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Support old-style compress (.Z) files via libbb / unzip( ) calls

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(configurable) - When enabled an applet "uncompress" is also made
available (oddname to gunzip)
This commit is contained in:
Robert Griebl
2002-05-15 22:13:47 +00:00
parent 7ac868460a
commit f6495eb767
6 changed files with 58 additions and 4 deletions
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18
libbb/unzip.c
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@@ -65,8 +65,13 @@ static char *license_msg[] = {
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "libbb.h"
#ifdef CONFIG_FEATURE_UNCOMPRESS
int uncompress ( FILE *in, FILE *out );
#endif
static FILE *in_file, *out_file;
/* these are freed by gz_close */
@@ -911,6 +916,7 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
unsigned char flags; /* compression flags */
typedef void (*sig_type) (int);
unsigned short i;
unsigned char magic [2];
if (signal(SIGINT, SIG_IGN) != SIG_IGN) {
(void) signal(SIGINT, (sig_type) abort_gzip);
@@ -926,8 +932,18 @@ extern int unzip(FILE *l_in_file, FILE *l_out_file)
}
#endif
magic [0] = fgetc(l_in_file);
magic [1] = fgetc(l_in_file);
#ifdef CONFIG_FEATURE_UNCOMPRESS
/* Magic header for compress files, 1F 9d = \037\235 */
if (( magic [0] == 0x1F ) && ( magic [1] == 0x9d)) {
return uncompress ( l_in_file, l_out_file );
}
#endif
/* Magic header for gzip files, 1F 8B = \037\213 */
if ((fgetc(l_in_file) != 0x1F) || (fgetc(l_in_file) != 0x8b)) {
if (( magic [0] != 0x1F ) || ( magic [1] != 0x8b)) {
error_msg("Invalid gzip magic");
return EXIT_FAILURE;
}