--- /dev/null
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+
+#define ZSTD_STATIC_LINKING_ONLY
+#include "zstd.h"
+#include "zstd_errors.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+typedef struct {
+ char *input;
+ size_t input_size;
+
+ char *perturbed; /* same size as input */
+
+ char *output;
+ size_t output_size;
+
+ const char *dict_file_name;
+ const char *dict_file_dir_name;
+ int32_t dict_id;
+ char *dict;
+ size_t dict_size;
+ ZSTD_DDict* ddict;
+
+ ZSTD_DCtx* dctx;
+
+ int success_count;
+ int error_counts[ZSTD_error_maxCode];
+} stuff_t;
+
+static void free_stuff(stuff_t* stuff) {
+ free(stuff->input);
+ free(stuff->output);
+ ZSTD_freeDDict(stuff->ddict);
+ free(stuff->dict);
+ ZSTD_freeDCtx(stuff->dctx);
+}
+
+static void usage(void) {
+ fprintf(stderr, "check_flipped_bits input_filename [-d dict] [-D dict_dir]\n");
+ fprintf(stderr, "\n");
+ fprintf(stderr, "Arguments:\n");
+ fprintf(stderr, " -d file: path to a dictionary file to use.\n");
+ fprintf(stderr, " -D dir : path to a directory, with files containing dictionaries, of the\n"
+ " form DICTID.zstd-dict, e.g., 12345.zstd-dict.\n");
+ exit(1);
+}
+
+static void print_summary(stuff_t* stuff) {
+ int error_code;
+ fprintf(stderr, "%9d successful decompressions\n", stuff->success_count);
+ for (error_code = 0; error_code < ZSTD_error_maxCode; error_code++) {
+ int count = stuff->error_counts[error_code];
+ if (count) {
+ fprintf(
+ stderr, "%9d failed decompressions with message: %s\n",
+ count, ZSTD_getErrorString(error_code));
+ }
+ }
+}
+
+static char* readFile(const char* filename, size_t* size) {
+ struct stat statbuf;
+ int ret;
+ FILE* f;
+ char *buf;
+ size_t bytes_read;
+
+ ret = stat(filename, &statbuf);
+ if (ret != 0) {
+ fprintf(stderr, "stat failed: %m\n");
+ return NULL;
+ }
+ if ((statbuf.st_mode & S_IFREG) != S_IFREG) {
+ fprintf(stderr, "Input must be regular file\n");
+ return NULL;
+ }
+
+ *size = statbuf.st_size;
+
+ f = fopen(filename, "r");
+ if (f == NULL) {
+ fprintf(stderr, "fopen failed: %m\n");
+ return NULL;
+ }
+
+ buf = malloc(*size);
+ if (buf == NULL) {
+ fprintf(stderr, "malloc failed\n");
+ fclose(f);
+ return NULL;
+ }
+
+ bytes_read = fread(buf, 1, *size, f);
+ if (bytes_read != *size) {
+ fprintf(stderr, "failed to read whole file\n");
+ fclose(f);
+ free(buf);
+ return NULL;
+ }
+
+ ret = fclose(f);
+ if (ret != 0) {
+ fprintf(stderr, "fclose failed: %m\n");
+ free(buf);
+ return NULL;
+ }
+
+ return buf;
+}
+
+static ZSTD_DDict* readDict(const char* filename, char **buf, size_t* size, int32_t* dict_id) {
+ ZSTD_DDict* ddict;
+ *buf = readFile(filename, size);
+ if (*buf == NULL) {
+ fprintf(stderr, "Opening dictionary file '%s' failed\n", filename);
+ return NULL;
+ }
+
+ ddict = ZSTD_createDDict_advanced(*buf, *size, ZSTD_dlm_byRef, ZSTD_dct_auto, ZSTD_defaultCMem);
+ if (ddict == NULL) {
+ fprintf(stderr, "Failed to create ddict.\n");
+ return NULL;
+ }
+ if (dict_id != NULL) {
+ *dict_id = ZSTD_getDictID_fromDDict(ddict);
+ }
+ return ddict;
+}
+
+static ZSTD_DDict* readDictByID(stuff_t *stuff, int32_t dict_id, char **buf, size_t* size) {
+ if (stuff->dict_file_dir_name == NULL) {
+ return NULL;
