cef/tests/cefclient/bytes_write_handler.cpp

95 lines
1.9 KiB
C++

// Copyright (c) 2014 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.
#include "cefclient/bytes_write_handler.h"
#include <cstdio>
#include <cstdlib>
#include "include/wrapper/cef_helpers.h"
BytesWriteHandler::BytesWriteHandler(size_t grow)
: grow_(grow),
datasize_(grow),
offset_(0) {
DCHECK_GT(grow, 0U);
data_ = malloc(grow);
DCHECK(data_ != NULL);
}
BytesWriteHandler::~BytesWriteHandler() {
if (data_)
free(data_);
}
size_t BytesWriteHandler::Write(const void* ptr, size_t size, size_t n) {
base::AutoLock lock_scope(lock_);
size_t rv;
if (offset_ + static_cast<int64>(size * n) >= datasize_ &&
Grow(size * n) == 0) {
rv = 0;
} else {
memcpy(reinterpret_cast<char*>(data_) + offset_, ptr, size * n);
offset_ += size * n;
rv = n;
}
return rv;
}
int BytesWriteHandler::Seek(int64 offset, int whence) {
int rv = -1L;
base::AutoLock lock_scope(lock_);
switch (whence) {
case SEEK_CUR:
if (offset_ + offset > datasize_ || offset_ + offset < 0)
break;
offset_ += offset;
rv = 0;
break;
case SEEK_END: {
int64 offset_abs = std::abs(offset);
if (offset_abs > datasize_)
break;
offset_ = datasize_ - offset_abs;
rv = 0;
break;
}
case SEEK_SET:
if (offset > datasize_ || offset < 0)
break;
offset_ = offset;
rv = 0;
break;
}
return rv;
}
int64 BytesWriteHandler::Tell() {
base::AutoLock lock_scope(lock_);
return offset_;
}
int BytesWriteHandler::Flush() {
return 0;
}
size_t BytesWriteHandler::Grow(size_t size) {
base::AutoLock lock_scope(lock_);
size_t rv;
size_t s = (size > grow_ ? size : grow_);
void* tmp = realloc(data_, datasize_ + s);
DCHECK(tmp != NULL);
if (tmp) {
data_ = tmp;
datasize_ += s;
rv = datasize_;
} else {
rv = 0;
}
return rv;
}