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|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "glk/glulxe/glulxe.h"
namespace Glk {
namespace Glulxe {
#define IFFID(c1, c2, c3, c4) MKTAG(c1, c2, c3, c4)
bool Glulxe::init_serial() {
undo_chain_num = 0;
undo_chain_size = max_undo_level;
undo_chain = (unsigned char **)glulx_malloc(sizeof(unsigned char *) * undo_chain_size);
if (!undo_chain)
return false;
#ifdef SERIALIZE_CACHE_RAM
{
uint len = (endmem - ramstart);
uint res;
ramcache = (unsigned char *)glulx_malloc(sizeof(unsigned char *) * len);
if (!ramcache)
return false;
_gameFile.seek(gamefile_start + ramstart);
res = _gameFile.read(ramcache, len);
if (res != len)
return false;
}
#endif /* SERIALIZE_CACHE_RAM */
return true;
}
void Glulxe::final_serial() {
if (undo_chain) {
int ix;
for (ix = 0; ix < undo_chain_num; ix++) {
glulx_free(undo_chain[ix]);
}
glulx_free(undo_chain);
}
undo_chain = nullptr;
undo_chain_size = 0;
undo_chain_num = 0;
#ifdef SERIALIZE_CACHE_RAM
if (ramcache) {
glulx_free(ramcache);
ramcache = nullptr;
}
#endif /* SERIALIZE_CACHE_RAM */
}
uint Glulxe::perform_saveundo() {
dest_t dest;
uint res;
uint memstart = 0, memlen = 0, heapstart = 0, heaplen = 0;
uint stackstart = 0, stacklen = 0;
/* The format for undo-saves is simpler than for saves on disk. We
just have a memory chunk, a heap chunk, and a stack chunk, in
that order. We skip the IFF chunk headers (although the size
fields are still there.) We also don't bother with IFF's 16-bit
alignment. */
if (undo_chain_size == 0)
return 1;
dest.ismem = true;
dest.size = 0;
dest.pos = 0;
dest.ptr = nullptr;
dest.str = nullptr;
res = 0;
if (res == 0) {
res = write_long(&dest, 0); /* space for chunk length */
}
if (res == 0) {
memstart = dest.pos;
res = write_memstate(&dest);
memlen = dest.pos - memstart;
}
if (res == 0) {
res = write_long(&dest, 0); /* space for chunk length */
}
if (res == 0) {
heapstart = dest.pos;
res = write_heapstate(&dest, false);
heaplen = dest.pos - heapstart;
}
if (res == 0) {
res = write_long(&dest, 0); /* space for chunk length */
}
if (res == 0) {
stackstart = dest.pos;
res = write_stackstate(&dest, false);
stacklen = dest.pos - stackstart;
}
if (res == 0) {
/* Trim it down to the perfect size. */
dest.ptr = (byte *)glulx_realloc(dest.ptr, dest.pos);
if (!dest.ptr)
res = 1;
}
if (res == 0) {
res = reposition_write(&dest, memstart - 4);
}
if (res == 0) {
res = write_long(&dest, memlen);
}
if (res == 0) {
res = reposition_write(&dest, heapstart - 4);
}
if (res == 0) {
res = write_long(&dest, heaplen);
}
if (res == 0) {
res = reposition_write(&dest, stackstart - 4);
}
if (res == 0) {
res = write_long(&dest, stacklen);
}
if (res == 0) {
/* It worked. */
if (undo_chain_num >= undo_chain_size) {
glulx_free(undo_chain[undo_chain_num - 1]);
undo_chain[undo_chain_num - 1] = nullptr;
}
if (undo_chain_size > 1)
memmove(undo_chain + 1, undo_chain,
(undo_chain_size - 1) * sizeof(unsigned char *));
undo_chain[0] = dest.ptr;
if (undo_chain_num < undo_chain_size)
undo_chain_num += 1;
dest.ptr = nullptr;
} else {
/* It didn't work. */
if (dest.ptr) {
glulx_free(dest.ptr);
dest.ptr = nullptr;
}
}
return res;
}
uint Glulxe::perform_restoreundo() {
dest_t dest;
uint res, val = 0;
uint heapsumlen = 0;
