78 lines
1.8 KiB
C++
78 lines
1.8 KiB
C++
|
/*
|
||
|
|
To build the snappytool binary:
|
||
|
|
g++ main.cpp /usr/lib/libsnappy.a -o snappytool
|
||
|
|
or, if you have built the C++ snappy library from source:
|
||
|
|
g++ main.cpp /path/to/your/snappy/.libs/libsnappy.a -o snappytool
|
||
|
|
after running "make" from your snappy checkout directory.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <errno.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#include "snappy.h"
|
||
|
|
|
||
|
|
#define N 1000000
|
||
|
|
|
||
|
|
char dst[N];
|
||
|
|
char src[N];
|
||
|
|
|
||
|
|
int main(int argc, char** argv) {
|
||
|
|
// Parse args.
|
||
|
|
if (argc != 2) {
|
||
|
|
fprintf(stderr, "exactly one of -d or -e must be given\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
bool decode = strcmp(argv[1], "-d") == 0;
|
||
|
|
bool encode = strcmp(argv[1], "-e") == 0;
|
||
|
|
if (decode == encode) {
|
||
|
|
fprintf(stderr, "exactly one of -d or -e must be given\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Read all of stdin into src[:s].
|
||
|
|
size_t s = 0;
|
||
|
|
while (1) {
|
||
|
|
if (s == N) {
|
||
|
|
fprintf(stderr, "input too large\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
ssize_t n = read(0, src+s, N-s);
|
||
|
|
if (n == 0) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (n < 0) {
|
||
|
|
fprintf(stderr, "read error: %s\n", strerror(errno));
|
||
|
|
// TODO: handle EAGAIN, EINTR?
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
s += n;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Encode or decode src[:s] to dst[:d], and write to stdout.
|
||
|
|
size_t d = 0;
|
||
|
|
if (encode) {
|
||
|
|
if (N < snappy::MaxCompressedLength(s)) {
|
||
|
|
fprintf(stderr, "input too large after encoding\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
snappy::RawCompress(src, s, dst, &d);
|
||
|
|
} else {
|
||
|
|
if (!snappy::GetUncompressedLength(src, s, &d)) {
|
||
|
|
fprintf(stderr, "could not get uncompressed length\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
if (N < d) {
|
||
|
|
fprintf(stderr, "input too large after decoding\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
if (!snappy::RawUncompress(src, s, dst)) {
|
||
|
|
fprintf(stderr, "input was not valid Snappy-compressed data\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
write(1, dst, d);
|
||
|
|
return 0;
|
||
|
|
}
|