/* gzwrite.c -- zlib functions for writing gzip files

 * Copyright (C) 2004-2019 Mark Adler

 * For conditions of distribution and use, see copyright notice in zlib.h

 */

#include "gzguts.h"

/* Local functions */

local int gz_init OF((gz_statep));

local int gz_comp OF((gz_statep, int));

local int gz_zero OF((gz_statep, z_off64_t));

local z_size_t gz_write OF((gz_statep, voidpc, z_size_t));

/* Initialize state for writing a gzip file.  Mark initialization by setting

   state->size to non-zero.  Return -1 on a memory allocation failure, or 0 on

   success. */

local int gz_init(state)

    gz_statep state;

{

    int ret;

    z_streamp strm = &(state->strm);

    /* allocate input buffer (double size for gzprintf) */

    state->in = (unsigned char *)malloc(state->want << 1);

    if (state->in == NULL) {

        gz_error(state, Z_MEM_ERROR, "out of memory");

        return -1;

    }

    /* only need output buffer and deflate state if compressing */

    if (!state->direct) {

        /* allocate output buffer */

        state->out = (unsigned char *)malloc(state->want);

        if (state->out == NULL) {

            free(state->in);

            gz_error(state, Z_MEM_ERROR, "out of memory");

            return -1;

        }

        /* allocate deflate memory, set up for gzip compression */

        strm->zalloc = Z_NULL;

        strm->zfree = Z_NULL;

        strm->opaque = Z_NULL;

        ret = deflateInit2(strm, state->level, Z_DEFLATED,

                           MAX_WBITS + 16, DEF_MEM_LEVEL, state->strategy);

        if (ret != Z_OK) {

            free(state->out);

            free(state->in);

            gz_error(state, Z_MEM_ERROR, "out of memory");

            return -1;

        }

        strm->next_in = NULL;

    }

    /* mark state as initialized */

    state->size = state->want;

    /* initialize write buffer if compressing */

    if (!state->direct) {

        strm->avail_out = state->size;

        strm->next_out = state->out;

        state->x.next = strm->next_out;

    }

    return 0;

}

/* Compress whatever is at avail_in and next_in and write to the output file.

   Return -1 if there is an error writing to the output file or if gz_init()

   fails to allocate memory, otherwise 0.  flush is assumed to be a valid

   deflate() flush value.  If flush is Z_FINISH, then the deflate() state is

   reset to start a new gzip stream.  If gz->direct is true, then simply write

   to the output file without compressing, and ignore flush. */

local int gz_comp(state, flush)

    gz_statep state;

    int flush;

{

    int ret, writ;

    unsigned have, put, max = ((unsigned)-1 >> 2) + 1;

    z_streamp strm = &(state->strm);

    /* allocate memory if this is the first time through */

    if (state->size == 0 && gz_init(state) == -1)

        return -1;

    /* write directly if requested */

    if (state->direct) {

        while (strm->avail_in) {

            put = strm->avail_in > max ? max : strm->avail_in;

            writ = write(state->fd, strm->next_in, put);

            if (writ < 0) {

                gz_error(state, Z_ERRNO, zstrerror());

                return -1;

            }

            strm->avail_in -= (unsigned)writ;

            strm->next_in += writ;

        }

        return 0;

    }

    /* check for a pending reset */

    if (state->reset) {

        /* don't start a new gzip member unless there is data to write */

        if (strm->avail_in == 0)

            return 0;

        deflateReset(strm);

        state->reset = 0;

    }

    /* run deflate() on provided input until it produces no more output */

    ret = Z_OK;

    do {

        /* write out current buffer contents if full, or if flushing, but if

           doing Z_FINISH then don't write until we get to Z_STREAM_END */

        if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&

            (flush != Z_FINISH || ret == Z_STREAM_END))) {

            while (strm->next_out > state->x.next) {

                put = strm->next_out - state->x.next > (int)max ? max :

                      (unsigned)(strm->next_out - state->x.next);

                writ = write(state->fd, state->x.next, put);

                if (writ < 0) {

                    gz_error(state, Z_ERRNO, zstrerror());

                    return -1;

                }

                state->x.next += writ;

            }

            if (strm->avail_out == 0) {

                strm->avail_out = state->size;

                strm->next_out = state->out;

                state->x.next = state->out;