uint *heapsumarr = nullptr;
/* If profiling is enabled and active then fail. */
#if VM_PROFILING
if (profile_profiling_active())
return 1;
#endif /* VM_PROFILING */
if (undo_chain_size == 0 || undo_chain_num == 0)
return 1;
dest.ismem = true;
dest.size = 0;
dest.pos = 0;
dest.ptr = undo_chain[0];
dest.str = nullptr;
res = 0;
if (res == 0) {
res = read_long(&dest, &val);
}
if (res == 0) {
res = read_memstate(&dest, val);
}
if (res == 0) {
res = read_long(&dest, &val);
}
if (res == 0) {
res = read_heapstate(&dest, val, false, &heapsumlen, &heapsumarr);
}
if (res == 0) {
res = read_long(&dest, &val);
}
if (res == 0) {
res = read_stackstate(&dest, val, false);
}
/* ### really, many of the failure modes of those calls ought to
cause fatal errors. The stack or main memory may be damaged now. */
if (res == 0) {
if (heapsumarr)
res = heap_apply_summary(heapsumlen, heapsumarr);
}
if (res == 0) {
/* It worked. */
if (undo_chain_size > 1)
memmove(undo_chain, undo_chain + 1,
(undo_chain_size - 1) * sizeof(unsigned char *));
undo_chain_num -= 1;
glulx_free(dest.ptr);
dest.ptr = nullptr;
} else {
/* It didn't work. */
dest.ptr = nullptr;
}
return res;
}
Common::Error Glulxe::writeGameData(Common::WriteStream *ws) {
dest_t dest;
int ix;
uint res = 0, lx, val;
uint memstart = 0, memlen = 0, stackstart = 0, stacklen = 0;
uint heapstart = 0, heaplen = 0, filestart = 0, filelen = 0;
#ifdef TODO
stream_get_iosys(&val, &lx);
if (val != 2) {
/* Not using the Glk I/O system, so bail. This function only
knows how to write to a Glk stream. */
fatal_error("Streams are only available in Glk I/O system.");
}
if (ws == nullptr)
return Common::kUnknownError;
dest.ismem = false;
dest.size = 0;
dest.pos = 0;
dest.ptr = nullptr;
dest.str = ws;
res = 0;
/* Quetzal header. */
if (res == 0) {
res = write_long(&dest, IFFID('F', 'O', 'R', 'M'));
}
if (res == 0) {
res = write_long(&dest, 0); /* space for file length */
filestart = dest.pos;
}
if (res == 0) {
res = write_long(&dest, IFFID('I', 'F', 'Z', 'S')); /* ### ? */
}
/* Header chunk. This is the first 128 bytes of memory. */
if (res == 0) {
res = write_long(&dest, IFFID('I', 'F', 'h', 'd'));
}
if (res == 0) {
res = write_long(&dest, 128);
}
for (ix = 0; res == 0 && ix < 128; ix++) {
res = write_byte(&dest, Mem1(ix));
}
/* Always even, so no padding necessary. */
/* Memory chunk. */
if (res == 0) {
res = write_long(&dest, IFFID('C', 'M', 'e', 'm'));
}
if (res == 0) {
res = write_long(&dest, 0); /* space for chunk length */
}
if (res == 0) {
memstart = dest.pos;
res = write_memstate(&dest);
memlen = dest.pos - memstart;
}
if (res == 0 && (memlen & 1) != 0) {
res = write_byte(&dest, 0);
}
/* Heap chunk. */
if (res == 0) {
res = write_long(&dest, IFFID('M', 'A', 'l', 'l'));
}
if (res == 0) {
res = write_long(&dest, 0); /* space for chunk length */
}
if (res == 0) {
heapstart = dest.pos;
res = write_heapstate(&dest, true);
heaplen = dest.pos - heapstart;
}
/* Always even, so no padding necessary. */
/* Stack chunk. */
if (res == 0) {
res = write_long(&dest, IFFID('S', 't', 'k', 's'));
}
if (res == 0) {
res = write_long(&dest, 0); /* space for chunk length */
}
if (res == 0) {
stackstart = dest.pos;
res = write_stackstate(&dest, true);
stacklen = dest.pos - stackstart;
