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Support loading Zstandard-compressed ROMs (#1667)

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This is different from the archive support in that the compressed ROMs
are standalone files, rather than archives, making it possible to use
them exactly as if they were regular ROMs, while saving a bunch of space
on disk. This is supported both for DS and GBA ROMs, though given GBA
ROMs' generally small size it's mostly useful for the former.
This commit is contained in:
Nadia Holmquist Pedersen
2023-04-28 19:19:58 +02:00
committed by GitHub
parent 4b170b94d5
commit 38b0d21c22
7 changed files with 121 additions and 24 deletions
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76
src/frontend/qt_sdl/ROMManager.cpp
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@ -22,6 +22,7 @@
#include <string>
#include <utility>
#include <zstd.h>
#ifdef ARCHIVE_SUPPORT_ENABLED
#include "ArchiveUtil.h"
#endif
@ -491,6 +492,27 @@ bool LoadBIOS()
return true;
}
u32 DecompressROM(const u8* inContent, const u32 inSize, u8** outContent)
{
u64 realSize = ZSTD_getFrameContentSize(inContent, inSize);
if (realSize == ZSTD_CONTENTSIZE_UNKNOWN || realSize == ZSTD_CONTENTSIZE_ERROR || realSize > 0x40000000)
{
return 0;
}
u8* realContent = new u8[realSize];
u64 decompressed = ZSTD_decompress(realContent, realSize, inContent, inSize);
if (ZSTD_isError(decompressed))
{
delete[] realContent;
return 0;
}
*outContent = realContent;
return realSize;
}
bool LoadROM(QStringList filepath, bool reset)
{
@ -533,6 +555,25 @@ bool LoadROM(QStringList filepath, bool reset)
fclose(f);
filelen = (u32)len;
if (filename.length() > 4 && filename.substr(filename.length() - 4) == ".zst")
{
u8* outContent = nullptr;
u32 decompressed = DecompressROM(filedata, len, &outContent);
if (decompressed > 0)
{
delete[] filedata;
filedata = outContent;
filelen = decompressed;
filename = filename.substr(0, filename.length() - 4);
}
else
{
delete[] filedata;
return false;
}
}
int pos = LastSep(filename);
if(pos != -1)
basepath = filename.substr(0, pos);
@ -543,14 +584,14 @@ bool LoadROM(QStringList filepath, bool reset)
{
// file inside archive
s32 lenread = Archive::ExtractFileFromArchive(filepath.at(0), filepath.at(1), &filedata, &filelen);
if (lenread < 0) return false;
if (!filedata) return false;
if (lenread != filelen)
{
delete[] filedata;
return false;
}
s32 lenread = Archive::ExtractFileFromArchive(filepath.at(0), filepath.at(1), &filedata, &filelen);
if (lenread < 0) return false;
if (!filedata) return false;
if (lenread != filelen)
{
delete[] filedata;
return false;
}
std::string std_archivepath = filepath.at(0).toStdString();
basepath = std_archivepath.substr(0, LastSep(std_archivepath));
@ -695,6 +736,25 @@ bool LoadGBAROM(QStringList filepath)
fclose(f);
filelen = (u32)len;
if (filename.length() > 4 && filename.substr(filename.length() - 4) == ".zst")
{
u8* outContent = nullptr;
u32 decompressed = DecompressROM(filedata, len, &outContent);
if (decompressed > 0)
{
delete[] filedata;
filedata = outContent;
filelen = decompressed;
filename = filename.substr(0, filename.length() - 4);
}
else
{
delete[] filedata;
return false;
}
}
int pos = LastSep(filename);
basepath = filename.substr(0, pos);
romname = filename.substr(pos+1);