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8d50cb8cef
fceugx/source/ngc/gcunzip.c
dborth 8d50cb8cef bug fixes, finalize 2.0.1
2008-09-06 18:24:52 +00:00

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/****************************************************************************
* FCE Ultra 0.98.12
* Nintendo Wii/Gamecube Port
*
* Tantric September 2008
*
* gcunzip.h
*
* Unzip routines
****************************************************************************/
#include <gccore.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <zlib.h>
#include "dvd.h"
#include "menudraw.h"
#include "gcunzip.h"
/*
* PKWare Zip Header - adopted into zip standard
*/
#define PKZIPID 0x504b0304
#define MAXROM 0x500000
#define ZIPCHUNK 2048
/*
* Zip files are stored little endian
* Support functions for short and int types
*/
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;
}
u16
FLIP16 (u16 b)
{
u16 c;
c = (b & 0xff00) >> 8;
c |= (b & 0xff) << 8;
return c;
}
/****************************************************************************
* IsZipFile
*
* Returns TRUE when PKZIPID is first four characters of buffer
****************************************************************************/
int
IsZipFile (char *buffer)
{
unsigned int *check;
check = (unsigned int *) buffer;
if (check[0] == PKZIPID)
return 1;
return 0;
}
/*****************************************************************************
* unzip
*
* It should be noted that there is a limit of 5MB total size for any ROM
******************************************************************************/
FILE* fatfile; // FAT
u64 discoffset; // DVD
SMBFILE smbfile; // SMB
int
UnZipBuffer (unsigned char *outbuffer, short where)
{
PKZIPHEADER pkzip;
int zipoffset = 0;
int zipchunk = 0;
char out[ZIPCHUNK];
z_stream zs;
int res;
int bufferoffset = 0;
int readoffset = 0;
int have = 0;
char readbuffer[ZIPCHUNK];
char msg[128];
/*** Read Zip Header ***/
switch (where)
{
case 0: // SD Card
fseek(fatfile, 0, SEEK_SET);
fread (readbuffer, 1, ZIPCHUNK, fatfile);
break;
case 1: // DVD
dvd_read (readbuffer, ZIPCHUNK, discoffset);
break;
case 2: // From SMB
SMB_ReadFile(readbuffer, ZIPCHUNK, 0, smbfile);
break;
}
/*** Copy PKZip header to local, used as info ***/
memcpy (&pkzip, readbuffer, sizeof (PKZIPHEADER));
pkzip.uncompressedSize = FLIP32 (pkzip.uncompressedSize);
sprintf (msg, "Unzipping %d bytes ... Wait",
pkzip.uncompressedSize);
ShowAction (msg);
/*** 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)
return 0;
/*** 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)
{
inflateEnd (&zs);
return 0;
}
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;
switch (where)
{
case 0: // SD Card
fread (readbuffer, 1, ZIPCHUNK, fatfile);
break;
case 1: // DVD
readoffset += ZIPCHUNK;
dvd_read (readbuffer, ZIPCHUNK, discoffset+readoffset);
break;
case 2: // From SMB
readoffset += ZIPCHUNK;
SMB_ReadFile(readbuffer, ZIPCHUNK, readoffset, smbfile);
break;
}
}
while (res != Z_STREAM_END);
inflateEnd (&zs);
if (res == Z_STREAM_END)
{
if (pkzip.uncompressedSize == (u32) bufferoffset)
return bufferoffset;
else
return pkzip.uncompressedSize;
}
return 0;
}
// Reading from FAT
int
UnZipFATFile (unsigned char *outbuffer, FILE* infile)
{
fatfile = infile;
return UnZipBuffer(outbuffer, 0);
}
// Reading from DVD
int
UnZipDVDFile (unsigned char *outbuffer, u64 inoffset)
{
discoffset = inoffset;
return UnZipBuffer(outbuffer, 1);
}
// Reading from SMB
int
UnZipSMBFile (unsigned char *outbuffer, SMBFILE infile)
{
smbfile = infile;
return UnZipBuffer(outbuffer, 2);
}
/*
* 7-zip functions are below. Have to be written to work with above.
