// read directory info out of
// pandalog file
void read_dir(void) {
assert (thePandalog->file != NULL);
assert(in_read_mode());
PlHeader *plh = read_header();
thePandalog->chunk.size = plh->chunk_size * SLACK_MULT;
thePandalog->chunk.zsize = plh->chunk_size * SLACK_MULT;
// realloc those chunk bufs
thePandalog->chunk.buf = (unsigned char *)
realloc(thePandalog->chunk.buf, thePandalog->chunk.size);
thePandalog->chunk.buf_p = thePandalog->chunk.buf;
thePandalog->chunk.zbuf = (unsigned char *)
realloc(thePandalog->chunk.zbuf, thePandalog->chunk.zsize);
fseek(thePandalog->file, plh->dir_pos, SEEK_SET);
uint32_t nc;
int n = fread(&(nc), 1, sizeof(nc), thePandalog->file);
assert (n == sizeof(nc));
PandalogDir *dir = &(thePandalog->dir);
dir->max_chunks = nc;
dir->instr = (uint64_t *) malloc(sizeof(uint64_t) * nc);
dir->pos = (uint64_t *) malloc(sizeof(uint64_t) * (1+nc));
dir->num_entries = (uint64_t *) malloc(sizeof(uint64_t) * nc);
uint32_t i;
for (i=0; i<nc; i++) {
int n = fread(&(dir->instr[i]), 1, sizeof(dir->instr[i]), thePandalog->file);
assert (n == sizeof(dir->instr[i]));
n = fread(&(dir->pos[i]), 1, sizeof(dir->pos[i]), thePandalog->file);
assert (n == sizeof(dir->pos[i]));
n = fread(&(dir->num_entries[i]), 1, sizeof(dir->num_entries[i]), thePandalog->file);
assert (n == sizeof(dir->num_entries[i]));
}
// a little hack so unmarshall_chunk will work
dir->pos[nc] = plh->dir_pos;
}
void pandalog_open_read(const char *path, uint32_t pl_mode) {
// NB: 0 chunk size for now -- read_dir will figure this out
pandalog_create(0);
thePandalog->mode = (PlMode) pl_mode;
assert (in_read_mode());
thePandalog->filename = strdup(path);
thePandalog->file = fopen(path, "r");
// read directory (and header)
read_dir();
thePandalog->chunk_num = 0;
if (pl_mode == PL_MODE_READ_FWD) {
// seek to first chunk and unmarshall it
pandalog_seek(0);
}
if (pl_mode == PL_MODE_READ_BWD) {
// seek to last chunk and unmarshall it
pandalog_seek(-1);
}
}
void pandalog_seek(uint64_t instr) {
assert(in_read_mode());
// figure out which chunk this instr in is
uint32_t c = find_chunk(instr, 0, thePandalog->dir.max_chunks-1);
thePandalog->chunk_num = c;
unmarshall_chunk(c);
// figure out ind
uint32_t ind = find_ind(instr, 0, thePandalog->dir.num_entries[c]-1);
if (thePandalog->mode == PL_MODE_READ_BWD) {
// need *last* entry with that instr for backward mode
uint32_t i;
// uint8_t found_entry = 0;
for (i=ind; i<thePandalog->dir.num_entries[c]; i++) {
Panda__LogEntry *ple = thePandalog->chunk.entry[i];
if (ple->instr != instr || instr > ple->instr) {
ind --;
break;
}
}
}
thePandalog->chunk.ind_entry = ind;
}
