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// Copyright 2009 Daniel Erat <dan@erat.org>
// All rights reserved.
#include "data_reader.h"
#include <arpa/inet.h>
using std::string;
namespace xsettingsd {
DataReader::DataReader(const char* buffer, size_t buf_len)
: buffer_(buffer),
buf_len_(buf_len),
bytes_read_(0),
reverse_bytes_(false) {
}
bool DataReader::ReadBytes(string* out, size_t size) {
if (bytes_read_ + size > buf_len_ ||
bytes_read_ + size < bytes_read_) {
return false;
}
if (out)
out->assign(buffer_ + bytes_read_, size);
bytes_read_ += size;
return true;
}
bool DataReader::ReadInt8(int8_t* out) {
if (bytes_read_ + sizeof(int8_t) > buf_len_ ||
bytes_read_ + sizeof(int8_t) < bytes_read_) {
return false;
}
if (out)
*out = *reinterpret_cast<const int8_t*>(buffer_ + bytes_read_);
bytes_read_ += sizeof(int8_t);
return true;
}
bool DataReader::ReadInt16(int16_t* out) {
if (bytes_read_ + sizeof(int16_t) > buf_len_ ||
bytes_read_ + sizeof(int16_t) < bytes_read_) {
return false;
}
if (out) {
*out = *reinterpret_cast<const int16_t*>(buffer_ + bytes_read_);
if (reverse_bytes_) {
if (IsLittleEndian())
*out = ntohs(*out);
else
*out = htons(*out);
}
}
bytes_read_ += sizeof(int16_t);
return true;
}
bool DataReader::ReadInt32(int32_t* out) {
if (bytes_read_ + sizeof(int32_t) > buf_len_ ||
bytes_read_ + sizeof(int32_t) < bytes_read_) {
return false;
}
if (out) {
*out = *reinterpret_cast<const int32_t*>(buffer_ + bytes_read_);
if (reverse_bytes_) {
if (IsLittleEndian())
*out = ntohl(*out);
else
*out = htonl(*out);
}
}
bytes_read_ += sizeof(int32_t);
return true;
}
} // namespace xsettingsd
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