112     gzFile gz;  in gz_open()  local
117     gz = malloc(sizeof(struct gzFile_s));  in gz_open()
118     if (gz == NULL)  in gz_open()
120     gz->write = strchr(mode, 'w') != NULL;  in gz_open()
121     gz->strm.zalloc = myalloc;  in gz_open()
122     gz->strm.zfree = myfree;  in gz_open()
123     gz->strm.opaque = NULL;  in gz_open()
124     gz->buf = malloc(gz->write ? BUFLENW : BUFLEN);  in gz_open()
126     if (gz->buf == NULL) {  in gz_open()
127         free(gz);  in gz_open()
138     if (gz->write)  in gz_open()
139         ret = deflateInit2(&(gz->strm), level, 8, 15 + 16, 8, 0);  in gz_open()
141         gz->strm.next_in = NULL;  in gz_open()
142         gz->strm.avail_in = 0;  in gz_open()
143         ret = inflateInit2(&(gz->strm), 15 + 16);  in gz_open()
146         free(gz);  in gz_open()
149     gz->file = path == NULL ? fdopen(fd, gz->write ? "wb" : "rb") :  in gz_open()
150                               fopen(path, gz->write ? "wb" : "rb");  in gz_open()
151     if (gz->file == NULL) {  in gz_open()
152         gz->write ? deflateEnd(&(gz->strm)) : inflateEnd(&(gz->strm));  in gz_open()
153         free(gz);  in gz_open()
156     gz->err = 0;  in gz_open()
157     gz->msg = "";  in gz_open()
158     return gz;  in gz_open()
163 int gzwrite(gzFile gz, const void *buf, unsigned len)  in gzwrite()  argument
167     if (gz == NULL || !gz->write)  in gzwrite()
169     strm = &(gz->strm);  in gzwrite()
173         strm->next_out = gz->buf;  in gzwrite()
176         fwrite(gz->buf, 1, BUFLENW - strm->avail_out, gz->file);  in gzwrite()
183 int gzread(gzFile gz, void *buf, unsigned len)  in gzread()  argument
187     if (gz == NULL || gz->write || gz->err)  in gzread()
189     strm = &(gz->strm);  in gzread()
195             strm->next_in = gz->buf;  in gzread()
196             strm->avail_in = (uint32_t)fread(gz->buf, 1, BUFLEN, gz->file);  in gzread()
202                 gz->err = ret;  in gzread()
203                 gz->msg = strm->msg;  in gzread()
217 int gzclose(gzFile gz)  in gzclose()  argument
221     if (gz == NULL)  in gzclose()
223     strm = &(gz->strm);  in gzclose()
224     if (gz->write) {  in gzclose()
228             strm->next_out = gz->buf;  in gzclose()
231             fwrite(gz->buf, 1, BUFLENW - strm->avail_out, gz->file);  in gzclose()
237     free(gz->buf);  in gzclose()
238     fclose(gz->file);  in gzclose()
239     free(gz);  in gzclose()
245 const char *gzerror(gzFile gz, int *err)  in gzerror()  argument
247     *err = gz->err;  in gzerror()
248     return gz->msg;  in gzerror()