void *qalloc(void **root, int size)
{
LINK *link;
link = vfalloc(sizeof(LINK));
link->next = *root;
*root = link;
return link->data = vfalloc(size);
}
void fs_read(loff_t pos,int size,void *data)
{
CHANGE *walk;
int got;
#if 1 // TMN
const size_t readsize_aligned = (size % 512) ? (size + (512 - (size % 512))) : size; // TMN:
const loff_t seekpos_aligned = pos - (pos % 512); // TMN:
const size_t seek_delta = (size_t)(pos - seekpos_aligned); // TMN:
const size_t readsize = (size_t)(pos - seekpos_aligned) + readsize_aligned; // TMN:
char* tmpBuf = vfalloc(readsize_aligned); // TMN:
if (llseek(fd,seekpos_aligned,0) != seekpos_aligned) pdie("Seek to %I64d",pos);
if ((got = read(fd,tmpBuf,readsize_aligned)) < 0) pdie("Read %d bytes at %I64d",size,pos);
assert(got >= size);
got = size;
assert(seek_delta + size <= readsize);
memcpy(data, tmpBuf+seek_delta, size);
vffree(tmpBuf);
#else // TMN:
if (llseek(fd,pos,0) != pos) pdie("Seek to %lld",pos);
if ((got = read(fd,data,size)) < 0) pdie("Read %d bytes at %lld",size,pos);
#endif // TMN:
if (got != size) die("Got %d bytes instead of %d at %I64d",got,size,pos);
for (walk = changes; walk; walk = walk->next) {
if (walk->pos < pos+size && walk->pos+walk->size > pos) {
if (walk->pos < pos)
memcpy(data,(char *) walk->data+pos-walk->pos,min((size_t)size,
(size_t)(walk->size-pos+walk->pos)));
else memcpy((char *) data+walk->pos-pos,walk->data,min((size_t)walk->size,
(size_t)(size+pos-walk->pos)));
}
}
}
void file_add(char *path,FD_TYPE type)
{
FDSC **current,*walk;
char name[MSDOS_NAME];
char *here;
current = &fp_root;
if (*path != '/') die("%s: Absolute path required.",path);
path++;
while (1) {
if ((here = strchr(path,'/'))) *here = 0;
if (!file_cvt((unsigned char*)path,(unsigned char *)name)) {return; /*exit(2);*/}
for (walk = *current; walk; walk = walk->next)
if (!here && (!strncmp(name,walk->name,MSDOS_NAME) || (type ==
fdt_undelete && !strncmp(name+1,walk->name+1,MSDOS_NAME-1))))
die("Ambiguous name: \"%s\"",path);
else if (here && !strncmp(name,walk->name,MSDOS_NAME)) break;
if (!walk) {
walk = vfalloc(sizeof(FDSC));
strncpy(walk->name,name,MSDOS_NAME);
walk->type = here ? fdt_none : type;
walk->first = NULL;
walk->next = *current;
*current = walk;
}
current = &walk->first;
if (!here) break;
*here = '/';
path = here+1;
}
}
int fs_test(loff_t pos,int size)
{
void *scratch;
int okay;
#if 1 // TMN
const size_t readsize_aligned = (size % 512) ? (size + (512 - (size % 512))) : size; // TMN:
const loff_t seekpos_aligned = pos - (pos % 512); // TMN:
scratch = vfalloc(readsize_aligned);
if (llseek(fd,seekpos_aligned,0) != seekpos_aligned) pdie("Seek to %lld",pos);
okay = read(fd,scratch,readsize_aligned) == (int)readsize_aligned;
vffree(scratch);
#else // TMN:
if (llseek(fd,pos,0) != pos) pdie("Seek to %lld",pos);
scratch = vfalloc(size);
okay = read(fd,scratch,size) == size;
vffree(scratch);
#endif // TMN:
return okay;
}