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/***********************************************************************/
/* */
/* The CamlZip library */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 2001 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Lesser General Public License, with */
/* the special exception on linking described in file LICENSE. */
/* */
/***********************************************************************/
/* $Id$ */
/* Stub code to interface with Zlib */
#include <stdint.h>
#include <zlib.h>
#include <caml/mlvalues.h>
#include <caml/alloc.h>
#include <caml/callback.h>
#include <caml/fail.h>
#include <caml/memory.h>
#include <caml/custom.h>
#define ZStream_val(v) (*((z_streamp *) Data_custom_val(v)))
static const value * camlzip_error_exn = NULL;
static void camlzip_error(char * fn, value vzs)
{
char * msg;
value s1 = Val_unit, s2 = Val_unit, bucket = Val_unit;
msg = ZStream_val(vzs)->msg;
if (msg == NULL) msg = "";
if (camlzip_error_exn == NULL) {
camlzip_error_exn = caml_named_value("Zlib.Error");
if (camlzip_error_exn == NULL)
caml_invalid_argument("Exception Zlib.Error not initialized");
}
Begin_roots3(s1, s2, bucket);
s1 = caml_copy_string(fn);
s2 = caml_copy_string(msg);
bucket = caml_alloc_small(3, 0);
Field(bucket, 0) = *camlzip_error_exn;
Field(bucket, 1) = s1;
Field(bucket, 2) = s2;
End_roots();
caml_raise(bucket);
}
static void camlzip_free_dstream(value vzs)
{
deflateEnd(ZStream_val(vzs));
caml_stat_free(ZStream_val(vzs));
ZStream_val(vzs) = NULL;
}
static struct custom_operations camlzip_dstream_ops = {
"camlzip_dstream_ops", &camlzip_free_dstream, NULL, NULL, NULL, NULL
};
value camlzip_deflateInit(value vlevel, value expect_header)
{
value vzs =
caml_alloc_custom_mem(&camlzip_dstream_ops,
sizeof(z_streamp), sizeof(z_stream));
ZStream_val(vzs) = caml_stat_alloc(sizeof(z_stream));
/* Zlib API: the fields zalloc, zfree and opaque must be initialized */
ZStream_val(vzs)->zalloc = NULL;
ZStream_val(vzs)->zfree = NULL;
ZStream_val(vzs)->opaque = NULL;
if (deflateInit2(ZStream_val(vzs),
Int_val(vlevel),
Z_DEFLATED,
Bool_val(expect_header) ? MAX_WBITS : -MAX_WBITS,
8,
Z_DEFAULT_STRATEGY) != Z_OK)
camlzip_error("Zlib.deflateInit", vzs);
return vzs;
}
static int camlzip_flush_table[] =
{ Z_NO_FLUSH, Z_SYNC_FLUSH, Z_FULL_FLUSH, Z_FINISH };
value camlzip_deflate(value vzs, value srcbuf, value srcpos, value srclen,
value dstbuf, value dstpos, value dstlen,
value vflush)
{
z_stream * zs = ZStream_val(vzs);
int retcode;
long used_in, used_out;
value res;
zs->next_in = &Byte_u(srcbuf, Long_val(srcpos));
zs->avail_in = Long_val(srclen);
zs->next_out = &Byte_u(dstbuf, Long_val(dstpos));
zs->avail_out = Long_val(dstlen);
retcode = deflate(zs, camlzip_flush_table[Int_val(vflush)]);
if (retcode < 0 && retcode != Z_BUF_ERROR) camlzip_error("Zlib.deflate", vzs);
used_in = Long_val(srclen) - zs->avail_in;
used_out = Long_val(dstlen) - zs->avail_out;
zs->next_in = NULL; /* not required, but cleaner */
zs->next_out = NULL; /* (avoid dangling pointers into Caml heap) */
