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pak.c
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pak.c
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/***************************************************************************
pak.c - description
-------------------
begin : Fre Feb 21 17:42:09 CET 2003
copyright : (C) 2003-2016 by Dominik Jall
email : dominik.jall@gmail.com
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "pak.h"
#define VERSION 0.3
#ifndef USE_SDL //if you want to use SDL, you wouldn't want a main() here, since you have your own
int main(int argc, char* argv[])
{
if(argc == 1)
{
printHelp();
return 0;
}
if(argc == 2)
{
printf("pak: missing argument\n");
return 1;
}
if(checkCmd(argv) == 0)
{
printf("pak: invalid command\n");
return 1;
}
if(strncmp(argv[1], "c", 1) == 0 && argc == 3) //create a new PAK
{
createPak(argv[2]);
//printf("Successfully created ");
//printf(argv[2]);
//printf("\n");
return 0;
}
if(strncmp(argv[1], "p", 1) == 0 && argc == 3) //print contents of a pak
{
printDirTree(openPak(argv[2]));
return 0;
}
if(strncmp(argv[1], "i", 1) == 0 && argc == 5) //insert file into pak
{
if(insertPak(argv[3], argv[4], openPak(argv[2])) != 0)
{
printf("pak: Couldn't insert given file.\n");
return -1;
}
} else if(strncmp(argv[1], "i", 1) == 0 && argc < 5)
{
printf("pak: missing argument\n");
return 1;
}
if(strncmp(argv[1], "v", 1) == 0 && argc == 3) //verify PAK
{
switch(checkPak(openPak(argv[2])))
{
case -1:
printf("pak: %s --> Magic corrupt / Not a PAK file\n", argv[2]);
return -1;
case -2:
printf("pak: %s --> Header corrupt / PAK file broken\n", argv[2]);
return -1;
case 0:
printf("pak: %s --> OK\n", argv[2]);
}
return 0;
}
if(strncmp(argv[1], "e", 1) == 0 && argc == 5) //extract file from pak
{
if(extractPak(argv[3], argv[4], openPak(argv[2])) != 0)
{
printf("pak: Couldn't extract given file.\n");
return -1;
}
} else if(strncmp(argv[1], "e", 1) == 0 && argc < 5)
{
printf("pak: missing argument\n");
return 1;
}
return 0;
}
#endif
void createPak(char* filename)
{
pakfile mypak;
mypak.header.head[0] = 'P';
mypak.header.head[1] = 'A';
mypak.header.head[2] = 'C';
mypak.header.head[3] = 'K';
mypak.header.dir_offset = sizeof(mypak.header.head) + 1;
mypak.header.dir_length = 1;
mypak.handle = fopen(filename, "wb");
fwrite(&mypak.header,sizeof(mypak.header),1,mypak.handle);
fclose(mypak.handle);
}
int checkPak(pakfile *fp)
{
if( fp->header.head[0] != 'P' || fp->header.head[1] != 'A' || fp->header.head[2] != 'C' || fp->header.head[3] != 'K')
return -1; //ident corrupt
if( fp->header.dir_offset < (sizeof(fp->header.head) + 1) || fp->header.dir_length < 1)
return -2; //header corrupt
return 0;
}
pakfile *openPak(char* filename)
{
pakfile *mypak;
FILE *fp;
fp = fopen(filename, "r+");
mypak = malloc(sizeof(pakfile));
mypak->handle = fp;
if(mypak->handle == NULL)
return NULL;
fread(&mypak->header, sizeof(pakheader), 1, mypak->handle);
return mypak;
}
int insertPak(char* file, char* inpak, pakfile *fp)
{
unsigned int count;
dirsection sect;
dirsection *files;
int x =0;
if(sizeof(inpak) > 56) //to stay compatible to Quake 2 format, this may not be longer than 56 char
return -1;
byte* buffer = readFile(file, &count);
if(fp->header.dir_length == 1)
{
fseek(fp->handle, 4, SEEK_SET); //go to directory offset-record
fp->header.dir_offset = sizeof(fp->header) + sizeof(byte)*count;
fp->header.dir_length = sizeof(dirsection);
//write new offset and length
fwrite(&fp->header.dir_offset, sizeof(fp->header.dir_offset), 1, fp->handle);
fwrite(&fp->header.dir_length, sizeof(fp->header.dir_length), 1, fp->handle);
//now write the raw binary data
fwrite(buffer, sizeof(byte), count, fp->handle);
strcpy(sect.filename, inpak);
sect.file_position = 12;
sect.file_length = sizeof(byte) * count;
//now write the dirsection
fwrite(§, sizeof(sect), 1, fp->handle);
}
else
{
//first check if the file already exists in the pak
//for this purpose we read all the dirsections into a buffer and then check them
if( fp->header.dir_length % 64 != 0 ) // corrupted file ?
