rlm@1: /* gzio.c -- IO on .gz files
rlm@1:  * Copyright (C) 1995-2002 Jean-loup Gailly.
rlm@1:  * For conditions of distribution and use, see copyright notice in zlib.h
rlm@1:  *
rlm@1:  * Compile this file with -DNO_DEFLATE to avoid the compression code.
rlm@1:  */
rlm@1: 
rlm@1: /* memgzio.c - IO on .gz files in memory
rlm@1:  * Adapted from original gzio.c from zlib library by Forgotten
rlm@1:  */
rlm@1: 
rlm@1: /* @(#) $Id: memgzio.c,v 1.5 2006/06/06 21:04:20 spacy51 Exp $ */
rlm@1: 
rlm@1: #include <stdio.h>
rlm@1: #include <stdarg.h>
rlm@1: #include <stdlib.h>
rlm@1: #include <string.h>
rlm@1: #include <errno.h>
rlm@1: 
rlm@1: #include "memgzio.h"
rlm@1: 
rlm@1: #ifndef local
rlm@1: #define local static
rlm@1: #endif
rlm@1: 
rlm@1: #ifndef DEF_MEM_LEVEL
rlm@1: #  define DEF_MEM_LEVEL 8
rlm@1: #endif
rlm@1: 
rlm@1: #ifndef OS_CODE
rlm@1: #define OS_CODE 3
rlm@1: #endif
rlm@1: 
rlm@1: #ifndef zmemcpy
rlm@1: #define zmemcpy memcpy
rlm@1: #endif
rlm@1: 
rlm@1: /*struct internal_state {int dummy;};*/ /* for buggy compilers */
rlm@1: 
rlm@1: #ifndef Z_BUFSIZE
rlm@1: #  ifdef MAXSEG_64K
rlm@1: #    define Z_BUFSIZE 4096 /* minimize memory usage for 16-bit DOS */
rlm@1: #  else
rlm@1: #    define Z_BUFSIZE 16384
rlm@1: #  endif
rlm@1: #endif
rlm@1: #ifndef Z_PRINTF_BUFSIZE
rlm@1: #  define Z_PRINTF_BUFSIZE 4096
rlm@1: #endif
rlm@1: 
rlm@1: #define ALLOC(size) malloc(size)
rlm@1: #define TRYFREE(p) \
rlm@1: 	{if (p)                            \
rlm@1: 		 free(p);}
rlm@1: 
rlm@1: static int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
rlm@1: 
rlm@1: /* gzip flag byte */
rlm@1: #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
rlm@1: #define HEAD_CRC     0x02 /* bit 1 set: header CRC present */
rlm@1: #define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
rlm@1: #define ORIG_NAME    0x08 /* bit 3 set: original file name present */
rlm@1: #define COMMENT      0x10 /* bit 4 set: file comment present */
rlm@1: #define RESERVED     0xE0 /* bits 5..7: reserved */
rlm@1: 
rlm@1: typedef struct _MemFile
rlm@1: {
rlm@1: 	char *memory;
rlm@1: 	char *next;
rlm@1: 	int   available;
rlm@1: 	int   error;
rlm@1: 	char  mode;
rlm@1: } MEMFILE;
rlm@1: 
rlm@1: typedef struct mem_stream
rlm@1: {
rlm@1: 	z_stream stream;
rlm@1: 	int      z_err;   /* error code for last stream operation */
rlm@1: 	int      z_eof;   /* set if end of input file */
rlm@1: 	MEMFILE *file;    /* memoru file */
rlm@1: 	Byte *   inbuf;   /* input buffer */
rlm@1: 	Byte *   outbuf;  /* output buffer */
rlm@1: 	uLong    crc;     /* crc32 of uncompressed data */
rlm@1: 	char *   msg;     /* error message */
rlm@1: 	int      transparent; /* 1 if input file is not a .gz file */
rlm@1: 	char     mode;    /* 'w' or 'r' */
rlm@1: 	long     startpos; /* start of compressed data in file (header skipped) */
rlm@1: } mem_stream;
rlm@1: 
rlm@1: local gzFile gz_open      OF((char *memory, const int available, const char *mode));
rlm@1: local int do_flush        OF((gzFile file, int flush));
rlm@1: local int get_byte     OF((mem_stream *s));
rlm@1: local void check_header OF((mem_stream *s));
