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mdbtools/src/libmdb/data.c
James Woodcock 42996dad65 Send error message to stderr
2020-11-01 12:56:38 +00:00

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/* MDB Tools - A library for reading MS Access database file
* Copyright (C) 2000 Brian Bruns
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define _XOPEN_SOURCE
#include <time.h>
#include <math.h>
#include "mdbtools.h"
#define OFFSET_MASK 0x1fff
#define OLE_BUFFER_SIZE (MDB_BIND_SIZE*64)
char *mdb_money_to_string(MdbHandle *mdb, int start);
char *mdb_numeric_to_string(MdbHandle *mdb, int start, int prec, int scale);
static int _mdb_attempt_bind(MdbHandle *mdb,
MdbColumn *col, unsigned char isnull, int offset, int len);
static char *mdb_date_to_string(MdbHandle *mdb, const char *fmt, void *buf, int start);
#ifdef MDB_COPY_OLE
static size_t mdb_copy_ole(MdbHandle *mdb, void *dest, int start, int size);
#endif
static const int noleap_cal[] = {0,31,59,90,120,151,181,212,243,273,304,334,365};
static const int leap_cal[] = {0,31,60,91,121,152,182,213,244,274,305,335,366};
/* Some databases (eg PostgreSQL) do not understand integer 0/1 values
* as TRUE/FALSE, so provide a means to override the values used to be
* the SQL Standard TRUE/FALSE values.
*/
static const char boolean_false_number[] = "0";
static const char boolean_true_number[] = "1";
static const char boolean_false_word[] = "FALSE";
static const char boolean_true_word[] = "TRUE";
void mdb_set_bind_size(MdbHandle *mdb, size_t bind_size) {
mdb->bind_size = bind_size;
}
void mdb_set_date_fmt(MdbHandle *mdb, const char *fmt)
{
snprintf(mdb->date_fmt, sizeof(mdb->date_fmt), "%s", fmt);
}
void mdb_set_shortdate_fmt(MdbHandle *mdb, const char *fmt)
{
snprintf(mdb->shortdate_fmt, sizeof(mdb->shortdate_fmt), "%s", fmt);
}
void mdb_set_boolean_fmt_numbers(MdbHandle *mdb)
{
mdb->boolean_false_value = boolean_false_number;
mdb->boolean_true_value = boolean_true_number;
}
void mdb_set_boolean_fmt_words(MdbHandle *mdb)
{
mdb->boolean_false_value = boolean_false_word;
mdb->boolean_true_value = boolean_true_word;
}
int mdb_bind_column(MdbTableDef *table, int col_num, void *bind_ptr, int *len_ptr)
{
MdbColumn *col = NULL;
/*
** the column arrary is 0 based, so decrement to get 1 based parameter
*/
col_num--;
if (col_num >= 0 && col_num < (int)table->num_cols) {
col=g_ptr_array_index(table->columns, col_num);
if (col) {
if (bind_ptr)
col->bind_ptr = bind_ptr;
if (len_ptr)
col->len_ptr = len_ptr;
return col_num + 1;
}
}
return -1;
}
int
mdb_bind_column_by_name(MdbTableDef *table, gchar *col_name, void *bind_ptr, int *len_ptr)
{
unsigned int i;
int col_num = -1;
MdbColumn *col;
for (i=0;i<table->num_cols;i++) {
col=g_ptr_array_index(table->columns,i);
if (!g_ascii_strcasecmp(col->name,col_name)) {
col_num = i + 1;
if (bind_ptr)
col->bind_ptr = bind_ptr;
if (len_ptr)
col->len_ptr = len_ptr;
break;
}
}
return col_num;
}
/**
* mdb_find_pg_row
* @mdb: Database file handle
* @pg_row: Lower byte contains the row number, the upper three contain page
* @buf: Pointer for returning a pointer to the page
* @off: Pointer for returning an offset to the row
* @len: Pointer for returning the length of the row
*
* Returns: 0 on success. -1 on failure.
