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barrier/lib/synergy/CProtocolUtil.cpp

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/*
* synergy -- mouse and keyboard sharing utility
* Copyright (C) 2002 Chris Schoeneman
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* found in the file COPYING that should have accompanied this file.
*
* This package is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "CProtocolUtil.h"
#include "IStream.h"
#include "CLog.h"
#include "stdvector.h"
#include <cctype>
#include <cstring>
//
// CProtocolUtil
//
void
CProtocolUtil::writef(IStream* stream, const char* fmt, ...)
{
assert(stream != NULL);
assert(fmt != NULL);
LOG((CLOG_DEBUG2 "writef(%s)", fmt));
va_list args;
va_start(args, fmt);
UInt32 size = getLength(fmt, args);
va_end(args);
va_start(args, fmt);
vwritef(stream, fmt, size, args);
va_end(args);
}
bool
CProtocolUtil::readf(IStream* stream, const char* fmt, ...)
{
assert(stream != NULL);
assert(fmt != NULL);
LOG((CLOG_DEBUG2 "readf(%s)", fmt));
bool result;
va_list args;
va_start(args, fmt);
try {
vreadf(stream, fmt, args);
result = true;
}
catch (XIO&) {
result = false;
}
va_end(args);
return result;
}
void
CProtocolUtil::vwritef(IStream* stream,
const char* fmt, UInt32 size, va_list args)
{
assert(stream != NULL);
assert(fmt != NULL);
// done if nothing to write
if (size == 0) {
return;
}
// fill buffer
// FIXME -- can we use alloca?
UInt8* buffer = new UInt8[size];
writef(buffer, fmt, args);
try {
// write buffer
stream->write(buffer, size);
LOG((CLOG_DEBUG2 "wrote %d bytes", size));
delete[] buffer;
}
catch (XBase&) {
delete[] buffer;
throw;
}
}
bool
CProtocolUtil::vreadf(IStream* stream, const char* fmt, va_list args)
{
assert(stream != NULL);
assert(fmt != NULL);
// begin scanning
while (*fmt) {
if (*fmt == '%') {
// format specifier. determine argument size.
++fmt;
UInt32 len = eatLength(&fmt);
switch (*fmt) {
case 'i': {
// check for valid length
assert(len == 1 || len == 2 || len == 4);
// read the data
UInt8 buffer[4];
read(stream, buffer, len);
// convert it
void* v = va_arg(args, void*);
switch (len) {
case 1:
// 1 byte integer
*reinterpret_cast<UInt8*>(v) = buffer[0];
LOG((CLOG_DEBUG2 "readf: read %d byte integer: %d (0x%x)", len, *reinterpret_cast<UInt8*>(v), *reinterpret_cast<UInt8*>(v)));
break;
case 2:
// 2 byte integer
*reinterpret_cast<UInt16*>(v) =
static_cast<UInt16>(
(static_cast<UInt16>(buffer[0]) << 8) |
static_cast<UInt16>(buffer[1]));
LOG((CLOG_DEBUG2 "readf: read %d byte integer: %d (0x%x)", len, *reinterpret_cast<UInt16*>(v), *reinterpret_cast<UInt16*>(v)));
break;
case 4:
// 4 byte integer
*reinterpret_cast<UInt32*>(v) =
(static_cast<UInt32>(buffer[0]) << 24) |
(static_cast<UInt32>(buffer[1]) << 16) |
(static_cast<UInt32>(buffer[2]) << 8) |
static_cast<UInt32>(buffer[3]);
LOG((CLOG_DEBUG2 "readf: read %d byte integer: %d (0x%x)", len, *reinterpret_cast<UInt32*>(v), *reinterpret_cast<UInt32*>(v)));
break;
}
break;
}
case 'I': {
// check for valid length
assert(len == 1 || len == 2 || len == 4);
// read the vector length
UInt8 buffer[4];
read(stream, buffer, 4);
UInt32 n = (static_cast<UInt32>(buffer[0]) << 24) |
(static_cast<UInt32>(buffer[1]) << 16) |
(static_cast<UInt32>(buffer[2]) << 8) |
static_cast<UInt32>(buffer[3]);
// convert it
void* v = va_arg(args, void*);
switch (len) {
case 1:
// 1 byte integer
for (UInt32 i = 0; i < n; ++i) {
read(stream, buffer, 1);
reinterpret_cast<std::vector<UInt8>*>(v)->push_back(
buffer[0]);
