/**************************************************************************** * Snes9x Nintendo Wii/Gamecube Port * * softdev July 2006 * Michniewski 2008 * Tantric 2008-2010 * * gcunzip.cpp * * File unzip routines ***************************************************************************/ #include #include #include #include #include #include "snes9xgx.h" #include "fileop.h" #include "filebrowser.h" #include "menu.h" #include "gcunzip.h" extern "C" { #include "utils/sz/7zCrc.h" #include "utils/sz/7zIn.h" #include "utils/sz/7zExtract.h" } #define ZIPCHUNK 2048 /* * Zip file header definition */ typedef struct { unsigned int zipid __attribute__ ((__packed__)); // 0x04034b50 unsigned short zipversion __attribute__ ((__packed__)); unsigned short zipflags __attribute__ ((__packed__)); unsigned short compressionMethod __attribute__ ((__packed__)); unsigned short lastmodtime __attribute__ ((__packed__)); unsigned short lastmoddate __attribute__ ((__packed__)); unsigned int crc32 __attribute__ ((__packed__)); unsigned int compressedSize __attribute__ ((__packed__)); unsigned int uncompressedSize __attribute__ ((__packed__)); unsigned short filenameLength __attribute__ ((__packed__)); unsigned short extraDataLength __attribute__ ((__packed__)); } PKZIPHEADER; /* * Zip files are stored little endian * Support functions for short and int types */ static u32 FLIP32 (u32 b) { unsigned int c; c = (b & 0xff000000) >> 24; c |= (b & 0xff0000) >> 8; c |= (b & 0xff00) << 8; c |= (b & 0xff) << 24; return c; } static u16 FLIP16 (u16 b) { u16 c; c = (b & 0xff00) >> 8; c |= (b & 0xff) << 8; return c; } /**************************************************************************** * IsZipFile * * Returns TRUE when 0x504b0304 is first four characters of buffer ***************************************************************************/ int IsZipFile (char *buffer) { unsigned int *check = (unsigned int *) buffer; if (check[0] == 0x504b0304) return 1; return 0; } /***************************************************************************** * UnZipBuffer ******************************************************************************/ size_t UnZipBuffer (unsigned char *outbuffer) { PKZIPHEADER pkzip; size_t zipoffset = 0; size_t zipchunk = 0; char out[ZIPCHUNK]; z_stream zs; int res; size_t bufferoffset = 0; size_t have = 0; char readbuffer[ZIPCHUNK]; size_t sizeread = 0; // Read Zip Header fseek(file, 0, SEEK_SET); sizeread = fread (readbuffer, 1, ZIPCHUNK, file); if(sizeread <= 0) return 0; /*** Copy PKZip header to local, used as info ***/ memcpy (&pkzip, readbuffer, sizeof (PKZIPHEADER)); pkzip.uncompressedSize = FLIP32 (pkzip.uncompressedSize); ShowProgress ("Loading...", 0, pkzip.uncompressedSize); /*** Prepare the zip stream ***/ memset (&zs, 0, sizeof (z_stream)); zs.zalloc = Z_NULL; zs.zfree = Z_NULL; zs.opaque = Z_NULL; zs.avail_in = 0; zs.next_in = Z_NULL; res = inflateInit2 (&zs, -MAX_WBITS); if (res != Z_OK) goto done; /*** Set ZipChunk for first pass ***/ zipoffset = (sizeof (PKZIPHEADER) + FLIP16 (pkzip.filenameLength) + FLIP16 (pkzip.extraDataLength)); zipchunk = ZIPCHUNK - zipoffset; /*** Now do it! ***/ do { zs.avail_in = zipchunk; zs.next_in = (Bytef *) & readbuffer[zipoffset]; /*** Now inflate until input buffer is exhausted ***/ do { zs.avail_out = ZIPCHUNK; zs.next_out = (Bytef *) & out; res = inflate (&zs, Z_NO_FLUSH); if (res == Z_MEM_ERROR) { goto done; } have = ZIPCHUNK - zs.avail_out; if (have) { /*** Copy to normal block buffer ***/ memcpy (&outbuffer[bufferoffset], &out, have); bufferoffset += have; } } while (zs.avail_out == 0); // Readup the next 2k block zipoffset = 0; zipchunk = ZIPCHUNK; sizeread = fread (readbuffer, 1, ZIPCHUNK, file); if(sizeread <= 0) goto done; // read failure ShowProgress ("Loading...", bufferoffset, pkzip.uncompressedSize); } while (res != Z_STREAM_END); done: inflateEnd (&zs); CancelAction(); if (res == Z_STREAM_END) return pkzip.uncompressedSize; else