*/
int mdb_find_pg_row(MdbHandle *mdb, int pg_row, void **buf, int *off, size_t *len)
{
unsigned int pg = pg_row >> 8;
unsigned int row = pg_row & 0xff;
int result = 0;
if (mdb_read_alt_pg(mdb, pg) != mdb->fmt->pg_size)
return -1;
mdb_swap_pgbuf(mdb);
result = mdb_find_row(mdb, row, off, len);
mdb_swap_pgbuf(mdb);
*off &= OFFSET_MASK;
*buf = mdb->alt_pg_buf;
return result;
}
int mdb_find_row(MdbHandle *mdb, int row, int *start, size_t *len)
{
int rco = mdb->fmt->row_count_offset;
int next_start;
if (row > 1000) return -1;
*start = mdb_get_int16(mdb->pg_buf, rco + 2 + row*2);
next_start = (row == 0) ? mdb->fmt->pg_size :
mdb_get_int16(mdb->pg_buf, rco + row*2) & OFFSET_MASK;
*len = next_start - (*start & OFFSET_MASK);
if ((*start & OFFSET_MASK) >= mdb->fmt->pg_size ||
(*start & OFFSET_MASK) > next_start ||
next_start > mdb->fmt->pg_size)
return -1;
return 0;
}
int
mdb_find_end_of_row(MdbHandle *mdb, int row)
{
int rco = mdb->fmt->row_count_offset;
int row_end;
#if 1
if (row > 1000) return -1;
row_end = (row == 0) ? mdb->fmt->pg_size :
mdb_get_int16(mdb->pg_buf, rco + row*2) & OFFSET_MASK;
#else
/* Search the previous "row start" values for the first non-'lookupflag'
* one. If we don't find one, then the end of the page is the correct
* value.
*/
int i, row_start;
if (row > 1000) return -1;
/* if lookupflag is not set, it's good (deleteflag is ok) */
for (i = row; i > 0; i--) {
row_start = mdb_get_int16(mdb->pg_buf, (rco + i*2));
if (!(row_start & 0x8000)) {
break;
}
}
row_end = (i == 0) ? mdb->fmt->pg_size : row_start & OFFSET_MASK;
#endif
return row_end - 1;
}
int mdb_is_null(unsigned char *null_mask, int col_num)
{
int byte_num = (col_num - 1) / 8;
int bit_num = (col_num - 1) % 8;
if ((1 << bit_num) & null_mask[byte_num]) {
return 0;
} else {
return 1;
}
}
/* bool has to be handled specially because it uses the null bit to store its
** value*/
static size_t
mdb_xfer_bound_bool(MdbHandle *mdb, MdbColumn *col, int value)
{
col->cur_value_len = value;
if (col->bind_ptr) {
strcpy(col->bind_ptr,
value ? mdb->boolean_false_value : mdb->boolean_true_value);
}
if (col->len_ptr) {
*col->len_ptr = strlen(col->bind_ptr);
}
return 1;
}
static size_t
mdb_xfer_bound_ole(MdbHandle *mdb, int start, MdbColumn *col, int len)
{
size_t ret = 0;
if (len) {
col->cur_value_start = start;
col->cur_value_len = len;
} else {
col->cur_value_start = 0;
col->cur_value_len = 0;
}
#ifdef MDB_COPY_OLE
if (col->bind_ptr || col->len_ptr) {
ret = mdb_copy_ole(mdb, col->bind_ptr, start, len);
}
#else
if (col->bind_ptr) {
memcpy(col->bind_ptr, mdb->pg_buf + start, MDB_MEMO_OVERHEAD);
}
ret = MDB_MEMO_OVERHEAD;
#endif
if (col->len_ptr) {
*col->len_ptr = ret;
}
return ret;
}
static size_t
mdb_xfer_bound_data(MdbHandle *mdb, int start, MdbColumn *col, int len)
{
int ret;
//if (!strcmp("Name",col->name)) {
//printf("start %d %d\n",start, len);
//}
if (len) {
col->cur_value_start = start;
col->cur_value_len = len;
} else {
col->cur_value_start = 0;
col->cur_value_len = 0;
}
if (col->bind_ptr) {
if (!len) {
strcpy(col->bind_ptr, "");
} else {
//fprintf(stdout,"len %d size %d\n",len, col->col_size);
char *str;
if (col->col_type == MDB_NUMERIC) {
