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libretroadmin
d56b453891
Deflate, zlib and gzip streams go through rinflate and rdeflate, zstd through rzstd, CHD images through rchd, zip archives through rzip_archive and PNG through rpng. The bundled libraries, their build glue and the system-library options are gone; adler32 and uncompress keep zlib's ABI for the prebuilt FFmpeg archives that still call them. libretro-common is one CMake library that the core, the headless tool and the unit tests all link. The reads take shorter paths on the way. CHD decodes straight from the loader's reads and a range of blocks at a time, and a file read at any alignment decodes into place; CSO keeps one inflate stream instead of one per block; a plain ISO serves a file read with one read of its exact bytes; a stored zip member is read in place and a deflated one through restart points rather than a copy of the whole image in memory; zip members decode into the caller's buffer; sequential reads through the frontend's VFS skip the seek, which also keeps its buffering. libretro/test reads one image as ISO, CSO, CHD and zip through the block devices, boots each, and checks the codecs against Python-made vectors; a CI job runs it.
100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
#include <zip/rzip_archive.h>
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#include "Core/FileLoaders/LocalFileLoader.h"
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#include "Core/FileLoaders/ZipFileLoader.h"
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int64_t ZipFileLoader::BackendRead(void *userdata, uint64_t off, void *dst, size_t len) {
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FileLoader *backend = (FileLoader *)userdata;
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return (int64_t)backend->ReadAt((s64)off, len, dst);
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}
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ZipFileLoader::ZipFileLoader(FileLoader *sourceLoader)
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: ProxiedFileLoader(sourceLoader) {
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if (!backend_ || !backend_->Exists() || backend_->IsDirectory()) {
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return;
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}
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zip_ = ZipContainer(&BackendRead, backend_, (uint64_t)backend_->FileSize());
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if (!zip_) {
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ERROR_LOG(Log::IO, "Failed to open ZIP archive: %s", backend_->GetPath().c_str());
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}
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}
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ZipFileLoader::~ZipFileLoader() {
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if (seek_) {
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rzip_seek_free(seek_);
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}
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}
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bool ZipFileLoader::Initialize(int fileIndex) {
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_dbg_assert_(!initialized_);
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if (!zip_) {
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ERROR_LOG(Log::IO, "Cannot initialize: ZIP archive is null");
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return false;
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}
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const rzip_entry_t *entry = rzip_archive_entry(zip_.Raw(), (uint32_t)fileIndex);
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if (!entry) {
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ERROR_LOG(Log::IO, "Failed to get file index %d", fileIndex);
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return false;
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}
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// Callers (Identify_File and friends) compare against lowercase extensions, like
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// Path::GetFileExtension returns. Not using tolower to avoid the Turkish I problem.
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fileExtension_ = KeepIncludingLast(entry->name, '.');
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for (size_t i = 0; i < fileExtension_.size(); i++) {
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char c = fileExtension_[i];
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if (c >= 'A' && c <= 'Z') {
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fileExtension_[i] = c + ('a' - 'A');
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}
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}
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dataFileSize_ = (s64)entry->size;
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if (entry->method == RZIP_METHOD_STORED) {
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if (entry->csize != entry->size) {
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ERROR_LOG(Log::IO, "Stored ZIP member %d has mismatched sizes", fileIndex);
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return false;
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}
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stored_ = true;
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dataOffset_ = entry->data_off;
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} else {
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seek_ = rzip_seek_new(zip_.Raw(), (uint32_t)fileIndex, 0);
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if (!seek_) {
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ERROR_LOG(Log::IO, "Can't read ZIP member %d (method %u)", fileIndex, entry->method);
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return false;
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}
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}
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initialized_ = true;
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return true;
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}
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size_t ZipFileLoader::ReadAt(s64 absolutePos, size_t bytes, void *data, Flags flags) {
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if (!initialized_ || absolutePos < 0 || absolutePos >= dataFileSize_) {
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return 0;
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}
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if (absolutePos + (s64)bytes > dataFileSize_) {
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bytes = dataFileSize_ - absolutePos;
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}
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if (stored_) {
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return backend_->ReadAt((s64)dataOffset_ + absolutePos, bytes, data, flags);
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}
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// Index on until the range is covered, then decode from the nearest point.
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const uint64_t end = (uint64_t)absolutePos + bytes;
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while (rzip_seek_covered(seek_) < end) {
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const int state = rzip_seek_build(seek_, end);
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if (state < 0) {
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ERROR_LOG(Log::IO, "ZIP member is corrupt (%d)", state);
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return 0;
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}
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if (state == 1)
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break;
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}
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if (rzip_seek_read(seek_, (uint64_t)absolutePos, (uint8_t *)data, bytes) != RZIP_OK) {
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ERROR_LOG(Log::IO, "ZIP read failed at %lld", (long long)absolutePos);
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return 0;
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}
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return bytes;
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}
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