328 lines
10 KiB
C
Executable File
328 lines
10 KiB
C
Executable File
// 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;
|
|
}
|