str = mdb_numeric_to_string(mdb, start, col->col_scale, col->col_prec);
} else if (col->col_type == MDB_DATETIME) {
if (mdb_col_is_shortdate(col)) {
str = mdb_date_to_string(mdb, mdb->shortdate_fmt, mdb->pg_buf, start);
} else {
str = mdb_date_to_string(mdb, mdb->date_fmt, mdb->pg_buf, start);
}
} else {
str = mdb_col_to_string(mdb, mdb->pg_buf, start, col->col_type, len);
}
snprintf(col->bind_ptr, mdb->bind_size, "%s", str);
g_free(str);
}
ret = strlen(col->bind_ptr);
if (col->len_ptr) {
*col->len_ptr = ret;
}
return ret;
}
return 0;
}
int mdb_read_row(MdbTableDef *table, unsigned int row)
{
MdbHandle *mdb = table->entry->mdb;
MdbColumn *col;
unsigned int i;
int row_start;
size_t row_size;
int delflag, lookupflag;
MdbField fields[256];
int num_fields;
if (table->num_rows == 0)
return 0;
if (mdb_find_row(mdb, row, &row_start, &row_size)) {
fprintf(stderr, "warning: mdb_find_row failed.\n");
return 0;
}
if (row_size == 0) {
fprintf(stderr, "warning: row_size = 0.\n");
return 0;
}
delflag = lookupflag = 0;
if (row_start & 0x8000) lookupflag++;
if (row_start & 0x4000) delflag++;
row_start &= OFFSET_MASK; /* remove flags */
#if MDB_DEBUG
fprintf(stdout,"Row %d bytes %d to %d %s %s\n",
row, row_start, row_start + row_size - 1,
lookupflag ? "[lookup]" : "",
delflag ? "[delflag]" : "");
#endif
if (!table->noskip_del && delflag) {
return 0;
}
num_fields = mdb_crack_row(table, row_start, row_size, fields);
if (num_fields < 0)
return 0;
if (!mdb_test_sargs(table, fields, num_fields)) return 0;
#if MDB_DEBUG
fprintf(stdout,"sarg test passed row %d \n", row);
#endif
#if MDB_DEBUG
mdb_buffer_dump(mdb->pg_buf, row_start, row_size);
#endif
/* take advantage of mdb_crack_row() to clean up binding */
/* use num_cols instead of num_fields -- bsb 03/04/02 */
for (i = 0; i < table->num_cols; i++) {
col = g_ptr_array_index(table->columns,fields[i].colnum);
_mdb_attempt_bind(mdb, col, fields[i].is_null,
fields[i].start, fields[i].siz);
}
return 1;
}
static int _mdb_attempt_bind(MdbHandle *mdb,
MdbColumn *col,
unsigned char isnull,
int offset,
int len)
{
if (col->col_type == MDB_BOOL) {
mdb_xfer_bound_bool(mdb, col, isnull);
} else if (isnull) {
mdb_xfer_bound_data(mdb, 0, col, 0);
} else if (col->col_type == MDB_OLE) {
mdb_xfer_bound_ole(mdb, offset, col, len);
} else {
//if (!mdb_test_sargs(mdb, col, offset, len)) {
//return 0;
//}
mdb_xfer_bound_data(mdb, offset, col, len);
}
return 1;
}
/* Read next data page into mdb->pg_buf */
int mdb_read_next_dpg(MdbTableDef *table)
{
MdbCatalogEntry *entry = table->entry;
MdbHandle *mdb = entry->mdb;
int next_pg;
#ifndef SLOW_READ
while (1) {
next_pg = mdb_map_find_next(mdb, table->usage_map,
table->map_sz, table->cur_phys_pg);
if (next_pg < 0)
break; /* unknow map type: goto fallback */
if (!next_pg)
return 0;
if (!mdb_read_pg(mdb, next_pg)) {
fprintf(stderr, "error: reading page %d failed.\n", next_pg);
return 0;
}
table->cur_phys_pg = next_pg;
if (mdb->pg_buf[0]==MDB_PAGE_DATA && mdb_get_int32(mdb->pg_buf, 4)==(long)entry->table_pg)
return table->cur_phys_pg;
/* On rare occasion, mdb_map_find_next will return a wrong page */
/* Found in a big file, over 4,000,000 records */
