/* gzlib.c -- zlib functions common to reading and writing gzip files
 * Copyright (C) 2004, 2010 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */

#ifndef OLD_GZIO

#include "gzguts.h"

#ifdef _LARGEFILE64_SOURCE
#  define LSEEK lseek64
#else
#  define LSEEK lseek
#endif

/* Local functions */
local void gz_reset OF((gz_statep));
local gzFile gz_open OF((const char *, int, const char *, int));

#if defined UNDER_CE && defined NO_ERRNO_H
local char *strwinerror OF((DWORD error));

#  include <windows.h>

/* Map the Windows error number in ERROR to a locale-dependent error
   message string and return a pointer to it.  Typically, the values
   for ERROR come from GetLastError.

   The string pointed to shall not be modified by the application,
   but may be overwritten by a subsequent call to strwinerror

   The strwinerror function does not change the current setting
   of GetLastError.  */

local char *strwinerror (error)
     DWORD error;
{
    static char buf[1024];

    wchar_t *msgbuf;
    DWORD lasterr = GetLastError();
    DWORD chars = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM
	| FORMAT_MESSAGE_ALLOCATE_BUFFER,
	NULL,
	error,
	0, /* Default language */
	(LPVOID)&msgbuf,
	0,
	NULL);
    if (chars != 0) {
        /* If there is an \r\n appended, zap it.  */
        if (chars >= 2
            && msgbuf[chars - 2] == '\r' && msgbuf[chars - 1] == '\n') {
            chars -= 2;
            msgbuf[chars] = 0;
        }

        if (chars > sizeof (buf) - 1) {
            chars = sizeof (buf) - 1;
            msgbuf[chars] = 0;
        }

        wcstombs(buf, msgbuf, chars + 1);
        LocalFree(msgbuf);
    }
    else {
        sprintf(buf, "unknown win32 error (%ld)", error);
    }

    SetLastError(lasterr);
    return buf;
}

#endif /* UNDER_CE && NO_ERRNO_H */

/* Reset gzip file state */
local void gz_reset(state)
    gz_statep state;
{
    state->how = 0;             /* look for gzip header */
    if (state->mode == GZ_READ) {   /* for reading ... */
        state->have = 0;            /* no output data available */
        state->eof = 0;             /* not at end of file */
    }
    state->seek = 0;            /* no seek request pending */
    gz_error(state, Z_OK, NULL);   /* clear error */
    state->pos = 0;             /* no uncompressed data yet */
    state->strm.avail_in = 0;   /* no input data yet */
}

/* Open a gzip file either by name or file descriptor. */
local gzFile gz_open(path, fd, mode, use64)
    const char *path;
    int fd;
    const char *mode;
    int use64;
{
    gz_statep state;

    /* allocate gzFile structure to return */
    state = malloc(sizeof(gz_state));
    if (state == NULL)
        return NULL;
    state->size = 0;            /* no buffers allocated yet */
    state->want = GZBUFSIZE;    /* requested buffer size */
    state->msg = NULL;          /* no error message yet */

    /* interpret mode */
    state->mode = GZ_NONE;
    state->level = Z_DEFAULT_COMPRESSION;
    state->strategy = Z_DEFAULT_STRATEGY;
    while (*mode) {
        if (*mode >= '0' && *mode <= '9')
            state->level = *mode - '0';
        else
            switch (*mode) {
            case 'r':
                state->mode = GZ_READ;
                break;
#ifndef NO_GZCOMPRESS
            case 'w':
                state->mode = GZ_WRITE;
                break;
            case 'a':
                state->mode = GZ_APPEND;
                break;
#endif
            case '+':       /* can't read and write at the same time */
                free(state);
                return NULL;
            case 'b':       /* ignore -- will request binary anyway */
                break;
            case 'f':
                state->strategy = Z_FILTERED;
                break;
            case 'h':
                state->strategy = Z_HUFFMAN_ONLY;
                break;
            case 'R':
                state->strategy = Z_RLE;
                break;
            case 'F':
                state->strategy = Z_FIXED;
            default:        /* could consider as an error, but just ignore */
                ;
            }
        mode++;
    }

