feat(puffin): add puffin file reader and writer

src/iceberg/CMakeLists.txt

@@ -175,7 +175,9 @@ set(ICEBERG_DATA_SOURCES
     deletes/roaring_position_bitmap.cc
     puffin/file_metadata.cc
     puffin/json_serde.cc
-    puffin/puffin_format.cc)
+    puffin/puffin_format.cc
+    puffin/puffin_reader.cc
+    puffin/puffin_writer.cc)
 
 set(ICEBERG_DATA_STATIC_BUILD_INTERFACE_LIBS)
 set(ICEBERG_DATA_SHARED_BUILD_INTERFACE_LIBS)

src/iceberg/meson.build

@@ -157,6 +157,8 @@ iceberg_data_sources = files(
     'puffin/file_metadata.cc',
     'puffin/json_serde.cc',
     'puffin/puffin_format.cc',
+    'puffin/puffin_reader.cc',
+    'puffin/puffin_writer.cc',
 )
 
 # CRoaring does not export symbols, so on Windows it must

src/iceberg/puffin/meson.build

@@ -16,6 +16,12 @@
 # under the License.
 
 install_headers(
-    ['file_metadata.h', 'puffin_format.h', 'type_fwd.h'],
+    [
+        'file_metadata.h',
+        'puffin_format.h',
+        'puffin_reader.h',
+        'puffin_writer.h',
+        'type_fwd.h',
+    ],
     subdir: 'iceberg/puffin',
 )

src/iceberg/puffin/puffin_format.cc

@@ -36,6 +36,18 @@ constexpr std::pair<int, int> GetFlagPosition(PuffinFlag flag) {
   std::unreachable();
 }
 
+}  // namespace
+
+bool IsFlagSet(std::span<const uint8_t, 4> flags, PuffinFlag flag) {
+  auto [byte_num, bit_num] = GetFlagPosition(flag);
+  return (flags[byte_num] & (1 << bit_num)) != 0;
+}
+
+void SetFlag(std::span<uint8_t, 4> flags, PuffinFlag flag) {
+  auto [byte_num, bit_num] = GetFlagPosition(flag);
+  flags[byte_num] |= (1 << bit_num);
+}
+
 // TODO(zhaoxuan1994): Move compression logic to a unified codec interface.
 Result<std::vector<std::byte>> Compress(PuffinCompressionCodec codec,
                                         std::span<const std::byte> input) {
@@ -63,16 +75,4 @@ Result<std::vector<std::byte>> Decompress(PuffinCompressionCodec codec,
   std::unreachable();
 }
 
-}  // namespace
-
-bool IsFlagSet(std::span<const uint8_t, 4> flags, PuffinFlag flag) {
-  auto [byte_num, bit_num] = GetFlagPosition(flag);
-  return (flags[byte_num] & (1 << bit_num)) != 0;
-}
-
-void SetFlag(std::span<uint8_t, 4> flags, PuffinFlag flag) {
-  auto [byte_num, bit_num] = GetFlagPosition(flag);
-  flags[byte_num] |= (1 << bit_num);
-}
-
 }  // namespace iceberg::puffin

src/iceberg/puffin/puffin_format.h

@@ -23,8 +23,10 @@
 /// Puffin file format constants and utilities.
 
 #include <array>
+#include <cstddef>
 #include <cstdint>
 #include <span>
+#include <vector>
 
 #include "iceberg/iceberg_data_export.h"
 #include "iceberg/puffin/file_metadata.h"
@@ -66,4 +68,12 @@ ICEBERG_DATA_EXPORT bool IsFlagSet(std::span<const uint8_t, 4> flags, PuffinFlag
 /// \brief Set a flag in the flags bytes.
 ICEBERG_DATA_EXPORT void SetFlag(std::span<uint8_t, 4> flags, PuffinFlag flag);
 
