Annotation of libwww/Library/src/HTZip.c, revision 2.4
2.1 frystyk 1: /*
2: ** ZIP ENCODING / DECODING MODULE
3: **
4: ** (c) COPYRIGHT MIT 1995.
5: ** Please first read the full copyright statement in the file COPYRIGH.
2.4 ! frystyk 6: ** @(#) $Id: HTZip.c,v 2.3 1997/01/29 19:22:22 frystyk Exp $
2.1 frystyk 7: **
8: ** This module requires zlib in order to compile/link
9: */
10:
11: /* Library include files */
12: #include "sysdep.h"
13: #include "WWWUtil.h"
14: #include "WWWCore.h"
15: #include "HTZip.h" /* Implemented here */
16:
2.3 frystyk 17: #ifdef WWW_MSWINDOWS
18: #define ZLIB_DLL
19: #endif
20:
2.1 frystyk 21: #include "zlib.h"
22:
23: #define OUTBUF_SIZE 8192
24:
25: struct _HTStream {
26: const HTStreamClass * isa;
27: int state;
28: HTRequest * request;
29: HTStream * target; /* Our output target */
30: z_stream * zstream; /* Zlib stream */
31: char outbuf [OUTBUF_SIZE]; /* Inflated data */
32: };
33:
34: PRIVATE int CompressionLevel = Z_DEFAULT_COMPRESSION;
35:
36: /* ------------------------------------------------------------------------- */
37:
38: PRIVATE BOOL Zlib_init (HTStream * me, int level)
39: {
40: if (me && me->zstream &&
41: (level == Z_DEFAULT_COMPRESSION ||
42: (level >= Z_BEST_SPEED && level <= Z_BEST_COMPRESSION))) {
43: int status;
2.4 ! frystyk 44: if (STREAM_TRACE)
! 45: HTTrace("Zlib Inflate Init stream %p with compression level %d\n", me, level);
2.1 frystyk 46: if ((status = inflateInit(me->zstream)) != Z_OK) {
2.4 ! frystyk 47: if (STREAM_TRACE) HTTrace("Zlib........ Failed with status %d\n", status);
2.1 frystyk 48: return NO;
49: }
50: return YES;
51: }
52: return NO;
53: }
54:
55: PRIVATE BOOL ZLib_terminate (HTStream * me)
56: {
2.4 ! frystyk 57: if (STREAM_TRACE) HTTrace("Zlib Inflate Terminating stream %p\n", me);
2.1 frystyk 58: if (me) {
59: int status;
60: if (STREAM_TRACE)
2.4 ! frystyk 61: HTTrace("Results..... Inflated incoming data: deflated %lu, inflated %lu, factor %.2f\n",
! 62: me->zstream->total_in, me->zstream->total_out,
! 63: me->zstream->total_in == 0 ? 0.0 :
! 64: (double) me->zstream->total_out / me->zstream->total_in);
2.1 frystyk 65: if ((status = inflateEnd(me->zstream)) != Z_OK) {
2.4 ! frystyk 66: if (STREAM_TRACE) HTTrace("Zlib........ Failed with status %d\n", status);
2.1 frystyk 67: return NO;
68: }
69: return YES;
70: }
71: return NO;
72: }
73:
74: PRIVATE int HTZLibInflate_flush (HTStream * me)
75: {
76: return (*me->target->isa->flush)(me->target);
77: }
78:
79: PRIVATE int HTZLibInflate_free (HTStream * me)
80: {
81: int status = HT_OK;
82: ZLib_terminate(me);
83: if ((status = (*me->target->isa->_free)(me->target)) == HT_WOULD_BLOCK)
84: return HT_WOULD_BLOCK;
2.4 ! frystyk 85: if (STREAM_TRACE) HTTrace("Zlib Inflate FREEING...\n");
2.1 frystyk 86: HT_FREE(me->zstream);
87: HT_FREE(me);
88: return status;
89: }
90:
91: PRIVATE int HTZLibInflate_abort (HTStream * me, HTList * e)
92: {
2.4 ! frystyk 93: if (STREAM_TRACE) HTTrace("Zlib Inflate ABORTING...\n");
2.1 frystyk 94: ZLib_terminate(me);
95: (*me->target->isa->abort)(me->target, NULL);
96: HT_FREE(me->zstream);
97: HT_FREE(me);
98: return HT_ERROR;
99: }
100:
101: PRIVATE int HTZLibInflate_write (HTStream * me, const char * buf, int len)
102: {
103: if (me->state != HT_OK) {
104: me->state = (*me->target->isa->put_block)(me->target,
105: me->outbuf,
106: OUTBUF_SIZE - me->zstream->avail_out);
107: if (me->state != HT_OK) return me->state;
108: }
109:
110: /*
111: ** Setup the zstream buffers to handle the new data
112: */
113: me->zstream->next_in = (unsigned char *) buf;
114: me->zstream->avail_in = len;
115: me->zstream->next_out = (unsigned char *) me->outbuf;
116: me->zstream->avail_out = OUTBUF_SIZE;
117:
118: /*
119: ** Now run through the data and inflate it. We use Z_PARTIAL_FLUSH
120: ** in order to put as much data in the output buffer as quick as
121: ** possible.
