61 lines
2.2 KiB
C++
61 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 "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(kernel::KernelState* kernel_state,
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uint32_t file_access,
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StfsContainerEntry* entry)
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: XFile(kernel_state, file_access, entry), entry_(entry) {}
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StfsContainerFile::~StfsContainerFile() = default;
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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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// Each block is 4096.
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// Blocks may not be sequential, so we need to read by blocks and handle the
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// offsets.
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size_t real_length = std::min(buffer_length, entry_->size() - byte_offset);
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size_t start_block = byte_offset / 4096;
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size_t end_block =
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std::min(entry_->block_list().size(),
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(size_t)ceil((byte_offset + real_length) / 4096.0));
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uint8_t* dest_ptr = reinterpret_cast<uint8_t*>(buffer);
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size_t remaining_length = real_length;
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for (size_t n = start_block; n < end_block; n++) {
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auto& record = entry_->block_list()[n];
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size_t offset = record.offset;
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size_t read_length = std::min(remaining_length, record.length);
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if (n == start_block) {
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offset += byte_offset % 4096;
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read_length = std::min(read_length, record.length - (byte_offset % 4096));
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}
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memcpy(dest_ptr, entry_->mmap()->data() + offset, read_length);
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dest_ptr += read_length;
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remaining_length -= read_length;
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}
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*out_bytes_read = real_length;
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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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