fprintf(stderr,
"warning: page %d from map doesn't match: Type=%d, buf[4..7]=%ld Expected table_pg=%ld\n",
next_pg, mdb->pg_buf[0], mdb_get_int32(mdb->pg_buf, 4), entry->table_pg);
}
fprintf(stderr, "Warning: defaulting to brute force read\n");
#endif
/* can't do a fast read, go back to the old way */
do {
if (!mdb_read_pg(mdb, table->cur_phys_pg++))
return 0;
} while (mdb->pg_buf[0]!=MDB_PAGE_DATA || mdb_get_int32(mdb->pg_buf, 4)!=(long)entry->table_pg);
/* fprintf(stderr,"returning new page %ld\n", table->cur_phys_pg); */
return table->cur_phys_pg;
}
int mdb_rewind_table(MdbTableDef *table)
{
table->cur_pg_num=0;
table->cur_phys_pg=0;
table->cur_row=0;
return 0;
}
int
mdb_fetch_row(MdbTableDef *table)
{
MdbHandle *mdb = table->entry->mdb;
MdbFormatConstants *fmt = mdb->fmt;
unsigned int rows;
int rc;
guint32 pg;
if (table->num_rows==0)
return 0;
/* initialize */
if (!table->cur_pg_num) {
table->cur_pg_num=1;
table->cur_row=0;
if ((!table->is_temp_table)&&(table->strategy!=MDB_INDEX_SCAN))
if (!mdb_read_next_dpg(table)) return 0;
}
do {
if (table->is_temp_table) {
GPtrArray *pages = table->temp_table_pages;
rows = mdb_get_int16(
g_ptr_array_index(pages, table->cur_pg_num-1),
fmt->row_count_offset);
if (table->cur_row >= rows) {
table->cur_row = 0;
if (++table->cur_pg_num > (unsigned int)pages->len)
return 0;
}
memcpy(mdb->pg_buf,
g_ptr_array_index(pages, table->cur_pg_num-1),
fmt->pg_size);
} else if (table->strategy==MDB_INDEX_SCAN) {
if (!mdb_index_find_next(table->mdbidx, table->scan_idx, table->chain, &pg, (guint16 *) &(table->cur_row))) {
mdb_index_scan_free(table);
return 0;
}
mdb_read_pg(mdb, pg);
} else {
rows = mdb_get_int16(mdb->pg_buf,fmt->row_count_offset);
/* if at end of page, find a new data page */
if (table->cur_row >= rows) {
table->cur_row=0;
if (!mdb_read_next_dpg(table)) {
return 0;
}
}
}
/* printf("page %d row %d\n",table->cur_phys_pg, table->cur_row); */
rc = mdb_read_row(table, table->cur_row);
table->cur_row++;
} while (!rc);
return 1;
}
void mdb_data_dump(MdbTableDef *table)
{
unsigned int i;
int ret;
char *bound_values[MDB_MAX_COLS];
for (i=0;i<table->num_cols;i++) {
bound_values[i] = (char *) g_malloc(256);
ret = mdb_bind_column(table, i+1, bound_values[i], NULL);
if (ret == -1) {
fprintf(stderr, "error binding column %d\n", i+1);
g_free(bound_values[i]);
bound_values[i] = NULL;
}
}
mdb_rewind_table(table);
while (mdb_fetch_row(table)) {
for (i=0;i<table->num_cols;i++) {
if (bound_values[i]) {
fprintf(stdout, "column %d is %s\n", i+1, bound_values[i]);
}
}
}
for (i=0;i<table->num_cols;i++) {
g_free(bound_values[i]);
}
}
int mdb_is_fixed_col(MdbColumn *col)
{
return col->is_fixed;
}
#if 0
static char *mdb_data_to_hex(MdbHandle *mdb, char *text, int start, int size)
{
int i;
for (i=start; i<start+size; i++) {
sprintf(&text[(i-start)*2],"%02x", mdb->pg_buf[i]);
}
text[(i-start)*2]='\0';
return text;
}
#endif
/*
* ole_ptr should point to the original blob value of the field.
* If omited, there will be no multi-page check to that the caller is
* responsible for not calling this function. Then, it doesn't have to
* preserve the original value.
