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6112853cda
Multiple tablespaces for InnoDB sql_table.cc: Tell explicitly that InnoDB should retrieve all columns in CHECKSUM TABLE sql_update.cc, sql_select.cc, my_base.h: More descriptive flag name HA_EXTRA_RETRIEVE_ALL_COLS
119 lines
2.3 KiB
C
119 lines
2.3 KiB
C
/**********************************************************************
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Utilities for converting data from the database file
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to the machine format.
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(c) 1995 Innobase Oy
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Created 11/28/1995 Heikki Tuuri
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***********************************************************************/
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#include "mach0data.h"
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#ifdef UNIV_NONINL
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#include "mach0data.ic"
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#endif
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/*************************************************************
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Reads a ulint in a compressed form if the log record fully contains it. */
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byte*
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mach_parse_compressed(
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/*==================*/
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/* out: pointer to end of the stored field, NULL if
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not complete */
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byte* ptr, /* in: pointer to buffer from where to read */
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byte* end_ptr,/* in: pointer to end of the buffer */
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ulint* val) /* out: read value (< 2^32) */
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{
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ulint flag;
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ut_ad(ptr && end_ptr && val);
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if (ptr >= end_ptr) {
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return(NULL);
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}
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flag = mach_read_from_1(ptr);
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if (flag < 0x80UL) {
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*val = flag;
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return(ptr + 1);
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} else if (flag < 0xC0UL) {
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if (end_ptr < ptr + 2) {
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return(NULL);
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}
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*val = mach_read_from_2(ptr) & 0x7FFFUL;
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return(ptr + 2);
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} else if (flag < 0xE0UL) {
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if (end_ptr < ptr + 3) {
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return(NULL);
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}
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*val = mach_read_from_3(ptr) & 0x3FFFFFUL;
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return(ptr + 3);
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} else if (flag < 0xF0UL) {
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if (end_ptr < ptr + 4) {
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return(NULL);
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}
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*val = mach_read_from_4(ptr) & 0x1FFFFFFFUL;
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return(ptr + 4);
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} else {
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ut_ad(flag == 0xF0UL);
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if (end_ptr < ptr + 5) {
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return(NULL);
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}
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*val = mach_read_from_4(ptr + 1);
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return(ptr + 5);
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}
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}
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/*************************************************************
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Reads a dulint in a compressed form if the log record fully contains it. */
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byte*
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mach_dulint_parse_compressed(
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/*=========================*/
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/* out: pointer to end of the stored field, NULL if
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not complete */
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byte* ptr, /* in: pointer to buffer from where to read */
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byte* end_ptr,/* in: pointer to end of the buffer */
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dulint* val) /* out: read value */
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{
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ulint high;
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ulint low;
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ulint size;
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ut_ad(ptr && end_ptr && val);
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if (end_ptr < ptr + 5) {
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return(NULL);
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}
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high = mach_read_compressed(ptr);
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size = mach_get_compressed_size(high);
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ptr += size;
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if (end_ptr < ptr + 4) {
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return(NULL);
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}
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low = mach_read_from_4(ptr);
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*val = ut_dulint_create(high, low);
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return(ptr + 4);
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}
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