rlm@1: local int destroy      OF((mem_stream *s));
rlm@1: local void putLong      OF((MEMFILE *file, uLong x));
rlm@1: local uLong getLong      OF((mem_stream *s));
rlm@1: 
rlm@1: local MEMFILE *memOpen(char *memory, int available, char mode)
rlm@1: {
rlm@1: 	MEMFILE *f;
rlm@1: 
rlm@1: 	if (available <= 8)
rlm@1: 		return NULL;
rlm@1: 
rlm@1: 	if (mode != 'w' && mode != 'r')
rlm@1: 		return NULL;
rlm@1: 
rlm@1: 	f = (MEMFILE *)malloc(sizeof(MEMFILE));
rlm@1: 
rlm@1: 	f->memory = memory;
rlm@1: 	f->mode   = mode;
rlm@1: 	f->error  = 0;
rlm@1: 
rlm@1: 	if (mode == 'w')
rlm@1: 	{
rlm@1: 		f->available         = available - 8;
rlm@1: 		f->next              = memory + 8;
rlm@1: 		memory[0]            = 'V';
rlm@1: 		memory[1]            = 'B';
rlm@1: 		memory[2]            = 'A';
rlm@1: 		memory[3]            = ' ';
rlm@1: 		*((int *)(memory+4)) = 0;
rlm@1: 	}
rlm@1: 	else
rlm@1: 	{
rlm@1: 		if (memory[0] != 'V' || memory[1] != 'B' || memory[2] != 'A' ||
rlm@1: 		    memory[3] != ' ')
rlm@1: 		{
rlm@1: 			free(f);
rlm@1: 			return NULL;
rlm@1: 		}
rlm@1: 		f->available = *((int *)(memory+4));
rlm@1: 		f->next      = memory+8;
rlm@1: 	}
rlm@1: 
rlm@1: 	return f;
rlm@1: }
rlm@1: 
rlm@1: local size_t memWrite(const void *buffer, size_t size, size_t count,
rlm@1:                       MEMFILE *file)
rlm@1: {
rlm@1: 	size_t total = size*count;
rlm@1: 
rlm@1: 	if (file->mode != 'w')
rlm@1: 	{
rlm@1: 		file->error = 1;
rlm@1: 		return 0;
rlm@1: 	}
rlm@1: 
rlm@1: 	if (total > (size_t)file->available)
rlm@1: 	{
rlm@1: 		total = file->available;
rlm@1: 	}
rlm@1: 	memcpy(file->next, buffer, total);
rlm@1: 	file->available -= (int)total;
rlm@1: 	file->next      += total;
rlm@1: 	return total;
rlm@1: }
rlm@1: 
rlm@1: local size_t memRead(void *buffer, size_t size, size_t count,
rlm@1:                      MEMFILE *file)
rlm@1: {
rlm@1: 	size_t total = size*count;
rlm@1: 
rlm@1: 	if (file->mode != 'r')
rlm@1: 	{
rlm@1: 		file->error = 1;
rlm@1: 		return 0;
rlm@1: 	}
rlm@1: 
rlm@1: 	if (file->available == 0)
rlm@1: 		return -1;
rlm@1: 
rlm@1: 	if (total > (size_t)file->available)
rlm@1: 	{
rlm@1: 		total = file->available;
rlm@1: 	}
rlm@1: 	memcpy(buffer, file->next, total);
rlm@1: 	file->available -= (int)total;
rlm@1: 	file->next      += total;
rlm@1: 	return total;
rlm@1: }
rlm@1: 
rlm@1: local int memPutc(int c, MEMFILE *file)
rlm@1: {
rlm@1: 	if (file->mode != 'w')
rlm@1: 	{
rlm@1: 		file->error = 1;
rlm@1: 		return -1;
rlm@1: 	}
rlm@1: 
rlm@1: 	if (file->available >= 1)
rlm@1: 	{
rlm@1: 		*file->next++ = c;
rlm@1: 		file->available--;
rlm@1: 	}
rlm@1: 	else
rlm@1: 		return -1;
rlm@1: 
rlm@1: 	return c;
rlm@1: }
rlm@1: 
rlm@1: local long memTell(MEMFILE *f)
rlm@1: {
rlm@1: 	return (long)(f->next - f->memory) - 8;
rlm@1: }
rlm@1: 
rlm@1: local int memError(MEMFILE *f)
rlm@1: {
rlm@1: 	return f->error;
rlm@1: }
rlm@1: 
rlm@1: local int memClose(MEMFILE *f)
rlm@1: {
rlm@1: 	if (f->mode == 'w')
rlm@1: 	{
rlm@1: 		*((int *)(f->memory+4)) = memTell(f);
rlm@1: 	}
rlm@1: 	free(f);
rlm@1: 	return 0;
rlm@1: }
rlm@1: 
rlm@1: local int memPrintf(MEMFILE *f, const char *format, ...)