return 0; } /**************************************************************************** * GetFirstZipFilename * * Returns the filename of the first file in the zipped archive * The idea here is to do the least amount of work required ***************************************************************************/ char * GetFirstZipFilename () { char * firstFilename = NULL; char tempbuffer[ZIPCHUNK]; char filepath[1024]; if(!MakeFilePath(filepath, FILE_ROM)) return NULL; // read start of ZIP if(LoadFile (tempbuffer, filepath, ZIPCHUNK, NOTSILENT) < 35) return NULL; tempbuffer[28] = 0; // truncate - filename length is 2 bytes long (bytes 26-27) int namelength = tempbuffer[26]; // filename length starts 26 bytes in if(namelength < 0 || namelength > 200) // filename is not a reasonable length { ErrorPrompt("Error - Invalid ZIP file!"); return NULL; } firstFilename = &tempbuffer[30]; // first filename of a ZIP starts 31 bytes in firstFilename[namelength] = 0; // truncate at filename length return strdup(firstFilename); } /**************************************************************************** * 7z functions ***************************************************************************/ typedef struct _SzFileInStream { ISzInStream InStream; u64 offset; // offset of the file unsigned int len; // length of the file u64 pos; // current position of the file pointer } SzFileInStream; // 7zip error list static char szerrormsg[][100] = { "File is corrupt.", // 7z: Data error "Archive contains too many files.", // 7z: Out of memory "File is corrupt (CRC mismatch).", // 7z: CRC Error "File uses unsupported compression settings.", // 7z: Not implemented "File is corrupt.", // 7z: Fail "Failed to read file data.", // 7z: Data read failure "File is corrupt.", // 7z: Archive error "File uses too high of compression settings (dictionary size is too large).", // 7z: Dictionary too large }; static SZ_RESULT SzRes; static SzFileInStream SzArchiveStream; static CArchiveDatabaseEx SzDb; static ISzAlloc SzAllocImp; static ISzAlloc SzAllocTempImp; static UInt32 SzBlockIndex = 0xFFFFFFFF; static size_t SzBufferSize; static size_t SzOffset; static size_t SzOutSizeProcessed; static CFileItem *SzF; static char sz_buffer[2048]; static int szMethod = 0; /**************************************************************************** * Is7ZipFile * * Returns 1 when 7z signature is found ****************************************************************************/ int Is7ZipFile (char *buffer) { // 7z signature static Byte Signature[6] = {'7', 'z', 0xBC, 0xAF, 0x27, 0x1C}; int i; for(i = 0; i < 6; i++) if(buffer[i] != Signature[i]) return 0; return 1; // 7z archive found } // display an error message static void SzDisplayError(SZ_RESULT res) { char msg[1024]; sprintf(msg, "7z decompression failed: %s", szerrormsg[(res - 1)]); ErrorPrompt(msg); } // function used by the 7zip SDK to read data from SD/USB/DVD/SMB static SZ_RESULT SzFileReadImp(void *object, void **buffer, size_t maxRequiredSize, size_t *processedSize) { size_t sizeread = 0; if(maxRequiredSize == 0) return SZ_OK; // the void* object is a SzFileInStream SzFileInStream *s = (SzFileInStream *) object; if (maxRequiredSize > 2048) maxRequiredSize = 2048; // read data sizeread = fread(sz_buffer, 1, maxRequiredSize, file); if(sizeread <= 0) return SZE_FAILREAD; *buffer = sz_buffer; *processedSize = sizeread; s->pos += sizeread; if(sizeread > 1024) // only show progress for large reads // this isn't quite right, but oh well ShowProgress ("Loading...", s->pos, browserList[browser.selIndex].length); return SZ_OK; } // function used by the 7zip SDK to change the filepointer static SZ_RESULT SzFileSeekImp(void *object, CFileSize pos) { // the void* object is a SzFileInStream SzFileInStream *s = (SzFileInStream *) object; // check if the 7z SDK wants to move the pointer to somewhere after the EOF if (pos >= s->len) return SZE_FAIL; // save