cef/libcef_dll/wrapper/cef_byte_read_handler.cc

70 lines
1.7 KiB
C++

// Copyright (c) 2010 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 "include/wrapper/cef_byte_read_handler.h"
#include <algorithm>
#include <cstdio>
#include <cstdlib>
CefByteReadHandler::CefByteReadHandler(const unsigned char* bytes,
size_t size,
CefRefPtr<CefBaseRefCounted> source)
: bytes_(bytes), size_(size), offset_(0), source_(source) {}
size_t CefByteReadHandler::Read(void* ptr, size_t size, size_t n) {
base::AutoLock lock_scope(lock_);
size_t s = static_cast<size_t>(size_ - offset_) / size;
size_t ret = std::min(n, s);
memcpy(ptr, bytes_ + offset_, ret * size);
offset_ += ret * size;
return ret;
}
int CefByteReadHandler::Seek(int64 offset, int whence) {
int rv = -1L;
base::AutoLock lock_scope(lock_);
switch (whence) {
case SEEK_CUR:
if (offset_ + offset > size_ || offset_ + offset < 0) {
break;
}
offset_ += offset;
rv = 0;
break;
case SEEK_END: {
#if defined(OS_WIN)
int64 offset_abs = _abs64(offset);
#else
int64 offset_abs = std::abs(offset);
#endif
if (offset_abs > size_) {
break;
}
offset_ = size_ - offset_abs;
rv = 0;
break;
}
case SEEK_SET:
if (offset > size_ || offset < 0) {
break;
}
offset_ = offset;
rv = 0;
break;
}
return rv;
}
int64 CefByteReadHandler::Tell() {
base::AutoLock lock_scope(lock_);
return offset_;
}
int CefByteReadHandler::Eof() {
base::AutoLock lock_scope(lock_);
return (offset_ >= size_);
}