res = caml_alloc_small(3, 0);
Field(res, 0) = Val_bool(retcode == Z_STREAM_END);
Field(res, 1) = Val_int(used_in);
Field(res, 2) = Val_int(used_out);
return res;
}
value camlzip_deflate_bytecode(value * arg, int nargs)
{
return camlzip_deflate(arg[0], arg[1], arg[2], arg[3],
arg[4], arg[5], arg[6], arg[7]);
}
value camlzip_deflateEnd(value vzs)
{
if (deflateEnd(ZStream_val(vzs)) != Z_OK)
camlzip_error("Zlib.deflateEnd", vzs);
return Val_unit;
}
static void camlzip_free_istream(value vzs)
{
inflateEnd(ZStream_val(vzs));
caml_stat_free(ZStream_val(vzs));
ZStream_val(vzs) = NULL;
}
static struct custom_operations camlzip_istream_ops = {
"camlzip_dstream_ops", &camlzip_free_istream, NULL, NULL, NULL, NULL
};
value camlzip_inflateInit(value expect_header)
{
value vzs =
caml_alloc_custom_mem(&camlzip_istream_ops,
sizeof(z_streamp), sizeof(z_stream));
/* Zlib API: The fields next_in, avail_in, zalloc, zfree and opaque
must be initialized */
ZStream_val(vzs) = caml_stat_alloc(sizeof(z_stream));
ZStream_val(vzs)->zalloc = NULL;
ZStream_val(vzs)->zfree = NULL;
ZStream_val(vzs)->opaque = NULL;
ZStream_val(vzs)->next_in = NULL;
ZStream_val(vzs)->avail_in = 0;
if (inflateInit2(ZStream_val(vzs),
Bool_val(expect_header) ? MAX_WBITS : -MAX_WBITS) != Z_OK)
camlzip_error("Zlib.inflateInit", vzs);
return vzs;
}
value camlzip_inflate(value vzs, value srcbuf, value srcpos, value srclen,
value dstbuf, value dstpos, value dstlen,
value vflush)
{
z_stream * zs = ZStream_val(vzs);
int retcode;
long used_in, used_out;
value res;
zs->next_in = &Byte_u(srcbuf, Long_val(srcpos));
zs->avail_in = Long_val(srclen);
zs->next_out = &Byte_u(dstbuf, Long_val(dstpos));
zs->avail_out = Long_val(dstlen);
retcode = inflate(zs, camlzip_flush_table[Int_val(vflush)]);
if ((retcode < 0 && retcode != Z_BUF_ERROR) || retcode == Z_NEED_DICT)
camlzip_error("Zlib.inflate", vzs);
used_in = Long_val(srclen) - zs->avail_in;
used_out = Long_val(dstlen) - zs->avail_out;
zs->next_in = NULL; /* not required, but cleaner */
zs->next_out = NULL; /* (avoid dangling pointers into Caml heap) */
res = caml_alloc_small(3, 0);
Field(res, 0) = Val_bool(retcode == Z_STREAM_END);
Field(res, 1) = Val_int(used_in);
Field(res, 2) = Val_int(used_out);
return res;
}
value camlzip_inflate_bytecode(value * arg, int nargs)
{
return camlzip_inflate(arg[0], arg[1], arg[2], arg[3],
arg[4], arg[5], arg[6], arg[7]);
}
value camlzip_inflateEnd(value vzs)
{
if (inflateEnd(ZStream_val(vzs)) != Z_OK)
camlzip_error("Zlib.inflateEnd", vzs);
return Val_unit;
}
value camlzip_update_crc32(value crc, value buf, value pos, value len)
{
return caml_copy_int32(crc32((uint32_t) Int32_val(crc),
&Byte_u(buf, Long_val(pos)),
Long_val(len)));
}
value camlzip_uncompress(value dest, value destlen, value src, value srclen)
{
unsigned long destlenc = Int_val(destlen);
unsigned long srclenc = Int_val(srclen);
int status;
status = uncompress (String_val(dest), &destlenc, String_val(src), srclenc);
if (status == Z_OK) return Val_true;
else return Val_false;
}
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