cef/cef1/libcef_dll/wrapper/cef_byte_read_handler.cc

61 lines
1.5 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 <stdlib.h>
#include "libcef_dll/cef_logging.h"
CefByteReadHandler::CefByteReadHandler(const unsigned char* bytes, size_t size,
CefRefPtr<CefBase> source)
: bytes_(bytes), size_(size), offset_(0), source_(source) {
}
size_t CefByteReadHandler::Read(void* ptr, size_t size, size_t n) {
AutoLock lock_scope(this);
size_t s = (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;
AutoLock lock_scope(this);
switch (whence) {
case SEEK_CUR:
if (offset_ + offset > size_ || offset_ + offset < 0)
break;
offset_ += offset;
rv = 0;
break;
case SEEK_END: {
int64 offset_abs = abs(offset);
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() {
AutoLock lock_scope(this);
return offset_;
}
int CefByteReadHandler::Eof() {
AutoLock lock_scope(this);
return (offset_ >= size_);
}