+/// \brief Compress data using the specified codec.
+ICEBERG_DATA_EXPORT Result<std::vector<std::byte>> Compress(
+    PuffinCompressionCodec codec, std::span<const std::byte> input);
+
+/// \brief Decompress data using the specified codec.
+ICEBERG_DATA_EXPORT Result<std::vector<std::byte>> Decompress(
+    PuffinCompressionCodec codec, std::span<const std::byte> input);
+
 }  // namespace iceberg::puffin

src/iceberg/puffin/puffin_reader.cc

@@ -0,0 +1,271 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#include "iceberg/puffin/puffin_reader.h"
+
+#include <algorithm>
+#include <array>
+#include <cstdint>
+#include <cstring>
+#include <limits>
+#include <span>
+#include <string_view>
+
+#include "iceberg/file_io.h"
+#include "iceberg/puffin/json_serde_internal.h"
+#include "iceberg/puffin/puffin_format.h"
+#include "iceberg/util/endian.h"
+#include "iceberg/util/macros.h"
+
+namespace iceberg::puffin {
+
+namespace {
+
+struct FooterInfo {
+  int32_t payload_size;
+  PuffinCompressionCodec compression;
+};
+
+Status CheckMagic(std::span<const std::byte> data, int64_t offset = 0) {
+  ICEBERG_PRECHECK(offset >= 0, "Invalid file: magic offset {} is negative", offset);
+  auto offset_size = static_cast<size_t>(offset);
+  ICEBERG_PRECHECK(offset_size <= data.size() &&
+                       data.size() - offset_size >= PuffinFormat::kMagicLength,
+                   "Invalid file: buffer too small for magic at offset {}", offset);
+  auto* begin = reinterpret_cast<const uint8_t*>(data.data() + offset_size);
+  ICEBERG_PRECHECK(
+      std::equal(PuffinFormat::kMagicV1.cbegin(), PuffinFormat::kMagicV1.cend(), begin),
+      "Invalid file: expected magic at offset {}, got [{:#04x}, {:#04x}, {:#04x}, "
+      "{:#04x}]",
+      offset, begin[0], begin[1], begin[2], begin[3]);
+  return {};
+}
+
+Status CheckUnknownFlags(std::span<const uint8_t, 4> flags) {
+  constexpr uint8_t kKnownBitsMask = 0x01;
+  ICEBERG_PRECHECK(
+      (flags[0] & ~kKnownBitsMask) == 0 && flags[1] == 0 && flags[2] == 0 &&
+          flags[3] == 0,
+      "Invalid file: unknown footer flags set [{:#04x}, {:#04x}, {:#04x}, {:#04x}]",
+      flags[0], flags[1], flags[2], flags[3]);
+  return {};
+}
+
+Result<int32_t> FooterPayloadSize(std::span<const std::byte> footer_struct) {
+  ICEBERG_PRECHECK(footer_struct.size() >= PuffinFormat::kFooterStructLength,
+                   "Invalid file: footer struct is too small");
+  auto payload_size = ReadLittleEndian<int32_t>(
+      footer_struct.data() + PuffinFormat::kFooterStructPayloadSizeOffset);
+  ICEBERG_PRECHECK(payload_size >= 0, "Invalid file: negative payload size {}",
+                   payload_size);
+  return payload_size;
+}
+
+Result<std::array<uint8_t, 4>> DecodeFlags(std::span<const std::byte> footer_struct) {
+  ICEBERG_PRECHECK(footer_struct.size() >= PuffinFormat::kFooterStructLength,
+                   "Invalid file: footer struct is too small");
+  std::array<uint8_t, 4> flags{};
+  std::memcpy(flags.data(), footer_struct.data() + PuffinFormat::kFooterStructFlagsOffset,
+              flags.size());
+  ICEBERG_RETURN_UNEXPECTED(CheckUnknownFlags(flags));
+  return flags;
+}
+
+PuffinCompressionCodec FooterCompressionCodec(std::span<const uint8_t, 4> flags) {
+  if (IsFlagSet(flags, PuffinFlag::kFooterPayloadCompressed)) {
+    return PuffinFormat::kDefaultFooterCompressionCodec;
+  }
+  return PuffinCompressionCodec::kNone;
+}
+
+Status CheckFooterSize(int64_t footer_size, int32_t payload_size) {
+  auto expected_footer_size = PuffinFormat::kFooterStartMagicLength +
+                              static_cast<int64_t>(payload_size) +
+                              PuffinFormat::kFooterStructLength;
