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Add mdb_find_row function

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This commit is contained in:
whydoubt
2005-03-07 04:28:12 +00:00
parent 3f79bc4884
commit 3153f5dd1e
6 changed files with 70 additions and 64 deletions
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42
src/libmdb/write.c
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@@ -593,7 +593,7 @@ guint16
mdb_add_row_to_pg(MdbTableDef *table, unsigned char *row_buffer, int new_row_size)
{
unsigned char *new_pg;
int num_rows, i, pos, row_start, row_end, row_size;
int num_rows, i, pos, row_start, row_size;
MdbCatalogEntry *entry = table->entry;
MdbHandle *mdb = entry->mdb;
MdbFormatConstants *fmt = mdb->fmt;
@@ -622,9 +622,7 @@ mdb_add_row_to_pg(MdbTableDef *table, unsigned char *row_buffer, int new_row_siz
/* copy existing rows */
for (i=0;i<num_rows;i++) {
row_start = mdb_pg_get_int16(mdb, (fmt->row_count_offset + 2) + (i*2));
row_end = mdb_find_end_of_row(mdb, i);
row_size = row_end - row_start + 1;
mdb_find_row(mdb, i, &row_start, &row_size);
pos -= row_size;
memcpy(&new_pg[pos], &mdb->pg_buf[row_start], row_size);
_mdb_put_int16(new_pg, (fmt->row_count_offset + 2) + (i*2), pos);
@@ -670,9 +668,8 @@ unsigned int num_fields;
fprintf(stderr, "File is not open for writing\n");
return 0;
}
row_start = mdb_pg_get_int16(mdb, (fmt->row_count_offset + 2) + ((table->cur_row-1)*2));
row_end = mdb_find_end_of_row(mdb, table->cur_row-1);
old_row_size = row_end - row_start;
mdb_find_row(mdb, table->cur_row-1, &row_start, &old_row_size);
row_end = row_start + old_row_size - 1;
row_start &= 0x0FFF; /* remove flags */
@@ -719,58 +716,55 @@ mdb_replace_row(MdbTableDef *table, int row, unsigned char *new_row, int new_row
{
MdbCatalogEntry *entry = table->entry;
MdbHandle *mdb = entry->mdb;
MdbFormatConstants *fmt = mdb->fmt;
int pg_size = mdb->fmt->pg_size;
int rco = mdb->fmt->row_count_offset;
unsigned char *new_pg;
guint16 num_rows;
int row_start, row_end, row_size;
int row_start, row_size;
int i, pos;
if (mdb_get_option(MDB_DEBUG_WRITE)) {
buffer_dump(mdb->pg_buf, 0, 39);
buffer_dump(mdb->pg_buf, fmt->pg_size - 160, fmt->pg_size-1);
buffer_dump(mdb->pg_buf, pg_size - 160, pg_size-1);
}
mdb_debug(MDB_DEBUG_WRITE,"updating row %d on page %lu", row, (unsigned long) table->cur_phys_pg);
new_pg = mdb_new_data_pg(entry);
num_rows = mdb_pg_get_int16(mdb, fmt->row_count_offset);
_mdb_put_int16(new_pg, fmt->row_count_offset, num_rows);
num_rows = mdb_pg_get_int16(mdb, rco);
_mdb_put_int16(new_pg, rco, num_rows);
pos = mdb->fmt->pg_size;
pos = pg_size;
/* rows before */
for (i=0;i<row;i++) {
row_start = mdb_pg_get_int16(mdb, (fmt->row_count_offset + 2) + (i*2));
row_end = mdb_find_end_of_row(mdb, i);
row_size = row_end - row_start + 1;
mdb_find_row(mdb, i, &row_start, &row_size);
pos -= row_size;
memcpy(&new_pg[pos], &mdb->pg_buf[row_start], row_size);
_mdb_put_int16(new_pg, (fmt->row_count_offset + 2) + (i*2), pos);
_mdb_put_int16(new_pg, rco + 2 + i*2, pos);
}
/* our row */
pos -= new_row_size;
memcpy(&new_pg[pos], new_row, new_row_size);
_mdb_put_int16(new_pg, (fmt->row_count_offset + 2) + (row*2), pos);
_mdb_put_int16(new_pg, rco + 2 + row*2, pos);
/* rows after */
for (i=row+1;i<num_rows;i++) {
row_start = mdb_pg_get_int16(mdb, (fmt->row_count_offset + 2) + (i*2));
row_end = mdb_find_end_of_row(mdb, i);
row_size = row_end - row_start + 1;
mdb_find_row(mdb, i, &row_start, &row_size);
pos -= row_size;
memcpy(&new_pg[pos], &mdb->pg_buf[row_start], row_size);
_mdb_put_int16(new_pg, (fmt->row_count_offset + 2) + (i*2), pos);
_mdb_put_int16(new_pg, rco + 2 + i*2, pos);
}
/* almost done, copy page over current */
memcpy(mdb->pg_buf, new_pg, fmt->pg_size);
memcpy(mdb->pg_buf, new_pg, pg_size);
g_free(new_pg);
_mdb_put_int16(mdb->pg_buf, 2, mdb_pg_get_freespace(mdb));
if (mdb_get_option(MDB_DEBUG_WRITE)) {
buffer_dump(mdb->pg_buf, 0, 39);
buffer_dump(mdb->pg_buf, fmt->pg_size - 160, fmt->pg_size-1);
buffer_dump(mdb->pg_buf, pg_size - 160, pg_size-1);
}
/* drum roll, please */
if (!mdb_write_pg(mdb, table->cur_phys_pg)) {