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

* Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 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));

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

state->size to non-zero. Return -1 on failure or 0 on success. */

local int gz_init(state)

gz_statep state;

{

int ret;

z_streamp strm = &(state->strm);

/* allocate input buffer */

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

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;

}

}

/* 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, 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, got;

unsigned have;

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) {

got = write(state->fd, strm->next_in, strm->avail_in);

if (got < 0 || (unsigned)got != strm->avail_in) {

gz_error(state, Z_ERRNO, zstrerror());

return -1;

}

strm->avail_in = 0;

return 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))) {

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

if (have && ((got = write(state->fd, state->x.next, have)) < 0 ||

(unsigned)got != have)) {

gz_error(state, Z_ERRNO, zstrerror());

return -1;

}

if (strm->avail_out == 0) {

strm->avail_out = state->size;

strm->next_out = state->out;

}

state->x.next = strm->next_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)

deflateReset(strm);

/* all done, no errors */

return 0;

}

/* Compress len zeros to output. Return -1 on error, 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;

}

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

int ZEXPORT gzwrite(file, buf, len)

gzFile file;

voidpc buf;

unsigned len;

{

unsigned put = len;

gz_statep state;

z_streamp strm;

/* get internal structure */

if (file == NULL)

return 0;

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 0;

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

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

if ((int)len < 0) {

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

return 0;

}

/* 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 (strm->avail_in == 0)

strm->next_in = state->in;

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

copy = state->size - have;

if (copy > len)

copy = len;

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

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

return 0;

/* directly compress user buffer to file */

strm->avail_in = len;

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

state->x.pos += len;

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

return 0;

}

/* input was all buffered or compressed (put will fit in int) */

return (int)put;

}

/* -- 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] = c;

strm->avail_in++;

state->x.pos++;

return c & 0xff;

}

}

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

buf[0] = c;

if (gzwrite(file, buf, 1) != 1)

return -1;

return c & 0xff;

}

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

int ZEXPORT gzputs(file, str)

gzFile file;

const char *str;

{

int ret;

unsigned len;

/* write string */

len = (unsigned)strlen(str);

ret = gzwrite(file, str, len);

return ret == 0 && len != 0 ? -1 : ret;

}

#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 size, len;

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 0;

/* make sure we have some buffer space */

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;

}

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

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

return 0;

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

size = (int)(state->size);

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

#ifdef NO_vsnprintf

# ifdef HAS_vsprintf_void

(void)vsprintf((char *)(state->in), format, va);

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

if (state->in[len] == 0) break;

# else

len = vsprintf((char *)(state->in), format, va);

# endif

#else

# ifdef HAS_vsnprintf_void

(void)vsnprintf((char *)(state->in), size, format, va);

len = strlen((char *)(state->in));

# else

len = vsnprintf((char *)(state->in), size, format, va);

# endif

#endif

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

if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)

return 0;

/* update buffer and position, defer compression until needed */

strm->avail_in = (unsigned)len;

strm->next_in = state->in;

state->x.pos += len;

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;

{

int size, len;

gz_statep state;

z_streamp strm;

/* get internal structure */

if (file == NULL)

return -1;

state = (gz_statep)file;

strm = &(state->strm);

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

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

return 0;

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

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

return 0;

/* make sure we have some buffer space */

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;

}

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

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

return 0;

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

size = (int)(state->size);

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

#ifdef NO_snprintf

# ifdef HAS_sprintf_void

sprintf((char *)(state->in), 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 (state->in[len] == 0) break;

# else

len = sprintf((char *)(state->in), 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((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,

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

len = strlen((char *)(state->in));

# else

len = snprintf((char *)(state->in), 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 >= (int)size || state->in[size - 1] != 0)

return 0;

/* update buffer and position, defer compression until needed */

strm->avail_in = (unsigned)len;

strm->next_in = state->in;

state->x.pos += len;

return len;

}

#endif

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

int ZEXPORT gzflush(file, flush)

gzFile file;

int flush;

{

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 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 -1;

}

/* compress remaining data with requested flush */

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 -1;

}

/* 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_PARTIAL_FLUSH) == -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;

}