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Fiddle: fix makefile dependency issue and duplicate inclusion of post-js.js. Reimplement db export using sqlite3_serialize().

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FossilOrigin-Name: 29db7de79232c21d19b91bb0fc253114e02e21dd9bf90619453dbe72a4c8bf7f
This commit is contained in:
stephan
2022-10-01 16:01:41 +00:00
parent be9d203665
commit 32781427d7
8 changed files with 151 additions and 115 deletions
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47
ext/wasm/api/sqlite3-api-prologue.js
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@ -870,6 +870,51 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
return rc;
};
/**
Serializes the given `sqlite3*` pointer to a Uint8Array, as per
sqlite3_serialize(). On success it returns a Uint8Array. On
error it throws with a description of the problem.
*/
capi.sqlite3_web_db_export = function(pDb){
if(!pDb) toss('Invalid sqlite3* argument.');
const wasm = capi.wasm;
if(!wasm.bigIntEnabled) toss('BigInt64 support is not enabled.');
const scope = wasm.scopedAllocPush();
let pOut;
try{
const pSize = wasm.scopedAlloc(8/*i64*/ + wasm.ptrSizeof);
const ppOut = pSize + 8;
/**
Maintenance reminder, since this cost a full hour of grief
and confusion: if the order of pSize/ppOut are reversed in
that memory block, fetching the value of pSize after the
export reads a garbage size because it's not on an 8-byte
memory boundary!
*/
wasm.setPtrValue(ppOut, 0);
wasm.setMemValue(pSize, 0, 'i64');
let rc = wasm.exports.sqlite3_wasm_db_serialize(
pDb, ppOut, pSize, 0
);
if(rc){
toss("Database serialization failed with code",
sqlite3.capi.sqlite3_web_rc_str(rc));
}
const pOut = wasm.getPtrValue(ppOut);
const nOut = wasm.getMemValue(pSize, 'i64');
rc = nOut
? wasm.heap8u().slice(pOut, pOut + Number(nOut))
: new Uint8Array();
return rc;
}catch(e){
console.error('internal error?',e);
throw w;
}finally{
if(pOut) wasm.exports.sqlite3_free(pOut);
wasm.scopedAllocPop(scope);
}
};
if( capi.util.isMainWindow() ){
/* Features specific to the main window thread... */
@ -945,7 +990,7 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
}
}
});
return sz * 2 /* because JS uses UC16 encoding */;
return sz * 2 /* because JS uses 2-byte char encoding */;
};
}/* main-window-only bits */