C++ - zlib uncompress function crashes program - c++

Question

I should note that this program is adhering (at least, trying to) to the Tiled API.
I'm trying to use the uncompress() function in zlib, but for some reason my program crashes whenever I call the function. This is what I have, and all of the parameters look right, so I'm not really sure what the problem is.
// const char* filedata passed in function is Zlib compressed and Base64 encoded
uLong inLen = static_cast<uLong>((strlen(filedata)*6)/8); // Calculate the length
std::string inBuffer = BASE64_DECODE(filedata); // My data
uLongf outLen = static_cast<uLongf>(width*height*4); // Tiled API specification
Bytef* outBuffer = new Bytef(outLen); // Destination
int ret = uncompress(outBuffer, &outLen,
reinterpret_cast<Bytef*>(&inBuffer[0]), inLen);
ret returns nothing, the program crashes. Does anybody have any ideas? Here is the BASE64_DECODE function:
std::string BASE64_DECODE(std::string const& encoded_string)
{
int in_len = encoded_string.size();
int i = 0;
int j = 0;
int in_ = 0;
unsigned char char_array_4[4], char_array_3[3];
std::string ret;
while(in_len-- && ( encoded_string[in_] != '=') && is_base64(encoded_string[in_]))
{
char_array_4[i++] = encoded_string[in_]; in_++;
if (i == 4)
{
for (i = 0; i <4; i++)
char_array_4[i] = base64_chars.find(char_array_4[i]);
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (i = 0; (i < 3); i++)
ret += char_array_3[i];
i = 0;
}
}
if(i)
{
for (j = i; j <4; j++)
char_array_4[j] = 0;
for (j = 0; j <4; j++)
char_array_4[j] = base64_chars.find(char_array_4[j]);
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
for (j = 0; (j < i - 1); j++) ret += char_array_3[j];
}
return ret;
}
EDIT: If you're looking at this in the future, make sure you delete the outBuffer variable later in the program to prevent memory leaks.

Answer 1

Bytef isn't used with a constructor that takes a length argument. You probably meant Bytef* outBuffer = new Bytef[outLen]; (square brackets).
I think Bytef is usually typedef-ed to some primitive type anyway, so using it is analogous to something like new int[len] or new uint64_t[len].