Jonathon Fletcher / Mbed 2 deprecated MBEDZlib

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependencies:   mbed-rtos mbed

main.cpp@0:54f5be781526, 2012-10-21 (annotated)

Committer:
jonathonfletcher
Date:
Sun Oct 21 07:46:41 2012 +0000
Revision:
0:54f5be781526
initial checkin

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jonathonfletcher 0:54f5be781526 1 #include "mbed.h"
jonathonfletcher 0:54f5be781526 2 #include "rtos.h"
jonathonfletcher 0:54f5be781526 3
jonathonfletcher 0:54f5be781526 4 #include "zlib.h"
jonathonfletcher 0:54f5be781526 5
jonathonfletcher 0:54f5be781526 6
jonathonfletcher 0:54f5be781526 7 static const char *newline = "\r\n";
jonathonfletcher 0:54f5be781526 8
jonathonfletcher 0:54f5be781526 9
jonathonfletcher 0:54f5be781526 10 BusOut leds(LED1, LED2, LED3, LED4);
jonathonfletcher 0:54f5be781526 11 LocalFileSystem fs("local");
jonathonfletcher 0:54f5be781526 12
jonathonfletcher 0:54f5be781526 13
jonathonfletcher 0:54f5be781526 14
jonathonfletcher 0:54f5be781526 15 /** GUNZIP a from src buffer to dst buffer
jonathonfletcher 0:54f5be781526 16 @param dst : destination buffer
jonathonfletcher 0:54f5be781526 17 @param dst_length : pointer to destination buffer length
jonathonfletcher 0:54f5be781526 18 @param src : source buffer
jonathonfletcher 0:54f5be781526 19 @param src_length : source buffer length
jonathonfletcher 0:54f5be781526 20 @return Z_OK on success, zlib error (<0) on failure
jonathonfletcher 0:54f5be781526 21 */
jonathonfletcher 0:54f5be781526 22 int gunzip(unsigned char *dst, unsigned long *dst_length, unsigned char *src, unsigned long src_length)
jonathonfletcher 0:54f5be781526 23 {
jonathonfletcher 0:54f5be781526 24 z_stream stream;
jonathonfletcher 0:54f5be781526 25 memset(&stream, 0, sizeof(stream));
jonathonfletcher 0:54f5be781526 26
jonathonfletcher 0:54f5be781526 27 stream.next_in = src;
jonathonfletcher 0:54f5be781526 28 stream.avail_in = src_length;
jonathonfletcher 0:54f5be781526 29
jonathonfletcher 0:54f5be781526 30 stream.next_out = dst;
jonathonfletcher 0:54f5be781526 31 stream.avail_out = *dst_length;
jonathonfletcher 0:54f5be781526 32
jonathonfletcher 0:54f5be781526 33 int rv = inflateInit2(&stream, 15 + 16);
jonathonfletcher 0:54f5be781526 34 if (Z_OK == rv) {
jonathonfletcher 0:54f5be781526 35 rv = inflate(&stream, Z_NO_FLUSH);
jonathonfletcher 0:54f5be781526 36 if (Z_STREAM_END == rv) {
jonathonfletcher 0:54f5be781526 37 inflateEnd(&stream);
jonathonfletcher 0:54f5be781526 38 rv = Z_OK;
jonathonfletcher 0:54f5be781526 39 }
jonathonfletcher 0:54f5be781526 40 }
jonathonfletcher 0:54f5be781526 41
jonathonfletcher 0:54f5be781526 42 if (Z_OK == rv) {
jonathonfletcher 0:54f5be781526 43 *dst_length = stream.total_out;
jonathonfletcher 0:54f5be781526 44 } else {
jonathonfletcher 0:54f5be781526 45 *dst_length = 0;
jonathonfletcher 0:54f5be781526 46 }
jonathonfletcher 0:54f5be781526 47
jonathonfletcher 0:54f5be781526 48 return rv;
jonathonfletcher 0:54f5be781526 49 }
jonathonfletcher 0:54f5be781526 50
jonathonfletcher 0:54f5be781526 51 /** GUNZIP a from src buffer to dst buffer
jonathonfletcher 0:54f5be781526 52 @param dst : destination buffer
jonathonfletcher 0:54f5be781526 53 @param dst_length : pointer to destination buffer length
jonathonfletcher 0:54f5be781526 54 @param src : source buffer
jonathonfletcher 0:54f5be781526 55 @param src_length : source buffer length
jonathonfletcher 0:54f5be781526 56 @return Z_OK on success, zlib error (<0) on failure