rlm@1: {
rlm@1: 	char    buffer[80];
rlm@1: 	va_list list;
rlm@1: 	int     len;
rlm@1: 
rlm@1: 	va_start(list, format);
rlm@1: 	len = vsprintf(buffer, format, list);
rlm@1: 	va_end(list);
rlm@1: 
rlm@1: 	return (int)memWrite(buffer, 1, len, f);
rlm@1: }
rlm@1: 
rlm@1: /* ===========================================================================
rlm@1:      Opens a gzip (.gz) file for reading or writing. The mode parameter
rlm@1:    is as in fopen ("rb" or "wb"). The file is given either by file descriptor
rlm@1:    or path name (if fd == -1).
rlm@1:      gz_open return NULL if the file could not be opened or if there was
rlm@1:    insufficient memory to allocate the (de)compression state; errno
rlm@1:    can be checked to distinguish the two cases (if errno is zero, the
rlm@1:    zlib error is Z_MEM_ERROR).
rlm@1:  */
rlm@1: local gzFile gz_open(memory, available, mode)
rlm@1: char *memory;
rlm@1: const int   available;
rlm@1: const char *mode;
rlm@1: {
rlm@1: 	int         err;
rlm@1: 	int         level    = Z_DEFAULT_COMPRESSION; /* compression level */
rlm@1: 	int         strategy = Z_DEFAULT_STRATEGY; /* compression strategy */
rlm@1: 	char *      p        = (char *)mode;
rlm@1: 	mem_stream *s;
rlm@1: 	char        fmode[80]; /* copy of mode, without the compression level */
rlm@1: 	char *      m = fmode;
rlm@1: 
rlm@1: 	s = (mem_stream *)ALLOC(sizeof(mem_stream));
rlm@1: 	if (!s)
rlm@1: 		return Z_NULL;
rlm@1: 
rlm@1: 	s->stream.zalloc   = (alloc_func)0;
rlm@1: 	s->stream.zfree    = (free_func)0;
rlm@1: 	s->stream.opaque   = (voidpf)0;
rlm@1: 	s->stream.next_in  = s->inbuf = Z_NULL;
rlm@1: 	s->stream.next_out = s->outbuf = Z_NULL;
rlm@1: 	s->stream.avail_in = s->stream.avail_out = 0;
rlm@1: 	s->z_err           = Z_OK;
rlm@1: 	s->z_eof           = 0;
rlm@1: 	s->crc             = crc32(0L, Z_NULL, 0);
rlm@1: 	s->msg             = NULL;
rlm@1: 	s->transparent     = 0;
rlm@1: 	s->file            = NULL;
rlm@1: 
rlm@1: 	s->mode = '\0';
rlm@1: 	do
rlm@1: 	{
rlm@1: 		if (*p == 'r')
rlm@1: 			s->mode = 'r';
rlm@1: 		if (*p == 'w' || *p == 'a')
rlm@1: 			s->mode = 'w';
rlm@1: 		if (*p >= '0' && *p <= '9')
rlm@1: 		{
rlm@1: 			level = *p - '0';
rlm@1: 		}
rlm@1: 		else if (*p == 'f')
rlm@1: 		{
rlm@1: 			strategy = Z_FILTERED;
rlm@1: 		}
rlm@1: 		else if (*p == 'h')
rlm@1: 		{
rlm@1: 			strategy = Z_HUFFMAN_ONLY;
rlm@1: 		}
rlm@1: 		else
rlm@1: 		{
rlm@1: 			*m++ = *p; /* copy the mode */
rlm@1: 		}
rlm@1: 	}
rlm@1: 	while (*p++ && m != fmode + sizeof(fmode));
rlm@1: 	if (s->mode == '\0')
rlm@1: 		return destroy(s), (gzFile)Z_NULL;
rlm@1: 
rlm@1: 	if (s->mode == 'w')
rlm@1: 	{
rlm@1: #ifdef NO_DEFLATE
rlm@1: 		err = Z_STREAM_ERROR;
rlm@1: #else
rlm@1: 		err = deflateInit2(&(s->stream), level,
rlm@1: 		                   Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy);
rlm@1: 		/* windowBits is passed < 0 to suppress zlib header */
rlm@1: 
rlm@1: 		s->stream.next_out = s->outbuf = (Byte *)ALLOC(Z_BUFSIZE);
rlm@1: #endif
rlm@1: 		if (err != Z_OK || s->outbuf == Z_NULL)
rlm@1: 		{
rlm@1: 			return destroy(s), (gzFile)Z_NULL;
rlm@1: 		}
rlm@1: 	}
rlm@1: 	else
rlm@1: 	{
rlm@1: 		s->stream.next_in = s->inbuf = (Byte *)ALLOC(Z_BUFSIZE);
rlm@1: 
rlm@1: 		err = inflateInit2(&(s->stream), -MAX_WBITS);
rlm@1: 		/* windowBits is passed < 0 to tell that there is no zlib header.