}
if (res == 0 && (stacklen & 1) != 0) {
res = write_byte(&dest, 0);
}
filelen = dest.pos - filestart;
/* Okay, fill in all the lengths. */
if (res == 0) {
res = reposition_write(&dest, memstart - 4);
}
if (res == 0) {
res = write_long(&dest, memlen);
}
if (res == 0) {
res = reposition_write(&dest, heapstart - 4);
}
if (res == 0) {
res = write_long(&dest, heaplen);
}
if (res == 0) {
res = reposition_write(&dest, stackstart - 4);
}
if (res == 0) {
res = write_long(&dest, stacklen);
}
if (res == 0) {
res = reposition_write(&dest, filestart - 4);
}
if (res == 0) {
res = write_long(&dest, filelen);
}
/* All done. */
#endif
return res ? Common::kUnknownError : Common::kNoError;
}
Common::Error Glulxe::readSaveData(Common::SeekableReadStream *rs) {
dest_t dest;
int ix;
uint lx = 0, res, val;
uint filestart, filelen = 0;
uint heapsumlen = 0;
uint *heapsumarr = nullptr;
bool fromshell = false;
#ifdef TODO
/* If profiling is enabled and active then fail. */
#if VM_PROFILING
if (profile_profiling_active())
return 1;
#endif /* VM_PROFILING */
stream_get_iosys(&val, &lx);
if (val != 2 && !fromshell) {
/* Not using the Glk I/O system, so bail. This function only
knows how to read from a Glk stream. (But in the autorestore
case, iosys hasn't been set yet, so ignore this test.) */
fatal_error("Streams are only available in Glk I/O system.");
}
if (str == 0)
return Common::kUnknownError;
dest.ismem = false;
dest.size = 0;
dest.pos = 0;
dest.ptr = nullptr;
dest.str = str;
res = 0;
/* ### the format errors checked below should send error messages to
the current stream. */
if (res == 0) {
res = read_long(&dest, &val);
}
if (res == 0 && val != IFFID('F', 'O', 'R', 'M')) {
/* ### bad header */
return Common::kUnknownError;
}
if (res == 0) {
res = read_long(&dest, &filelen);
}
filestart = dest.pos;
if (res == 0) {
res = read_long(&dest, &val);
}
if (res == 0 && val != IFFID('I', 'F', 'Z', 'S')) { /* ### ? */
/* ### bad header */
return Common::kUnknownError;
}
while (res == 0 && dest.pos < filestart + filelen) {
/* Read a chunk and deal with it. */
uint chunktype = 0, chunkstart = 0, chunklen = 0;
unsigned char dummy;
if (res == 0) {
res = read_long(&dest, &chunktype);
}
if (res == 0) {
res = read_long(&dest, &chunklen);
}
chunkstart = dest.pos;
if (chunktype == IFFID('I', 'F', 'h', 'd')) {
for (ix = 0; res == 0 && ix < 128; ix++) {
res = read_byte(&dest, &dummy);
if (res == 0 && Mem1(ix) != dummy) {
/* ### non-matching header */
return Common::kUnknownError;
}
}
} else if (chunktype == IFFID('C', 'M', 'e', 'm')) {
res = read_memstate(&dest, chunklen);
} else if (chunktype == IFFID('M', 'A', 'l', 'l')) {
res = read_heapstate(&dest, chunklen, true, &heapsumlen, &heapsumarr);
} else if (chunktype == IFFID('S', 't', 'k', 's')) {
res = read_stackstate(&dest, chunklen, true);
} else {
/* Unknown chunk type. Skip it. */
for (lx = 0; res == 0 && lx < chunklen; lx++) {
res = read_byte(&dest, &dummy);
}
}
if (chunkstart + chunklen != dest.pos) {
/* ### funny chunk length */
return Common::kUnknownError;
}
if ((chunklen & 1) != 0) {
if (res == 0) {
res = read_byte(&dest, &dummy);
}
}
}
if (res == 0) {
if (heapsumarr) {
/* The summary might have come from any interpreter, so it could
be out of order. We'll sort it. */