*/
size_t
mdb_ole_read_next(MdbHandle *mdb, MdbColumn *col, void *ole_ptr)
{
guint32 ole_len;
void *buf;
int row_start;
size_t len;
if (ole_ptr) {
ole_len = mdb_get_int32(ole_ptr, 0);
mdb_debug(MDB_DEBUG_OLE,"ole len = %d ole flags = %02x",
ole_len & 0x00ffffff, ole_len >> 24);
if ((ole_len & 0x80000000)
|| (ole_len & 0x40000000))
/* inline or single-page fields don't have a next */
return 0;
}
mdb_debug(MDB_DEBUG_OLE, "pg_row %d", col->cur_blob_pg_row);
if (!col->cur_blob_pg_row)
return 0; /* we are done */
if (mdb_find_pg_row(mdb, col->cur_blob_pg_row,
&buf, &row_start, &len)) {
return 0;
}
if (len < 4)
return 0;
mdb_debug(MDB_DEBUG_OLE,"start %d len %d", row_start, len);
if (col->bind_ptr)
memcpy(col->bind_ptr, (char*)buf + row_start + 4, len - 4);
col->cur_blob_pg_row = mdb_get_int32(buf, row_start);
return len - 4;
}
size_t
mdb_ole_read(MdbHandle *mdb, MdbColumn *col, void *ole_ptr, size_t chunk_size)
{
guint32 ole_len;
void *buf;
int row_start;
size_t len;
ole_len = mdb_get_int32(ole_ptr, 0);
mdb_debug(MDB_DEBUG_OLE,"ole len = %d ole flags = %02x",
ole_len & 0x00ffffff, ole_len >> 24);
col->chunk_size = chunk_size;
if (ole_len & 0x80000000) {
/* inline ole field, if we can satisfy it, then do it */
len = col->cur_value_len - MDB_MEMO_OVERHEAD;
if (chunk_size < len)
return 0;
if (col->bind_ptr)
memcpy(col->bind_ptr, &mdb->pg_buf[col->cur_value_start +
MDB_MEMO_OVERHEAD], len);
return len;
} else if (ole_len & 0x40000000) {
col->cur_blob_pg_row = mdb_get_int32(ole_ptr, 4);
mdb_debug(MDB_DEBUG_OLE,"ole row = %d ole pg = %ld",
col->cur_blob_pg_row & 0xff,
col->cur_blob_pg_row >> 8);
if (mdb_find_pg_row(mdb, col->cur_blob_pg_row,
&buf, &row_start, &len)) {
return 0;
}
mdb_debug(MDB_DEBUG_OLE,"start %d len %d", row_start, len);
if (col->bind_ptr) {
memcpy(col->bind_ptr, (char*)buf + row_start, len);
if (mdb_get_option(MDB_DEBUG_OLE))
mdb_buffer_dump(col->bind_ptr, 0, 16);
}
return len;
} else if ((ole_len & 0xf0000000) == 0) {
col->cur_blob_pg_row = mdb_get_int32(ole_ptr, 4);
mdb_debug(MDB_DEBUG_OLE,"ole row = %d ole pg = %ld",
col->cur_blob_pg_row & 0xff,
col->cur_blob_pg_row >> 8);
if (mdb_find_pg_row(mdb, col->cur_blob_pg_row,
&buf, &row_start, &len) || len < 4) {
return 0;
}
mdb_debug(MDB_DEBUG_OLE,"start %d len %d", row_start, len);
if (col->bind_ptr)
memcpy(col->bind_ptr, (char*)buf + row_start + 4, len - 4);
col->cur_blob_pg_row = mdb_get_int32(buf, row_start);
mdb_debug(MDB_DEBUG_OLE, "next pg_row %d", col->cur_blob_pg_row);
return len - 4;
} else {
fprintf(stderr,"Unhandled ole field flags = %02x\n", ole_len >> 24);
return 0;
}
}
/*
* mdb_ole_read_full calls mdb_ole_read then loop over mdb_ole_read_next as much as necessary.
* returns the result in a big buffer.
* The call must free it.
* Note that this function is not idempotent: It may be called only once per column after each bind.
*/
void*
mdb_ole_read_full(MdbHandle *mdb, MdbColumn *col, size_t *size)
{
char ole_ptr[MDB_MEMO_OVERHEAD];
char *result = malloc(OLE_BUFFER_SIZE);
size_t result_buffer_size = OLE_BUFFER_SIZE;
size_t len, pos;
memcpy(ole_ptr, col->bind_ptr, MDB_MEMO_OVERHEAD);
len = mdb_ole_read(mdb, col, ole_ptr, OLE_BUFFER_SIZE);
memcpy(result, col->bind_ptr, len);
pos = len;
while ((len = mdb_ole_read_next(mdb, col, ole_ptr))) {
if (pos+len >= result_buffer_size) {
result_buffer_size += OLE_BUFFER_SIZE;
result = realloc(result, result_buffer_size);
}
memcpy(result + pos, col->bind_ptr, len);
pos += len;
}
if (size)
*size = pos;
return result;
}
#ifdef MDB_COPY_OLE
static size_t mdb_copy_ole(MdbHandle *mdb, void *dest, int start, int size)
{
guint32 ole_len;
gint32 row_start, pg_row;
size_t len;
void *buf, *pg_buf = mdb->pg_buf;
if (size<MDB_MEMO_OVERHEAD) {
return 0;
}
/* The 16 bit integer at offset 0 is the length of the memo field.
