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# -*- tcl -*-
# Critcl support, absolutely necessary.
package require critcl
# Bail out early if the compile environment is not suitable.
if {![critcl::compiling]} {
error "Unable to build project, no proper compiler found."
}
# Information for the teapot.txt meta data file put into a generated package.
# Free form strings.
critcl::license {Andreas Kupries} {Under a BSD license}
critcl::summary {The second CriTcl-based package}
critcl::description {
This package is the second example of a CriTcl-based package. It contains all the
necessary and conventionally useful pieces for wrapping an external library.
}
critcl::subject {external library usage} example {critcl package}
critcl::subject {wrapping external library}
# Minimal Tcl version the package should load into.
critcl::tcl 8.6
# Locations for headers and shared library of the library to wrap.
# Required only for non-standard locations, i.e. where CC is not searching by default.
critcl::cheaders -I/usr/include
critcl::clibraries -L/usr/lib/x86_64-linux-gnu
critcl::clibraries -lzstd
# Provide non-standard compiler and linker flags
#critcl::cflags -Dsome_define
#critcl::ldflags
# Import library API
critcl::include zstd.h
# ## #### ######### ################ #########################
## (De)compression using Zstd
## Data to (de)compress is passed in and returned as Tcl byte arrays.
critcl::cproc compress {
Tcl_Interp* ip
bytes data
int {level ZSTD_CLEVEL_DEFAULT}
} object0 {
/* critcl_bytes data; (.s, .len, .o) */
Tcl_Obj* error_message;
int max = ZSTD_maxCLevel();
if ((level < 1) || (level > max)) {
error_message = Tcl_ObjPrintf ("level must be integer between 1 and %d", max);
goto err;
}
size_t dest_sz = ZSTD_compressBound (data.len);
void* dest_buf = Tcl_Alloc(dest_sz);
if (!dest_buf) {
error_message = Tcl_NewStringObj ("can't allocate memory to compress data", -1);
goto err;
}
size_t compressed_size = ZSTD_compress (dest_buf, dest_sz,
data.s, data.len,
level);
if (ZSTD_isError (compressed_size)) {
Tcl_Free(dest_buf);
error_message = Tcl_ObjPrintf ("zstd encoding error: %s",
ZSTD_getErrorName (compressed_size));
goto err;
}
Tcl_Obj* compressed = Tcl_NewByteArrayObj (dest_buf, compressed_size);
Tcl_Free (dest_buf);
return compressed;
err:
Tcl_SetObjResult (ip, error_message);
return 0;
}
critcl::cproc decompress {
Tcl_Interp* ip
bytes data
} object0 {
Tcl_Obj* error_message;
size_t dest_sz = ZSTD_getDecompressedSize (data.s, data.len);
if (dest_sz == 0) {
error_message = Tcl_NewStringObj("invalid data", -1);
goto err;
}
void* dest_buf = Tcl_Alloc (dest_sz);
if (!dest_buf) {
error_message = Tcl_NewStringObj("failed to allocate decompression buffer", -1);
goto err;
}
size_t decompressed_size = ZSTD_decompress (dest_buf, dest_sz,
data.s, data.len);
if (decompressed_size != dest_sz) {
Tcl_Free (dest_buf);
error_message = Tcl_ObjPrintf("zstd decoding error: %s",
ZSTD_getErrorName (decompressed_size));
goto err;
}
Tcl_Obj* decompressed = Tcl_NewByteArrayObj (dest_buf, dest_sz);
Tcl_Free (dest_buf);
return decompressed;
err:
Tcl_SetObjResult (ip, error_message);
return 0;
}
# ## #### ######### ################ #########################
# Forcing compilation, link, and loading now.
critcl::msg -nonewline { Building ...}
if {![critcl::load]} {
error "Building and loading the project failed."
}
# Name and version the package. Just like for every kind of Tcl package.
package provide critcl-example 1
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