glulx_sort(heapsumarr + 2, (heapsumlen - 2) / 2, 2 * sizeof(uint), &sort_heap_summary);
res = heap_apply_summary(heapsumlen, heapsumarr);
}
}
if (res)
return Common::kUnknownError;
#endif
return Common::kNoError;
}
int Glulxe::reposition_write(dest_t *dest, uint pos) {
if (dest->ismem) {
dest->pos = pos;
} else {
glk_stream_set_position(dest->str, pos, seekmode_Start);
dest->pos = pos;
}
return 0;
}
int Glulxe::write_buffer(dest_t *dest, const byte *ptr, uint len) {
if (dest->ismem) {
if (dest->pos + len > dest->size) {
dest->size = dest->pos + len + 1024;
if (!dest->ptr) {
dest->ptr = (byte *)glulx_malloc(dest->size);
} else {
dest->ptr = (byte *)glulx_realloc(dest->ptr, dest->size);
}
if (!dest->ptr)
return 1;
}
memcpy(dest->ptr + dest->pos, ptr, len);
} else {
glk_put_buffer_stream(dest->str, (const char *)ptr, len);
}
dest->pos += len;
return 0;
}
int Glulxe::read_buffer(dest_t *dest, byte *ptr, uint len) {
uint newlen;
if (dest->ismem) {
memcpy(ptr, dest->ptr + dest->pos, len);
} else {
newlen = glk_get_buffer_stream(dest->str, (char *)ptr, len);
if (newlen != len)
return 1;
}
dest->pos += len;
return 0;
}
int Glulxe::write_long(dest_t *dest, uint val) {
unsigned char buf[4];
Write4(buf, val);
return write_buffer(dest, buf, 4);
}
int Glulxe::write_short(dest_t *dest, uint16 val) {
unsigned char buf[2];
Write2(buf, val);
return write_buffer(dest, buf, 2);
}
int Glulxe::write_byte(dest_t *dest, byte val) {
return write_buffer(dest, &val, 1);
}
int Glulxe::read_long(dest_t *dest, uint *val) {
unsigned char buf[4];
int res = read_buffer(dest, buf, 4);
if (res)
return res;
*val = Read4(buf);
return 0;
}
int Glulxe::read_short(dest_t *dest, uint16 *val) {
unsigned char buf[2];
int res = read_buffer(dest, buf, 2);
if (res)
return res;
*val = Read2(buf);
return 0;
}
int Glulxe::read_byte(dest_t *dest, byte *val) {
return read_buffer(dest, val, 1);
}
uint Glulxe::write_memstate(dest_t *dest) {
uint res, pos;
int val;
int runlen;
unsigned char ch;
#ifdef SERIALIZE_CACHE_RAM
uint cachepos;
#endif /* SERIALIZE_CACHE_RAM */
res = write_long(dest, endmem);
if (res)
return res;
runlen = 0;
#ifdef SERIALIZE_CACHE_RAM
cachepos = 0;
#else /* SERIALIZE_CACHE_RAM */
_gameFile.seek(gamefile_start + ramstart);
#endif /* SERIALIZE_CACHE_RAM */
for (pos = ramstart; pos < endmem; pos++) {
ch = Mem1(pos);
if (pos < endgamefile) {
#ifdef SERIALIZE_CACHE_RAM
val = ramcache[cachepos];
cachepos++;
#else /* SERIALIZE_CACHE_RAM */
val = glk_get_char_stream(gamefile);
if (val == -1) {
fatal_error("The game file ended unexpectedly while saving.");
}
#endif /* SERIALIZE_CACHE_RAM */
ch ^= (unsigned char)val;
}
if (ch == 0) {
runlen++;
} else {
/* Write any run we've got. */
while (runlen) {
if (runlen >= 0x100)
val = 0x100;
else
val = runlen;
res = write_byte(dest, 0);
if (res)
return res;
res = write_byte(dest, (val - 1));
if (res)
return res;
runlen -= val;
}
/* Write the byte we got. */
res = write_byte(dest, ch);
if (res)
return res;
}
}
/* It's possible we've got a run left over, but we don't write it. */
return 0;
}
uint Glulxe::read_memstate(dest_t *dest, uint chunklen) {
uint chunkend = dest->pos + chunklen;
uint newlen;
uint res, pos;
int val;
int runlen;
unsigned char ch, ch2;
