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https://github.com/mdbtools/mdbtools.git
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Rework of mdb_crack_row
This commit is contained in:
whydoubt
@@ -1,5 +1,6 @@
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Fri Feb 25 23:02:42 CST 2005 Jeff Smith <whydoubt@yahoo.com>
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Fri Feb 25 23:02:42 CST 2005 Jeff Smith <whydoubt@yahoo.com>
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* src/libmdb/money.c: Fix bad declaration
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* src/libmdb/money.c: Fix bad declaration
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* src/libmdb/write.c: Rework of mdb_crack_row
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Thu Feb 24 21:13:02 CST 2005 Jeff Smith <whydoubt@yahoo.com>
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Thu Feb 24 21:13:02 CST 2005 Jeff Smith <whydoubt@yahoo.com>
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* src/libmdb/data.c:
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* src/libmdb/data.c:
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@@ -105,110 +105,24 @@ mdb_is_col_indexed(MdbTableDef *table, int colnum)
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}
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}
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return 0;
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return 0;
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}
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}
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static int
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mdb_crack_row4(MdbTableDef *table, int row_start, int row_end, MdbField *fields)
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static void
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mdb_crack_row4(MdbHandle *mdb, int row_start, int row_end, unsigned int bitmask_sz, unsigned int row_var_cols, unsigned int *var_col_offsets)
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{
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{
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MdbCatalogEntry *entry = table->entry;
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MdbHandle *mdb = entry->mdb;
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MdbColumn *col;
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unsigned char *pg_buf = mdb->pg_buf;
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unsigned int i;
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unsigned int i;
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unsigned int row_var_cols=0, row_fixed_cols, row_cols;
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unsigned int fixed_cols_found;
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unsigned int col_start;
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unsigned char *nullmask;
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unsigned int bitmask_sz;
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unsigned int byte_num, bit_num;
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unsigned int *var_col_offsets = NULL;
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if (mdb_get_option(MDB_DEBUG_ROW)) {
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buffer_dump(pg_buf, row_start, row_end);
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}
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row_cols = mdb_pg_get_int16(mdb, row_start);
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bitmask_sz = (row_cols + 7) / 8;
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nullmask = &pg_buf[row_end - bitmask_sz + 1];
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/* read table of variable column locations */
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if (table->num_var_cols > 0) {
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row_var_cols = mdb_pg_get_int16(mdb, row_end - bitmask_sz - 1);
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var_col_offsets = (int *)g_malloc((row_var_cols+1)*sizeof(int));
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for (i=0; i<row_var_cols+1; i++) {
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for (i=0; i<row_var_cols+1; i++) {
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var_col_offsets[i] = mdb_pg_get_int16(mdb,
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var_col_offsets[i] = mdb_pg_get_int16(mdb,
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row_end - bitmask_sz - 3 - (i*2));
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row_end - bitmask_sz - 3 - (i*2));
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}
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}
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}
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}
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fixed_cols_found = 0;
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static void
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row_fixed_cols = row_cols - row_var_cols;
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mdb_crack_row3(MdbHandle *mdb, int row_start, int row_end, unsigned int bitmask_sz, unsigned int row_var_cols, unsigned int *var_col_offsets)
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/* read information into fields[] */
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for (i=0;i<table->num_cols;i++) {
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col = g_ptr_array_index(table->columns,i);
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fields[i].colnum = i;
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fields[i].is_fixed = (mdb_is_fixed_col(col)) ? 1 : 0;
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byte_num = col->col_num / 8;
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bit_num = col->col_num % 8;
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/* logic on nulls is reverse, 1 is not null, 0 is null */
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fields[i].is_null = nullmask[byte_num] & (1 << bit_num) ? 0 : 1;
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if ((fields[i].is_fixed)
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&& (fixed_cols_found < row_fixed_cols)) {
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col_start = col->fixed_offset + 2;
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fields[i].start = row_start + col_start;
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fields[i].value = &pg_buf[row_start + col_start];
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fields[i].siz = col->col_size;
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fixed_cols_found++;
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/* Use col->var_col_num because a deleted column is still
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* present in the variable column offsets table for the row */
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} else if ((!fields[i].is_fixed)
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&& (col->var_col_num < row_var_cols)) {
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col_start = var_col_offsets[col->var_col_num];
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fields[i].start = row_start + col_start;
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fields[i].value = &pg_buf[row_start + col_start];
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fields[i].siz = var_col_offsets[(col->var_col_num)+1] -
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col_start;
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} else {
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fields[i].start = 0;
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fields[i].value = NULL;
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fields[i].siz = 0;
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fields[i].is_null = 1;
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}
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}
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g_free(var_col_offsets);
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return row_cols;
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}
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static int
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mdb_crack_row3(MdbTableDef *table, int row_start, int row_end, MdbField *fields)