* The 32 bit integer at offset 4 contains page and row information.
*/
ole_len = mdb_get_int32(pg_buf, start);
if (ole_len & 0x80000000) {
/* inline */
len = size - MDB_MEMO_OVERHEAD;
if (dest) memcpy(dest, pg_buf + start + MDB_MEMO_OVERHEAD, len);
return len;
} else if (ole_len & 0x40000000) {
/* single page */
pg_row = mdb_get_int32(pg_buf, start+4);
mdb_debug(MDB_DEBUG_OLE,"Reading LVAL page %06x", pg_row >> 8);
if (mdb_find_pg_row(mdb, pg_row, &buf, &row_start, &len)) {
return 0;
}
mdb_debug(MDB_DEBUG_OLE,"row num %d start %d len %d",
pg_row & 0xff, row_start, len);
if (dest)
memcpy(dest, buf + row_start, len);
return len;
} else if ((ole_len & 0xff000000) == 0) { // assume all flags in MSB
/* multi-page */
int cur = 0;
pg_row = mdb_get_int32(pg_buf, start+4);
do {
mdb_debug(MDB_DEBUG_OLE,"Reading LVAL page %06x",
pg_row >> 8);
if (mdb_find_pg_row(mdb,pg_row,&buf,&row_start,&len) || len < 4) {
return 0;
}
mdb_debug(MDB_DEBUG_OLE,"row num %d start %d len %d",
pg_row & 0xff, row_start, len);
if (dest)
memcpy(dest+cur, buf + row_start + 4, len - 4);
cur += len - 4;
/* find next lval page */
pg_row = mdb_get_int32(buf, row_start);
} while ((pg_row >> 8));
return cur;
} else {
fprintf(stderr, "Unhandled ole field flags = %02x\n", ole_len >> 24);
return 0;
}
}
#endif
static char *mdb_memo_to_string(MdbHandle *mdb, int start, int size)
{
guint32 memo_len;
gint32 row_start, pg_row;
size_t len;
void *buf, *pg_buf = mdb->pg_buf;
char *text = (char *) g_malloc(mdb->bind_size);
if (size<MDB_MEMO_OVERHEAD) {
strcpy(text, "");
return text;
}
#if MDB_DEBUG
mdb_buffer_dump(pg_buf, start, MDB_MEMO_OVERHEAD);
#endif
/* The 32 bit integer at offset 0 is the length of the memo field
* with some flags in the high bits.
* The 32 bit integer at offset 4 contains page and row information.
*/
memo_len = mdb_get_int32(pg_buf, start);
if (memo_len & 0x80000000) {
/* inline memo field */
mdb_unicode2ascii(mdb, (char*)pg_buf + start + MDB_MEMO_OVERHEAD,
size - MDB_MEMO_OVERHEAD, text, mdb->bind_size);
return text;
} else if (memo_len & 0x40000000) {
/* single-page memo field */
pg_row = mdb_get_int32(pg_buf, start+4);
#if MDB_DEBUG
printf("Reading LVAL page %06x\n", pg_row >> 8);
#endif
if (mdb_find_pg_row(mdb, pg_row, &buf, &row_start, &len)) {
strcpy(text, "");
return text;
}
#if MDB_DEBUG
printf("row num %d start %d len %d\n",
pg_row & 0xff, row_start, len);
mdb_buffer_dump(buf, row_start, len);
#endif
mdb_unicode2ascii(mdb, (char*)buf + row_start, len, text, mdb->bind_size);
return text;
} else if ((memo_len & 0xff000000) == 0) { // assume all flags in MSB
/* multi-page memo field */
guint32 tmpoff = 0;
char *tmp;
tmp = (char *) g_malloc(memo_len);
pg_row = mdb_get_int32(pg_buf, start+4);
do {
#if MDB_DEBUG
printf("Reading LVAL page %06x\n", pg_row >> 8);
#endif
if (mdb_find_pg_row(mdb,pg_row,&buf,&row_start,&len)) {
g_free(tmp);
strcpy(text, "");
return text;
}
#if MDB_DEBUG
printf("row num %d start %d len %d\n",
pg_row & 0xff, row_start, len);
#endif
if (tmpoff + len - 4 > memo_len)
break;
/* Stop processing on zero length multiple page memo fields */
if (len < 4)
break;
memcpy(tmp + tmpoff, (char*)buf + row_start + 4, len - 4);
tmpoff += len - 4;
} while (( pg_row = mdb_get_int32(buf, row_start) ));
if (tmpoff < memo_len) {
fprintf(stderr, "Warning: incorrect memo length\n");
}
mdb_unicode2ascii(mdb, tmp, tmpoff, text, mdb->bind_size);
g_free(tmp);
return text;
} else {
fprintf(stderr, "Unhandled memo field flags = %02x\n", memo_len >> 24);
strcpy(text, "");
return text;
}
}
#if 0
static int trim_trailing_zeros(char * buff)
{
char *p;
int n = strlen(buff);
/* Don't need to trim strings with no decimal portion */
if(!strchr(buff,'.'))
