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more gmdb2 work, reorged mdbhandle

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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
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111
src/libmdb/file.c
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@@ -19,20 +19,35 @@
#include "mdbtools.h"
MdbFormatConstants MdbJet4Constants = {
4096, 0x0c, 12, 45, 47, 51, 55, 56, 63, 12, 15, 23, 5, 25
};
MdbFormatConstants MdbJet3Constants = {
2048, 0x08, 12, 25, 27, 31, 35, 36, 43, 8, 13, 16, 1, 18
};
static size_t _mdb_read_pg(MdbHandle *mdb, unsigned char *pg_buf, unsigned long pg);
MdbHandle *mdb_open(char *filename)
MdbHandle *_mdb_open(char *filename, gboolean writable)
{
MdbHandle *mdb;
int key[] = {0x86, 0xfb, 0xec, 0x37, 0x5d, 0x44, 0x9c, 0xfa, 0xc6, 0x5e, 0x28, 0xe6, 0x13, 0xb6};
int j,pos;
mdb = mdb_alloc_handle();
mdb->filename = (char *) malloc(strlen(filename)+1);
strcpy(mdb->filename, filename);
mdb->fd = open(filename,O_RDONLY);
/* need something to bootstrap with, reassign after page 0 is read */
mdb->fmt = &MdbJet3Constants;
mdb->f = mdb_alloc_file();
mdb->f->filename = (char *) malloc(strlen(filename)+1);
strcpy(mdb->f->filename, filename);
if (writable) {
mdb->f->writable = TRUE;
mdb->f->fd = open(filename,O_RDWR);
} else {
mdb->f->fd = open(filename,O_RDONLY);
}
if (mdb->fd==-1) {
if (mdb->f->fd==-1) {
/* fprintf(stderr,"Couldn't open file %s\n",filename); */
return NULL;
}
@@ -40,42 +55,16 @@ int j,pos;
fprintf(stderr,"Couldn't read first page.\n");
return NULL;
}
mdb->jet_version = mdb_get_int32(mdb, 0x14);
if (mdb->jet_version == MDB_VER_JET4) {
mdb->pg_size = 4096;
mdb->row_count_offset = 0x0c;
mdb->tab_num_rows_offset = 12;
mdb->tab_num_cols_offset = 45;
mdb->tab_num_idxs_offset = 47;
mdb->tab_num_ridxs_offset = 51;
mdb->tab_usage_map_offset = 55;
mdb->tab_first_dpg_offset = 56;
mdb->tab_cols_start_offset = 63;
mdb->tab_ridx_entry_size = 12;
mdb->col_fixed_offset = 15;
mdb->col_size_offset = 23;
mdb->col_num_offset = 5;
mdb->tab_col_entry_size = 25;
mdb->f->jet_version = mdb_get_int32(mdb, 0x14);
if (IS_JET4(mdb)) {
mdb->fmt = &MdbJet4Constants;
} else {
mdb->pg_size = 2048;
mdb->row_count_offset = 0x08;
mdb->tab_num_rows_offset = 12;
mdb->tab_num_cols_offset = 25;
mdb->tab_num_idxs_offset = 27;
mdb->tab_num_ridxs_offset = 31;
mdb->tab_usage_map_offset = 35;
mdb->tab_first_dpg_offset = 36;
mdb->tab_cols_start_offset = 43;
mdb->tab_ridx_entry_size = 8;
mdb->col_fixed_offset = 13;
mdb->col_size_offset = 16;
mdb->col_num_offset = 1;
mdb->tab_col_entry_size = 18;
mdb->fmt = &MdbJet3Constants;
}
/* get the db encryption key and xor it back to clear text */
mdb->db_key = mdb_get_int32(mdb, 0x3e);
mdb->db_key ^= 0xe15e01b9;
mdb->f->db_key = mdb_get_int32(mdb, 0x3e);
mdb->f->db_key ^= 0xe15e01b9;
/* get the db password located at 0x42 bytes into the file */