    /* must provide an "r", "w", or "a" */
    if (state->mode == GZ_NONE) {
        free(state);
        return NULL;
    }

    /* open the file with the appropriate mode (or just use fd) */
    state->fd = fd != -1 ? fd :
        open(path,
#ifdef O_LARGEFILE
            (use64 ? O_LARGEFILE : 0) |
#endif
#ifdef O_BINARY
            O_BINARY |
#endif
            (state->mode == GZ_READ ?
                O_RDONLY :
                (O_WRONLY | O_CREAT | (
                    state->mode == GZ_WRITE ?
                        O_TRUNC :
                        O_APPEND))),
            0666);
    if (state->fd == -1) {
        free(state);
        return NULL;
    }
    if (state->mode == GZ_APPEND)
        state->mode = GZ_WRITE;         /* simplify later checks */

    /* save the path name for error messages */
    state->path = malloc(strlen(path) + 1);
    strcpy(state->path, path);

    /* save the current position for rewinding (only if reading) */
    if (state->mode == GZ_READ) {
        state->start = LSEEK(state->fd, 0, SEEK_CUR);
        if (state->start == -1) state->start = 0;
    }

    /* initialize stream */
    gz_reset(state);

    /* return stream */
    return (gzFile)state;
}

/* -- see zlib.h -- */
gzFile ZEXPORT gzopen(path, mode)
    const char *path;
    const char *mode;
{
    return gz_open(path, -1, mode, 0);
}

/* -- see zlib.h -- */
gzFile ZEXPORT gzopen64(path, mode)
    const char *path;
    const char *mode;
{
    return gz_open(path, -1, mode, 1);
}

/* -- see zlib.h -- */
gzFile ZEXPORT gzdopen(fd, mode)
    int fd;
    const char *mode;
{
    char path[46];      /* allow up to 128-bit integers, so don't worry --
                           the sprintf() is safe */

    if (fd < 0)
        return NULL;
    sprintf(path, "<fd:%d>", fd);       /* for error messages */
    return gz_open(path, fd, mode, 1);
}

/* -- see zlib.h -- */
int ZEXPORT gzbuffer(file, size)
    gzFile file;
    unsigned size;
{
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
        return -1;

    /* make sure we haven't already allocated memory */
    if (state->size != 0)
        return -1;

    /* check and set requested size */
    if (size == 0)
        return -1;
    state->want = size;
    return 0;
}

/* -- see zlib.h -- */
int ZEXPORT gzrewind(file)
    gzFile file;
{
    gz_statep state;

    /* get internal structure */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;

    /* check that we're reading and that there's no error */
    if (state->mode != GZ_READ || state->err != Z_OK)
        return -1;

    /* back up and start over */
    if (LSEEK(state->fd, state->start, SEEK_SET) == -1)
        return -1;
    gz_reset(state);
    return 0;
}

/* -- see zlib.h -- */
z_off64_t ZEXPORT gzseek64(file, offset, whence)
    gzFile file;
    z_off64_t offset;
    int whence;
{
    unsigned n;
    z_off64_t ret;
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
        return -1;

    /* check that there's no error */
    if (state->err != Z_OK)
        return -1;

    /* can only seek from start or relative to current position */
    if (whence != SEEK_SET && whence != SEEK_CUR)
        return -1;

    /* normalize offset to a SEEK_CUR specification */
    if (whence == SEEK_SET)
        offset -= state->pos;

    /* if within raw area while reading, just go there */
    if (state->mode == GZ_READ && state->how == 1 &&
        state->pos + offset >= state->raw) {
        ret = LSEEK(state->fd, offset, SEEK_CUR);
        if (ret == -1)
            return -1;
        state->have = 0;
        state->eof = 0;
        state->seek = 0;
        gz_error(state, Z_OK, NULL);
        state->strm.avail_in = 0;
        state->pos += offset;
        return state->pos;
    }

    /* calculate skip amount, rewinding if needed for back seek when reading */
    if (offset < 0) {
        if (state->mode != GZ_READ)         /* writing -- can't go backwards */
            return -1;
        offset += state->pos;
        if (offset < 0)                     /* before start of file! */
            return -1;
        if (gzrewind(file) == -1)           /* rewind, then skip to offset */
            return -1;
    }

