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Add Gzip support to Inflate/Deflate #117

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Add Gzip support to Inflate/Deflate #117

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b7ee238
Add Gzip support to Inflate/Deflate
vaisest Sep 7, 2026
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vaisest Sep 7, 2026
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8 changes: 6 additions & 2 deletions ui_api.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1609,10 +1609,13 @@ static int l_Deflate(lua_State* L)
int n = lua_gettop(L);
ui->LAssert(L, n >= 1, "Usage: Deflate(string)");
ui->LAssert(L, lua_isstring(L, 1), "Deflate() argument 1: expected string, got %s", luaL_typename(L, 1));
ui->LAssert(L, lua_isboolean(L, 2) || lua_isnil(L, 2) || lua_isnone(L, 2), "Deflate() argument 2: expected boolean or nil, got %s", luaL_typename(L, 2));
bool isGzip = lua_toboolean(L, 2);
z_stream_s z;
z.zalloc = NULL;
z.zfree = NULL;
deflateInit(&z, 9);
// Adding 16 enables Gzip headers instead of ZLib headers
deflateInit2(&z, Z_BEST_COMPRESSION, Z_DEFLATED, MAX_WBITS + (isGzip ? 16 : 0), 8, Z_DEFAULT_STRATEGY);
size_t inLen;
byte* in = (byte*)lua_tolstring(L, 1, &inLen);
// Prevent deflation of input data larger than 128 MiB.
Expand Down Expand Up @@ -1666,7 +1669,8 @@ static int l_Inflate(lua_State* L)
z.zfree = NULL;
z.next_out = out.data();
z.avail_out = outSz;
inflateInit(&z);
// Adding 32 enables automatic detection of headers
inflateInit2(&z, MAX_WBITS + 32);
int err;
while ((err = inflate(&z, Z_NO_FLUSH)) == Z_OK) {
// Output buffer filled, try to embiggen it.
Expand Down
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