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{
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{
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MdbCatalogEntry *entry = table->entry;
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MdbHandle *mdb = entry->mdb;
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MdbColumn *col;
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unsigned char *pg_buf = mdb->pg_buf;
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unsigned int i;
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unsigned int i;
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unsigned int row_var_cols = 0, row_fixed_cols, row_cols;
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unsigned int fixed_cols_found, var_cols_found;
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unsigned int col_start;
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unsigned char *nullmask;
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unsigned int bitmask_sz;
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unsigned int byte_num, bit_num;
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unsigned int *var_col_offsets = NULL;
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unsigned int num_jumps = 0, jumps_used = 0;
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unsigned int num_jumps = 0, jumps_used = 0;
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unsigned int col_ptr, row_len;
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unsigned int col_ptr, row_len;
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if (mdb_get_option(MDB_DEBUG_ROW)) {
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buffer_dump(pg_buf, row_start, row_end);
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}
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row_cols = pg_buf[row_start];
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bitmask_sz = (row_cols + 7) / 8;
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nullmask = &pg_buf[row_end - bitmask_sz + 1];
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/* read table of variable column locations */
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if (table->num_var_cols > 0) {
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row_var_cols = pg_buf[row_end - bitmask_sz];
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row_len = row_end - row_start + 1;
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row_len = row_end - row_start + 1;
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num_jumps = (row_len - 1) / 256;
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num_jumps = (row_len - 1) / 256;
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col_ptr = row_end - bitmask_sz - num_jumps - 1;
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col_ptr = row_end - bitmask_sz - num_jumps - 1;
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@@ -216,62 +130,15 @@ mdb_crack_row3(MdbTableDef *table, int row_start, int row_end, MdbField *fields)
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if ((col_ptr-row_start-row_var_cols)/256 < num_jumps)
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if ((col_ptr-row_start-row_var_cols)/256 < num_jumps)
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num_jumps--;
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num_jumps--;
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var_col_offsets = (int *)g_malloc((row_var_cols+1)*sizeof(int));
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jumps_used = 0;
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jumps_used = 0;
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for (i=0; i<row_var_cols+1; i++) {
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for (i=0; i<row_var_cols+1; i++) {
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if ((jumps_used < num_jumps)
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if ((jumps_used < num_jumps)
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&& (i == pg_buf[row_end-bitmask_sz-jumps_used-1])) {
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&& (i == mdb->pg_buf[row_end-bitmask_sz-jumps_used-1])) {
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jumps_used++;
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jumps_used++;
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}
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}
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var_col_offsets[i] = pg_buf[col_ptr-i]+(jumps_used*256);
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var_col_offsets[i] = mdb->pg_buf[col_ptr-i]+(jumps_used*256);
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}
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}
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}
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}
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fixed_cols_found = 0;
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var_cols_found = 0;
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row_fixed_cols = row_cols - row_var_cols;
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if (mdb_get_option(MDB_DEBUG_ROW)) {
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fprintf(stdout,"bitmask_sz %d num_jumps %d\n",bitmask_sz, num_jumps);
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fprintf(stdout,"row_var_cols %d\n", row_var_cols);
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fprintf(stdout,"row_fixed_cols %d\n", row_fixed_cols);
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}
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/* read information into fields[] */
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for (i=0;i<table->num_cols;i++) {
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col = g_ptr_array_index (table->columns, i);
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fields[i].colnum = i;
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fields[i].is_fixed = (mdb_is_fixed_col(col)) ? 1 : 0;
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byte_num = col->col_num / 8;
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bit_num = col->col_num % 8;
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/* logic on nulls is reverse, 1 is not null, 0 is null */
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fields[i].is_null = nullmask[byte_num] & (1 << bit_num) ? 0 : 1;
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if ((fields[i].is_fixed)
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&& (fixed_cols_found < row_fixed_cols)) {
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col_start = col->fixed_offset + 1;
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fields[i].start = row_start + col_start;
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fields[i].value = &pg_buf[row_start + col_start];
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fields[i].siz = col->col_size;
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fixed_cols_found++;
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} else if ((!fields[i].is_fixed)
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&& (var_cols_found < row_var_cols)) {
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col_start = var_col_offsets[var_cols_found];
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fields[i].start = row_start + col_start;
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fields[i].value = &pg_buf[row_start + col_start];
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fields[i].siz = var_col_offsets[var_cols_found+1] -
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col_start;
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var_cols_found++;
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} else {
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fields[i].start = 0;
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fields[i].value = NULL;
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fields[i].siz = 0;
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fields[i].is_null = 1;
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}
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}
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g_free(var_col_offsets);
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return row_cols;
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}
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/**
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/**