    /* if reading, skip what's in output buffer (one less gz_getc() check) */
    if (state->mode == GZ_READ) {
        n = state->have > offset ? (unsigned)offset : state->have;
        state->have -= n;
        state->next += n;
        state->pos += n;
        offset -= n;
    }

    /* request skip (if not zero) */
    if (offset) {
        state->seek = 1;
        state->skip = offset;
    }
    return state->pos + offset;
}

/* -- see zlib.h -- */
z_off_t ZEXPORT gzseek(file, offset, whence)
    gzFile file;
    z_off_t offset;
    int whence;
{
    z_off64_t ret;

    ret = gzseek64(file, (z_off64_t)offset, whence);
    return ret == (z_off_t)ret ? (z_off_t)ret : -1;
}

/* -- see zlib.h -- */
z_off64_t ZEXPORT gztell64(file)
    gzFile file;
{
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
        return -1;

    /* return position */
    return state->pos + (state->seek ? state->skip : 0);
}

/* -- see zlib.h -- */
z_off_t ZEXPORT gztell(file)
    gzFile file;
{
    z_off64_t ret;

    ret = gztell64(file);
    return ret == (z_off_t)ret ? (z_off_t)ret : -1;
}

/* -- see zlib.h -- */
z_off64_t ZEXPORT gzoffset64(file)
    gzFile file;
{
    z_off64_t offset;
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
        return -1;

    /* compute and return effective offset in file */
    offset = LSEEK(state->fd, 0, SEEK_CUR);
    if (offset == -1)
        return -1;
    if (state->mode == GZ_READ)             /* reading */
        offset -= state->strm.avail_in;     /* don't count buffered input */
    return offset;
}

/* -- see zlib.h -- */
z_off_t ZEXPORT gzoffset(file)
    gzFile file;
{
    z_off64_t ret;

    ret = gzoffset64(file);
    return ret == (z_off_t)ret ? (z_off_t)ret : -1;
}

/* -- see zlib.h -- */
int ZEXPORT gzeof(file)
    gzFile file;
{
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
        return -1;

    /* return end-of-file state */
    return state->mode == GZ_READ ? (state->eof && state->have == 0) : 0;
}

/* -- see zlib.h -- */
const char * ZEXPORT gzerror(file, errnum)
    gzFile file;
    int *errnum;
{
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return NULL;
    state = (gz_statep)file;
    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
        return NULL;

    /* return error information */
    *errnum = state->err;
    return state->msg == NULL ? "" : state->msg;
}

/* -- see zlib.h -- */
void ZEXPORT gzclearerr(file)
    gzFile file;
{
    gz_statep state;

    /* get internal structure and check integrity */
    if (file == NULL)
        return;
    state = (gz_statep)file;
    if (state->mode != GZ_READ && state->mode != GZ_WRITE)
        return;

    /* clear error and end-of-file */
    if (state->mode == GZ_READ)
        state->eof = 0;
    gz_error(state, Z_OK, NULL);
}

/* Create an error message in allocated memory and set state->err and
   state->msg accordingly. Free any previous error message already there.  Do
   not try to free or allocate space if the error is Z_MEM_ERROR (out of
   memory).  Simply save the error message as a static string.  If there is
   an allocation failure constructing the error message, then convert the
   error to out of memory. */
void ZEXPORT gz_error(state, err, msg)
    gz_statep state;
    int err;
    char *msg;
{
    /* free previously allocated message and clear */
    if (state->msg != NULL) {
        if (state->err != Z_MEM_ERROR)
            free(state->msg);
        state->msg = NULL;
    }

    /* set error code, and if no message, then done */
    state->err = err;
    if (msg == NULL)
        return;

    /* for an out of memory error, save as static string */
    if (err == Z_MEM_ERROR) {
        state->msg = msg;
        return;
    }

    /* construct error message with path */
    if ((state->msg = malloc(strlen(state->path) + strlen(msg) + 3)) == NULL) {
        state->err = Z_MEM_ERROR;
        state->msg = "out of memory";
        return;
    }
    strcpy(state->msg, state->path);
    strcat(state->msg, ": ");
    strcat(state->msg, msg);
    return;
}

#endif /* !OLD_GZIO */