return 0;
/* Trim the zeros */
p = buff + n - 1;
while (p >= buff && *p == '0')
*p-- = '\0';
/* If a decimal sign is left at the end, remove it too */
if (*p == '.')
*p = '\0';
return 0;
}
#endif
/* Date/Time is stored as a double, where the whole
part is the days from 12/30/1899 and the fractional
part is the fractional part of one day. */
void
mdb_tm_to_date(struct tm *t, double *td)
{
short yr = t->tm_year + 1900;
char leap = ((yr & 3) == 0) && ((yr % 100) != 0 || (yr % 400) == 0);
const int *cal = leap ? leap_cal : noleap_cal;
long int time = (yr*365+(yr/4)-(yr/100)+(yr/400)+cal[t->tm_mon]+t->tm_mday)-693959;
*td = (((long)t->tm_hour * 3600)+((long)t->tm_min * 60)+((long)t->tm_sec)) / 86400.0;
if (time>=0) *td+=time; else *td=time-*td;
}
void
mdb_date_to_tm(double td, struct tm *t)
{
long int day, time;
int yr, q;
const int *cal;
day = (long int)(td);
time = (long int)(fabs(td - day) * 86400.0 + 0.5);
t->tm_hour = time / 3600;
t->tm_min = (time / 60) % 60;
t->tm_sec = time % 60;
t->tm_year = 1 - 1900;
day += 693593; /* Days from 1/1/1 to 12/31/1899 */
t->tm_wday = (day+1) % 7;
q = day / 146097; /* 146097 days in 400 years */
t->tm_year += 400 * q;
day -= q * 146097;
q = day / 36524; /* 36524 days in 100 years */
if (q > 3) q = 3;
t->tm_year += 100 * q;
day -= q * 36524;
q = day / 1461; /* 1461 days in 4 years */
t->tm_year += 4 * q;
day -= q * 1461;
q = day / 365; /* 365 days in 1 year */
if (q > 3) q = 3;
t->tm_year += q;
day -= q * 365;
yr = t->tm_year + 1900;
cal = ((yr)%4==0 && ((yr)%100!=0 || (yr)%400==0)) ?