LOG((CLOG_DEBUG2 "readf: read %d byte integer[%d]: %d (0x%x)", len, i, reinterpret_cast<std::vector<UInt8>*>(v)->back(), reinterpret_cast<std::vector<UInt8>*>(v)->back()));
}
break;
case 2:
// 2 byte integer
for (UInt32 i = 0; i < n; ++i) {
read(stream, buffer, 2);
reinterpret_cast<std::vector<UInt16>*>(v)->push_back(
static_cast<UInt16>(
(static_cast<UInt16>(buffer[0]) << 8) |
static_cast<UInt16>(buffer[1])));
LOG((CLOG_DEBUG2 "readf: read %d byte integer[%d]: %d (0x%x)", len, i, reinterpret_cast<std::vector<UInt16>*>(v)->back(), reinterpret_cast<std::vector<UInt16>*>(v)->back()));
}
break;
case 4:
// 4 byte integer
for (UInt32 i = 0; i < n; ++i) {
read(stream, buffer, 4);
reinterpret_cast<std::vector<UInt32>*>(v)->push_back(
(static_cast<UInt32>(buffer[0]) << 24) |
(static_cast<UInt32>(buffer[1]) << 16) |
(static_cast<UInt32>(buffer[2]) << 8) |
static_cast<UInt32>(buffer[3]));
LOG((CLOG_DEBUG2 "readf: read %d byte integer[%d]: %d (0x%x)", len, i, reinterpret_cast<std::vector<UInt32>*>(v)->back(), reinterpret_cast<std::vector<UInt32>*>(v)->back()));
}
break;
}
break;
}
case 's': {
assert(len == 0);
// read the string length
UInt8 buffer[128];
read(stream, buffer, 4);
UInt32 len = (static_cast<UInt32>(buffer[0]) << 24) |
(static_cast<UInt32>(buffer[1]) << 16) |
(static_cast<UInt32>(buffer[2]) << 8) |
static_cast<UInt32>(buffer[3]);
// use a fixed size buffer if its big enough
const bool useFixed = (len <= sizeof(buffer));
// allocate a buffer to read the data
UInt8* sBuffer;
if (useFixed) {
sBuffer = buffer;
}
else {
sBuffer = new UInt8[len];
}
// read the data
try {
read(stream, sBuffer, len);
}
catch (...) {
if (!useFixed) {
delete[] sBuffer;
}
throw;
}
LOG((CLOG_DEBUG2 "readf: read %d byte string: %.*s", len, len, sBuffer));
// save the data
CString* dst = va_arg(args, CString*);
dst->assign((const char*)sBuffer, len);
// release the buffer
if (!useFixed) {
delete[] sBuffer;
}
break;
}
case '%':
assert(len == 0);
break;
default:
assert(0 && "invalid format specifier");
}
// next format character
++fmt;
}
else {
// read next character
char buffer[1];
read(stream, buffer, 1);
// verify match
if (buffer[0] != *fmt) {
LOG((CLOG_DEBUG2 "readf: format mismatch: %c vs %c", *fmt, buffer[0]));
throw XIOReadMismatch();
}
// next format character
++fmt;
}
}
}
UInt32
CProtocolUtil::getLength(const char* fmt, va_list args)
{
UInt32 n = 0;
while (*fmt) {
if (*fmt == '%') {
// format specifier. determine argument size.
++fmt;
UInt32 len = eatLength(&fmt);
switch (*fmt) {
case 'i':
assert(len == 1 || len == 2 || len == 4);
(void)va_arg(args, UInt32);
break;
case 'I':
assert(len == 1 || len == 2 || len == 4);
switch (len) {
case 1:
len = (va_arg(args, std::vector<UInt8>*))->size() + 4;
break;
case 2:
len = 2 * (va_arg(args, std::vector<UInt16>*))->size() + 4;
break;
case 4:
len = 4 * (va_arg(args, std::vector<UInt32>*))->size() + 4;
break;
}
break;
case 's':
assert(len == 0);
len = (va_arg(args, CString*))->size() + 4;
(void)va_arg(args, UInt8*);
break;
case 'S':
assert(len == 0);
len = va_arg(args, UInt32) + 4;
(void)va_arg(args, UInt8*);
break;
case '%':
assert(len == 0);
len = 1;
break;
default:
assert(0 && "invalid format specifier");
}
// accumulate size
n += len;
++fmt;
}
else {
// regular character
++n;
++fmt;
}
}
return n;
}
void
CProtocolUtil::writef(void* buffer, const char* fmt, va_list args)
{
UInt8* dst = reinterpret_cast<UInt8*>(buffer);
while (*fmt) {
if (*fmt == '%') {
// format specifier. determine argument size.
