Add base64 string decoder.

2 files changed, 36 insertions, 0 deletions

diff --git a/include/mupdf/fitz/buffer.h b/include/mupdf/fitz/buffer.h
index 28adc46b..2749c32c 100644
--- a/include/mupdf/fitz/buffer.h
+++ b/include/mupdf/fitz/buffer.h
@@ -78,6 +78,11 @@ fz_buffer *fz_new_buffer_from_data(fz_context *ctx, unsigned char *data, int siz
 fz_buffer *fz_new_buffer_from_shared_data(fz_context *ctx, const char *data, int size);
 
 /*
+	fz_new_buffer_from_base64: Create a new buffer with data decoded from a base64 input string.
+*/
+fz_buffer *fz_new_buffer_from_base64(fz_context *ctx, const char *data, int size);
+
+/*
 	fz_resize_buffer: Ensure that a buffer has a given capacity,
 	truncating data if required.
 
diff --git a/source/fitz/buffer.c b/source/fitz/buffer.c
index 6f0e7057..2d6f9932 100644
--- a/source/fitz/buffer.c
+++ b/source/fitz/buffer.c
@@ -57,6 +57,37 @@ fz_new_buffer_from_shared_data(fz_context *ctx, const char *data, int size)
 }
 
 fz_buffer *
+fz_new_buffer_from_base64(fz_context *ctx, const char *data, int size)
+{
+	fz_buffer *buf = fz_new_buffer(ctx, size);
+	const char *end = data + size;
+	const char *s = data;
+	fz_try(ctx)
+	{
+		while (s < end)
+		{
+			int c = *s++;
+			if (c >= 'A' && c <= 'Z')
+				fz_write_buffer_bits(ctx, buf, c - 'A', 6);
+			else if (c >= 'a' && c <= 'z')
+				fz_write_buffer_bits(ctx, buf, c - 'a' + 26, 6);
+			else if (c >= '0' && c <= '9')
+				fz_write_buffer_bits(ctx, buf, c - '0' + 52, 6);
+			else if (c == '+')
+				fz_write_buffer_bits(ctx, buf, 62, 6);
+			else if (c == '/')
+				fz_write_buffer_bits(ctx, buf, 63, 6);
+		}
+	}
+	fz_catch(ctx)
+	{
+		fz_drop_buffer(ctx, buf);
+		fz_rethrow(ctx);
+	}
+	return buf;
+}
+
+fz_buffer *
 fz_keep_buffer(fz_context *ctx, fz_buffer *buf)
 {
 	if (buf)