leap_cal : noleap_cal;
for (t->tm_mon=0; t->tm_mon<12; t->tm_mon++) {
if (day < cal[t->tm_mon+1]) break;
}
t->tm_mday = day - cal[t->tm_mon] + 1;
t->tm_yday = day;
t->tm_isdst = -1;
}
static char *
mdb_date_to_string(MdbHandle *mdb, const char *fmt, void *buf, int start)
{
struct tm t;
char *text = (char *) g_malloc(mdb->bind_size);
double td = mdb_get_double(buf, start);
mdb_date_to_tm(td, &t);
strftime(text, mdb->bind_size, mdb->date_fmt, &t);
return text;
}
char *mdb_uuid_to_string(const void *buf, int pos)
{
const unsigned char *kkd = (const unsigned char *)buf;
return g_strdup_printf("{%02X%02X%02X%02X" "-" "%02X%02X" "-" "%02X%02X"
"-" "%02X%02X" "%02X%02X%02X%02X%02X%02X}",
kkd[pos+3], kkd[pos+2], kkd[pos+1], kkd[pos], // little-endian
kkd[pos+5], kkd[pos+4], // little-endian
kkd[pos+7], kkd[pos+6], // little-endian
kkd[pos+8], kkd[pos+9], // big-endian
kkd[pos+10], kkd[pos+11],
kkd[pos+12], kkd[pos+13],
kkd[pos+14], kkd[pos+15]); // big-endian
}
#if 0
int floor_log10(double f, int is_single)
{
unsigned int i;
double y = 10.0;
if (f < 0.0)
f = -f;
if ((f == 0.0) || (f == 1.0) || isinf(f)) {
return 0;
} else if (f < 1.0) {
if (is_single) {
/* The intermediate value p is necessary to prevent
* promotion of the comparison to type double */
float p;
for (i=1; (p = f * y) < 1.0; i++)
y *= 10.0;
} else {
for (i=1; f * y < 1.0; i++)
y *= 10.0;
}
return -(int)i;
} else { /* (x > 1.0) */
for (i=0; f >= y; i++)
y *= 10.0;
return (int)i;
}
}
#endif
char *mdb_col_to_string(MdbHandle *mdb, void *buf, int start, int datatype, int size)
{
char *text = NULL;
float tf;
double td;
switch (datatype) {
case MDB_BOOL:
/* shouldn't happen. bools are handled specially
** by mdb_xfer_bound_bool() */
break;
case MDB_BYTE:
text = g_strdup_printf("%d", mdb_get_byte(buf, start));
break;
case MDB_INT:
text = g_strdup_printf("%hd",
(short)mdb_get_int16(buf, start));
break;
case MDB_LONGINT:
case MDB_COMPLEX:
text = g_strdup_printf("%ld",
mdb_get_int32(buf, start));
break;
case MDB_FLOAT:
tf = mdb_get_single(buf, start);
text = g_strdup_printf("%.8e", tf);
break;
case MDB_DOUBLE:
td = mdb_get_double(buf, start);
text = g_strdup_printf("%.16e", td);
break;
case MDB_BINARY:
if (size<0) {
text = g_strdup("");
} else {
text = g_malloc(size);
memcpy(text, (char*)buf+start, size);
}
break;
case MDB_TEXT:
if (size<0) {
text = g_strdup("");
} else {
text = (char *) g_malloc(mdb->bind_size);
mdb_unicode2ascii(mdb, (char*)buf + start,
size, text, mdb->bind_size);
}
break;
case MDB_DATETIME:
text = mdb_date_to_string(mdb, mdb->date_fmt, buf, start);
break;
case MDB_MEMO:
text = mdb_memo_to_string(mdb, start, size);
break;
case MDB_MONEY:
text = mdb_money_to_string(mdb, start);
case MDB_NUMERIC:
break;
case MDB_REPID:
text = mdb_uuid_to_string(mdb->pg_buf, start);
break;
default:
text = g_strdup("");
break;
}
return text;
}
int mdb_col_disp_size(MdbColumn *col)
{
switch (col->col_type) {
case MDB_BOOL:
return 1;
break;
case MDB_BYTE:
return 4;
break;
case MDB_INT:
return 6;
break;
case MDB_LONGINT:
case MDB_COMPLEX:
return 11;
break;
case MDB_FLOAT:
return 10;
break;
case MDB_DOUBLE:
return 10;
break;
case MDB_TEXT:
return col->col_size;
break;
case MDB_DATETIME:
return 20;
break;
case MDB_MEMO:
return 64000;
break;
case MDB_MONEY:
return 21;
break;
}
return 0;
}
int mdb_col_fixed_size(MdbColumn *col)
{
switch (col->col_type) {
case MDB_BOOL:
return 1;
break;
case MDB_BYTE:
return -1;
break;
case MDB_INT:
return 2;
break;
case MDB_LONGINT:
case MDB_COMPLEX:
return 4;
break;
case MDB_FLOAT:
return 4;
break;
case MDB_DOUBLE:
return 8;
break;
case MDB_TEXT:
return -1;
break;
case MDB_DATETIME:
return 4;
break;
case MDB_BINARY:
return -1;
break;
case MDB_MEMO:
return -1;
break;
case MDB_MONEY:
return 8;
break;
}
return 0;
}
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