lzma_vli read_file_index(lzma_vli offset) {
void *bdata = NULL;
if (!offset)
offset = find_file_index(&bdata);
if (!offset)
return 0;
while (true) {
char *name = read_file_index_name();
if (!name)
break;
file_index_t *f = malloc(sizeof(file_index_t));
f->name = strlen(name) ? xstrdup(name) : NULL;
f->offset = xle64dec(gFileIndexBuf + gFIBPos);
gFIBPos += sizeof(uint64_t);
if (gLastFile) {
gLastFile->next = f;
} else {
gFileIndex = f;
}
gLastFile = f;
}
free(gFileIndexBuf);
lzma_end(&gStream);
free(bdata);
return offset;
}
lzma_vli find_file_index(void **bdatap) {
if (!gIndex)
decode_index();
// find the last block
lzma_index_iter iter;
lzma_index_iter_init(&iter, gIndex);
lzma_vli loc = lzma_index_uncompressed_size(gIndex) - 1;
if (lzma_index_iter_locate(&iter, loc))
die("Can't locate file index block");
void *bdata = decode_block_start(iter.block.compressed_file_offset);
gFileIndexBuf = malloc(gFIBSize);
gStream.avail_out = gFIBSize;
gStream.avail_in = 0;
// Check if this is really an index
read_file_index_data();
lzma_vli ret = iter.block.compressed_file_offset;
if (xle64dec(gFileIndexBuf + gFIBPos) != PIXZ_INDEX_MAGIC)
ret = 0;
gFIBPos += sizeof(uint64_t);
if (bdatap && ret) {
*bdatap = bdata;
} else {
// Just looking, don't keep things around
if (bdatap)
*bdatap = NULL;
free(bdata);
free(gFileIndexBuf);
gLastFile = gFileIndex = NULL;
lzma_end(&gStream);
}
return ret;
}
static bool taste_file_index(io_block_t *ib) {
return xle64dec(ib->output) == PIXZ_INDEX_MAGIC;
}