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* mdb_crack_row:
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* mdb_crack_row:
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* @table: Table that the row belongs to
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* @table: Table that the row belongs to
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@@ -296,14 +163,94 @@ mdb_crack_row3(MdbTableDef *table, int row_start, int row_end, MdbField *fields)
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int
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int
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mdb_crack_row(MdbTableDef *table, int row_start, int row_end, MdbField *fields)
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mdb_crack_row(MdbTableDef *table, int row_start, int row_end, MdbField *fields)
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{
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{
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MdbColumn *col;
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MdbCatalogEntry *entry = table->entry;
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MdbCatalogEntry *entry = table->entry;
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MdbHandle *mdb = entry->mdb;
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MdbHandle *mdb = entry->mdb;
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unsigned char *pg_buf = mdb->pg_buf;
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unsigned int row_var_cols=0, row_cols;
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unsigned char *nullmask;
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unsigned int bitmask_sz;
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unsigned int *var_col_offsets = NULL;
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unsigned int fixed_cols_found, row_fixed_cols;
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unsigned int col_count_size;
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unsigned int i;
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if (mdb_get_option(MDB_DEBUG_ROW)) {
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buffer_dump(pg_buf, row_start, row_end);
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}
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if (IS_JET4(mdb)) {
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if (IS_JET4(mdb)) {
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return mdb_crack_row4(table, row_start, row_end, fields);
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row_cols = mdb_pg_get_int16(mdb, row_start);
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col_count_size = 2;
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} else {
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} else {
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return mdb_crack_row3(table, row_start, row_end, fields);
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row_cols = pg_buf[row_start];
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col_count_size = 1;
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}
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}
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bitmask_sz = (row_cols + 7) / 8;
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nullmask = &pg_buf[row_end - bitmask_sz + 1];
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/* read table of variable column locations */
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row_var_cols = IS_JET4(mdb) ?
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mdb_pg_get_int16(mdb, row_end - bitmask_sz - 1) :
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pg_buf[row_end - bitmask_sz];
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var_col_offsets = (unsigned int *)g_malloc((row_var_cols+1)*sizeof(int));
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if (table->num_var_cols > 0) {
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if (IS_JET4(mdb)) {
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mdb_crack_row4(mdb, row_start, row_end, bitmask_sz,
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row_var_cols, var_col_offsets);
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} else {
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mdb_crack_row3(mdb, row_start, row_end, bitmask_sz,
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row_var_cols, var_col_offsets);
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}
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}
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fixed_cols_found = 0;
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row_fixed_cols = row_cols - row_var_cols;
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if (mdb_get_option(MDB_DEBUG_ROW)) {
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fprintf(stdout,"bitmask_sz %d\n", bitmask_sz);
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fprintf(stdout,"row_var_cols %d\n", row_var_cols);
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fprintf(stdout,"row_fixed_cols %d\n", row_fixed_cols);
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}
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for (i=0;i<table->num_cols;i++) {
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unsigned int byte_num, bit_num;
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unsigned int col_start;
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col = g_ptr_array_index(table->columns,i);
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fields[i].colnum = i;
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fields[i].is_fixed = (mdb_is_fixed_col(col)) ? 1 : 0;
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byte_num = col->col_num / 8;
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bit_num = col->col_num % 8;
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/* logic on nulls is reverse, 1 is not null, 0 is null */
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fields[i].is_null = nullmask[byte_num] & (1 << bit_num) ? 0 : 1;
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if ((fields[i].is_fixed)
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&& (fixed_cols_found < row_fixed_cols)) {
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col_start = col->fixed_offset + col_count_size;
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fields[i].start = row_start + col_start;
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fields[i].value = &pg_buf[row_start + col_start];
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fields[i].siz = col->col_size;
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fixed_cols_found++;
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/* Use col->var_col_num because a deleted column is still
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* present in the variable column offsets table for the row */
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} else if ((!fields[i].is_fixed)
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&& (col->var_col_num < row_var_cols)) {
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col_start = var_col_offsets[col->var_col_num];
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fields[i].start = row_start + col_start;
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fields[i].value = &pg_buf[row_start + col_start];
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fields[i].siz = var_col_offsets[(col->var_col_num)+1] -
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col_start;
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} else {
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fields[i].start = 0;
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fields[i].value = NULL;
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fields[i].siz = 0;
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fields[i].is_null = 1;
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}
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}
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g_free(var_col_offsets);
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return row_cols;
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}
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}
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static int
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static int
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