| /* minigzip.c -- simulate gzip using the zlib compression library |
| * Copyright (C) 1995-2006, 2010, 2011, 2016 Jean-loup Gailly |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| */ |
| |
| /* |
| * minigzip is a minimal implementation of the gzip utility. This is |
| * only an example of using zlib and isn't meant to replace the |
| * full-featured gzip. No attempt is made to deal with file systems |
| * limiting names to 14 or 8+3 characters, etc... Error checking is |
| * very limited. So use minigzip only for testing; use gzip for the |
| * real thing. |
| */ |
| |
| /* @(#) $Id$ */ |
| |
| #include "zlib.h" |
| #include <stdio.h> |
| #include <assert.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <inttypes.h> |
| |
| #ifdef USE_MMAP |
| # include <sys/types.h> |
| # include <sys/mman.h> |
| # include <sys/stat.h> |
| #endif |
| |
| #ifndef UNALIGNED_OK |
| # include <malloc.h> |
| #endif |
| |
| #if defined(WIN32) || defined(__CYGWIN__) |
| # include <fcntl.h> |
| # include <io.h> |
| # define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY) |
| #else |
| # define SET_BINARY_MODE(file) |
| #endif |
| |
| #if defined(_MSC_VER) && _MSC_VER < 1900 |
| # define snprintf _snprintf |
| #endif |
| |
| #if !defined(Z_HAVE_UNISTD_H) && !defined(_LARGEFILE64_SOURCE) |
| #ifndef WIN32 /* unlink already in stdio.h for WIN32 */ |
| extern int unlink (const char *); |
| #endif |
| #endif |
| |
| #ifndef GZ_SUFFIX |
| # define GZ_SUFFIX ".gz" |
| #endif |
| #define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1) |
| |
| #define BUFLEN 16384 /* read buffer size */ |
| #define BUFLENW (BUFLEN * 3) /* write buffer size */ |
| #define MAX_NAME_LEN 1024 |
| |
| #ifdef Z_SOLO |
| /* for Z_SOLO, create simplified gz* functions using deflate and inflate */ |
| |
| #if defined(Z_HAVE_UNISTD_H) || defined(Z_LARGE) |
| # include <unistd.h> /* for unlink() */ |
| #endif |
| |
| void *myalloc (void *, unsigned, unsigned); |
| void myfree (void *, void *); |
| |
| void *myalloc(void *q, unsigned n, unsigned m) |
| { |
| (void)q; |
| #ifndef UNALIGNED_OK |
| return memalign(16, n * m); |
| #else |
| return calloc(n, m); |
| #endif |
| } |
| |
| void myfree(void *q, void *p) |
| { |
| (void)q; |
| free(p); |
| } |
| |
| typedef struct gzFile_s { |
| FILE *file; |
| int write; |
| int err; |
| const char *msg; |
| z_stream strm; |
| unsigned char *buf; |
| } *gzFile; |
| |
| gzFile gzopen(const char *, const char *); |
| gzFile gzdopen(int, const char *); |
| gzFile gz_open (const char *, int, const char *); |
| |
| gzFile gzopen(const char *path, const char *mode) |
| { |
| return gz_open(path, -1, mode); |
| } |
| |
| gzFile gzdopen(int fd, const char *mode) |
| { |
| return gz_open(NULL, fd, mode); |
| } |
| |
| gzFile gz_open(const char *path, int fd, const char *mode) |
| { |
| gzFile gz; |
| int ret; |
| int level = Z_DEFAULT_COMPRESSION; |
| const char *plevel = mode; |
| |
| gz = malloc(sizeof(struct gzFile_s)); |
| if (gz == NULL) |
| return NULL; |
| gz->write = strchr(mode, 'w') != NULL; |
| gz->strm.zalloc = myalloc; |
| gz->strm.zfree = myfree; |
| gz->strm.opaque = NULL; |
