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#include "fitz-imp.h"
#include <zlib.h>
#if !defined (INT32_MAX)
#define INT32_MAX 2147483647L
#endif
#define ZIP_LOCAL_FILE_SIG 0x04034b50
#define ZIP_CENTRAL_DIRECTORY_SIG 0x02014b50
#define ZIP_END_OF_CENTRAL_DIRECTORY_SIG 0x06054b50
struct fz_zip_writer_s
{
fz_output *output;
fz_buffer *central;
int count;
int closed;
};
void
fz_write_zip_entry(fz_context *ctx, fz_zip_writer *zip, const char *name, fz_buffer *buf, int compress)
{
int offset = fz_tell_output(ctx, zip->output);
int sum;
sum = crc32(0, NULL, 0);
sum = crc32(sum, buf->data, (uInt)buf->len);
fz_append_int32_le(ctx, zip->central, ZIP_CENTRAL_DIRECTORY_SIG);
fz_append_int16_le(ctx, zip->central, 0); /* version made by: MS-DOS */
fz_append_int16_le(ctx, zip->central, 20); /* version to extract: 2.0 */
fz_append_int16_le(ctx, zip->central, 0); /* general purpose bit flag */
fz_append_int16_le(ctx, zip->central, 0); /* compression method: store */
fz_append_int16_le(ctx, zip->central, 0); /* TODO: last mod file time */
fz_append_int16_le(ctx, zip->central, 0); /* TODO: last mod file date */
fz_append_int32_le(ctx, zip->central, sum); /* crc-32 */
fz_append_int32_le(ctx, zip->central, (int)buf->len); /* csize */
fz_append_int32_le(ctx, zip->central, (int)buf->len); /* usize */
fz_append_int16_le(ctx, zip->central, (int)strlen(name)); /* file name length */
fz_append_int16_le(ctx, zip->central, 0); /* extra field length */
fz_append_int16_le(ctx, zip->central, 0); /* file comment length */
fz_append_int16_le(ctx, zip->central, 0); /* disk number start */
fz_append_int16_le(ctx, zip->central, 0); /* internal file attributes */
fz_append_int32_le(ctx, zip->central, 0); /* external file attributes */
fz_append_int32_le(ctx, zip->central, offset); /* relative offset of local header */
fz_append_string(ctx, zip->central, name);
fz_write_int32_le(ctx, zip->output, ZIP_LOCAL_FILE_SIG);
fz_write_int16_le(ctx, zip->output, 20); /* version to extract: 2.0 */
fz_write_int16_le(ctx, zip->output, 0); /* general purpose bit flag */
fz_write_int16_le(ctx, zip->output, 0); /* compression method: store */
fz_write_int16_le(ctx, zip->output, 0); /* TODO: last mod file time */
fz_write_int16_le(ctx, zip->output, 0); /* TODO: last mod file date */
fz_write_int32_le(ctx, zip->output, sum); /* crc-32 */
fz_write_int32_le(ctx, zip->output, (int)buf->len); /* csize */
fz_write_int32_le(ctx, zip->output, (int)buf->len); /* usize */
fz_write_int16_le(ctx, zip->output, (int)strlen(name)); /* file name length */
fz_write_int16_le(ctx, zip->output, 0); /* extra field length */
fz_write_data(ctx, zip->output, name, strlen(name));
fz_write_data(ctx, zip->output, buf->data, buf->len);
++zip->count;
}
void
fz_close_zip_writer(fz_context *ctx, fz_zip_writer *zip)
{
fz_off_t offset = fz_tell_output(ctx, zip->output);
fz_write_data(ctx, zip->output, zip->central->data, zip->central->len);
fz_write_int32_le(ctx, zip->output, ZIP_END_OF_CENTRAL_DIRECTORY_SIG);
fz_write_int16_le(ctx, zip->output, 0); /* number of this disk */
fz_write_int16_le(ctx, zip->output, 0); /* number of disk where central directory starts */
fz_write_int16_le(ctx, zip->output, zip->count); /* entries in central directory in this disk */
fz_write_int16_le(ctx, zip->output, zip->count); /* entries in central directory in total */
fz_write_int32_le(ctx, zip->output, (int)zip->central->len); /* size of the central directory */
fz_write_int32_le(ctx, zip->output, (int)offset); /* offset of the central directory */
fz_write_int16_le(ctx, zip->output, 5); /* zip file comment length */
fz_write_data(ctx, zip->output, "MuPDF", 5);
zip->closed = 1;
}
void
fz_drop_zip_writer(fz_context *ctx, fz_zip_writer *zip)
{
if (!zip)
return;
if (!zip->closed)
fz_warn(ctx, "dropping unclosed zip writer");
fz_drop_output(ctx, zip->output);
fz_drop_buffer(ctx, zip->central);
fz_free(ctx, zip);
}
fz_zip_writer *
fz_new_zip_writer(fz_context *ctx, const char *filename)
{
fz_zip_writer *zip = fz_malloc_struct(ctx, fz_zip_writer);
fz_try(ctx)
{
zip->output = fz_new_output_with_path(ctx, filename, 0);
zip->central = fz_new_buffer(ctx, 0);
}
fz_catch(ctx)
{
fz_drop_output(ctx, zip->output);
fz_drop_buffer(ctx, zip->central);
fz_free(ctx, zip);
fz_rethrow(ctx);
}
return zip;
}
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