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#include "stream_mqtt.h"
#include <string.h>
int64_t StreamReadMqttString(bstring *buf, Stream *stream)
{
uint16_t len;
bstring result;
if (StreamReadUint16Be(&len, stream) == -1)
return -1;
/* We need 1 extra byte for a NULL terminator. bfromcstralloc doesn't do
any size snapping. */
result = bfromcstralloc(len+1, "");
if (!result)
return -1;
if (StreamRead(bdata(result), len, stream) == -1)
{
bdestroy(result);
return -1;
}
result->slen = len;
result->data[len] = '\0';
*buf = result;
return len+2;
}
int64_t StreamWriteMqttString(const_bstring buf, Stream *stream)
{
if (StreamWriteUint16Be(blength(buf), stream) == -1)
return -1;
if (StreamWrite(bdata(buf), blength(buf), stream) == -1)
return -1;
return 2 + blength(buf);
}
int64_t StreamReadRemainingLength(size_t *remainingLength, Stream *stream)
{
size_t multiplier = 1;
unsigned char encodedByte;
*remainingLength = 0;
do
{
if (StreamRead(&encodedByte, 1, stream) != 1)
return -1;
*remainingLength += (encodedByte & 127) * multiplier;
if (multiplier > 128*128*128)
return -1;
multiplier *= 128;
}
while ((encodedByte & 128) != 0);
return 0;
}
int64_t StreamWriteRemainingLength(size_t remainingLength, Stream *stream)
{
size_t nbytes = 0;
do
{
unsigned char encodedByte = remainingLength % 128;
remainingLength /= 128;
if (remainingLength > 0)
encodedByte |= 128;
if (StreamWrite(&encodedByte, 1, stream) != 1)
return -1;
++nbytes;
}
while (remainingLength > 0);
return nbytes;
}
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