sateallia/cso-thumbnailer
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Sateallia 2024-02-29 02:34:33 +03:00
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LICENSE Normal file
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Copyright © 2024 Sateallia
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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Makefile Normal file
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CC=gcc
CFLAGS=-Wall -Wextra -Wshadow -Wstrict-aliasing -pedantic -std=c99 -O2 $(shell pkg-config --cflags zlib)
LDDFLAGS=$(shell pkg-config --libs zlib)
ifndef VERBOSE
.SILENT:
endif
all: clean main
main: main.c
$(CC) $(CFLAGS) main.c -o cso-thumbnailer $(LDDFLAGS)
install: main
cp cso-thumbnailer /usr/local/bin/cso-thumbnailer
cp cso.thumbnailer /usr/share/thumbnailers/cso.thumbnailer
uninstall:
rm /usr/local/bin/cso-thumbnailer
rm /usr/share/thumbnailers/cso.thumbnailer
clean:
rm -f cso-thumbnailer *.o

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cso.thumbnailer Normal file
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[Thumbnailer Entry]
TryExec=/usr/local/bin/cso-thumbnailer
Exec=/usr/local/bin/cso-thumbnailer %i %o
MimeType=application/x-compressed-iso;

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main.c Normal file
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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <math.h>
#include <inttypes.h>
#include <zlib.h>
#include <zconf.h>
#define CISO_MAGIC 0x4F534943 // "CISO"
#define ZISO_MAGIC 0x4F53495A // "ZISO"
#define MB64_IN_BYTES 64 * 1024 * 1024
unsigned char header_pvd[6] = {0x01, 0x43, 0x44, 0x30, 0x30, 0x31}; // 0x01 + "CD001"
unsigned char magic_psp[8] = {0x50, 0x53, 0x50, 0x20, 0x47, 0x41, 0x4D, 0x45}; // "PSP GAME"
unsigned char record_icon0[10] = {0x09, 0x49, 0x43, 0x4F, 0x4E, 0x30, 0x2E, 0x50, 0x4E, 0x47}; // 0x09 + "ICON0.PNG"
int *file_iso;
FILE *ptr_input;
int magic;
int alignment_index;
int size_block;
uint32_t *buffer_index;
uint8_t *buffer_output;
uint8_t *buffer_input;
void error_and_exit(char *error) {
printf(error);
exit(-1);
}
void decompress(uint64_t total_block) {
int size_cmp = 0;
int counter = 0;
for(uint64_t block = 0; block < total_block; block++) {
uint32_t index = buffer_index[block];
int plain = index & 0x80000000;
index = index & 0x7fffffff;
uint64_t pos_read = index << (alignment_index);
uint64_t size_read;
if(plain) size_read = size_block;
else {
uint32_t index_2 = buffer_index[block + 1] & 0x7fffffff;
if(alignment_index) size_read = (index_2 - index + 1) << alignment_index;
else size_read = (index_2 - index) << (alignment_index);
}
fseek(ptr_input, pos_read, SEEK_SET);
z_stream infstream;
infstream.zalloc = Z_NULL;
infstream.zfree = Z_NULL;
infstream.opaque = Z_NULL;
infstream.avail_in = fread(buffer_input, 1, size_read, ptr_input);
if(plain) {
memcpy(buffer_output, buffer_input, size_read);
size_cmp = size_read;
} else {
if(magic == CISO_MAGIC) {
infstream.next_in = buffer_input;
infstream.avail_out = size_block;
infstream.next_out = buffer_output;
inflateInit2(&infstream, -MAX_WBITS);
inflate(&infstream, Z_NO_FLUSH);
inflateEnd(&infstream);
size_cmp = size_block - infstream.avail_out;
} else if(magic == ZISO_MAGIC) error_and_exit("ZISO format not supported yet, sorry\n");
}
memcpy(file_iso + (counter / sizeof(uint32_t)), buffer_output, size_cmp);
counter += size_cmp;
}
rewind(ptr_input);
}
int main(int argc, char **argv) {
if(argc != 3) error_and_exit("USAGE: <inputfile> <outputfile>\n");
ptr_input = fopen(argv[1], "r");
if (ptr_input == NULL) error_and_exit("Error opening input file\n");
FILE *ptr_output = fopen(argv[2], "wb");
if (ptr_output == NULL) error_and_exit("Error opening output file\n");
fseek(ptr_input, 0L, SEEK_END);
uint64_t size_file = ftell(ptr_input);
rewind(ptr_input);
if(size_file < 32) error_and_exit("Input file too small to be valid\n");
// TODO: will this break on different endians?
