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9bb8315441
walking the zip prevents minizip from re-reading the same data repeatedly from the actual backing filesystem. also improves most usages of minizip to allow for >4GB, files altho we probably don't need it
49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
// Copyright 2019 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <algorithm>
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#include <mz_compat.h>
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#include "Common/CommonTypes.h"
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#include "Common/ScopeGuard.h"
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namespace Common
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{
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// Reads all of the current file. destination must be big enough to fit the whole file.
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inline bool ReadFileFromZip(unzFile file, u8* destination, u64 len)
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{
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const u64 MAX_BUFFER_SIZE = 65535;
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if (unzOpenCurrentFile(file) != UNZ_OK)
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return false;
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Common::ScopeGuard guard{[&] { unzCloseCurrentFile(file); }};
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u64 bytes_to_go = len;
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while (bytes_to_go > 0)
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{
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// NOTE: multiples of 4G can't cause read_len == 0 && bytes_to_go > 0, as MAX_BUFFER_SIZE is
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// small.
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const u32 read_len = static_cast<u32>(std::min(bytes_to_go, MAX_BUFFER_SIZE));
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const int rv = unzReadCurrentFile(file, destination, read_len);
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if (rv < 0)
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return false;
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const u32 bytes_read = static_cast<u32>(rv);
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bytes_to_go -= bytes_read;
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destination += bytes_read;
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}
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return unzEndOfFile(file) == 1;
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}
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template <typename ContiguousContainer>
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bool ReadFileFromZip(unzFile file, ContiguousContainer* destination)
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{
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return ReadFileFromZip(file, reinterpret_cast<u8*>(destination->data()), destination->size());
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}
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} // namespace Common
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