scanlzma.c File Reference

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

Go to the source code of this file.

Macros
#define	BUFSIZE   4096

Functions
int	find_lzma_header (unsigned char *buf)
int	main (int argc, char *argv[])

Macro Definition Documentation

BUFSIZE

#define BUFSIZE   4096

Definition at line 44 of file scanlzma.c.

Function Documentation

find_lzma_header()

int find_lzma_header

(

unsigned char *

buf

)

Definition at line 46 of file scanlzma.c.

                                         {
    return (buf[0] < 0xE1
        && buf[0] == 0x5d
        && buf[4] < 0x20
        && (memcmp (buf + 10 , "\x00\x00\x00", 3) == 0
            || (memcmp (buf + 5, "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF", 8) == 0)));
}

Referenced by main().

main()

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 54 of file scanlzma.c.

                                 {
    unsigned char buf[BUFSIZE];
    int ret, i, numlzma, blocks=0;
 
    if (argc != 2) {
        printf("usage: %s numlzma < infile | lzma -c -d > outfile\n"
               "where numlzma is index of lzma file to extract, starting from zero.\n",
               argv[0]);
        exit(1);
    }
    numlzma = atoi(argv[1]);
 
    for (;;) {
        /* Read data. */
        ret = fread(buf, BUFSIZE, 1, stdin);
        if (ret != 1)
            break;
 
        /* Scan for signature. */
        for (i = 0; i<BUFSIZE-23; i++) {
            if (find_lzma_header(buf+i) && numlzma-- <= 0) {
                fwrite(buf+i, (BUFSIZE-i), 1, stdout);
                for (;;) {
                    int ch;
                    ch = getchar();
                    if (ch == EOF)
                        exit(0);
                    putchar(ch);
                }
            }
        }
        blocks++;
    }
    return 1;
}

References argv, blocks, BUFSIZE, test-lz4-list::exit, find_lzma_header(), i, and printf().