#include "7zCrc.h"
#include "7zIn.h"
#include "7zExtract.h"
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
char szerrormsg[][30] = {
"7z: Data error",
"7z: Out of memory",
"7z: CRC Error",
"7z: Not implemented",
"7z: Fail",
"7z: Archive error"
};
SZ_RESULT SzRes;
SzFileInStream SzArchiveStream;
CArchiveDatabaseEx SzDb;
ISzAlloc SzAllocImp;
ISzAlloc SzAllocTempImp;
UInt32 SzBlockIndex = 0xFFFFFFFF;
size_t SzBufferSize;
size_t SzOffset;
size_t SzOutSizeProcessed;
CFileItem *SzF;
char sz_buffer[2048];
// needed because there are no header files -.-
//#include <sdcard.h>
#define MAXFILES 1000
#define MAXJOLIET 256
extern FILEENTRIES filelist[MAXFILES];
extern int selection;
extern int maxfiles;
extern int offset;
// the GC's dvd drive only supports offsets and length which are a multiply of 32 bytes
// additionally the max length of a read is 2048 bytes
// this function removes these limitations
// additionally the 7zip SDK does often read data in 1 byte parts from the DVD even when
// it could read 32 bytes. the dvdsf_buffer has been added to avoid having to read the same sector
// over and over again
unsigned char dvdsf_buffer[DVD_SECTOR_SIZE];
u64 dvdsf_last_offset = 0;
u64 dvdsf_last_length = 0;
int dvd_buffered_read(void *dst, u32 len, u64 offset) {
int ret = 0;
// only read data if the data inside dvdsf_buffer cannot be used
if(offset != dvdsf_last_offset || len > dvdsf_last_length) {
char msg[1024];
sprintf(msg, "buff_read: len=%d, offset=%llX, UseSD=%d", len, offset, UseSDCARD);
//WaitPrompt(msg);
memset(&dvdsf_buffer, '\0', DVD_SECTOR_SIZE);
if (UseSDCARD) {
if (filehandle == NULL)
GetSDInfo();
fseek(filehandle, offset, SEEK_SET);
fread(&dvdsf_buffer, len, 1, filehandle);
} else if (!UseWiiSDCARD)
ret = dvd_read(&dvdsf_buffer, len, offset);
dvdsf_last_offset = offset;
dvdsf_last_length = len;
}
memcpy(dst, &dvdsf_buffer, len);
return ret;
}
int dvd_safe_read(void *dst_v, u32 len, u64 offset) {
unsigned char buffer[DVD_SECTOR_SIZE]; // buffer for one dvd sector
// if read size and length are a multiply of DVD_(OFFSET,LENGTH)_MULTIPLY and length < DVD_MAX_READ_LENGTH
// we don't need to fix anything
if(len % DVD_LENGTH_MULTIPLY == 0 && offset % DVD_OFFSET_MULTIPLY == 0 && len <= DVD_MAX_READ_LENGTH) {
char msg[1024];
sprintf(msg, "simple_safe_read: len=%d, offset=%llX, UseSD=%d", len, offset, UseSDCARD);
//WaitPrompt(msg);
int ret = dvd_buffered_read(buffer, len, offset);
memcpy(dst_v, &buffer, len);
return ret;
} else {
char msg[1024];
sprintf(msg, "complex_safe_read: len=%d, offset=%llX, UseSD=%d", len, offset, UseSDCARD);
//WaitPrompt(msg);
// no errors yet -> ret = 0
// the return value of dvd_read will be OR'd with ret
// because dvd_read does return 1 on error and 0 on success and
// because 0 | 1 = 1 ret will also contain 1 if at least one error
// occured and 0 otherwise ;)
int ret = 0; // return value of dvd_read
// we might need to fix all 3 issues
unsigned char *dst = (unsigned char *)dst_v; // gcc will not allow to use var[num] on void* types
u64 bytesToRead; // the number of bytes we still need to read & copy to the output buffer
u64 currentOffset; // the current dvd offset
u64 bufferOffset; // the current buffer offset
u64 i, j, k; // temporary variables which might be used for different stuff
// unsigned char buffer[DVD_SECTOR_SIZE]; // buffer for one dvd sector
currentOffset = offset;
bytesToRead = len;
bufferOffset = 0;
// fix first issue (offset is not a multiply of 32)
if(offset % DVD_OFFSET_MULTIPLY) {
// calcualte offset of the prior 32 byte position
i = currentOffset - (currentOffset % DVD_OFFSET_MULTIPLY);
// calculate the offset from which the data of the dvd buffer will be copied
j = currentOffset % DVD_OFFSET_MULTIPLY;
// calculate the number of bytes needed to reach the next DVD_OFFSET_MULTIPLY byte mark
k = DVD_OFFSET_MULTIPLY - j;
// maybe we'll only need to copy a few bytes and we therefore don't even reach the next sector
if(k > len) {
k = len;
}
// read 32 bytes from the last 32 byte position
ret |= dvd_buffered_read(buffer, DVD_OFFSET_MULTIPLY, i);
// copy the bytes to the output buffer and update currentOffset, bufferOffset and bytesToRead
memcpy(&dst[bufferOffset], &buffer[j], k);
currentOffset += k;
bufferOffset += k;
bytesToRead -= k;
}
// fix second issue (more than 2048 bytes are needed)
if(bytesToRead > DVD_MAX_READ_LENGTH) {
// calculate the number of 2048 bytes sector needed to get all data