            }

        }

        /* compress */

        have = strm->avail_out;

        ret = deflate(strm, flush);

        if (ret == Z_STREAM_ERROR) {

            gz_error(state, Z_STREAM_ERROR,

                      "internal error: deflate stream corrupt");

            return -1;

        }

        have -= strm->avail_out;

    } while (have);

    /* if that completed a deflate stream, allow another to start */

    if (flush == Z_FINISH)

        state->reset = 1;

    /* all done, no errors */

    return 0;

}

/* Compress len zeros to output.  Return -1 on a write error or memory

   allocation failure by gz_comp(), or 0 on success. */

local int gz_zero(state, len)

    gz_statep state;

    z_off64_t len;

{

    int first;

    unsigned n;

    z_streamp strm = &(state->strm);

    /* consume whatever's left in the input buffer */

    if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)

        return -1;

    /* compress len zeros (len guaranteed > 0) */

    first = 1;

    while (len) {

        n = GT_OFF(state->size) || (z_off64_t)state->size > len ?

            (unsigned)len : state->size;

        if (first) {

            memset(state->in, 0, n);

            first = 0;

        }

        strm->avail_in = n;

        strm->next_in = state->in;

        state->x.pos += n;

        if (gz_comp(state, Z_NO_FLUSH) == -1)

            return -1;

        len -= n;

    }

    return 0;

}

/* Write len bytes from buf to file.  Return the number of bytes written.  If

   the returned value is less than len, then there was an error. */

local z_size_t gz_write(state, buf, len)

    gz_statep state;

    voidpc buf;

    z_size_t len;

{

    z_size_t put = len;

    /* if len is zero, avoid unnecessary operations */

    if (len == 0)

        return 0;

    /* allocate memory if this is the first time through */

    if (state->size == 0 && gz_init(state) == -1)

        return 0;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            return 0;

    }

    /* for small len, copy to input buffer, otherwise compress directly */

    if (len < state->size) {

        /* copy to input buffer, compress when full */

        do {

            unsigned have, copy;

            if (state->strm.avail_in == 0)

                state->strm.next_in = state->in;

            have = (unsigned)((state->strm.next_in + state->strm.avail_in) -

                              state->in);

            copy = state->size - have;

            if (copy > len)

                copy = (unsigned)len;

            memcpy(state->in + have, buf, copy);

            state->strm.avail_in += copy;

            state->x.pos += copy;

            buf = (const char *)buf + copy;

            len -= copy;

            if (len && gz_comp(state, Z_NO_FLUSH) == -1)

                return 0;

        } while (len);

    }

    else {

        /* consume whatever's left in the input buffer */

        if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)

            return 0;

        /* directly compress user buffer to file */

        state->strm.next_in = (z_const Bytef *)buf;

        do {

            unsigned n = (unsigned)-1;

            if (n > len)

                n = (unsigned)len;

            state->strm.avail_in = n;

            state->x.pos += n;

            if (gz_comp(state, Z_NO_FLUSH) == -1)

                return 0;

            len -= n;

        } while (len);

    }

    /* input was all buffered or compressed */

    return put;

}

/* -- see zlib.h -- */

int ZEXPORT gzwrite(file, buf, len)

    gzFile file;

    voidpc buf;

    unsigned len;

{

    gz_statep state;

    /* get internal structure */

    if (file == NULL)

        return 0;

    state = (gz_statep)file;

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return 0;

    /* since an int is returned, make sure len fits in one, otherwise return

       with an error (this avoids a flaw in the interface) */

    if ((int)len < 0) {

        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");

        return 0;

    }

    /* write len bytes from buf (the return value will fit in an int) */

    return (int)gz_write(state, buf, len);

}

/* -- see zlib.h -- */

z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)

    voidpc buf;

    z_size_t size;

    z_size_t nitems;

    gzFile file;

{

    z_size_t len;

    gz_statep state;

    /* get internal structure */

    if (file == NULL)

        return 0;

    state = (gz_statep)file;

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return 0;

    /* compute bytes to read -- error on overflow */

    len = nitems * size;

    if (size && len / size != nitems) {

        gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");

        return 0;

