lsm/mdbtools
1
0
Fork 0
mirror of https://github.com/mdbtools/mdbtools.git synced 2025-09-20 02:57:55 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

more gmdb2 work, reorged mdbhandle

Browse Source
This commit is contained in:
brianb
2003-01-01 22:29:39 +00:00
parent 3c0d61076d
commit cc362c42e9
28 changed files with 893 additions and 181 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
src/libmdb/data.c
View File

@@ -46,6 +46,7 @@ MdbColumn *col;
}
int mdb_find_end_of_row(MdbHandle *mdb, int row)
{
MdbFormatConstants *fmt = mdb->fmt;
int row_end;
/* Search the previous "row start" values for the first non-deleted one.
@@ -53,14 +54,14 @@ int row_end;
*/
#if 1
if (row==0) {
row_end = mdb->pg_size - 1;
row_end = fmt->pg_size - 1;
} else {
row_end = (mdb_get_int16(mdb, ((mdb->row_count_offset + 2) + (row - 1) * 2)) & 0x0FFF) - 1;
row_end = (mdb_get_int16(mdb, ((fmt->row_count_offset + 2) + (row - 1) * 2)) & 0x0FFF) - 1;
}
return row_end;
#else
for (i = row - 1; i >= 0; i--) {
row_start = mdb_get_int16(mdb, ((mdb->row_count_offset + 2) + i * 2));
row_start = mdb_get_int16(mdb, ((fmt->row_count_offset + 2) + i * 2));
if (!(row_start & 0x8000)) {
break;
}
@@ -68,7 +69,7 @@ int row_end;
row_start &= 0x0FFF;
if (i == -1) {
row_end = mdb->pg_size - 1;
row_end = fmt->pg_size - 1;
} else {
row_end = row_start - 1;
}
@@ -152,6 +153,7 @@ int ret;
int mdb_read_row(MdbTableDef *table, int row)
{
MdbHandle *mdb = table->entry->mdb;
MdbFormatConstants *fmt = mdb->fmt;
MdbColumn *col;
int i, j, rc;
int num_cols, var_cols, fixed_cols;
@@ -166,7 +168,7 @@ int col_ptr, deleted_columns=0;
unsigned char null_mask[33]; /* 256 columns max / 8 bits per byte */
unsigned char isnull;
row_start = mdb_get_int16(mdb, (mdb->row_count_offset + 2) + (row*2));
row_start = mdb_get_int16(mdb, (fmt->row_count_offset + 2) + (row*2));
row_end = mdb_find_end_of_row(mdb, row);
delflag = lookupflag = 0;
@@ -190,7 +192,7 @@ unsigned char isnull;
#endif
/* find out all the important stuff about the row */
if (mdb->jet_version==MDB_VER_JET4) {
if (IS_JET4(mdb)) {
num_cols = mdb_get_int16(mdb, row_start);
} else {
num_cols = mdb->pg_buf[row_start];
@@ -205,7 +207,7 @@ unsigned char isnull;
var_cols++;
}
bitmask_sz = (num_cols - 1) / 8 + 1;
if (mdb->jet_version==MDB_VER_JET4) {
if (IS_JET4(mdb)) {
eod = mdb_get_int16(mdb, row_end - 3 - var_cols*2 - bitmask_sz);
} else {
eod = mdb->pg_buf[row_end-1-var_cols-bitmask_sz];
@@ -219,7 +221,7 @@ unsigned char isnull;
num_cols, var_cols, eod);
#endif
if (mdb->jet_version==MDB_VER_JET4) {
if (IS_JET4(mdb)) {
col_start = 2;
} else {
/* data starts at 1 */
@@ -247,6 +249,7 @@ unsigned char isnull;
}
}
/* if fixed columns add up to more than 256, we need a jump */
if (col_start >= 256) {
num_of_jumps++;
jumps_used++;
@@ -254,11 +257,12 @@ unsigned char isnull;
}
col_start = row_start;
/* */
while (col_start+256 < row_end-bitmask_sz-1-var_cols-num_of_jumps){
col_start += 256;
num_of_jumps++;
}
if (mdb->jet_version==MDB_VER_JET4) {
if (IS_JET4(mdb)) {
col_ptr = row_end - 2 - bitmask_sz - 1;
eod = mdb_get_int16(mdb, col_ptr - var_cols*2);
col_start = mdb_get_int16(mdb, col_ptr);
@@ -298,7 +302,7 @@ unsigned char isnull;
if (var_cols_found==var_cols) {
len=eod - col_start;
} else {
if (mdb->jet_version==MDB_VER_JET4) {
if (IS_JET4(mdb)) {
//next_col = mdb_get_int16(mdb, row_end - bitmask_sz - var_cols_found * 2 - 2 - 1) ;
next_col = mdb->pg_buf[row_end - bitmask_sz - var_cols_found * 2 - 2] * 256 +
mdb->pg_buf[row_end - bitmask_sz - var_cols_found * 2 - 2 - 1] ;
@@ -398,12 +402,12 @@ unsigned char map_byte;
if (!map_pg) continue;
