65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
// Copyright (c) 2010 The Chromium Embedded Framework Authors. All rights
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// reserved. Use of this source code is governed by a BSD-style license that
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// can be found in the LICENSE file.
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#include "include/wrapper/cef_byte_read_handler.h"
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#include <stdlib.h>
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#include "libcef_dll/cef_logging.h"
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CefByteReadHandler::CefByteReadHandler(const unsigned char* bytes, size_t size,
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CefRefPtr<CefBase> source)
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: bytes_(bytes), size_(size), offset_(0), source_(source) {
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}
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size_t CefByteReadHandler::Read(void* ptr, size_t size, size_t n) {
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AutoLock lock_scope(this);
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size_t s = static_cast<size_t>(size_ - offset_) / size;
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size_t ret = std::min(n, s);
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memcpy(ptr, bytes_ + offset_, ret * size);
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offset_ += ret * size;
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return ret;
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}
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int CefByteReadHandler::Seek(int64 offset, int whence) {
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int rv = -1L;
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AutoLock lock_scope(this);
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switch (whence) {
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case SEEK_CUR:
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if (offset_ + offset > size_ || offset_ + offset < 0)
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break;
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offset_ += offset;
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rv = 0;
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break;
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case SEEK_END: {
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#if defined(OS_WIN)
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int64 offset_abs = _abs64(offset);
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#else
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int64 offset_abs = abs(offset);
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#endif
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if (offset_abs > size_)
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break;
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offset_ = size_ - offset_abs;
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rv = 0;
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break;
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}
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case SEEK_SET:
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if (offset > size_ || offset < 0)
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break;
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offset_ = offset;
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rv = 0;
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break;
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}
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return rv;
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}
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int64 CefByteReadHandler::Tell() {
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AutoLock lock_scope(this);
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return offset_;
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}
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int CefByteReadHandler::Eof() {
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AutoLock lock_scope(this);
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return (offset_ >= size_);
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}
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