rlm@1: 		 * Note that in this case inflate *requires* an extra "dummy" byte
rlm@1: 		 * after the compressed stream in order to complete decompression and
rlm@1: 		 * return Z_STREAM_END. Here the gzip CRC32 ensures that 4 bytes are
rlm@1: 		 * present after the compressed stream.
rlm@1: 		 */
rlm@1: 		if (err != Z_OK || s->inbuf == Z_NULL)
rlm@1: 		{
rlm@1: 			return destroy(s), (gzFile)Z_NULL;
rlm@1: 		}
rlm@1: 	}
rlm@1: 	s->stream.avail_out = Z_BUFSIZE;
rlm@1: 
rlm@1: 	errno   = 0;
rlm@1: 	s->file = memOpen(memory, available, s->mode);
rlm@1: 
rlm@1: 	if (s->file == NULL)
rlm@1: 	{
rlm@1: 		return destroy(s), (gzFile)Z_NULL;
rlm@1: 	}
rlm@1: 
rlm@1: 	if (s->mode == 'w')
rlm@1: 	{
rlm@1: 		/* Write a very simple .gz header:
rlm@1: 		 */
rlm@1: 		memPrintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1],
rlm@1: 		          Z_DEFLATED, 0 /*flags*/, 0, 0, 0, 0 /*time*/, 0 /*xflags*/, OS_CODE);
rlm@1: 		s->startpos = 10L;
rlm@1: 		/* We use 10L instead of ftell(s->file) to because ftell causes an
rlm@1: 		 * fflush on some systems. This version of the library doesn't use
rlm@1: 		 * startpos anyway in write mode, so this initialization is not
rlm@1: 		 * necessary.
rlm@1: 		 */
rlm@1: 	}
rlm@1: 	else
rlm@1: 	{
rlm@1: 		check_header(s); /* skip the .gz header */
rlm@1: 		s->startpos = (memTell(s->file) - s->stream.avail_in);
rlm@1: 	}
rlm@1: 
rlm@1: 	return (gzFile)s;
rlm@1: }
rlm@1: 
rlm@1: /* ===========================================================================
rlm@1:      Opens a gzip (.gz) file for reading or writing.
rlm@1:  */
rlm@1: gzFile ZEXPORT memgzopen(memory, available, mode)
rlm@1: char *memory;
rlm@1: int         available;
rlm@1: const char *mode;
rlm@1: {
rlm@1: 	return gz_open(memory, available, mode);
rlm@1: }
rlm@1: 
rlm@1: /* ===========================================================================
rlm@1:      Read a byte from a mem_stream; update next_in and avail_in. Return EOF
rlm@1:    for end of file.
rlm@1:    IN assertion: the stream s has been sucessfully opened for reading.
rlm@1:  */
rlm@1: local int get_byte(s)
rlm@1: mem_stream *s;
rlm@1: {
rlm@1: 	if (s->z_eof)
rlm@1: 		return EOF;
rlm@1: 	if (s->stream.avail_in == 0)
rlm@1: 	{
rlm@1: 		errno = 0;
rlm@1: 		s->stream.avail_in = (uInt)memRead(s->inbuf, 1, Z_BUFSIZE, s->file);
rlm@1: 		if (s->stream.avail_in == 0)
rlm@1: 		{
rlm@1: 			s->z_eof = 1;
rlm@1: 			if (memError(s->file))
rlm@1: 				s->z_err = Z_ERRNO;
rlm@1: 			return EOF;
rlm@1: 		}
rlm@1: 		s->stream.next_in = s->inbuf;
rlm@1: 	}
rlm@1: 	s->stream.avail_in--;
rlm@1: 	return *(s->stream.next_in)++;
rlm@1: }
rlm@1: 
rlm@1: /* ===========================================================================
rlm@1:       Check the gzip header of a mem_stream opened for reading. Set the stream
rlm@1:     mode to transparent if the gzip magic header is not present; set s->err
rlm@1:     to Z_DATA_ERROR if the magic header is present but the rest of the header
rlm@1:     is incorrect.
