byte*
row_upd_parse_sys_vals(
/*===================*/
/* out: log data end or NULL */
byte* ptr, /* in: buffer */
byte* end_ptr,/* in: buffer end */
ulint* pos, /* out: TRX_ID position in record */
dulint* trx_id, /* out: trx id */
dulint* roll_ptr)/* out: roll ptr */
{
ptr = mach_parse_compressed(ptr, end_ptr, pos);
if (ptr == NULL) {
return(NULL);
}
if (end_ptr < ptr + DATA_ROLL_PTR_LEN) {
return(NULL);
}
*roll_ptr = trx_read_roll_ptr(ptr);
ptr += DATA_ROLL_PTR_LEN;
ptr = mach_dulint_parse_compressed(ptr, end_ptr, trx_id);
return(ptr);
}
byte*
mlog_parse_initial_log_record(
/*==========================*/
/* out: parsed record end, NULL if not a complete
record */
byte* ptr, /* in: buffer */
byte* end_ptr,/* in: buffer end */
byte* type, /* out: log record type: MLOG_1BYTE, ... */
ulint* space, /* out: space id */
ulint* page_no)/* out: page number */
{
if (end_ptr < ptr + 1) {
return(NULL);
}
*type = (byte)((ulint)*ptr & ~MLOG_SINGLE_REC_FLAG);
ut_ad(*type <= MLOG_BIGGEST_TYPE);
ptr++;
if (end_ptr < ptr + 2) {
return(NULL);
}
ptr = mach_parse_compressed(ptr, end_ptr, space);
if (ptr == NULL) {
return(NULL);
}
ptr = mach_parse_compressed(ptr, end_ptr, page_no);
return(ptr);
}
byte*
trx_undo_parse_page_init(
/*======================*/
/* out: end of log record or NULL */
byte* ptr, /* in: buffer */
byte* end_ptr,/* in: buffer end */
page_t* page, /* in: page or NULL */
mtr_t* mtr) /* in: mtr or NULL */
{
ulint type;
ptr = mach_parse_compressed(ptr, end_ptr, &type);
if (ptr == NULL) {
return(NULL);
}
if (page) {
trx_undo_page_init(page, type, mtr);
}
return(ptr);
}
/********************************************************//**
Parses a log record written by mlog_write_ulint or mlog_write_dulint.
@return parsed record end, NULL if not a complete record or a corrupt record */
UNIV_INTERN
byte*
mlog_parse_nbytes(
/*==============*/
ulint type, /*!< in: log record type: MLOG_1BYTE, ... */
byte* ptr, /*!< in: buffer */
byte* end_ptr,/*!< in: buffer end */
byte* page, /*!< in: page where to apply the log record, or NULL */
void* page_zip)/*!< in/out: compressed page, or NULL */
{
ulint offset;
ulint val;
dulint dval;
ut_a(type <= MLOG_8BYTES);
ut_a(!page || !page_zip || fil_page_get_type(page) != FIL_PAGE_INDEX);
if (end_ptr < ptr + 2) {
return(NULL);
}
offset = mach_read_from_2(ptr);
ptr += 2;
if (offset >= UNIV_PAGE_SIZE) {
recv_sys->found_corrupt_log = TRUE;
return(NULL);
}
if (type == MLOG_8BYTES) {
ptr = mach_dulint_parse_compressed(ptr, end_ptr, &dval);
if (ptr == NULL) {
return(NULL);
}
if (page) {
if (UNIV_LIKELY_NULL(page_zip)) {
mach_write_to_8
(((page_zip_des_t*) page_zip)->data
+ offset, dval);
}
mach_write_to_8(page + offset, dval);
}
return(ptr);
}
ptr = mach_parse_compressed(ptr, end_ptr, &val);
if (ptr == NULL) {
return(NULL);
}
switch (type) {
case MLOG_1BYTE:
if (UNIV_UNLIKELY(val > 0xFFUL)) {
goto corrupt;
}
if (page) {
if (UNIV_LIKELY_NULL(page_zip)) {
mach_write_to_1
(((page_zip_des_t*) page_zip)->data
+ offset, val);
}
mach_write_to_1(page + offset, val);