| gz->buf = malloc(gz->write ? BUFLENW : BUFLEN); |
| |
| if (gz->buf == NULL) { |
| free(gz); |
| return NULL; |
| } |
| |
| while (*plevel) { |
| if (*plevel >= '0' && *plevel <= '9') { |
| level = *plevel - '0'; |
| break; |
| } |
| plevel++; |
| } |
| if (gz->write) |
| ret = deflateInit2(&(gz->strm), level, 8, 15 + 16, 8, 0); |
| else { |
| gz->strm.next_in = NULL; |
| gz->strm.avail_in = 0; |
| ret = inflateInit2(&(gz->strm), 15 + 16); |
| } |
| if (ret != Z_OK) { |
| free(gz); |
| return NULL; |
| } |
| gz->file = path == NULL ? fdopen(fd, gz->write ? "wb" : "rb") : |
| fopen(path, gz->write ? "wb" : "rb"); |
| if (gz->file == NULL) { |
| gz->write ? deflateEnd(&(gz->strm)) : inflateEnd(&(gz->strm)); |
| free(gz); |
| return NULL; |
| } |
| gz->err = 0; |
| gz->msg = ""; |
| return gz; |
| } |
| |
| int gzwrite(gzFile, const void *, unsigned); |
| |
| int gzwrite(gzFile gz, const void *buf, unsigned len) |
| { |
| z_stream *strm; |
| |
| if (gz == NULL || !gz->write) |
| return 0; |
| strm = &(gz->strm); |
| strm->next_in = (void *)buf; |
| strm->avail_in = len; |
| do { |
| strm->next_out = gz->buf; |
| strm->avail_out = BUFLENW; |
| (void)deflate(strm, Z_NO_FLUSH); |
| fwrite(gz->buf, 1, BUFLENW - strm->avail_out, gz->file); |
| } while (strm->avail_out == 0); |
| return len; |
| } |
| |
| int gzread(gzFile, void *, unsigned); |
| |
| int gzread(gzFile gz, void *buf, unsigned len) |
| { |
| z_stream *strm; |
| |
| if (gz == NULL || gz->write || gz->err) |
| return 0; |
| strm = &(gz->strm); |
| strm->next_out = buf; |
| strm->avail_out = len; |
| do { |
| if (strm->avail_in == 0) |
| { |
| strm->next_in = gz->buf; |
| strm->avail_in = (uint32_t)fread(gz->buf, 1, BUFLEN, gz->file); |
| } |
| if (strm->avail_in > 0) |
| { |
| int ret = inflate(strm, Z_NO_FLUSH); |
| if (ret == Z_DATA_ERROR) { |
| gz->err = ret; |
| gz->msg = strm->msg; |
| return 0; |
| } |
| else if (ret == Z_STREAM_END) |
| inflateReset(strm); |
| } |
| else |
| break; |
| } while (strm->avail_out); |
| return len - strm->avail_out; |
| } |
| |
| int gzclose(gzFile); |
| |
| int gzclose(gzFile gz) |
| { |
| z_stream *strm; |
| |
| if (gz == NULL) |
| return Z_STREAM_ERROR; |
| strm = &(gz->strm); |
| if (gz->write) { |
| strm->next_in = NULL; |
| strm->avail_in = 0; |
| do { |
| strm->next_out = gz->buf; |
| strm->avail_out = BUFLENW; |
| (void)deflate(strm, Z_FINISH); |
| fwrite(gz->buf, 1, BUFLENW - strm->avail_out, gz->file); |
| } while (strm->avail_out == 0); |
| deflateEnd(strm); |
| } |
| else |
| inflateEnd(strm); |
| free(gz->buf); |
| fclose(gz->file); |
| free(gz); |
| return Z_OK; |
| } |
| |
| const char *gzerror(gzFile, int *); |
| |
| const char *gzerror(gzFile gz, int *err) |
| { |
| *err = gz->err; |
| return gz->msg; |
| } |
| |
| #endif |
| |
| static char *prog; |
| |
| void error (const char *msg); |
| void gz_compress (FILE *in, gzFile out); |
| #ifdef USE_MMAP |
| int gz_compress_mmap (FILE *in, gzFile out); |
| #endif |
| void gz_uncompress (gzFile in, FILE *out); |
| void file_compress (char *file, char *mode); |
| void file_uncompress (char *file); |
| int main (int argc, char *argv[]); |
| |
