X-Git-Url: http://ftp.carnet.hr/pub/carnet-debian/scm?a=blobdiff_plain;f=src%2Fexternal%2Fzlib-1.2.8%2Fexamples%2Fgzjoin.c;fp=src%2Fexternal%2Fzlib-1.2.8%2Fexamples%2Fgzjoin.c;h=0000000000000000000000000000000000000000;hb=3f728675941dc69d4e544d3a880a56240a6e394a;hp=89e8098441b6b51530e207d902100fb65e194ea7;hpb=927951d1c1ad45ba9e7325f07d996154a91c911b;p=ossec-hids.git diff --git a/src/external/zlib-1.2.8/examples/gzjoin.c b/src/external/zlib-1.2.8/examples/gzjoin.c deleted file mode 100644 index 89e8098..0000000 --- a/src/external/zlib-1.2.8/examples/gzjoin.c +++ /dev/null @@ -1,449 +0,0 @@ -/* gzjoin -- command to join gzip files into one gzip file - - Copyright (C) 2004, 2005, 2012 Mark Adler, all rights reserved - version 1.2, 14 Aug 2012 - - This software is provided 'as-is', without any express or implied - warranty. In no event will the author be held liable for any damages - arising from the use of this software. - - Permission is granted to anyone to use this software for any purpose, - including commercial applications, and to alter it and redistribute it - freely, subject to the following restrictions: - - 1. The origin of this software must not be misrepresented; you must not - claim that you wrote the original software. If you use this software - in a product, an acknowledgment in the product documentation would be - appreciated but is not required. - 2. Altered source versions must be plainly marked as such, and must not be - misrepresented as being the original software. - 3. This notice may not be removed or altered from any source distribution. - - Mark Adler madler@alumni.caltech.edu - */ - -/* - * Change history: - * - * 1.0 11 Dec 2004 - First version - * 1.1 12 Jun 2005 - Changed ssize_t to long for portability - * 1.2 14 Aug 2012 - Clean up for z_const usage - */ - -/* - gzjoin takes one or more gzip files on the command line and writes out a - single gzip file that will uncompress to the concatenation of the - uncompressed data from the individual gzip files. gzjoin does this without - having to recompress any of the data and without having to calculate a new - crc32 for the concatenated uncompressed data. gzjoin does however have to - decompress all of the input data in order to find the bits in the compressed - data that need to be modified to concatenate the streams. - - gzjoin does not do an integrity check on the input gzip files other than - checking the gzip header and decompressing the compressed data. They are - otherwise assumed to be complete and correct. - - Each joint between gzip files removes at least 18 bytes of previous trailer - and subsequent header, and inserts an average of about three bytes to the - compressed data in order to connect the streams. The output gzip file - has a minimal ten-byte gzip header with no file name or modification time. - - This program was written to illustrate the use of the Z_BLOCK option of - inflate() and the crc32_combine() function. gzjoin will not compile with - versions of zlib earlier than 1.2.3. - */ - -#include /* fputs(), fprintf(), fwrite(), putc() */ -#include /* exit(), malloc(), free() */ -#include /* open() */ -#include /* close(), read(), lseek() */ -#include "zlib.h" - /* crc32(), crc32_combine(), inflateInit2(), inflate(), inflateEnd() */ - -#define local static - -/* exit with an error (return a value to allow use in an expression) */ -local int bail(char *why1, char *why2) -{ - fprintf(stderr, "gzjoin error: %s%s, output incomplete\n", why1, why2); - exit(1); - return 0; -} - -/* -- simple buffered file input with access to the buffer -- */ - -#define CHUNK 32768 /* must be a power of two and fit in unsigned */ - -/* bin buffered input file type */ -typedef struct { - char *name; /* name of file for error messages */ - int fd; /* file descriptor */ - unsigned left; /* bytes remaining at next */ - unsigned char *next; /* next byte to read */ - unsigned char *buf; /* allocated buffer of length CHUNK */ -} bin; - -/* close a buffered file and free allocated memory */ -local void bclose(bin *in) -{ - if (in != NULL) { - if (in->fd != -1) - close(in->fd); - if (in->buf != NULL) - free(in->buf); - free(in); - } -} - -/* open a buffered file for input, return a pointer to type bin, or NULL on - failure */ -local bin *bopen(char *name) -{ - bin *in; - - in = malloc(sizeof(bin)); - if (in == NULL) - return