static void open_bfile(oci8_svcctx_t *svcctx, oci8_lob_t *lob, OCIError *errhp)
{
while (1) {
sword rv = OCILobFileOpen_nb(svcctx, svcctx->base.hp.svc, errhp, lob->base.hp.lob, OCI_FILE_READONLY);
if (rv == OCI_ERROR && oci8_get_error_code(oci8_errhp) == 22290) {
/* ORA-22290: operation would exceed the maximum number of opened files or LOBs */
/* close all opened BFILE implicitly. */
oci8_base_t *base;
for (base = &lob->base; base != &lob->base; base = base->next) {
if (base->type == OCI_DTYPE_LOB) {
oci8_lob_t *tmp = (oci8_lob_t *)base;
if (tmp->state == S_BFILE_OPEN) {
chker2(OCILobFileClose_nb(svcctx, svcctx->base.hp.svc, oci8_errhp, tmp->base.hp.lob),
&svcctx->base);
tmp->state = S_BFILE_CLOSE;
}
}
}
} else {
chker2(rv, &svcctx->base);
lob->state = S_BFILE_OPEN;
return;
}
}
}
static VALUE oci8_lob_read(int argc, VALUE *argv, VALUE self)
{
oci8_lob_t *lob = DATA_PTR(self);
oci8_svcctx_t *svcctx = oci8_get_svcctx(lob->svc);
ub4 length;
ub4 nchar;
ub4 amt;
sword rv;
char buf[8192];
size_t buf_size_in_char;
VALUE size;
VALUE v = rb_ary_new();
rb_scan_args(argc, argv, "01", &size);
length = oci8_lob_get_length(lob);
if (length <= lob->pos) /* EOF */
return Qnil;
length -= lob->pos;
if (NIL_P(size)) {
nchar = length; /* read until EOF */
} else {
nchar = NUM2UINT(size);
if (nchar > length)
nchar = length;
}
amt = nchar;
buf_size_in_char = sizeof(buf) / lob->char_width;
do {
if (lob->state == S_BFILE_CLOSE) {
rv = OCILobFileOpen_nb(svcctx, svcctx->base.hp.svc, oci8_errhp, lob->base.hp.lob, OCI_FILE_READONLY);
if (rv == OCI_ERROR && oci8_get_error_code(oci8_errhp) == 22290) {
/* ORA-22290: operation would exceed the maximum number of opened files or LOBs */
/* close all opened BFILE implicitly. */
oci8_base_t *base;
for (base = &lob->base; base != &lob->base; base = base->next) {
if (base->type == OCI_DTYPE_LOB) {
oci8_lob_t *tmp = (oci8_lob_t *)base;
if (tmp->state == S_BFILE_OPEN) {
tmp->state = S_BFILE_CLOSE;
}
}
}
oci_lc(OCILobFileCloseAll_nb(svcctx, svcctx->base.hp.svc, oci8_errhp));
continue;
}
if (rv != OCI_SUCCESS)
oci8_raise(oci8_errhp, rv, NULL);
lob->state = S_BFILE_OPEN;
}
/* initialize buf in zeros everytime to check a nul characters. */
memset(buf, 0, sizeof(buf));
rv = OCILobRead_nb(svcctx, svcctx->base.hp.svc, oci8_errhp, lob->base.hp.lob, &amt, lob->pos + 1, buf, sizeof(buf), NULL, NULL, 0, lob->csfrm);
if (rv == OCI_ERROR && oci8_get_error_code(oci8_errhp) == 22289) {
/* ORA-22289: cannot perform FILEREAD operation on an unopened file or LOB */
if (lob->state == S_BFILE_CLOSE)
continue;
}
if (rv != OCI_SUCCESS && rv != OCI_NEED_DATA)
oci8_raise(oci8_errhp, rv, NULL);
/* Workaround when using Oracle 10.2.0.4 or 11.1.0.6 client and
* variable-length character set (e.g. AL32UTF8).
*
* When the above mentioned condition, amt may be shorter. So
* amt is increaded until a nul character to know the actually
* read size.
*/
while (amt < sizeof(buf) && buf[amt] != '\0') {
amt++;
}
if (amt == 0)
break;
/* for fixed size charset, amt is the number of characters stored in buf. */
if (amt > buf_size_in_char)
rb_raise(eOCIException, "Too large buffer fetched or you set too large size of a character.");
amt *= lob->char_width;
rb_ary_push(v, rb_str_new(buf, amt));
} while (rv == OCI_NEED_DATA);
lob->pos += nchar;
if (nchar == length) {
lob_close(lob);
bfile_close(lob);
}
if (RARRAY_LEN(v) == 0) {
return Qnil;
}
v = rb_ary_join(v, Qnil);
OBJ_TAINT(v);
if (lob->lobtype == OCI_TEMP_CLOB) {
/* set encoding */
rb_enc_associate(v, oci8_encoding);
return rb_str_conv_enc(v, oci8_encoding, rb_default_internal_encoding());
} else {
/* ASCII-8BIT */
return v;
}
}