+ } else {
+ size_t dir_name_len = strlen(stuff->dict_file_dir_name);
+ int dir_needs_separator = 0;
+ size_t dict_file_name_alloc_size = dir_name_len + 1 /* '/' */ + 10 /* max int32_t len */ + strlen(".zstd-dict") + 1 /* '\0' */;
+ char *dict_file_name = malloc(dict_file_name_alloc_size);
+ ZSTD_DDict* ddict;
+ int32_t read_dict_id;
+ if (dict_file_name == NULL) {
+ fprintf(stderr, "malloc failed.\n");
+ return 0;
+ }
+
+ if (dir_name_len > 0 && stuff->dict_file_dir_name[dir_name_len - 1] != '/') {
+ dir_needs_separator = 1;
+ }
+
+ snprintf(
+ dict_file_name,
+ dict_file_name_alloc_size,
+ "%s%s%u.zstd-dict",
+ stuff->dict_file_dir_name,
+ dir_needs_separator ? "/" : "",
+ dict_id);
+
+ /* fprintf(stderr, "Loading dict %u from '%s'.\n", dict_id, dict_file_name); */
+
+ ddict = readDict(dict_file_name, buf, size, &read_dict_id);
+ if (ddict == NULL) {
+ fprintf(stderr, "Failed to create ddict from '%s'.\n", dict_file_name);
+ free(dict_file_name);
+ return 0;
+ }
+ if (read_dict_id != dict_id) {
+ fprintf(stderr, "Read dictID (%u) does not match expected (%u).\n", read_dict_id, dict_id);
+ free(dict_file_name);
+ ZSTD_freeDDict(ddict);
+ return 0;
+ }
+
+ free(dict_file_name);
+ return ddict;
+ }
+}
+
+static int init_stuff(stuff_t* stuff, int argc, char *argv[]) {
+ const char* input_filename;
+
+ if (argc < 2) {
+ usage();
+ }
+
+ input_filename = argv[1];
+ stuff->input_size = 0;
+ stuff->input = readFile(input_filename, &stuff->input_size);
+ if (stuff->input == NULL) {
+ fprintf(stderr, "Failed to read input file.\n");
+ return 0;
+ }
+
+ stuff->perturbed = malloc(stuff->input_size);
+ if (stuff->perturbed == NULL) {
+ fprintf(stderr, "malloc failed.\n");
+ return 0;
+ }
+ memcpy(stuff->perturbed, stuff->input, stuff->input_size);
+
+ stuff->output_size = ZSTD_DStreamOutSize();
+ stuff->output = malloc(stuff->output_size);
+ if (stuff->output == NULL) {
+ fprintf(stderr, "malloc failed.\n");
+ return 0;
+ }
+
+ stuff->dict_file_name = NULL;
+ stuff->dict_file_dir_name = NULL;
+ stuff->dict_id = 0;
+ stuff->dict = NULL;
+ stuff->dict_size = 0;
+ stuff->ddict = NULL;
+
+ if (argc > 2) {
+ if (!strcmp(argv[2], "-d")) {
+ if (argc > 3) {
+ stuff->dict_file_name = argv[3];
+ } else {
+ usage();
+ }
+ } else
+ if (!strcmp(argv[2], "-D")) {
+ if (argc > 3) {
+ stuff->dict_file_dir_name = argv[3];
+ } else {
+ usage();
+ }
+ } else {
+ usage();
+ }
+ }
+
+ if (stuff->dict_file_dir_name) {
+ int32_t dict_id = ZSTD_getDictID_fromFrame(stuff->input, stuff->input_size);
+ if (dict_id != 0) {
+ stuff->ddict = readDictByID(stuff, dict_id, &stuff->dict, &stuff->dict_size);
+ if (stuff->ddict == NULL) {
+ fprintf(stderr, "Failed to create cached ddict.\n");
+ return 0;
+ }
+ stuff->dict_id = dict_id;
+ }
+ } else
+ if (stuff->dict_file_name) {
+ stuff->ddict = readDict(stuff->dict_file_name, &stuff->dict, &stuff->dict_size, &stuff->dict_id);
+ if (stuff->ddict == NULL) {
+ fprintf(stderr, "Failed to create ddict from '%s'.\n", stuff->dict_file_name);
+ return 0;
+ }
+ }
+
+ stuff->dctx = ZSTD_createDCtx();
+ if (stuff->dctx == NULL) {
+ return 0;
+ }
+
+ stuff->success_count = 0;
+ memset(stuff->error_counts, 0, sizeof(stuff->error_counts));