NULL; - in->buf = malloc(CHUNK); - in->fd = open(name, O_RDONLY, 0); - if (in->buf == NULL || in->fd == -1) { - bclose(in); - return NULL; - } - in->left = 0; - in->next = in->buf; - in->name = name; - return in; -} - -/* load buffer from file, return -1 on read error, 0 or 1 on success, with - 1 indicating that end-of-file was reached */ -local int bload(bin *in) -{ - long len; - - if (in == NULL) - return -1; - if (in->left != 0) - return 0; - in->next = in->buf; - do { - len = (long)read(in->fd, in->buf + in->left, CHUNK - in->left); - if (len < 0) - return -1; - in->left += (unsigned)len; - } while (len != 0 && in->left < CHUNK); - return len == 0 ? 1 : 0; -} - -/* get a byte from the file, bail if end of file */ -#define bget(in) (in->left ? 0 : bload(in), \ - in->left ? (in->left--, *(in->next)++) : \ - bail("unexpected end of file on ", in->name)) - -/* get a four-byte little-endian unsigned integer from file */ -local unsigned long bget4(bin *in) -{ - unsigned long val; - - val = bget(in); - val += (unsigned long)(bget(in)) << 8; - val += (unsigned long)(bget(in)) << 16; - val += (unsigned long)(bget(in)) << 24; - return val; -} - -/* skip bytes in file */ -local void bskip(bin *in, unsigned skip) -{ - /* check pointer */ - if (in == NULL) - return; - - /* easy case -- skip bytes in buffer */ - if (skip <= in->left) { - in->left -= skip; - in->next += skip; - return; - } - - /* skip what's in buffer, discard buffer contents */ - skip -= in->left; - in->left = 0; - - /* seek past multiples of CHUNK bytes */ - if (skip > CHUNK) { - unsigned left; - - left = skip & (CHUNK - 1); - if (left == 0) { - /* exact number of chunks: seek all the way minus one byte to check - for end-of-file with a read */ - lseek(in->fd, skip - 1, SEEK_CUR); - if (read(in->fd, in->buf, 1) != 1) - bail("unexpected end of file on ", in->name); - return; - } - - /* skip the integral chunks, update skip with remainder */ - lseek(in->fd, skip - left, SEEK_CUR); - skip = left; - } - - /* read more input and skip remainder */ - bload(in); - if (skip > in->left) - bail("unexpected end of file on ", in->name); - in->left -= skip; - in->next += skip; -} - -/* -- end of buffered input functions -- */ - -/* skip the gzip header from file in */ -local void gzhead(bin *in) -{ - int flags; - - /* verify gzip magic header and compression method */ - if (bget(in) != 0x1f || bget(in) != 0x8b || bget(in) != 8) - bail(in->name, " is not a valid gzip file"); - - /* get and verify flags */ - flags = bget(in); - if ((flags & 0xe0) != 0) - bail("unknown reserved bits set in ", in->name); - - /* skip modification time, extra flags, and os */ - bskip(in, 6); - - /* skip extra field if present */ - if (flags & 4) { - unsigned len; - - len = bget(in); - len += (unsigned)(bget(in)) << 8; - bskip(in, len); - } - - /* skip file name if present */ - if (flags & 8) - while (bget(in) != 0) - ; - - /* skip comment if present */ - if (flags & 16) - while (bget(in) != 0) - ; - - /* skip header crc if present */ - if (flags & 2) - bskip(in, 2); -} - -/* write a four-byte little-endian unsigned integer to out */ -local void put4(unsigned long val, FILE *out) -{ - putc(val & 0xff, out); - putc((val >> 8) & 0xff, out); - putc((val >> 16) & 0xff, out); - putc((val >> 24) & 0xff, out); -} - -/* Load up zlib stream from buffered input, bail if end of file */ -local void zpull(z_streamp strm, bin *in) -{ - if (in->left == 0) - bload(in); - if (in->left == 0) - bail("unexpected end of file on ", in->name); - strm->avail_in = in->left; - strm->next_in = in->next; -} - -/* Write header for gzip file to out and initialize trailer. */ -local void gzinit(unsigned long *crc, unsigned long *tot, FILE *out) -{ - fwrite("\x1f\x8b\x08\0\0\0\0\0\0\xff", 1, 10, out); - *crc = crc32(0L, Z_NULL, 0); - *tot = 0; -} - -/* Copy the compressed data from name, zeroing the last block bit of the last - block if clr is true, and adding empty blocks as needed to get to a byte - boundary. If clr is false, then the last block becomes the last block of - the output, and the gzip trailer is written. crc and tot maintains the - crc and length (modulo 2^32) of the output for the trailer. The resulting - gzip file is written to out. gzinit() must be called before the first call - of gzcopy() to write the gzip header and to initialize crc and tot. */ -local void gzcopy(char *name, int