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diff --git a/src/preview.cpp b/src/preview.cpp
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index 69f8e01..d20de04 100644
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--- a/src/preview.cpp
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+++ b/src/preview.cpp
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@@ -37,6 +37,7 @@ EXIV2_RCSID("@(#) $Id$")
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#include "preview.hpp"
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#include "futils.hpp"
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#include "enforce.hpp"
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+#include "safe_op.hpp"
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#include "image.hpp"
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#include "cr2image.hpp"
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@@ -386,7 +387,7 @@ namespace {
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return AutoPtr();
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if (loaderList_[id].imageMimeType_ &&
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- std::string(loaderList_[id].imageMimeType_) != std::string(image.mimeType()))
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+ std::string(loaderList_[id].imageMimeType_) != image.mimeType())
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return AutoPtr();
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AutoPtr loader = loaderList_[id].create_(id, image, loaderList_[id].parIdx_);
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@@ -548,7 +549,8 @@ namespace {
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}
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}
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- if (offset_ + size_ > static_cast<uint32_t>(image_.io().size())) return;
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+ if (Safe::add(offset_, size_) > static_cast<uint32_t>(image_.io().size()))
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+ return;
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valid_ = true;
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}
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@@ -802,7 +804,7 @@ namespace {
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// this saves one copying of the buffer
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uint32_t offset = dataValue.toLong(0);
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uint32_t size = sizes.toLong(0);
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- if (offset + size <= static_cast<uint32_t>(io.size()))
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+ if (Safe::add(offset, size) <= static_cast<uint32_t>(io.size()))
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dataValue.setDataArea(base + offset, size);
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}
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else {
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@@ -812,8 +814,8 @@ namespace {
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for (int i = 0; i < sizes.count(); i++) {
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uint32_t offset = dataValue.toLong(i);
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uint32_t size = sizes.toLong(i);
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- enforce(idxBuf + size < size_, kerCorruptedMetadata);
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- if (size!=0 && offset + size <= static_cast<uint32_t>(io.size()))
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+ enforce(Safe::add(idxBuf, size) < size_, kerCorruptedMetadata);
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+ if (size!=0 && Safe::add(offset, size) <= static_cast<uint32_t>(io.size()))
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memcpy(&buf.pData_[idxBuf], base + offset, size);
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idxBuf += size;
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}
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@@ -930,7 +932,7 @@ namespace {
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DataBuf decodeBase64(const std::string& src)
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{
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- const unsigned long srcSize = static_cast<const unsigned long>(src.size());
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+ const unsigned long srcSize = src.size();
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// create decoding table
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unsigned long invalid = 64;
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