/*
* Finds a subsection directory entry for a specific module.
*/
hll_dir_entry *hllFindDirEntry( imp_image_handle *ii, imp_mod_handle im, hll_sst sst )
{
unsigned i;
unsigned block;
unsigned full_blocks;
unsigned remainder;
hll_dir_entry *p;
full_blocks = BLOCK_FACTOR( ii->dir_count, DIRECTORY_BLOCK_ENTRIES ) - 1;
for( block = 0; block < full_blocks; ++block ) {
for( i = 0; i < DIRECTORY_BLOCK_ENTRIES; ++i ) {
p = &ii->directory[block][i];
if( p->iMod == im && p->subsection == sst) {
return( p );
}
}
}
remainder = ii->dir_count - (full_blocks * DIRECTORY_BLOCK_ENTRIES);
for( i = 0; i < remainder; ++i ) {
p = &ii->directory[block][i];
if( p->iMod == im && p->subsection == sst) {
return( p );
}
}
return( NULL );
}
/*
* Walks the subsection directory.
*
* Use 'sst' to limit the callbacks to one specific type. A 'sst' of 0
* means everything.
*/
walk_result hllWalkDirList( imp_image_handle *ii, hll_sst sst, DIR_WALKER *wk, void *d )
{
unsigned i;
unsigned block;
unsigned full_blocks;
unsigned remainder;
walk_result wr;
hll_dir_entry *p;
full_blocks = BLOCK_FACTOR( ii->dir_count, DIRECTORY_BLOCK_ENTRIES ) - 1;
for( block = 0; block < full_blocks; ++block ) {
for( i = 0; i < DIRECTORY_BLOCK_ENTRIES; ++i ) {
p = &ii->directory[block][i];
if( p->subsection == sst || sst == 0) {
wr = wk( ii, p, d );
if( wr != WR_CONTINUE ) {
return( wr );
}
}
}
}
remainder = ii->dir_count - (full_blocks * DIRECTORY_BLOCK_ENTRIES);
for( i = 0; i < remainder; ++i ) {
p = &ii->directory[block][i];
if( p->subsection == sst || sst == 0) {
wr = wk( ii, p, d );
if( wr != WR_CONTINUE ) {
return( wr );
}
}
}
return( WR_CONTINUE );
}
/*
* Frees resources associated with a image handle.
*/
static void Cleanup( imp_image_handle *ii )
{
imp_image_handle **owner;
imp_image_handle *curr;
unsigned blocks;
unsigned i;
/* unlink it */
owner = &ImageList;
for( ;; ) {
curr = *owner;
if( curr == ii ) {
break;
}
owner = &curr->next_image;
}
*owner = ii->next_image;
/* free memory */
if( ii->directory != NULL ) {
blocks = BLOCK_FACTOR( ii->dir_count, DIRECTORY_BLOCK_ENTRIES );
for( i = 0; i < blocks; ++i ) {
if( ii->directory[i] != NULL ) {
DCFree( ii->directory[i] );
}
}
DCFree( ii->directory );
}
DCFree( ii->segments );
VMFini( ii );
}
dip_status VMInit( imp_image_handle *ii, unsigned long size )
{
ii->vm_dir_num = BLOCK_FACTOR( size, DIR_SIZE * VM_PAGE_SIZE );
ii->virt = DCAllocZ( ii->vm_dir_num * sizeof( ii->virt ) );
if( ii->virt == NULL ) {
DCStatus( DS_ERR|DS_NO_MEM );
return( DS_ERR|DS_NO_MEM );
}
return( DS_OK );
}
static dip_status LoadDirectory( imp_image_handle *ii, unsigned long off )
{
unsigned_32 directory;
cv_subsection_directory dir_header;
unsigned block_count;
unsigned i;
unsigned left;
size_t block_size;
unsigned num;
if( DCSeek( ii->sym_fid, off, DIG_ORG ) != off ) {
return( DS_ERR|DS_FSEEK_FAILED );