}
break;
case MLOG_2BYTES:
if (UNIV_UNLIKELY(val > 0xFFFFUL)) {
goto corrupt;
}
if (page) {
if (UNIV_LIKELY_NULL(page_zip)) {
mach_write_to_2
(((page_zip_des_t*) page_zip)->data
+ offset, val);
}
mach_write_to_2(page + offset, val);
}
break;
case MLOG_4BYTES:
if (page) {
if (UNIV_LIKELY_NULL(page_zip)) {
mach_write_to_4
(((page_zip_des_t*) page_zip)->data
+ offset, val);
}
mach_write_to_4(page + offset, val);
}
break;
default:
corrupt:
recv_sys->found_corrupt_log = TRUE;
ptr = NULL;
}
return(ptr);
}
byte*
row_upd_index_parse(
/*================*/
/* out: log data end or NULL */
byte* ptr, /* in: buffer */
byte* end_ptr,/* in: buffer end */
mem_heap_t* heap, /* in: memory heap where update vector is
built */
upd_t** update_out)/* out: update vector */
{
upd_t* update;
upd_field_t* upd_field;
dfield_t* new_val;
ulint len;
ulint n_fields;
byte* buf;
ulint info_bits;
ulint i;
if (end_ptr < ptr + 1) {
return(NULL);
}
info_bits = mach_read_from_1(ptr);
ptr++;
ptr = mach_parse_compressed(ptr, end_ptr, &n_fields);
if (ptr == NULL) {
return(NULL);
}
update = upd_create(n_fields, heap);
update->info_bits = info_bits;
for (i = 0; i < n_fields; i++) {
upd_field = upd_get_nth_field(update, i);
new_val = &(upd_field->new_val);
ptr = mach_parse_compressed(ptr, end_ptr,
&(upd_field->field_no));
if (ptr == NULL) {
return(NULL);
}
ptr = mach_parse_compressed(ptr, end_ptr, &len);
if (ptr == NULL) {
return(NULL);
}
new_val->len = len;
if (len != UNIV_SQL_NULL) {
if (end_ptr < ptr + len) {
return(NULL);
} else {
buf = mem_heap_alloc(heap, len);
ut_memcpy(buf, ptr, len);
ptr += len;
new_val->data = buf;
}
}
}
*update_out = update;
return(ptr);
}
byte*
mlog_parse_nbytes(
/*==============*/
/* out: parsed record end, NULL if not a complete
record or a corrupt record */
ulint type, /* in: log record type: MLOG_1BYTE, ... */
byte* ptr, /* in: buffer */
byte* end_ptr,/* in: buffer end */
byte* page) /* in: page where to apply the log record, or NULL */
{
ulint offset;
ulint val;
dulint dval;
ut_a(type <= MLOG_8BYTES);
if (end_ptr < ptr + 2) {
return(NULL);
}
offset = mach_read_from_2(ptr);
ptr += 2;
if (offset >= UNIV_PAGE_SIZE) {
recv_sys->found_corrupt_log = TRUE;
return(NULL);
}
if (type == MLOG_8BYTES) {
ptr = mach_dulint_parse_compressed(ptr, end_ptr, &dval);
if (ptr == NULL) {
return(NULL);
}
if (page) {
mach_write_to_8(page + offset, dval);
}
return(ptr);
}
ptr = mach_parse_compressed(ptr, end_ptr, &val);
if (ptr == NULL) {
return(NULL);
}
if (type == MLOG_1BYTE) {
if (val > 0xFFUL) {
recv_sys->found_corrupt_log = TRUE;
return(NULL);
}
} else if (type == MLOG_2BYTES) {
if (val > 0xFFFFUL) {
recv_sys->found_corrupt_log = TRUE;
return(NULL);
}
} else {
if (type != MLOG_4BYTES) {
recv_sys->found_corrupt_log = TRUE;
return(NULL);
}
}
if (page) {
if (type == MLOG_1BYTE) {
mach_write_to_1(page + offset, val);
} else if (type == MLOG_2BYTES) {
mach_write_to_2(page + offset, val);
} else {
ut_a(type == MLOG_4BYTES);
mach_write_to_4(page + offset, val);
}
}
return(ptr);
}