rlm@1:     IN assertion: the stream s has already been created sucessfully;
rlm@1:        s->stream.avail_in is zero for the first time, but may be non-zero
rlm@1:        for concatenated .gz files.
rlm@1:  */
rlm@1: local void check_header(s)
rlm@1: mem_stream *s;
rlm@1: {
rlm@1: 	int  method; /* method byte */
rlm@1: 	int  flags; /* flags byte */
rlm@1: 	uInt len;
rlm@1: 	int  c;
rlm@1: 
rlm@1: 	/* Check the gzip magic header */
rlm@1: 	for (len = 0; len < 2; len++)
rlm@1: 	{
rlm@1: 		c = get_byte(s);
rlm@1: 		if (c != gz_magic[len])
rlm@1: 		{
rlm@1: 			if (len != 0)
rlm@1: 				s->stream.avail_in++, s->stream.next_in--;
rlm@1: 			if (c != EOF)
rlm@1: 			{
rlm@1: 				s->stream.avail_in++, s->stream.next_in--;
rlm@1: 				s->transparent = 1;
rlm@1: 			}
rlm@1: 			s->z_err = s->stream.avail_in != 0 ? Z_OK : Z_STREAM_END;
rlm@1: 			return;
rlm@1: 		}
rlm@1: 	}
rlm@1: 	method = get_byte(s);
rlm@1: 	flags  = get_byte(s);
rlm@1: 	if (method != Z_DEFLATED || (flags & RESERVED) != 0)
rlm@1: 	{
rlm@1: 		s->z_err = Z_DATA_ERROR;
rlm@1: 		return;
rlm@1: 	}
rlm@1: 
rlm@1: 	/* Discard time, xflags and OS code: */
rlm@1: 	for (len = 0; len < 6; len++)
rlm@1: 		(void)get_byte(s);
rlm@1: 
rlm@1: 	if ((flags & EXTRA_FIELD) != 0)   /* skip the extra field */
rlm@1: 	{
rlm@1: 		len  =  (uInt)get_byte(s);
rlm@1: 		len += ((uInt)get_byte(s))<<8;
rlm@1: 		/* len is garbage if EOF but the loop below will quit anyway */
rlm@1: 		while (len-- != 0 && get_byte(s) != EOF)
rlm@1: 			;
rlm@1: 	}
rlm@1: 	if ((flags & ORIG_NAME) != 0)   /* skip the original file name */
rlm@1: 	{
rlm@1: 		while ((c = get_byte(s)) != 0 && c != EOF)
rlm@1: 			;
rlm@1: 	}
rlm@1: 	if ((flags & COMMENT) != 0)     /* skip the .gz file comment */
rlm@1: 	{
rlm@1: 		while ((c = get_byte(s)) != 0 && c != EOF)
rlm@1: 			;
rlm@1: 	}
rlm@1: 	if ((flags & HEAD_CRC) != 0)    /* skip the header crc */
rlm@1: 	{
rlm@1: 		for (len = 0; len < 2; len++)
rlm@1: 			(void)get_byte(s);
rlm@1: 	}
rlm@1: 	s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;
rlm@1: }
rlm@1: 
rlm@1: /* ===========================================================================
rlm@1:  * Cleanup then free the given mem_stream. Return a zlib error code.
rlm@1:    Try freeing in the reverse order of allocations.