}
if( DCRead( ii->sym_fid, &directory, sizeof( directory ) ) != sizeof( directory ) ) {
return( DS_ERR|DS_FREAD_FAILED );
}
if( DCSeek( ii->sym_fid, ii->bias + directory, DIG_ORG ) != (ii->bias + directory) ) {
return( DS_ERR|DS_FSEEK_FAILED );
}
if( DCRead( ii->sym_fid, &dir_header, sizeof( dir_header ) ) != sizeof( dir_header ) ) {
return( DS_ERR|DS_FREAD_FAILED );
}
if( dir_header.cbDirHeader != sizeof( dir_header )
|| dir_header.cbDirEntry != sizeof( cv_directory_entry ) ) {
return( DS_ERR|DS_INFO_INVALID );
}
ii->dir_count = dir_header.cDir;
block_count = BLOCK_FACTOR( ii->dir_count, DIRECTORY_BLOCK_ENTRIES );
ii->directory = DCAlloc( block_count * sizeof( cv_directory_entry * ) );
if( ii->directory == NULL ) {
return( DS_ERR|DS_NO_MEM );
}
memset( ii->directory, 0, block_count * sizeof( cv_directory_entry * ) );
i = 0;
left = ii->dir_count;
for( ;; ) {
num = left;
if( num > DIRECTORY_BLOCK_ENTRIES )
num = DIRECTORY_BLOCK_ENTRIES;
block_size = num * sizeof( cv_directory_entry );
ii->directory[i] = DCAlloc( block_size );
if( ii->directory[i] == NULL ) {
return( DS_ERR|DS_NO_MEM );
}
if( DCRead( ii->sym_fid, ii->directory[i], block_size ) != block_size ) {
return( DS_ERR|DS_FREAD_FAILED );
}
++i;
left -= num;
if( left == 0 ) {
break;
}
}
return( DS_OK );
}
/*
* Loads the HLL directory.
*
* 'offent' is the file offset of the first directory entry.
*/
static dip_status LoadDirectory( imp_image_handle *ii, unsigned long offent )
{
unsigned block_count;
unsigned i;
unsigned left;
size_t block_size;
unsigned num;
/*
* Read the directory entries. We're using a two-level table here,
* probably to avoid allocating big chunks of memory...
*/
block_count = BLOCK_FACTOR( ii->dir_count, DIRECTORY_BLOCK_ENTRIES );
ii->directory = DCAlloc( block_count * sizeof( void * ) );
if( ii->directory == NULL ) {
return( DS_ERR | DS_NO_MEM );
}
memset( ii->directory, 0, block_count * sizeof( void * ) );
/* skip to the first entry */
if( DCSeek( ii->sym_file, offent, DIG_ORG ) != offent) {
return( DS_ERR | DS_FSEEK_FAILED );
}
i = 0;
left = ii->dir_count;
do {
num = left;
if( num > DIRECTORY_BLOCK_ENTRIES ) {
num = DIRECTORY_BLOCK_ENTRIES;
}
block_size = num * sizeof( hll_dir_entry );
ii->directory[i] = DCAlloc( block_size );
if( ii->directory[i] == NULL ) {
return( DS_ERR | DS_NO_MEM );
}
if( ii->format_lvl >= HLL_LVL_NB04 ) {
if( DCRead( ii->sym_file, ii->directory[i], block_size ) != block_size ) {
return( DS_ERR | DS_FREAD_FAILED );
}
} else {
/* Slow but simple. */
int j;
hll_dir_entry *ent = ii->directory[i];
for( j = 0; j < num; j++, ent++ ) {
cv3_dir_entry cv3ent;
if( DCRead( ii->sym_file, &cv3ent, sizeof( cv3ent ) ) != sizeof( cv3ent ) ) {
return( DS_ERR | DS_FREAD_FAILED );
}
ent->subsection = cv3ent.subsection;
ent->iMod = cv3ent.iMod;
ent->lfo = cv3ent.lfo;
