diff options
Diffstat (limited to 'archival/gzip.c')
| -rw-r--r-- | archival/gzip.c | 72 |
1 files changed, 45 insertions, 27 deletions
diff --git a/archival/gzip.c b/archival/gzip.c index 54bb727..53646df 100644 --- a/archival/gzip.c +++ b/archival/gzip.c @@ -110,8 +110,7 @@ static int method; /* compression method */ #ifdef DYN_ALLOC # define DECLARE(type, array, size) static type * array # define ALLOC(type, array, size) { \ - array = (type*)calloc((size_t)(((size)+1L)/2), 2*sizeof(type)); \ - if (array == NULL) error_msg(memory_exhausted); \ + array = (type*)xcalloc((size_t)(((size)+1L)/2), 2*sizeof(type)); \ } # define FREE(array) {if (array != NULL) free(array), array=NULL;} #else @@ -181,16 +180,17 @@ typedef int file_t; /* Do not use stdio */ outbuf[outcnt++] = (uch) ((w) & 0xff); \ outbuf[outcnt++] = (uch) ((ush)(w) >> 8); \ } else { \ - put_byte((uch)((w) & 0xff)); \ - put_byte((uch)((ush)(w) >> 8)); \ + put_short_when_full(w); \ } \ } /* Output a 32 bit value to the bit stream, lsb first */ +#if 0 #define put_long(n) { \ put_short((n) & 0xffff); \ put_short(((ulg)(n)) >> 16); \ } +#endif #define seekable() 0 /* force sequential output */ #define translate_eol 0 /* no option -a yet */ @@ -220,7 +220,6 @@ typedef int file_t; /* Do not use stdio */ #endif - /* from zip.c: */ static int zip (int in, int out); static int file_read (char *buf, unsigned size); @@ -248,6 +247,9 @@ static int (*read_buf) (char *buf, unsigned size); /* from util.c: */ static void flush_outbuf (void); +static void put_short_when_full (ush); + + /* lzw.h -- define the lzw functions. * Copyright (C) 1992-1993 Jean-loup Gailly. * This is free software; you can redistribute it and/or modify it under the @@ -388,18 +390,11 @@ static ulg updcrc(uch *s, unsigned n) static unsigned long crc_32_tab[256]; if (crc_table_empty) { unsigned long csr; /* crc shift register */ - unsigned long e=0; /* polynomial exclusive-or pattern */ + const unsigned long e = 0xedb88320L; /* polynomial exclusive-or pattern */ int i; /* counter for all possible eight bit values */ int k; /* byte being shifted into crc apparatus */ - /* terms of polynomial defining this crc (except x^32): */ - static const int p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26}; - - /* Make exclusive-or pattern from polynomial (0xedb88320) */ - for (i = 0; i < sizeof(p)/sizeof(int); i++) - e |= 1L << (31 - p[i]); - - /* Compute and print table of CRC's, five per line */ + /* Compute table of CRC's. */ crc_32_tab[0] = 0x00000000L; for (i = 1; i < 256; i++) { csr = i; @@ -1206,7 +1201,6 @@ typedef struct dirent dir_type; typedef RETSIGTYPE(*sig_type) (int); - /* ======================================================================== */ // int main (argc, argv) // int argc; @@ -1291,11 +1285,9 @@ int gzip_main(int argc, char **argv) /* Open input file */ inFileNum = open(ifname, O_RDONLY); - if (inFileNum < 0) + if (inFileNum < 0 || stat(ifname, &statBuf) < 0) perror_msg_and_die("%s", ifname); /* Get the time stamp on the input file. */ - if (stat(ifname, &statBuf) < 0) - perror_msg_and_die("%s", ifname); time_stamp = statBuf.st_ctime; ifile_size = statBuf.st_size; } @@ -1433,16 +1425,20 @@ int gzip_main(int argc, char **argv) #define BL_CODES 19 /* number of codes used to transfer the bit lengths */ +typedef uch extra_bits_t; -static const int extra_lbits[LENGTH_CODES] /* extra bits for each length code */ +/* extra bits for each length code */ +static const extra_bits_t extra_lbits[LENGTH_CODES] = { 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0 }; -static const int extra_dbits[D_CODES] /* extra bits for each distance code */ +/* extra bits for each distance code */ +static const extra_bits_t extra_dbits[D_CODES] = { 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13 }; -static const int extra_blbits[BL_CODES] /* extra bits for each bit length code */ +/* extra bits for each bit length code */ +static const extra_bits_t extra_blbits[BL_CODES] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 7 }; #define STORED_BLOCK 0 @@ -1537,7 +1533,7 @@ static ct_data bl_tree[2 * BL_CODES + 1]; typedef struct tree_desc { ct_data *dyn_tree; /* the dynamic tree */ ct_data *static_tree; /* corresponding static tree or NULL */ - const int *extra_bits; /* extra bits for each code or NULL */ + const extra_bits_t *extra_bits; /* extra bits for each code or NULL */ int extra_base; /* base index for extra_bits */ int elems; /* max number of elements in the tree */ int max_length; /* max bit length for the codes */ @@ -1834,7 +1830,7 @@ static void pqdownheap(ct_data *tree, int k) static void gen_bitlen(tree_desc *desc) { ct_data *tree = desc->dyn_tree; - const int *extra = desc->extra_bits; + const extra_bits_t *extra = desc->extra_bits; int base = desc->extra_base; int max_code = desc->max_code; int max_length = desc->max_length; @@ -2466,6 +2462,28 @@ static void set_file_type() static ulg crc; /* crc on uncompressed file data */ static long header_bytes; /* number of bytes in gzip header */ +static void put_short_when_full(ush w) +{ + put_byte((uch)((w) & 0xff)); + put_byte((uch)((ush)(w) >> 8)); +} + +static void put_short_function(ush n) +{ + put_short(n); +} + +static void put_long(ulg n) +{ + put_short_function((n) & 0xffff); + put_short_function(((ulg)(n)) >> 16); +} + +/* put_header_byte is used for the compressed output + * - for the initial 4 bytes that can't overflow the buffer. + */ +#define put_header_byte(c) {outbuf[outcnt++]=(uch)(c);} + /* =========================================================================== * Deflate in to out. * IN assertions: the input and output buffers are cleared. @@ -2485,11 +2503,11 @@ static int zip(int in, int out) method = DEFLATED; - put_byte(GZIP_MAGIC[0]); /* magic header */ - put_byte(GZIP_MAGIC[1]); - put_byte(DEFLATED); /* compression method */ + put_header_byte(GZIP_MAGIC[0]); /* magic header */ + put_header_byte(GZIP_MAGIC[1]); + put_header_byte(DEFLATED); /* compression method */ - put_byte(my_flags); /* general flags */ + put_header_byte(my_flags); /* general flags */ put_long(time_stamp); /* Write deflated file to zip file */ |