unsigned char header_cso[0x18];
fread(header_cso, 1, sizeof(header_cso), ptr_input);
magic = header_cso[0x0] + (header_cso[0x1] << 8) + (header_cso[0x2] << 16) + (header_cso[0x3] << 24);
if(magic != CISO_MAGIC && magic != ZISO_MAGIC) error_and_exit("File couldn't be identified as CISO or ZISO\n");
uint64_t size_uncompressed = 0;
for(int i = 7; i >= 0; --i) {
size_uncompressed <<= 8;
size_uncompressed |= (uint64_t)header_cso[0x8 + i];
}
size_block = header_cso[0x10] + (header_cso[0x11] << 8) + (header_cso[0x12] << 16) + (header_cso[0x13] << 24);
int version = header_cso[0x14];
alignment_index = header_cso[0x15];
if((magic == ZISO_MAGIC && version != 1) || !size_uncompressed || !size_block) error_and_exit("Corrupt header in specified ZISO file\n");
int total_block = floor(size_uncompressed / size_block);
int limit64mb_block = floor(MB64_IN_BYTES / size_block);
if(total_block > limit64mb_block) total_block = limit64mb_block; // First 64MB should be enough to get the location of the file, we can decrypt more if needed later
int size_index = (total_block + 1) * sizeof(uint32_t);
buffer_index = calloc(1, size_index);
buffer_output = calloc(1, size_block);
buffer_input = calloc(1, size_block * 2);
file_iso = (int*) calloc(1, size_uncompressed * sizeof(int));
if(!buffer_index || !buffer_output || !buffer_input || !file_iso) error_and_exit("Couldn't allocate enough memory\n");
fread(buffer_index, 1, size_index, ptr_input);
decompress(total_block);
uint64_t *location_pvd = memmem(file_iso, size_uncompressed * sizeof(int), header_pvd, sizeof(header_pvd));
unsigned char pvd[2048] = {0};
unsigned char magic_iso[8] = {0};
unsigned char first18bytes[18] = {0};
memcpy(&pvd, location_pvd, 2048);
for(int i = 0; i < 8; i++) magic_iso[i] = pvd[8 + i];
for(int i = 0; i < 8; i++) if(magic_iso[i] != magic_psp[i]) error_and_exit("File couldn't be identified as PSP ISO\n");
uint64_t *location_record_icon0_name = memmem(file_iso, size_uncompressed * sizeof(int), record_icon0, sizeof(record_icon0));
uint64_t *location_record_icon0 = location_record_icon0_name - 4;
memcpy(&first18bytes, location_record_icon0, 18);
int location = first18bytes[2] + (first18bytes[3] << 8) + (first18bytes[4] << 16) + (first18bytes[5] << 24);
location = location * size_block;
int size = first18bytes[10] + (first18bytes[11] << 8) + (first18bytes[12] << 16) + (first18bytes[13] << 24);
int *png = (int*) malloc(size * sizeof(int));
if((location + size + (2048 * 8)) > MB64_IN_BYTES) { // I forgot why I add (2048 * 8) since my first prototype two years ago, sorry...
free(buffer_index);
free(file_iso);
total_block = floor((location + size + (2048 * 8)) / size_block);
size_index = (total_block + 1) * sizeof(uint32_t);
memset(buffer_output, 0, size_block);
memset(buffer_input, 0, size_block * 2);
buffer_index = calloc(1, size_index);
file_iso = (int*) calloc(1, (location + size + (2048 * 8)) * sizeof(int));
if(!buffer_index || !buffer_output || !buffer_input || !file_iso) error_and_exit("Couldn't allocate enough memory\n");
fread(header_cso, 1, sizeof(header_cso), ptr_input);
fread(buffer_index, 1, size_index, ptr_input);
decompress(total_block);
}
memcpy(png, (file_iso + (location / sizeof(int))), size);
fwrite(png, 1, size, ptr_output);
fclose(ptr_output);
fclose(ptr_input);
free(buffer_index);
free(buffer_output);
free(buffer_input);
}