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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;
+}