+  ICEBERG_PRECHECK(footer_size == expected_footer_size,
+                   "Invalid file: footer size {} does not match payload size {}",
+                   footer_size, payload_size);
+  return {};
+}
+
+Result<FooterInfo> DecodeFooterInfo(std::span<const std::byte> footer,
+                                    int64_t footer_size) {
+  ICEBERG_PRECHECK(footer_size >= PuffinFormat::kFooterStartMagicLength +
+                                      PuffinFormat::kFooterStructLength,
+                   "Invalid file: footer size {} is too small", footer_size);
+  ICEBERG_PRECHECK(static_cast<uint64_t>(footer_size) <= footer.size(),
+                   "Invalid file: footer size {} exceeds buffer size {}", footer_size,
+                   footer.size());
+
+  ICEBERG_RETURN_UNEXPECTED(CheckMagic(footer, PuffinFormat::kFooterStartMagicOffset));
+
+  auto footer_struct_offset = footer_size - PuffinFormat::kFooterStructLength;
+  std::span<const std::byte> footer_struct(footer.data() + footer_struct_offset,
+                                           PuffinFormat::kFooterStructLength);
+  ICEBERG_RETURN_UNEXPECTED(
+      CheckMagic(footer_struct, PuffinFormat::kFooterStructMagicOffset));
+
+  ICEBERG_ASSIGN_OR_RAISE(auto payload_size, FooterPayloadSize(footer_struct));
+  ICEBERG_RETURN_UNEXPECTED(CheckFooterSize(footer_size, payload_size));
+
+  ICEBERG_ASSIGN_OR_RAISE(auto flags, DecodeFlags(footer_struct));
+  return FooterInfo{.payload_size = payload_size,
+                    .compression = FooterCompressionCodec(flags)};
+}
+
+Result<FileMetadata> ParseFileMetadata(std::span<const std::byte> payload,
+                                       PuffinCompressionCodec compression) {
+  std::vector<std::byte> decompressed;
+  if (compression != PuffinCompressionCodec::kNone) {
+    ICEBERG_ASSIGN_OR_RAISE(decompressed, Decompress(compression, payload));
+    payload = decompressed;
+  }
+
+  return FileMetadataFromJsonString(
+      std::string_view(reinterpret_cast<const char*>(payload.data()), payload.size()));
+}
+
+}  // namespace
+
+PuffinReader::PuffinReader(std::unique_ptr<SeekableInputStream> stream, int64_t file_size,
+                           std::optional<int64_t> known_footer_size)
+    : stream_(std::move(stream)),
+      file_size_(file_size),
+      known_footer_size_(known_footer_size) {}
+
+PuffinReader::~PuffinReader() = default;
+
+Result<std::unique_ptr<PuffinReader>> PuffinReader::Make(
+    std::unique_ptr<InputFile> input_file, std::optional<int64_t> footer_size,
+    std::optional<int64_t> file_size) {
+  ICEBERG_PRECHECK(input_file, "Input file must not be null");
+  int64_t resolved_file_size = 0;
+  if (file_size.has_value()) {
+    ICEBERG_PRECHECK(*file_size >= 0, "File size must not be negative: {}", *file_size);
+    resolved_file_size = *file_size;
+  } else {
+    ICEBERG_ASSIGN_OR_RAISE(resolved_file_size, input_file->Size());
+  }
+  if (footer_size.has_value()) {
+    ICEBERG_PRECHECK(*footer_size > 0, "Footer size must be positive: {}", *footer_size);
+    ICEBERG_PRECHECK(*footer_size <= resolved_file_size - PuffinFormat::kMagicLength,
+                     "Footer size {} exceeds file size {}", *footer_size,
+                     resolved_file_size);
+    ICEBERG_PRECHECK(*footer_size <= std::numeric_limits<int32_t>::max(),
+                     "Footer size {} is too large", *footer_size);
+  }
+  ICEBERG_ASSIGN_OR_RAISE(auto stream, input_file->Open());
+  return std::unique_ptr<PuffinReader>(
+      new PuffinReader(std::move(stream), resolved_file_size, footer_size));
+}
+
+Result<std::vector<std::byte>> PuffinReader::ReadBytes(int64_t offset, int64_t length) {