#ifdef SERIALIZE_CACHE_RAM
uint cachepos;
#endif /* SERIALIZE_CACHE_RAM */
heap_clear();
res = read_long(dest, &newlen);
if (res)
return res;
res = change_memsize(newlen, false);
if (res)
return res;
runlen = 0;
#ifdef SERIALIZE_CACHE_RAM
cachepos = 0;
#else /* SERIALIZE_CACHE_RAM */
_gameFile.seek(gamefile_start + ramstart);
#endif /* SERIALIZE_CACHE_RAM */
for (pos = ramstart; pos < endmem; pos++) {
if (pos < endgamefile) {
#ifdef SERIALIZE_CACHE_RAM
val = ramcache[cachepos];
cachepos++;
#else /* SERIALIZE_CACHE_RAM */
if (_gameFile.pos() >= _gameFile.size()) {
fatal_error("The game file ended unexpectedly while restoring.");
val = _gameFile.readByte();
}
#endif /* SERIALIZE_CACHE_RAM */
ch = (unsigned char)val;
} else {
ch = 0;
}
if (dest->pos >= chunkend) {
/* we're into the final, unstored run. */
} else if (runlen) {
runlen--;
} else {
res = read_byte(dest, &ch2);
if (res)
return res;
if (ch2 == 0) {
res = read_byte(dest, &ch2);
if (res)
return res;
runlen = (uint)ch2;
} else {
ch ^= ch2;
}
}
if (pos >= protectstart && pos < protectend)
continue;
MemW1(pos, ch);
}
return 0;
}
uint Glulxe::write_heapstate(dest_t *dest, int portable) {
uint res;
uint sumlen;
uint *sumarray;
res = heap_get_summary(&sumlen, &sumarray);
if (res)
return res;
if (!sumarray)
return 0; /* no heap */
res = write_heapstate_sub(sumlen, sumarray, dest, portable);
glulx_free(sumarray);
return res;
}
uint Glulxe::write_heapstate_sub(uint sumlen, uint *sumarray, dest_t *dest, int portable) {
uint res, lx;
/* If we're storing for the purpose of undo, we don't need to do any
byte-swapping, because the result will only be used by this session. */
if (!portable) {
res = write_buffer(dest, (const byte *)sumarray, sumlen * sizeof(uint));
if (res)
return res;
return 0;
}
for (lx = 0; lx < sumlen; lx++) {
res = write_long(dest, sumarray[lx]);
if (res)
return res;
}
return 0;
}
int Glulxe::sort_heap_summary(const void *p1, const void *p2) {
uint v1 = *(const uint *)p1;
uint v2 = *(const uint *)p2;
if (v1 < v2)
return -1;
if (v1 > v2)
return 1;
return 0;
}
uint Glulxe::read_heapstate(dest_t *dest, uint chunklen, int portable, uint *sumlen, uint **summary) {
uint res, count, lx;
uint *arr;
*sumlen = 0;
*summary = nullptr;
if (chunklen == 0)
return 0; /* no heap */
if (!portable) {
count = chunklen / sizeof(uint);
arr = (uint *)glulx_malloc(chunklen);
if (!arr)
return 1;
res = read_buffer(dest, (byte *)arr, chunklen);
if (res)
return res;
*sumlen = count;
*summary = arr;
return 0;
}
count = chunklen / 4;
arr = (uint *)glulx_malloc(count * sizeof(uint));
if (!arr)
return 1;
for (lx = 0; lx < count; lx++) {
res = read_long(dest, arr + lx);
if (res)
return res;
}
*sumlen = count;
*summary = arr;
return 0;
}
uint Glulxe::write_stackstate(dest_t *dest, int portable) {
uint res;
uint lx;
uint lastframe;
/* If we're storing for the purpose of undo, we don't need to do any
byte-swapping, because the result will only be used by this session. */
if (!portable) {
res = write_buffer(dest, stack, stackptr);
if (res)
return res;
return 0;
}
/* Write a portable stack image. To do this, we have to write stack
frames in order, bottom to top. Remember that the last word of
every stack frame is a pointer to the beginning of that stack frame.