| /* =========================================================================== |
| * Display error message and exit |
| */ |
| void error(const char *msg) |
| { |
| fprintf(stderr, "%s: %s\n", prog, msg); |
| exit(1); |
| } |
| |
| /* =========================================================================== |
| * Compress input to output then close both files. |
| */ |
| |
| void gz_compress(FILE *in, gzFile out) |
| { |
| char buf[BUFLEN]; |
| int len; |
| int err; |
| |
| #ifdef USE_MMAP |
| /* Try first compressing with mmap. If mmap fails (minigzip used in a |
| * pipe), use the normal fread loop. |
| */ |
| if (gz_compress_mmap(in, out) == Z_OK) return; |
| #endif |
| /* Clear out the contents of buf before reading from the file to avoid |
| MemorySanitizer: use-of-uninitialized-value warnings. */ |
| memset(buf, 0, sizeof(buf)); |
| for (;;) { |
| len = (int)fread(buf, 1, sizeof(buf), in); |
| if (ferror(in)) { |
| perror("fread"); |
| exit(1); |
| } |
| if (len == 0) break; |
| |
| if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err)); |
| } |
| fclose(in); |
| if (gzclose(out) != Z_OK) error("failed gzclose"); |
| } |
| |
| #ifdef USE_MMAP /* MMAP version, Miguel Albrecht <malbrech@eso.org> */ |
| |
| /* Try compressing the input file at once using mmap. Return Z_OK if |
| * if success, Z_ERRNO otherwise. |
| */ |
| int gz_compress_mmap(FILE *in, gzFile out) |
| { |
| int len; |
| int err; |
| int ifd = fileno(in); |
| caddr_t buf; /* mmap'ed buffer for the entire input file */ |
| off_t buf_len; /* length of the input file */ |
| struct stat sb; |
| |
| /* Determine the size of the file, needed for mmap: */ |
| if (fstat(ifd, &sb) < 0) return Z_ERRNO; |
| buf_len = sb.st_size; |
| if (buf_len <= 0) return Z_ERRNO; |
| |
| /* Now do the actual mmap: */ |
| buf = mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0); |
| if (buf == (caddr_t)(-1)) return Z_ERRNO; |
| |
| /* Compress the whole file at once: */ |
| len = gzwrite(out, (char *)buf, (unsigned)buf_len); |
| |
| if (len != (int)buf_len) error(gzerror(out, &err)); |
| |
| munmap(buf, buf_len); |
| fclose(in); |
| if (gzclose(out) != Z_OK) error("failed gzclose"); |
| return Z_OK; |
| } |
| #endif /* USE_MMAP */ |
| |
| /* =========================================================================== |
| * Uncompress input to output then close both files. |
| */ |
| void gz_uncompress(gzFile in, FILE *out) |
| { |
| char buf[BUFLENW]; |
| int len; |
| int err; |
| |
| for (;;) { |
| len = gzread(in, buf, sizeof(buf)); |
| if (len < 0) error (gzerror(in, &err)); |
| if (len == 0) break; |
| |
| if ((int)fwrite(buf, 1, (unsigned)len, out) != len) { |
| error("failed fwrite"); |
| } |
| } |
| if (fclose(out)) error("failed fclose"); |
| |
| if (gzclose(in) != Z_OK) error("failed gzclose"); |
| } |
| |
| |
| /* =========================================================================== |
| * Compress the given file: create a corresponding .gz file and remove the |
| * original. |
| */ |
| void file_compress(char *file, char *mode) |
| { |
| char outfile[MAX_NAME_LEN]; |
| FILE *in; |
| gzFile out; |
| |
| if (strlen(file) + strlen(GZ_SUFFIX) >= sizeof(outfile)) { |
