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A fork of https://github.com/crosspoint-reader/crosspoint-reader
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2.7 kB · 72 lines
C
at master
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273#pragma once#include <HalStorage.h>
#include <deque>#include <string>#include <unordered_map>
class ZipFile { public: struct FileStatSlim { uint16_t method; // Compression method uint32_t compressedSize; // Compressed size uint32_t uncompressedSize; // Uncompressed size uint32_t localHeaderOffset; // Offset of local file header };
struct ZipDetails { uint32_t centralDirOffset; uint16_t totalEntries; bool isSet; };
// Target for batch uncompressed size lookup (sorted by hash, then len) struct SizeTarget { uint64_t hash; // FNV-1a 64-bit hash of normalized path uint16_t len; // Length of path for collision reduction uint16_t index; // Caller's index (e.g. spine index) };
// FNV-1a 64-bit hash computed from char buffer (no std::string allocation) static uint64_t fnvHash64(const char* s, size_t len) { uint64_t hash = 14695981039346656037ull; for (size_t i = 0; i < len; i++) { hash ^= static_cast<uint8_t>(s[i]); hash *= 1099511628211ull; } return hash; }
private: const std::string& filePath; FsFile file; ZipDetails zipDetails = {0, 0, false}; std::unordered_map<std::string, FileStatSlim> fileStatSlimCache;
// Cursor for sequential central-dir scanning optimization uint32_t lastCentralDirPos = 0; bool lastCentralDirPosValid = false;
bool loadFileStatSlim(const char* filename, FileStatSlim* fileStat); long getDataOffset(const FileStatSlim& fileStat); bool loadZipDetails();
public: explicit ZipFile(const std::string& filePath) : filePath(filePath) {} ~ZipFile() = default; // Zip file can be opened and closed by hand in order to allow for quick calculation of inflated file size // It is NOT recommended to pre-open it for any kind of inflation due to memory constraints bool isOpen() const { return !!file; } bool open(); bool close(); bool loadAllFileStatSlims(); bool getInflatedFileSize(const char* filename, size_t* size); // Batch lookup: scan ZIP central dir once and fill sizes for matching targets. // targets must be sorted by (hash, len). sizes[target.index] receives uncompressedSize. // Returns number of targets matched. int fillUncompressedSizes(std::deque<SizeTarget>& targets, std::deque<uint32_t>& sizes); // Due to the memory required to run each of these, it is recommended to not preopen the zip file for multiple // These functions will open and close the zip as needed uint8_t* readFileToMemory(const char* filename, size_t* size = nullptr, bool trailingNullByte = false); bool readFileToStream(const char* filename, Print& out, size_t chunkSize);};