jonathonfletcher 0:54f5be781526 57 */
jonathonfletcher 0:54f5be781526 58 int gzip(unsigned char *dst, unsigned long *dst_length, unsigned char *src, unsigned long src_length)
jonathonfletcher 0:54f5be781526 59 {
jonathonfletcher 0:54f5be781526 60 z_stream stream;
jonathonfletcher 0:54f5be781526 61 memset(&stream, 0, sizeof(stream));
jonathonfletcher 0:54f5be781526 62
jonathonfletcher 0:54f5be781526 63 stream.next_in = src;
jonathonfletcher 0:54f5be781526 64 stream.avail_in = src_length;
jonathonfletcher 0:54f5be781526 65
jonathonfletcher 0:54f5be781526 66 stream.next_out = Z_NULL;
jonathonfletcher 0:54f5be781526 67 stream.avail_out = 0;
jonathonfletcher 0:54f5be781526 68
jonathonfletcher 0:54f5be781526 69 /* add 16 to MAX_WBITS to specify gzip format - it gets taken off again in defaultInit2 */
jonathonfletcher 0:54f5be781526 70 int rv = deflateInit2(&stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 16 + MAX_WBITS, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
jonathonfletcher 0:54f5be781526 71 if (Z_OK == rv) {
jonathonfletcher 0:54f5be781526 72 unsigned long dst_bound = deflateBound(&stream, stream.avail_in) + 12; /* 12 bytes for the gzip header */
jonathonfletcher 0:54f5be781526 73 if (dst_bound > *dst_length) {
jonathonfletcher 0:54f5be781526 74 rv = Z_MEM_ERROR;
jonathonfletcher 0:54f5be781526 75 } else {
jonathonfletcher 0:54f5be781526 76 stream.next_out = dst;
jonathonfletcher 0:54f5be781526 77 stream.avail_out = dst_bound;
jonathonfletcher 0:54f5be781526 78 }
jonathonfletcher 0:54f5be781526 79 }
jonathonfletcher 0:54f5be781526 80
jonathonfletcher 0:54f5be781526 81 if (Z_OK == rv) {
jonathonfletcher 0:54f5be781526 82 gz_header header;
jonathonfletcher 0:54f5be781526 83 memset(&header, 0, sizeof(header));
jonathonfletcher 0:54f5be781526 84 rv = deflateSetHeader(&stream, &header);
jonathonfletcher 0:54f5be781526 85 }
jonathonfletcher 0:54f5be781526 86
jonathonfletcher 0:54f5be781526 87 if (Z_OK == rv) {
jonathonfletcher 0:54f5be781526 88 rv = deflate(&stream, Z_FINISH);
jonathonfletcher 0:54f5be781526 89 if (Z_STREAM_END == rv) {
jonathonfletcher 0:54f5be781526 90 rv = deflateEnd(&stream);
jonathonfletcher 0:54f5be781526 91 }
jonathonfletcher 0:54f5be781526 92 }
jonathonfletcher 0:54f5be781526 93
jonathonfletcher 0:54f5be781526 94 if (Z_OK == rv) {
jonathonfletcher 0:54f5be781526 95 *dst_length = stream.total_out;
jonathonfletcher 0:54f5be781526 96 } else {
jonathonfletcher 0:54f5be781526 97 *dst_length = 0;
jonathonfletcher 0:54f5be781526 98 }
jonathonfletcher 0:54f5be781526 99
jonathonfletcher 0:54f5be781526 100 return rv;
jonathonfletcher 0:54f5be781526 101 }
jonathonfletcher 0:54f5be781526 102
jonathonfletcher 0:54f5be781526 103
jonathonfletcher 0:54f5be781526 104 int main(int argc, char**argv)
jonathonfletcher 0:54f5be781526 105 {
jonathonfletcher 0:54f5be781526 106
jonathonfletcher 0:54f5be781526 107 unsigned char input_data[2048];
jonathonfletcher 0:54f5be781526 108 unsigned long input_data_length = 0;
jonathonfletcher 0:54f5be781526 109 FILE *ifp = fopen("/local/src.txt", "r");
jonathonfletcher 0:54f5be781526 110 if (ifp) {
jonathonfletcher 0:54f5be781526 111 int br = fread(input_data, 1, sizeof(input_data), ifp);
jonathonfletcher 0:54f5be781526 112 fclose(ifp);
jonathonfletcher 0:54f5be781526 113 input_data_length = br;
jonathonfletcher 0:54f5be781526 114 }
jonathonfletcher 0:54f5be781526 115 printf("%s:%d: input_data_length:%lu%s", __FILE__, __LINE__, input_data_length, newline);
