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// example5.c - Demonstrates how to use miniz.c's low-level tdefl_compress() and tinfl_inflate() API's for simple file to file compression/decompression.
// The low-level API's are the fastest, make no use of dynamic memory allocation, and are the most flexible functions exposed by miniz.c.
// Public domain, April 11 2012, Rich Geldreich, richgel99@gmail.com. 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.
// Purposely disable a whole bunch of stuff this low-level example doesn't use.
#define MINIZ_NO_STDIO
#define MINIZ_NO_ARCHIVE_APIS
#define MINIZ_NO_TIME
#define MINIZ_NO_ZLIB_APIS
#define MINIZ_NO_MALLOC
#include "miniz.h"
// Now include stdio.h because this test uses fopen(), etc. (but we still don't want miniz.c's stdio stuff, for testing).
#include <stdio.h>
#include <limits.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))
// IN_BUF_SIZE is the size of the file read buffer.
// IN_BUF_SIZE must be >= 1
#define IN_BUF_SIZE (1024*512)
static uint8 s_inbuf[IN_BUF_SIZE];
// COMP_OUT_BUF_SIZE is the size of the output buffer used during compression.
// COMP_OUT_BUF_SIZE must be >= 1 and <= OUT_BUF_SIZE
#define COMP_OUT_BUF_SIZE (1024*512)
// OUT_BUF_SIZE is the size of the output buffer used during decompression.
// OUT_BUF_SIZE must be a power of 2 >= TINFL_LZ_DICT_SIZE (because the low-level decompressor not only writes, but reads from the output buffer as it decompresses)
//#define OUT_BUF_SIZE (TINFL_LZ_DICT_SIZE)
#define OUT_BUF_SIZE (1024*512)
static uint8 s_outbuf[OUT_BUF_SIZE];
// tdefl_compressor contains all the state needed by the low-level compressor so it's a pretty big struct (~300k).
// This example makes it a global vs. putting it on the stack, of course in real-world usage you'll probably malloc() or new it.
tdefl_compressor g_deflator;
int main(int argc, char *argv[])
{
const char *pMode;
FILE *pInfile, *pOutfile;
uint infile_size;
int level = 9;
int p = 1;
const char *pSrc_filename;
const char *pDst_filename;
const void *next_in = s_inbuf;
size_t avail_in = 0;
void *next_out = s_outbuf;
size_t avail_out = OUT_BUF_SIZE;
size_t total_in = 0, total_out = 0;
long file_loc;
assert(COMP_OUT_BUF_SIZE <= OUT_BUF_SIZE);
printf("miniz.c example5 (demonstrates tinfl/tdefl)\n");
if (argc < 4)
{
printf("File to file compression/decompression using the low-level tinfl/tdefl API's.\n");
printf("Usage: example5 [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, 0 is none.\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);
if ((pMode[0] == 'c') || (pMode[0] == 'C'))
{
// The number of dictionary probes to use at each compression level (0-10). 0=implies fastest/minimal possible probing.
static const mz_uint s_tdefl_num_probes[11] = { 0, 1, 6, 32, 16, 32, 128, 256, 512, 768, 1500 };
tdefl_status status;
uint infile_remaining = infile_size;
// create tdefl() compatible flags (we have to compose the low-level flags ourselves, or use tdefl_create_comp_flags_from_zip_params() but that means MINIZ_NO_ZLIB_APIS can't be defined).
mz_uint comp_flags = TDEFL_WRITE_ZLIB_HEADER | s_tdefl_num_probes[MZ_MIN(10, level)] | ((level <= 3) ? TDEFL_GREEDY_PARSING_FLAG : 0);
if (!level)
comp_flags |= TDEFL_FORCE_ALL_RAW_BLOCKS;
// Initialize the low-level compressor.
status = tdefl_init(&g_deflator, NULL, NULL, comp_flags);
if (status != TDEFL_STATUS_OKAY)
{
printf("tdefl_init() failed!\n");
return EXIT_FAILURE;
}
avail_out = COMP_OUT_BUF_SIZE;
// Compression.