return -1; // oh my gosh, check yer HD !
//now check how many files are in the pak
x = fp->header.dir_length / 64; //guaranteed to be even
//allocate space for all the files including one new
files = malloc((x+1) * sizeof(dirsection));
//read all the dirsections into 'files'
fseek(fp->handle, fp->header.dir_offset, SEEK_SET); //go to directory offset
fread(files, sizeof(dirsection), x, fp->handle);
//now check if the file exists
int i;
for( i = 0; i < x; i++)
{
char *name = files[i].filename;
if( strcmp(name, inpak) == 0 )
return -1; // already exists
}
//now calculate the new offset
fseek(fp->handle, 4, SEEK_SET); //go to directory offset-record
fp->header.dir_offset = fp->header.dir_offset + count;
fp->header.dir_length = fp->header.dir_length + sizeof(dirsection);
//write new offset and length
fwrite(&fp->header.dir_offset, sizeof(fp->header.dir_offset), 1, fp->handle);
fwrite(&fp->header.dir_length, sizeof(fp->header.dir_length), 1, fp->handle);
//now go to end of binary data and write the file
fseek(fp->handle, (fp->header.dir_offset - count), SEEK_SET);
fwrite(buffer, sizeof(byte), count, fp->handle);
strcpy(files[x].filename, inpak);
files[x].file_position = fp->header.dir_offset - count;
files[x].file_length = sizeof(byte) * count;
//now write the entire dirsection, since the old one has been overwritten by binary data
fwrite(files, sizeof(dirsection), x+1, fp->handle);
}
free(buffer);
return 0;
}
byte *readFile(char *filename, unsigned int *size)
{
FILE *fil;
byte c;
int b;
unsigned int count =0;
fil = fopen(filename, "r");
if( fil == NULL )
return NULL;
while(fread( &c, sizeof(c), 1, fil) > 0)
count++;
//now we have the size of the file
byte *buffer = malloc(count * sizeof(byte));
rewind(fil);
count = 0;
//now read the data into the buffer
while((b = fgetc(fil)) != EOF)
{
buffer[count] = b;
count++;
}
fclose(fil);
*size = count;
return buffer;
}
int closePak(pakfile *fp)
{
fclose(fp->handle);
free(fp);
return 0;
}
dirsection *inPak(char *file, pakfile *fp)
{
dirsection *sect = malloc(sizeof(dirsection));
int x =0;
dirsection *files = loadDirSection(fp, &x);
//now check if the file exists
int i;
for( i = 0; i < x; i++)
{
char *name = files[i].filename;
unsigned int position = files[i].file_position;
unsigned int length = files[i].file_length;
if( strcmp(name, file) == 0 )
{
strcpy(sect->filename, name);
sect->file_position = position;
sect->file_length = length;
free(files);return sect;} // exists
}
free(files);
return NULL; // does not exist
}
int extractPak(char *file, char *output, pakfile *fp)
{
FILE *fil;
if(fp == NULL)
return -1;
//first, test if the file exists in the pak
dirsection *mysect = inPak(file, fp);
if( mysect == NULL )
return -1; //not found
//open the output file
fil = fopen(output, "wb");
//now go to the address in the pak
fseek(fp->handle, mysect->file_position, SEEK_SET);
byte *buffer = malloc(mysect->file_length * sizeof(byte));
//now read the data into the buffer
fread(buffer, sizeof(byte), mysect->file_length, fp->handle);
//now write the buffer to the output file
fwrite(buffer, sizeof(byte), mysect->file_length, fil);
fclose(fil);
free(buffer);
return 0;
}
dirsection *loadDirSection(pakfile *fp, int *x)
{
dirsection *files;
//see how many files are in the pak
*x = fp->header.dir_length / 64; //guaranteed to be even
//allocate space for all the files including one new (for possible insertion)