    }

    /* write len bytes to buf, return the number of full items written */

    return len ? gz_write(state, buf, len) / size : 0;

}

/* -- see zlib.h -- */

int ZEXPORT gzputc(file, c)

    gzFile file;

    int c;

{

    unsigned have;

    unsigned char buf[1];

    gz_statep state;

    z_streamp strm;

    /* get internal structure */

    if (file == NULL)

        return -1;

    state = (gz_statep)file;

    strm = &(state->strm);

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return -1;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            return -1;

    }

    /* try writing to input buffer for speed (state->size == 0 if buffer not

       initialized) */

    if (state->size) {

        if (strm->avail_in == 0)

            strm->next_in = state->in;

        have = (unsigned)((strm->next_in + strm->avail_in) - state->in);

        if (have < state->size) {

            state->in[have] = (unsigned char)c;

            strm->avail_in++;

            state->x.pos++;

            return c & 0xff;

        }

    }

    /* no room in buffer or not initialized, use gz_write() */

    buf[0] = (unsigned char)c;

    if (gz_write(state, buf, 1) != 1)

        return -1;

    return c & 0xff;

}

/* -- see zlib.h -- */

int ZEXPORT gzputs(file, s)

    gzFile file;

    const char *s;

{

    z_size_t len, put;

    gz_statep state;

    /* get internal structure */

    if (file == NULL)

        return -1;

    state = (gz_statep)file;

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return -1;

    /* write string */

    len = strlen(s);

    if ((int)len < 0 || (unsigned)len != len) {

        gz_error(state, Z_STREAM_ERROR, "string length does not fit in int");

        return -1;

    }

    put = gz_write(state, s, len);

    return put < len ? -1 : (int)len;

}

#if defined(STDC) || defined(Z_HAVE_STDARG_H)

#include <stdarg.h>

/* -- see zlib.h -- */

int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)

{

    int len;

    unsigned left;

    char *next;

    gz_statep state;

    z_streamp strm;

    /* get internal structure */

    if (file == NULL)

        return Z_STREAM_ERROR;

    state = (gz_statep)file;

    strm = &(state->strm);

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return Z_STREAM_ERROR;

    /* make sure we have some buffer space */

    if (state->size == 0 && gz_init(state) == -1)

        return state->err;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            return state->err;

    }

    /* do the printf() into the input buffer, put length in len -- the input

       buffer is double-sized just for this function, so there is guaranteed to

       be state->size bytes available after the current contents */

    if (strm->avail_in == 0)

        strm->next_in = state->in;

    next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);

    next[state->size - 1] = 0;

#ifdef NO_vsnprintf

#  ifdef HAS_vsprintf_void

    (void)vsprintf(next, format, va);

    for (len = 0; len < state->size; len++)

        if (next[len] == 0) break;

#  else

    len = vsprintf(next, format, va);

#  endif

#else

#  ifdef HAS_vsnprintf_void

    (void)vsnprintf(next, state->size, format, va);

    len = strlen(next);

#  else

    len = vsnprintf(next, state->size, format, va);

#  endif

#endif

    /* check that printf() results fit in buffer */

    if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)

        return 0;

    /* update buffer and position, compress first half if past that */

    strm->avail_in += (unsigned)len;

    state->x.pos += len;

    if (strm->avail_in >= state->size) {

        left = strm->avail_in - state->size;

        strm->avail_in = state->size;

        if (gz_comp(state, Z_NO_FLUSH) == -1)

            return state->err;

        memmove(state->in, state->in + state->size, left);

        strm->next_in = state->in;

        strm->avail_in = left;

    }

    return len;

}

int ZEXPORTVA gzprintf(gzFile file, const char *format, ...)

