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LibPDF: Add support for stream filters

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This commit also splits up StreamObject into PlainTextStreamObject and
EncodedStreamObject, which is essentially just a stream object which
does not own its bytes vs one which does.
This commit is contained in:
Matthew Olsson 2021-05-22 20:44:18 -07:00 • committed by Ali Mohammad Pur
parent 97cc482087
commit 477e3946e5
6 changed files with 253 additions and 7 deletions
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40
Userland/Libraries/LibPDF/Object.h
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@ -147,18 +147,17 @@ private:
HashMap<FlyString, Value> m_map;
};
class StreamObject final : public Object {
class StreamObject : public Object {
public:
StreamObject(const NonnullRefPtr<DictObject>& dict, const ReadonlyBytes& bytes)
explicit StreamObject(const NonnullRefPtr<DictObject>& dict)
: m_dict(dict)
, m_bytes(bytes)
{
}
~StreamObject() override = default;
virtual ~StreamObject() override = default;
[[nodiscard]] ALWAYS_INLINE NonnullRefPtr<DictObject> dict() const { return m_dict; }
[[nodiscard]] ALWAYS_INLINE const ReadonlyBytes& bytes() const { return m_bytes; }
[[nodiscard]] virtual ReadonlyBytes bytes() const = 0;
ALWAYS_INLINE bool is_stream() const override { return true; }
ALWAYS_INLINE const char* type_name() const override { return "stream"; }
@ -166,9 +165,40 @@ public:
private:
NonnullRefPtr<DictObject> m_dict;
};
class PlainTextStreamObject final : public StreamObject {
public:
PlainTextStreamObject(const NonnullRefPtr<DictObject>& dict, const ReadonlyBytes& bytes)
: StreamObject(dict)
, m_bytes(bytes)
{
}
virtual ~PlainTextStreamObject() override = default;
[[nodiscard]] ALWAYS_INLINE virtual ReadonlyBytes bytes() const override { return m_bytes; }
private:
ReadonlyBytes m_bytes;
};
class EncodedStreamObject final : public StreamObject {
public:
EncodedStreamObject(const NonnullRefPtr<DictObject>& dict, ByteBuffer&& buffer)
: StreamObject(dict)
, m_buffer(buffer)
{
}
virtual ~EncodedStreamObject() override = default;
[[nodiscard]] ALWAYS_INLINE virtual ReadonlyBytes bytes() const override { return m_buffer.bytes(); }
private:
ByteBuffer m_buffer;
};
class IndirectValue final : public Object {
public:
IndirectValue(u32 index, u32 generation_index, const Value& value)