| fprintf(stderr, "%s: filename too long\n", prog); |
| exit(1); |
| } |
| |
| snprintf(outfile, sizeof(outfile), "%s%s", file, GZ_SUFFIX); |
| |
| in = fopen(file, "rb"); |
| if (in == NULL) { |
| perror(file); |
| exit(1); |
| } |
| out = gzopen(outfile, mode); |
| if (out == NULL) { |
| fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile); |
| exit(1); |
| } |
| gz_compress(in, out); |
| |
| unlink(file); |
| } |
| |
| |
| /* =========================================================================== |
| * Uncompress the given file and remove the original. |
| */ |
| void file_uncompress(char *file) |
| { |
| char buf[MAX_NAME_LEN]; |
| char *infile, *outfile; |
| FILE *out; |
| gzFile in; |
| size_t len = strlen(file); |
| |
| if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) { |
| fprintf(stderr, "%s: filename too long\n", prog); |
| exit(1); |
| } |
| |
| snprintf(buf, sizeof(buf), "%s", file); |
| |
| if (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0) { |
| infile = file; |
| outfile = buf; |
| outfile[len-3] = '\0'; |
| } else { |
| outfile = file; |
| infile = buf; |
| snprintf(buf + len, sizeof(buf) - len, "%s", GZ_SUFFIX); |
| } |
| in = gzopen(infile, "rb"); |
| if (in == NULL) { |
| fprintf(stderr, "%s: can't gzopen %s\n", prog, infile); |
| exit(1); |
| } |
| out = fopen(outfile, "wb"); |
| if (out == NULL) { |
| perror(file); |
| exit(1); |
| } |
| |
| gz_uncompress(in, out); |
| |
| unlink(infile); |
| } |
| |
| int LLVMFuzzerTestOneInput(const uint8_t *data, size_t dataLen) { |
| char *inFileName = "/tmp/minigzip_fuzzer.out"; |
| char *outFileName = "/tmp/minigzip_fuzzer.out.gz"; |
| char outmode[20]; |
| FILE *in; |
| char buf[BUFLEN]; |
| uint32_t offset = 0; |
| |
| /* Discard inputs larger than 1Mb. */ |
| static size_t kMaxSize = 1024 * 1024; |
| if (dataLen < 1 || dataLen > kMaxSize) |
| return 0; |
| |
| in = fopen(inFileName, "w"); |
| if (fwrite(data, 1, (unsigned)dataLen, in) != dataLen) |
| error("failed fwrite"); |
| if (fclose(in)) |
| error("failed fclose"); |
| |
| memset(outmode, 0, sizeof(outmode)); |
| snprintf(outmode, sizeof(outmode), "%s", "wb"); |
| |
| /* Compression level: [0..9]. */ |
| outmode[2] = data[0] % 10; |
| |
| switch (data[0] % 4) { |
| default: |
| case 0: |
| outmode[3] = 0; |
| break; |
| case 1: |
| /* compress with Z_FILTERED */ |
| outmode[3] = 'f'; |
| break; |
| case 2: |
| /* compress with Z_HUFFMAN_ONLY */ |
| outmode[3] = 'h'; |
| break; |
| case 3: |
| /* compress with Z_RLE */ |
| outmode[3] = 'R'; |
| break; |
| } |
| |
| file_compress(inFileName, outmode); |
| file_uncompress(outFileName); |
| |
| /* Check that the uncompressed file matches the input data. */ |
| in = fopen(inFileName, "rb"); |
| if (in == NULL) { |
| perror(inFileName); |
| exit(1); |
| } |
| |
| memset(buf, 0, sizeof(buf)); |
| for (;;) { |
| int len = (int)fread(buf, 1, sizeof(buf), in); |
| if (ferror(in)) { |
| perror("fread"); |
| exit(1); |
| } |
| if (len == 0) |
| break; |
| assert(0 == memcmp(data + offset, buf, len)); |
| offset += len; |
| } |
| |
| if (fclose(in)) |
| error("failed fclose"); |
| |
| /* This function must return 0. */ |
| return 0; |
| } |