422fc4f24e
A few minor improvements to StfsContainerDevice too, and now StfsContainerFile::ReadSync will set out_bytes_read to the actual number of bytes read
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
/**
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******************************************************************************
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* Xenia : Xbox 360 Emulator Research Project *
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******************************************************************************
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* Copyright 2014 Ben Vanik. All rights reserved. *
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* Released under the BSD license - see LICENSE in the root for more details. *
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******************************************************************************
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*/
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#include "xenia/vfs/devices/stfs_container_file.h"
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#include <algorithm>
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#include <cmath>
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#include "xenia/base/math.h"
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#include "xenia/vfs/devices/stfs_container_entry.h"
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namespace xe {
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namespace vfs {
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StfsContainerFile::StfsContainerFile(uint32_t file_access,
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StfsContainerEntry* entry)
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: File(file_access, entry), entry_(entry) {}
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StfsContainerFile::~StfsContainerFile() = default;
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void StfsContainerFile::Destroy() { delete this; }
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X_STATUS StfsContainerFile::ReadSync(void* buffer, size_t buffer_length,
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size_t byte_offset,
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size_t* out_bytes_read) {
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if (byte_offset >= entry_->size()) {
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return X_STATUS_END_OF_FILE;
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}
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size_t src_offset = 0;
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uint8_t* p = reinterpret_cast<uint8_t*>(buffer);
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size_t remaining_length =
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std::min(buffer_length, entry_->size() - byte_offset);
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*out_bytes_read = 0;
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for (size_t i = 0; i < entry_->block_list().size(); i++) {
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auto& record = entry_->block_list()[i];
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if (src_offset + record.length <= byte_offset) {
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// Doesn't begin in this region. Skip it.
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src_offset += record.length;
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continue;
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}
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size_t read_offset =
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(byte_offset > src_offset) ? byte_offset - src_offset : 0;
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size_t read_length =
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std::min(record.length - read_offset, remaining_length);
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auto& file = entry_->files()->at(record.file);
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xe::filesystem::Seek(file, record.offset + read_offset, SEEK_SET);
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auto num_read = fread(p, 1, read_length, file);
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*out_bytes_read += num_read;
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p += num_read;
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src_offset += record.length;
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remaining_length -= read_length;
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if (remaining_length == 0) {
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break;
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}
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}
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return X_STATUS_SUCCESS;
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}
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} // namespace vfs
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} // namespace xe
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