(This includes the last frame, because the save opcode pushes on
a call stub before it calls perform_save().) */
lastframe = (uint)(-1);
while (1) {
uint frameend, frm, frm2, frm3;
unsigned char loctype, loccount;
uint numlocals, frlen, locpos;
/* Find the next stack frame (after the one in lastframe). Sadly,
this requires searching the stack from the top down. We have to
do this for *every* frame, which takes N^2 time overall. But
save routines usually aren't nested very deep.
If it becomes a practical problem, we can build a stack-frame
array, which requires dynamic allocation. */
for (frm = stackptr, frameend = stackptr;
frm != 0 && (frm2 = Stk4(frm - 4)) != lastframe;
frameend = frm, frm = frm2) { };
/* Write out the frame. */
frm2 = frm;
frlen = Stk4(frm2);
frm2 += 4;
res = write_long(dest, frlen);
if (res)
return res;
locpos = Stk4(frm2);
frm2 += 4;
res = write_long(dest, locpos);
if (res)
return res;
frm3 = frm2;
numlocals = 0;
while (1) {
loctype = Stk1(frm2);
frm2 += 1;
loccount = Stk1(frm2);
frm2 += 1;
res = write_byte(dest, loctype);
if (res)
return res;
res = write_byte(dest, loccount);
if (res)
return res;
if (loctype == 0 && loccount == 0)
break;
numlocals++;
}
if ((numlocals & 1) == 0) {
res = write_byte(dest, 0);
if (res)
return res;
res = write_byte(dest, 0);
if (res)
return res;
frm2 += 2;
}
if (frm2 != frm + locpos)
fatal_error("Inconsistent stack frame during save.");
/* Write out the locals. */
for (lx = 0; lx < numlocals; lx++) {
loctype = Stk1(frm3);
frm3 += 1;
loccount = Stk1(frm3);
frm3 += 1;
if (loctype == 0 && loccount == 0)
break;
/* Put in up to 0, 1, or 3 bytes of padding, depending on loctype. */
while (frm2 & (loctype - 1)) {
res = write_byte(dest, 0);
if (res)
return res;
frm2 += 1;
}
/* Put in this set of locals. */
switch (loctype) {
case 1:
do {
res = write_byte(dest, Stk1(frm2));
if (res)
return res;
frm2 += 1;
loccount--;
} while (loccount);
break;
case 2:
do {
res = write_short(dest, Stk2(frm2));
if (res)
return res;
frm2 += 2;
loccount--;
} while (loccount);
break;
case 4:
do {
res = write_long(dest, Stk4(frm2));
if (res)
return res;
frm2 += 4;
loccount--;
} while (loccount);
break;
}
}
if (frm2 != frm + frlen)
fatal_error("Inconsistent stack frame during save.");
while (frm2 < frameend) {
res = write_long(dest, Stk4(frm2));
if (res)
return res;
frm2 += 4;
}
/* Go on to the next frame. */
if (frameend == stackptr)
break; /* All done. */
lastframe = frm;
}
return 0;
}
uint Glulxe::read_stackstate(dest_t *dest, uint chunklen, int portable) {
uint res;
uint frameend, frm, frm2, frm3, locpos, frlen, numlocals;
if (chunklen > stacksize)
return 1;
stackptr = chunklen;
frameptr = 0;