@@ -83,22 +72,22 @@ int j,pos;
j = mdb_get_int32(mdb,0x42+pos);
j ^= key[pos];
if ( j != 0)
mdb->db_passwd[pos] = j;
mdb->f->db_passwd[pos] = j;
else
mdb->db_passwd[pos] = '\0';
mdb->f->db_passwd[pos] = '\0';
}
return mdb;
}
MdbHandle *mdb_open(char *filename)
{
return _mdb_open(filename, FALSE);
}
void mdb_close(MdbHandle *mdb)
{
if (mdb->fd > 0) {
close(mdb->fd);
if (mdb->filename) {
free(mdb->filename);
mdb->filename = NULL;
}
if (mdb->f) {
mdb_free_file(mdb->f);
}
}
@@ -125,21 +114,21 @@ static size_t _mdb_read_pg(MdbHandle *mdb, unsigned char *pg_buf, unsigned long
{
size_t len;
struct stat status;
off_t offset = pg * mdb->pg_size;
off_t offset = pg * mdb->fmt->pg_size;
fstat(mdb->fd, &status);
fstat(mdb->f->fd, &status);
if (status.st_size < offset) {
fprintf(stderr,"offset %lu is beyond EOF\n",offset);
return 0;
}
lseek(mdb->fd, offset, SEEK_SET);
len = read(mdb->fd,pg_buf,mdb->pg_size);
lseek(mdb->f->fd, offset, SEEK_SET);
len = read(mdb->f->fd,pg_buf,mdb->fmt->pg_size);
if (len==-1) {
perror("read");
return 0;
}
else if (len<mdb->pg_size) {
/* fprintf(stderr,"EOF reached %d bytes returned.\n",len, mdb->pg_size); */
else if (len<mdb->fmt->pg_size) {
/* fprintf(stderr,"EOF reached %d bytes returned.\n",len, mdb->fmt->pg_size); */
return 0;
}
return len;
@@ -160,14 +149,18 @@ unsigned char c;
mdb->cur_pos++;
return c;
}
int _mdb_get_int16(unsigned char *buf, int offset)
{
return buf[offset+1]*256+buf[offset];
}
int mdb_get_int16(MdbHandle *mdb, int offset)
{
unsigned char *c;
int i;
if (offset < 0 || offset+2 > mdb->pg_size) return -1;
c = &mdb->pg_buf[offset];
i = c[1]*256+c[0];
if (offset < 0 || offset+2 > mdb->fmt->pg_size) return -1;
i = _mdb_get_int16(mdb->pg_buf, offset);
mdb->cur_pos+=2;
return i;
@@ -178,7 +171,7 @@ gint32 mdb_get_int24(MdbHandle *mdb, int offset)
gint32 l;
unsigned char *c;
if (offset <0 || offset+3 > mdb->pg_size) return -1;
if (offset <0 || offset+3 > mdb->fmt->pg_size) return -1;
c = &mdb->pg_buf[offset];
l =c[2]; l<<=8;
l+=c[1]; l<<=8;
@@ -204,7 +197,7 @@ long mdb_get_int32(MdbHandle *mdb, int offset)
{
long l;
if (offset <0 || offset+4 > mdb->pg_size) return -1;
if (offset <0 || offset+4 > mdb->fmt->pg_size) return -1;
l = _mdb_get_int32(mdb->pg_buf, offset);
mdb->cur_pos+=4;
@@ -216,7 +209,7 @@ float f, f2;
unsigned char *c;
int i;
if (offset <0 || offset+4 > mdb->pg_size) return -1;
if (offset <0 || offset+4 > mdb->fmt->pg_size) return -1;
memcpy(&f, &mdb->pg_buf[offset], 4);
@@ -237,7 +230,7 @@ double d, d2;
unsigned char *c;
int i;
if (offset <0 || offset+4 > mdb->pg_size) return -1;
if (offset <0 || offset+4 > mdb->fmt->pg_size) return -1;
memcpy(&d, &mdb->pg_buf[offset], 8);
@@ -254,7 +247,7 @@ int i;
}
int mdb_set_pos(MdbHandle *mdb, int pos)
{
if (pos<0 || pos >= mdb->pg_size) return 0;
if (pos<0 || pos >= mdb->fmt->pg_size) return 0;
mdb->cur_pos=pos;
return pos;