Add openMemory method with an example

1 files changed, 130 insertions, 0 deletions

diff --git a/examples/c4ls_buffer.c b/examples/c4ls_buffer.c
new file mode 100644
index 0000000..a021e61
--- /dev/null
+++ b/examples/c4ls_buffer.c
@@ -0,0 +1,130 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <locale.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include "cc4group.h"
+
+const char* formatTime(int32_t time)
+{
+	time_t tTime = time;
+	static char ret[128];
+	strftime(ret, sizeof(ret), "%c", localtime(&tTime));
+	return ret;
+}
+
+const char* formatSize(uint32_t size)
+{
+	static char ret[128];
+	if(size < 1000)
+	{
+		snprintf(ret, 128, "%4ud", size);
+		return ret;
+	}
+
+	static const char prefixes[] = " KMGTPE";
+
+	const char* prefix = prefixes;
+	uint32_t fract = 0;
+
+	while(size >= 1000 && *(prefix + 1) != '\0')
+	{
+		++prefix;
+		fract = size % 1000;
+		size /= 1000;
+	}
+
+	if(size < 10)
+	{
+		snprintf(ret, 128, "%1.1f%c", (float)size + (float)fract / 1000, *prefix);
+	}
+	else
+	{
+		snprintf(ret, 128, "%3u%c", size, *prefix);
+	}
+
+	return ret;
+}
+
+int main(int argc, char* argv[])
+{
+	if(argc > 2)
+	{
+		fprintf(stderr, "USAGE: %s [subgroup]\n", argv[0]);
+		fprintf(stderr, "Reads the group from stdin into memory and then opens it to list its contents (or the contents of a subgroup).\n");
+		return EXIT_FAILURE;
+	}
+
+	size_t size = 1024;
+	uint8_t* buffer = malloc(size);
+	if(buffer == NULL)
+	{
+		fprintf(stderr, "ERROR: Can not allocate memory for the buffer: \"%s\"\n", strerror(errno));
+		return EXIT_FAILURE;
+	}
+
+	size_t pos = 0;
+	for(;;)
+	{
+		ssize_t count = read(STDIN_FILENO, buffer + pos, size - pos);
+		if(count == 0)
+		{
+			break;
+		}
+
+		if(count == -1)
+		{
+			fprintf(stderr, "ERROR: Reading stdin failed: \"%s\"\n", strerror(errno));
+			free(buffer);
+			return EXIT_FAILURE;
+		}
+
+		pos += count;
+
+		if(pos >= size)
+		{
+			buffer = realloc(buffer, size *= 2);
+
+			if(buffer == NULL)
+			{
+				fprintf(stderr, "ERROR: Can not allocate more memory for the buffer: \"%s\"\n", strerror(errno));
+				return EXIT_FAILURE;
+			}
+		}
+	}
+
+	CC4Group* group = cc4group.new();
+	bool success = cc4group.openMemory(group, buffer, pos);
+	free(buffer);
+	if(!success)
+	{
+		fprintf(stderr, "ERROR: Can not open group file from stdin: %s\n", cc4group.getErrorMessage(group));
+	}
+	else
+	{
+		CC4Group_EntryInfo* infos;
+		size_t entries;
+
+		success = cc4group.getEntryInfos(group, argc == 2 ? argv[1] : NULL, &infos, &entries);
+
+		if(!success)
+		{
+			fprintf(stderr, "ERROR: Can not list group entries: %s\n", cc4group.getErrorMessage(group));
+		}
+		else
+		{
+			for(size_t i = 0; i < entries; ++i)
+			{
+				printf("%c %s %s %s\t%s\n", infos[i].directory ? 'd' : infos[i].executable ? 'x' : ' ', formatTime(infos[i].modified), formatSize(infos[i].totalSize), infos[i].fileName, infos[i].author);
+			}
+
+			free(infos);
+		}
+	}
+	cc4group.delete(group);
+
+	return success ? EXIT_SUCCESS : EXIT_FAILURE;
+}