++fmt;
UInt32 len = eatLength(&fmt);
switch (*fmt) {
case 'i': {
const UInt32 v = va_arg(args, UInt32);
switch (len) {
case 1:
// 1 byte integer
*dst++ = static_cast<UInt8>(v & 0xff);
break;
case 2:
// 2 byte integer
*dst++ = static_cast<UInt8>((v >> 8) & 0xff);
*dst++ = static_cast<UInt8>( v & 0xff);
break;
case 4:
// 4 byte integer
*dst++ = static_cast<UInt8>((v >> 24) & 0xff);
*dst++ = static_cast<UInt8>((v >> 16) & 0xff);
*dst++ = static_cast<UInt8>((v >> 8) & 0xff);
*dst++ = static_cast<UInt8>( v & 0xff);
break;
default:
assert(0 && "invalid integer format length");
return;
}
break;
}
case 'I': {
switch (len) {
case 1: {
// 1 byte integers
const std::vector<UInt8>* list =
va_arg(args, const std::vector<UInt8>*);
const UInt32 n = list->size();
*dst++ = static_cast<UInt8>((n >> 24) & 0xff);
*dst++ = static_cast<UInt8>((n >> 16) & 0xff);
*dst++ = static_cast<UInt8>((n >> 8) & 0xff);
*dst++ = static_cast<UInt8>( n & 0xff);
for (UInt32 i = 0; i < n; ++i) {
*dst++ = (*list)[i];
}
break;
}
case 2: {
// 2 byte integers
const std::vector<UInt16>* list =
va_arg(args, const std::vector<UInt16>*);
const UInt32 n = list->size();
*dst++ = static_cast<UInt8>((n >> 24) & 0xff);
*dst++ = static_cast<UInt8>((n >> 16) & 0xff);
*dst++ = static_cast<UInt8>((n >> 8) & 0xff);
*dst++ = static_cast<UInt8>( n & 0xff);
for (UInt32 i = 0; i < n; ++i) {
const UInt16 v = (*list)[i];
*dst++ = static_cast<UInt8>((v >> 8) & 0xff);
*dst++ = static_cast<UInt8>( v & 0xff);
}
break;
}
case 4: {
// 4 byte integers
const std::vector<UInt32>* list =
va_arg(args, const std::vector<UInt32>*);
const UInt32 n = list->size();
*dst++ = static_cast<UInt8>((n >> 24) & 0xff);
*dst++ = static_cast<UInt8>((n >> 16) & 0xff);
*dst++ = static_cast<UInt8>((n >> 8) & 0xff);
*dst++ = static_cast<UInt8>( n & 0xff);
for (UInt32 i = 0; i < n; ++i) {
const UInt32 v = (*list)[i];
*dst++ = static_cast<UInt8>((v >> 24) & 0xff);
*dst++ = static_cast<UInt8>((v >> 16) & 0xff);
*dst++ = static_cast<UInt8>((v >> 8) & 0xff);
*dst++ = static_cast<UInt8>( v & 0xff);
}
break;
}
default:
assert(0 && "invalid integer vector format length");
return;
}
break;
}
case 's': {
assert(len == 0);
const CString* src = va_arg(args, CString*);
const UInt32 len = (src != NULL) ? src->size() : 0;
*dst++ = static_cast<UInt8>((len >> 24) & 0xff);
*dst++ = static_cast<UInt8>((len >> 16) & 0xff);
*dst++ = static_cast<UInt8>((len >> 8) & 0xff);
*dst++ = static_cast<UInt8>( len & 0xff);
if (len != 0) {
memcpy(dst, src->data(), len);
dst += len;
}
break;
}
case 'S': {
assert(len == 0);
const UInt32 len = va_arg(args, UInt32);
const UInt8* src = va_arg(args, UInt8*);
*dst++ = static_cast<UInt8>((len >> 24) & 0xff);
*dst++ = static_cast<UInt8>((len >> 16) & 0xff);
*dst++ = static_cast<UInt8>((len >> 8) & 0xff);
*dst++ = static_cast<UInt8>( len & 0xff);
memcpy(dst, src, len);
dst += len;
break;
}
case '%':
assert(len == 0);
*dst++ = '%';
break;
default:
assert(0 && "invalid format specifier");
}
// next format character
++fmt;
}
else {
// copy regular character
*dst++ = *fmt++;
}
}
}
UInt32
CProtocolUtil::eatLength(const char** pfmt)
{
const char* fmt = *pfmt;
UInt32 n = 0;
for (;;) {
UInt32 d;
switch (*fmt) {
case '0': d = 0; break;
case '1': d = 1; break;
case '2': d = 2; break;
case '3': d = 3; break;
case '4': d = 4; break;
case '5': d = 5; break;
case '6': d = 6; break;
case '7': d = 7; break;
case '8': d = 8; break;
case '9': d = 9; break;
default: *pfmt = fmt; return n;
}
n = 10 * n + d;
++fmt;
}
}
void
CProtocolUtil::read(IStream* stream, void* vbuffer, UInt32 count)
{
assert(stream != NULL);
assert(vbuffer != NULL);
UInt8* buffer = reinterpret_cast<UInt8*>(vbuffer);
while (count > 0) {
// read more
UInt32 n = stream->read(buffer, count);
// bail if stream has hungup
if (n == 0) {
LOG((CLOG_DEBUG2 "unexpected disconnect in readf(), %d bytes left", count));
throw XIOEndOfStream();
}
// prepare for next read
buffer += n;
count -= n;
}
}
//
// XIOReadMismatch
//
CString
XIOReadMismatch::getWhat() const throw()
{
return format("XIOReadMismatch", "CProtocolUtil::readf() mismatch");
}
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