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#include "kexec-zlib.h"
#ifdef HAVE_LIBZ
#define _GNU_SOURCE
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <ctype.h>
#include <zlib.h>
#include "kexec.h"
char *zlib_decompress_file(const char *filename, off_t *r_size)
{
gzFile fp;
int errnum;
const char *msg;
char *buf;
off_t size, allocated;
ssize_t result;
if (!filename) {
*r_size = 0;
return 0;
}
fp = gzopen(filename, "rb");
if (fp == 0) {
msg = gzerror(fp, &errnum);
if (errnum == Z_ERRNO) {
msg = strerror(errno);
}
fprintf(stderr, "Cannot open `%s': %s\n", filename, msg);
return NULL;
}
size = 0;
allocated = 65536;
buf = xmalloc(allocated);
do {
if (size == allocated) {
allocated <<= 1;
buf = xrealloc(buf, allocated);
}
result = gzread(fp, buf + size, allocated - size);
if (result < 0) {
if ((errno == EINTR) || (errno == EAGAIN))
continue;
msg = gzerror(fp, &errnum);
if (errnum == Z_ERRNO) {
msg = strerror(errno);
}
die ("read on %s of %ld bytes failed: %s\n",
filename, (allocated - size) + 0UL, msg);
}
size += result;
} while(result > 0);
result = gzclose(fp);
if (result != Z_OK) {
msg = gzerror(fp, &errnum);
if (errnum == Z_ERRNO) {
msg = strerror(errno);
}
die ("Close of %s failed: %s\n", filename, msg);
}
*r_size = size;
return buf;
}
#else
char *zlib_decompress_file(const char *filename, off_t *r_size)
{
return NULL;
}
#endif /* HAVE_ZLIB */
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