Commit | Line | Data |
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b295d113 TH |
1 | #include "EXTERN.h" |
2 | #include "perl.h" | |
3 | #include "XSUB.h" | |
e8edd1e6 | 4 | #include "byterun.h" |
b295d113 | 5 | |
059a8bb7 JH |
6 | /* Something arbitary for a buffer size */ |
7 | #define BYTELOADER_BUFFER 8096 | |
33c2a728 | 8 | |
059a8bb7 JH |
9 | int |
10 | bl_getc(struct byteloader_fdata *data) | |
33c2a728 GS |
11 | { |
12 | dTHX; | |
7c436af3 | 13 | if (SvCUR(data->datasv) <= (STRLEN)data->next_out) { |
059a8bb7 JH |
14 | int result; |
15 | /* Run out of buffered data, so attempt to read some more */ | |
16 | *(SvPV_nolen (data->datasv)) = '\0'; | |
17 | SvCUR_set (data->datasv, 0); | |
18 | data->next_out = 0; | |
19 | result = FILTER_READ (data->idx + 1, data->datasv, BYTELOADER_BUFFER); | |
20 | ||
21 | /* Filter returned error, or we got EOF and no data, then return EOF. | |
22 | Not sure if filter is allowed to return EOF and add data simultaneously | |
23 | Think not, but will bullet proof against it. */ | |
24 | if (result < 0 || SvCUR(data->datasv) == 0) | |
25 | return EOF; | |
26 | /* Else there must be at least one byte present, which is good enough */ | |
27 | } | |
28 | ||
1df34986 | 29 | return *((U8 *) SvPV_nolen (data->datasv) + data->next_out++); |
33c2a728 | 30 | } |
d8ab9aa2 | 31 | |
059a8bb7 JH |
32 | int |
33 | bl_read(struct byteloader_fdata *data, char *buf, size_t size, size_t n) | |
e8edd1e6 | 34 | { |
c5be433b | 35 | dTHX; |
059a8bb7 JH |
36 | char *start; |
37 | STRLEN len; | |
38 | size_t wanted = size * n; | |
39 | ||
40 | start = SvPV (data->datasv, len); | |
41 | if (len < (data->next_out + wanted)) { | |
42 | int result; | |
43 | ||
44 | /* Shuffle data to start of buffer */ | |
45 | len -= data->next_out; | |
46 | if (len) { | |
47 | memmove (start, start + data->next_out, len + 1); | |
48 | SvCUR_set (data->datasv, len); | |
49 | } else { | |
50 | *start = '\0'; /* Avoid call to memmove. */ | |
51 | SvCUR_set (data->datasv, 0); | |
52 | } | |
53 | data->next_out = 0; | |
54 | ||
55 | /* Attempt to read more data. */ | |
56 | do { | |
57 | result = FILTER_READ (data->idx + 1, data->datasv, BYTELOADER_BUFFER); | |
58 | ||
59 | start = SvPV (data->datasv, len); | |
60 | } while (result > 0 && len < wanted); | |
61 | /* Loop while not (EOF || error) and short reads */ | |
62 | ||
63 | /* If not enough data read, truncate copy */ | |
64 | if (wanted > len) | |
65 | wanted = len; | |
66 | } | |
67 | ||
68 | if (wanted > 0) { | |
69 | memcpy (buf, start + data->next_out, wanted); | |
70 | data->next_out += wanted; | |
71 | wanted /= size; | |
72 | } | |
73 | return (int) wanted; | |
e8edd1e6 | 74 | } |
b295d113 TH |
75 | |
76 | static I32 | |
acfe0abc | 77 | byteloader_filter(pTHX_ int idx, SV *buf_sv, int maxlen) |
b295d113 TH |
78 | { |
79 | OP *saveroot = PL_main_root; | |
80 | OP *savestart = PL_main_start; | |
059a8bb7 JH |
81 | struct byteloader_state bstate; |
82 | struct byteloader_fdata data; | |
1df34986 | 83 | int len; |
059a8bb7 JH |
84 | |
85 | data.next_out = 0; | |
86 | data.datasv = FILTER_DATA(idx); | |
87 | data.idx = idx; | |
b295d113 | 88 | |
059a8bb7 JH |
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; | |
e8edd1e6 | 94 | |
1df34986 AE |
95 | /* KLUDGE */ |
96 | if (byterun(aTHX_ &bstate) | |
97 | && (len = SvCUR(data.datasv) - (STRLEN)data.next_out)) | |
98 | { | |
99 | PerlIO_seek(PL_rsfp, -len, SEEK_CUR); | |
100 | PL_rsfp = NULL; | |
101 | } | |
102 | filter_del(byteloader_filter); | |
b295d113 TH |
103 | |
104 | if (PL_in_eval) { | |
105 | OP *o; | |
106 | ||
107 | PL_eval_start = PL_main_start; | |
108 | ||
109 | o = newSVOP(OP_CONST, 0, newSViv(1)); | |
110 | PL_eval_root = newLISTOP(OP_LINESEQ, 0, PL_main_root, o); | |
111 | PL_main_root->op_next = o; | |
112 | PL_eval_root = newUNOP(OP_LEAVEEVAL, 0, PL_eval_root); | |
113 | o->op_next = PL_eval_root; | |
114 | ||
115 | PL_main_root = saveroot; | |
116 | PL_main_start = savestart; | |
117 | } | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | MODULE = ByteLoader PACKAGE = ByteLoader | |
123 | ||
124 | PROTOTYPES: ENABLE | |
125 | ||
126 | void | |
c6c619a9 DM |
127 | import(package="ByteLoader", ...) |
128 | char *package | |
059a8bb7 JH |
129 | PREINIT: |
130 | SV *sv = newSVpvn ("", 0); | |
b295d113 | 131 | PPCODE: |
059a8bb7 JH |
132 | if (!sv) |
133 | croak ("Could not allocate ByteLoader buffers"); | |
134 | filter_add(byteloader_filter, sv); |