rlm@1:  */
rlm@1: local int destroy(s)
rlm@1: mem_stream *s;
rlm@1: {
rlm@1: 	int err = Z_OK;
rlm@1: 
rlm@1: 	if (!s)
rlm@1: 		return Z_STREAM_ERROR;
rlm@1: 
rlm@1: 	TRYFREE(s->msg);
rlm@1: 
rlm@1: 	if (s->stream.state != NULL)
rlm@1: 	{
rlm@1: 		if (s->mode == 'w')
rlm@1: 		{
rlm@1: #ifdef NO_DEFLATE
rlm@1: 			err = Z_STREAM_ERROR;
rlm@1: #else
rlm@1: 			err = deflateEnd(&(s->stream));
rlm@1: #endif
rlm@1: 		}
rlm@1: 		else if (s->mode == 'r')
rlm@1: 		{
rlm@1: 			err = inflateEnd(&(s->stream));
rlm@1: 		}
rlm@1: 	}
rlm@1: 	if (s->file != NULL && memClose(s->file))
rlm@1: 	{
rlm@1: #ifdef ESPIPE
rlm@1: 		if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */
rlm@1: #endif
rlm@1: 		err = Z_ERRNO;
rlm@1: 	}
rlm@1: 	if (s->z_err < 0)
rlm@1: 		err = s->z_err;
rlm@1: 
rlm@1: 	TRYFREE(s->inbuf);
rlm@1: 	TRYFREE(s->outbuf);
rlm@1: 	TRYFREE(s);
rlm@1: 	return err;
rlm@1: }
rlm@1: 
rlm@1: /* ===========================================================================
rlm@1:      Reads the given number of uncompressed bytes from the compressed file.
rlm@1:    gzread returns the number of bytes actually read (0 for end of file).
rlm@1:  */
rlm@1: int ZEXPORT memgzread(file, buf, len)
rlm@1: gzFile file;
rlm@1: voidp    buf;
rlm@1: unsigned len;
rlm@1: {
rlm@1: 	mem_stream *s     = (mem_stream *)file;
rlm@1: 	Bytef *     start = (Bytef *)buf; /* starting point for crc computation */
rlm@1: 	Byte *      next_out; /* == stream.next_out but not forced far (for MSDOS) */
rlm@1: 
rlm@1: 	if (s == NULL || s->mode != 'r')
rlm@1: 		return Z_STREAM_ERROR;
rlm@1: 
rlm@1: 	if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO)
rlm@1: 		return -1;
rlm@1: 	if (s->z_err == Z_STREAM_END)
rlm@1: 		return 0;                            /* EOF */
rlm@1: 
rlm@1: 	next_out = (Byte *)buf;
rlm@1: 	s->stream.next_out  = (Bytef *)buf;
rlm@1: 	s->stream.avail_out = len;
rlm@1: 
rlm@1: 	while (s->stream.avail_out != 0)
rlm@1: 	{
rlm@1: 		if (s->transparent)
rlm@1: 		{
rlm@1: 			/* Copy first the lookahead bytes: */
rlm@1: 			uInt n = s->stream.avail_in;
rlm@1: 			if (n > s->stream.avail_out)
rlm@1: 				n = s->stream.avail_out;
rlm@1: 			if (n > 0)
rlm@1: 			{
rlm@1: 				zmemcpy(s->stream.next_out, s->stream.next_in, n);
rlm@1: 				next_out += n;
rlm@1: 				s->stream.next_out   = next_out;
rlm@1: 				s->stream.next_in   += n;
rlm@1: 				s->stream.avail_out -= n;
rlm@1: 				s->stream.avail_in  -= n;
rlm@1: 			}
rlm@1: 			if (s->stream.avail_out > 0)
rlm@1: 			{
rlm@1: 				s->stream.avail_out -= (uInt)memRead(next_out, 1, s->stream.avail_out, s->file);
rlm@1: 			}
rlm@1: 			len -= s->stream.avail_out;
rlm@1: 			s->stream.total_in  += (uLong)len;
rlm@1: 			s->stream.total_out += (uLong)len;
rlm@1: 			if (len == 0)
rlm@1: 				s->z_eof = 1;
rlm@1: 			return (int)len;
rlm@1: 		}
rlm@1: 		if (s->stream.avail_in == 0 && !s->z_eof)
rlm@1: 		{
rlm@1: 			errno = 0;
rlm@1: 			s->stream.avail_in = (uInt)memRead(s->inbuf, 1, Z_BUFSIZE, s->file);