files = malloc(*x * sizeof(dirsection));
//read all the dirsections into 'files'
fseek(fp->handle, fp->header.dir_offset, SEEK_SET); //go to directory offset
fread(files, sizeof(dirsection), *x, fp->handle);
return files;
}
void printDirTree(pakfile *fp)
{
int x;
if(fp == NULL) { printf("pak: File not found.\n"); return;}
dirsection *myfiles = loadDirSection(fp, &x);
char *name;
x--;
while( x >= 0)
{
name = myfiles[x].filename;
printf("%25s", name); //give out the pathname of the file in pak
printf("\t\t");
printf("%8i", myfiles[x].file_length); //give out the size in bytes
printf(" Bytes\n");
x--;
}
}
void printHelp()
{
printf("\nPAK "); printf("%g", VERSION); printf(" by Dominik Jall\n");
printf("-----------------------\n\n");
printf("Create and modify Quake I + II PAKfiles\n\n");
printf("Call: pak [COMMAND] [FILE] [FILE] [FILE]\n");
printf("\n\nCOMMANDs are:\n");
printf("c\tcreate a new (empty) pakfile\n");
printf("p\tprint out the directory of a pakfile\n");
printf("i\tinsert a file into a pakfile\n");
printf("v\tverify the integrity of a pakfile\n");
printf("e\textract a file from a pakfile\n\n");
printf("Hints for insertion and extraction:\n");
printf("If you want to insert a file into a PAK you need to specify three filenames:\n");
printf("1. The pakfile we are working with\n");
printf("2. The file in the real filesystem (something like ~/myfile.txt)\n");
printf("3. The file in the virtual filesystem of the PAK\n\n");
printf("Examples:\n pak i ~/myPAK.pak ~/picture.xpm bitmaps/firstpic.xpm\n");
printf(" pak e ~/myPAK.pak bitmaps/firstpic.xpm ~/picture.xpm\n");
printf("\nNOTE: If you want to extract a file, the second argument is the file within the PAK\n\n");
printf("Questions / Comments are very welcome. Yuh cyan mail me at hackebeil20@web.de\n\n");
}
int checkCmd(char* arr[])
{
char a[] = {'c','p','i','v','e'};
int b;
int c = 0;
for(b = 0; b < 5; b++)
{
int f = strncmp(arr[1], &a[b], 1);
if(f == 0)
c=1;
}
return c; //if c == 0 then no valid command has been passed
}
int getLongestFile(dirsection *files, int n)
{
int longest = 0;
int curr;
while( n >= 0)
{
curr = strlen(files[n].filename);
if( curr > longest )
longest = curr;
n--;
}
return longest;
}
#ifdef USE_SDL
SDL_Surface *loadBMP(char* file, pakfile *fp)
{
unsigned int size;
SDL_RWops *rw;
SDL_Surface *plane;
// this function uses the undocumented SDL_RWops-feature that allows
// loading images from almost any source, like memorypointers, pipes etc.
//first, read the file within the pak into a buffer
byte *buffer = extractMem(file, fp, &size);
if(buffer == NULL)
return NULL;
//now that we have the file as memory, we need to make a SDL_RWop-struct from it
rw = SDL_RWFromMem(buffer, size);
//now load the BMP in an ordinary way
plane = SDL_LoadBMP_RW(rw, 0);
//at last, free all unnecessary stuff
free(buffer);
SDL_FreeRW(rw);
return plane;
}
byte *extractMem(char *file, pakfile* fp, unsigned int *size)
{
if(fp == NULL)
return NULL;
//test if the file exists in the pak
dirsection *mysect = inPak(file, fp);
if( mysect == NULL )
return NULL; //not found
//now go to the address in the pak
fseek(fp->handle, mysect->file_position, SEEK_SET);
byte *buffer = malloc(mysect->file_length * sizeof(byte));
*size = mysect->file_length;
//now read the data into the buffer
fread(buffer, sizeof(byte), mysect->file_length, fp->handle);
return buffer;
}
#endif