+
+ return 1;
+}
+
+static int test_decompress(stuff_t* stuff) {
+ size_t ret;
+ ZSTD_inBuffer in = {stuff->perturbed, stuff->input_size, 0};
+ ZSTD_outBuffer out = {stuff->output, stuff->output_size, 0};
+ ZSTD_DCtx* dctx = stuff->dctx;
+ int32_t custom_dict_id = ZSTD_getDictID_fromFrame(in.src, in.size);
+ char *custom_dict = NULL;
+ size_t custom_dict_size = 0;
+ ZSTD_DDict* custom_ddict = NULL;
+
+ if (custom_dict_id != 0 && custom_dict_id != stuff->dict_id) {
+ /* fprintf(stderr, "Instead of dict %u, this perturbed blob wants dict %u.\n", stuff->dict_id, custom_dict_id); */
+ custom_ddict = readDictByID(stuff, custom_dict_id, &custom_dict, &custom_dict_size);
+ }
+
+ ZSTD_DCtx_reset(dctx, ZSTD_reset_session_only);
+
+ if (custom_ddict != NULL) {
+ ZSTD_DCtx_refDDict(dctx, custom_ddict);
+ } else {
+ ZSTD_DCtx_refDDict(dctx, stuff->ddict);
+ }
+
+ while (in.pos != in.size) {
+ out.pos = 0;
+ ret = ZSTD_decompressStream(dctx, &out, &in);
+
+ if (ZSTD_isError(ret)) {
+ unsigned int code = ZSTD_getErrorCode(ret);
+ if (code >= ZSTD_error_maxCode) {
+ fprintf(stderr, "Received unexpected error code!\n");
+ exit(1);
+ }
+ stuff->error_counts[code]++;
+ /*
+ fprintf(
+ stderr, "Decompression failed: %s\n", ZSTD_getErrorName(ret));
+ */
+ if (custom_ddict != NULL) {
+ ZSTD_freeDDict(custom_ddict);
+ free(custom_dict);
+ }
+ return 0;
+ }
+ }
+
+ stuff->success_count++;
+
+ if (custom_ddict != NULL) {
+ ZSTD_freeDDict(custom_ddict);
+ free(custom_dict);
+ }
+ return 1;
+}
+
+static int perturb_bits(stuff_t* stuff) {
+ size_t pos;
+ size_t bit;
+ for (pos = 0; pos < stuff->input_size; pos++) {
+ unsigned char old_val = stuff->input[pos];
+ if (pos % 1000 == 0) {
+ fprintf(stderr, "Perturbing byte %zu / %zu\n", pos, stuff->input_size);
+ }
+ for (bit = 0; bit < 8; bit++) {
+ unsigned char new_val = old_val ^ (1 << bit);
+ stuff->perturbed[pos] = new_val;
+ if (test_decompress(stuff)) {
+ fprintf(
+ stderr,
+ "Flipping byte %zu bit %zu (0x%02x -> 0x%02x) "
+ "produced a successful decompression!\n",
+ pos, bit, old_val, new_val);
+ }
+ }
+ stuff->perturbed[pos] = old_val;
+ }
+ return 1;
+}
+
+static int perturb_bytes(stuff_t* stuff) {
+ size_t pos;
+ size_t new_val;
+ for (pos = 0; pos < stuff->input_size; pos++) {
+ unsigned char old_val = stuff->input[pos];
+ if (pos % 1000 == 0) {
+ fprintf(stderr, "Perturbing byte %zu / %zu\n", pos, stuff->input_size);
+ }
+ for (new_val = 0; new_val < 256; new_val++) {
+ stuff->perturbed[pos] = new_val;
+ if (test_decompress(stuff)) {
+ fprintf(
+ stderr,
+ "Changing byte %zu (0x%02x -> 0x%02x) "
+ "produced a successful decompression!\n",
+ pos, old_val, (unsigned char)new_val);
+ }
+ }
+ stuff->perturbed[pos] = old_val;
+ }
+ return 1;
+}
+
+int main(int argc, char* argv[]) {
+ stuff_t stuff;
+
+ if(!init_stuff(&stuff, argc, argv)) {
+ fprintf(stderr, "Failed to init.\n");
+ return 1;
+ }
+
+ if (test_decompress(&stuff)) {
+ fprintf(stderr, "Blob already decompresses successfully!\n");
+ return 1;
+ }
+
+ perturb_bits(&stuff);
+
+ perturb_bytes(&stuff);
+
+ print_summary(&stuff);
+
+ free_stuff(&stuff);
+
+ return 0;
+}
notaz.gp2x.de / pcsx_rearmed.git / blobdiff