i = (bytesToRead - (bytesToRead % DVD_MAX_READ_LENGTH)) / DVD_MAX_READ_LENGTH;
// read data in 2048 byte sector
for(j = 0; j < i; j++) {
ret |= dvd_buffered_read(buffer, DVD_MAX_READ_LENGTH, currentOffset); // read sector
memcpy(&dst[bufferOffset], buffer, DVD_MAX_READ_LENGTH); // copy to output buffer
// update currentOffset, bufferOffset and bytesToRead
currentOffset += DVD_MAX_READ_LENGTH;
bufferOffset += DVD_MAX_READ_LENGTH;
bytesToRead -= DVD_MAX_READ_LENGTH;
}
}
// fix third issue (length is not a multiply of 32)
if(bytesToRead) {
ret |= dvd_buffered_read(buffer, DVD_MAX_READ_LENGTH, currentOffset); // read 32 byte from the dvd
memcpy(&dst[bufferOffset], buffer, bytesToRead); // copy bytes to output buffer
}
//free(tmp);
return ret;
}
}
// function used by the 7zip SDK to read data from the DVD (fread)
SZ_RESULT SzDvdFileReadImp(void *object, void **buffer, size_t maxRequiredSize, size_t *processedSize)
{
// the void* object is a SzFileInStream
SzFileInStream *s = (SzFileInStream *)object;
// calculate dvd sector offset
u64 offset = (u64)(s->offset + s->pos);
if(maxRequiredSize > 2048)
{
maxRequiredSize = 2048;
}
// read data
dvd_safe_read(sz_buffer, maxRequiredSize, offset);
*buffer = sz_buffer;
*processedSize = maxRequiredSize;
s->pos += *processedSize;
return SZ_OK;
}
// function used by the 7zip SDK to change the filepointer (fseek(object, pos, SEEK_SET))
SZ_RESULT SzDvdFileSeekImp(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)
{
WaitPrompt("7z Error: The 7z SDK wants to start reading somewhere behind the EOF...");
return SZE_FAIL;
}
// save new position and return
s->pos = pos;
return SZ_OK;
}
SZ_RESULT SzDvdIsArchive(u64 dvd_offset) {
// 7z signautre
static Byte Signature[6] = {'7', 'z', 0xBC, 0xAF, 0x27, 0x1C};
Byte Candidate[6];
// read the data from the DVD
int res = dvd_safe_read (&Candidate, 6, dvd_offset);
char msg[1024];
size_t i;
for(i = 0; i < 6; i++) {
if(Candidate[i] != Signature[i]) {
return SZE_FAIL;
}
}
return SZ_OK;
}
// display an error message
void SzDisplayError(SZ_RESULT res)
{
WaitPrompt(szerrormsg[(res - 1)]);
}
static u64 rootdir;
static int rootdirlength;
void SzParse(void) {
// save the offset and the length of this file inside the archive stream structure
SzArchiveStream.offset = filelist[selection].offset;
SzArchiveStream.len = filelist[selection].length;
SzArchiveStream.pos = 0;
// set handler functions for reading data from DVD and setting the position
SzArchiveStream.InStream.Read = SzDvdFileReadImp;
SzArchiveStream.InStream.Seek = SzDvdFileSeekImp;
// 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)
{
// free memory used by the 7z SDK
SzArDbExFree(&SzDb, SzAllocImp.Free);
return;
}
else
{
// archive opened successfully
// erase all previous entries
memset(&filelist, 0, sizeof(FILEENTRIES) * MAXFILES);
// add '../' folder
strncpy(filelist[0].filename, "../", 3);
filelist[0].length = rootdirlength; // store rootdir in case the user wants to go one folder up
filelist[0].offset = rootdir; // -''- rootdir length -''-
filelist[0].flags = 0;
// get contents and parse them into the dvd 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;
}
// do not exceed MAXFILES to avoid possible buffer overflows
if(SzJ == (MAXFILES - 1))
{
break;
}
// parse information about this file to the dvd file list structure
strncpy(filelist[SzJ].filename, SzF->Name, MAXJOLIET); // copy joliet name (useless...)
filelist[SzJ].filename[MAXJOLIET] = 0; // terminate string
filelist[SzJ].length = SzF->Size; // filesize
filelist[SzJ].offset = SzI; // the extraction function identifies the file with this number
filelist[SzJ].flags = 0; // only files will be displayed (-> no flags)
SzJ++;
}
// update maxfiles and select the first entry
maxfiles = SzJ;
offset = selection = 0;
return;
}
}
void SzClose(void)
{
SzArDbExFree(&SzDb, SzAllocImp.Free);
}
bool SzExtractROM(int i, unsigned char *buffer)
{
// prepare some variables
SzBlockIndex = 0xFFFFFFFF;
SzOffset = 0;
// Unzip the file
//ShowAction("Un7zipping file. Please wait...");
WaitPrompt("Un7zipping file. Please wait...");
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);
// check for errors
if(SzRes != SZ_OK)
{
// display error message
WaitPrompt(szerrormsg[(SzRes - 1)]);
return false;
}
else
{
// close 7Zip archive and free memory
SzArDbExFree(&SzDb, SzAllocImp.Free);
return true;
}
}
*/
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