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Rewrite archiving/unarchiving of Lua strings for netgames.

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This now means:
* Lua strings longer than 1024 chars can now be read properly without awful crashes
* Lua strings with embedded zeros can be written/read without truncating anything (hopefully)
This commit is contained in:
Monster Iestyn 2018-08-05 22:02:20 +01:00
parent 74646052b0
commit 2738f3a537
1 changed files with 28 additions and 4 deletions
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32
src/lua_script.c
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@ -526,9 +526,23 @@ static UINT8 ArchiveValue(int TABLESINDEX, int myindex)
break;
}
case LUA_TSTRING:
{
UINT16 len = (UINT16)lua_objlen(gL, myindex); // get length of string, including embedded zeros
const char *s = lua_tostring(gL, myindex);
UINT16 i = 0;
WRITEUINT8(save_p, ARCH_STRING);
WRITESTRING(save_p, lua_tostring(gL, myindex));
// if you're wondering why we're writing a string to save_p this way,
// it turns out that Lua can have embedded zeros ('\0') in the strings,
// so we can't use WRITESTRING as that cuts off when it finds a '\0'.
// Saving the size of the string also allows us to get the size of the string on the other end,
// fixing the awful crashes previously encountered for reading strings longer than 1024
// (yes I know that's kind of a stupid thing to care about, but it'd be evil to trim or ignore them?)
// -- Monster Iestyn 05/08/18
WRITEUINT16(save_p, len); // save size of string
while (i < len)
WRITECHAR(save_p, s[i++]); // write chars individually, including the embedded zeros
break;
}
case LUA_TTABLE:
{
boolean found = false;
@ -809,9 +823,19 @@ static UINT8 UnArchiveValue(int TABLESINDEX)
break;
case ARCH_STRING:
{
char value[1024];
READSTRING(save_p, value);
lua_pushstring(gL, value);
UINT16 len = READUINT16(save_p); // length of string, including embedded zeros
char *value;
UINT16 i = 0;
// See my comments in the ArchiveValue function;
// it's much the same for reading strings as writing them!
// (i.e. we can't use READSTRING either)
// -- Monster Iestyn 05/08/18
value = malloc(len); // make temp buffer of size len
// now read the actual string
while (i < len)
value[i++] = READCHAR(save_p); // read chars individually, including the embedded zeros
lua_pushlstring(gL, value, len); // push the string (note: this function supports embedded zeros)
free(value); // free the buffer
break;
}
case ARCH_TABLE: