From 9811b53dd9e8f67015c7199fff12b5bfc6965330 Mon Sep 17 00:00:00 2001 From: Mark Adler Date: Fri, 9 Sep 2011 23:24:24 -0700 Subject: zlib 1.2.2.1 --- inflate.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 68 insertions(+), 7 deletions(-) (limited to 'inflate.c') diff --git a/inflate.c b/inflate.c index c6d3826..cca1d3b 100644 --- a/inflate.c +++ b/inflate.c @@ -1,5 +1,5 @@ /* inflate.c -- zlib decompression - * Copyright (C) 1995-2003 Mark Adler + * Copyright (C) 1995-2004 Mark Adler * For conditions of distribution and use, see copyright notice in zlib.h */ @@ -113,6 +113,7 @@ z_streamp strm; state->mode = HEAD; state->last = 0; state->havedict = 0; + state->head = Z_NULL; state->wsize = 0; state->whave = 0; state->hold = 0; @@ -582,6 +583,8 @@ int flush; break; } state->flags = 0; /* expect zlib header */ + if (state->head != Z_NULL) + state->head->done = -1; if (!(state->wrap & 1) || /* check if zlib header allowed */ #else if ( @@ -621,16 +624,24 @@ int flush; state->mode = BAD; break; } + if (state->head != Z_NULL) + state->head->text = (int)((hold >> 8) & 1); if (state->flags & 0x0200) CRC2(state->check, hold); INITBITS(); state->mode = TIME; case TIME: NEEDBITS(32); + if (state->head != Z_NULL) + state->head->time = hold; if (state->flags & 0x0200) CRC4(state->check, hold); INITBITS(); state->mode = OS; case OS: NEEDBITS(16); + if (state->head != Z_NULL) { + state->head->xflags = (int)(hold & 0xff); + state->head->os = (int)(hold >> 8); + } if (state->flags & 0x0200) CRC2(state->check, hold); INITBITS(); state->mode = EXLEN; @@ -638,15 +649,26 @@ int flush; if (state->flags & 0x0400) { NEEDBITS(16); state->length = (unsigned)(hold); + if (state->head != Z_NULL) + state->head->extra_len = (unsigned)hold; if (state->flags & 0x0200) CRC2(state->check, hold); INITBITS(); } + else if (state->head != Z_NULL) + state->head->extra = Z_NULL; state->mode = EXTRA; case EXTRA: if (state->flags & 0x0400) { copy = state->length; if (copy > have) copy = have; if (copy) { + if (state->head != Z_NULL && + state->head->extra != Z_NULL) { + len = state->head->extra_len - state->length; + zmemcpy(state->head->extra + len, next, + len + copy > state->head->extra_max ? + state->head->extra_max - len : copy); + } if (state->flags & 0x0200) state->check = crc32(state->check, next, copy); have -= copy; @@ -655,6 +677,7 @@ int flush; } if (state->length) goto inf_leave; } + state->length = 0; state->mode = NAME; case NAME: if (state->flags & 0x0800) { @@ -662,13 +685,20 @@ int flush; copy = 0; do { len = (unsigned)(next[copy++]); + if (state->head != Z_NULL && + state->head->name != Z_NULL && + state->length < state->head->name_max) + state->head->name[state->length++] = len; } while (len && copy < have); - if (state->flags & 0x02000) + if (state->flags & 0x0200) state->check = crc32(state->check, next, copy); have -= copy; next += copy; if (len) goto inf_leave; } + else if (state->head != Z_NULL) + state->head->name = Z_NULL; + state->length = 0; state->mode = COMMENT; case COMMENT: if (state->flags & 0x1000) { @@ -676,13 +706,19 @@ int flush; copy = 0; do { len = (unsigned)(next[copy++]); + if (state->head != Z_NULL && + state->head->comment != Z_NULL && + state->length < state->head->comm_max) + state->head->comment[state->length++] = len; } while (len && copy < have); - if (state->flags & 0x02000) + if (state->flags & 0x0200) state->check = crc32(state->check, next, copy); have -= copy; next += copy; if (len) goto inf_leave; } + else if (state->head != Z_NULL) + state->head->comment = Z_NULL; state->mode = HCRC; case HCRC: if (state->flags & 0x0200) { @@ -694,6 +730,10 @@ int flush; } INITBITS(); } + if (state->head != Z_NULL) { + state->head->hcrc = (int)((state->flags >> 9) & 1); + state->head->done = 1; + } strm->adler = state->check = crc32(0L, Z_NULL, 0); state->mode = TYPE; break; @@ -1110,12 +1150,16 @@ uInt dictLength; /* check state */ if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; state = (struct inflate_state FAR *)strm->state; - if (state->mode != DICT) return Z_STREAM_ERROR; + if (state->wrap != 0 && state->mode != DICT) + return Z_STREAM_ERROR; /* check for correct dictionary id */ - id = adler32(0L, Z_NULL, 0); - id = adler32(id, dictionary, dictLength); - if (id != state->check) return Z_DATA_ERROR; + if (state->mode == DICT) { + id = adler32(0L, Z_NULL, 0); + id = adler32(id, dictionary, dictLength); + if (id != state->check) + return Z_DATA_ERROR; + } /* copy dictionary to window */ if (updatewindow(strm, strm->avail_out)) { @@ -1137,6 +1181,23 @@ uInt dictLength; return Z_OK; } +int ZEXPORT inflateGetHeader(strm, head) +z_streamp strm; +gz_headerp head; +{ + struct inflate_state FAR *state; + + /* check state */ + if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR; + state = (struct inflate_state FAR *)strm->state; + if ((state->wrap & 2) == 0) return Z_STREAM_ERROR; + + /* save header structure */ + state->head = head; + head->done = 0; + return Z_OK; +} + /* Search buf[0..len-1] for the pattern: 0, 0, 0xff, 0xff. Return when found or when out of input. When called, *have is the number of pattern bytes -- cgit v1.2.3-55-g6feb