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Patches from Brent Johnson for double, off page memo, and big endian support

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This commit is contained in:
brianb
2000-08-09 03:04:57 +00:00
parent e05970d711
commit 62dc667342
16 changed files with 315 additions and 86 deletions
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45
src/libmdb/file.c
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@@ -19,6 +19,8 @@
#include "mdbtools.h"
static size_t _mdb_read_pg(MdbHandle *mdb, unsigned char *pg_buf, unsigned long pg);
MdbHandle *mdb_open(char *filename)
{
MdbHandle *mdb;
@@ -68,6 +70,22 @@ int j,pos;
*/
size_t mdb_read_pg(MdbHandle *mdb, unsigned long pg)
{
size_t len;
len = _mdb_read_pg(mdb, mdb->pg_buf, pg);
/* kan - reset the cur_pos on a new page read */
mdb->cur_pos = 0; /* kan */
return len;
}
size_t mdb_read_alt_pg(MdbHandle *mdb, unsigned long pg)
{
size_t len;
len = _mdb_read_pg(mdb, mdb->alt_pg_buf, pg);
return len;
}
static size_t _mdb_read_pg(MdbHandle *mdb, unsigned char *pg_buf, unsigned long pg)
{
size_t len;
struct stat status;
off_t offset = pg * mdb->pg_size;
@@ -78,7 +96,7 @@ off_t offset = pg * mdb->pg_size;
return 0;
}
lseek(mdb->fd, offset, SEEK_SET);
len = read(mdb->fd,mdb->pg_buf,mdb->pg_size);
len = read(mdb->fd,pg_buf,mdb->pg_size);
if (len==-1) {
perror("read");
return 0;
@@ -86,9 +104,7 @@ off_t offset = pg * mdb->pg_size;
else if (len<mdb->pg_size) {
/* fprintf(stderr,"EOF reached.\n"); */
return 0;
}
/* kan - reset the cur_pos on a new page read */
mdb->cur_pos = 0; /* kan */
}
return len;
}
int mdb_get_int16(MdbHandle *mdb, int offset)
@@ -119,6 +135,27 @@ unsigned char *c;
mdb->cur_pos+=4;
return l;
}
double mdb_get_double(MdbHandle *mdb, int offset)
{
double d, d2;
unsigned char *c;
int i;
if (offset <0 || offset+4 > mdb->pg_size) return -1;
memcpy(&d, &mdb->pg_buf[offset], 8);
#ifdef HW_BIG_ENDIAN
d2 = d;
for (i=0; i<sizeof(d); i++) {
*(((unsigned char *)&d)+i) =
*(((unsigned char *)&d2)+sizeof(d)-1-i);
}
#endif
mdb->cur_pos+=8;
return d;
}
int mdb_set_pos(MdbHandle *mdb, int pos)
{
if (pos<0 || pos >= mdb->pg_size) return 0;