SkPDF/Deflate: clean up old SkFlate code

Factor out some of https://crrev.com/1227913008

BUG=skia:3030

Review URL: https://codereview.chromium.org/1298243002

1 files changed, 2 insertions, 107 deletions

diff --git a/src/pdf/SkDeflate.cpp b/src/pdf/SkDeflate.cpp
index 0953ef27fb..2ca516c0e3 100644
--- a/src/pdf/SkDeflate.cpp
+++ b/src/pdf/SkDeflate.cpp
@@ -19,120 +19,15 @@ namespace {
     #include "zlib.h"
 #endif
 
-// static
-const size_t kBufferSize = 1024;
-
 // Different zlib implementations use different T.
 // We've seen size_t and unsigned.
 template <typename T> void* skia_alloc_func(void*, T items, T size) {
     return sk_calloc_throw(SkToSizeT(items) * SkToSizeT(size));
 }
 
-static void skia_free_func(void*, void* address) { sk_free(address); }
-
-bool doFlate(bool compress, SkStream* src, SkWStream* dst) {
-    uint8_t inputBuffer[kBufferSize];
-    uint8_t outputBuffer[kBufferSize];
-    z_stream flateData;
-    flateData.zalloc = &skia_alloc_func;
-    flateData.zfree = &skia_free_func;
-    flateData.opaque = NULL;
-    flateData.next_in = NULL;
-    flateData.avail_in = 0;
-    flateData.next_out = outputBuffer;
-    flateData.avail_out = kBufferSize;
-    int rc;
-    if (compress)
-        rc = deflateInit(&flateData, Z_DEFAULT_COMPRESSION);
-    else
-        rc = inflateInit(&flateData);
-    if (rc != Z_OK)
-        return false;
-
-    uint8_t* input = (uint8_t*)src->getMemoryBase();
-    size_t inputLength = src->getLength();
-    if (input == NULL || inputLength == 0) {
-        input = NULL;
-        flateData.next_in = inputBuffer;
-        flateData.avail_in = 0;
-    } else {
-        flateData.next_in = input;
-        flateData.avail_in = SkToUInt(inputLength);
-    }
-
-    rc = Z_OK;
-    while (true) {
-        if (flateData.avail_out < kBufferSize) {
-            if (!dst->write(outputBuffer, kBufferSize - flateData.avail_out)) {
-                rc = Z_BUF_ERROR;
-                break;
-            }
-            flateData.next_out = outputBuffer;
-            flateData.avail_out = kBufferSize;
-        }
-        if (rc != Z_OK)
-            break;
-        if (flateData.avail_in == 0) {
-            if (input != NULL)
-                break;
-            size_t read = src->read(&inputBuffer, kBufferSize);
-            if (read == 0)
-                break;
-            flateData.next_in = inputBuffer;
-            flateData.avail_in = SkToUInt(read);
-        }
-        if (compress)
-            rc = deflate(&flateData, Z_NO_FLUSH);
-        else
-            rc = inflate(&flateData, Z_NO_FLUSH);
-    }
-    while (rc == Z_OK) {
-        if (compress)
-            rc = deflate(&flateData, Z_FINISH);
-        else
-            rc = inflate(&flateData, Z_FINISH);
-        if (flateData.avail_out < kBufferSize) {
-            if (!dst->write(outputBuffer, kBufferSize - flateData.avail_out))
-                return false;
-            flateData.next_out = outputBuffer;
-            flateData.avail_out = kBufferSize;
-        }
-    }
-
-    if (compress)
-        deflateEnd(&flateData);
-    else
-        inflateEnd(&flateData);
-    if (rc == Z_STREAM_END)
-        return true;
-    return false;
-}
-
-}
-
-// static
-bool SkFlate::Deflate(SkStream* src, SkWStream* dst) {
-    return doFlate(true, src, dst);
-}
-
-bool SkFlate::Deflate(const void* ptr, size_t len, SkWStream* dst) {
-    SkMemoryStream stream(ptr, len);
-    return doFlate(true, &stream, dst);
-}
-
-bool SkFlate::Deflate(const SkData* data, SkWStream* dst) {
-    if (data) {
-        SkMemoryStream stream(data->data(), data->size());
-        return doFlate(true, &stream, dst);
-    }
-    return false;
-}
-
-// static
-bool SkFlate::Inflate(SkStream* src, SkWStream* dst) {
-    return doFlate(false, src, dst);
-}
+void skia_free_func(void*, void* address) { sk_free(address); }
 
+}  // namespace
 
 #define SKDEFLATEWSTREAM_INPUT_BUFFER_SIZE 4096
 #define SKDEFLATEWSTREAM_OUTPUT_BUFFER_SIZE 4224  // 4096 + 128, usually big