// 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.c" | |
// 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; | |
} |