Add fz_deflate family of functions.

This gives us a friendlier interface to zlib.

Simplifies PNG output and PCLM output code.

1 files changed, 50 insertions, 0 deletions

diff --git a/include/mupdf/fitz/compress.h b/include/mupdf/fitz/compress.h
new file mode 100644
index 00000000..cfd4ed1a
--- /dev/null
+++ b/include/mupdf/fitz/compress.h
@@ -0,0 +1,50 @@
+#ifndef MUPDF_FITZ_COMPRESS_H
+#define MUPDF_FITZ_COMPRESS_H
+
+#include "mupdf/fitz/system.h"
+
+typedef enum
+{
+	FZ_DEFLATE_NONE = 0,
+	FZ_DEFLATE_BEST_SPEED = 1,
+	FZ_DEFLATE_BEST = 9,
+	FZ_DEFLATE_DEFAULT = -1
+} fz_deflate_level;
+
+/*
+	fz_deflate_bound: Returns the upper bound on the
+	size of flated data of length size.
+ */
+size_t fz_deflate_bound(fz_context *ctx, size_t size);
+
+/*
+	fz_deflate: Compress source_length bytes of data starting
+	at source, into a buffer of length *destLen, starting at dest.
+	*compressed_length will be updated on exit to contain the size
+	actually used.
+ */
+void fz_deflate(fz_context *ctx, unsigned char *dest, size_t *compressed_length, const unsigned char *source, size_t source_length, fz_deflate_level level);
+
+/*
+	fz_new_deflated_data: Compress source_length bytes of data starting
+	at source, into a new memory block malloced for that purpose.
+	*compressed_length is updated on exit to contain the size used.
+	Ownership of the block is returned from this function, and the
+	caller is therefore responsible for freeing it. The block may be
+	considerably larger than is actually required. The caller is
+	free to fz_realloc it down if it wants to.
+*/
+unsigned char *fz_new_deflated_data(fz_context *ctx, size_t *compressed_length, const unsigned char *source, size_t source_length, fz_deflate_level level);
+
+/*
+	fz_new_deflated_data_from_buffer: Compress the contents of a fz_buffer into a
+	new block malloced for that purpose. *compressed_length is updated
+	on exit to contain the size used. Ownership of the block is
+	returned from this function, and the caller is therefore responsible
+	for freeing it. The block may be considerably larger than is
+	actually required. The caller is free to fz_realloc it down if it
+	wants to.
+*/
+unsigned char *fz_new_deflated_data_from_buffer(fz_context *ctx, size_t *compressed_length, fz_buffer *buffer, fz_deflate_level level);
+
+#endif