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root |
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#include "EXTERN.h" |
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#include "perl.h" |
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#include "XSUB.h" |
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#include "byterun.h" |
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/* Something arbitary for a buffer size */ |
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#define BYTELOADER_BUFFER 8096 |
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int |
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bl_getc(struct byteloader_fdata *data) |
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{ |
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dTHX; |
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if (SvCUR(data->datasv) <= (STRLEN)data->next_out) { |
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int result; |
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/* Run out of buffered data, so attempt to read some more */ |
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*(SvPV_nolen (data->datasv)) = '\0'; |
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SvCUR_set (data->datasv, 0); |
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data->next_out = 0; |
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result = FILTER_READ (data->idx + 1, data->datasv, BYTELOADER_BUFFER); |
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/* Filter returned error, or we got EOF and no data, then return EOF. |
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Not sure if filter is allowed to return EOF and add data simultaneously |
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Think not, but will bullet proof against it. */ |
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if (result < 0 || SvCUR(data->datasv) == 0) |
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return EOF; |
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/* Else there must be at least one byte present, which is good enough */ |
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} |
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return *((U8 *) SvPV_nolen (data->datasv) + data->next_out++); |
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} |
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int |
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bl_read(struct byteloader_fdata *data, char *buf, size_t size, size_t n) |
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{ |
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dTHX; |
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char *start; |
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STRLEN len; |
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size_t wanted = size * n; |
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start = SvPV (data->datasv, len); |
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if (len < (data->next_out + wanted)) { |
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int result; |
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/* Shuffle data to start of buffer */ |
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len -= data->next_out; |
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if (len) { |
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memmove (start, start + data->next_out, len + 1); |
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SvCUR_set (data->datasv, len); |
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} else { |
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*start = '\0'; /* Avoid call to memmove. */ |
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SvCUR_set (data->datasv, 0); |
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} |
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data->next_out = 0; |
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/* Attempt to read more data. */ |
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do { |
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result = FILTER_READ (data->idx + 1, data->datasv, BYTELOADER_BUFFER); |
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start = SvPV (data->datasv, len); |
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} while (result > 0 && len < wanted); |
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/* Loop while not (EOF || error) and short reads */ |
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/* If not enough data read, truncate copy */ |
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if (wanted > len) |
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wanted = len; |
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} |
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if (wanted > 0) { |
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memcpy (buf, start + data->next_out, wanted); |
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data->next_out += wanted; |
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wanted /= size; |
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} |
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return (int) wanted; |
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} |
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static I32 |
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byteloader_filter(pTHX_ int idx, SV *buf_sv, int maxlen) |
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{ |
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OP *saveroot = PL_main_root; |
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OP *savestart = PL_main_start; |
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struct byteloader_state bstate; |
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struct byteloader_fdata data; |
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int len; |
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data.next_out = 0; |
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data.datasv = FILTER_DATA(idx); |
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data.idx = idx; |
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bstate.bs_fdata = &data; |
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bstate.bs_obj_list = Null(void**); |
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bstate.bs_obj_list_fill = -1; |
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bstate.bs_sv = Nullsv; |
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bstate.bs_iv_overflows = 0; |
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/* KLUDGE */ |
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if (byterun(aTHX_ &bstate) |
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&& (len = SvCUR(data.datasv) - (STRLEN)data.next_out)) |
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{ |
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PerlIO_seek(PL_rsfp, -len, SEEK_CUR); |
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PL_rsfp = NULL; |
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} |
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filter_del(byteloader_filter); |
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if (PL_in_eval) { |
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OP *o; |
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PL_eval_start = PL_main_start; |
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o = newSVOP(OP_CONST, 0, newSViv(1)); |
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PL_eval_root = newLISTOP(OP_LINESEQ, 0, PL_main_root, o); |
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PL_main_root->op_next = o; |
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PL_eval_root = newUNOP(OP_LEAVEEVAL, 0, PL_eval_root); |
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o->op_next = PL_eval_root; |
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PL_main_root = saveroot; |
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PL_main_start = savestart; |
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} |
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return 0; |
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} |
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MODULE = ByteLoader PACKAGE = ByteLoader |
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PROTOTYPES: ENABLE |
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void |
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import(package="ByteLoader", ...) |
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char *package |
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PREINIT: |
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SV *sv = newSVpvn ("", 0); |
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PPCODE: |
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if (!sv) |
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croak ("Could not allocate ByteLoader buffers"); |
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filter_add(byteloader_filter, sv); |
