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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include "hexdump_pretty.h"
#include "gzip.h"
int main(int argc, char *argv[]) {
if (argc == 1) {
fprintf(stderr, "Usage: %s <filename.gz>\n", argv[0]);
return 1;
}
FILE *f = fopen(argv[1], "rb");
size_t len;
struct member header;
uint8_t *extra_fields = NULL;
uint16_t crc16 = 0;
char *filename = NULL;
char *file_comment = NULL;
len = fread(&header, sizeof(header), 1, f);
if (len != 1) {
fprintf(stderr, "Unexpected end of header\n");
return 1;
}
write_chunk_s((uint8_t[2]) {header.id1, header.id2}, 2);
write_chunk_s(&header.cm, 1);
write_chunk_s(&header.flg, 1);
{
size_t s = sizeof(header.mtime);
uint8_t *buf = malloc(s);
memcpy(buf, &header.mtime, s);
write_chunk(buf, s);
}
write_chunk_s(&header.xfl, 1);
write_chunk_s(&header.os, 1);
if (header.flg & FEXTRA) {
uint16_t xlen;
len = fread(&xlen, sizeof(xlen), 1, f);
{
uint8_t *buf = malloc(len);
memcpy(buf, &xlen, len);
write_chunk(buf, len);
}
extra_fields = malloc(xlen);
len = fread(extra_fields, 1, xlen, f);
write_chunk(extra_fields, xlen);
}
if (header.flg & FNAME) {
size_t n;
len = getdelim(&filename, &n, '\0', f);
write_chunk((uint8_t*) filename, n);
}
if (header.flg & FCOMMENT) {
size_t n;
len = getdelim(&file_comment, &n, '\0', f);
write_chunk((uint8_t*) file_comment, n);
}
if (header.flg & FHCRC) {
len = fread(&crc16, sizeof(crc16), 1, f);
{
uint8_t *buf = malloc(len);
memcpy(buf, &crc16, len);
write_chunk(buf, len);
}
}
// cleanup:
if (extra_fields) free(extra_fields);
if (filename) free(filename);
if (file_comment) free(file_comment);
flush_line();
cleanup_line();
printf("\n");
}
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