rlm@1: 			if (s->stream.avail_in == 0)
rlm@1: 			{
rlm@1: 				s->z_eof = 1;
rlm@1: 				if (memError(s->file))
rlm@1: 				{
rlm@1: 					s->z_err = Z_ERRNO;
rlm@1: 					break;
rlm@1: 				}
rlm@1: 			}
rlm@1: 			s->stream.next_in = s->inbuf;
rlm@1: 		}
rlm@1: 		s->z_err = inflate(&(s->stream), Z_NO_FLUSH);
rlm@1: 
rlm@1: 		if (s->z_err == Z_STREAM_END)
rlm@1: 		{
rlm@1: 			/* Check CRC and original size */
rlm@1: 			s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
rlm@1: 			start  = s->stream.next_out;
rlm@1: 
rlm@1: 			if (getLong(s) != s->crc)
rlm@1: 			{
rlm@1: 				s->z_err = Z_DATA_ERROR;
rlm@1: 			}
rlm@1: 			else
rlm@1: 			{
rlm@1: 				(void)getLong(s);
rlm@1: 				/* The uncompressed length returned by above getlong() may
rlm@1: 				 * be different from s->stream.total_out) in case of
rlm@1: 				 * concatenated .gz files. Check for such files:
rlm@1: 				 */
rlm@1: 				check_header(s);
rlm@1: 				if (s->z_err == Z_OK)
rlm@1: 				{
rlm@1: 					uLong total_in  = s->stream.total_in;
rlm@1: 					uLong total_out = s->stream.total_out;
rlm@1: 
rlm@1: 					inflateReset(&(s->stream));
rlm@1: 					s->stream.total_in  = total_in;
rlm@1: 					s->stream.total_out = total_out;
rlm@1: 					s->crc = crc32(0L, Z_NULL, 0);
rlm@1: 				}
rlm@1: 			}
rlm@1: 		}
rlm@1: 		if (s->z_err != Z_OK || s->z_eof)
rlm@1: 			break;
rlm@1: 	}
rlm@1: 	s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
rlm@1: 
rlm@1: 	return (int)(len - s->stream.avail_out);
rlm@1: }
rlm@1: 
rlm@1: #ifndef NO_DEFLATE
rlm@1: /* ===========================================================================
rlm@1:      Writes the given number of uncompressed bytes into the compressed file.
rlm@1:    gzwrite returns the number of bytes actually written (0 in case of error).
rlm@1:  */
rlm@1: int ZEXPORT memgzwrite(file, buf, len)
rlm@1: gzFile file;
rlm@1: const voidp buf;
rlm@1: unsigned    len;
rlm@1: {
rlm@1: 	mem_stream *s = (mem_stream *)file;
rlm@1: 
rlm@1: 	if (s == NULL || s->mode != 'w')
rlm@1: 		return Z_STREAM_ERROR;
rlm@1: 
rlm@1: 	s->stream.next_in  = (Bytef *)buf;
rlm@1: 	s->stream.avail_in = len;
rlm@1: 
rlm@1: 	while (s->stream.avail_in != 0)
rlm@1: 	{
rlm@1: 		if (s->stream.avail_out == 0)
rlm@1: 		{
rlm@1: 			s->stream.next_out = s->outbuf;
rlm@1: 			if (memWrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE)
rlm@1: 			{
rlm@1: 				s->z_err = Z_ERRNO;
rlm@1: 				break;
rlm@1: 			}
rlm@1: 			s->stream.avail_out = Z_BUFSIZE;
rlm@1: 		}
rlm@1: 		s->z_err = deflate(&(s->stream), Z_NO_FLUSH);
rlm@1: 		if (s->z_err != Z_OK)
rlm@1: 			break;
rlm@1: 	}
rlm@1: 	s->crc = crc32(s->crc, (const Bytef *)buf, len);
rlm@1: 
rlm@1: 	return (int)(len - s->stream.avail_in);
rlm@1: }
rlm@1: #endif
rlm@1: /* ===========================================================================
rlm@1:      Flushes all pending output into the compressed file. The parameter
rlm@1:    flush is as in the deflate() function.