new position and return if(fseek(file, (long)pos, SEEK_SET) != 0) return SZE_FAIL; s->pos = pos; return SZ_OK; } /**************************************************************************** * SzClose * * Closes a 7z file ***************************************************************************/ void SzClose() { if(SzDb.Database.NumFiles > 0) SzArDbExFree(&SzDb, SzAllocImp.Free); } /**************************************************************************** * SzParse * * Opens a 7z file, and parses it * It parses the entire 7z for full browsing capability ***************************************************************************/ int SzParse(char * filepath) { if(!filepath) return 0; int device; if(!FindDevice(browser.dir, &device) || !GetFileSize(browser.selIndex)) return 0; int nbfiles = 0; // save the length/offset of this file unsigned int filelen = browserList[browser.selIndex].length; // setup archive stream SzArchiveStream.offset = 0; SzArchiveStream.len = filelen; SzArchiveStream.pos = 0; // open file file = fopen (filepath, "rb"); if(!file) return 0; // set szMethod to current chosen load device szMethod = device; // set handler functions for reading data from SD/USB/SMB/DVD SzArchiveStream.InStream.Read = SzFileReadImp; SzArchiveStream.InStream.Seek = SzFileSeekImp; // set default 7Zip SDK handlers for allocation and freeing memory SzAllocImp.Alloc = SzAlloc; SzAllocImp.Free = SzFree; SzAllocTempImp.Alloc = SzAllocTemp; SzAllocTempImp.Free = SzFreeTemp; // prepare CRC and 7Zip database structures InitCrcTable(); SzArDbExInit(&SzDb); // open the archive SzRes = SzArchiveOpen(&SzArchiveStream.InStream, &SzDb, &SzAllocImp, &SzAllocTempImp); if (SzRes != SZ_OK) { SzDisplayError(SzRes); // free memory used by the 7z SDK SzClose(); } else // archive opened successfully { if(SzDb.Database.NumFiles > 0) { // Parses the 7z into a full file listing HaltParseThread(); // halt parsing ResetBrowser(); // reset browser // add '..' folder in case the user wants exit the 7z AddBrowserEntry(); sprintf(browserList[0].displayname, "Up One Level"); browserList[0].isdir = 1; browserList[0].length = filelen; browserList[0].icon = ICON_FOLDER; // get contents and parse them into file list structure unsigned int SzI, SzJ; SzJ = 1; for (SzI = 0; SzI < SzDb.Database.NumFiles; SzI++) { SzF = SzDb.Database.Files + SzI; // skip directories if (SzF->IsDirectory) continue; if(!AddBrowserEntry()) { ResetBrowser(); ErrorPrompt("Out of memory: too many files!"); SzClose(); SzJ = 0; break; } // parse information about this file to the file list structure snprintf(browserList[SzJ].filename, MAXJOLIET, "%s", SzF->Name); StripExt(browserList[SzJ].displayname, browserList[SzJ].filename); browserList[SzJ].length = SzF->Size; // filesize browserList[SzJ].isdir = 0; // only files will be displayed (-> no flags) browserList[SzJ].filenum = SzI; // the extraction function identifies the file with this number SzJ++; } nbfiles = SzJ; } else { SzClose(); } } CancelAction(); // close file fclose(file); return nbfiles; } /**************************************************************************** * SzExtractFile * * Extracts the given file # into the buffer specified * Must parse the 7z BEFORE running this function ***************************************************************************/ size_t SzExtractFile(int i, unsigned char *buffer) { // prepare some variables SzBlockIndex = 0xFFFFFFFF; SzOffset = 0; // Unzip the file SzRes = SzExtract2( &SzArchiveStream.InStream, &SzDb, i, // index of file &SzBlockIndex, // index of solid block &buffer, &SzBufferSize, &SzOffset, // offset of stream for required file in *outBuffer &SzOutSizeProcessed, // size of file in *outBuffer &SzAllocImp, &SzAllocTempImp); // close 7Zip archive and free memory SzClose(); CancelAction(); // check for errors if(SzRes != SZ_OK) { // display error message SzDisplayError(SzRes); return 0; } else { return SzOutSizeProcessed; } }