < (data->next_out + wanted)) { |
43 | int result; |
44 | |
45 | /* Shuffle data to start of buffer */ |
46 | len -= data->next_out; |
47 | if (len) { |
48 | memmove (start, start + data->next_out, len + 1); |
49 | SvCUR_set (data->datasv, len); |
50 | } else { |
51 | *start = '\0'; /* Avoid call to memmove. */ |
52 | SvCUR_set (data->datasv, 0); |
53 | } |
54 | data->next_out = 0; |
55 | |
56 | /* Attempt to read more data. */ |
57 | do { |
58 | result = FILTER_READ (data->idx + 1, data->datasv, BYTELOADER_BUFFER); |
59 | |
60 | start = SvPV (data->datasv, len); |
61 | } while (result > 0 && len < wanted); |
62 | /* Loop while not (EOF || error) and short reads */ |
63 | |
64 | /* If not enough data read, truncate copy */ |
65 | if (wanted > len) |
66 | wanted = len; |
67 | } |
68 | |
69 | if (wanted > 0) { |
70 | memcpy (buf, start + data->next_out, wanted); |
71 | data->next_out += wanted; |
72 | wanted /= size; |
73 | } |
74 | return (int) wanted; |
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75 | } |
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76 | |
77 | static I32 |
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78 | byteloader_filter(pTHX_ int idx, SV *buf_sv, int maxlen) |
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79 | { |
80 | OP *saveroot = PL_main_root; |
81 | OP *savestart = PL_main_start; |
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82 | struct byteloader_state bstate; |
83 | struct byteloader_fdata data; |
84 | |
85 | data.next_out = 0; |
86 | data.datasv = FILTER_DATA(idx); |
87 | data.idx = idx; |
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88 | |
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89 | bstate.bs_fdata = &data; |
90 | bstate.bs_obj_list = Null(void**); |
91 | bstate.bs_obj_list_fill = -1; |
92 | bstate.bs_sv = Nullsv; |
93 | bstate.bs_iv_overflows = 0; |
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94 | |
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95 | byterun(aTHX_ &bstate); |
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96 | |
97 | if (PL_in_eval) { |
98 | OP *o; |
99 | |
100 | PL_eval_start = PL_main_start; |
101 | |
102 | o = newSVOP(OP_CONST, 0, newSViv(1)); |
103 | PL_eval_root = newLISTOP(OP_LINESEQ, 0, PL_main_root, o); |
104 | PL_main_root->op_next = o; |
105 | PL_eval_root = newUNOP(OP_LEAVEEVAL, 0, PL_eval_root); |
106 | o->op_next = PL_eval_root; |
107 | |
108 | PL_main_root = saveroot; |
109 | PL_main_start = savestart; |
110 | } |
111 | |
112 | return 0; |
113 | } |
114 | |
115 | MODULE = ByteLoader PACKAGE = ByteLoader |
116 | |
117 | PROTOTYPES: ENABLE |
118 | |
119 | void |
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120 | import(package="ByteLoader", ...) |
121 | char *package |
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122 | PREINIT: |
123 | SV *sv = newSVpvn ("", 0); |
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124 | PPCODE: |
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125 | if (!sv) |
126 | croak ("Could not allocate ByteLoader buffers"); |
127 | filter_add(byteloader_filter, sv); |
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128 | |
129 | void |
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130 | unimport(package="ByteLoader", ...) |
131 | char *package |
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132 | PPCODE: |
133 | filter_del(byteloader_filter); |