ent->cb = cv3ent.cb;
}
}
++i;
left -= num;
} while( left != 0 );
return( DS_OK );
}
void *VMBlock( imp_image_handle *iih, virt_mem start, size_t len )
{
unsigned dir_idx;
unsigned pg_idx;
unsigned tmp_idx;
unsigned i;
unsigned j;
unsigned num_pages;
virt_mem pg_start;
virt_page *pg;
virt_page *zero;
loaded_block *block;
dir_idx = GET_DIR( start );
if( iih->virt[dir_idx] == NULL ) {
if( !InitPageDir( iih, dir_idx ) ) {
return( NULL );
}
}
pg_idx = GET_PAGE( start );
len += start % VM_PAGE_SIZE;
pg_start = start & ~(virt_mem)(VM_PAGE_SIZE - 1);
pg = iih->virt[dir_idx][pg_idx];
if( pg == NULL || ( pg->block->len - pg->offset ) < len ) {
/* unloaded previously loaded block */
if( pg != NULL ) {
tmp_idx = dir_idx;
/* find first page of the block */
i = pg_idx;
for( ;; ) {
iih->virt[tmp_idx][i] = NULL;
if( pg->offset == 0 )
break;
if( i == 0 ) {
--tmp_idx;
i = DIR_SIZE;
}
--i;
--pg;
}
DCFree( pg );
}
num_pages = BLOCK_FACTOR( len, VM_PAGE_SIZE );
pg = DCAlloc( num_pages * ( sizeof( *pg ) + VM_PAGE_SIZE ) + sizeof( loaded_block ) - 1 );
if( pg == NULL ) {
DCStatus( DS_ERR | DS_NO_MEM );
return( NULL );
}
/* set up new page table entries */
block = (loaded_block *)&pg[num_pages];
tmp_idx = dir_idx;
for( j = pg_idx, i = 0; i < num_pages; ++j, ++i ) {
pg[i].block = block;
pg[i].offset = i * VM_PAGE_SIZE;
if( j >= DIR_SIZE ) {
++tmp_idx;
j = 0;
}
if( iih->virt[tmp_idx] == NULL ) {
if( !InitPageDir( iih, tmp_idx ) ) {
/* unwind the setup already done */
num_pages = i;
for( i = 0; i < num_pages; ++i, ++pg_idx ) {
if( pg_idx >= DIR_SIZE ) {
++dir_idx;
pg_idx = 0;
}
iih->virt[dir_idx][pg_idx] = NULL;
}
DCFree( pg );
return( NULL );
}
}
if( iih->virt[tmp_idx][j] != NULL ) {
/*
We just ran into another allocated block, so we have
to kill all the pages mapped in by it. We know that
if the page pointer is non-NULL, it will be offset==0
since KillPages will clean out the others.
*/
KillPages( iih, tmp_idx, j );
}
iih->virt[tmp_idx][j] = &pg[i];
}
/* read in new block */
len = num_pages * VM_PAGE_SIZE;
block->len = len;
pg_start += iih->bias;
if( DCSeek( iih->sym_fp, pg_start, DIG_ORG ) ) {
DCStatus( DS_ERR | DS_FSEEK_FAILED );
return( NULL );
}
/* last block might be a short read */
if( DCRead( iih->sym_fp, pg->block->data, len ) == DIG_RW_ERROR ) {
DCStatus( DS_ERR | DS_FREAD_FAILED );
return( NULL );
}
pg = iih->virt[dir_idx][pg_idx];
}
++TimeStamp;
if( TimeStamp == 0 ) {
/* deal with wrap-around */
for( iih = ImageList; iih != NULL; iih = iih->next_image ) {
if( iih->virt != NULL ) {
for( i = iih->vm_dir_num; i-- > 0; ) {
if( iih->virt[i] != NULL ) {
for( j = DIR_SIZE; j-- > 0; ) {
zero = iih->virt[i][j];
if( zero != NULL ) {
zero->block->time_stamp = 0;
}
}
}
}
}
}
++TimeStamp;
}
pg->block->time_stamp = TimeStamp;
return( &pg->block->data[(start & (VM_PAGE_SIZE - 1)) + pg->offset] );
}
