Remove CFX_BufferSeekableReadStream.

Replace it with CFX_ReadOnlyMemoryStream, which does the same thing.
Take some checks from CFX_BufferSeekableReadStream and add them
CFX_ReadOnlyMemoryStream.

Change-Id: I25554c3aec3ec96967f8df16ca68a64dba121b6f
Reviewed-on: https://pdfium-review.googlesource.com/40070
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

1 files changed, 0 insertions, 21 deletions

diff --git a/testing/fx_string_testhelpers.cpp b/testing/fx_string_testhelpers.cpp
index e3c443ac4e..96f2c64535 100644
--- a/testing/fx_string_testhelpers.cpp
+++ b/testing/fx_string_testhelpers.cpp
@@ -22,24 +22,3 @@ CFX_InvalidSeekableReadStream::CFX_InvalidSeekableReadStream(
     : data_size_(data_size) {}
 
 CFX_InvalidSeekableReadStream::~CFX_InvalidSeekableReadStream() = default;
-
-CFX_BufferSeekableReadStream::CFX_BufferSeekableReadStream(
-    pdfium::span<const uint8_t> data)
-    : data_(data) {}
-
-CFX_BufferSeekableReadStream::~CFX_BufferSeekableReadStream() = default;
-
-bool CFX_BufferSeekableReadStream::ReadBlock(void* buffer,
-                                             FX_FILESIZE offset,
-                                             size_t size) {
-  if (offset < 0 || static_cast<size_t>(offset) >= data_.size())
-    return false;
-
-  if (static_cast<size_t>(offset) + size > data_.size())
-    size = data_.size() - static_cast<size_t>(offset);
-  if (size == 0)
-    return false;
-
-  memcpy(buffer, &data_[offset], size);
-  return true;
-}