Move Media Galleries FileAPI code out of webkit.

webkit/fileapi/media/picasa/pmp_column_reader.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "webkit/fileapi/media/picasa/pmp_column_reader.h"
-
-#include <cstring>
-
-#include "base/file_util.h"
-#include "base/files/file_path.h"
-#include "base/logging.h"
-#include "base/threading/thread_restrictions.h"
-
-namespace picasaimport {
-
-namespace {
-
-const size_t kPmpMaxFilesize = 50*1024*1024; // Maximum of 50 MB.
-
-}  // namespace
-
-PmpColumnReader::PmpColumnReader()
-    : length_(0),
-      field_type_(PMP_TYPE_INVALID),
-      rows_(0) { }
-
-PmpColumnReader::~PmpColumnReader() { }
-
-bool PmpColumnReader::Init(const base::FilePath& filepath, uint32* rows_read) {
-  DCHECK(!data_.get());
-  base::ThreadRestrictions::AssertIOAllowed();
-
-  int64 length = 0; // Signed temporary.
-  if (!file_util::GetFileSize(filepath, &length))
-    return false;
-
-  length_ = length;
-
-  if (length_ < kPmpHeaderSize || length_ > kPmpMaxFilesize)
-    return false;
-
-  data_.reset(new uint8[length_]);
-
-  char* data_begin = reinterpret_cast<char*>(data_.get());
-
-  return file_util::ReadFile(filepath, data_begin, length_) &&
-         ParseData(rows_read);
-}
-
-bool PmpColumnReader::ReadString(const uint32 row, std::string* result) const {
-  DCHECK(data_.get() != NULL);
-  DCHECK_GT(length_, kPmpHeaderSize + row);
-
-  if (field_type_ != PMP_TYPE_STRING || row >= rows_)
-    return false;
-
-  *result = strings_[row];
-  return true;
-}
-
-bool PmpColumnReader::ReadUInt32(const uint32 row, uint32* result) const {
-  DCHECK(data_.get() != NULL);
-  DCHECK_GT(length_, kPmpHeaderSize + row * sizeof(uint32));
-
-  if (field_type_ != PMP_TYPE_UINT32 || row >= rows_)
-    return false;
-
-  *result = reinterpret_cast<uint32*>(data_.get() + kPmpHeaderSize)[row];
-  return true;
-}
-
-bool PmpColumnReader::ReadDouble64(const uint32 row, double* result) const {
-  DCHECK(data_.get() != NULL);
-  DCHECK_GT(length_, kPmpHeaderSize + row * sizeof(double));
-
-  if (field_type_ != PMP_TYPE_DOUBLE64 || row >= rows_)
-    return false;
-
-  *result = reinterpret_cast<double*>(data_.get() + kPmpHeaderSize)[row];
-  return true;
-}
-
-bool PmpColumnReader::ReadUInt8(const uint32 row, uint8* result) const {
-  DCHECK(data_.get() != NULL);
-  DCHECK_GT(length_, kPmpHeaderSize + row * sizeof(uint8));
-
-  if (field_type_ != PMP_TYPE_UINT8 || row >= rows_)
-    return false;
-
-  *result = reinterpret_cast<uint8*>(data_.get() + kPmpHeaderSize)[row];
-  return true;
-}
-
-bool PmpColumnReader::ReadUInt64(const uint32 row, uint64* result) const {
-  DCHECK(data_.get() != NULL);
-  DCHECK_GT(length_, kPmpHeaderSize + row * sizeof(uint64));
-
-  if (field_type_ != PMP_TYPE_UINT64 || row >= rows_)
-    return false;
-
-  *result = reinterpret_cast<uint64*>(data_.get() + kPmpHeaderSize)[row];
-  return true;
-}
-
-bool PmpColumnReader::ParseData(uint32* rows_read) {
-  DCHECK(data_.get() != NULL);
-  DCHECK_GE(length_, kPmpHeaderSize);
-
-  // Check all magic bytes.
-  if (memcmp(&kPmpMagic1, &data_[kPmpMagic1Offset], sizeof(kPmpMagic1)) != 0 ||
-      memcmp(&kPmpMagic2, &data_[kPmpMagic2Offset], sizeof(kPmpMagic2)) != 0 ||
-      memcmp(&kPmpMagic3, &data_[kPmpMagic3Offset], sizeof(kPmpMagic3)) != 0 ||
-      memcmp(&kPmpMagic4, &data_[kPmpMagic4Offset], sizeof(kPmpMagic4)) != 0) {
-    return false;
-  }
-
-  uint16 field_type_data =
-      *(reinterpret_cast<uint16*>(&data_[kPmpFieldType1Offset]));
-
-  // Verify if field type matches second declaration
-  if (field_type_data !=
-      *(reinterpret_cast<uint16*>(&data_[kPmpFieldType2Offset]))) {
-    return false;
-  }
-
-  field_type_ = static_cast<PmpFieldType>(field_type_data);
-
-  rows_ = *(reinterpret_cast<uint32*>(&data_[kPmpRowCountOffset]));
-
-  size_t body_length = length_ - kPmpHeaderSize;
-  size_t expected_body_length = 0;
-  switch (field_type_) {
-    case PMP_TYPE_STRING:
-      expected_body_length = IndexStrings();
-      break;
-    case PMP_TYPE_UINT32:
-      expected_body_length = rows_ * sizeof(uint32);
-      break;
-    case PMP_TYPE_DOUBLE64:
-      expected_body_length = rows_ * sizeof(double);
-      break;
-    case PMP_TYPE_UINT8:
-      expected_body_length = rows_ * sizeof(uint8);
-      break;
-    case PMP_TYPE_UINT64:
-      expected_body_length = rows_ * sizeof(uint64);
-      break;
-    default:
-      return false;
-      break;
-  }
-
-  if (body_length == expected_body_length && rows_read)
-    *rows_read = rows_;
-  return body_length == expected_body_length;
-}
-
-long PmpColumnReader::IndexStrings() {
-  DCHECK(data_.get() != NULL);
-  DCHECK_GE(length_, kPmpHeaderSize);
-
-  strings_.reserve(rows_);
-
-  size_t bytes_parsed = kPmpHeaderSize;
-  const uint8* data_cursor = data_.get() + kPmpHeaderSize;
-
-  while (strings_.size() < rows_) {
-    const uint8* string_end = static_cast<const uint8*>(
-        memchr(data_cursor, '\0', length_ - bytes_parsed));
-
-    // Fail if cannot find null termination. String runs on past file end.
-    if (string_end == NULL)
-      return -1;
-
-    // Length of string. (+1 to include the termination character).
-    ptrdiff_t length_in_bytes = string_end - data_cursor + 1;
-
-    strings_.push_back(reinterpret_cast<const char*>(data_cursor));
-    data_cursor += length_in_bytes;
-    bytes_parsed += length_in_bytes;
-  }
-
-  return bytes_parsed - kPmpHeaderSize;
-}
-
-}  // namespace picasaimport