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#include "stream_mqtt.h"
#include "stringbuf.h"
#include <string.h>
int64_t StreamReadMqttString(char **s, size_t *len, Stream *stream)
{
StringBuf buf;
int64_t rv;
if ((rv = StreamReadMqttStringBuf(&buf, stream)) == -1)
return -1;
*s = buf.data;
*len = buf.len;
return rv;
}
int64_t StreamWriteMqttString(const char *s, int len, Stream *stream)
{
StringBuf buf;
if (len < 0)
len = strlen(s);
buf.data = (char *) s;
buf.len = len;
return StreamWriteMqttStringBuf(&buf, stream);
}
int64_t StreamReadMqttStringBuf(struct StringBuf *buf, Stream *stream)
{
uint16_t len;
if (StreamReadUint16Be(&len, stream) == -1)
return -1;
if (StringBufInit(buf, len) == -1)
return -1;
if (StreamRead(buf->data, len, stream) == -1)
{
StringBufDeinit(buf);
return -1;
}
buf->len = len;
return len+2;
}
int64_t StreamWriteMqttStringBuf(const struct StringBuf *buf, Stream *stream)
{
if (StreamWriteUint16Be(buf->len, stream) == -1)
return -1;
if (StreamWrite(buf->data, buf->len, stream) == -1)
return -1;
return 2 + buf->len;
}
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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