Doug Anson / zlib

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gunzip.cpp@3:ed54c8225fe6, 2017-02-28 (annotated)

Committer:
ansond
Date:
Tue Feb 28 16:50:16 2017 +0000
Revision:
3:ed54c8225fe6
Parent:
gunzip.c@1:2a3edb8df037 
updated

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ansond 1:2a3edb8df037 1 #include "mbed.h"
ansond 1:2a3edb8df037 2 #include "zlib.h"
ansond 1:2a3edb8df037 3
ansond 1:2a3edb8df037 4 /** GUNZIP a from src buffer to dst buffer
ansond 1:2a3edb8df037 5 @param dst : destination buffer
ansond 1:2a3edb8df037 6 @param dst_length : pointer to destination buffer length
ansond 1:2a3edb8df037 7 @param src : source buffer
ansond 1:2a3edb8df037 8 @param src_length : source buffer length
ansond 1:2a3edb8df037 9 @return Z_OK on success, zlib error (<0) on failure
ansond 1:2a3edb8df037 10 */
ansond 3:ed54c8225fe6 11 extern "C" int gunzip(unsigned char *dst, unsigned long *dst_length, unsigned char *src, unsigned long src_length)
ansond 1:2a3edb8df037 12 {
ansond 1:2a3edb8df037 13 z_stream stream;
ansond 1:2a3edb8df037 14 memset(&stream, 0, sizeof(stream));
ansond 1:2a3edb8df037 15
ansond 1:2a3edb8df037 16 stream.next_in = src;
ansond 1:2a3edb8df037 17 stream.avail_in = src_length;
ansond 1:2a3edb8df037 18
ansond 1:2a3edb8df037 19 stream.next_out = dst;
ansond 1:2a3edb8df037 20 stream.avail_out = *dst_length;
ansond 1:2a3edb8df037 21
ansond 1:2a3edb8df037 22 int rv = inflateInit2(&stream, 15 + 16);
ansond 1:2a3edb8df037 23 if (Z_OK == rv) {
ansond 1:2a3edb8df037 24 rv = inflate(&stream, Z_NO_FLUSH);
ansond 1:2a3edb8df037 25 if (Z_STREAM_END == rv) {
ansond 1:2a3edb8df037 26 inflateEnd(&stream);
ansond 1:2a3edb8df037 27 rv = Z_OK;
ansond 1:2a3edb8df037 28 }
ansond 1:2a3edb8df037 29 }
ansond 1:2a3edb8df037 30
ansond 1:2a3edb8df037 31 if (Z_OK == rv) {
ansond 1:2a3edb8df037 32 *dst_length = stream.total_out;
ansond 1:2a3edb8df037 33 } else {
ansond 1:2a3edb8df037 34 *dst_length = 0;
ansond 1:2a3edb8df037 35 }
ansond 1:2a3edb8df037 36
ansond 1:2a3edb8df037 37 return rv;
ansond 1:2a3edb8df037 38 }