rlm@1:  */
rlm@1: local int do_flush(file, flush)
rlm@1: gzFile file;
rlm@1: int flush;
rlm@1: {
rlm@1: 	uInt        len;
rlm@1: 	int         done = 0;
rlm@1: 	mem_stream *s    = (mem_stream *)file;
rlm@1: 
rlm@1: 	if (s == NULL || s->mode != 'w')
rlm@1: 		return Z_STREAM_ERROR;
rlm@1: 
rlm@1: 	s->stream.avail_in = 0; /* should be zero already anyway */
rlm@1: 
rlm@1: 	for (;;)
rlm@1: 	{
rlm@1: 		len = Z_BUFSIZE - s->stream.avail_out;
rlm@1: 
rlm@1: 		if (len != 0)
rlm@1: 		{
rlm@1: 			if ((uInt)memWrite(s->outbuf, 1, len, s->file) != len)
rlm@1: 			{
rlm@1: 				s->z_err = Z_ERRNO;
rlm@1: 				return Z_ERRNO;
rlm@1: 			}
rlm@1: 			s->stream.next_out  = s->outbuf;
rlm@1: 			s->stream.avail_out = Z_BUFSIZE;
rlm@1: 		}
rlm@1: 		if (done)
rlm@1: 			break;
rlm@1: 		s->z_err = deflate(&(s->stream), flush);
rlm@1: 
rlm@1: 		/* Ignore the second of two consecutive flushes: */
rlm@1: 		if (len == 0 && s->z_err == Z_BUF_ERROR)
rlm@1: 			s->z_err = Z_OK;
rlm@1: 
rlm@1: 		/* deflate has finished flushing only when it hasn't used up
rlm@1: 		 * all the available space in the output buffer:
rlm@1: 		 */
rlm@1: 		done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);
rlm@1: 
rlm@1: 		if (s->z_err != Z_OK && s->z_err != Z_STREAM_END)
rlm@1: 			break;
rlm@1: 	}
rlm@1: 	return s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
rlm@1: }
rlm@1: 
rlm@1: /* ===========================================================================
rlm@1:    Outputs a long in LSB order to the given file
rlm@1:  */
rlm@1: local void putLong(file, x)
rlm@1: MEMFILE *file;
rlm@1: uLong x;
rlm@1: {
rlm@1: 	int n;
rlm@1: 	for (n = 0; n < 4; n++)
rlm@1: 	{
rlm@1: 		memPutc((int)(x & 0xff), file);
rlm@1: 		x >>= 8;
rlm@1: 	}
rlm@1: }
rlm@1: 
rlm@1: /* ===========================================================================
rlm@1:    Reads a long in LSB order from the given mem_stream. Sets z_err in case
rlm@1:    of error.
rlm@1:  */
rlm@1: local uLong getLong(s)
rlm@1: mem_stream *s;
rlm@1: {
rlm@1: 	uLong x = (uLong)get_byte(s);
rlm@1: 	int   c;
rlm@1: 
rlm@1: 	x += ((uLong)get_byte(s))<<8;
rlm@1: 	x += ((uLong)get_byte(s))<<16;
rlm@1: 	c  = get_byte(s);
rlm@1: 	if (c == EOF)
rlm@1: 		s->z_err = Z_DATA_ERROR;
rlm@1: 	x += ((uLong)c)<<24;
rlm@1: 	return x;
rlm@1: }
rlm@1: 
rlm@1: /* ===========================================================================
rlm@1:      Flushes all pending output if necessary, closes the compressed file
rlm@1:    and deallocates all the (de)compression state.
rlm@1:  */
rlm@1: int ZEXPORT memgzclose(file)
rlm@1: gzFile file;
rlm@1: {
rlm@1: 	int         err;
rlm@1: 	mem_stream *s = (mem_stream *)file;
rlm@1: 
rlm@1: 	if (s == NULL)
rlm@1: 		return Z_STREAM_ERROR;
rlm@1: 
rlm@1: 	if (s->mode == 'w')
rlm@1: 	{
rlm@1: #ifdef NO_DEFLATE
rlm@1: 		return Z_STREAM_ERROR;
rlm@1: #else
rlm@1: 		err = do_flush(file, Z_FINISH);
rlm@1: 		if (err != Z_OK)
rlm@1: 			return destroy((mem_stream *)file);
rlm@1: 
rlm@1: 		putLong(s->file, s->crc);
rlm@1: 		putLong(s->file, s->stream.total_in);
rlm@1: #endif
rlm@1: 	}
rlm@1: 	return destroy((mem_stream *)file);
rlm@1: }
rlm@1: 
rlm@1: long ZEXPORT memtell(file)
rlm@1: gzFile file;
rlm@1: {
rlm@1: 	mem_stream *s = (mem_stream *)file;
rlm@1: 
rlm@1: 	if (s == NULL)
rlm@1: 		return Z_STREAM_ERROR;
rlm@1: 
rlm@1: 	return memTell(s->file);
rlm@1: }