+  ICEBERG_PRECHECK(!closed_, "Reader already closed");
+  ICEBERG_PRECHECK(offset >= 0, "Offset must not be negative: {}", offset);
+  ICEBERG_PRECHECK(length >= 0, "Length must not be negative: {}", length);
+  ICEBERG_PRECHECK(offset <= file_size_, "Offset {} exceeds file size {}", offset,
+                   file_size_);
+  ICEBERG_PRECHECK(length <= file_size_ - offset,
+                   "Length {} exceeds file size {} at offset {}", length, file_size_,
+                   offset);
+  std::vector<std::byte> buf(length);
+  ICEBERG_RETURN_UNEXPECTED(stream_->ReadFully(offset, buf));
+  return buf;
+}
+
+Result<int64_t> PuffinReader::FooterSize() {
+  if (known_footer_size_.has_value()) {
+    return *known_footer_size_;
+  }
+
+  ICEBERG_ASSIGN_OR_RAISE(auto footer_struct,
+                          ReadBytes(file_size_ - PuffinFormat::kFooterStructLength,
+                                    PuffinFormat::kFooterStructLength));
+  ICEBERG_RETURN_UNEXPECTED(
+      CheckMagic(footer_struct, PuffinFormat::kFooterStructMagicOffset));
+
+  ICEBERG_ASSIGN_OR_RAISE(auto payload_size, FooterPayloadSize(footer_struct));
+  known_footer_size_ = PuffinFormat::kFooterStartMagicLength +
+                       static_cast<int64_t>(payload_size) +
+                       PuffinFormat::kFooterStructLength;
+  return *known_footer_size_;
+}
+
+Result<std::vector<std::byte>> PuffinReader::ReadFooter(int64_t footer_size) {
+  return ReadBytes(file_size_ - footer_size, footer_size);
+}
+
+Result<FileMetadata> PuffinReader::ReadFileMetadata() {
+  ICEBERG_ASSIGN_OR_RAISE(auto header_bytes, ReadBytes(0, PuffinFormat::kMagicLength));
+  ICEBERG_RETURN_UNEXPECTED(CheckMagic(header_bytes));
+
+  ICEBERG_ASSIGN_OR_RAISE(auto footer_size, FooterSize());
+  ICEBERG_ASSIGN_OR_RAISE(auto footer, ReadFooter(footer_size));
+  ICEBERG_ASSIGN_OR_RAISE(auto footer_info, DecodeFooterInfo(footer, footer_size));
+  std::span<const std::byte> payload_bytes(
+      footer.data() + PuffinFormat::kFooterStartMagicLength, footer_info.payload_size);
+  return ParseFileMetadata(payload_bytes, footer_info.compression);
+}
+
+Result<std::pair<BlobMetadata, std::vector<std::byte>>> PuffinReader::ReadBlob(
+    const BlobMetadata& blob_metadata) {
+  ICEBERG_ASSIGN_OR_RAISE(auto raw_data,
+                          ReadBytes(blob_metadata.offset, blob_metadata.length));
+
+  ICEBERG_ASSIGN_OR_RAISE(
+      auto codec, PuffinCompressionCodecFromName(blob_metadata.compression_codec));
+  if (codec == PuffinCompressionCodec::kNone) {
+    return std::pair{blob_metadata, std::move(raw_data)};
+  }
+
+  ICEBERG_ASSIGN_OR_RAISE(auto decompressed, Decompress(codec, raw_data));
+
+  return std::pair{blob_metadata, std::move(decompressed)};
+}
+
+Result<std::vector<std::pair<BlobMetadata, std::vector<std::byte>>>>
+PuffinReader::ReadAll(const std::vector<BlobMetadata>& blobs) {
+  // Sort by offset for sequential I/O access pattern
+  std::vector<const BlobMetadata*> sorted;
+  sorted.reserve(blobs.size());
+  for (const auto& blob : blobs) {
+    sorted.push_back(&blob);
+  }
+  std::ranges::sort(sorted,
+                    [](const auto* a, const auto* b) { return a->offset < b->offset; });
+
+  std::vector<std::pair<BlobMetadata, std::vector<std::byte>>> results;
+  results.reserve(blobs.size());
+  for (const auto* blob : sorted) {
+    ICEBERG_ASSIGN_OR_RAISE(auto blob_pair, ReadBlob(*blob));
+    results.push_back(std::move(blob_pair));
+  }
+  return results;
+}
+
+Status PuffinReader::Close() {
+  if (closed_) {
+    return {};
+  }
+  ICEBERG_RETURN_UNEXPECTED(stream_->Close());
+  closed_ = true;
+  return {};
+}
+
+}  // namespace iceberg::puffin