136 lines
4.5 KiB
C
136 lines
4.5 KiB
C
#include "mupdf/fitz.h"
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#include "fitz-imp.h"
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#include <string.h>
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#include <zlib.h>
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#if !defined (INT32_MAX)
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#define INT32_MAX 2147483647L
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#endif
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#define ZIP_LOCAL_FILE_SIG 0x04034b50
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#define ZIP_CENTRAL_DIRECTORY_SIG 0x02014b50
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#define ZIP_END_OF_CENTRAL_DIRECTORY_SIG 0x06054b50
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struct fz_zip_writer_s
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{
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fz_output *output;
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fz_buffer *central;
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int count;
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int closed;
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};
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void
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fz_write_zip_entry(fz_context *ctx, fz_zip_writer *zip, const char *name, fz_buffer *buf, int compress)
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{
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int offset = fz_tell_output(ctx, zip->output);
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int sum;
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sum = crc32(0, NULL, 0);
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sum = crc32(sum, buf->data, (uInt)buf->len);
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fz_append_int32_le(ctx, zip->central, ZIP_CENTRAL_DIRECTORY_SIG);
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fz_append_int16_le(ctx, zip->central, 0); /* version made by: MS-DOS */
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fz_append_int16_le(ctx, zip->central, 20); /* version to extract: 2.0 */
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fz_append_int16_le(ctx, zip->central, 0); /* general purpose bit flag */
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fz_append_int16_le(ctx, zip->central, 0); /* compression method: store */
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fz_append_int16_le(ctx, zip->central, 0); /* TODO: last mod file time */
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fz_append_int16_le(ctx, zip->central, 0); /* TODO: last mod file date */
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fz_append_int32_le(ctx, zip->central, sum); /* crc-32 */
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fz_append_int32_le(ctx, zip->central, (int)buf->len); /* csize */
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fz_append_int32_le(ctx, zip->central, (int)buf->len); /* usize */
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fz_append_int16_le(ctx, zip->central, (int)strlen(name)); /* file name length */
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fz_append_int16_le(ctx, zip->central, 0); /* extra field length */
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fz_append_int16_le(ctx, zip->central, 0); /* file comment length */
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fz_append_int16_le(ctx, zip->central, 0); /* disk number start */
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fz_append_int16_le(ctx, zip->central, 0); /* internal file attributes */
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fz_append_int32_le(ctx, zip->central, 0); /* external file attributes */
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fz_append_int32_le(ctx, zip->central, offset); /* relative offset of local header */
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fz_append_string(ctx, zip->central, name);
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fz_write_int32_le(ctx, zip->output, ZIP_LOCAL_FILE_SIG);
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fz_write_int16_le(ctx, zip->output, 20); /* version to extract: 2.0 */
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fz_write_int16_le(ctx, zip->output, 0); /* general purpose bit flag */
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fz_write_int16_le(ctx, zip->output, 0); /* compression method: store */
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fz_write_int16_le(ctx, zip->output, 0); /* TODO: last mod file time */
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fz_write_int16_le(ctx, zip->output, 0); /* TODO: last mod file date */
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fz_write_int32_le(ctx, zip->output, sum); /* crc-32 */
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fz_write_int32_le(ctx, zip->output, (int)buf->len); /* csize */
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fz_write_int32_le(ctx, zip->output, (int)buf->len); /* usize */
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fz_write_int16_le(ctx, zip->output, (int)strlen(name)); /* file name length */
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fz_write_int16_le(ctx, zip->output, 0); /* extra field length */
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fz_write_data(ctx, zip->output, name, strlen(name));
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fz_write_data(ctx, zip->output, buf->data, buf->len);
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++zip->count;
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}
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void
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fz_close_zip_writer(fz_context *ctx, fz_zip_writer *zip)
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{
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int64_t offset = fz_tell_output(ctx, zip->output);
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fz_write_data(ctx, zip->output, zip->central->data, zip->central->len);
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fz_write_int32_le(ctx, zip->output, ZIP_END_OF_CENTRAL_DIRECTORY_SIG);
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fz_write_int16_le(ctx, zip->output, 0); /* number of this disk */
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fz_write_int16_le(ctx, zip->output, 0); /* number of disk where central directory starts */
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fz_write_int16_le(ctx, zip->output, zip->count); /* entries in central directory in this disk */
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fz_write_int16_le(ctx, zip->output, zip->count); /* entries in central directory in total */
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fz_write_int32_le(ctx, zip->output, (int)zip->central->len); /* size of the central directory */
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fz_write_int32_le(ctx, zip->output, (int)offset); /* offset of the central directory */
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fz_write_int16_le(ctx, zip->output, 5); /* zip file comment length */
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fz_write_data(ctx, zip->output, "MuPDF", 5);
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fz_close_output(ctx, zip->output);
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zip->closed = 1;
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}
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void
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fz_drop_zip_writer(fz_context *ctx, fz_zip_writer *zip)
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{
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if (!zip)
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return;
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if (!zip->closed)
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fz_warn(ctx, "dropping unclosed zip writer");
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fz_drop_output(ctx, zip->output);
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fz_drop_buffer(ctx, zip->central);
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fz_free(ctx, zip);
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}
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fz_zip_writer *
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fz_new_zip_writer_with_output(fz_context *ctx, fz_output *out)
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{
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fz_zip_writer *zip = fz_malloc_struct(ctx, fz_zip_writer);
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fz_try(ctx)
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{
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zip->output = out;
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zip->central = fz_new_buffer(ctx, 0);
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}
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fz_catch(ctx)
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{
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fz_drop_buffer(ctx, zip->central);
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fz_free(ctx, zip);
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fz_rethrow(ctx);
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}
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return zip;
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}
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fz_zip_writer *
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fz_new_zip_writer(fz_context *ctx, const char *filename)
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{
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fz_output *out = fz_new_output_with_path(ctx, filename, 0);
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fz_zip_writer *zip = NULL;
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fz_try(ctx)
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zip = fz_new_zip_writer_with_output(ctx, out);
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fz_catch(ctx)
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{
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fz_drop_output(ctx, out);
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fz_rethrow(ctx);
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}
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return zip;
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}
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