clr, unsigned long *crc, unsigned long *tot, - FILE *out) -{ - int ret; /* return value from zlib functions */ - int pos; /* where the "last block" bit is in byte */ - int last; /* true if processing the last block */ - bin *in; /* buffered input file */ - unsigned char *start; /* start of compressed data in buffer */ - unsigned char *junk; /* buffer for uncompressed data -- discarded */ - z_off_t len; /* length of uncompressed data (support > 4 GB) */ - z_stream strm; /* zlib inflate stream */ - - /* open gzip file and skip header */ - in = bopen(name); - if (in == NULL) - bail("could not open ", name); - gzhead(in); - - /* allocate buffer for uncompressed data and initialize raw inflate - stream */ - junk = malloc(CHUNK); - strm.zalloc = Z_NULL; - strm.zfree = Z_NULL; - strm.opaque = Z_NULL; - strm.avail_in = 0; - strm.next_in = Z_NULL; - ret = inflateInit2(&strm, -15); - if (junk == NULL || ret != Z_OK) - bail("out of memory", ""); - - /* inflate and copy compressed data, clear last-block bit if requested */ - len = 0; - zpull(&strm, in); - start = in->next; - last = start[0] & 1; - if (last && clr) - start[0] &= ~1; - strm.avail_out = 0; - for (;;) { - /* if input used and output done, write used input and get more */ - if (strm.avail_in == 0 && strm.avail_out != 0) { - fwrite(start, 1, strm.next_in - start, out); - start = in->buf; - in->left = 0; - zpull(&strm, in); - } - - /* decompress -- return early when end-of-block reached */ - strm.avail_out = CHUNK; - strm.next_out = junk; - ret = inflate(&strm, Z_BLOCK); - switch (ret) { - case Z_MEM_ERROR: - bail("out of memory", ""); - case Z_DATA_ERROR: - bail("invalid compressed data in ", in->name); - } - - /* update length of uncompressed data */ - len += CHUNK - strm.avail_out; - - /* check for block boundary (only get this when block copied out) */ - if (strm.data_type & 128) { - /* if that was the last block, then done */ - if (last) - break; - - /* number of unused bits in last byte */ - pos = strm.data_type & 7; - - /* find the next last-block bit */ - if (pos != 0) { - /* next last-block bit is in last used byte */ - pos = 0x100 >> pos; - last = strm.next_in[-1] & pos; - if (last && clr) - in->buf[strm.next_in - in->buf - 1] &= ~pos; - } - else { - /* next last-block bit is in next unused byte */ - if (strm.avail_in == 0) { - /* don't have that byte yet -- get it */ - fwrite(start, 1, strm.next_in - start, out); - start = in->buf; - in->left = 0; - zpull(&strm, in); - } - last = strm.next_in[0] & 1; - if (last && clr) - in->buf[strm.next_in - in->buf] &= ~1; - } - } - } - - /* update buffer with unused input */ - in->left = strm.avail_in; - in->next = in->buf + (strm.next_in - in->buf); - - /* copy used input, write empty blocks to get to byte boundary */ - pos = strm.data_type & 7; - fwrite(start, 1, in->next - start - 1, out); - last = in->next[-1]; - if (pos == 0 || !clr) - /* already at byte boundary, or last file: write last byte */ - putc(last, out); - else { - /* append empty blocks to last byte */ - last &= ((0x100 >> pos) - 1); /* assure unused bits are zero */ - if (pos & 1) { - /* odd -- append an empty stored block */ - putc(last, out); - if (pos == 1) - putc(0, out); /* two more bits in block header */ - fwrite("\0\0\xff\xff", 1, 4, out); - } - else { - /* even -- append 1, 2, or 3 empty fixed blocks */ - switch (pos) { - case 6: - putc(last | 8, out); - last = 0; - case 4: - putc(last | 0x20, out); - last = 0; - case 2: - putc(last | 0x80, out); - putc(0, out); - } - } - } - - /* update crc and tot */ - *crc = crc32_combine(*crc, bget4(in), len); - *tot += (unsigned long)len; - - /* clean up */ - inflateEnd(&strm); - free(junk); - bclose(in); - - /* write trailer if this is the last gzip file */ - if (!clr) { - put4(*crc, out); - put4(*tot, out); - } -} - -/* join the gzip files on the command line, write result to stdout */ -int main(int argc, char **argv) -{ - unsigned long crc, tot; /* running crc and total uncompressed length */ - - /* skip command name */ - argc--; - argv++; - - /* show usage if no arguments */ - if (argc == 0) { - fputs("gzjoin usage: gzjoin f1.gz [f2.gz [f3.gz ...]] > fjoin.gz\n", - stderr); - return 0; - } - - /* join gzip files on command line and write to stdout */ - gzinit(&crc, &tot, stdout); - while (argc--) - gzcopy(*argv++, argc, &crc, &tot, stdout); - - /* done */ - return 0; -}