Resource-constrained embedded platforms often exclude full-featured HTTP clients like cURL due to binary size limitations. The libghttp library offers a compact alternative for ARM-based devices requiring cloud storage connectivity.

Compiling the Core Library

Fetch the source repostiory:

git clone https://github.com/sknown/libghttp.git
cd libghttp

Adapt the build configuration for cross-compilation by defining toolchain variables:

TARGET_ARCH = arm-linux-gnueabihf
COMPILER = $(TARGET_ARCH)-gcc
ARCHIVER = $(TARGET_ARCH)-ar

DEFINES = -DGHTTP_MAJOR_VERSION=1 \
          -DGHTTP_MINOR_VERSION=0 \
          -DGHTTP_MICRO_VERSION=9 \
          -DPACKAGE=\"libghttp\" \
          -DVERSION=\"1.0.9\"

CFLAGS = -O2 -fPIC -Wall $(DEFINES)

OBJECTS = http_core.o http_parse.o http_net.o http_util.o \
          http_time.o http_encode.o http_auth.o http_uri.o

STATIC_LIB = libghttp.a
SHARED_LIB = libghttp.so

all: $(STATIC_LIB) $(SHARED_LIB)

$(STATIC_LIB): $(OBJECTS)
	$(ARCHIVER) crs $@ $(OBJECTS)

$(SHARED_LIB): $(OBJECTS)
	$(COMPILER) -shared -o $@ $(OBJECTS)

%.o: %.c
	$(COMPILER) $(CFLAGS) -c $< -o $@

clean:
	rm -f $(OBJECTS) $(STATIC_LIB) $(SHARED_LIB)

Build the libraries:

make

Building the Storage Client

For Qiniu cloud integration, obtain the SDK wrapper:

git clone https://github.com/jemygraw/libghttp-qiniu.git

Create a Makefile referecning your libghttp installation:

ARCH = arm-linux-gnueabihf
CC = $(ARCH)-gcc

GHTTP_DIR = ./libghttp
CFLAGS = -std=c99 -I$(GHTTP_DIR)/include -L$(GHTTP_DIR)/lib
LDFLAGS = -lghttp

SOURCES = sdk/qiniu_client.c app/upload_tool.c
OUTPUT = arm-upload

all:
	$(CC) $(CFLAGS) $(SOURCES) -o $(OUTPUT) $(LDFLAGS)

Compile the upload utility:

make

The output binary executse HTTP POST requests via libghttp, transmitting files to cloud storage endpoints while maintaining a minimal footprint suitable for embedded deployments.