Annotation of libwww/Library/src/HTZip.c, revision 2.3
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.
2.3 ! frystyk 6: ** @(#) $Id: HTZip.c,v 2.2 1997/01/27 20:54:42 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 (STREAM_TRACE) HTTrace("ZLib........ Initializing stream %p\n", me);
41: if (me && me->zstream &&
42: (level == Z_DEFAULT_COMPRESSION ||
43: (level >= Z_BEST_SPEED && level <= Z_BEST_COMPRESSION))) {
44: int status;
45: if (STREAM_TRACE) HTTrace("ZLib init... Compression level %d\n", level);
46: if ((status = inflateInit(me->zstream)) != Z_OK) {
47: if (STREAM_TRACE) HTTrace("ZLib........ Failed with status %d\n", status);
48: return NO;
49: }
50: return YES;
51: }
52: return NO;
53: }
54:
55: PRIVATE BOOL ZLib_terminate (HTStream * me)
56: {
57: if (STREAM_TRACE) HTTrace("ZLib........ Terminating stream %p\n", me);
58: if (me) {
59: int status;
60: if (STREAM_TRACE)
61: HTTrace("Results..... Compress incoming: raw data %lu, compressed %lu, factor %.2f\n",
62: me->zstream->total_out, me->zstream->total_in,
63: me->zstream->total_out == 0 ? 0.0 :
64: (double) me->zstream->total_in / me->zstream->total_out);
65: if ((status = inflateEnd(me->zstream)) != Z_OK) {
66: if (STREAM_TRACE) HTTrace("ZLib........ Failed with status %d\n", status);
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;
85: if (STREAM_TRACE) HTTrace("Inflate..... FREEING...\n");
86: HT_FREE(me->zstream);
87: HT_FREE(me);
88: return status;
89: }
90:
91: PRIVATE int HTZLibInflate_abort (HTStream * me, HTList * e)
92: {
93: if (STREAM_TRACE) HTTrace("Inflate..... ABORTING...\n");
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:
152: if (STREAM_TRACE) HTTrace("Inflate..... Inflate returned %d\n", status);
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;
184: if (STREAM_TRACE) HTTrace("zlib........ Compression level set to %d\n", level);
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: }
211: if (STREAM_TRACE) HTTrace("zlib Inflate Stream created\n");
212: return me;
213: }
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