122: */
123: for (;;) {
124: int status = inflate(me->zstream, Z_PARTIAL_FLUSH);
125: switch (status) {
126: case Z_OK:
127: me->state = (*me->target->isa->put_block)(me->target,
128: me->outbuf,
129: OUTBUF_SIZE - me->zstream->avail_out);
130: if (me->state != HT_OK) return me->state;
131:
132: /*
133: ** All data was consumed and we are ready to handle the
134: ** next data.
135: */
136: me->zstream->next_out = (unsigned char *) me->outbuf;
137: me->zstream->avail_out = OUTBUF_SIZE;
138: break;
139:
140: case Z_MEM_ERROR:
141: HT_OUTOFMEM("HTZLibInflate_write");
142: return HT_ERROR;
143:
144: case Z_BUF_ERROR:
145: /*
146: ** No action was taken anf we can take this as a sign ot it
147: ** having finished all data in the input buffer.
148: */
149: return HT_OK;
150:
151: default:
2.4 ! frystyk 152: if (STREAM_TRACE) HTTrace("Zlib Inflate Inflate returned %d\n", status);
2.1 frystyk 153: return HT_ERROR;
154: }
155: }
156: return HT_OK;
157: }
158:
159: PRIVATE int HTZLibInflate_put_character (HTStream * me, char c)
160: {
161: return HTZLibInflate_write(me, &c, 1);
162: }
163:
164: PRIVATE int HTZLibInflate_put_string (HTStream * me, const char * s)
165: {
166: return HTZLibInflate_write(me, s, (int) strlen(s));
167: }
168:
169: PRIVATE const HTStreamClass HTInflate =
170: {
171: "ZlibInflate",
172: HTZLibInflate_flush,
173: HTZLibInflate_free,
174: HTZLibInflate_abort,
175: HTZLibInflate_put_character,
176: HTZLibInflate_put_string,
177: HTZLibInflate_write
178: };
179:
180: PUBLIC BOOL HTZLib_setCompressionLevel (int level)
181: {
182: if (level >= Z_BEST_SPEED && level <= Z_BEST_COMPRESSION) {
183: CompressionLevel = level;
2.4 ! frystyk 184: if (STREAM_TRACE) HTTrace("Zlib........ Compression level set to %d\n", level);
2.1 frystyk 185: }
186: return NO;
187: }
188:
189: PUBLIC int HTZLib_compressionLevel (void)
190: {
191: return CompressionLevel;
192: }
193:
194: PUBLIC HTStream * HTZLib_inflate (HTRequest * request,
195: void * param,
196: HTEncoding coding,
197: HTStream * target)
198: {
199: HTStream * me = NULL;
200: if ((me = (HTStream *) HT_CALLOC(1, sizeof(HTStream))) == NULL ||
201: (me->zstream = (z_stream *) HT_CALLOC(1, sizeof(z_stream))) == NULL)
202: HT_OUTOFMEM("HTZLib_inflate");
203: me->isa = &HTInflate;
204: me->state = HT_OK;
205: me->request = request;
206: me->target = target ? target : HTErrorStream();
207: if (Zlib_init(me, CompressionLevel) != YES) {
208: HT_FREE(me);
209: return HTErrorStream();
210: }
2.4 ! frystyk 211: if (STREAM_TRACE) HTTrace("Zlib Inflate Stream created\n");
2.1 frystyk 212: return me;
213: }
Webmaster
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to HTZip.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Public] / libwww / Library / src