for ( ; ; )
{
size_t in_bytes, out_bytes;
if (!avail_in)
{
// Input buffer is empty, so read more bytes from input file.
uint n = my_min(IN_BUF_SIZE, infile_remaining);
if (fread(s_inbuf, 1, n, pInfile) != n)
{
printf("Failed reading from input file!\n");
return EXIT_FAILURE;
}
next_in = s_inbuf;
avail_in = n;
infile_remaining -= n;
//printf("Input bytes remaining: %u\n", infile_remaining);
}
in_bytes = avail_in;
out_bytes = avail_out;
// Compress as much of the input as possible (or all of it) to the output buffer.
status = tdefl_compress(&g_deflator, next_in, &in_bytes, next_out, &out_bytes, infile_remaining ? TDEFL_NO_FLUSH : TDEFL_FINISH);
next_in = (const char *)next_in + in_bytes;
avail_in -= in_bytes;
total_in += in_bytes;
next_out = (char *)next_out + out_bytes;
avail_out -= out_bytes;
total_out += out_bytes;
if ((status != TDEFL_STATUS_OKAY) || (!avail_out))
{
// Output buffer is full, or compression is done or failed, so write buffer to output file.
uint n = COMP_OUT_BUF_SIZE - (uint)avail_out;
if (fwrite(s_outbuf, 1, n, pOutfile) != n)
{
printf("Failed writing to output file!\n");
return EXIT_FAILURE;
}
next_out = s_outbuf;
avail_out = COMP_OUT_BUF_SIZE;
}
if (status == TDEFL_STATUS_DONE)
{
// Compression completed successfully.
break;
}
else if (status != TDEFL_STATUS_OKAY)
{
// Compression somehow failed.
printf("tdefl_compress() failed with status %i!\n", status);
return EXIT_FAILURE;
}
}
}
else if ((pMode[0] == 'd') || (pMode[0] == 'D'))
{
// Decompression.
uint infile_remaining = infile_size;
tinfl_decompressor inflator;
tinfl_init(&inflator);
for ( ; ; )
{
size_t in_bytes, out_bytes;
tinfl_status status;
if (!avail_in)
{
// Input buffer is empty, so read more bytes from input file.
uint n = my_min(IN_BUF_SIZE, infile_remaining);
if (fread(s_inbuf, 1, n, pInfile) != n)
{
printf("Failed reading from input file!\n");
return EXIT_FAILURE;
}
next_in = s_inbuf;
avail_in = n;
infile_remaining -= n;
}
in_bytes = avail_in;
out_bytes = avail_out;
status = tinfl_decompress(&inflator, (const mz_uint8 *)next_in, &in_bytes, s_outbuf, (mz_uint8 *)next_out, &out_bytes, (infile_remaining ? TINFL_FLAG_HAS_MORE_INPUT : 0) | TINFL_FLAG_PARSE_ZLIB_HEADER);
avail_in -= in_bytes;
next_in = (const mz_uint8 *)next_in + in_bytes;
total_in += in_bytes;
avail_out -= out_bytes;
next_out = (mz_uint8 *)next_out + out_bytes;
total_out += out_bytes;
if ((status <= TINFL_STATUS_DONE) || (!avail_out))
{
// Output buffer is full, or decompression is done, so write buffer to output file.
uint n = OUT_BUF_SIZE - (uint)avail_out;
if (fwrite(s_outbuf, 1, n, pOutfile) != n)
{
printf("Failed writing to output file!\n");
return EXIT_FAILURE;
}
next_out = s_outbuf;
avail_out = OUT_BUF_SIZE;
}
// If status is <= TINFL_STATUS_DONE then either decompression is done or something went wrong.
if (status <= TINFL_STATUS_DONE)
{
if (status == TINFL_STATUS_DONE)
{
// Decompression completed successfully.
break;
}
else
{
// Decompression failed.
printf("tinfl_decompress() failed with status %i!\n", status);
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)total_in);
printf("Total output bytes: %u\n", (mz_uint32)total_out);
printf("Success.\n");
return EXIT_SUCCESS;
}