if(mdb_read_alt_pg(mdb, map_pg) != mdb->pg_size) {
if(mdb_read_alt_pg(mdb, map_pg) != mdb->fmt->pg_size) {
fprintf(stderr, "Oops! didn't get a full page at %d\n", map_pg);
exit(1);
}
//printf("reading page %ld\n",map_pg);
for (j=4;j<mdb->pg_size;j++) {
for (j=4;j<mdb->fmt->pg_size;j++) {
for (bitn=0;bitn<8;bitn++) {
if (mdb->alt_pg_buf[j] & 1 << bitn && pgnum > table->cur_phys_pg) {
table->cur_phys_pg = pgnum;
@@ -458,6 +462,7 @@ int mdb_rewind_table(MdbTableDef *table)
int mdb_fetch_row(MdbTableDef *table)
{
MdbHandle *mdb = table->entry->mdb;
MdbFormatConstants *fmt = mdb->fmt;
int rows;
int rc;
@@ -472,7 +477,7 @@ int rc;
}
do {
rows = mdb_get_int16(mdb,mdb->row_count_offset);
rows = mdb_get_int16(mdb,fmt->row_count_offset);
/* if at end of page, find a new page */
if (table->cur_row >= rows) {
@@ -559,7 +564,7 @@ guint16 len, cur;
#if MDB_DEBUG
printf("Reading LVAL page %06x\n", lval_pg);
#endif
if(mdb_read_alt_pg(mdb, lval_pg) != mdb->pg_size) {
if(mdb_read_alt_pg(mdb, lval_pg) != mdb->fmt->pg_size) {
/* Failed to read */
return 0;
}
@@ -568,7 +573,7 @@ guint16 len, cur;
if (ole_row) {
row_stop = mdb_get_int16(mdb, 10 + (ole_row - 1) * 2) & 0x0FFF;
} else {
row_stop = mdb->pg_size - 1;
row_stop = mdb->fmt->pg_size - 1;
}
row_start = mdb_get_int16(mdb, 10 + ole_row * 2);
#if MDB_DEBUG
@@ -589,14 +594,14 @@ guint16 len, cur;
mdb_swap_pgbuf(mdb);
cur=0;
do {
if(mdb_read_pg(mdb, lval_pg) != mdb->pg_size) {
if(mdb_read_pg(mdb, lval_pg) != mdb->fmt->pg_size) {
/* Failed to read */
return 0;
}
if (ole_row) {
row_stop = mdb_get_int16(mdb, 10 + (ole_row - 1) * 2) & 0x0FFF;
} else {
row_stop = mdb->pg_size - 1;
row_stop = mdb->fmt->pg_size - 1;
}
row_start = mdb_get_int16(mdb, 10 + ole_row * 2);
#if MDB_DEBUG
@@ -622,6 +627,7 @@ guint16 len, cur;
}
static char *mdb_memo_to_string(MdbHandle *mdb, int start, int size)
{
MdbFormatConstants *fmt = mdb->fmt;
guint16 memo_len;
static char text[MDB_BIND_SIZE];
guint16 memo_flags;
@@ -658,24 +664,24 @@ int i;
#if MDB_DEBUG
printf("Reading LVAL page %06x\n", lval_pg);
#endif
if(mdb_read_alt_pg(mdb, lval_pg) != mdb->pg_size) {
if(mdb_read_alt_pg(mdb, lval_pg) != fmt->pg_size) {
/* Failed to read */
return "";
}
/* swap the alt and regular page buffers, so we can call get_int16 */
mdb_swap_pgbuf(mdb);
if (memo_row) {
row_stop = mdb_get_int16(mdb, mdb->row_count_offset + 2 + (memo_row - 1) * 2) & 0x0FFF;
row_stop = mdb_get_int16(mdb, fmt->row_count_offset + 2 + (memo_row - 1) * 2) & 0x0FFF;
} else {
row_stop = mdb->pg_size - 1;
row_stop = fmt->pg_size - 1;
}
row_start = mdb_get_int16(mdb, mdb->row_count_offset + 2 + memo_row * 2);
row_start = mdb_get_int16(mdb, fmt->row_count_offset + 2 + memo_row * 2);
#if MDB_DEBUG
printf("row num %d row start %d row stop %d\n", memo_row, row_start, row_stop);
buffer_dump(mdb->pg_buf,row_start, row_start + len);
#endif
len = row_stop - row_start;
if (mdb->jet_version==MDB_VER_JET3) {
if (IS_JET3(mdb)) {
strncpy(text, &mdb->pg_buf[row_start], len);
text[len]='\0';
} else {
@@ -703,14 +709,14 @@ int i;
mdb_swap_pgbuf(mdb);
text[0]='\0';
do {
if(mdb_read_pg(mdb, lval_pg) != mdb->pg_size) {
if(mdb_read_pg(mdb, lval_pg) != fmt->pg_size) {
/* Failed to read */
return "";
}
if (memo_row) {
row_stop = mdb_get_int16(mdb, 10 + (memo_row - 1) * 2) & 0x0FFF;
} else {
row_stop = mdb->pg_size - 1;
row_stop = fmt->pg_size - 1;
}
row_start = mdb_get_int16(mdb, 10 + memo_row * 2);
#if MDB_DEBUG
@@ -812,7 +818,7 @@ int i,j;
if (size<0) {
return "";
}
if (mdb->jet_version==MDB_VER_JET4) {
if (IS_JET4(mdb)) {
/*
for (i=0;i<size;i++) {
fprintf(stdout, "%c %02x ", mdb->pg_buf[start+i], mdb->pg_buf[start+i]);