jonathonfletcher 0:54f5be781526 116
jonathonfletcher 0:54f5be781526 117
jonathonfletcher 0:54f5be781526 118 unsigned char gzip_data[2048];
jonathonfletcher 0:54f5be781526 119 unsigned long gzip_data_length = 0;
jonathonfletcher 0:54f5be781526 120 if (input_data_length > 0) {
jonathonfletcher 0:54f5be781526 121 gzip_data_length = sizeof(gzip_data);
jonathonfletcher 0:54f5be781526 122 int rv = gzip(gzip_data, &gzip_data_length, input_data, input_data_length);
jonathonfletcher 0:54f5be781526 123 if (Z_OK == rv) {
jonathonfletcher 0:54f5be781526 124 FILE *ofp = fopen("/local/dst.gz", "w");
jonathonfletcher 0:54f5be781526 125 if (ofp) {
jonathonfletcher 0:54f5be781526 126 int bw = fwrite(gzip_data, 1, gzip_data_length, ofp);
jonathonfletcher 0:54f5be781526 127 fclose(ofp);
jonathonfletcher 0:54f5be781526 128 }
jonathonfletcher 0:54f5be781526 129 } else {
jonathonfletcher 0:54f5be781526 130 printf("%s:%d: %d%s", __FILE__, __LINE__, rv, newline);
jonathonfletcher 0:54f5be781526 131 }
jonathonfletcher 0:54f5be781526 132 }
jonathonfletcher 0:54f5be781526 133 printf("%s:%d: gzip_data_length:%lu%s", __FILE__, __LINE__, gzip_data_length, newline);
jonathonfletcher 0:54f5be781526 134
jonathonfletcher 0:54f5be781526 135
jonathonfletcher 0:54f5be781526 136 unsigned char output_data[2048];
jonathonfletcher 0:54f5be781526 137 unsigned long output_data_length = 0;
jonathonfletcher 0:54f5be781526 138 if (gzip_data_length > 0) {
jonathonfletcher 0:54f5be781526 139 output_data_length = sizeof(output_data);
jonathonfletcher 0:54f5be781526 140 int rv = gunzip(output_data, &output_data_length, gzip_data, gzip_data_length);
jonathonfletcher 0:54f5be781526 141 if (Z_OK != rv) {
jonathonfletcher 0:54f5be781526 142 printf("%s:%d: %d%s", __FILE__, __LINE__, rv, newline);
jonathonfletcher 0:54f5be781526 143 }
jonathonfletcher 0:54f5be781526 144 }
jonathonfletcher 0:54f5be781526 145 printf("%s:%d: output_data_length:%lu%s", __FILE__, __LINE__, output_data_length, newline);
jonathonfletcher 0:54f5be781526 146
jonathonfletcher 0:54f5be781526 147
jonathonfletcher 0:54f5be781526 148 if (input_data_length > 0 and input_data_length > 0) {
jonathonfletcher 0:54f5be781526 149 bool input_matches_output = false;
jonathonfletcher 0:54f5be781526 150 if (input_data_length == output_data_length) {
jonathonfletcher 0:54f5be781526 151 input_matches_output = true;
jonathonfletcher 0:54f5be781526 152 for ( size_t i = 0 ; input_matches_output && i < input_data_length ; i++ ) {
jonathonfletcher 0:54f5be781526 153 if (input_data[i] != output_data[i]) {
jonathonfletcher 0:54f5be781526 154 input_matches_output = false;
jonathonfletcher 0:54f5be781526 155 }
jonathonfletcher 0:54f5be781526 156 }
jonathonfletcher 0:54f5be781526 157 }
jonathonfletcher 0:54f5be781526 158 printf("%s:%d: input (%lu bytes) %s output (%lu bytes)%s", __FILE__, __LINE__, input_data_length, input_matches_output?"matches":"does not match", output_data_length, newline);
jonathonfletcher 0:54f5be781526 159 } else {
jonathonfletcher 0:54f5be781526 160 printf("%s:%d: input and/or output length is 0%s", __FILE__, __LINE__, newline);
jonathonfletcher 0:54f5be781526 161 }
jonathonfletcher 0:54f5be781526 162
jonathonfletcher 0:54f5be781526 163 while (true) {
jonathonfletcher 0:54f5be781526 164 leds = (leds ^ 1);
jonathonfletcher 0:54f5be781526 165 Thread::wait(1000);
jonathonfletcher 0:54f5be781526 166 }
jonathonfletcher 0:54f5be781526 167 }