Hi all!
Who be created function for a compression of a content in cgi to the program written on C?
Share a simple example!
Has written the for gzip and deflate but does not work: (
Code:#include <stdio.h> #include <assert.h> /**/ #include <zlib.h> static void *g_zalloc_wrapper(voidpf opaque, uInt items, uInt size) { void *ptr = malloc(items * size); return ptr; } static void g_zfree_wrapper(voidpf opaque, voidpf address) { free(address); } /// gzip = 1 > gzip, gzip = 0 > deflate static int zlib_encode(Bytef *mg, int gzip) { static int gz_magic[2] = {0x1f, 0x8b}; #define OS_CODE 0x03 /*FIXME */ z_stream stream; //char *new_body; stream.next_in = mg; stream.avail_in = strlen(mg); stream.total_in = 0; //new_body = stream.next_out = malloc(strlen(mg) + 75); /* overly generous */ assert(stream.next_out); stream.avail_out = strlen(mg) + 64; stream.total_out = 0; stream.zalloc = g_zalloc_wrapper; stream.zfree = g_zfree_wrapper; stream.opaque = NULL; stream.data_type = Z_ASCII; /* */ if (deflateInit2( &stream, 3 /* compression level, 1-9, default 6 (Z_DEFAULT_COMPRESSION) */, Z_DEFLATED, ((gzip!=0)?16:0)+15 /* gzip headers? (16) + window size (15b) */, 3 /* memory level, 1-9, default 8 */, Z_DEFAULT_STRATEGY ) != Z_OK) { /* failed to initialize, bail out */ deflateEnd(&stream); return -1; } while (stream.avail_in != 0) { switch(deflate(&stream, Z_FINISH)) { case Z_STREAM_END: /* success */ break; case Z_OK: /* need more buffer space !? bail out... */ deflateEnd(&stream); return -1; default: /* other error cases */ deflateEnd(&stream); return -1; } } if(gzip!=0) { printf("Content-Encoding: gzip\n\r"); } else { printf("Content-Encoding: deflate\n\r"); } printf("Content-type: text/html\n\r\n\r"); int ifd = dup(fileno(stdout)); FILE *Out = fdopen(ifd, "w+b"); if(gzip!=0) { char *s2[10]; s2[0] = gz_magic[0]; s2[1] = gz_magic[1]; s2[2] = Z_DEFLATED; s2[3] = s2[4] = s2[5] = s2[6] = s2[7] = s2[8] = 0; s2[9] = OS_CODE; fwrite(&s2 , 10 , 1 ,Out); } fwrite(&stream.next_out , stream.total_out , 1 ,Out); if(gzip!=0) { char *trailer[9]; uLong crc = crc32(0L, Z_NULL, 0); crc = crc32(crc, (const Bytef *) mg, strlen(mg)); /* write crc & stream.total_in in LSB order */ trailer[0] = (char) crc & 0xFF; trailer[1] = (char) (crc >> 8) & 0xFF; trailer[2] = (char) (crc >> 16) & 0xFF; trailer[3] = (char) (crc >> 24) & 0xFF; trailer[4] = (char) stream.total_in & 0xFF; trailer[5] = (char) (stream.total_in >> 8) & 0xFF; trailer[6] = (char) (stream.total_in >> 16) & 0xFF; trailer[7] = (char) (stream.total_in >> 24) & 0xFF; trailer[8] = '\0'; fwrite(&trailer , 9 , 1 ,Out); } deflateEnd(&stream); } int main() { zlib_encode ("<html>test</html>", 0); }
