// example3.c - Demonstrates how to use miniz.c's deflate() and inflate() functions for simple file compression.
// Public domain, May 15 2011, Rich Geldreich,
[email protected]. See "unlicense" statement at the end of tinfl.c.
// For simplicity, this example is limited to files smaller than 4GB, but this is not a limitation of miniz.c.
#include <stdio.h>
#include <limits.h>
#include "miniz.h"
typedef unsigned char uint8;
typedef unsigned short uint16;
typedef unsigned int uint;
#define my_max(a,b) (((a) > (b)) ? (a) : (b))
#define my_min(a,b) (((a) < (b)) ? (a) : (b))
#define BUF_SIZE (1024 * 1024)
static uint8 s_inbuf[BUF_SIZE];
static uint8 s_outbuf[BUF_SIZE];
int main(int argc, char *argv[])
{
const char *pMode;
FILE *pInfile, *pOutfile;
uint infile_size;
int level = Z_BEST_COMPRESSION;
z_stream stream;
int p = 1;
const char *pSrc_filename;
const char *pDst_filename;
long file_loc;
printf("miniz.c version: %s\n", MZ_VERSION);
if (argc < 4)
{
printf("Usage: example3 [options] [mode:c or d] infile outfile\n");
printf("\nModes:\n");
printf("c - Compresses file infile to a zlib stream in file outfile\n");
printf("d - Decompress zlib stream in file infile to file outfile\n");
printf("\nOptions:\n");
printf("-l[0-10] - Compression level, higher values are slower.\n");
return EXIT_FAILURE;
}
while ((p < argc) && (argv[p][0] == '-'))
{
switch (argv[p][1])
{
case 'l':
{
level = atoi(&argv[1][2]);
if ((level < 0) || (level > 10))
{
printf("Invalid level!\n");
return EXIT_FAILURE;
}
break;
}
default:
{
printf("Invalid option: %s\n", argv[p]);
return EXIT_FAILURE;
}
}
p++;
}
if ((argc - p) < 3)
{
printf("Must specify mode, input filename, and output filename after options!\n");
return EXIT_FAILURE;
}
else if ((argc - p) > 3)
{
printf("Too many filenames!\n");
return EXIT_FAILURE;
}
pMode = argv[p++];
if (!strchr("cCdD", pMode[0]))
{
printf("Invalid mode!\n");
return EXIT_FAILURE;
}
pSrc_filename = argv[p++];
pDst_filename = argv[p++];
printf("Mode: %c, Level: %u\nInput File: \"%s\"\nOutput File: \"%s\"\n", pMode[0], level, pSrc_filename, pDst_filename);
// Open input file.
pInfile = fopen(pSrc_filename, "rb");
if (!pInfile)
{
printf("Failed opening input file!\n");
return EXIT_FAILURE;
}
// Determine input file's size.
fseek(pInfile, 0, SEEK_END);
file_loc = ftell(pInfile);
fseek(pInfile, 0, SEEK_SET);
if ((file_loc < 0) || (file_loc > INT_MAX))
{
// This is not a limitation of miniz or tinfl, but this example.
printf("File is too large to be processed by this example.\n");
return EXIT_FAILURE;
}
infile_size = (uint)file_loc;
// Open output file.
pOutfile = fopen(pDst_filename, "wb");
if (!pOutfile)
{
printf("Failed opening output file!\n");
return EXIT_FAILURE;
}
printf("Input file size: %u\n", infile_size);
// Init the z_stream
memset(&stream, 0, sizeof(stream));
stream.next_in = s_inbuf;
stream.avail_in = 0;
stream.next_out = s_outbuf;
stream.avail_out = BUF_SIZE;
if ((pMode[0] == 'c') || (pMode[0] == 'C'))
{
// Compression.
uint infile_remaining = infile_size;
if (deflateInit(&stream, level) != Z_OK)
{
printf("deflateInit() failed!\n");
return EXIT_FAILURE;
}
for ( ; ; )
{
int status;
if (!stream.avail_in)
{
// Input buffer is empty, so read more bytes from input file.
uint n = my_min(BUF_SIZE, infile_remaining);
if (fread(s_inbuf, 1, n, pInfile) != n)
{
printf("Failed reading from input file!\n");
return EXIT_FAILURE;
}
stream.next_in = s_inbuf;
stream.avail_in = n;
infile_remaining -= n;
//printf("Input bytes remaining: %u\n", infile_remaining);
}
status = deflate(&stream, infile_remaining ? Z_NO_FLUSH : Z_FINISH);
if ((status == Z_STREAM_END) || (!stream.avail_out))
{
// Output buffer is full, or compression is done, so write buffer to output file.
uint n = BUF_SIZE - stream.avail_out;
if (fwrite(s_outbuf, 1, n, pOutfile) != n)
{
printf("Failed writing to output file!\n");
return EXIT_FAILURE;
}
stream.next_out = s_outbuf;
stream.avail_out = BUF_SIZE;
}
if (status == Z_STREAM_END)
break;
else if (status != Z_OK)
{
printf("deflate() failed with status %i!\n", status);
return EXIT_FAILURE;
}
}
if (deflateEnd(&stream) != Z_OK)
{
printf("deflateEnd() failed!\n");
return EXIT_FAILURE;
}
}
else if ((pMode[0] == 'd') || (pMode[0] == 'D'))
{
// Decompression.
uint infile_remaining = infile_size;
if (inflateInit(&stream))
{
printf("inflateInit() failed!\n");
return EXIT_FAILURE;
}
for ( ; ; )
{
int status;
if (!stream.avail_in)
{
// Input buffer is empty, so read more bytes from input file.
uint n = my_min(BUF_SIZE, infile_remaining);
if (fread(s_inbuf, 1, n, pInfile) != n)
{
printf("Failed reading from input file!\n");
return EXIT_FAILURE;
}
stream.next_in = s_inbuf;
stream.avail_in = n;
infile_remaining -= n;
}
status = inflate(&stream, Z_SYNC_FLUSH);
if ((status == Z_STREAM_END) || (!stream.avail_out))
{
// Output buffer is full, or decompression is done, so write buffer to output file.
uint n = BUF_SIZE - stream.avail_out;
if (fwrite(s_outbuf, 1, n, pOutfile) != n)
{
printf("Failed writing to output file!\n");
return EXIT_FAILURE;
}
stream.next_out = s_outbuf;
stream.avail_out = BUF_SIZE;
}
if (status == Z_STREAM_END)
break;
else if (status != Z_OK)
{
printf("inflate() failed with status %i!\n", status);
return EXIT_FAILURE;
}
}
if (inflateEnd(&stream) != Z_OK)
{
printf("inflateEnd() failed!\n");
return EXIT_FAILURE;
}
}
else
{
printf("Invalid mode!\n");
return EXIT_FAILURE;
}
fclose(pInfile);
if (EOF == fclose(pOutfile))
{
printf("Failed writing to output file!\n");
return EXIT_FAILURE;
}
printf("Total input bytes: %u\n", (mz_uint32)stream.total_in);
printf("Total output bytes: %u\n", (mz_uint32)stream.total_out);
printf("Success.\n");
return EXIT_SUCCESS;
}
