//
// MSG_CompressMinilzo
//
bool MSG_CompressMinilzo (buf_t &buf, size_t start_offset, size_t write_gap)
{
if(buf.size() < MINILZO_COMPRESS_MINPACKETSIZE)
return false;
lzo_uint outlen = OUT_LEN(buf.maxsize() - start_offset - write_gap);
size_t total_len = outlen + start_offset + write_gap;
if(compressed.maxsize() < total_len)
compressed.resize(total_len);
int r = lzo1x_1_compress (buf.ptr() + start_offset,
buf.size() - start_offset,
compressed.ptr() + start_offset + write_gap,
&outlen,
wrkmem);
// worth the effort?
if(r != LZO_E_OK || outlen >= (buf.size() - start_offset - write_gap))
return false;
memcpy(compressed.ptr(), buf.ptr(), start_offset);
SZ_Clear(&buf);
MSG_WriteChunk(&buf, compressed.ptr(), outlen + start_offset + write_gap);
return true;
}
//
// MSG_WriteHexString
//
// Converts a hexidecimal string to its binary representation
void MSG_WriteHexString(buf_t *b, const char *s)
{
byte output[255];
// Nothing to write?
if (!(s && (*s)))
{
MSG_WriteByte(b, 0);
return;
}
const size_t numdigits = strlen(s) / 2;
if (numdigits > STACKARRAY_LENGTH(output))
{
Printf (PRINT_HIGH, "MSG_WriteHexString: too many digits\n");
return;
}
for (size_t i = 0; i < numdigits; ++i)
{
output[i] = (char)(16 * toInt(s[2*i]) + toInt(s[2*i+1]));
}
MSG_WriteByte(b, (byte)numdigits);
MSG_WriteChunk(b, output, numdigits);
}
//
// MSG_CompressAdaptive
//
bool MSG_CompressAdaptive (huffman &huff, buf_t &buf, size_t start_offset, size_t write_gap)
{
size_t outlen = OUT_LEN(buf.maxsize() - start_offset - write_gap);
size_t total_len = outlen + start_offset + write_gap;
if(compressed.maxsize() < total_len)
compressed.resize(total_len);
bool r = huff.compress (buf.ptr() + start_offset,
buf.size() - start_offset,
compressed.ptr() + start_offset + write_gap,
outlen);
// worth the effort?
if(!r || outlen >= (buf.size() - start_offset - write_gap))
return false;
memcpy(compressed.ptr(), buf.ptr(), start_offset);
SZ_Clear(&buf);
MSG_WriteChunk(&buf, compressed.ptr(), outlen + start_offset + write_gap);
return true;
}