valstackbase = 0;
localsbase = 0;
if (!portable) {
res = read_buffer(dest, stack, stackptr);
if (res)
return res;
return 0;
}
/* This isn't going to be pleasant; we're going to read the data in
as a block, and then convert it in-place. */
res = read_buffer(dest, stack, stackptr);
if (res)
return res;
frameend = stackptr;
while (frameend != 0) {
/* Read the beginning-of-frame pointer. Remember, right now, the
whole frame is stored big-endian. So we have to read with the
Read*() macros, and then write with the StkW*() macros. */
frm = Read4(stack + (frameend - 4));
frm2 = frm;
frlen = Read4(stack + frm2);
StkW4(frm2, frlen);
frm2 += 4;
locpos = Read4(stack + frm2);
StkW4(frm2, locpos);
frm2 += 4;
/* The locals-format list is in bytes, so we don't have to convert it. */
frm3 = frm2;
frm2 = frm + locpos;
numlocals = 0;
while (1) {
unsigned char loctype, loccount;
loctype = Read1(stack + frm3);
frm3 += 1;
loccount = Read1(stack + frm3);
frm3 += 1;
if (loctype == 0 && loccount == 0)
break;
/* Skip up to 0, 1, or 3 bytes of padding, depending on loctype. */
while (frm2 & (loctype - 1)) {
StkW1(frm2, 0);
frm2++;
}
/* Convert this set of locals. */
switch (loctype) {
case 1:
do {
/* Don't need to convert bytes. */
frm2 += 1;
loccount--;
} while (loccount);
break;
case 2:
do {
uint16 loc = Read2(stack + frm2);
StkW2(frm2, loc);
frm2 += 2;
loccount--;
} while (loccount);
break;
case 4:
do {
uint loc = Read4(stack + frm2);
StkW4(frm2, loc);
frm2 += 4;
loccount--;
} while (loccount);
break;
}
numlocals++;
}
if ((numlocals & 1) == 0) {
StkW1(frm3, 0);
frm3++;
StkW1(frm3, 0);
frm3++;
}
if (frm3 != frm + locpos) {
return 1;
}
while (frm2 & 3) {
StkW1(frm2, 0);
frm2++;
}
if (frm2 != frm + frlen) {
return 1;
}
/* Now, the values pushed on the stack after the call frame itself.
This includes the stub. */
while (frm2 < frameend) {
uint loc = Read4(stack + frm2);
StkW4(frm2, loc);
frm2 += 4;
}
frameend = frm;
}
return 0;
}
uint Glulxe::perform_verify() {
uint len, chksum = 0, newlen;
unsigned char buf[4];
uint val, newsum, ix;
len = gamefile_len;
if (len < 256 || (len & 0xFF) != 0)
return 1;
_gameFile.seek(gamefile_start);
newsum = 0;
/* Read the header */
for (ix = 0; ix < 9; ix++) {
newlen = _gameFile.read(buf, 4);
if (newlen != 4)
return 1;
val = Read4(buf);
if (ix == 3) {
if (len != val)
return 1;
}
if (ix == 8)
chksum = val;
else
newsum += val;
}
/* Read everything else */
for (; ix < len / 4; ix++) {
newlen = _gameFile.read(buf, 4);
if (newlen != 4)
return 1;
val = Read4(buf);
newsum += val;
}
if (newsum != chksum)
return 1;
return 0;
}
} // End of namespace Glulxe
} // End of namespace Glk
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