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-rw-r--r--core/fxcrt/bytestring.cpp36
-rw-r--r--core/fxcrt/bytestring.h6
-rw-r--r--core/fxcrt/bytestring_unittest.cpp21
-rw-r--r--core/fxcrt/widestring.cpp21
4 files changed, 49 insertions, 35 deletions
diff --git a/core/fxcrt/bytestring.cpp b/core/fxcrt/bytestring.cpp
index f5687c591e..872de065ba 100644
--- a/core/fxcrt/bytestring.cpp
+++ b/core/fxcrt/bytestring.cpp
@@ -18,6 +18,7 @@
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxcrt/string_pool_template.h"
#include "third_party/base/numerics/safe_math.h"
+#include "third_party/base/span.h"
#include "third_party/base/stl_util.h"
template class fxcrt::StringDataTemplate<char>;
@@ -81,9 +82,12 @@ ByteString GetByteString(uint16_t codepage, const WideStringView& wstr) {
return ByteString();
ByteString bstr;
- char* dest_buf = bstr.GetBuffer(dest_len);
- FXSYS_WideCharToMultiByte(codepage, 0, wstr.unterminated_c_str(), src_len,
- dest_buf, dest_len, nullptr, nullptr);
+ {
+ // Span's lifetime must end before ReleaseBuffer() below.
+ pdfium::span<char> dest_buf = bstr.GetBuffer(dest_len);
+ FXSYS_WideCharToMultiByte(codepage, 0, wstr.unterminated_c_str(), src_len,
+ dest_buf.data(), dest_len, nullptr, nullptr);
+ }
bstr.ReleaseBuffer(dest_len);
return bstr;
}
@@ -120,19 +124,21 @@ ByteString ByteString::FormatV(const char* pFormat, va_list argList) {
va_end(argListCopy);
if (nMaxLen <= 0)
- return "";
+ return ByteString();
ByteString ret;
- char* buf = ret.GetBuffer(nMaxLen);
- if (buf) {
+ {
+ // Span's lifetime must end before ReleaseBuffer() below.
+ pdfium::span<char> buf = ret.GetBuffer(nMaxLen);
+
// In the following two calls, there's always space in the buffer for
// a terminating NUL that's not included in nMaxLen.
- memset(buf, 0, nMaxLen + 1);
+ memset(buf.data(), 0, nMaxLen + 1);
va_copy(argListCopy, argList);
- vsnprintf(buf, nMaxLen + 1, pFormat, argListCopy);
+ vsnprintf(buf.data(), nMaxLen + 1, pFormat, argListCopy);
va_end(argListCopy);
- ret.ReleaseBuffer(ret.GetStringLength());
}
+ ret.ReleaseBuffer(ret.GetStringLength());
return ret;
}
@@ -419,29 +425,29 @@ void ByteString::Reserve(size_t len) {
GetBuffer(len);
}
-char* ByteString::GetBuffer(size_t nMinBufLength) {
+pdfium::span<char> ByteString::GetBuffer(size_t nMinBufLength) {
if (!m_pData) {
if (nMinBufLength == 0)
- return nullptr;
+ return pdfium::span<char>();
m_pData.Reset(StringData::Create(nMinBufLength));
m_pData->m_nDataLength = 0;
m_pData->m_String[0] = 0;
- return m_pData->m_String;
+ return pdfium::span<char>(m_pData->m_String, m_pData->m_nAllocLength);
}
if (m_pData->CanOperateInPlace(nMinBufLength))
- return m_pData->m_String;
+ return pdfium::span<char>(m_pData->m_String, m_pData->m_nAllocLength);
nMinBufLength = std::max(nMinBufLength, m_pData->m_nDataLength);
if (nMinBufLength == 0)
- return nullptr;
+ return pdfium::span<char>();
RetainPtr<StringData> pNewData(StringData::Create(nMinBufLength));
pNewData->CopyContents(*m_pData);
pNewData->m_nDataLength = m_pData->m_nDataLength;
m_pData.Swap(pNewData);
- return m_pData->m_String;
+ return pdfium::span<char>(m_pData->m_String, m_pData->m_nAllocLength);
}
size_t ByteString::Delete(size_t index, size_t count) {
diff --git a/core/fxcrt/bytestring.h b/core/fxcrt/bytestring.h
index ccb539b2ef..247238573d 100644
--- a/core/fxcrt/bytestring.h
+++ b/core/fxcrt/bytestring.h
@@ -17,6 +17,7 @@
#include "core/fxcrt/string_data_template.h"
#include "core/fxcrt/string_view_template.h"
#include "third_party/base/optional.h"
+#include "third_party/base/span.h"
namespace fxcrt {
@@ -153,7 +154,10 @@ class ByteString {
size_t Delete(size_t index, size_t count = 1);
void Reserve(size_t len);
- char* GetBuffer(size_t len);
+
+ // Note: any modification of the string (including ReleaseBuffer()) may
+ // invalidate the span, which must not outlive its buffer.