{

    va_list va;

    int ret;

    va_start(va, format);

    ret = gzvprintf(file, format, va);

    va_end(va);

    return ret;

}

#else /* !STDC && !Z_HAVE_STDARG_H */

/* -- see zlib.h -- */

int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,

                       a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)

    gzFile file;

    const char *format;

    int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,

        a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;

{

    unsigned len, left;

    char *next;

    gz_statep state;

    z_streamp strm;

    /* get internal structure */

    if (file == NULL)

        return Z_STREAM_ERROR;

    state = (gz_statep)file;

    strm = &(state->strm);

    /* check that can really pass pointer in ints */

    if (sizeof(int) != sizeof(void *))

        return Z_STREAM_ERROR;

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return Z_STREAM_ERROR;

    /* make sure we have some buffer space */

    if (state->size == 0 && gz_init(state) == -1)

        return state->error;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            return state->error;

    }

    /* do the printf() into the input buffer, put length in len -- the input

       buffer is double-sized just for this function, so there is guaranteed to

       be state->size bytes available after the current contents */

    if (strm->avail_in == 0)

        strm->next_in = state->in;

    next = (char *)(strm->next_in + strm->avail_in);

    next[state->size - 1] = 0;

#ifdef NO_snprintf

#  ifdef HAS_sprintf_void

    sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,

            a13, a14, a15, a16, a17, a18, a19, a20);

    for (len = 0; len < size; len++)

        if (next[len] == 0)

            break;

#  else

    len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,

                  a12, a13, a14, a15, a16, a17, a18, a19, a20);

#  endif

#else

#  ifdef HAS_snprintf_void

    snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,

             a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);

    len = strlen(next);

#  else

    len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,

                   a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);

#  endif

#endif

    /* check that printf() results fit in buffer */

    if (len == 0 || len >= state->size || next[state->size - 1] != 0)

        return 0;

    /* update buffer and position, compress first half if past that */

    strm->avail_in += len;

    state->x.pos += len;

    if (strm->avail_in >= state->size) {

        left = strm->avail_in - state->size;

        strm->avail_in = state->size;

        if (gz_comp(state, Z_NO_FLUSH) == -1)

            return state->err;

        memmove(state->in, state->in + state->size, left);

        strm->next_in = state->in;

        strm->avail_in = left;

    }

    return (int)len;

}

#endif

/* -- see zlib.h -- */

int ZEXPORT gzflush(file, flush)

    gzFile file;

    int flush;

{

    gz_statep state;

    /* get internal structure */

    if (file == NULL)

        return Z_STREAM_ERROR;

    state = (gz_statep)file;

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return Z_STREAM_ERROR;

    /* check flush parameter */

    if (flush < 0 || flush > Z_FINISH)

        return Z_STREAM_ERROR;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            return state->err;

    }

    /* compress remaining data with requested flush */

    (void)gz_comp(state, flush);

    return state->err;

}

/* -- see zlib.h -- */

int ZEXPORT gzsetparams(file, level, strategy)

    gzFile file;

    int level;

    int strategy;

{

    gz_statep state;

    z_streamp strm;

    /* get internal structure */

    if (file == NULL)

        return Z_STREAM_ERROR;

    state = (gz_statep)file;

    strm = &(state->strm);

    /* check that we're writing and that there's no error */

    if (state->mode != GZ_WRITE || state->err != Z_OK)

        return Z_STREAM_ERROR;

    /* if no change is requested, then do nothing */

    if (level == state->level && strategy == state->strategy)

        return Z_OK;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            return state->err;

    }

    /* change compression parameters for subsequent input */

    if (state->size) {

        /* flush previous input with previous parameters before changing */

        if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)

            return state->err;

        deflateParams(strm, level, strategy);

    }

    state->level = level;

    state->strategy = strategy;

    return Z_OK;

}

/* -- see zlib.h -- */

int ZEXPORT gzclose_w(file)

    gzFile file;

{

    int ret = Z_OK;

    gz_statep state;

    /* get internal structure */

    if (file == NULL)

        return Z_STREAM_ERROR;

    state = (gz_statep)file;

    /* check that we're writing */

    if (state->mode != GZ_WRITE)

        return Z_STREAM_ERROR;

    /* check for seek request */

    if (state->seek) {

        state->seek = 0;

        if (gz_zero(state, state->skip) == -1)

            ret = state->err;

    }

    /* flush, free memory, and close file */

    if (gz_comp(state, Z_FINISH) == -1)

        ret = state->err;

    if (state->size) {

        if (!state->direct) {

            (void)deflateEnd(&(state->strm));

            free(state->out);

        }

        free(state->in);

    }

    gz_error(state, Z_OK, NULL);

    free(state->path);

    if (close(state->fd) == -1)

        ret = Z_ERRNO;

    free(state);

    return ret;

}