static PHYSFS_Io *UNPK_duplicate(PHYSFS_Io *_io)
{
UNPKfileinfo *origfinfo = (UNPKfileinfo *) _io->opaque;
PHYSFS_Io *io = NULL;
PHYSFS_Io *retval = (PHYSFS_Io *) allocator.Malloc(sizeof (PHYSFS_Io));
UNPKfileinfo *finfo = (UNPKfileinfo *) allocator.Malloc(sizeof (UNPKfileinfo));
GOTO_IF_MACRO(!retval, PHYSFS_ERR_OUT_OF_MEMORY, UNPK_duplicate_failed);
GOTO_IF_MACRO(!finfo, PHYSFS_ERR_OUT_OF_MEMORY, UNPK_duplicate_failed);
io = origfinfo->io->duplicate(origfinfo->io);
if (!io) goto UNPK_duplicate_failed;
finfo->io = io;
finfo->entry = origfinfo->entry;
finfo->curPos = 0;
memcpy(retval, _io, sizeof (PHYSFS_Io));
retval->opaque = finfo;
return retval;
UNPK_duplicate_failed:
if (finfo != NULL) allocator.Free(finfo);
if (retval != NULL) allocator.Free(retval);
if (io != NULL) io->destroy(io);
return NULL;
} /* UNPK_duplicate */
~RGSS_entryHandle()
{
io->destroy(io);
}
static PHYSFS_sint64
RGSS_ioRead(PHYSFS_Io *self, void *buffer, PHYSFS_uint64 len)
{
RGSS_entryHandle *entry = static_cast<RGSS_entryHandle*>(self->opaque);
PHYSFS_Io *io = entry->io;
uint64_t toRead = std::min<uint64_t>(entry->data.size - entry->currentOffset, len);
uint64_t offs = entry->currentOffset;
io->seek(io, entry->data.offset + offs);
/* We divide up the bytes to be read in 3 categories:
*
* preAlign: If the current read address is not dword
* aligned, this is the number of bytes to read til
* we reach alignment again (therefore can only be
* 3 or less).
*
* align: The number of aligned dwords we can read
* times 4 (= number of bytes).
*
* postAlign: The number of bytes to read after the
* last aligned dword. Always 3 or less.
*
* Treating the pre- and post aligned reads specially,
* we can read all aligned dwords in one syscall directly
* into the write buffer and then run the xor chain on
* it afterwards. */
uint8_t preAlign = 4 - (offs % 4);
if (preAlign == 4)
preAlign = 0;
else
preAlign = std::min<uint64_t>(preAlign, len);
uint8_t postAlign = (len > preAlign) ? (offs + len) % 4 : 0;
uint64_t align = len - (preAlign + postAlign);
/* Byte buffer pointer */
uint8_t *bBufferP = static_cast<uint8_t*>(buffer);
if (preAlign > 0)
{
uint32_t dword;
io->read(io, &dword, preAlign);
/* Need to align the bytes with the
* magic before xoring */
dword <<= 8 * (offs % 4);
dword ^= entry->currentMagic;
/* Shift them back to normal */
dword >>= 8 * (offs % 4);
memcpy(bBufferP, &dword, preAlign);
bBufferP += preAlign;
/* Only advance the magic if we actually
* reached the next alignment */
if ((offs+preAlign) % 4 == 0)
advanceMagic(entry->currentMagic);
}