+ pdfium::span<char> GetBuffer(size_t len);
void ReleaseBuffer(size_t len);
ByteString Mid(size_t first, size_t count) const;
diff --git a/core/fxcrt/bytestring_unittest.cpp b/core/fxcrt/bytestring_unittest.cpp
index f7e1559af9..d030535edd 100644
--- a/core/fxcrt/bytestring_unittest.cpp
+++ b/core/fxcrt/bytestring_unittest.cpp
@@ -843,22 +843,23 @@ TEST(ByteString, Reserve) {
}
TEST(ByteString, GetBuffer) {
+ ByteString str1;
{
- ByteString str;
- char* buffer = str.GetBuffer(12);
+ pdfium::span<char> buffer = str1.GetBuffer(12);
// NOLINTNEXTLINE(runtime/printf)
- strcpy(buffer, "clams");
- str.ReleaseBuffer(str.GetStringLength());
- EXPECT_EQ("clams", str);
+ strcpy(buffer.data(), "clams");
}
+ str1.ReleaseBuffer(str1.GetStringLength());
+ EXPECT_EQ("clams", str1);
+
+ ByteString str2("cl");
{
- ByteString str("cl");
- char* buffer = str.GetBuffer(12);
+ pdfium::span<char> buffer = str2.GetBuffer(12);
// NOLINTNEXTLINE(runtime/printf)
- strcpy(buffer + 2, "ams");
- str.ReleaseBuffer(str.GetStringLength());
- EXPECT_EQ("clams", str);
+ strcpy(&buffer[2], "ams");
}
+ str2.ReleaseBuffer(str2.GetStringLength());
+ EXPECT_EQ("clams", str2);
}
TEST(ByteString, ReleaseBuffer) {
diff --git a/core/fxcrt/widestring.cpp b/core/fxcrt/widestring.cpp
index a3525593ee..25f253ea11 100644
--- a/core/fxcrt/widestring.cpp
+++ b/core/fxcrt/widestring.cpp
@@ -667,18 +667,21 @@ ByteString WideString::UTF8Encode() const {
}
ByteString WideString::UTF16LE_Encode() const {
- if (!m_pData) {
+ if (!m_pData)
return ByteString("\0\0", 2);
- }
- int len = m_pData->m_nDataLength;
+
ByteString result;
- char* buffer = result.GetBuffer(len * 2 + 2);
- for (int i = 0; i < len; i++) {
- buffer[i * 2] = m_pData->m_String[i] & 0xff;
- buffer[i * 2 + 1] = m_pData->m_String[i] >> 8;
+ int len = m_pData->m_nDataLength;
+ {
+ // Span's lifetime must end before ReleaseBuffer() below.
+ pdfium::span<char> buffer = result.GetBuffer(len * 2 + 2);
+ for (int i = 0; i < len; i++) {
+ buffer[i * 2] = m_pData->m_String[i] & 0xff;
+ buffer[i * 2 + 1] = m_pData->m_String[i] >> 8;
+ }
+ buffer[len * 2] = 0;
+ buffer[len * 2 + 1] = 0;
}
- buffer[len * 2] = 0;
- buffer[len * 2 + 1] = 0;
result.ReleaseBuffer(len * 2 + 2);
return result;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 00:44:52 +0000